Page 1 WORKSHOP MANUAL TRACTOR B2050,B2350,B2650,B3150 KiSC issued 03, 2014 A...
Page 2 All illustrations, photographs and specifications contained in this manual are of the newest information available at the time of publication. KUBOTA reserves the right to change all information at any time without notice. Since this manual includes many models, information or illustrations and photographs can show more than one model.
Page 3 INFORMATION KiSC issued 03, 2014 A...
Page 4: Table Of Contents
INFORMATION CONTENTS 1. SAFETY FIRST ..........................I-1 2. SAFETY DECALS .......................... I-4 3. SPECIFICATIONS.......................... I-7 4. TRAVELING SPEEDS........................I-11 5. DIMENSIONS ..........................I-13 KiSC issued 03, 2014 A...
Page 5: Safety First
B2050, B2350, B2650, B3150, WSM INFORMATION 1. SAFETY FIRST SAFETY FIRST • This symbol, the industry's "Safety Alert Symbol", is used throughout this manual and on labels on the machine itself to warn of the possibility of personal injury. Read these instructions carefully. •...
Page 6 B2050, B2350, B2650, B3150, WSM INFORMATION OPERATE SAFELY • Do not use the machine after you consume alcohol or medication or when you are tired. • Put on applicable clothing and safety equipment. • Use applicable tools only. Do not use alternative tools or parts.
Page 7 B2050, B2350, B2650, B3150, WSM INFORMATION KEEP A GOOD AIRFLOW IN THE WORK AREA • If the engine is in operation, make sure that the area has good airflow. Do not operate the engine in a closed area. The exhaust gas contains poisonous carbon monoxide.
Page 8: Safety Decals
B2050, B2350, B2650, B3150, WSM INFORMATION 2. SAFETY DECALS The following safety decals (pictorial safety labels) are installed on the machine. If a decal becomes damaged, illegible or is not on the machine, replace it. The decal part number is listed in the parts list. WSM000001INI0014US0 9Y1210982INI0001US0 KiSC issued 03, 2014 A...
Page 9 B2050, B2350, B2650, B3150, WSM INFORMATION 9Y1210982INI0002US0 KiSC issued 03, 2014 A...
Page 10 B2050, B2350, B2650, B3150, WSM INFORMATION 9Y1210982INI0003US0 CARE OF PICTORIAL SAFETY LABELS 1. Keep pictorial safety labels clean and free from obstructing material. 2. Clean pictorial safety labels with soap and water, dry with a soft cloth. 3. Replace damaged or missing pictorial safety labels with new labels. 4.
Page 11: Specifications
Hose connection type outlet Rear-PTO SAE 1-3/8, 6 splines PTO / Engine 540 min (rpm) / 2400 min (rpm) speed Mid-PTO USA No.5 (KUBOTA 10-tooth) involute spline PTO / Engine 2500 min (rpm) / 2500 min (rpm) speed KiSC issued 03, 2014 A...
Page 12 B2050, B2350, B2650, B3150, WSM INFORMATION Model B2350 B2650 B3150 ROPS The level of protection against hazardous substances *2 Category 1 ROPS 84.5 dB (A) 85.8 dB (A) 85.0 dB (A) CAB/door 81.2 dB (A) 85.0 dB (A) 83.0 dB (A) Noise at the operator's ear *3 closed CAB/door...
Page 13 SAE 1-3/8, 6 splines PTO / Engine 540 min (rpm) / 2400 min (rpm) speed Mid-PTO USA No.5 (KUBOTA 10-tooth) involute spline PTO / Engine 2500 min (rpm) / 2500 min (rpm) speed The level of protection against hazardous substances *2 Noise at the operator's ear *3 83.5 dB (A)
Page 14 B2050, B2350, B2650, B3150, WSM INFORMATION Model B2050 B2350 B2650 Light driver 1.13 m/s GRAMMER MSG 83/511 Heavy driver 1.00 m/s Light driver 1.21 m/s GRAMMER MSG 93/511 Heavy driver 1.05 m/s Value of the Light driver 1.06 m/s vibration level SEARS 807 Heavy driver 1.24 m/s...
Page 15: Traveling Speeds
B2050, B2350, B2650, B3150, WSM INFORMATION 4. TRAVELING SPEEDS [ROPS and CAB HST Type] (At rated engine rpm) Model B2350 / B2650 31 × 13.5-15 315/75D-15 Tire size (Rear) 8-16 Farm 9.5-16 Farm 9.5-18 Farm Turf Turf Range gear shift km/h (mile/h) lever 0 to 4.61...
Page 16 B2050, B2350, B2650, B3150, WSM INFORMATION [ROPS Manual Transmission Type] (At rated engine rpm) Model B2050 / B2350 / B2650 31 × 13.5-15 315/75D-15 Tire size (Rear) 8-16 Farm 9.5-16 Farm 9.5-18 Farm Turf Turf Range gear shift km/h (mile/h) lever 1.03 (0.640) 1.10 (0.684)
Page 17: Dimensions
B2050, B2350, B2650, B3150, WSM INFORMATION 5. DIMENSIONS Center ROPS 9Y1210982INI0007US0 I-13 KiSC issued 03, 2014 A...
Page 18 B2050, B2350, B2650, B3150, WSM INFORMATION ROPS 9Y1210982INI0008US0 I-14 KiSC issued 03, 2014 A...
Page 19 B2050, B2350, B2650, B3150, WSM INFORMATION CABIN 9Y1210982INI0009US0 I-15 KiSC issued 03, 2014 A...
Page 20 GENERAL KiSC issued 03, 2014 A...
Page 21 GENERAL CONTENTS 1. TRACTOR IDENTIFICATION....................... G-1 2. GENERAL PRECAUTIONS......................G-2 3. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING ........G-3 [1] WIRING ..........................G-3 [2] BATTERY ..........................G-5 [3] FUSE ............................G-5 [4] CONNECTOR ........................G-5 [5] HANDLING OF CIRCUIT TESTER ..................G-6 [6] COLOR OF WIRING ......................
Page 22: Tractor Identification
B2050, B2350, B2650, B3150, WSM GENERAL 1. TRACTOR IDENTIFICATION When contacting your local KUBOTA distributor, always specify engine serial number, tractor serial number and hour meter reading. (1) Tractor Identification Plate (4) ROPS Identification Plate (2) Tractor Serial Number (ROPS Serial Number)
Page 23: General Precautions
• When it is necessary to use special tools, use KUBOTA special tools. Refer to the drawings when you make special tools that you do not use frequently.
Page 24: Handling Precautions For Electrical Parts And Wiring
B2050, B2350, B2650, B3150, WSM GENERAL 3. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING To ensure safety and prevent damage to the machine and surrounding equipment, obey the following precautions in handling electrical parts and wiring. IMPORTANT • Check electrical wiring for damage and loosened connection every year.
Page 25 B2050, B2350, B2650, B3150, WSM GENERAL • Securely insert grommet. (1) Grommet (A) Correct (B) Incorrect WSM000001GEG0066US0 • Securely clamp, being careful not to damage wiring. (1) Clamp (3) Clamp (Wind Clamp Spirally) (4) Welding Dent (2) Wire Harness WSM000001GEG0067US0 •...
Page 26: Battery
B2050, B2350, B2650, B3150, WSM GENERAL [2] BATTERY • Be careful not to confuse positive and negative terminal posts. • When you remove battery cables, disconnect negative cable first. When you install battery cables, check for polarity and connect positive cable first. •...
Page 27: Handling Of Circuit Tester
B2050, B2350, B2650, B3150, WSM GENERAL • Use sandpaper to remove rust from terminals. • Repair deformed terminal. Make sure that there is no terminal being exposed or displaced. (1) Exposed Terminal (3) Sandpaper (2) Deformed Terminal (4) Rust WSM000001GEG0075US0 •...
Page 28: Color Of Wiring
B2050, B2350, B2650, B3150, WSM GENERAL [6] COLOR OF WIRING • Colors of wire are specified to the color codes. • This symbol of "/" shows color with stripe(s). (An example) Red stripe on white color: W/R Color of wiring Color code Black Brown...
Page 29: Lubricants, Fuel And Coolant
Brake pedal overflows NLGI-2 or Clutch pedal 1 [Manual Transmission Type] NLGI-1 (GC-LB) Parking brake Battery Moderate terminal amount NOTE • *KUBOTA UDT or SUPER UDT fluid --- KUBOTA original transmission hydraulic fluid 9Y1210982GEG0002US0 KiSC issued 03, 2014 A...
Page 30 • The oil used to lubricate the transmission is also used as hydraulic fluid. To insure proper operation of the hydraulic system and to complete lubrication of the transmission, it is important that a multi-grade transmission fluid is used in this system. We recommend the use of KUBOTA UDT or SUPER UDT fluid for optimum protection and performance.
Page 31: Tightening Torques
B2050, B2350, B2650, B3150, WSM GENERAL 5. TIGHTENING TORQUES [1] GENERAL USE SCREWS, BOLTS AND NUTS Tighten screws, bolts and nuts whose tightening torques are not specified in this Workshop Manual according to the table below. Indication on top of bolt No-grade or 4T Indication on top of nut No-grade or 4T...
Page 32: Metric Screws, Bolts And Nuts
B2050, B2350, B2650, B3150, WSM GENERAL [3] METRIC SCREWS, BOLTS AND NUTS Grade Property class 8.8 Property class 10.9 Unit N·m kgf·m lbf·ft N·m kgf·m lbf·ft 24 to 27 2.4 to 2.8 18 to 20 30 to 34 3.0 to 3.5 22 to 25 48 to 55 4.9 to 5.7...
Page 33: Maintenance Check List
B2050, B2350, B2650, B3150, WSM GENERAL 6. MAINTENANCE CHECK LIST Indication on hour meter Refer- Item Interval ence 50 100 150 200 250 300 350 400 450 500 550 600 650 700 800 page Clogging of air conditioner Clean Daily G-16 condenser screen [CAB only] every...
Page 34 B2050, B2350, B2650, B3150, WSM GENERAL Indication on hour meter Refer- Item Interval ence 50 100 150 200 250 300 350 400 450 500 550 600 650 700 800 page every Check G-31     200 Hr 25 Radiator hose and clamp every 2 G-31, Replace...
Page 35: Check And Maintenance
B2050, B2350, B2650, B3150, WSM GENERAL 7. CHECK AND MAINTENANCE [1] DAILY CHECK WARNING To avoid personal injury or death: Take the following precautions when checking the tractor. • Park the machine on firm and level ground. • Set the parking brake. •...
Page 36 B2050, B2350, B2650, B3150, WSM GENERAL Checking Engine Oil Level CAUTION To avoid personal injury: • Be sure to stop the engine before checking the oil level. 1. Park the machine on a flat surface. 2. Check engine oil before starting the engine or 5 minutes or more after the engine has stopped.
Page 37 B2050, B2350, B2650, B3150, WSM GENERAL Cleaning Evacuator Valve 1. Open the evacuator valve to get rid of large particles of dust and dirt. (1) Evacuator Valve 9Y1210982GEG0011US0 Cleaning Air Conditioner Condenser Screen [CABIN] WARNING To avoid personal injury or death: •...
Page 38 B2050, B2350, B2650, B3150, WSM GENERAL Checking Head Light, Hazard Light etc. 1. Inspect the light for broken bulbs and lenses. 2. Replace if broken. 9Y1210982GEG0016US0 Checking Seat Belt and ROPS 1. Always check condition of seat belt and ROPS attaching hardware before operating tractor.
Page 39: Check Points Of Every 50 Hours
B2050, B2350, B2650, B3150, WSM GENERAL Checking Movable Parts 1. If any of the movable parts, such as levers and pedals, is not smoothly moved because of rust or anything sticky, do not attempt to force it into motion. In the above case, remove the rust or sticky thing, and apply oil lor grease on the relevant spot.
Page 40 B2050, B2350, B2650, B3150, WSM GENERAL Checking Engine Start System [ROPS and CAB HST Type] WARNING To avoid personal injury or death: • Do not allow anyone near the tractor while testing. • If the tractor does not pass the test do not operate the tractor.
Page 41 B2050, B2350, B2650, B3150, WSM GENERAL Lubricating Grease Fittings 1. Apply a small amount of multipurpose grease to the following points every 50 hours: If you operated the machine in extremely wet and muddy conditions, lubricate grease fittings more often. (1) Grease Fitting (Parking Brake) [A] All Type (2) Grease Fitting (Top Link)
Page 42 B2050, B2350, B2650, B3150, WSM GENERAL Checking Wheel Mounting Nuts Tightening Torque WARNING To avoid personal injury or death: • Never operate tractor with a loose rim, wheel or axle. • Any time bolts and nuts are loosened, retighten to specified torque.
Page 43: Check Points Of Every 100 Hours
B2050, B2350, B2650, B3150, WSM GENERAL [3] CHECK POINTS OF EVERY 100 HOURS Checking Battery Condition DANGER To avoid the possibility or battery explosion: For the refillable type battery, follow the instructions below. • Do not use or charge the refillable type battery if the fluid level is below the LOWER (lower limit level) mark.
Page 44 B2050, B2350, B2650, B3150, WSM GENERAL Battery Charging WARNING To avoid personal injury or death: • When the battery is being activated, hydrogen and oxygen gases in the battery are extremely explosive. Keep open sparks and flames away from the battery at all times, especially when charging the battery.
Page 45 B2050, B2350, B2650, B3150, WSM GENERAL Cleaning Air Cleaner Element [Single Element Type] 1. Remove the element. 2. Clean the element: a) When dry dust adheres to the element, blow compressed air from the inside, turning the element. Pressure of compressed air must be under 205 kPa (2.1 kgf/cm 30 psi).
Page 46 B2050, B2350, B2650, B3150, WSM GENERAL Cleaning Air Cleaner Primary Element [Double Element Type] 1. Remove the air cleaner cover and primary element. 2. Clean the primary element: a) When dry dust adheres to the element, blow compressed air from the inside, turning the element. Pressure of compressed air must be under 205 kPa (2.1 kgf/cm 30 psi).
Page 47 B2050, B2350, B2650, B3150, WSM GENERAL Cleaning Fuel Filter WARNING To avoid personal injury or death: • Stop the engine and remove the key before checking fuel lines and fuel filter. • Check the fuel lines periodically. The fuel lines are subject to wear and aging.
Page 48 B2050, B2350, B2650, B3150, WSM GENERAL Adjusting Brake Pedal WARNING To avoid personal injury or death: • Stop the engine and chock the wheels before checking brake pedal. • Be sure that the difference is 5 mm (0.2 in.) or less, when the right and left brake pedals are depressed.
Page 49 B2050, B2350, B2650, B3150, WSM GENERAL Adjusting Clutch Pedal [ROPS Manual Transmission Type] 1. Stop the engine and remove the key. 2. Slightly depress the clutch pedal and measure free travel at the top of pedal stroke. 3. If adjustment is needed, loosen the lock nut and turn the clutch rod to adjust the rod length within acceptable limits.
Page 50: Check Points Of Every 200 Hours
Then, replenish the engine oil up to the prescribed level. IMPORTANT • To prevent serious damage to the engine, use only a KUBOTA genuine filter. (1) Engine Oil Filter 9Y1210982GEG0036US0 Changing Engine Oil WARNING To avoid personal injury or death: •...
Page 51 IMPORTANT • To prevent serious damage to the hydraulic system, use only a KUBOTA genuine filter. • Do not operate the tractor immediately after changing the transmission fluid. Run the engine at medium speed for a few minutes to prevent damage to the transmission.
Page 52 B2050, B2350, B2650, B3150, WSM GENERAL Checking Radiator Hose and Hose Clamp Check to see if radiator hoses are properly fixed every 200 hours of operation or six months, whichever comes first. 1. If hose clamps are loose or water leaks, tighten bands securely. 2.
Page 53 B2050, B2350, B2650, B3150, WSM GENERAL Checking Power Steering Line 1. Check to see that all lines and hose clamps are tight and not damaged. 2. If hoses and clamps are found worn or damaged, replace or repair them at once. (1) Power Steering Pressure Hoses 9Y1210982GEG0042US0 Adjusting Air Conditioner Belt Tension...
Page 54 B2050, B2350, B2650, B3150, WSM GENERAL Cleaning Air Filter [CABIN HST Type]  Fresh Air Filter 1. Remove the knob bolts (3) and pull out the fresh air filter (1). 2. Blow air from the opposite direction to the filter's normal air flow. Pressure of compressed air must be under 205 kPa (2.1 kgf/cm , 30 psi).
Page 55: Check Points Of Every 400 Hours
2. After draining reinstall the drain plug. 3. Fill with new KUBOTA SUPER UDT fluid up to the upper notch on the dipstick. 4. After running the engine for a few minutes, stop it and check the oil level again;...
Page 56 8. Make sure that the transmission fluid does not leak past the seal on the filter. IMPORTANT • To prevent serious damage to the hydraulic system, use only a KUBOTA genuine filter. (1) Drain Plug Oil level is acceptable within this (2) Drain Plug (Both Sides) range.
Page 57: Check Point Of Every 800 Hours
• See page G-25. IMPORTANT • To prevent serious damage to the engine, use only a KUBOTA genuine filter. 9Y1210982GEG0056US0 Checking the Air Conditioner Pipe and Hose [CABIN] 1. Check to see that all lines and hose clamps are tight and not damaged.
Page 58: Check Points Of Every 2 Years
B2050, B2350, B2650, B3150, WSM GENERAL [10] CHECK POINTS OF EVERY 2 YEARS Flushing Cooling System and Changing Coolant WARNING To avoid personal injury or death: • Do not remove radiator cap while coolant is hot. When cool, slowly rotate cap to the first stop and allow sufficient time for excess pressure to escape before removing the cap completely.
Page 59 • Also, observe the relevant environmental protection regulations when disposing of antifreeze. Always use a 50/50 mix of long-life coolant and clean soft water in KUBOTA engines. 1. Long-life coolant (hereafter LLC) comes in several types. Use ethylene glycol (EG) type for this engine.
Page 60: Others
The LLC contains anticorrosive agent. If mixed with the cleaning agent, sludge may build up, adversely affecting the engine parts. 7. Kubota's genuine long-life coolant has a service life of 2 years. Be sure to change the coolant every 2 years. NOTE •...
Page 61 B2050, B2350, B2650, B3150, WSM GENERAL Replacing Fuse 1. The tractor electrical system is protected from potential damage by fuses. A blown fuse indicates that there is an overload or short somewhere in the electrical system. 2. If any of the fuses should blow, replace with a new one of the same capacity.
Page 62 B2050, B2350, B2650, B3150, WSM GENERAL Replacing Light Bulb 1. Head lights: Take the bulb out of the light body and replace with a new one. 2. Other lights: Detach the lens and replace the bulb. Capacity Light ROPS Head light 35 W Tail light / Brake stop light 5 W / 21 W...
Page 63 B2050, B2350, B2650, B3150, WSM GENERAL Checking Amount of Refrigerant (Gas) [CABIN] WARNING To avoid personal injury: • Liquid contact with eyes or skin may cause frostbite. • In the event of a leakage, wear safety goggles. Escaping refrigerant can cause severe injuries to eyes. •...
Page 64: Special Tools
B2050, B2350, B2650, B3150, WSM GENERAL 8. SPECIAL TOOLS [1] SPECIAL TOOLS FOR ENGINE Special Use Puller Set Code No. • 07916-09032 Application • Use exclusively to pull out bearing, gears and other parts with ease. WSM000001GEG0011US0 Piston Ring Compressor Code No.
Page 65 B2050, B2350, B2650, B3150, WSM GENERAL Diesel Engine Compression Tester (for Injection Nozzle) Code No. • 07909-30208 (Assembly) • 07909-30934 (A to F) • 07909-31211 (E and F) • 07909-31231 (H) • 07909-31251 (G) • 07909-31271 (I) • 07909-31281 (J) Application •...
Page 66 B2050, B2350, B2650, B3150, WSM GENERAL Connecting Rod Alignment Tool Code No. • 07909-31661 Application • Use to check the connecting rod alignment. Applicable range • Connecting rod big end I.D. 30 to 75 mm dia. (1.2 to 2.9 in. dia.) •...
Page 67 B2050, B2350, B2650, B3150, WSM GENERAL NOTE • The following special tools are not provided, so make them referring to the figure. WSM000001GEG0026US0 Valve Guide Replacing Tool Application • Use to press out and press fit the valve guide. NOTE •...
Page 68 B2050, B2350, B2650, B3150, WSM GENERAL Injection Pump Pressure Tester Application • Use to check fuel tightness of injection pumps. NOTE • The following special tools are not provided, so make them referring to the figure. Pressure gauge full scale: More than 29.4 MPa (300 kgf/cm , 4267 psi) Copper gasket...
Page 69 B2050, B2350, B2650, B3150, WSM GENERAL Crankshaft Bearing 1 Replacing Tool Application • Use to press out and press fit the crankshaft bearing 1. NOTE • The following special tools are not provided, so make them referring to the figure. [Extracting tool] 135 mm (5.31 in.) 72 mm (2.8 in.)
Page 70 B2050, B2350, B2650, B3150, WSM GENERAL Socket Application • Use to loosen and tighten the idle gear 2 bearing lock nut. NOTE • The following special tools are not provided, so make them referring to the figure. 28.5 to 28.8 mm (1.12 to 1.13 in.) 3.5 to 3.7 mm (0.14 to 0.15 in.) 28.5 to 28.8 mm (0.12 to 1.13 in.) 38 mm dia.
Page 71: Special Tools For Tractor
B2050, B2350, B2650, B3150, WSM GENERAL [2] SPECIAL TOOLS FOR TRACTOR Tie-rod End Lifter Code No. • 07909-39051 Application • Use to remove the tie-rod end with ease. WSM000001GEG0029US0 Toe-in Gauge Code No. • 07909-31681 Application • This allows easy measurement of toe-in for all machine models. WSM000001GEG0034US0 Relief Valve Pressure Tester Code No.
Page 72 B2050, B2350, B2650, B3150, WSM GENERAL Injector CH3 Code No. • 07916-52501 Application • Use to put calcium chloride solution into a rear wheel and to remove it. WSM000001GEG0031US0 PTO Shift Arm Ball Guide Application • Use for compressing the ball and spring into the transmission case.
Page 73 B2050, B2350, B2650, B3150, WSM GENERAL Check and High Pressure Relief Valve Assembly Tool Application • Use for Readjusting relief valve pressure. 30.0 mm (1.18 in.) Chamfer 0.4 mm (0.12 in.) 1.05 rad (60.0 °) 21.0 mm (0.827 in.) Chamfer 3.0 mm (0.12 in.) Chamfer 0.3 mm (0.01 in.) 1 mm (0.04 in.) Chamfer 2.0 mm (0.079 in.)
Page 74: Special Tools For Cabin
B2050, B2350, B2650, B3150, WSM GENERAL [3] SPECIAL TOOLS FOR CABIN Air Conditioner Service Tool Code No. • DENSO 95048-00063 Application • Use for charge, test or discharge of the air conditioning system. (1) Manifold Gauge Assembly (95048-10090) (2) Charging Hose (Red: HI) (95948-10270) (3) Charging Hose (Blue: LO) (95948-10280) (4) Charging Hose (Green) (95948-10260) (5) Can Tap Valve (95048-10150)
Page 75 B2050, B2350, B2650, B3150, WSM GENERAL Stopper Magnet Clutch (For A/C Compressor) Application • Use for loosen and tighten the magnet clutch mounting nut. NOTE • This special tool is not provided, so make it referring to the figure. 125 mm (4.92 in.) 4.52 rad (120 °) 40 mm dia.
Page 76 B2050, B2350, B2650, B3150, WSM GENERAL Remover Magnet Clutch (for A/C Compressor) Application • Use to remove the hub plate or center piece. NOTE • This special tool is not provided, so make it referring to the figure. 12 mm (0.47 in.) 55 mm (2.16 in.) 20 mm (0.79 in.) 5 mm dia.
Page 77: Tires
IMPORTANT • Do not use tires other than those approved by KUBOTA. Though the tire pressure is factory-set to the prescribed level, it naturally drops slowly in the course of time. Thus, check it everyday and inflate as necessary.
Page 78: Wheel Adjustment
B2050, B2350, B2650, B3150, WSM GENERAL [2] WHEEL ADJUSTMENT WARNING To avoid personal injury or death: • When working on slopes or when working with trailer, set the wheel tread as wide as practical for maximum stability. • Support tractor securely on stands before removing a wheel. •...
Page 79: Rear Wheels
B2050, B2350, B2650, B3150, WSM GENERAL (2) Rear Wheels Rear Wheels Rear tread width can not be adjusted. IMPORTANT • Always attach tires as shown in the drawings. • If not attached as illustrated, transmission parts may be damaged. • When re-fitting or adjusting a wheel, tighten the bolts to the following torques then recheck after driving the tractor 200 m (200 yards) and 10 times of shuttle movement by 5 m (5 yards), and thereafter according to service interval.
Page 80: Ballast
B2050, B2350, B2650, B3150, WSM GENERAL [3] BALLAST WARNING To avoid personal injury or death: • Additional ballast will be needed for transporting heavy implements. When the implement is raised, drive slowly over rough ground, regardless of how much ballast is used. •...
Page 81 B2050, B2350, B2650, B3150, WSM GENERAL Rear Ballast Add weight to rear wheels if needed to improve traction or for stability. The amount of rear ballast should be matched to job and the ballast should be removed when it is not needed. The weight should be added to the tractor in the form of liquid ballast.
Page 82: Implement Limitations
KUBOTA. Use with implements which are not sold or approved by KUBOTA and which exceed the maximum specifications listed below, or which are otherwise unfit for use with the KUBOTA Tractor may result in malfunctions or failures of the tractor, damage to other property and injury to the operator or others. [Any malfunctions or failures of the tractor resulting from use with improper implements are not covered by the warranty.]...
Page 83 • Max. Oil Pressure 16.6 MPa (169 kgf/cm , 2410 psi) NOTE • The value of MAX. Lifting capacity contains the weight of KUBOTA standard bucket. DANGER To avoid personal injury or death: • Special attention should be made when lifting the load, keep the bucket correctly positioned to prevent spillages.
Page 84 ENGINE KiSC issued 03, 2014 A...
Page 85 MECHANISM CONTENTS 1. ENGINE BODY........................... 1-M1 [1] CLOSED BREATHER [D1105, V1505] ................1-M1 [2] HALF-FLOATING HEAD COVER [D1305] ................1-M1 [3] GOVERNOR......................... 1-M2 KiSC issued 03, 2014 A...
Page 86 B2050, B2350, B2650, B3150, WSM ENGINE 1. ENGINE BODY [1] CLOSED BREATHER [D1105, V1505] Closed breather system has been adopted to prevent the release of blow-by gas into the atmosphere. After its oil content is filtered by oil shield (4), the blow by gas in fed back to the intake manifold through breather valve (3) to be used for re-combustion.
Page 87 B2050, B2350, B2650, B3150, WSM ENGINE [3] GOVERNOR Three Lever Type Fork Lever The governor system is a mechanical governor that used the flyweight (5). The flyweight (5) is mounted on the governor shaft that rotates at the same speed as the crankshaft. Because the feature of this mechanism takes out the engine speed directly as a centrifugal force of weight, the speed control that the change in the engine rotational...
Page 88 B2050, B2350, B2650, B3150, WSM ENGINE (Overloaded Operation) The amount of the movement of the fork lever assembly is limited with the fuel limitation bolt (10) and can not be moved in the direction of the fuel increase. As overload reduces the centrifugal force of the governor weight, which is pressing the torque pin (8) into the floating lever (7), the floating lever pushes the fork lever 1 (6) in the way to increase the fuel supply with the...
Page 89 SERVICING CONTENTS 1. TROUBLESHOOTING.........................1-S1 2. SERVICING SPECIFICATIONS ....................1-S7 3. TIGHTENING TORQUES......................1-S13 [1] TRACTOR SECTION ......................1-S13 [2] ENGINE SECTION ......................1-S13 4. CHECKING, DISASSEMBLING AND SERVICING ..............1-S14 [1] CHECKING AND ADJUSTING....................1-S14 (1) Engine Body ........................1-S14 (2) Lubricating System ......................1-S16 (3) Cooling System ......................1-S17 (4) Fuel System........................1-S19 [2] PREPARATION ........................1-S22 (1) Draining Lubricants and Coolant ...................1-S22...
Page 90: Troubleshooting
B2050, B2350, B2650, B3150, WSM ENGINE 1. TROUBLESHOOTING Reference Symptom Probable Cause and Checking Procedure Solution Page Engine Does Not 1. No fuel Check fuel Start 2. Air in the fuel system Bleed air G-39 3. Water in the fuel system Solution order 1-S19 1.
Page 91 B2050, B2350, B2650, B3150, WSM ENGINE Reference Symptom Probable Cause and Checking Procedure Solution Page Engine Does Not 14.Compression leak from cylinder Solution order 1-S14 Start 1. Check compression pressure 2. Inspect or replace 1-S33 head gasket 3. Inspect or replace 1-S40, piston or piston ring 1-S54...
Page 92 B2050, B2350, B2650, B3150, WSM ENGINE Reference Symptom Probable Cause and Checking Procedure Solution Page Engine Revolution Is 1. Fuel filter clogged or dirty Solution order G-26 Not Smooth 1. Replace fuel filter 2. Check or change fuel 2. Air cleaner clogged Clean or change air G-24 cleaner...
Page 93 B2050, B2350, B2650, B3150, WSM ENGINE Reference Symptom Probable Cause and Checking Procedure Solution Page Oil Leak into Suction 1. Waste oil pipe clogged or deformed Repair or replace pipe 1-S31 Pipe 2. Piston ring seal is damaged Replace piston ring 1-S40 Either Black or Dark 1.
Page 94 B2050, B2350, B2650, B3150, WSM ENGINE Reference Symptom Probable Cause and Checking Procedure Solution Page Excessive Lubricant 1. Piston ring's gap facing the same direction Repair piston ring gap 1-S53 Oil Consumption 2. Oil ring worn or stuck Solution order 1-S54, 1.
Page 95 B2050, B2350, B2650, B3150, WSM ENGINE Reference Symptom Probable Cause and Checking Procedure Solution Page Engine Overheated 1. Engine oil insufficient Check engine oil 2. Fan belt broken or elongated Adjust or replace fan 1-S17 belt 3. Coolant insufficient Check coolant 4.
Page 96: Servicing Specifications
B2050, B2350, B2650, B3150, WSM ENGINE 2. SERVICING SPECIFICATIONS ENGINE BODY Item Factory Specification Allowable Limit Compression Pressure 3.73 to 4.11 MPa 2.26 MPa 38.0 to 42.0 kgf/cm 23.0 kgf/cm 541 to 597 psi 327 psi • Variance Among Cylinders –...
Page 97 B2050, B2350, B2650, B3150, WSM ENGINE Item Factory Specification Allowable Limit Rocker Arm Shaft to Rocker Arm Clearance 0.016 to 0.045 mm 0.10 mm 0.00063 to 0.0017 in. 0.0039 in. • Rocker Arm Shaft O.D. 11.973 to 11.984 mm – 0.47138 to 0.47181 in.
Page 98 B2050, B2350, B2650, B3150, WSM ENGINE Factory Specification Allowable Limit Item Piston Pin Bore I.D. 22.000 to 22.013 mm 22.03 mm 0.86615 to 0.86665 in. 0.8673 in. Piston Pin to Small End Bushing Clearance 0.014 to 0.038 mm 0.15 mm 0.00055 to 0.0014 in.
Page 99 B2050, B2350, B2650, B3150, WSM ENGINE Item Factory Specification Allowable Limit Crankpin to Crankpin Bearing Oil Clearance 0.029 to 0.091 mm 0.20 mm 0.0011 to 0.0036 in. 0.0079 in. • Crankpin O.D. 39.959 to 39.975 mm – 1.5732 to 1.5738 in. •...
Page 100 B2050, B2350, B2650, B3150, WSM ENGINE Item Factory Specification Allowable Limit Crankshaft to Crankshaft Bearing 3 [D1305] Oil Clearance 0.0340 to 0.103 mm 0.20 mm 0.00134 to 0.00405 in. 0.0079 in. • Crankshaft Journal O.D. 51.921 to 51.940 mm – 2.0442 to 2.0448 in.
Page 101 B2050, B2350, B2650, B3150, WSM ENGINE FUEL SYSTEM Item Factory Specification Allowable Limit Injection Pump Injection Timing 0.2837 to 0.3097 rad – [D1105] (16.25 to 17.75 °) after T.D.C. Injection Timing 0.2662 to 0.2923 rad – [D1305] (15.25 to 16.75 °) before T.D.C.
Page 102: Tightening Torques
B2050, B2350, B2650, B3150, WSM ENGINE 3. TIGHTENING TORQUES Tightening torque of screws, bolts and nuts on the table below are specially specified. (For general use screws, bolts and nuts: See page G-10.) NOTE • In removing and applying the bolts and nuts marked with "*", a pneumatic wrench or similar pneumatic tool, if employed, must be used with enough care not to get them seized.
Page 103: Checking, Disassembling And Servicing
B2050, B2350, B2650, B3150, WSM ENGINE 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING (1) Engine Body Compression Pressure 1. Operate the engine until it is warmed up. 2. Stop the engine. 3. Remove the air cleaner, the muffler and all glow plugs (or nozzles).
Page 104 B2050, B2350, B2650, B3150, WSM ENGINE Valve Clearance 1 (ROPS Model) IMPORTANT • Valve clearance must be checked and adjusted when engine is cold. 1. Remove the head cover, the glow plugs and the timing window cover on the clutch housing. 2.
Page 105: Lubricating System
B2050, B2350, B2650, B3150, WSM ENGINE Valve Clearance 2 (CABIN Model) IMPORTANT • Valve clearance must be checked and adjusted when engine is cold. 1. Remove the head cover and the glow plugs. 2. Check and adjust the valve clearance at the both valves compression top dead center.
Page 106: Cooling System
B2050, B2350, B2650, B3150, WSM ENGINE (3) Cooling System Fan Belt Tension 1. Measure the deflection (A), depressing the belt halfway between the fan drive pulley and alternator pulley at specified force (98 N, 10 kgf, 22 lbf). 2. If the measurement is not within the factory specifications, loosen the alternator mounting screws and relocate the alternator to adjust.
Page 107 B2050, B2350, B2650, B3150, WSM ENGINE CAUTION • When removing the radiator cap, wait at least ten minutes after the engine has stopped and cooled down. Otherwise, hot water may gush out, scalding nearby people. 9Y1210982ENS0013US0 Radiator Cap Air Leakage 1.
Page 108: Fuel System
B2050, B2350, B2650, B3150, WSM ENGINE (4) Fuel System Injection Timing 1. Remove the injection pipes. 2. Remove the engine stop solenoid. 3. Turn the flywheel counterclockwise (facing the flywheel) until fuel flows from the delivery valve holder. 4. Continue to turn the flywheel slowly, and stop it as soon as the fuel level at the tip of the delivery valve holder begins to increase.
Page 109 5. Set the speed control lever to the maximum speed position. 6. Operate the starter to increase the pressure. 7. If the pressure can not reach the allowable limit, replace the pump with new one or repair with a Kubota-authorized pump service shop. 13.73 MPa...
Page 110 B2050, B2350, B2650, B3150, WSM ENGINE Nozzle Spraying Condition CAUTION • Check the injection pressure and condition after you make sure that there is nobody standing in the direction the fume goes. • If the fume from the nozzle directly injects the human body, cells may be destroyed and blood poisoning may be caused.
Page 111: Preparation
B2050, B2350, B2650, B3150, WSM ENGINE Nozzle Holder 1. Secure the nozzle retaining nut (7) with a vise. 2. Remove the nozzle holder (1), and take out parts inside. (When reassembling) • Assemble the nozzle in clean fuel oil. • Install the push rod (4), noting its direction. •...
Page 112 4. After draining the transmission fluid, reinstall the drain plugs (1), (3), (5). IMPORTANT • Use only KUBOTA UDT oil. Use of other oils may damage the transmission or hydraulic system. Refer to G-8. • Never work the tractor immediately after changing the transmission oil.
Page 113: Separating Engine From Clutch Housing (Cabin)
B2050, B2350, B2650, B3150, WSM ENGINE (2) Separating Engine from Clutch Housing (CABIN) Bonnet 1. Open the bonnet (1) and disconnect the battery negative cable. 2. Disconnect the connector for head light and remove the clamp (2). 3. Remove the snap pin (3). 4.
Page 114 B2050, B2350, B2650, B3150, WSM ENGINE Fuel 1. Disconnect the fuel hose (1) from the fuel filter (2). 2. Drain the fuel to the fuel tank completely. (1) Fuel Hose (from Fuel Tank) (2) Fuel Filter 9Y1210982ENS0114US0 Compressor, Condenser and Receiver 1.
Page 115 B2050, B2350, B2650, B3150, WSM ENGINE Wiring Harness and Clamp (Left Side) 1. Disconnect the wiring harness (1) from cabin side wiring harness, engine, alternator and starter. 2. Remove the clamp (2). (1) Wiring Harness (2) Clamp 9Y1210982ENS0116US0 Accelerator Rod, Power Steering Hose,...
Page 116: Separating Engine From Front Axle Frame (Cabin)
B2050, B2350, B2650, B3150, WSM ENGINE (3) Separating Engine from Front Axle Frame (CABIN) Separating Engine from Front Axle Frame NOTE • When you replace the engine with new one, please record the serial number of new engine and the parts number which is incorporate with its new engine.
Page 117 B2050, B2350, B2650, B3150, WSM ENGINE Fuel 1. Disconnect the fuel hose (1) from the fuel filter (2). 2. Drain the fuel to the fuel tank completely. (1) Fuel Hose (from Fuel Tank) (2) Fuel Filter 9Y1210982CLS0008US0 Wiring Harness, Plate, Stay and Clamp (Left Side) 1.
Page 118 B2050, B2350, B2650, B3150, WSM ENGINE Accelerator Rod, Power Steering Hose, Fuel Hoses, Connectors and Others (Right Side) 1. Disconnect the accelerator rod (1). 2. Remove the clamp (2). In case HST model, disconnect the power steering hose 2 (11) and pipe (12) at Bi-speed case side. 3.
Page 119: Separating Engine From Front Axle Frame (Rops)
B2050, B2350, B2650, B3150, WSM ENGINE Steering Wheel, Meter Panel, Shuttle Lever and Panel Lower Cover 1. Remove the steering wheel cap. 2. Remove the steering wheel mounting nut. 3. Remove the steering wheel with a steering wheel puller (Code No.
Page 120: Disassembling And Assembling
B2050, B2350, B2650, B3150, WSM ENGINE [3] DISASSEMBLING AND ASSEMBLING (1) External Components Fan, Water Hose, Fan Belt, Alternator, Muffler, Air Cleaner, Air Cleaner Bracket, Inlet Hose and etc. 1. Remove the external components as shown in the picture. (When reassembling) •...
Page 121: Cylinder Head And Valve And Oil Pan
B2050, B2350, B2650, B3150, WSM ENGINE (2) Cylinder Head and Valve and Oil Pan Cylinder Head Cover 1. Disconnect the breather hose (1). 2. Remove the head cover nut (2). 3. Remove the cylinder head cover (3). (When reassembling) • Check to see if the cylinder head cover gasket is not damaged. 7 to 8 N·m D1105, V1505 0.7 to 0.9 kgf·m...
Page 122 B2050, B2350, B2650, B3150, WSM ENGINE Rocker Arm and Push Rod 1. Remove the rocker arm bracket nut. 2. Remove the rocker arm assembly (1). 3. Remove the push rods (2). (When reassembling) • When putting the push rods (2) onto the tappets (3), check to see if their ends are properly engaged with the dimples.
Page 123: Gear Case
B2050, B2350, B2650, B3150, WSM ENGINE Tappets 1. Remove the tappets (1) from the crankcase. (When reassembling) • Visually check the contact between tappets and cams for proper rotation. If problem is found, replace tappets. • Before installing the tappets, apply engine oil thinly around them.
Page 124 B2050, B2350, B2650, B3150, WSM ENGINE Gear Case 1. Remove the gear case (1). (When reassembling) • Grease thinly to the oil seal, and install it, ensuring the lip does not come off. (1) Gear Case Bolt Length = 45 mm (1.8 in.) Bolt Length = 50 mm (2.0 in.) Bolt Length = 55 mm (2.2 in.) Bolt Length = 65 mm (2.6 in.)
Page 125 B2050, B2350, B2650, B3150, WSM ENGINE Injection Pump 1. Disconnect the starter spring (4) on the thrust lever side (5). 2. Align the control rack pin (2) with the notch (1) on the crankcase, and remove the injection pump (3). 3.
Page 126 B2050, B2350, B2650, B3150, WSM ENGINE Cam Gear, Idle Gear 1, 2 and Governor Gear 1. Remove the external snap ring (9), and then remove the idle gear 1 (10). 2. Remove the lock nut (1), and then remove the bearing nut (2) with a bearing nut finger socket (11).
Page 127: Piston And Connecting Rod
B2050, B2350, B2650, B3150, WSM ENGINE Oil Pan and Oil Strainer 1. Remove the oil pan mounting screws (5). 2. Remove the oil pan (4). 3. Remove the oil strainer (3). (When reassembling) • After cleaning the oil strainer, check to see that the filter mesh is clean, and install it.
Page 128 B2050, B2350, B2650, B3150, WSM ENGINE Piston 1. Turn the flywheel and bring the piston to top dead center. 2. Draw out the piston upward by lightly tapping it from the bottom of the crankcase with the grip of a hammer. 3.
Page 129 B2050, B2350, B2650, B3150, WSM ENGINE Piston Ring and Connecting Rod 1. Remove the piston rings using a piston ring tool. 2. Remove the piston pin (7), and separate the connecting rod (6) from the piston (5). (When reassembling) • Install the rings so that the manufacturer's mark (12) near the gap faces the top of the piston.
Page 130: Crankshaft
B2050, B2350, B2650, B3150, WSM ENGINE (5) Crankshaft Flywheel 1. Secure the flywheel to keep it from turning, using a flywheel stopper. 2. Remove all flywheel screws (1) and then remove the flywheel (2). (When reassembling) • Align the "1TC" mark (a) on the the outer surface of the flywheel horizontally with the alignment mark (b) on the rear end plate.
Page 131 B2050, B2350, B2650, B3150, WSM ENGINE Crankshaft Assembly (Except D1305) 1. Remove the main bearing case screw 2 (1). 2. Pull out the crankshaft assembly. IMPORTANT • Take care to protect crankshaft bearing 1 from scratches, caused by the crank gear, etc.. (Wrap the gear in vinyl tape, etc.).
Page 132: Servicing
B2050, B2350, B2650, B3150, WSM ENGINE Main Bearing Case Assembly 1. Remove the two main bearing case screws 1 (3) of each main bearing cases. 2. Remove the main bearing case from crankshaft. (When reassembling) • Clean the oil passage in the main bearing cases. •...
Page 133 B2050, B2350, B2650, B3150, WSM ENGINE Cylinder Head Surface Flatness 1. Clean the cylinder head surface. 2. Place a straightedge on the cylinder head's four sides and two diagonal as shown in the figure. 3. Measure the clearance with a thickness gauge. 4.
Page 134 B2050, B2350, B2650, B3150, WSM ENGINE Clearance between Valve Stem and Valve Guide 1. Remove carbon from the valve guide section. 2. Measure the valve stem O.D. with an outside micrometer. 3. Measure the valve guide I.D. with a small hole gauge, and calculate the clearance.
Page 135 B2050, B2350, B2650, B3150, WSM ENGINE Valve Seating 1. Coat the valve face lightly with prussian blue and put the valve on its seat to check the contact. 2. If the valve does not seat all the way around the valve seat or the valve contact is less than 70 %, correct the valve seating as follows.
Page 136 B2050, B2350, B2650, B3150, WSM ENGINE Correcting Valve and Valve Seat NOTE • Before correcting the valve and the seat, check the valve stem and the I.D. of valve guide section, and repair them if necessary. • After correcting the valve seat, be sure to check the valve recessing.
Page 137 B2050, B2350, B2650, B3150, WSM ENGINE Free Length and Tilt of Valve Spring 1. Measure the free length (B) of valve spring with vernier calipers. If the measurement is less than the allowable limit, replace it. 2. Put the valve spring on a surface plate, place a square on the side of the valve spring.
Page 138: Idle Gear And Camshaft
B2050, B2350, B2650, B3150, WSM ENGINE Push Rod Alignment 1. Place the push rod on V blocks. 2. Measure the push rod alignment. 3. If the measurement exceeds the allowable limit, replace the push rod. 0.25 mm Push rod alignment Allowable limit 0.0098 in.
Page 139 B2050, B2350, B2650, B3150, WSM ENGINE Idle Gear 1 and 2 Side Clearance 1. Set a dial indicator with its tip on the idle gear. 2. Measure the side clearance by moving the idle gear to the front and rear. 3.
Page 140: Piston And Connecting Rod
B2050, B2350, B2650, B3150, WSM ENGINE Oil Clearance of Camshaft Journal 1. Measure the camshaft journal O.D. with an outside micrometer. 2. Measure the cylinder block bore I.D. for camshaft with a cylinder gauge, and calculate the oil clearance. 3. If the oil clearance exceeds the allowable limit, replace the camshaft.
Page 141 B2050, B2350, B2650, B3150, WSM ENGINE Oil Clearance between Piston Pin and Small End Bushing 1. Measure the piston pin O.D. where it contacts the bushing with an outside micrometer. 2. Measure the small end bushing I.D. with an inside micrometer, and calculate the oil clearance.
Page 142 B2050, B2350, B2650, B3150, WSM ENGINE Piston Ring Gap 1. Insert the piston ring into the lower part of the cylinder (the least worn out part) with a piston. 2. Measure the ring gap with a thickness gauge. 3. If the measurement exceeds the allowable limit, replace the piston ring.
Page 143 B2050, B2350, B2650, B3150, WSM ENGINE Clearance between Piston ring and Piston Ring Groove 1. Clean the rings and the ring grooves, and install each ring in its groove. 2. Measure the clearance between the ring and the groove with a feeler gauge or depth gauge.
Page 144: Crankshaft
B2050, B2350, B2650, B3150, WSM ENGINE (4) Crankshaft Crankshaft Side Clearance 1. Set a dial indicator with its tip on the end of the crankshaft. 2. Measure the side clearance by moving the crankshaft to the front and rear. 3. If the measurement exceeds the allowable limit, replace the thrust bearings.
Page 145 B2050, B2350, B2650, B3150, WSM ENGINE Oil Clearance between Crankpin and Crankpin Bearing 1. Clean the crankpin and crankpin bearing. 2. Put a strip of plastigauge on the center of the crankpin. 3. Install the connecting rod cap and tighten the connecting rod screws to the specified torque, and remove the cap again.
Page 146 B2050, B2350, B2650, B3150, WSM ENGINE Oil Clearance between Crankshaft Journal and Crankshaft Bearing 1 1. Measure the O.D. of the crankshaft front journal with an outside micrometer. 2. Measure the I.D. of the crankshaft bearing 1 with an inside micrometer, and calculate the oil clearance.
Page 147 B2050, B2350, B2650, B3150, WSM ENGINE Replacing Crankshaft Bearing 1 (When removing) 1. Press out the used crankshaft bearing 1 using a crankshaft bearing 1 replacing tool. (See page "SPECIAL TOOLS".) (When installing) 1. Clean a new crankshaft bearing 1 and crankshaft journal bore, and apply engine oil to them.
Page 148 B2050, B2350, B2650, B3150, WSM ENGINE Oil Clearance between Crankshaft Journal and Crankshaft Bearing 2 (Crankshaft Bearing 3) 1. Put a strip of plastigauge on the center of the journal. 2. Install the bearing case and tighten the baring case screws 1 to the specified torque, and remove the bearing case again.
Page 149: Cylinder
B2050, B2350, B2650, B3150, WSM ENGINE (Continued) [D1305] 0.0340 to 0.103 mm Factory specification Oil clearance between 0.00134 to 0.00405 in. crankshaft journal and 0.20 mm crankshaft bearing 2 Allowable limit 0.0079 in. Crankshaft journal O.D. 51.921 to 51.940 mm Factory specification (Intermediate) 2.0442 to 2.0448 in.
Page 150: Oil Pump
B2050, B2350, B2650, B3150, WSM ENGINE Correcting Cylinder 1. When the cylinder is worn beyond the allowable limit, bore and hone it to the specified dimension. 78.500 to 78.519 mm Factory specification 3.0906 to 3.0912 in. Oversized cylinder liner I.D. 78.65 mm Allowable limit 3.096 in.
Page 151 CLUTCH KiSC issued 03, 2014 A...
Page 152 MECHANISM CONTENTS 1. STRUCTURE..........................2-M1 [1] MANUAL TRANSMISSION MODEL ..................2-M1 [2] CLUTCH OPERATION ......................2-M2 (1) Clutch "Engaged" ......................2-M2 (2) Clutch "Disengaged"....................... 2-M2 KiSC issued 03, 2014 A...
Page 153 B2050, B2350, B2650, B3150, WSM CLUTCH 1. STRUCTURE [1] MANUAL TRANSMISSION MODEL (1) Engine Flywheel (4) Pressure Plate (7) Clutch Release Fork (10) Clutch Shaft (2) Clutch Disc (5) Diaphragm Spring (8) Clutch Release Bearing (11) Pressure Plate Assembly (3) Clutch Cover (6) Clutch Rod (9) Clutch Release Hub Engine torque is transmitted to the pressure plate assembly (11) via the flywheel (1) which is connected to the...
Page 154 B2050, B2350, B2650, B3150, WSM CLUTCH [2] CLUTCH OPERATION (1) Clutch "Engaged" When the clutch pedal is not depressed, the clutch release bearing (8) and the fingers of the diaphragm spring (5) are not connected to each other. Accordingly, the pressure plate (4) is tightly passed against the flywheel (1) by the diaphragm spring (5).
Page 155 SERVICING CONTENTS 1. TROUBLESHOOTING.........................2-S1 2. SERVICING SPECIFICATIONS ....................2-S2 3. TIGHTENING TORQUES......................2-S3 4. CHECKING, DISASSEMBLING AND SERVICING ..............2-S4 [1] CHECKING AND ADJUSTING....................2-S4 [2] DISASSEMBLING AND ASSEMBLING ................2-S5 (1) Separating Engine From Clutch housing.................2-S5 (2) Separating Clutch Assembly ...................2-S8 [3] SERVICING ...........................2-S9 KiSC issued 03, 2014 A...
Page 156: Troubleshooting
B2050, B2350, B2650, B3150, WSM CLUTCH 1. TROUBLESHOOTING Reference Symptom Probable Cause and Checking Procedure Solution Page Clutch Drags 1. Clutch pedal free travel excessive Adjust clutch pedal 2-S4 2. Dust on clutch disc generated from clutch disc Remove dust 2-S8 facing 3.
Page 157: Servicing Specifications
B2050, B2350, B2650, B3150, WSM CLUTCH 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Clutch Pedal Free Travel 10 to 17 mm – 0.40 to 0.66 in. Clearance between Bolt and Housing Case Clearance "B" Approx. – 8.5 mm 0.33 in. Clutch Disc and Clutch Shaft Backlash –...
Page 158: Tightening Torques
B2050, B2350, B2650, B3150, WSM CLUTCH 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts: Refer to G-10.) Item N·m kgf·m lbf·ft Steering wheel mounting nut 20 to 40 2.1 to 4.0 15 to 29...
Page 159: Checking, Disassembling And Servicing
B2050, B2350, B2650, B3150, WSM CLUTCH 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING Checking Clutch Pedal Free Travel CAUTION • When checking, park the tractor on flat ground, apply the parking brake, stop the engine and remove the key. 1.
Page 160: Disassembling And Assembling
4. After draining the transmission fluid, reinstall the drain plugs (1), (3), (5). IMPORTANT • Use only KUBOTA UDT oil. Use of other oils may damage the transmission or hydraulic system. Refer to G-8. • Never work the tractor immediately after changing the transmission oil.
Page 161 B2050, B2350, B2650, B3150, WSM CLUTCH Hydraulic Hoses from Power Steering Cylinder 1. Disconnect the hydraulic hoses (1), (3) from the power steering cylinder (2). 2. Removing the snap pin (4) and disconnect the bi-speed rod (5). (1) Hydraulic Hose (R.H.) [A] Bi-Speed Turn Model (2) Power Steering Cylinder (3) Hydraulic Hose (L.H.)
Page 162 B2050, B2350, B2650, B3150, WSM CLUTCH Accelerator Rod, Power Steering Hose, Fuel Hoses, Connectors and Others (Right Side) 1. Disconnect the accelerator rod (1). 2. Remove the clamp (2). 3. Disconnect the power steering hose (3), hydraulic delivery pipe (4) and hydraulic inlet hose (5). 4.
Page 163: Separating Clutch Assembly
B2050, B2350, B2650, B3150, WSM CLUTCH Separating Clutch Housing 1. Support the transmission with a disassembling stand. 2. Hook the engine with a hoist. 3. Remove the docking bolts and nuts between the engine and the front case. (When reassembling) •...
Page 164: Servicing
B2050, B2350, B2650, B3150, WSM CLUTCH [3] SERVICING Backlash between Clutch Disc and Clutch Shaft 1. Mount the clutch disc onto the propeller shaft. 2. Hold the propeller shaft so that it does not rotate. 3. Slightly move the disc and measure the displacement around the disc edge.
Page 165 TRANSMISSION KiSC issued 03, 2014 A...
Page 166 MECHANISM CONTENTS 1. STRUCTURE..........................3-M1 [1] MANUAL TRANSMISSION (WITHOUT BI-SPEED TURN AND MID-PTO MODEL)... 3-M1 [2] MANUAL TRANSMISSION (WITHOUT BI-SPEED TURN AND WITH MID-PTO MODEL)..........................3-M2 [3] MANUAL TRANSMISSION (WITH BI-SPEED TURN AND WITHOUT MID-PTO MODEL)..........................3-M3 [4] MANUAL TRANSMISSION (WITH BI-SPEED TURN AND MID-PTO MODEL) ....3-M4 [5] HST (WITH BI-SPEED TURN AND MID-PTO MODEL)............
Page 167 9. PTO SYSTEM (MECHANICAL PTO CLUTCH MODEL) ............3-M39 [1] STRUCTURE........................3-M39 [2] REAR PTO SECTION ......................3-M40 [3] REAR PTO / MID-PTO SECTION ..................3-M41 [4] MID-PTO SECTION......................3-M41 [5] ONE-WAY CLUTCH SYSTEM ................... 3-M42 10. DIFFERENTIAL GEAR SYSTEM ..................... 3-M43 [1] DIFFERENTIAL FUNCTION....................
Page 168: Structure
B2050, B2350, B2650, B3150, WSM TRANSMISSION 1. STRUCTURE [1] MANUAL TRANSMISSION (WITHOUT BI-SPEED TURN AND MID-PTO MODEL) (1) Main Clutch Section (4) Mechanical PTO Clutch (7) Rear PTO Gear Section From Front Case (2) Main Gear Shift Section Section (8) Front Wheel Drive Gear To Front Axle (3) Shuttle Shift Section (5) Range Gear Shift Section...
Page 169: Manual Transmission (With Bi-Speed Turn And Without Mid-Pto Model)
B2050, B2350, B2650, B3150, WSM TRANSMISSION [2] MANUAL TRANSMISSION (WITHOUT BI-SPEED TURN AND WITH MID-PTO MODEL) (1) Main Clutch Section (4) Mechanical PTO Clutch (7) Rear PTO Gear Section From Front Case (2) Main Gear Shift Section Section (8) Mid-PTO Gear Section To Front Axle (3) Shuttle Shift Section (5) Range Gear Shift Section...
Page 170: Manual Transmission (With Bi-Speed Turn And Mid-Pto Model)
B2050, B2350, B2650, B3150, WSM TRANSMISSION [3] MANUAL TRANSMISSION (WITH BI-SPEED TURN AND WITHOUT MID-PTO MODEL) (1) Main Clutch Section (4) Mechanical PTO Clutch (7) Rear PTO Gear Section From Front Case (2) Main Gear Shift Section Section (8) Front Wheel Drive Gear To Bi-Speed Turn Gear (3) Shuttle Shift Section (5) Range Gear Shift Section...
Page 171 B2050, B2350, B2650, B3150, WSM TRANSMISSION [4] MANUAL TRANSMISSION (WITH BI-SPEED TURN AND MID-PTO MODEL) (1) Main Clutch Section (5) Range Gear Shift Section (9) Front Wheel Drive Gear From Front Case (2) Main Gear Shift Section (6) Differential Gear Section Section To Bi-Speed Turn Gear (3) Shuttle Shift Section...
Page 172: Hst (With Bi-Speed Turn And Mid-Pto Model)
B2050, B2350, B2650, B3150, WSM TRANSMISSION [5] HST (WITH BI-SPEED TURN AND MID-PTO MODEL) (1) Hydrostatic Transmission (4) Rear PTO Gear Section (7) Front Wheel Drive Gear From Front Case (HST) Section (5) Range Gear Section Section To Bi-Speed Turn Gear (2) Hydrostatic PTO Section (6) Mid-PTO Gear Section (8) Bi-Speed Turn Gear Section...
Page 173: Front Case
B2050, B2350, B2650, B3150, WSM TRANSMISSION 2. FRONT CASE [1] STRUCTURE (HST WITH BI-SPEED TURN MODEL) In this tractor, clutch disk is not installed. The steel plate (3) is installed on the clutch shaft (4). Power from the engine is transmitted through the steel plate (3) to the clutch shaft (4) and HST pump shaft.
Page 174: Bi-Speed Turn Linkage
B2050, B2350, B2650, B3150, WSM TRANSMISSION [2] BI-SPEED TURN LINKAGE (1) Linkage Bi-Speed Turn lever is connected to the Bi-Speed rod (1) and the Bi-Speed Turn ON/OFF shift shaft (3). The left bevel gear case of the front axle is connected to the front Bi-Speed Turn shift shaft (4) with a Bi-Speed rod 2 (5).
Page 175: Linkage: Bi-Speed Turn "Disengaged
B2050, B2350, B2650, B3150, WSM TRANSMISSION (3) Linkage: Bi-Speed Turn "Disengaged" When the Bi-Speed Turn lever is shifted to "OFF" position, the Bi-Speed rod 1 (1) is pushed up and the Bi-Speed Turn ON/OFF shift shaft (2) is rotated clockwise. It is kept "OFF". When steering the steering wheel to "Straight", the Bi-Speed rod 2 connected to the left bevel gear case is not pulled.
Page 176: Bi-Speed Turn Powertrain
B2050, B2350, B2650, B3150, WSM TRANSMISSION [3] BI-SPEED TURN POWERTRAIN (1) HYDRAULIC CIRCUIT Manual Transmission Model (1) Bi-Speed Turn Clutch To 3-Points Hitch (2) Bi-Speed Turn Valve 2 From Pump Port (3) Bi-Speed Turn Valve 1 (4) Regulating Valve (5) Power Steering Controller 9Y1210982TRM0010US0 HST Model (1) Bi-Speed Turn Clutch...
Page 177: Bi-Speed Turn "Engaged
B2050, B2350, B2650, B3150, WSM TRANSMISSION (2) Bi-Speed Turn "Engaged" When a operator engage the Bi-Speed Turn lever to "ON" position and the front wheel steering angle is above approximately 0.714 rad (42 °), the Bi-Speed Turn engages. At the time, since both the Bi-Speed Turn valve 1 and the Bi-Speed Turn valve 2 open, the pressured oil enter into the Bi-Speed Turn clutch shaft (8).
Page 178: Manual Transmission
B2050, B2350, B2650, B3150, WSM TRANSMISSION 3. MANUAL TRANSMISSION [1] STRUCTURE (1) Main Gear Shift Section Main shift section consists of three speeds.  1st Speed Gear The 23T F2 gear (shifter) (3) slides to the engine side. The 23T F2 gear (shifter) (3) meshes to the 13T F1 gear (2).
Page 179: Shuttle Gear Shift Section
B2050, B2350, B2650, B3150, WSM TRANSMISSION (2) Shuttle Gear Shift Section The power shifted in the main gear shift section is transmitted from the 16T-32T-26T-13T shaft (2) to the shuttle shaft (3). The shuttle shift gears are the sliding mesh gears. The reverse shaft is the front wheel drive shaft (8).
Page 180: Hydrostatic Transmission
B2050, B2350, B2650, B3150, WSM TRANSMISSION 4. HYDROSTATIC TRANSMISSION [1] STRUCTURE Hydrostatic transmission is composed of variable displacement piston pump, fixed displacement piston motor and valve system. (1) Input Shaft (Pump Shaft) (6) Check Port (2) Housing (7) Check Port (3) Check and High Pressure (8) Check and High Pressure Relief Valve (Reverse)
Page 181 B2050, B2350, B2650, B3150, WSM TRANSMISSION (1) Cylinder Block (Motor) (9) Piston (2) Piston (10) Cylinder Block (Pump) (3) Thrust Collar (11) Charge Relief Valve (4) Motor Shaft (12) Needle Bearing (5) Retainer Plate (13) Valve Plate (6) Thrust Collar (14) Check and High Pressure (7) Pump Shaft Relief Valve...
Page 182: Pump And Motor
B2050, B2350, B2650, B3150, WSM TRANSMISSION [2] PUMP AND MOTOR (1) Piston (3) Oil (A) Pump (a) Swashplate (2) Cylinder (B) Motor Pump and motor cylinder, each containing pistons, are connected by lines. Cylinders and lines are filled with oil piston ride against swashplates located in pump and motor.
Page 183: Oil Flow And Valves
B2050, B2350, B2650, B3150, WSM TRANSMISSION [3] OIL FLOW AND VALVES (1) Oil Filter Cartridge (for HST) (7) Check and High Pressure (11) Independent PTO Control (15) Oil Tank (2) Swashplate Relief Valve (for Forward) Valve (16) Hydraulic Pump (3) Cylinder Block (for Pump) (8) Check and High Pressure (12) Oil Cooler (for 3-points Hitch)
Page 184 B2050, B2350, B2650, B3150, WSM TRANSMISSION (Continued) The pump and the motor are joined in a closed hydraulic circuit. Most of oil circulates with in the main oil circuit. A little oil lubricates and oozes out from the clearance between the moving parts in the case. Then oil in the main oil circuit of the HST needs to be supplied a want.
Page 185 B2050, B2350, B2650, B3150, WSM TRANSMISSION Neutral (1) Oil Filter Cartridge (for HST) (8) Check and High Pressure (14) Hydraulic Pump Pump A Port (2) Swashplate Relief Valve (for Reverse) (for Power Steering, Pump B Port (3) Cylinder Block (for Pump) (9) Neutral Valve (for Forward) Independent PTO, HST) Motor C Port...
Page 186 B2050, B2350, B2650, B3150, WSM TRANSMISSION (Continued) When the speed control pedal (HST pedal) is in "Neutral", the variable swashplate is right-angles to the pump pistons. And the pump pistons only rotate with cylinder block (pump) without reciprocating. Since the oil is not being pumped to the motor, the cylinder block (motor) is stationary. And the output shaft does not rotate.
Page 187 B2050, B2350, B2650, B3150, WSM TRANSMISSION Forward (1) Oil Filter Cartridge (for HST) (8) Check and High Pressure (14) Hydraulic Pump Pump A Port (2) Swashplate Relief Valve (for Reverse) (for Power Steering, Pump B Port (3) Cylinder Block (for Pump) (9) Neutral Valve (for Forward) Independent PTO, HST) Motor C Port...
Page 188 B2050, B2350, B2650, B3150, WSM TRANSMISSION (Continued) When the speed control pedal (HST pedal) is stepped on and set to "Forward", the variable swashplate is tilted as shown in figure above. As the pump cylinder block rotates with the input shaft, oil is forced out of pump port A at high pressure. As pressure oil from the pump cylinder block enters to motor port C, the pistons, which align with port C, are pushed against the swashplate and slide down the inclined surface.
Page 189 B2050, B2350, B2650, B3150, WSM TRANSMISSION Reverse (1) Oil Filter Cartridge (for HST) (8) Check and High Pressure (14) Hydraulic Pump Pump A Port (2) Swashplate Relief Valve (for Reverse) (for Power Steering, Pump B Port (3) Cylinder Block (for Pump) (9) Neutral Valve (for Forward) Independent PTO, HST) Motor C Port...
Page 190: Control Linkage
B2050, B2350, B2650, B3150, WSM TRANSMISSION (Continued) When the speed control pedal (HST pedal) is stepped on and set to "Reverse", the variable swashplate is tilted as shown in figure above. As the pump cylinder block rotates with the input shaft, oil is forced out of pump port B at high pressure. As pressure oil from the pump cylinder block enters to motor port D, the pistons, which align with port D, are pushed against the swashplate and slide down the inclined surface.
Page 191: Cruise Control
B2050, B2350, B2650, B3150, WSM TRANSMISSION 5. CRUISE CONTROL [1] CRUISE CONTROL LINKAGE [CABIN MODEL] (1) Cruise Control (1) Cruise Control Lever (2) Cruise Link Lever (3) Cruise Rear Rod (4) Cruise Front Rod (5) Neutral Holder (6) HST Plate (7) Trunnion Shaft (8) HST Lever (9) HST Pedal...
Page 192: Cruise Control Release
B2050, B2350, B2650, B3150, WSM TRANSMISSION (2) Cruise Control Release (1) Brake Pedal (2) Cruise Cable (3) Cruise Control Lever (4) Return Spring (5) Return Spring (6) Neutral Holder (7) Trunnion Shaft (8) HST Plate (9) HST Pedal Cruise control release is done by depressing the brake pedals (1). When an operator depresses the brake pedal (1), the cruise cable (2) is pulled by the brake pedals (1).
Page 193: Cruise Control Linkage (Rops Model)
B2050, B2350, B2650, B3150, WSM TRANSMISSION [2] CRUISE CONTROL LINKAGE (ROPS MODEL) (1) Cruise Control (1) Cruise Control Lever (2) Cruise Lock 1 (3) Release Wire (4) Roller (5) Neutral Holder (6) Trunnion Shaft (7) HST Pedal (8) Cruise Lock 2 (9) Brake Rod (10) Cruise Rod (11) HST Plate...
Page 194: Cruise Control Release
B2050, B2350, B2650, B3150, WSM TRANSMISSION (2) Cruise Control Release (1) Cruise Control Lever (2) Cruise Lock 1 (3) Release Wire (4) Roller (5) Neutral Holder (6) Trunnion Shaft (7) HST Pedal (8) Brake Pedal (9) Cruise Lock 2 (10) Brake Rod (11) Cruise Rod (12) HST Plate (13) HST Lever...
Page 195: Range Gear Shift Section
B2050, B2350, B2650, B3150, WSM TRANSMISSION 6. RANGE GEAR SHIFT SECTION Range gear shift lever (1) is located at left side fender. Range gear shift lever (1) can select three speed range, low speed, mid speed and high speed. Range gear shift lever (1) and shifter gear (10) are linked with range shift arm (3) and range shift fork (2) etc..
Page 196: Front Wheel Drive Section
B2050, B2350, B2650, B3150, WSM TRANSMISSION 7. FRONT WHEEL DRIVE SECTION Front wheel drive lever (1) is located at the front floor cover. Front wheel drive lever (1) and shifter (3) are linked. shifter gear (5) is located on the front wheel drive shaft (4).
Page 197: Pto System (Hydraulic Pto Clutch Model)
B2050, B2350, B2650, B3150, WSM TRANSMISSION 8. PTO SYSTEM (HYDRAULIC PTO CLUTCH MODEL) [1] STRUCTURE The PTO shift lever (1) is located at left side fender. The PTO shift lever (1) and the PTO shift arm (2) are linked with the control rod (5).The PTO shift arm (2) and the rear PTO arm (3) linked with the rear PTO control plate.
Page 198: Rear Pto Section
B2050, B2350, B2650, B3150, WSM TRANSMISSION [2] REAR PTO SECTION When the PTO shift lever (1) is set to "REAR PTO" (R) position, the PTO shift lever (1) pushes the control rod (5). The control rod (5) pushes the PTO shift arm (2). In this state, the PTO shift arm (2) shifts the PTO shifter (7) forward.
Page 199: Rear Pto / Mid-Pto Section
B2050, B2350, B2650, B3150, WSM TRANSMISSION [3] REAR PTO / MID-PTO SECTION When the PTO shift lever (1) is set to "REAR PTO / MID PTO" (R/M) position, the PTO shift lever (1) pulls the control rod. The control rod (5) pulls the PTO shift arm (2). In this state, the PTO shifter (7) keeps its position between the independent PTO shaft spline (9) and the 26T mid gear spline (11).
Page 200: Mid-Pto Section
B2050, B2350, B2650, B3150, WSM TRANSMISSION [4] MID-PTO SECTION When the PTO shift lever (1) is set to "MID-PTO" (M) position, the PTO shift lever pulls the control rod (5). The control rod (5) pulls the PTO shift arm (2). In this state, the PTO shift arm (2) shifts the PTO shifter (7) reverse.
Page 201: Independent Pto
B2050, B2350, B2650, B3150, WSM TRANSMISSION (Continued) Power is transmitted from the independent PTO clutch to the Mid PTO shaft as follows. Independent PTO clutch → PTO shifter (7) → 26T mid gear (8) → 25T gear (12) → 17T-26T mid gear (14) →...
Page 202: Independent Pto Control Valve
B2050, B2350, B2650, B3150, WSM TRANSMISSION (2) Independent PTO Control Valve Independent PTO control valve (2) is located at transmission case (1). The independent PTO control valve (2) consists of PTO arm (3), poppet (5), ball (7) and etc.. The PTO arm (3) is connected to control rod (4) and the independent PTO lever.
Page 203: Independent Pto Clutch
B2050, B2350, B2650, B3150, WSM TRANSMISSION (3) Independent PTO Clutch Independent PTO clutch (2) is located behind the HST pump shaft (1) in the transmission case. Independent PTO clutch (2) is operated with pressured hydraulic oil forced from the independent PTO control valve (3).
Page 204: Independent Pto Lever "Engaged
B2050, B2350, B2650, B3150, WSM TRANSMISSION (4) Independent PTO Lever "Engaged" When the independent PTO lever (1) is shifted to the "ENGAGED" position, the PTO arm (3) is turned to "ON" position. Hydraulic oil from P port flows through oil passage (7) of the PTO arm (3), oil passage S1 in the transmission case (6) and oil passage S2 in the PTO clutch shaft (5) to the PTO clutch (4).
Page 205: Independent Pto Lever "Disengaged
B2050, B2350, B2650, B3150, WSM TRANSMISSION (5) Independent PTO Lever "Disengaged" When the independent PTO lever (1) is shifted to the "DISENGAGED" position, the PTO arm (3) is turned to "OFF" position. Hydraulic oil is stopped at the PTO arm (3). This oil flows to the HST port.
Page 206: Pto System (Mechanical Pto Clutch Model)
B2050, B2350, B2650, B3150, WSM TRANSMISSION 9. PTO SYSTEM (MECHANICAL PTO CLUTCH MODEL) [1] STRUCTURE The PTO shift lever location is almost same as the hydraulic PTO clutch model. The PTO positions are selected to three positions, the "Rear PTO" position (R), the "Rear PTO/ the mid-PTO"...
Page 207: Rear Pto Section
B2050, B2350, B2650, B3150, WSM TRANSMISSION (Continued) (1) First Shift Shaft (8) Cir-clip (3) Overrunning Clutch Spring (9) One-way Clutch Spline Boss (4) One-way Clutch Cam (10) Shifter (PTO ON/OFF) (5) Bearing Holder (27) PTO Clutch Shaft (6) Cir-clip (28) PTO ON/OFF Shift Lever (7) Ball Bearing (29) PTO ON/OFF Shift Folk 9Y1210982TRM0039US0...
Page 208: Rear Pto / Mid-Pto Section
B2050, B2350, B2650, B3150, WSM TRANSMISSION [3] REAR PTO / MID-PTO SECTION When the PTO shift lever is set to "Rear PTO/Mid-PTO" position, the PTO shifter (6) slides to "Rear PTO/Mid-PTO" position (R/M). The PTO shifter (6) meshes to both the spline of the PTO clutch shaft (8) and the spline of the 26T mid-PTO gear (7).
Page 209: One-Way Clutch System
B2050, B2350, B2650, B3150, WSM TRANSMISSION [5] ONE-WAY CLUTCH SYSTEM In manual transmission models, a mechanical PTO is adopted. The one-way PTO clutch is located between the first shift shaft (1) and the PTO clutch shaft (18). The one-way clutch consists of the first shift shaft (1), the one-way clutch spring (4), the one-way clutch cam (5), the one-way clutch spline boss (9) and the one-way clutch shaft (18).
Page 210: Differential Gear System
B2050, B2350, B2650, B3150, WSM TRANSMISSION 10. DIFFERENTIAL GEAR SYSTEM [1] DIFFERENTIAL FUNCTION (1) Spiral Bevel Pinion (3) Differential Side Gear (5) Differential Pinion Shaft (7) Differential Side Gear (2) Differential Pinion (4) Spiral Bevel Gear (6) Differential Pinion (8) Differential Case ...
Page 211: Differential Lock
B2050, B2350, B2650, B3150, WSM TRANSMISSION [2] DIFFERENTIAL LOCK (1) Differential Pinion (4) Differential Gear Shaft (Right) (7) Differential Pinion Shaft (9) Differential Gear Shaft (Left) (2) Shift Fork (5) Differential Lock Clutch (8) Spiral Bevel Gear (10) Rear Axle (3) Differential Lock Lever (6) Differential Case When resistance to the right and the left tires are greatly different due to ground conditions or type of work, the...
Page 212 SERVICING CONTENTS 1. TROUBLESHOOTING.........................3-S1 2. SERVICING SPECIFICATIONS ....................3-S6 3. TIGHTENING TORQUES......................3-S8 4. CHECKING, DISASSEMBLING AND SERVICING ..............3-S9 [1] CHECKING AND ADJUSTING....................3-S9 (1) Bi-Speed Turn .........................3-S9 (2) HST ..........................3-S10 (3) Independent PTO Control Valve..................3-S14 [2] PREPARATION ........................3-S15 (1) Draining Lubricants and Coolant ...................3-S15 (2) Separating Transmission from Tractor Body (CABIN)...........3-S17 (3) Separating Engine and Clutch Housing (CABIN) ............3-S21 (4) Separating Transmission from Tractor Body (ROPS) ...........3-S21...
Page 213: Troubleshooting
B2050, B2350, B2650, B3150, WSM TRANSMISSION 1. TROUBLESHOOTING HYDROSTATIC TRANSMISSION Reference Symptom Probable Cause and Checking Procedure Solution Page System Will Not 1. Oil level is low Check oil level or fill 3-S15 Operate in Either oil to proper level Direction 2.
Page 214 B2050, B2350, B2650, B3150, WSM TRANSMISSION Reference Symptom Probable Cause and Checking Procedure Solution Page Loss of Power 1. Oil level is low Check oil level or fill 3-S15 oil to proper level 2. Speed control pedal linkage damaged Repair linkage 3-M23 3.
Page 215 B2050, B2350, B2650, B3150, WSM TRANSMISSION FRONT CASE Reference Symptom Probable Cause and Checking Procedure Solution Page Noise From Front 1. Clutch shaft spline worn Replace clutch shaft 3-S24 Case 2. Bearing worn Inspect or replace 3-S24 bearing 3. Gear worn or broken Replace gear 3-S25 to 3-S28...
Page 216 B2050, B2350, B2650, B3150, WSM TRANSMISSION INDEPENDENT PTO Reference Symptom Probable Cause and Checking Procedure Solution Page PTO Clutch Slip 1. Operating pressure is low Solution order 3-S14 1. Check PTO control valve setting pressure 2. Inspect clutch disc 3-S62 or plate 3.
Page 217 B2050, B2350, B2650, B3150, WSM TRANSMISSION DIFFERENTIAL CASE SECTION Reference Symptom Probable Cause and Checking Procedure Solution Page Excessive or Unusual 1. Insufficient or improper type of transmission Check transmission Noise at All Time fluid used 2. Improper backlash between spiral bevel pinion Inspect or adjust 3-S63 and bevel gear...
Page 218: Servicing Specifications
B2050, B2350, B2650, B3150, WSM TRANSMISSION 2. SERVICING SPECIFICATIONS BI-SPEED TURN SECTION Item Factory Specification Allowable Limit Charge Relief Valve Setting Pressure 0.4 to 0.6 MPa – 4.1 to 6.1 kgf/cm 58 to 87 psi Clutch Disc Thickness 1.70 to 1.90 mm 1.55 mm 0.067 to 0.075 in.
Page 219 B2050, B2350, B2650, B3150, WSM TRANSMISSION TRANSMISSION CASE AND DIFFERENTIAL GEAR Item Factory Specification Allowable Limit Shift Fork to Shift Gear Groove Clearance 0.10 to 0.35 mm 0.5 mm 0.0039 to 0.014 in. 0.02 in. Differential case to Differential Side Gear Clearance 0.025 to 0.066 mm 0.3 mm...
Page 220: Tightening Torques
B2050, B2350, B2650, B3150, WSM TRANSMISSION 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts: See page G-10.) Item N·m kgf·m lbf·ft Checking port plug 30 to 44 3.0 to 4.5 22 to 33...
Page 221: Checking, Disassembling And Servicing
B2050, B2350, B2650, B3150, WSM TRANSMISSION 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING (1) Bi-Speed Turn Charge Pressure CAUTION • When checking, park the tractor on flat ground and fully engage the parking brake. 1. Remove the plug (R 1/8) (1) at the front case right side (Manual transmission model).
Page 222: Hst
B2050, B2350, B2650, B3150, WSM TRANSMISSION (2) HST Charge Pressure CAUTION • When checking, park the tractor on flat ground and fully engage the parking brake. 1. Remove the lowering speed adjusting knob and the seat under cover. 2. Remove the plug from P1 port (reverse) or P2 port (forward). NOTE •...
Page 223 B2050, B2350, B2650, B3150, WSM TRANSMISSION High Pressure Relief Valve Pressure (Reverse) CAUTION • When checking, park the tractor on flat ground and fully engage the parking brake. 1. Remove the lowering speed adjusting knob and the seat under cover. 2.
Page 224 B2050, B2350, B2650, B3150, WSM TRANSMISSION High Pressure Relief Valve Pressure (Forward) CAUTION • When checking, park the tractor on flat ground and fully engage the parking brake. 1. Remove the lowering speed adjusting knob and the seat under cover. 2.
Page 225 Readjustment of Relief Valve (When the HST does not work due to its loose hexagon socket head screw) IMPORTANT • The KUBOTA does not recommend the readjustment of relief valve. And KUBOTA will recommend to replace with genuine parts. • As the HST may be damaged if the pressure is set to higher by mistake, be careful when adjusting it.
Page 226: Independent Pto Control Valve
B2050, B2350, B2650, B3150, WSM TRANSMISSION (3) Independent PTO Control Valve Independent PTO Control Valve Setting Pressure 1. Disconnect the OPC switch connector and remove the seat. 2. Remove the plate (1). 3. Remove the 3-point hitch lowering speed knob (2). 4.
Page 227: Preparation
B2050, B2350, B2650, B3150, WSM TRANSMISSION [2] PREPARATION (1) Draining Lubricants and Coolant Draining Engine Oil CAUTION • Before changing oil, be sure to stop the engine. 1. Start and warm up the engine for approx. 5 minutes. 2. Place an oil pan underneath the engine. 3.
Page 228 4. After draining the transmission fluid, reinstall the drain plugs (1), (3), (5). IMPORTANT • Use only KUBOTA UDT oil. Use of other oils may damage the transmission or hydraulic system. Refer to G-8. • Never work the tractor immediately after changing the transmission oil.
Page 229: Separating Transmission From Tractor Body (Cabin)
B2050, B2350, B2650, B3150, WSM TRANSMISSION Draining Coolant CAUTION • Never remove the radiator cap until coolant temperature is well below its boiling point. Then loosen cap slightly to the stop to relieve any excess pressure before removing cap completely. 1.
Page 230 B2050, B2350, B2650, B3150, WSM TRANSMISSION Seat Under Cover 1. Remove the seat under cover (1). (1) Seat Under Cover 9Y1210982TRS0012US0 HST Pedal and Floor Mat 1. Remove the HST pedal (1) and floor mat (2). (1) HST Pedal (2) Floor Mat 9Y1210982TRS0013US0 Lowering Speed Adjusting Shaft and Front Wheel Drive Lever Knob...
Page 231 B2050, B2350, B2650, B3150, WSM TRANSMISSION Front Loader Cables 1. Loosen the lock nuts (3) and remove the front loader cables (4). (When reassembling) • Set the lock lever (2) to lock position. • Fix the ball joint (1) first. •...
Page 232 B2050, B2350, B2650, B3150, WSM TRANSMISSION Cabin Mounting Bolts 1. Remove the bolts and nuts (1). (When reassembling) 124 to 150 N·m Cabin mounting bolt and Tightening torque 12.7 to 15.2 kgf·m 91.5 to 110 lbf·ft (1) Bolt and Nut 9Y1210982TRS0021US0 Cabin Assembly 1.
Page 233: Separating Engine And Clutch Housing (Cabin)
B2050, B2350, B2650, B3150, WSM TRANSMISSION Main Frame, Sub Frame and Cabin Mount Rear Frame 1. Remove the main frame bolts (1). 2. Remove the both side sub frames (2). 3. Remove the Cabin mount rear frame (3). (When reassembling) 80 to 90 N·m Sub frame mounting bolt 8.2 to 9.1 kgf·m...
Page 234 B2050, B2350, B2650, B3150, WSM TRANSMISSION Step (Manual Transmission Model) 1. Disconnect the accelerator rod (1). 2. Remove the return spring (2). 3. Remove the pin (3) and disconnect brake rod (4) from brake pedal (5). 4. Remove the both side steps (6). (When reassembling) •...
Page 235: Separating Engine And Clutch Housing (Rops)
B2050, B2350, B2650, B3150, WSM TRANSMISSION (5) Separating Engine and Clutch Housing (ROPS) • See page 1-S27. 9Y1210982TRS0120US0 Meter Panel, Wiring Harness and Fuel Tank 1. Remove the meter panel (1). 2. Disconnect the wiring harness. 3. Remove the fuel tank (2) with pillar (3). (1) Meter Panel (3) Pillar (2) Fuel Tank...
Page 236: Disassembling And Assembling
B2050, B2350, B2650, B3150, WSM TRANSMISSION [3] DISASSEMBLING AND ASSEMBLING (1) Front Case Front Case Assembly 1. Support the engine securely. 2. Remove the front case mounting bolts (1). 3. Remove the front case (1) from the frame (3). (When reassembling) •...
Page 237 B2050, B2350, B2650, B3150, WSM TRANSMISSION Steel Plate 1. Remove the steel plate mounting bolts (1). 2. Remove the steel plate (2) from the flywheel. • Apply liquid gasket (Three Bond 1206D or equivalent) to the joint face of the engine and the front case. 23.6 to 27.4 N·m Steel plate mounting bolt Tightening torque...
Page 238 B2050, B2350, B2650, B3150, WSM TRANSMISSION Bi-Speed Turn Clutch Assembly and Front Wheel Drive Shaft 1 1. Remove the clutch shaft 1), the front wheel drive shaft 1 (2) and Bi-Speed Turn clutch shaft (3) from the front case (4). 2.
Page 239 B2050, B2350, B2650, B3150, WSM TRANSMISSION Disassembling Bi-Speed Turn Clutch Assembly 1 1. Remove the bearings (2). 2. Remove the 30T gear (3), the 35T gear (4) and the cir-clip (5). 3. Remove the bearing (9). 4. Remove the thrust collar (8) and the 23T gear (7). (When assembling) •...
Page 240 B2050, B2350, B2650, B3150, WSM TRANSMISSION Disassembling Bi-Speed Turn Clutch Assembly 2 1. Remove the Bi-Speed Turn clutch shaft (1). 2. Loosen and remove the flange nuts (7). 3. Remove the shifter (6). 4. Remove the cir-clip with the special tools (21), (22). 5.
Page 241: Main Gear Shift Section
B2050, B2350, B2650, B3150, WSM TRANSMISSION (2) Main Gear Shift Section Separating Main Gear Shift Section Assembly 1. Remove the propeller shaft (1). 2. Remove the spring pins (3), (4). 3. Remove the main gear shift section mounting bolts (7) and the nuts (6).
Page 242 B2050, B2350, B2650, B3150, WSM TRANSMISSION Removing Mechanical PTO Clutch Cam and Bearing Holder 1. Remove the cir-clip (11). 2. Remove the one way clutch cam (10), the one way clutch spring (9) and the collar (8). 3. Remove the bearing holder mounting bolts (2). 4.
Page 243: Mechanical Pto Clutch Assembly
B2050, B2350, B2650, B3150, WSM TRANSMISSION (3) Mechanical PTO Clutch Assembly Separating Transmission Case from Differential Case 1. Remove the transmission mounting bolts and nuts. 2. Separate the transmission case (1) from the differential case (2). (When reassembling) • Install the coupling to the mechanical PTO clutch shaft. •...
Page 244 B2050, B2350, B2650, B3150, WSM TRANSMISSION Removing PTO ON-OFF Shift Fork and PTO Shift Arm 1. Remove the cir-clip (1) from the PTO clutch shaft (3). 2. Remove the cir-clip (4) the PTO ON-OFF arm shaft (6). 3. Remove the shifter (2) and the PTO clutch spring (7). 4.
Page 245 B2050, B2350, B2650, B3150, WSM TRANSMISSION Removing Disassembling Mechanical Clutch Assembly 1. Remove the rear PTO shifter (23) from the PTO clutch shaft (22). 2. Disassemble the mechanical PTO clutch assembly. (When reassembling) • Check the mechanical PTO clutch assembly parts the damage and wear, replace it.
Page 246: Hydrostatic Transmission (Hst)
B2050, B2350, B2650, B3150, WSM TRANSMISSION (4) Hydrostatic Transmission (HST) HST Assembly 1. Remove the HST mounting bolts (2). 2. Separate the HST assembly (1) from the transmission. (When reassembling) • Install the O-ring (3) to the transmission case. • Apply liquid gasket (Three Bond 1206D or equivalent) to the groove (4) of the transmission case.
Page 247 B2050, B2350, B2650, B3150, WSM TRANSMISSION Plate Push Rod, Neutral Arm and Neutral Holder 1. Remove the plate push rod (1). 2. Remove the spring (4). 3. Remove the neutral arm mounting bolt. 4. Loosen the bolt of the neutral holder (3). 5.
Page 248 B2050, B2350, B2650, B3150, WSM TRANSMISSION Center Section 1 1. Remove the center section mounting hex. bolts (2). 2. Separate the HST housing (3) from the center section (1). (When reassembling) • Use a new gasket. • Install the poppet to the center section (1). Don't drop the spring (5).
Page 249 B2050, B2350, B2650, B3150, WSM TRANSMISSION Valve Plates 1. Pushing the valve plate (2) against the anchor pin (3), lift the valve plate (2) to remove. 2. Remove the valve plate (2). 3. Remove the valve plate (4). (When reassembling) •...
Page 250 B2050, B2350, B2650, B3150, WSM TRANSMISSION Removing Neutral Valve 1. Remove the neutral valve (1) with the rachet handle and the thin socket (27 mm (1.06 in.)). (When reassembling) 58.5 to 68.6 N·m Tightening torque Neutral valve body 6.0 to 7.0 kgf·m 43.4 to 50.6 lbf·ft (1) Neutral Valve (A) Using Correct Tools...
Page 251 B2050, B2350, B2650, B3150, WSM TRANSMISSION Neutral Valve 1. Remove the neutral valve body (4). 2. Remove the pin (6) from the neutral valve body (4). 3. Remove the plug (10) with 2.5 mm hex. wrench (11). 4. Push the neutral valve (3) with 2.5 mm hex. wrench (11) not to damage it.
Page 252 B2050, B2350, B2650, B3150, WSM TRANSMISSION HST Housing Case Cylinder Blocks 1. Remove the cylinder blocks (1) and (4) from the pump shaft (2) and the motor shaft (3). 2. Remove the cir-clip (5) and spring (6) from the cylinder block. (When reassembling) •...
Page 253 B2050, B2350, B2650, B3150, WSM TRANSMISSION Piston and Retainer Plate 1. Remove the pistons (2) with the retainer plates (1). (When reassembling) • Install the piston to its original position of the cylinder block. • Check the direction of the retainer plate (1) as shown in the picture.
Page 254 B2050, B2350, B2650, B3150, WSM TRANSMISSION Motor Shaft 1. Remove the internal cir-clip (5) from the HST housing. 2. Remove the cover with an O-ring. 3. Remove the motor shaft (2) with the ball bearing (6) from the HST housing. 4.
Page 255 B2050, B2350, B2650, B3150, WSM TRANSMISSION Trunnion Shaft 1. Remove the internal cir-clip (1) from the HST housing. 2. Remove the internal cir-clip (8) from the HST housing. 3. Strike out the trunnion shaft (2) slightly with a plastic hammer to the left side not to damage the o-rings (7), (4).
Page 256: Pto Clutch Case (Hst Model)
B2050, B2350, B2650, B3150, WSM TRANSMISSION (5) PTO Clutch Case (HST Model) Separating Differential case and PTO Clutch Case 1. Remove the transmission case mounting bolts. 2. Separate the transmission case (1) from the differential case (2). 3. Remove the PTO brake plate 4 mounting bolt (4). (When reassembling) •...
Page 257: Bevel Pinion Shaft
B2050, B2350, B2650, B3150, WSM TRANSMISSION (6) Bevel Pinion Shaft Bevel Pinion Shaft 1 1. Remove the bevel pinion shaft assembly (1) from the transmission case. 2. Remove the spacer (2). (When reassembling) • Install the spacer (2) to the transmission case. •...
Page 258: Range Gear Shaft
B2050, B2350, B2650, B3150, WSM TRANSMISSION (7) Range Gear Shaft Range Gear Shaft Assembly 1. Remove the cir-clip (1) from the range gear shaft (2). 2. Remove the spring pin from the shift arm lever (4). 3. Remove the range gear shaft assy.(3) and the fork rod (5) from the transmission case.
Page 259: Front Wheel Drive Shaft
B2050, B2350, B2650, B3150, WSM TRANSMISSION (8) Front Wheel Drive Shaft 4WD Shaft 1. Remove the cir-clip from the 4WD shaft (1). 2. Remove the 4WD gear (8) from the 4WD shaft (1). 3. Remove the 4WD shaft (1) with the 25T gear (3). 4.
Page 260: Independent Pto Clutch Shifter
B2050, B2350, B2650, B3150, WSM TRANSMISSION 4WD Shaft Arm 1. Remove the bolt (4) and the washer with rubber (3). (When reassembling) • Install the 4WD gear (5) to the 4WD shaft. • Install the 4WD shaft arm (6) to the 4WD gear (5). •...
Page 261 B2050, B2350, B2650, B3150, WSM TRANSMISSION Installing PTO Shifter 1. Install the spring (3) and the ball (2) to the transmission. 2. Push the ball (2) by finger from the inside of the transmission case. 3. Push the PTO shift arm ball guide (1) into the transmission case as shown in the picture.
Page 262: Independent Pto Clutch
B2050, B2350, B2650, B3150, WSM TRANSMISSION (10) Independent PTO Clutch PTO Clutch Case 1. Remove the external cir-clip (11) from the spline boss (12). 2. Remove the internal cir-clip (13) from the PTO clutch case (2). 3. Remove the clutch disks (9) and the clutch plates (10) from the PTO clutch case (2).
Page 263 B2050, B2350, B2650, B3150, WSM TRANSMISSION PTO Clutch Spring 1. Set the PTO clutch spring compressor (1) to the PTO clutch case (2). 2. Tighten the nut and remove the external cir-clip (3). 3. Remove the spring collar (4) and the PTO clutch spring (5). (1) PTO Clutch Spring Compressor (4) Spring Collar (2) PTO Clutch Case...
Page 264 B2050, B2350, B2650, B3150, WSM TRANSMISSION Spline Boss Cir-clip 1. Push the cir-clip with a small screw driver through the small hole of the spline boss (1). 2. Lift the cir-clip (2) with a screw driver not to damage it. (When reassembling) •...
Page 265 B2050, B2350, B2650, B3150, WSM TRANSMISSION PTO Shaft 1. Remove the thrust bearing (6) and the PTO shifter (4) not to damage the seal rings (5) located at the PTO shaft front side. 2. Remove the seal rings (5) located at the PTO shaft rear side. 3.
Page 266: Mid-Pto Section
B2050, B2350, B2650, B3150, WSM TRANSMISSION (11) Mid-PTO Section Mid-gear and Idle Shaft (Mid-PTO Model) 1. Remove the idle shaft (2) from the transmission case using a screw driver. 2. Remove the mid-gear (1) from the transmission case. 3. Remove the ball bearings (4), (5) and the internal cir-clip (6) from the mid-gear (1).
Page 267 B2050, B2350, B2650, B3150, WSM TRANSMISSION Mid-PTO Case and Mid-gear Shaft (Mid-PTO Model) 1. Remove the mid-PTO case mounting bolts. 2. Remove the mid-PTO case from the transmission case. 3. Remove the mid-PTO oil seal (4) from the mid-PTO case (2) using a screw driver not to damage it.
Page 268: Differential Gear Section
B2050, B2350, B2650, B3150, WSM TRANSMISSION (12) Differential Gear Section Separating Hydraulic Cylinder, Transmission Case and Rear Axles 1. Remove the hydraulic cylinder as an assembly. 2. Separate the transmission case. 3. Separate the rear axles. (When reassembling) 39.3 to 44.1 N·m Hydraulic cylinder 4.0 to 4.5 kgf·m mounting bolt (M10)
Page 269: Servicing
B2050, B2350, B2650, B3150, WSM TRANSMISSION Differential Bearing Holder (R.H.) 1. Remove the differential holder mounting bolts (1). 2. Remove the differential holder (2) and shims (3), (4). (When reassembling) • 0.5 mm (0.020 in.) shim Parts No. 66611-1514-0 • 0.2 mm (0.008 in.) shim Parts No. 66611-1515-0 Differential bearing holder 17.7 to 20.5 N·m Tightening torque...
Page 270: Hst
B2050, B2350, B2650, B3150, WSM TRANSMISSION PTO Brake Disk and Brake Plate 1 1. Measure the PTO brake disk thickness with a vernier calipers. 2. Measure the brake plate thickness with a vernier calipers. 3. If the thickness is less than the allowable limit, replace it. 1.70 to 1.90 mm Factory specification 0.067 to 0.075 in.
Page 271 B2050, B2350, B2650, B3150, WSM TRANSMISSION Piston Slipper and Retainer Plate 1. Check the slipper (1) for flatness. 2. If rounded, replace piston. 3. Measure the thickness of piston slipper. 4. If the measurement is less than the allowable limit, replace the piston.
Page 272 B2050, B2350, B2650, B3150, WSM TRANSMISSION Thrust Collars and Bearing Surface 1. Check the thrust collars (1) for scratches and excessive wear. 2. If worn or scored, replace it. 3. Check the bearing surface (2) of trunnion shaft (swashplate)(3) for scratches and excessive wear. 4.
Page 273: Independent Pto Clutch
B2050, B2350, B2650, B3150, WSM TRANSMISSION Neutral Valve 1. Check the holes of the valve body (9) and the neutral valve (4) for clogging. 2. If clogged, open hole with compressed air. 3. Replace the O-rings (2), (6), (8) and the backup ring (7) for scratches and damage.
Page 274: Transmission Case
B2050, B2350, B2650, B3150, WSM TRANSMISSION Clutch Disc Wear 1. Measure the clutch disc thickness with vernier calipers. 2. If the thickness is less than the allowable limit, replace it. 1.70 to 1.90 mm Factory specification 0.067 to 0.075 in. Clutch disc wear 1.55 mm Allowable limit...
Page 275: Differential Gear
B2050, B2350, B2650, B3150, WSM TRANSMISSION Clearance between Shift Fork and Shift Gear Groove 1. Insert the fork into the shift gear groove and measure the clearance with a feeler gauge. 2. If the clearance exceeds the allowable limit, replace it. 0.10 to 0.35 mm Factory specification Clearance between shift...
Page 276 B2050, B2350, B2650, B3150, WSM TRANSMISSION Clearance between Differential Pinion Shaft and Differential Pinion 1. Measure the differential pinion shaft O.D. with an outside micrometer. 2. Measure the differential pinion I.D. with an inside micrometer, and calculate the clearance. 3. If the clearance exceeds the allowable limit, replace damage parts.
Page 277 B2050, B2350, B2650, B3150, WSM TRANSMISSION Backlash between Spiral Bevel Pinion and Spiral Bevel Gear (1) Shim (2) Spacer (3) Spiral Bevel Pinion (4) Bearing Holder (5) Shim (6) Spiral Bevel Gear (7) Shim 1. Set the dial indicator (lever type) with its finger on the end of spiral bevel pinion (3). 2.
Page 278: Rear Axle
REAR AXLE KiSC issued 03, 2014 A...
Page 279 MECHANISM CONTENTS 1. STRUCTURE..........................4-M1 KiSC issued 03, 2014 A...
Page 280 B2050, B2350, B2650, B3150, WSM REAR AXLE 1. STRUCTURE (1) Differential Gear Shaft (3) Rear Axle Case (5) Spur Gear (7) Differential Gear (2) Ball Bearing (4) Rear Axle (6) Spiral Bevel Gear The rear axles are the semi floating type with ball bearing (2) between the rear axle (4) and the rear axle case (3), which supports the rear wheel load as well as transmitting power to the rear wheels.
Page 281 SERVICING CONTENTS 1. TROUBLESHOOTING.........................4-S1 2. TIGHTENING TORQUES......................4-S2 3. DIASSEMBLING AND SERVICING ....................4-S3 [1] DIASSEMBLING AND ASSEMBLING...................4-S3 (1) Separating Rear Axle Case .....................4-S3 [2] SERVICING ...........................4-S6 KiSC issued 03, 2014 A...
Page 282 B2050, B2350, B2650, B3150, WSM REAR AXLE 1. TROUBLESHOOTING Reference Symptom Probable Cause and Checking Procedure Solution Page Excessive or Unusual 1. Improper backlash between differential gear Inspect or adjust 3-S63 Noise at All Time shaft and final reduction gear backlash 2.
Page 283 B2050, B2350, B2650, B3150, WSM REAR AXLE 2. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts: Refer to G-10.) Item N·m kgf·m lbf·ft Rear wheel mounting nut and screw 108 to 126 11.1 to 12.8 79.7 to 92.9...
Page 284 4. After draining the transmission fluid, reinstall the drain plugs (1), (3), (5). IMPORTANT • Use only KUBOTA UDT oil. Use of other oils may damage the transmission or hydraulic system. Refer to G-8. • Never work the tractor immediately after changing the transmission oil.
Page 285 B2050, B2350, B2650, B3150, WSM REAR AXLE Rear Wheel 1. Place the disassembling stand under the transmission case. 2. Remove the rear wheel (1). Rear wheel B2050 108 to 126 N·m mounting nut B2350 11.1 to 12.8 kgf·m and screw B2650 79.7 to 92.9 lbf·ft 167 to 191 N·m...
Page 286 B2050, B2350, B2650, B3150, WSM REAR AXLE Rear Axle Case (Manual Transmission Model) 1. Remove the brake rod (7) and parking brake rod (8). 2. Remove the oil filter bracket with oil filter (2) and suction pipe (3). 3. Remove the spring (5) and plate (4). 4.
Page 287 B2050, B2350, B2650, B3150, WSM REAR AXLE Rear Axle Shaft 1. Remove the fork rod (1). 2. Remove the ball bearing (4) with a puller. 3. Remove the gear (3). 4. Remove the brake shaft assembly (2). 5. Tap out the rear axle shaft (5) with a rubber hammer to the outside.
Page 288 BRAKES KiSC issued 03, 2014 A...
Page 289 MECHANISM CONTENTS 1. LINKAGE ............................ 5-M1 [1] ROPS ........................... 5-M1 (1) HST Type ........................5-M1 (2) Manual Type........................5-M1 [2] CABIN (HST TYPE)......................5-M2 2. OPERATION..........................5-M3 KiSC issued 03, 2014 A...
Page 290 B2050, B2350, B2650, B3150, WSM BRAKES 1. LINKAGE [1] ROPS (1) HST Type (1) Rear Axle Case (2) Brake Cam Lever (3) Brake Rod (4) Brake Pedal (5) Parking Brake Lever (6) Parking Brake Lever Rod (7) Parking Brake Lever Arm Independent mechanical wet disc brakes are used for the right and left traveling brakes.
Page 291 B2050, B2350, B2650, B3150, WSM BRAKES [2] CABIN (HST TYPE) (1) Parking Brake Lever (2) Brake Pedal (3) Spring (4) Brake Pedal Shaft (5) Brake Pedal Rod (6) Rear Axle Case (7) Brake Cam Lever (8) Brake Rod (9) Parking Brake Lever Rod (10) Parking Brake Arm Independent mechanical wet disc brakes are used for the right and left traveling brakes.
Page 292 B2050, B2350, B2650, B3150, WSM BRAKES 2. OPERATION The brake body incorporated in the rear axle case (1) filled with transmission oil and is designed to brake when the brake disc (8) splined with the differential gear shaft (3) is pressed against the cam plate (7) by means of the cam mechanism incorporating steel balls (2).
Page 293 SERVICING CONTENTS 1. TROUBLESHOOTING.........................5-S1 2. SERVICING SPECIFICATIONS ....................5-S2 3. TIGHTENING TORQUES......................5-S3 4. CHECKING, DISASSEMBLING AND SERVICING ..............5-S4 [1] CHECKING AND ADJUSTING....................5-S4 [2] DISASSEMBLING AND ASSEMBLING ................5-S5 (1) Brake Pedal (Cabin HST Model) ..................5-S5 (2) Brake Pedal (ROPS Manual Transmission Model) ............5-S7 (3) Brake Pedal (ROPS HST Model) ..................5-S7 (4) Parking Brake Lever ......................5-S8 (5) Separating Rear Axle Case .....................5-S8...
Page 294: Troubleshooting
B2050, B2350, B2650, B3150, WSM BRAKES 1. TROUBLESHOOTING Reference Symptom Probable Cause and Checking Procedure Solution Page Uneven Braking 1. Brake pedal free travel unevenly adjusted Check or adjust brake 5-S4 Force pedal free travel 2. Brake disc worn Replace brake disc 5-S10 3.
Page 295: Servicing Specifications
B2050, B2350, B2650, B3150, WSM BRAKES 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Brake Pedal Free Travel 30 to 40 mm – (ROPS) 1.2 to 1.5 in. on the pedal Free Travel 20 to 30 mm – (CABIN) 0.79 to 1.1 in. on the pedal Parking Brake Free Travel...
Page 296: Tightening Torques
B2050, B2350, B2650, B3150, WSM BRAKES 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts: Refer to G-10.) Item N·m kgf·m lbf·ft Steering wheel mounting nut 20 to 40 2.1 to 4.0 15 to 29...
Page 297: Checking, Disassembling And Servicing
B2050, B2350, B2650, B3150, WSM BRAKES 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING Adjusting Brake Pedal Free Travel CAUTION • Stop the engine and chock the wheels before checking brake pedal. • The difference between the right and left pedal free travel must be less than 5 mm (0.2 in.) 1.
Page 298: Disassembling And Assembling
B2050, B2350, B2650, B3150, WSM BRAKES Checking Parking Brake Lever Travel 1. Pull the parking brake lever (1) to the parking position while counting the ratchet sound made by the parking brake lever (1). 2. If the counted ratchet sound is not within the factory specification, adjust the parking brake lever travel.
Page 299 B2050, B2350, B2650, B3150, WSM BRAKES Panel Lower Cover 1. Remove the panel lower cover (1). (1) Panel Lower Cover (2) Bolt 9Y1210982BRS0019US0 Meter Panel 1. Remove the meter panel mounting bolts and disconnect the each connectors. 2. Remove the meter panel (1). (1) Meter Panel 9Y1210982BRS0020US0 Brake Pedal and Brake Rod...
Page 300: Brake Pedal (Rops Manual Transmission Model)
B2050, B2350, B2650, B3150, WSM BRAKES (2) Brake Pedal (ROPS Manual Transmission Model) Brake Pedal and Step 1. Remove the right side step (1). 2. Remove the return spring (2). 3. Remove the pin (3) and disconnect brake rod (4) from brake pedal (5).
Page 301: Parking Brake Lever
B2050, B2350, B2650, B3150, WSM BRAKES (4) Parking Brake Lever Parking Brake Lever 1. Disconnect the parking brake rod (1) from parking brake arm (2). 2. Disconnect parking brake lever plate (3) from parking brake arm (2). 3. Remove the pin (4), parking brake arm (2) and parking brake shaft (5), 4.
Page 302 B2050, B2350, B2650, B3150, WSM BRAKES Differential Lock Clutch and Final Gear 1. Remove the spring (1). 2. Remove the differential lock clutch (3) and the differential shift fork (2). 3. Remove the external cir-clip (5). 4. Remove the ball bearing with a puller. 5.
Page 303 B2050, B2350, B2650, B3150, WSM BRAKES Brake Disks, Brake Plates and Brake Shaft 1. Remove the external cir-clip (6), and remove the brake disks (4) and the brake plates (5). 2. Remove the bearing holder (3) and the ball bearing (2). (When reassembling) NOTE •...
Page 304 B2050, B2350, B2650, B3150, WSM BRAKES Brake Cam Plate and Brake Cam Lever 1. Remove the brake cam plate (1) and the balls (2). (When reassembling) • Apply grease to the balls (2). • If O-ring (4) is damaged, change it. •...
Page 305: Servicing
B2050, B2350, B2650, B3150, WSM BRAKES [3] SERVICING Brake Cam Lever Movement 1. Move the brake cam lever by hand to check the movement. 2. If the movement is heavy, refine the brake cam with emery paper. 9Y1210982BRS0013US0 Cam Plate Flatness and Bearing Holder Wear 1.
Page 306: Front Axle
FRONT AXLE KiSC issued 03, 2014 A...
Page 307 MECHANISM CONTENTS 1. STRUCTURE..........................6-M1 [1] 4 WHEEL DRIVE MODEL ....................6-M1 KiSC issued 03, 2014 A...
Page 308 B2050, B2350, B2650, B3150, WSM FRONT AXLE 1. STRUCTURE [1] 4 WHEEL DRIVE MODEL (1) Axle (6) Bevel Gear (11) Spiral Bevel Gear (16) Spiral Bevel Pinion Shaft (2) Axle Flange (7) Differential Yoke Shaft, L.H. (12) Differential Yoke Shaft, R.H. (17) Bevel Gear Shaft (3) Bevel Gear (8) Front Axle Case...
Page 309 SERVICING CONTENTS 1. TROUBLESHOOTING.........................6-S1 2. SERVICING SPECIFICATIONS ....................6-S2 3. TIGHTENING TORQUES......................6-S3 4. CHECKING, DISASSEMBLING AND SERVICING ..............6-S4 [1] CHECKING AND ADJUSTING....................6-S4 [2] DISASSEMBLING AND ASSEMBLING ................6-S5 (1) Separating Front Axle Assembly ..................6-S5 (2) Disassembling Front Axle Assembly ................6-S6 [3] SERVICING .........................6-S12 KiSC issued 03, 2014 A...
Page 310: Troubleshooting
B2050, B2350, B2650, B3150, WSM FRONT AXLE 1. TROUBLESHOOTING Reference Symptom Probable Cause and Checking Procedure Solution Page Front Wheels Wander 1. Tire pressure uneven Adjust tire pressure G-56 to Right or Left 2. Improper toe-in adjustment (improper Adjust toe-in 6-S4 alignment) 3.
Page 311: Servicing Specifications
B2050, B2350, B2650, B3150, WSM FRONT AXLE 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Front Wheel Alignment Toe-in 0 to 10 mm – 0 to 0.39 in. Front Axle Rocking Force 50.0 to 100.0 N – 5.1 to 10.2 kgf 12.8 to 22.4 lbf Differential Pinion to Differential Case Clearance...
Page 312 B2050, B2350, B2650, B3150, WSM FRONT AXLE 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts: See page G-10.) Item N·m kgf·m lbf·ft Front wheel mounting bolt and nut 77.0 to 90.0 7.9 to 9.2 57.0 to 67.0...
Page 313: Checking, Disassembling And Servicing
B2050, B2350, B2650, B3150, WSM FRONT AXLE 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING Toe-in 1. Inflate the tires to the specified pressure. 2. Turn the front wheels straight ahead. 3. Measure the toe-in ((B) - (A)). 4. If the measurement is not within the factory specifications, adjust the tie-rod length.
Page 314: Disassembling And Assembling
4. Fill with new oil up to the upper notch on the dipstick. NOTE • After ten minutes, check the oil level again, add oil to prescribed level. • Use KUBOTA SUPER UDT fluid or SAE 80, 90 gear oil. Refer to G-8. 3.5 L B2050, B2350, B2650 3.7 U.S.qts...
Page 315: Disassembling Front Axle Assembly
B2050, B2350, B2650, B3150, WSM FRONT AXLE Front Axle Holder and Front Axle 1. Place the disassembling stand under the front axle. 2. Remove the front axle holder mounting bolts (1). 3. Separate the front axle holders (2), (3). 4. Separate the front axle from the front axle frame. (When reassembling) •...
Page 316 B2050, B2350, B2650, B3150, WSM FRONT AXLE Bevel Gear Case 1. Remove the bevel gear case mounting screws. 2. Remove the bevel gear case (2) and front gear case (1) as a unit from the front axle case (4). (When reassembling) •...
Page 317 B2050, B2350, B2650, B3150, WSM FRONT AXLE Bevel Gear Shaft and Bevel Gear Case Oil Seal 1. Remove the external cir-clip (3). 2. Remove the bevel gear case (6) from the front gear case (7). 3. Remove the oil seal (9). 4.
Page 318 B2050, B2350, B2650, B3150, WSM FRONT AXLE Bevel Gear Case Gears 1. Remove the internal snap ring (5). 2. Remove the bevel gears (3), (2) with ball bearings (7), (6) and shims (4). (When reassembling) • Install the shim (4) to their original position. (Reference) •...
Page 319 B2050, B2350, B2650, B3150, WSM FRONT AXLE Axle 1. Remove the bearing (1). 2. Remove the bevel gear (2). 3. Remove the collar (3). 4. Tap out the axle (4). (When reassembling) • Install the oil seal (7) of axle flange (6), noting its direction as shown in the figure.
Page 320 B2050, B2350, B2650, B3150, WSM FRONT AXLE Spiral Bevel Pinion Shaft and Differential Gear Assembly 1. Remove the oil seal from the front axle case (5). 2. Remove the internal cir-clip (2) and the collar (3). 3. Tap out the spiral bevel pinion shaft (4) to the rear side. 4.
Page 321: Servicing
B2050, B2350, B2650, B3150, WSM FRONT AXLE [3] SERVICING Clearance between Differential Case and Differential Pinion 1. Measure the differential pinion boss O.D. with an outside micrometer. 2. Measure the differential case bore I.D. with a cylinder gauge, and calculate the clearance. 3.
Page 322 B2050, B2350, B2650, B3150, WSM FRONT AXLE Backlash between Spiral Bevel Pinion Shaft and Spiral Bevel Gear 1. Place the solder wire (2) on the gear tooth of the spiral bevel gear (1). 2. Install the spiral bevel gear (1) and the differential yoke shaft (3) into the front axle case.
Page 323 B2050, B2350, B2650, B3150, WSM FRONT AXLE Backlash between 10T or 11T Bevel Gear and 16T Bevel Gear 1. Stick a strip of fuse to three spots on the 16T bevel gear (1) with grease. 2. Fix the front axle case, bevel gear case and front gear case. 3.
Page 324 B2050, B2350, B2650, B3150, WSM FRONT AXLE Clearance between Front Axle Case Bosses and Bracket Bushing 1. Measure the front axle case bosses O.D. with an outside micrometer. 2. Measure the bracket Bushing I.D. with a cylinder gauge, and calculate the clearance. 3.
Page 325 STEERING KiSC issued 03, 2014 A...
Page 326 MECHANISM CONTENTS 1. HYDRAULIC CIRCUIT ....................... 7-M1 2. STEERING CONTROLLER......................7-M2 3. STEERING CYLINDER ......................7-M3 4. HYDRAULIC PUMP........................7-M4 KiSC issued 03, 2014 A...
Page 327: Hydraulic Circuit
B2050, B2350, B2650, B3150, WSM STEERING 1. HYDRAULIC CIRCUIT The model is provided with a full hydrostatic power steering. In the hydrostatic power steering, the steering control is connected to the steering cylinder with only the hydraulic piping. Accordingly, it does not have mechanical transmitting parts such as steering gear, pitman arm, drag link, etc..
Page 328: Steering Controller
B2050, B2350, B2650, B3150, WSM STEERING 2. STEERING CONTROLLER The steering controller consists of a control valve (4) and a metering device (3).  Control Valve The control valve is a rotating spool type. When the steering wheel is not turned, the position of the spool (7) and sleeve (9) is kept neutral by the centering spring (8).
Page 329: Steering Cylinder
B2050, B2350, B2650, B3150, WSM STEERING 3. STEERING CYLINDER (1) Rod (3) Rod Cover (5) Piston Seal (7) O-ring (2) Dust Seal (4) U gasket (6) Cylinder Tube The steering cylinder is single piston both rod double-acting type. This steering cylinder is installed parallel to the front axle and connected to tie-rods.
Page 330: Hydraulic Pump
B2050, B2350, B2650, B3150, WSM STEERING 4. HYDRAULIC PUMP • See page 8-M4. 9Y1210982STM0004US0 7-M4 KiSC issued 03, 2014 A...
Page 331 SERVICING CONTENTS 1. TROUBLESHOOTING.........................7-S1 2. SERVICING SPECIFICATIONS ....................7-S3 3. TIGHTENING TORQUES......................7-S4 4. CHECKING, DISASSEMBLING AND SERVICING ..............7-S5 [1] CHECKING..........................7-S5 (1) Relief Valve ........................7-S5 (2) Hydraulic Pump for Power Steering ................7-S5 [2] DISASSEMBLING .........................7-S5 (1) Separating Power Steering Controller (CABIN Type)............7-S5 (2) Separating Power Steering Controller (ROPS Type) ............7-S7 (3) Power Steering Controller (ROPS Type).................7-S7 (4) Power Steering Cylinder....................7-S8...
Page 332: Troubleshooting
B2050, B2350, B2650, B3150, WSM STEERING 1. TROUBLESHOOTING Reference Symptom Probable Cause and Checking Procedure Solution Page Cannot Be Steered 1. Steering controller malfunctioning Replace steering 7-S6 controller Hard Steering 1. Tire air pressure of the tires is incorrect Check air pressure G-56 2.
Page 333 B2050, B2350, B2650, B3150, WSM STEERING Reference Symptom Probable Cause and Checking Procedure Solution Page Low Operating 1. Oil leak from pipe Check or replace pipe 7-S6 Pressure 2. Pipe or hose broken Replace pipe or hose 7-S6, 7-S7 3. Hydraulic pump malfunctioning Solution order 8-S8 1.
Page 334: Servicing Specifications
B2050, B2350, B2650, B3150, WSM STEERING 2. SERVICING SPECIFICATIONS POWER STEERING BODY Item Factory Specification Allowable Limit Relief Valve Setting Pressure 11.5 to 12.5 MPa – 118 to 127 kgf/cm 1670 to 1810 psi POWER STEERING CYLINDER Item Factory Specification Allowable Limit Steering Cylinder I.D.
Page 335 B2050, B2350, B2650, B3150, WSM STEERING 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts: See page G-10.) Item N·m kgf·m lbf·ft Power steering hose for power steering cylinder 24 to 28 2.5 to 2.9 18 to 20...
Page 336: Checking, Disassembling And Servicing
B2050, B2350, B2650, B3150, WSM STEERING 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING (1) Relief Valve Relief Valve Operating Pressure 1. Disconnect the power steering hose L.H. (or R.H.) from steering the power steering cylinder, and set a pressure gauge and cable.
Page 337 B2050, B2350, B2650, B3150, WSM STEERING Power Steering Controller 1. Remove the nuts (2). 2. Disconnect the power steering hoses (3) from the power steering controller (1). 3. Remove the power steering controller mounting bolts (4) from the stay. (When reassembling) •...
Page 338: Separating Power Steering Controller (Rops Type)
B2050, B2350, B2650, B3150, WSM STEERING (2) Separating Power Steering Controller (ROPS Type) Steering Wheel, Meter Panel Bonnet and Fuel Tank • See page 3-S23. 9Y1210982STS0005US0 Steering Post Assembly 1. Remove the steering post mounting bolts. 2. Disconnect the power steering hoses (4) from the power steering controller (2).
Page 339: Power Steering Cylinder
B2050, B2350, B2650, B3150, WSM STEERING (4) Power Steering Cylinder Front Wheels • See page 6-S5. 9Y1210982STS0008US0 Tie-rod Joint 1. Remove the slotted nut (4) and remove the tie-rod end (3). 2. Remove the front axle brackets (1), (2). (When reassembling) •...
Page 340 B2050, B2350, B2650, B3150, WSM STEERING Power Steering Cylinder CAUTION • Since power steering cylinder is full of high-pressured steering oil, high-pressured oil is injected out from hose adopters by pushing piston rods. • This injected oil can penetrate the skin or eyes causing serious injury.
Page 341: Servicing
B2050, B2350, B2650, B3150, WSM STEERING [3] SERVICING (1) Power Steering Cylinder Steering Cylinder I.D. 1. Measure the steering cylinder I.D. with a cylinder gauge. 2. If the cylinder I.D. exceed the allowable limit, replace the cylinder barrel. 40.000 to 40.062 mm Factory specification 1.57480 to 1.57724 in.
Page 342: Hydraulic System
HYDRAULIC SYSTEM KiSC issued 03, 2014 A...
Page 343 MECHANISM CONTENTS 1. HYDRAULIC CIRCUIT ....................... 8-M1 [1] MANUAL TRANSMISSION MODEL (WITHOUT BI-SPEED TURN)........8-M1 [2] MANUAL TRANSMISSION MODEL (WITH BI-SPEED TURN) ........... 8-M2 [3] HST MODEL......................... 8-M3 2. HYDRAULIC PUMP........................8-M4 3. THREE POINTS HYDRAULIC SYSTEM..................8-M5 [1] HYDRAULIC CIRCUIT ......................8-M5 (1) Manual Transmission Model (Without Front Loader Valve) ...........
Page 344: Hydraulic Circuit
B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM 1. HYDRAULIC CIRCUIT [1] MANUAL TRANSMISSION MODEL (WITHOUT BI-SPEED TURN) (1) Oil Filter (4) Power Steering Controller (7) Relief Valve (3-point Hitch (11) Position Control Valve (2) Hydraulic Pump (For 3-point (5) Relief Valve (Power Steering System) (12) Lowering Speed Adjusting Hitch)
Page 345: Manual Transmission Model (With Bi-Speed Turn)
B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM [2] MANUAL TRANSMISSION MODEL (WITH BI-SPEED TURN) (1) Oil Filter (5) Relief Valve (Power Steering (8) Front Hydraulic Outlet (12) Rear Hydraulic Outlet (2) Hydraulic Pump (For 3-point Controller) (9) Relief Valve (3-point Hitch (13) Position Control Valve Hitch) (6) Regulating Valve (Bi-speed...
Page 346: Hst Model
B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM [3] HST MODEL (1) Oil Filter (7) Regulating Valve (Bi-speed (12) Oil Filter (18) Boom Cylinder (2) Hydraulic Pump (For 3-point Turn and Independent PTO (13) HST (19) Bucket Cylinder Hitch) Clutch) (14) Check and High Pressure (20) Rear Hydraulic Outlet (3) Hydraulic Pump (For Power (8) Control Valve for Independent...
Page 347: Hydraulic Pump
B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM 2. HYDRAULIC PUMP The hydraulic pump consists of the casing (1), side plate (4), and two spur gears (drive gear (3) and driven gear (2)) that are in mesh. Hydraulic pump is driven by the fuel camshaft. Maximum displacement is as follows.
Page 348: Three Points Hydraulic System
B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM 3. THREE POINTS HYDRAULIC SYSTEM [1] HYDRAULIC CIRCUIT (1) Manual Transmission Model (Without Front Loader Valve) Two hydraulic pumps (4), (6) are installed in this series tractors. Hydraulic oil is forced from hydraulic pump (5) to the hydraulic outlet (6), relief valve (7), rear outlet (8) and position control valve (11).
Page 349: Relief Valve
B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM [2] RELIEF VALVE (1) Manual Transmission Model (Without Front Loader Valve) Relief valve is located at the hydraulic cylinder right hand side. The implement control system circuit has a relief valve to restrict the maximum pressure in the circuit. The relief valve is a guide piston type with damping effect.
Page 350: Hst Model (With Front Loader Control Valve)
B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM (2) HST Model (With Front Loader Control Valve) The hydraulic raising and lowering circuit is fitted with a relief valve to control the maximum pressure. This is a guide piston relief valve with damper, a direct acting relief valve suitable for relatively high pressure and capacity, and constructed so as to prevent chattering and other unstableness associated with direct...
Page 351: Position Control Valve
B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM [3] POSITION CONTROL VALVE (1) Structure This position control valve (2) is located under the hydraulic cylinder block (1). This control valve is mechanically connected to the position control lever with linkage. This control valve is also mechanically connected to the lift arm with a feed back rod.
Page 352: Operation
B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM (2) Operation Neutral Oil forced into the control valve through P port pushes and opens the unload valve (3), and opens the unload valve (3), and then returns to the transmission case through T1 port. Oil behind the unload valve (3) returns to the transmission case through the groove of the spool (2).
Page 353 B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM Shockless mechanism operating (Lift to Neutral) When the implement begins to lift up, the feedback rod connected to the lift arm pushes back the spool (2) to near "NEUTRAL" position. When the implement lifts up near the "NEUTRAL" position, quantity of oil passing through the orifice (10) is reduced.
Page 354: Feedback Linkage For Position Control
B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM [4] FEEDBACK LINKAGE FOR POSITION CONTROL When the position control lever is moved to rearward to lift the implement, the spool of the position control valve is pushed in to form a lifting circuit by the motions of the control lever arm, the control lever shaft (3), the connecting arm (7) and the lever (8).
Page 355: Front Loader Control Valve (If Equipped)
B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM 4. FRONT LOADER CONTROL VALVE (IF EQUIPPED) [1] STRUCTURE The control valve assembly consists of one casting block and four major section as shown above. 1) Inlet and Outlet Section This section has P and T ports. The P port is connected to the OUTLET port of hydraulic block by the hydraulic hose.
Page 356: Operation
B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM [2] OPERATION Neutral (1) Boom Control Section (5) PB Passage 1 T Port B1: B1 Port (2) Bucket Control Section (6) PB Passage 2 P Port B2: B2 Port (3) Spool (7) Load Check Valve A1: A1 Port PB: PB Port (4) Spool...
Page 357 B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM (1) Boom Control Section (5) Neutral Passage 1 P Port A1: A1 Port (2) Bucket Control Section (6) Load Check Valve T Port (From Boom Cylinder) (3) Spool (7) Passage 1 B1: B1 Port (To Boom Cylinder) (4) PB Passage 1 (8) Boom Cylinder PB: PB Port...
Page 358 B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM Down (1) Boom Control Section (5) Neutral Passage 1 P Port A1: A1 Port (To Boom Cylinder) (2) Bucket Control Section (6) Load Check Valve T Port B1: B1 Port (3) Spool (7) Passage 1 (From Boom Cylinder) (4) PB Passage 1 (8) Boom Cylinder...
Page 359 B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM Floating (1) Boom Control Section (5) Detent Mechanism P Port A1: A1 Port (2) Bucket Control Section (6) Neutral Passage 1 T Port B1: B1 Port (3) Spool (7) Boom Cylinder PB: PB Port (4) PB Passage 1 Low Pressure 1.
Page 360 B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM Roll-back (1) Boom Control Section (6) PB Passage 2 P Port B2: B2 Port (2) Bucket Control Section (7) Load Check Valve T Port (To Bucket Cylinder) (3) PB Passage 1 (8) Passage 2 PB: PB Port Low Pressure (4) Spool...
Page 361 B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM Dump 1 (1) Boom Control Section (6) PB Passage 2 P Port A2: A2 Port (2) Bucket Control Section (7) Load Check Valve T Port (To Bucket Cylinder) (3) PB Passage 1 (8) Passage 2 PB: PB Port B2: B2 Port (4) Spool...
Page 362 B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM Dump 2 (1) Boom Control Section (6) PB Passage 2 P Port A2: A2 Port (2) Bucket Control Section (7) Load Check Valve T Port (To Bucket Cylinder) (3) PB Passage 1 (8) Passage 2 PB: PB Port B2: B2 Port (4) Spool...
Page 363: Remote Control Valve (If Equipped)
B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM 5. REMOTE CONTROL VALVE (IF EQUIPPED) Neutral Pressure-fed oil from the hydraulic pump is delivered into the P port, and flows to the rear hydraulic outlet through BY port. At this time, oil from A port to the T port is blocked by the mechanical check valve (Poppet (1)).
Page 364: Hydraulic Outlet
B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM 6. HYDRAULIC OUTLET [1] MANUAL TRANSMISSION MODEL (1) Front Hydraulic Outlet The hydraulic block type outlet is located at the right hand side of the engine. This hydraulic block type outlet is provided to take power out from the tractor to operate the hydraulic cylinders on the implement, such as front end loader, front blade and so on.
Page 365: Rear Hydraulic Outlet
B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM (2) Rear Hydraulic Outlet (1) Auxiliary Control Valve (2) Rear Hydraulic Outlet (3) Hydraulic Cylinder Body From A Port of Remote Control Valve From B Port of Remote Control Valve To Implement To Position Control Valve P1: From Hydraulic Pump P2: To P Port of Remote Control Valve...
Page 366: Hst Model
B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM [2] HST MODEL (1) Rear Hydraulic Outlet The hydraulic block type outlet is located at the right hand side of the engine. This hydraulic block type outlet is provided to take power out from the tractor to operate the hydraulic cylinders on the implement.
Page 367 SERVICING CONTENTS 1. TROUBLESHOOTING.........................8-S1 2. SERVICING SPECIFICATIONS ....................8-S3 3. TIGHTENING TORQUES......................8-S5 4. CHECKING, DISASSEMBLING AND SERVICING ..............8-S6 [1] CHECKING AND ADJUSTING....................8-S6 (1) Hydraulic Pump (For 3-Point Hitch Hydraulic System)............8-S6 (2) Hydraulic Pump (For Power Steering, Bi-speed Turn, PTO Clutch and HST) ....8-S8 (3) 3-Points Hitch Relief Valve ....................8-S10 (4) Lift Arm ..........................8-S11 [2] DISASSEMBLING AND ASSEMBLING ................8-S11...
Page 368 B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM 1. TROUBLESHOOTING Reference Symptom Probable Cause and Checking Procedure Solution Page Implement Does Not 1. Transmission fluid improper Check transmission Rise (No Noise) 2. Hydraulic pump malfunctioning Solution order 8-S8 1. Check hydraulic flow test 2.
Page 369 B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM Reference Symptom Probable Cause and Checking Procedure Solution Page Implement Drops by 1. Piston O-ring worn or damaged Replace O-ring or 8-S21 Its Weight cylinder 2. Control valve malfunctioning Replace control valve 8-S16 9Y1210982HYS0037US0 8-S2 KiSC issued 03, 2014 A...
Page 370: Servicing Specifications
B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Hydraulic Pump (For 3-Point Hitch) Delivery Above – Condition (At No Pressure) 18.7 L/min. [Manual Transmission Model] 4.94 U.S. gals/min. • Engine rated speed : 2500 min (rpm) 4.11 Imp.
Page 371 B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM Item Factory Specification Allowable Limit Hydraulic Arm Shaft to Bushing Clearance 0.020 to 0.110 mm 0.30 mm 0.0008 to 0.0043 in. 0.0118 in. • Hydraulic Arm Shaft (Right) O.D. 37.925 to 37.950 mm –...
Page 372 B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts: See page G-10.) Item N·m kgf·m lbf·ft Hydraulic pump cover mounting screw 35 to 39 3.5 to 4.0 26 to 28...
Page 373: Checking, Disassembling And Servicing
(1) Hydraulic Pump (For 3-Point Hitch Hydraulic System) Test Preparation (For 3-Point Hitch) IMPORTANT • When using a flowmeter other than KUBOTA specified flowmeter (Code No. 07916-52792), be sure to use the instructions with that flowmeter. • In this hook-up, there is no relief valve. Therefore while testing, do not close the flowmeter loading valve completely.
Page 374 B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM Hydraulic Pump Test (For 3-Point Hitch) NOTE • Before pump testing, do the "Test Preparation". 1. Open flowmeter loading valve completely (Turn counterclockwise. 2. Start the engine and set at approx. 2500 min (rpm).
Page 375: Hydraulic Pump (For Power Steering, Bi-Speed Turn, Pto Clutch And Hst)
Test Preparation (For Power Steering, Bi-speed Turn, PTO Clutch and HST) IMPORTANT • When using a flowmeter other than KUBOTA specified flowmeter (Code No. 07916-52792), be sure to use the instructions with that flowmeter. • In this hook-up, there is no relief valve. Therefore while testing, do not close the flowmeter loading valve completely.
Page 376 B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM Hydraulic Pump Test (For Power Steering, Bi-speed Turn, PTO Clutch and HST) NOTE • Before pump testing, do the "Test Preparation". 1. Open flowmeter loading valve completely (Turn counterclockwise. 2. Start the engine and set at approx. 2500 min (rpm).
Page 377: 3-Points Hitch Relief Valve
B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM (3) 3-Points Hitch Relief Valve 3-Points Hitch Relief Valve Setting Pressure 1. Remove the seat under cover. 2. Remove the plug (1) from the hydraulic cylinder block (5). 3. Install the adaptor 58 (See page G-50.). Then connect the cable and the pressure gauge to the adaptor.
Page 378: Lift Arm
B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM (4) Lift Arm Lift Arm Free Play 1. Set the position control lever (1) to the lowest position. 2. Start the engine, and set at the idling speed. 3. Move the position control lever (1) to the uppermost position. 4.
Page 379 B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM Hydraulic Pump Cover, Side Plate and Gear 1. Secure the hydraulic pump with a vise, and remove the hydraulic pump cover (6) with casing (5). 2. Remove the side plate (4). 3. Remove the drive gear (3) and driven gear (2) from the casing (1).
Page 380: 3-Point Hitch
B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM (2) 3-Point Hitch 3-Point Hitch 1. Remove the top link. 2. Remove the lift rods. 3. Remove the check chains. 4. Remove the lower links. 5. Loosen the lock nut (6) and remove the set screw (5). 6.
Page 381: Separating Hydraulic Cylinder From Tractor Body (Cabin Model)
B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM Seat 1. Remove the seat (1). 2. Remove the seat support (2) and rear fender cover (3). (1) Seat (3) Rear Fender Cover (2) Seat Support 9Y1210982HYS0015US0 Separating Hydraulic Cylinder from Tractor Body 1.
Page 382: 3-Points Hitch: Hydraulic Cylinder
B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM Separating Hydraulic Cylinder from Tractor Body 1. Disconnect the hydraulic delivery pipe from hydraulic cylinder. 2. Remove the hydraulic cylinder. 9Y1210982HYS0020US0 (5) 3-Points Hitch: Hydraulic Cylinder Checking the Length of the Adjusting Bolt NOTE •...
Page 383 B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM Control Valve NOTE • When the control valve is installed in the hydraulic cylinder, the hexagon wrench is not aligned straight to the hexagon bolt without pushing the spool as shown in the picture.
Page 384 B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM Relief Valve [Manual Transmission Model (Without Front Loader Control Valve)] NOTE • Refer to the page 8-M6 for the relief valve [HST model (with front loader control valve)] 1. Remove the plug (2), and draw out the washer (7), the shim (6), the poppet (4) and the valve seat (3).
Page 385 B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM Hydraulic Piston 1. Inject the compressed air into the hydraulic cylinder, and remove the hydraulic piston (1). (When reassembling) • Take care not to damage the O-ring (3) and backup ring (2). • Apply transmission fluid to the O-ring. •...
Page 386: Front Loader Control Valve Assembly (If Equipped)
B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM Disassembling Position Control Valve 1. After removing the control valve, disassemble the component parts as shown in the picture. (When reassembling) • Readjust the length "L" of the adjusting bolt. (Reference) • Length "L" : approximately 10.70 mm (0.4213 in.) (1) External Cir-clip (15) Unload Poppet (2) Lever...
Page 387 B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM Front Loader Valve Assembly 1. Remove the brake rod (1). 2. Disconnect the 3-point hitch delivery pipe 1 (2), 3-point hitch delivery pipe 2 (4) and return hose (6). 3. Remove the loader valve assembly (3). 4.
Page 388 B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM Disassembling Front Loader Control Valve and Relief Valve [HST Model (With Front Loader Control Valve)] NOTE • Refer to the page 8-M7 for the relief valve [HST Model (With Front Loader Control Valve)] (1) Plug (2) O-ring (3) Washer...
Page 389: Remote Control Valve (If Equipped)
B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM (7) Remote Control Valve (If Equipped) Poppet and Piston (Mechanical Check Valve) 1. Remove the plug 1 (4) and draw out the spring (7), ball guide (3), balls (1), (6), poppet (2) and piston (5). (When reassembling) •...
Page 390 B2050, B2350, B2650, B3150, WSM HYDRAULIC SYSTEM Side Plate Thickness 1. Measure the side plate thickness with an outside micrometer. 2. If the thickness is less than the allowable limit, replace it. 2.48 to 2.50 mm Factory specification 0.0976 to 0.0984 in. Side plate thickness 2.40 mm Allowable limit...
Page 391 ELECTRICAL SYSTEM KiSC issued 03, 2014 A...
Page 392 MECHANISM CONTENTS 1. WIRING DIAGRAM........................9-M1 [1] ROPS MODEL (EXCEPT FOR B3150) ................9-M1 [2] B3150 ROPS ........................9-M2 [3] CABIN MODEL ........................9-M3 2. ENGINE STARTING SYSTEM AND STOPPING SYSTEM ............9-M4 [1] OPC SYSTEM CIRCUIT ...................... 9-M4 [2] CONTROLLER ........................9-M5 [3] SAFETY SWITCH ......................
Page 393: Wiring Diagram
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM 1. WIRING DIAGRAM [1] ROPS MODEL (EXCEPT FOR B3150) 9-M1 KiSC issued 03, 2014 A...
Page 394: B3150 Rops
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM [2] B3150 ROPS 9-M2 KiSC issued 03, 2014 A...
Page 395: Cabin Model
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM [3] CABIN MODEL 9-M3 KiSC issued 03, 2014 A...
Page 396: Engine Starting System And Stopping System
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM 2. ENGINE STARTING SYSTEM AND STOPPING SYSTEM Operator presence control (OPC) system which this series tractors are equipped with controls the engine starting and stopping according to the condition of safety switches (PTO clutch lever switch, PTO select lever switch, parking brake switch, seat switch, HST pedal switch and shuttle shift lever switch).
Page 397: Controller
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM [2] CONTROLLER Operator Presence Control (OPC) System This series tractor tractors are equipped with an "Operator Presence Control (OPC)" system to control engine starting and engine automatically stopping. This OPC system mainly consists of controller and engine starting / stopping control switches such as PTO clutch lever switch, PTO select lever switch, parking brake switch, seat switch, HST pedal switch and shuttle...
Page 398 B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM Controller Controller is located inside the panel board. Current from the key switch, safety switches and alternator L terminal flows to controller. Controller receives current as data, processes the data, and sends out current computing results to starter motor, relay (key stop solenoid), and key stop solenoid.
Page 399 B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM Engine Starting When the following conditions become complete, output voltage (12 V) reaches coil terminal of the starter motor from controller k terminal, the engine can be started. PTO Clutch Lever Switch (Disengaged : ON, Engaged : OFF) HST Pedal Switch (HST Model) Shuttle Shift Lever Switch (Manual Transmission Model)
Page 400 B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM One Second Delay Engine Shutting Off When one condition of the three patterns becomes complete, output voltage (12 V) to the relay (key stop solenoid) from controller j terminal will stop in one second delay.
Page 401 B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM Safety Switch Position and Engine Condition Model With Mid PTO HST Pedal Switch or PTO Select PTO Clutch Parking Brake Seat Switch Engine Start Engine Stop Shuttle Shift Lever Switch Lever Switch Switch Lever Switch Neutral Only Rear PTO...
Page 402: Safety Switch
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM Model Without Mid PTO HST Pedal Switch PTO Clutch Lever Parking Brake or Shuttle Shift Seat Switch Engine Start Engine Stop Switch Switch Lever Switch Neutral Disengaged Lock Engine Stop Cannot Start (ON) (ON) (ON) (ON)
Page 403: Pto Select Lever Switch (Only Model With Mid Pto)
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM (1) PTO Select Lever Switch (Only Model With Mid PTO) PTO Select Lever Switch (Only Model With Mid PTO) This switch locates at transmission case. This switch is a push type. This switch detects the position of the PTO select lever.
Page 404: Pto Clutch Lever Switch
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM (2) PTO Clutch Lever Switch PTO Clutch Lever Switch This switch is a push type. This switch detects the PTO clutch engagement. When clutch lever "DISENGAGED" position, this switch is turned to "ON". When the PTO clutch lever is set to "ENGAGED"...
Page 405: Shuttle Shift Lever Switch (Manual Transmission Model)
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM (4) Shuttle Shift Lever Switch (Manual Transmission Model) Shuttle Shift Lever Switch (Manual Transmission Model) This switch is a push type. This switch detects the position of the shuttle shift lever. When the shuttle sift lever is at "NEUTRAL" position, this switch is turned to "ON".
Page 406: Starter
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM [4] STARTER (1) Housing (2) Magnetic Switch (3) Overrunning Clutch (4) Drive Lever (5) Internal Gear (6) Gear Shaft (7) Planetary Gear (8) Armature Shaft (9) Yoke (10) Brush Holder (11) Rear End Frame The starter is a reduction type.
Page 407: Glow Plug
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM [6] GLOW PLUG This plug is a two-material type QGS (Quick Glow System) quick temperature rise, self-controlling function as well as excellent durability. The heater (4) connected in series to the heater (3), which also functions as the resistor, is incorporated in the sheath tube (1) of the super glow plug.
Page 408: Charging System
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM 3. CHARGING SYSTEM Charging System Circuit (ROPS Model) (1) Battery (2) Slow Blow Fuse (Main) (3) Alternator (4) Key Switch (5) Fuse (Alternator / ACC Relay) (6) Relay (Charge) (7) Instrument Panel (8) OPC Controller The charging system supplies electric power for various electrical devices and also charges the battery while the engine operates.
Page 409: Alternator
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM Charging System Circuit (CABIN Model) (1) Battery (2) Slow Blow Fuse (Main) (3) Alternator (4) Key Switch (5) Fuse (Alternator / ACC Relay) (6) Relay (Charge) (7) Instrument Panel (8) OPC Controller The charging system supplies electric power for various electrical devices and also charges the battery while the engine operates.
Page 410: Ic Regulator
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM [2] IC REGULATOR (1) Alternator (2) Rectifier (3) Stator Coil (4) Rotor Coil (5) IC Regulator (6) Charge Lamp (7) Main Switch (8) Battery (9) Load An IC regulator uses solid state transistors, chips or other semiconductor elements instead of the relays in a conventional regulator.
Page 411: Lighting System
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM 4. LIGHTING SYSTEM [1] HEAD LIGHT ROPS Model (1) Battery (6) Relay (Head Light 1) (10) Rear Combination Lamp (R) (15) Head Light (R) (2) Slow Blow Fuse (Main) (7) Instrument Panel (Position) (16) Front Combination Lamp (L) (3) Key Switch (8) Combination Switch (Head...
Page 412 B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM CABIN Model (1) Battery (6) Relay (Head Light 1) (10) Rear Combination Lamp (R) (15) License Lamp (2) Slow Blow Fuse (Main) (7) Instrument Panel (Position) (16) Front Combination Lamp (L) (3) Key Switch (8) Combination Switch (Head (11) Relay (Head Light 2) (Position)
Page 413: Turn Signal Light
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM [2] TURN SIGNAL LIGHT ROPS Model (1) Battery (2) Slow Blow Fuse (Main) (3) Key Switch (4) Fuse (Alternator / ACC Relay) (5) Fuse (Flasher / Hazard) (6) Flasher Unit (7) Instrument Panel (8) Combination Switch (Turn Signal) (9) Trailer Socket...
Page 414 B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM Combination Switch (ROPS Model) Combination switch consist of head light switch, turn signal light switch and horn switch. Head Light Switch Turn Signal Light Switch Hazard Switch (1) Combination Switch 9Y1210982ELM0030US0 Combination Switch (CABIN Model) Combination switch consist of head light switch, turn signal light switch and horn switch.
Page 415: Hazard Light
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM [3] HAZARD LIGHT ROPS Model (1) Battery (6) Flasher Unit (10) Rear Combination Lamp (L) (12) Front Combination Lamp (L) (2) Slow Blow Fuse (Main) (7) Instrument Panel (Turn) (Turn) (3) Key Switch (8) Hazard Switch (11) Rear Combination Lamp (R) (13) Front Combination Lamp (R)
Page 416 B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM CABIN Model (1) Battery (6) Fuse (Head Light / Position (10) Combination Switch (Head (13) Trailer Socket (2) Slow Blow Fuse (Main) Lamp / Horn) Light) (14) Hazard Switch (3) Key Switch (7) Relay (Head Light 1) (11) Rear Combination Lamp (L) (15) Front Combination Lamp (L) (4) Fuse (Alternator / ACC Relay)
Page 417: Beacon
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM Hazard Switch (CABIN Model) NOTE • Refer to the page 9-S26 for the hazard switch (CABIN Model) This is a pushing type switch to turn on the hazard lights. The lamp (2) in the switch is lighted up by the current from outside of the switch.
Page 418 B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM CABIN Model (1) Battery (2) Slow Blow Fuse (Main) (3) Key Switch (4) Fuse (Alternator / ACC Relay) (5) Fuse (Flasher / Hazard) (6) Fuse (Beacon) (7) Relay (Head Light 1) (8) Flasher Unit (9) Beacon Switch (10) Beacon 9Y1210982ELM0036US0...
Page 419: Brake Light
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM [5] BRAKE LIGHT ROPS Model (1) Battery (2) Slow Blow Fuse (Main) (3) Key Switch (4) Fuse (Alternator / ACC Relay) (5) Fuse (Blake Lamp) (6) Relay (Head Light 1) (7) Brake Lamp Switch (8) Trailer Socket (9) Rear Combination Lamp (L) (Brake)
Page 420: Work Light (Cabin Model Only)
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM Brake Lamp Switch Brake lamp switch is turned on by pushing a brake pedal and turned off by releasing it. 9Y1210982ELM0040US0 [6] WORK LIGHT (CABIN MODEL ONLY) CABIN Model (1) Battery (6) Fuse (Head Light / Position (10) Combination Switch (Head (13) Front Work Light (R) (2) Slow Blow Fuse (CABIN)
Page 421: Trailer Socket
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM [7] TRAILER SOCKET The trailer socket is provided to remove the electrical power from tractor to trailer or implement. The function of each terminal is shown below. Terminal Function Color of wire harness Turn signal (L) Green / White –...
Page 422: Instrument Panel
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM 5. INSTRUMENT PANEL [1] EASY CHECKER™ ROPS Model If the warning lamps of the Easy Checker™ come on during operation, immediately stop the engine, and find the cause as shown below. Never operate the machine while Easy Checker™ lamp is on.
Page 423: Gauges And Other Indicators
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM [2] GAUGES AND OTHER INDICATORS ROPS Model (1) Coolant Temperature Gauge (3) Bi-speed Turn Indicator (2) Fuel Gauge 9Y1210982ELM0045US0 9-M31 KiSC issued 03, 2014 A...
Page 424 B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM CABIN Model The engine speed / PTO speed indicator (3) indicates the engine speed or the PTO speed selectively. The engine speed / PTO speed indicator (3) shows "Engine Speed" as default when the main switch is turned ON.
Page 425: Error Code Display (Cabin Model Only)
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM [3] ERROR CODE DISPLAY (CABIN MODEL ONLY) If trouble should occur at the instrument panel error code appears as a warning. If the trouble is not corrected by restarting the machine, solve the problem according to the following table.
Page 426 B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM Coolant Temperature Sensor (ROPS Model) The coolant temperature sensor is installed to the cylinder head of engine, and its tip is in touch with the coolant. It contains a thermistor (4) whose electrical resistance decreases as the temperature increases.
Page 427 B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM Bi-speed Turn Switch This switch is a push type. This switch detects the position of the bi-speed turn lever. When the bi-speed turn lever is at "Bi-speed turn 4WD" position, this switch is turned to "ON". When the bi-speed turn lever is at "Normal 4WD"...
Page 428 SERVICING CONTENTS 1. TROUBLESHOOTING.........................9-S1 2. SERVICING SPECIFICATIONS ....................9-S7 3. TIGHTENING TORQUES......................9-S8 4. CHECKING AND ADJUSTING....................9-S9 [1] BATTERY ..........................9-S9 [2] FUSE ...........................9-S10 [3] RELAYS ..........................9-S11 (1) Relays (ROPS Model) ....................9-S11 (2) Relays (CABIN Model) ....................9-S13 [4] STARTING SYSTEM......................9-S15 (1) Key Switch........................9-S15 (2) Safety Switches ......................9-S17 (3) OPC Controller ......................9-S18 (4) Key Stop Solenoid ......................9-S18...
Page 429: Troubleshooting
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM 1. TROUBLESHOOTING FUSE AND WIRING Reference Symptom Probable Cause and Checking Procedure Solution Page All Electrical 1. Battery discharged or damaged Check or recharge 9-S10 Equipment Do Not battery Operate 2. Battery positive cable disconnected or Repair or replace 9-S9 improperly connected...
Page 430 B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM Reference Symptom Probable Cause and Checking Procedure Solution Page Pre-heat indicator 1. Battery discharged or damaged Recharge or replace 9-S10 Lamp Does Not Light battery When Main Switch Is 2. Slow blow fuse blown Repair glow harness 9-M1 to in Pre-heat Position...
Page 431 B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM Reference Symptom Probable Cause and Checking Procedure Solution Page Starter Motor Does 1. Solenoid fuse blown (30 A) Replace wire harness 9-M1 to Not Operate or other 9-M3 2. Key stop solenoid damaged Check key stop 9-S18 solenoid...
Page 432 B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM CHARGING SYSTEM Reference Symptom Probable Cause and Checking Procedure Solution Page Charging Lamp Does 1. Fuse blown (10 A) Replace wire harness G-40, Not Light when Main or other 9-M1 to Switch is Turned ON 9-M3 2.
Page 433 B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM Reference Symptom Probable Cause and Checking Procedure Solution Page Hazard Light (Tail 1. Fuse blown (15 A) Repair wire harness G-40, Light) Does Not Light or other 9-M1 to 9-M3 2. Bulb blown Replace bulb G-41 3.
Page 434 B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM EASY CHECKER™ Reference Symptom Probable Cause and Checking Procedure Solution Page Oil Pressure Lamp 1. Engine oil insufficient Check engine oil Lights Up When 2. Engine oil pressure too low Solution order 9-S34 Engine Operates 1.
Page 435: Servicing Specifications
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Battery Voltage More than 12 V – Potential Less than 0.1 V – Difference Glow Plug Resistance Approx. 0.9 Ω – Coolant Temperature Sensor Resistance (ROPS Model) at 130 °C (266 °F) Approx.
Page 436 B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts: See page G-10.) Item N·m kgf·m lbf·ft Coolant temperature sensor (ROPS Model) 11.8 to 17.6 1.20 to 1.80 8.68 to 13.0...
Page 437: Checking And Adjusting
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM 4. CHECKING AND ADJUSTING CAUTION • To avoid accidental short circuit, be sure to attach the positive cable to the positive terminal before the negative cable is attached to the negative terminal. • Never remove the battery cap while the engine operates. •...
Page 438: Fuse
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM Recharging CAUTION • When the battery is being activated, hydrogen and oxygen gases in the battery are extremely explosive. Keep open sparks and flames away from the battery at all times, especially when charging the battery. •...
Page 439: Relays
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM [3] RELAYS (1) Relays (ROPS Model) AUX, Head Light 1 and Engine Stop Solenoid (ROPS Model) 1. Remove the relay. 2. Apply battery voltage across 2 terminal and 4 terminal, and check for continuity across 1 terminal and 3 terminal. 3.
Page 440 B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM Charge and Head Light 2 (ROPS Model) 1. Remove the relay. 2. Apply battery voltage across 1 terminal and 2 terminal, and check for continuity across 3 terminal and 4 terminal. 3. If 0 Ω is not indicated, renew the relay. Battery voltage is applied 3 terminal –...
Page 441: Relays (Cabin Model)
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM (2) Relays (CABIN Model) AUX, Head Light 1 and Engine Stop Solenoid (CABIN Model) 1. Remove the relay. 2. Apply battery voltage across 2 terminal and 4 terminal, and check for continuity across 1 terminal and 3 terminal. 3.
Page 442 B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM Charge, Head Light 2, Horn, Work Light and Defogger (CABIN Model) 1. Remove the relay. 2. Apply battery voltage across 1 terminal and 2 terminal, and check for continuity across 3 terminal and 4 terminal. 3.
Page 443: Starting System
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM Relay (Glow) (CABIN Model) 1. Remove the relay. 2. Apply battery voltage across 2 terminal and 4 terminal, and check for continuity across 1 terminal and 3 terminal. 3. If 0 Ω is not indicated, renew the relay. (1) Relay (Glow) 9Y1210982ELS0016US0 [4] STARTING SYSTEM...
Page 444 B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM 2) Key Switch Key at "ON" Position 1. Set the key switch ON position. 2. Measure the resistance with an ohmmeter across the B terminal and the AC terminal. 3. If 0 Ω is not indicated, the B - AC contact of the key switch are damaged.
Page 445: Safety Switches
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM (2) Safety Switches Safety Switch Continuity 1. Disconnect the safety switch leads or couplers. 2. Connect the circuit tester to the safety switch leads. 3. Measure the resistance between leads. 4. If the safety switch is damaged, replace it. Safety switch Condition Resistance...
Page 446: Opc Controller
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM (3) OPC Controller OPC Controller 1. Check the "Engine Starting Conditions" and "Automatic Engine Stop Conditions". (See page 9-M4.) 2. If the tractor does not operate appropriately, check all parts according to the "1.TROUBLESHOOTING" section. 3.
Page 447: Starter
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM (5) Starter Motor Test CAUTION • Secure the starter to prevent it from jumping up and down while testing the motor. 1. Disconnect the battery negative cable from the battery. 2. Disconnect the battery positive cable and the leads from the starter B terminal.
Page 448: Glow Plug
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM (6) Glow Plug Lead Terminal Voltage 1. Disconnect the wiring lead (1) from the glow plug (2) after turning the main switch OFF. 2. Turn the main switch key to the PREHEAT position, and measure the voltage between the lead terminal and the chassis.
Page 449: Charging System
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM [5] CHARGING SYSTEM (1) Alternator Connector Voltage 1. Turn the main switch OFF. Measure the voltage between the B terminal (1) and the chassis. 2. Turn the main switch ON. Measure the voltage between the IG terminal (3) and the chassis.
Page 450: Lighting System
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM [6] LIGHTING SYSTEM (1) Combination Switch (ROPS Model) Combination Switch (ROPS Model) 1. Remove the steering wheel and panel lower cover. 2. Disconnect the combination switch connector. 3. Remove the combination switch (1) and perform the following checks 1) to 8).
Page 451 B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM 4) Turn Signal Light Switch Continuity When Setting Switch Knob OFF Position 1. Set the turn signal light switch to the OFF position. 2. Measure the resistance with an ohmmeter across the B3 terminal and TL terminal, the B3 terminal and TR terminal.
Page 452: Combination Switch (Cabin Model)
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM (2) Combination Switch (CABIN Model) Combination Switch (CABIN Model) 1. Remove the steering wheel and panel lower cover. 2. Disconnect the combination switch connector. 3. Remove the combination switch (1) and perform the following checks 1) to 8).
Page 453 B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM 4) Turn Signal Light Switch Continuity When Setting Switch Knob OFF Position 1. Set the turn signal light switch to the OFF position. 2. Measure the resistance with an ohmmeter across the B2 terminal and L terminal, the B2 terminal and R terminal.
Page 454: Hazard Switch (Cabin Model Only)
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM (3) Hazard Switch (Cabin Model Only) NOTE • Refer to the page 9-M25 for the hazard switch (CABIN model). (1) Hazard Switch 9Y1210982ELS0050US0 Connector Voltage 1. Connect the battery negative code, then measure the voltage with a voltmeter across the a terminal and chassis.
Page 455: Beacon Switch
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM (4) Beacon Switch (1) Beacon Switch [A] ROPS Model [B] CABIN Model 9Y1210982ELS0053US0 Connector Voltage 1. Connect the battery negative code, then measure the voltage with a voltmeter across the a terminal and chassis. 2.
Page 456: Flasher Unit
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM (5) Flasher Unit Supply Voltage to Flasher Unit 1. Disconnect the connector from the flasher unit. 2. Measure the voltage between the terminal 7, 8 and chassis. 3. If the voltage differ from the battery voltage, the wiring harness is damaged.
Page 457: Brake Lamp Switch
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM (6) Brake Lamp Switch Brake Lamp Switch Continuity 1. Disconnect the switch leads or coupler. 2. Connect the circuit tester to the switch leads. 3. Measure the resistance between leads. 4. If the switch is damaged, replace it. When brake lamp Infinity switch is not pushed...
Page 458: Work Light Switch (Cabin Model Only)
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM (7) Work Light Switch (CABIN Model Only) Work Light Switch 1. Remove the meter panel lower cover and disconnect the 6P connector from work light switch (1). 2. Remove the work light switch (1). 3.
Page 459: Dome Light (Cabin Model Only)
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM (8) Dome Light (CABIN Model Only) Connector Voltage 1. Disconnect the connector. 2. Measure the voltage with a voltmeter across the terminals shown in the table below. 3. If the reference value is not indicated as shown in the table below, check the relating electric circuit.
Page 460: Warning Lamp, Indicator Lamp And Gauge
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM [7] WARNING LAMP, INDICATOR LAMP AND GAUGE (1) Instrument Panel (ROPS Model) Connector Voltage (1) Instrument Panel (2) Connector (Panel) (3) Connector (Wire Harness) (4) Oil Switch Lamp (5) Charge Lamp (6) Turn Signal Lamp (R) (7) Glow Lamp (8) Illumination Lamp (9) Bi-speed Turn Indicator Lamp...
Page 461: Instrument Panel (Cabin Model)
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM (2) Instrument Panel (CABIN Model) Arrangement of Digital Display Connector Pin [Connector 1] Terminal Color of Item wiring Blank – Bi-speed Turn Indicator 3 to 5 Blank – L Terminal (Charge) Blank – Position 9 to 10 Blank...
Page 462: Engine Oil Pressure Switch
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM Connector Voltage 1. Disconnect the connector of connector 2 side. 2. Measure the voltage between terminal 15 (+) (Yellow/Blue) and terminal 11 (−) (Black). 3. Turn the main key switch ON. 4. Measure the voltage between terminal 16 (+) (Brown) and terminal 11 (−) (Black).
Page 463: Coolant Temperature Sensor (Rops Model)
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM (4) Coolant Temperature Sensor (ROPS Model) Coolant Temperature Sensor (ROPS Model) 1) Lead Terminal Voltage 1. Disconnect the lead from the coolant temperature sensor after turning the main switch OFF. 2. Turn the main switch ON and measure the voltage with a voltmeter across the lead terminal and the chassis.
Page 464: Coolant Temperature Sensor (Cabin Model)
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM (5) Coolant Temperature Sensor (CABIN Model) Connector Voltage 1. Disconnect the connector and turn the key switch "ON" position. 2. Measure the voltage with a voltmeter across the terminals shown in the table below. 3.
Page 465: Fuel Sensor
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM (6) Fuel Sensor Fuel Sensor 1) Connector Voltage 1. Disconnect the connector and turn the key switch "ON" position. 2. Measure the voltage with a voltmeter across the terminals shown in the table below. 3.
Page 466: Engine Rotation Sensor (Cabin Model Only)
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM (8) Engine Rotation Sensor (CABIN Model Only) Connector Voltage 1. Disconnect the connector, and turn the key switch "ON" position. 2. Measure the voltage with a voltmeter across the terminals shown in the table below. 3.
Page 467: Display Switch
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM (9) Display Switch Display Switch Continuity 1. Disconnect the wiring leads from display switch and remove it. 2. Measure the resistance with an ohmmeter across the display switch terminals in each position. 3. If the resistance differs from the factory specifications, the display switch is damaged.
Page 468: Disassembling And Assembling
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM 5. DISASSEMBLING AND ASSEMBLING [1] STARTER (1) Screw (2) Front Bracket (3) Magnetic Switch (4) Overrunning Clutch (5) Drive Lever (6) Internal Gear (7) Shaft (8) Planetary Gear (9) Shaft Assembly (10) Ball (11) Gasket (12) Yoke (13) Armature...
Page 469 B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM Rear End Cover 1. Remove the three rear end cover screws and the B terminal nut, and remove the rear end cover. 9Y1210982ELS0077US0 Brush Holder 1. Remove the two screws holding the brush holder, and remove the brush holder (1).
Page 470 B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM Rotor 1. Press out the rotor (1) from drive end frame (3). IMPORTANT • Take special care not to drop the rotor and damage the slip ring or fan, etc.. (1) Rotor (3) Drive End Frame (2) Block 9Y1210982ELS0082US0 Retainer Plate...
Page 471: Servicing
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM 6. SERVICING [1] STARTER Commutator and Mica 1. Check the contact face of the commutator for wear, and grind the commutator with emery paper if it is slightly worn. 2. Measure the commutator O.D. with an outside micrometer at several points.
Page 472: Alternator
B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM Armature Coil 1. Check the continuity between the commutator and armature coil core with an ohmmeter. 2. If it conducts, replace the armature. 3. Check the continuity between the segments of the commutator with an ohmmeter.
Page 473 B2050, B2350, B2650, B3150, WSM ELECTRICAL SYSTEM Slip Ring 1. Check the slip ring for score. 2. If scored, correct with an emery paper or on a lathe. 3. Measure the O.D. of slip ring with vernier calipers. 4. If the measurement is less than the allowable limit, replace it. 14.4 mm Factory specification 0.567 in.
Page 474 CABIN KiSC issued 03, 2014 A...
Page 475 MECHANISM CONTENTS 1. OUTLINE OF AIR CONDITIONING SYSTEM................10-M1 [1] STRUCTURE ........................10-M1 [2] AIR CONDITIONING SYSTEM ..................10-M3 2. REFRIGERATION SYSTEM ....................10-M4 [1] COMPRESSOR........................10-M4 (1) Pressure Relief Valve ....................10-M5 (2) Magnetic Clutch......................10-M5 [2] CONDENSER........................10-M6 [3] RECEIVER .........................
Page 476: Outline Of Air Conditioning System
B2050, B2350, B2650, B3150, WSM CABIN 1. OUTLINE OF AIR CONDITIONING SYSTEM [1] STRUCTURE (1) Heater Hose (Outside) (5) Outside Air Filter (9) Side Air Outlet (13) Compressor (2) Heater (Inside) (6) Inside Air Filter (10) Receiver (14) High Pressure Pipe (3) Water Valve (7) Inner Roof (11) Pressure Switch...
Page 477 B2050, B2350, B2650, B3150, WSM CABIN (Continued) The machine is equipped with a thin large-capacity air conditioner with outside air intake. Air pulled from the inside air filter (6) as well as the outside air filter (5), passes through the roof (7) and reaches the air conditioner unit (16). The air is then cooled and dehumidified by this unit.
Page 478: Air Conditioning System
B2050, B2350, B2650, B3150, WSM CABIN [2] AIR CONDITIONING SYSTEM (1) Heater Core (2) Evaporator (3) Blower Motor (4) Engine Cooling Fan (5) Compressor (6) Condenser (7) Receiver (8) Desiccant (9) Pressure Switch (10) Expansion Valve Cooled air Low pressure/low temperature gas-liquid mixture (mist) refrigerant Low pressure/low...
Page 479: Refrigeration System
B2050, B2350, B2650, B3150, WSM CABIN 2. REFRIGERATION SYSTEM [1] COMPRESSOR The vane type compressor installed on this cabin consists of a cylinder (1) with an oval cross section and a rotor (2) with five vanes (3). The vane type compressor is provided with two suction ports and two discharge ports respectively.
Page 480: Pressure Relief Valve
B2050, B2350, B2650, B3150, WSM CABIN (1) Pressure Relief Valve If the high pressure is abnormally high, the pressure relief valve (1) opens to protect the circuit. Even in the worst case, the outflow of refrigerant is stopped at the minimum limit. (Reference) •...
Page 481: Condenser
B2050, B2350, B2650, B3150, WSM CABIN [2] CONDENSER The condenser (1) is installed in the front of the radiator to enable forced cooling by the air drawn in by the engine radiator fan. The condenser is used for the purpose of cooling by robbing the heat from the refrigerant gas, which has been compressed by the compressor into high temperature, high pressure gas, and change this gas...
Page 482: Receiver
B2050, B2350, B2650, B3150, WSM CABIN [3] RECEIVER The receiver serves the purpose of storing the liquid refrigerant. The amount of liquid refrigerant flowing through the system varies with the operating condition of the air conditioner. To be accurate, the receiver stores excess refrigerant when the heat load is lowered.
Page 483: Air Conditioner Unit
B2050, B2350, B2650, B3150, WSM CABIN [4] AIR CONDITIONER UNIT The air conditioner unit consists of evaporator (2), expansion valve (3), heater core (4), blower (1). etc.. (1) Blower (3) Expansion Valve (2) Evaporator (4) Heater Core 9Y1210982CAM0010US0 Expansion Valve The expansion valve regulates the amount of liquid refrigerant that passes through the valve.
Page 484: Evaporator
B2050, B2350, B2650, B3150, WSM CABIN A/C Blower The blower is incorporated in the left-hand space of the air conditioner unit. It blows cool, warm of fresh air via the dashboard and defroster blow ports into the cabin. The speed of the blower motor (2) can be adjusted in 4 steps by the resistor (3).
Page 485: Heater Core
B2050, B2350, B2650, B3150, WSM CABIN (2) Heater Core The heater utilizers the heater core to absorb heat from the coolant, which has removed heat from the engine. The inlet port of heater core is connected to the delivery side of the engine water pump by a rubber hose. The water valve is installed on the inlet port of the heater core.
Page 486: System Control
B2050, B2350, B2650, B3150, WSM CABIN 3. SYSTEM CONTROL (1) Temperature Control Dial (7) Recirculated Air (12) Air Outlet Door D3 (A) Control Plate (2) Mode Switch (8) Blower (Mode Door) (B) Air Selection Lever (3) Blow Switch (9) Evaporator (13) DEFOGGER (C) Block Diagram of Air Flow (4) Air Conditioner Switch with...
Page 487: Electrical System
B2050, B2350, B2650, B3150, WSM CABIN 4. ELECTRICAL SYSTEM [1] ELECTRICAL CIRCUIT (1) Battery (7) Fuse (13) Compressor (18) Thermostat (2) Slow Blow Fuse (8) Front Wiper Switch (14) A/C Control Amplifter (19) Mode Switch Servo Motor (3) For CABIN Line (9) Rear Wiper Switch (15) Blower Switch (20) Thermostatic Servo Motor...
Page 488: Relay
B2050, B2350, B2650, B3150, WSM CABIN [2] RELAY Remove the outer roof and the relays are visible at the ceiling rear of the cabin: blower relay (1) and compressor relay (2). When the blower fan is adjusted for the air flow rate, the blower relay (1) is activated by a signal from the fan switch on the control panel.
Page 489 B2050, B2350, B2650, B3150, WSM CABIN  Color of wiring Item Terminal No. Color of Wiring Blower Relay Compressor Relay (1) Connector (Wire Harness) 9Y1210982CAM0019US0 10-M14 KiSC issued 03, 2014 A...
Page 490 SERVICING CONTENTS 1. TROUBLESHOOTING.......................10-S1 2. SERVICING SPECIFICATIONS ....................10-S5 3. TIGHTENING TORQUES......................10-S6 4. PRECAUTIONS AT REPAIRING REFRIGERANT CYCLE............10-S7 [1] HANDLING OF SERVICE TOOLS ..................10-S9 (1) Manifold Gauge Set.......................10-S9 (2) Refrigerant Charging Hose..................10-S10 (3) Vacuum Pump Adaptor ....................10-S11 (4) Electric Gas Leak Tester .....................10-S11 (5) Can Tap Valve......................10-S11 (6) T-joint...........................10-S12 (7) R134a Refrigerant Recovery and Recycling Machine..........10-S12...
Page 491: Troubleshooting
B2050, B2350, B2650, B3150, WSM CABIN 1. TROUBLESHOOTING COMPRESSOR Reference Symptom Probable Cause and Checking Procedure Solution Page Noisy 1. Bearing of compressor worn or damaged Replace compressor 10-S36 (Compressor ON) 2. Valves in compressor damaged Replace compressor 10-S36 3. Belt slipping Adjust or replace 10-S22 V-belt...
Page 492 B2050, B2350, B2650, B3150, WSM CABIN Reference Symptom Probable Cause and Checking Procedure Solution Page Insufficient Cooling 1. Insufficient refrigerant Check with manifold 10-S13 (Many Bubbles in gauge Sight Glass) 2. Gas leaking from some place in refrigerating Repair and charge 10-S21 cycle refrigerant...
Page 493 B2050, B2350, B2650, B3150, WSM CABIN Reference Symptom Probable Cause and Checking Procedure Solution Page Insufficient Cooling 1. Low battery voltage Charge battery 9-S10 (Compressor 2. Rotor in contact with stator Replace rotor 10-S37 Magnetic Clutch 3. Wrong wiring loose connections Check and repair 9-M1 to Does Not Work)
Page 494 B2050, B2350, B2650, B3150, WSM CABIN Reference Symptom Probable Cause and Checking Procedure Solution Page Temperature Cannot 1. Cable wrongly set Repair cable 10-S39 be Controlled (Water 2. Cable disconnected Repair cable 10-S39 Valve Does Not Open Properly) Temperature Cannot 1.
Page 495: Servicing Specifications
B2050, B2350, B2650, B3150, WSM CABIN 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Refrigerating Cycle Pressure 0.15 to 0.20 MPa – (Refrigerating Cycle is Normal Operating) (LO Pressure Side) 1.5 to 2.0 kgf/cm 21 to 28 psi Pressure 1.27 to 1.66 MPa –...
Page 496 B2050, B2350, B2650, B3150, WSM CABIN 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts: See page G-10.) Item N·m kgf·m lbf·ft Rear wheel mounting nut [B3150] 167 to 191 17 to 19.5 123 to 141...
Page 497: Precautions At Repairing Refrigerant Cycle
B2050, B2350, B2650, B3150, WSM CABIN 4. PRECAUTIONS AT REPAIRING REFRIGERANT CYCLE When checking or repairing the air conditioning system, the following precautions and rules must be observed. And it is of first importance that no other personnel than a well-trained serviceman should be allow to handle the refrigerant.
Page 498 B2050, B2350, B2650, B3150, WSM CABIN (Continued) (Refrigerant) R134a Kinds of refrigerant Factory specification 650 to 710 g (Charge amount) 1.44 to 1.56 lbs (Compressor Oil) Quantity (Total) Brand Name 110 to 120 cc ND-OIL 8 0.116 to 0.126 U.S.qts <PAG* oil>...
Page 499: Handling Of Service Tools
B2050, B2350, B2650, B3150, WSM CABIN [1] HANDLING OF SERVICE TOOLS (1) Manifold Gauge Set The hand valves on the manifold gauge set are used to open and close the valve. The hand valve inscribed LO is for the low pressure side valve (3) and HI is for the high pressure side valve (4).
Page 500: Refrigerant Charging Hose
B2050, B2350, B2650, B3150, WSM CABIN (2) Refrigerant Charging Hose The charging hoses are classified into three colors. Each charging hose must be handled as follows: • The air conditioner manufacture recommends that the blue hose (3) is used for the LO pressure side (suction side), the green hose (5) for refrigeration side (center connecting port) and the red hose (4) for HI pressure side (discharged side).
Page 501: Vacuum Pump Adaptor
B2050, B2350, B2650, B3150, WSM CABIN (3) Vacuum Pump Adaptor Objective of the Vacuum Pump Adaptor 1. After vacuum has been created in the air conditioning cycle, when the vacuum pump is stopped, since there is vacuum in hoses within the gauge manifold, the vacuum pump oil flows back into the charging hose.
Page 502: T-Joint
B2050, B2350, B2650, B3150, WSM CABIN (6) T-joint T-joint (2) is used to increase efficiency of gas charging using two refrigerant containers (4) at a time. 1. Install two refrigerant container service valves to T-joint (2) sides and connect the charging hose (1) to it. (1) Charging Hose (Green) (3) Can Tap Valve (2) T-joint...
Page 503: Checking And Charging Refrigerant Cycle
B2050, B2350, B2650, B3150, WSM CABIN 5. CHECKING AND CHARGING REFRIGERANT CYCLE [1] CHECKING WITH MANIFOLD GAUGE IMPORTANT • The gauge indications described in the following testing are those taken under the same condition, so it should be noted that the gauge readings will differs somewhat with the ambient conditions. Condition •...
Page 504 B2050, B2350, B2650, B3150, WSM CABIN Insufficient Refrigerant 1. Symptoms seen in refrigerating cycle • Both LO and HI pressure side (1), (2) pressures too low. LO pressure side (1): 0.05 to 0.1 MPa (0.5 to 1.0 kgf/cm , 7.1 to 14.2 psi) HI pressure side (2): 0.69 to 0.98 MPa (7 to 10 kgf/cm , 99.6 to 142.2 psi)
Page 505 B2050, B2350, B2650, B3150, WSM CABIN Moisture Entered in the Cycle 1. Symptoms seen in refrigerating cycle • The air conditioner operates normally at the beginning, but over time, LO pressure side (1) pressure is vacuum and HI pressure side (2) is low pressure. LO pressure side (1): Vacuum HI pressure side (2): 0.69 to 0.98 MPa (7 to 10 kgf/cm...
Page 506 B2050, B2350, B2650, B3150, WSM CABIN Expansion Valve Opens Too Far or Improper Installation of Heat Sensitizing Tube 1. Symptoms seen in refrigerating cycle • Both LO and HI pressure side (1), (2) pressures too high. LO pressure side (1): 0.29 to 0.39 MPa (3.0 to 4.0 kgf/cm , 42.71 to 56.9 psi) HI pressure side (2):...
Page 507: Discharging, Evacuating And Charging
B2050, B2350, B2650, B3150, WSM CABIN [2] DISCHARGING, EVACUATING AND CHARGING IMPORTANT • When discharging, evacuating or charging the refrigerating system, be sure to observe the "PRECAUTION AT REPAIRING REFRIGERANT CYCLE". 9Y1210982CAS0027US0 (1) Discharging the System Discharging R134a Refrigerant Prepare for the R134a refrigerant recovery and recycling machine.
Page 508: Evacuating The System
B2050, B2350, B2650, B3150, WSM CABIN (2) Evacuating the System 1. Discharge refrigerant from the system by R134a refrigerant recovery and recycling machine. (See page 10-S17.) 2. Connect the charging hose (red) to the HI pressure side charging valve and connect the charging hose (blue) to the LO pressure side charging valve.
Page 509: Charging The System
B2050, B2350, B2650, B3150, WSM CABIN (3) Charging the System Charging an Empty System (Liquid) This procedure is for charging an empty system through the HI pressure side with the refrigerant in the liquid state. CAUTION • Never run the engine when charging the system through the HI pressure side.
Page 510 B2050, B2350, B2650, B3150, WSM CABIN Charging an Empty or Partially Charged System (Vapor) This procedure is to charge the system through the LO pressure side with refrigerant in the vapor state. When the refrigerant container is set right side up, refrigerant will enter the system as a vapor.
Page 511: Checking Charging Refrigerant Amount
B2050, B2350, B2650, B3150, WSM CABIN (4) Checking Charging Refrigerant Amount After charging the refrigerant, check for amount of charging refrigerant as follows. NOTE • The pressure on the following checking are the gauge indications at ambient temperature 30 °C (86 °F), so it should be noted that the pressure will differ some what with the ambient temperature.
Page 512: Checking, Disassembling And Servicing
B2050, B2350, B2650, B3150, WSM CABIN 6. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING (1) Compressor Operation of Magnetic Clutch 1. Turn off the A/C switch after starting the engine. 2. Check whether abrasion or abnormal noise is heard when only the magnetic clutch pulley operates.
Page 513: Control Panel (Blower Switch, A/C Switch, Mode Control Dial And Temperature Control Dial)
B2050, B2350, B2650, B3150, WSM CABIN (2) Control Panel (Blower Switch, A/C Switch, Mode Control Dial and Temperature Control Dial) Blower Switch Connector Voltage 1. Disconnect the 6P connector (2) from blower switch. 2. Turn the main switch to "ON" position. 3.
Page 514 B2050, B2350, B2650, B3150, WSM CABIN Connector Voltage 1. Disconnect the 16P connector (2) from control panel switch. 2. Turn the main switch to "ON" position. 3. Measure the voltage with a voltmeter across the terminal o and terminal a. 4.
Page 515: Blower Resistor
B2050, B2350, B2650, B3150, WSM CABIN Temperature Control Dial Checking 1. Turn the temperature control dial counterclockwise till it stops (at "COOL" position). 2. Measure the voltage with a voltmeter across the terminal b and terminal d. Make the following measurement with the terminals connected.
Page 516: Blower Motor
B2050, B2350, B2650, B3150, WSM CABIN (4) Blower Motor Blower Motor Test 1. Remove the outer roof. 2. Turn the blower motor (1) by hand and check whether it turns smoothly. 3. Disconnect the 2P connector (2) of blower motor (1). 4.
Page 517: Mode Motor
B2050, B2350, B2650, B3150, WSM CABIN (6) Mode Motor Mode Motor Checking 1. Make sure whether the mode switch (2) is damaged. 2. Turn the main switch to "ON" position. 3. Turn the blower switch at 1 position. 4. Turn the mode switch each (a), (b) and (c). 5.
Page 518: Pressure Switch
B2050, B2350, B2650, B3150, WSM CABIN (8) Pressure Switch Pressure Switch 1) HI Pressure Side 1. Connect the manifold gauge (7) to compressor as following procedure. Close the HI and LO pressure valves (2), (3) of manifold gauge tightly, and connect the charging hoses (1), (4) (red and blue) to the respective compressor service valves.
Page 519: Wiper Switch
B2050, B2350, B2650, B3150, WSM CABIN (9) Wiper Switch Front and Rear Wiper (Option) Switch 1. Remove the panel under cover and meter panel. 2. Disconnect the front switch connector. 3. Perform the following checkings 1) and 2). (1) Front Wiper Switch (2) Rear Wiper Switch 9Y1210982CAS0049US0 1) Connector Voltage...
Page 520: Wiper Motor
B2050, B2350, B2650, B3150, WSM CABIN (10) Wiper Motor Front and Rear Wiper (Option) Motor 1. Raise up the wiper arm (2). 2. Turn the main switch to "ON" position. 3. Push the front wiper switch to "ON" position. 4. Count the number of wiper arm rocking per minutes. 5.
Page 521 B2050, B2350, B2650, B3150, WSM CABIN 2) Switch Continuity 1. Check the continuity across the terminals shown in the table below. 2. If the continuity specified below is not indicated, the switch is damaged. (1) Connector (Switch Side) 9Y1210982CAS0054US0 Other Relays 1.
Page 522: Disassembling And Assembling
B2050, B2350, B2650, B3150, WSM CABIN [2] DISASSEMBLING AND ASSEMBLING (1) Separating Cabin from Tractor Body NOTE • Without discharging the refrigerant from system. 9Y1210982CAS0056US0 Battery Cable 1. Open the bonnet and remove the side cover and bonnet. 2. Disconnect the battery negative cable (1). NOTE •...
Page 523 B2050, B2350, B2650, B3150, WSM CABIN Heater Hose 1. Disconnect the heater hoses (1), and then reconnect their hoses to make loop. NOTE • Put a mark to the each heater hoses before disconnecting. (1) Heater Hose 9Y1210982TRS0009US0 Accelerator Wire 1.
Page 524 B2050, B2350, B2650, B3150, WSM CABIN Lowering Speed Adjusting Shaft and Front Wheel Drive Lever Knob 1. Tap out the spring pin and remove the lowering speed adjusting shaft (1). 2. Remove the front wheel drive lever knob (2). (1) Lowering Speed Adjusting Shaft (2) Front Wheel Drive Lever Knob 9Y1210982TRS0014US0 Position Control Lever and Cruise Control Lever...
Page 525 B2050, B2350, B2650, B3150, WSM CABIN Electric Wiring 1. Disconnect the wiring connectors (1). (1) Wiring Connector 9Y1210982TRS0019US0 Brake Pedal Rods 1. Disconnect the both left and right sides brake pedal rods (1). (1) Brake Pedal Rod 9Y1210982TRS0020US0 Cabin Mounting Bolts 1.
Page 526: Removing Compressor Assembly
B2050, B2350, B2650, B3150, WSM CABIN (2) Removing Compressor Assembly Compressor Assembly 1. Discharge the refrigerant from the system. (See page 10-S17.) 2. Disconnect the low pressure pipe (suction) (4) and high pressure pipe (discharge) (1) from the compressor, then cap the open fitting immediately to keep moisture out of the system.
Page 527 B2050, B2350, B2650, B3150, WSM CABIN Hub Plate 1. Three stopper bolts (1) are set in stopper magnetic clutch (2) at the position corresponding to the shape of compressor. 2. The stopper magnetic clutch (2) is hung on hub plate (3) and it is fixed that the compressor rotates.
Page 528: Removing Receiver And Condenser
B2050, B2350, B2650, B3150, WSM CABIN (3) Removing Receiver and Condenser Discharging Refrigerant • See page 10-S17. 9Y1210982CAS0079US0 Removing Receiver and Condenser 1. Disconnect the pressure switch (6) and high pressure hose 1 (3) and high pressure hose 2 (7). 2.
Page 529 B2050, B2350, B2650, B3150, WSM CABIN Wiring Harness 1. Remove the inner roof. 2. Disconnect the temperature motor connector (3), and thermostat connectors (4). 3. Disconnect the mode motor connector (2) and blower resister (1) connector. (1) Blower Resister (3) Temperature Motor Connector (2) Mode Motor Connector (4) Thermostat Connector 9Y1210982CAS0081US0...
Page 530: Removing Air Conditioner Pipes
B2050, B2350, B2650, B3150, WSM CABIN Air Conditioning Unit 1. Remove the unit cover. 2. Disconnect the heater hoses (4). 3. Disconnect the air conditioner pipes (2). 4. Remove the screws and the unit. 5. Remove the duct hoses. (When reassembling) •...
Page 531 B2050, B2350, B2650, B3150, WSM CABIN High Pressure Hose 1, 2 and Low Pressure Hose 1. Disconnect the low pressure hose (3) and high pressure hose 1 (1) from the compressor (2), then cap the open fittings immediately to keep moisture out of the system. 2.
Page 532: Removing Heater Hoses
B2050, B2350, B2650, B3150, WSM CABIN High Pressure and Low Pressure Pipes 1. Remove the outer roof (1), inner roof (2) and inner cover (3). 2. Remove the lever grips and lever guide (4). 3. Remove the floor mat (5). 4.
Page 533: Cabin Windshields
• Sika product are made by Sika Corporation. • Shin Etsu silicon KE420 is made by Shin Etsu Polymer Corporation. • These materials can't be provided by Kubota Corporation. • Therefore, please find the local made equivalent materials in your country and use them when you need.
Page 534 B2050, B2350, B2650, B3150, WSM CABIN Before Replacing Windshields (1) [In case of using piano wire (When glass is clacked)] 1. Thread the piano wire from the inside of cabin. Tie its both ends to a wooden blocks or the like. (See the left figure.) 2.
Page 535 B2050, B2350, B2650, B3150, WSM CABIN Rear Windshield 1. Apply a Sika primer 260P-JM-1 on the cabin frame. 2. Apply a Sika Flex 250P-JM-1 (2) (or equivalent) on the rear windshield (1) as shown in figure. 3. Install the rear windshield (1) to the cabin and fix tit with a gummed tape.
Page 536 B2050, B2350, B2650, B3150, WSM CABIN Front Windshield NOTE • Apply the Sika Flex 250P-JM-1 (or equivalent) with the jig having the specified tip shape as shown in the figure left. • Apply it with a uniform speed to minimize unevenness. •...
Page 537: Wiper Motor
B2050, B2350, B2650, B3150, WSM CABIN (8) Wiper Motor Front Wiper Motor 1. Remove the panel lower cover. 2. Disconnect the front wiper motor 4P connector. 3. Remove the wiper arm mounting nut (4) and wiper arm (2). 4. Remove the wiper link cap (5). 5.
Page 538: Servicing
B2050, B2350, B2650, B3150, WSM CABIN [3] SERVICING Adjustment of Air Gap 1. Measure the air gap with a feeler gauge. 2. When the measurement value comes off from factory specification, adjustment shim (1) is added or deleted. 0.30 to 0.65 mm Air gap (L) Factory specification 0.012 to 0.025 in.
Page 539 EDITOR : KUBOTA FARM & INDUSTRIAL MACHINERY SERVICE, LTD. 64, ISHIZU-KITAMACHI, SAKAI-KU, SAKAI-CITY, OSAKA, 590-0823, JAPAN PHONE : ( 81 ) 72-241-1129 : ( 81 ) 72-245-2484 E-mail : ks_g.ksos-pub@kubota.com Printed in Japan 2014. 03, S, EI, EI, engusa Code No.9Y111-09820...

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Wsm b2350 Wsm b2650 Wsm b3150

Kubota WSM B2050 Workshop Manual

Information

General

1 Tractor Identification

2 General Precautions

3 Handling Precautions for Electrical Parts and Wiring

4 Lubricants, Fuel and Coolant

5 Tightening Torques

6 Maintenance Check List

7 Check and Maintenance

8 Special Tools

9 Tires

10 Implement Limitations

Servicing

1 Troubleshooting

2 Servicing Specifications

3 Tightening Torques

4 Checking, Disassembling and Servicing

Servicing

Mechanism

1 Structure

2 Front Case

3 Manual Transmission

4 Hydrostatic Transmission

5 Cruise Control

6 Range Gear Shift Section

7 Front Wheel Drive Section

8 Pto System (Hydraulic Pto Clutch Model)

9 Pto System (Mechanical Pto Clutch Model)

10 Differential Gear System

Servicing

Servicing

Servicing

1 Troubleshooting

2 Servicing Specifications

4 Checking, Disassembling and Servicing

Mechanism

Servicing

1 Troubleshooting

2 Servicing Specifications

4 Checking, Disassembling and Servicing

Mechanism

1 Hydraulic Circuit

2 Hydraulic Pump

3 Three Points Hydraulic System

4 Front Loader Control Valve (if Equipped)

5 Remote Control Valve (if Equipped)

6 Hydraulic Outlet

Servicing

2 Servicing Specifications

4 Checking, Disassembling and Servicing

Mechanism

1 Wiring Diagram

2 Engine Starting System and Stopping System

3 Charging System

4 Lighting System

5 Instrument Panel

Quick Links

Chapters

Troubleshooting

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Summary of Contents for Kubota WSM B2050