Kubota B1220 Workshop Manual
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Kubota B1220 Workshop Manual

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WORKSHOP MANUAL
TRACTOR
B1220,B1620,B1820
KiSC issued 07, 2011 A

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Summary of Contents for Kubota B1220

  • Page 1 WORKSHOP MANUAL TRACTOR B1220,B1620,B1820 KiSC issued 07, 2011 A...
  • Page 2 TO THE READER This Workshop Manual tells the servicing personnel about the mechanism, servicing and maintenance of the B1220, B1620 and B1820. It contains 4 parts: "Information", "General", "Mechanism" and "Servicing". Information This section contains information below. • Safety First •...
  • Page 3 INFORMATION KiSC issued 07, 2011 A...

  • Page 4: Table Of Contents

    INFORMATION CONTENTS 1. SAFETY FIRST ..........................I-1 2. SAFETY DECALS .......................... I-4 3. SPECIFICATIONS.......................... I-6 4. TRAVELING SPEEDS........................I-7 5. DIMENSIONS ..........................I-8 KiSC issued 07, 2011 A...

  • Page 5: Safety First

    INFORMATION B1220, B1620, B1820, WSM 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 INFORMATION B1220, B1620, B1820, WSM 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 INFORMATION B1220, B1620, B1820, WSM 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

    INFORMATION B1220, B1620, B1820, WSM 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.
  • Page 9 INFORMATION B1220, B1620, B1820, WSM 9Y1210272INI0002US0 (EU) KiSC issued 07, 2011 A...

  • Page 10: Specifications

    1000 min (rpm) / 1000 min (rpm) / 2722 min (rpm) PTO system 3150 min (rpm) Shaft USA No. 5 (KUBOTA 10-tooth) involute spline Mid PTO PTO / Engine (If equipped) – 2500 min (rpm) / 2750 min (rpm) speed rpm NOTE •...

  • Page 11: Traveling Speeds

    INFORMATION B1220, B1620, B1820, WSM 4. TRAVELING SPEEDS B1220 Model B1220 Tire size (Rear) 7 - 16 Farm Range gear Main gear km/h shift lever shift lever 0.79 0.49 1.43 0.889 2.59 1.61 4.41 2.74 Forward High 7.79 4.84 14.44 8.973...

  • Page 12: Dimensions

    INFORMATION B1220, B1620, B1820, WSM 5. DIMENSIONS 9Y1210272INI0005US0 (EU) KiSC issued 07, 2011 A...
  • Page 13 GENERAL KiSC issued 07, 2011 A...
  • Page 14 GENERAL CONTENTS 1. TRACTOR IDENTIFICATION....................... G-1 [1] MODEL NAME AND SERIAL NUMBER ................G-1 [2] CYLINDER NUMBER ......................G-2 2. GENERAL PRECAUTIONS......................G-3 3. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING ........G-4 [1] WIRING ..........................G-4 [2] BATTERY ..........................G-6 [3] FUSE ............................

  • Page 15: Tractor Identification

    GENERAL B1220, B1620, B1820, WSM 1. TRACTOR IDENTIFICATION [1] MODEL NAME AND SERIAL NUMBER When contacting your local KUBOTA distributor, always specify engine serial number, tractor serial number, ROPS serial number and hour meter reading. (1) Tractor Identification Plate [A] B1220...

  • Page 16: Cylinder Number

    B1220, B1620, B1820, WSM [2] CYLINDER NUMBER You can see the cylinder numbers of KUBOTA diesel engine in the figure. The sequence of cylinder numbers is No. 1, No. 2 and No. 3 and it starts from the gear case side.

  • Page 17: 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 18: Handling Precautions For Electrical Parts And Wiring

    GENERAL B1220, B1620, B1820, WSM 3. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING To ensure safety and prevent damage to the machine and surrounding equipment, heed the following precautions in handling electrical parts and wiring. IMPORTANT • Check electrical wiring for damage and loosened connection every year.
  • Page 19 GENERAL B1220, B1620, B1820, WSM • Securely insert grommet. (1) Grommet (A) Correct (B) Incorrect WSM000001GEG0066US1 • Securely clamp, being careful not to damage wiring. (1) Clamp (3) Clamp (Wind Clamp Spirally) (4) Welding Dent (2) Wire Harness WSM000001GEG0067US1 • Clamp wiring so that there is no twist, unnecessary sag, or excessive tension, except for movable part, where sag be required.

  • Page 20: Battery

    GENERAL B1220, B1620, B1820, WSM [2] BATTERY • Take care not to confuse positive and negative terminal posts. • When removing battery cables, disconnect negative cable first. When installing battery cables, check for polarity and connect positive cable first. • Do not install any battery with capacity other than is specified (Ah).

  • Page 21: Handling Of Circuit Tester

    GENERAL B1220, B1620, B1820, WSM • Use sandpaper to remove rust from terminals. • Repair deformed terminal. Make certain there is no terminal being exposed or displaced. (1) Exposed Terminal (3) Sandpaper (2) Deformed Terminal (4) Rust WSM000001GEG0075US1 • Make certain that there is no female connector being too open.

  • Page 22: Color Of Wiring

    GENERAL B1220, B1620, B1820, WSM [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...

  • Page 23: Lubricants, Fuel And Coolant

    SAE20, 10W-30 or 15W-40 • Below 0 °C (32 °F) SAE10W, 10W-30 or 15W-40 10.5 L Transmission case 2.77 U.S.gals KUBOTA UDT or SUPER UDT fluid* 2.31 Imp.gals 3.4 L KUBOTA UDT or SUPER UDT fluid, Front axle case 3.6 U.S.qts SAE80 or SAE90 gear oil 3.0 Imp.qts...
  • Page 24 • 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 25: Tightening Torques

    GENERAL B1220, B1620, B1820, WSM 5. TIGHTENING TORQUES [1] GENERAL USE SCREWS, BOLTS AND NUTS Screws, bolts and nuts whose tightening torques are not specified in this Workshop Manual should be tightened according to the table below. Indication on top of bolt...

  • Page 26: Metric Screws, Bolts And Nuts

    GENERAL B1220, B1620, B1820, WSM [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...

  • Page 27: Maintenance Check List

    100 Hr every 14 Clutch Adjust G-19 100 Hr every 15 Brake Adjust G-27 100 Hr every 16 Parking brake [except B1220] Adjust G-28 100 Hr every Check G-29 200 Hr 17 Radiator hose and clamp every Replace G-29 2 years...
  • Page 28 GENERAL B1220, B1620, B1820, WSM Indication on hour meter Refer- Impor- Item Interval ence tant 100 150 200 250 300 350 400 450 500 page every 24 Coolant Change G-33 2 years 25 Fuel system Bleed G-36 26 Clutch housing...
  • Page 29 100 Hr every 14 Clutch Adjust G-19 100 Hr every 15 Brake Adjust G-27 100 Hr every 16 Parking brake [except B1220] Adjust G-28 100 Hr every Check G-29 200 Hr 17 Radiator hose and clamp every Replace G-29 2 years...
  • Page 30 GENERAL B1220, B1620, B1820, WSM After Indication on hour meter Refer- purchase Impor- Item Interval ence tant page 550 600 650 700 750 800 1500 3000 1 year years every 24 Coolant Change G-33 2 years 25 Fuel system Bleed...

  • Page 31: Check And Maintenance

    GENERAL B1220, B1620, B1820, WSM 7. CHECK AND MAINTENANCE CAUTION • Be sure to check and service the tractor on a flat place with engine shut off, the parking brake on and chock the wheels. 9Y1210272GEG0063US0 [1] DAILY CHECK To prevent trouble from occurring, it is important to know the condition of the tractor. Check the following items before starting.

  • Page 32: Check Points Of Initial 50 Hours

    Then, replenish the engine oil up to the specified level. IMPORTANT • To prevent serious damage to the engine, replacement element must be highly efficient. Use only a KUBOTA genuine filter or its equivalent. (1) Engine Oil Filter Cartridge...
  • Page 33 Check the fluid level. IMPORTANT • To prevent serious damage to the hydraulic system. Use only a KUBOTA genuine filter or its equivalents. (1) Hydraulic Oil Filter 9Y1210272GEG0008US0 Checking Clutch Pedal Free Travel 1.

  • Page 34: Check Points Of Every 50 Hours

    GENERAL B1220, B1620, B1820, WSM [3] CHECK POINTS OF EVERY 50 HOURS Checking Engine Start System CAUTION • Do not allow anyone near the tractor while testing. • If the tractor does not pass the test do not operate the tractor.
  • Page 35 GENERAL B1220, B1620, B1820, WSM Greasing • Apply a grease to the following position as figures. (1) Battery Terminals (4) Grease Fitting (Clutch Pedal) (2) Grease Fitting (Brake Pedal) (5) Grease Fitting (Lift Rod, R.H.) (3) Grease Fitting (Pedal Shaft)
  • Page 36 GENERAL B1220, B1620, B1820, WSM (Continued) (7) Parking Brake Lever [Except B1220] 9Y1210272GEG0012US0 G-22 (EU) KiSC issued 07, 2011 A...

  • Page 37: Check Points Of Every 100 Hours

    GENERAL B1220, B1620, B1820, WSM [4] CHECK POINTS OF EVERY 100 HOURS Adjusting Clutch Pedal Free Travel • See page G-19. 9Y1210272GEG0013US0 Checking Battery Condition DANGER • Do not use or charge the refillable type battery if the fluid level is below the LOWER (lower limit level) mark.
  • Page 38 GENERAL B1220, B1620, B1820, WSM (Continued) 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 39 GENERAL B1220, B1620, B1820, WSM Cleaning Air Cleaner Element [Single Type Element] 1. Remove the cover (3) and then remove the element (1). 2. Clean element : – 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...
  • Page 40 GENERAL B1220, B1620, B1820, WSM Cleaning Air Cleaner Element [Double Type Element] (If Equipped) 1. Remove the air cleaner cover (2) and primary element (4). 2. Clean the primary element if : – When dry dust adheres to the element, blow compressed air from the inside turning the element.
  • Page 41 GENERAL B1220, B1620, B1820, WSM Checking Fan Belt Tension CAUTION • Be sure to stop engine before checking belt tension. 1. Stop the engine and remove the key. 2. Apply moderate thumb pressure to belt between pulleys. 3. If tension in incorrect, loosen the alternator mounting bolts and,...
  • Page 42 GENERAL B1220, B1620, B1820, WSM Adjusting Parking Brake [Except B1220] CAUTION • Stop the engine and chock the wheels before checking parking brake pedal. 1. Check free travel of the parking brake pedal. 2. If adjustment is needed, pull the parking release lever to release the parking brake, and then loosen the lock nut and the adjust nut.

  • Page 43: Check Points Of Every 200 Hours

    GENERAL B1220, B1620, B1820, WSM [5] CHECK POINTS OF EVERY 200 HOURS Changing Engine Oil • See page G-18. 9Y1210272GEG0023US0 Replacing Engine Oil Filter • See page G-18. 9Y1210272GEG0024US0 Checking Intake Air Line 1. Check to see that hoses and hose clamps are tight and not damaged.

  • Page 44: Check Points Of Every 400 Hours

    GENERAL B1220, B1620, B1820, WSM [6] CHECK POINTS OF EVERY 400 HOURS Replacing Hydraulic Oil Filter • See page G-19. 9Y1210272GEG0026US0 Changing Transmission Fluid CAUTION • Be sure to stop the engine before changing the oil filter cartridge. • Allow engine to cool down sufficiently, oil can be hot and can barn.
  • Page 45 3. After draining, reinstall the drain plugs. 4. Fill with new oil up to the upper notch on the dipstick. IMPORTANT • Use KUBOTA UDT, SUPER UDT fluid, SAE 80 or SAE 90 gear oil. Refer to "LUBRICANTS, FUEL AND COOLANT" (See page G-9).

  • Page 46: Check Point Of Every 800 Hours

    GENERAL B1220, B1620, B1820, WSM [7] CHECK POINT OF EVERY 800 HOURS Adjusting Engine valve Clearance • See page 1-S11. 9Y1210272GEG0030US0 [8] CHECK POINT OF EVERY 1500 HOURS Checking Fuel Injection Nozzle Injection Pressure • See page 1-S17. 9Y1210272GEG0031US0 [9] CHECK POINT OF EVERY 3000 HOURS Checking Injection Pump •...

  • Page 47: Check Points Of 2 Years

    GENERAL B1220, B1620, B1820, WSM [11] CHECK POINTS OF 2 YEARS Replacing Radiator Hose (Water Pipes) • See page G-29. 9Y1210272GEG0034US0 Replacing Fuel Line • See page G-28. 9Y1210272GEG0035US0 Replacing Intake Air Line • See page G-29. 9Y1210272GEG0036US0 Flushing Cooling System and Changing Coolant NOTE •...
  • Page 48 GENERAL B1220, B1620, B1820, WSM (Continued) Anti-Freeze CAUTION • When using antifreeze, put on some protection such as rubber gloves (Antifreeze contains position). • If should drink antifreeze, throw up at once and take medical attention. • When antifreeze comes in contact with the skin or clothing, wash it off immediately.
  • Page 49 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 50: Others

    GENERAL B1220, B1620, B1820, WSM [12] OTHERS Bleeding Fuel System Air must be removed: 1. When the fuel filter or lines are removed. 2. When the tank is completely empty. 3. After the tractor has not been used for a long period of time.
  • Page 51 GENERAL B1220, B1620, B1820, WSM Replacing Fuse [B1620 and B1820] 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 52 GENERAL B1220, B1620, B1820, WSM Replacing Light Bulb [B1620 and B1820] 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. Light...

  • Page 53: Special Tools

    GENERAL B1220, B1620, B1820, WSM 8. SPECIAL TOOLS [1] SPECIAL TOOLS FOR ENGINE Special Use Puller Set Code No. • 07916-09032 Application • Use exclusively for pulling out bearing, gears and other parts with ease. WSM000001GEG0011US0 Piston Ring Compressor Code No.
  • Page 54 GENERAL B1220, B1620, B1820, WSM Oil Pressure Tester Code No. • 07916-32032 Application • Use to measure lubricating oil pressure. (1) Gauge (5) Adaptor 2 (2) Cable (6) Adaptor 3 (3) Threaded Joint (7) Adaptor 4 (4) Adaptor 1 (8) Adaptor 5...
  • Page 55 GENERAL B1220, B1620, B1820, WSM Plastigauge Code No. • 07909-30241 Application • Use to check the oil clearance between crankshaft and bearing, etc.. Measuring range • Green: 0.03 to 0.07 mm (0.001 to 0.003 in.) • Red: 0.05 to 0.1 mm (0.002 to 0.006 in.) •...
  • Page 56 GENERAL B1220, B1620, B1820, WSM NOTE • The following special tools are not provided, so make them referring to the figure. WSM000001GEG0026US0 Injection Pump Pressure Tester Application • Use to check fuel tightness of injection pumps. Pressure gauge full scale : More than 29.4 MPa (300 kgf/cm...
  • Page 57 GENERAL B1220, B1620, B1820, WSM Valve Guide Replacing Tool Application • Use to press out and press in the valve guide. 225 mm (8.86 in.) 70 mm (2.8 in.) 45 mm (1.8 in.) 20 mm dia. (0.79 in. dia.) 11.7 to 11.9 mm dia. (0.461 to 0.468 in. dia.) 6.50 to 6.60 mm dia.

  • Page 58: Special Tools For Tractor

    GENERAL B1220, B1620, B1820, WSM [2] SPECIAL TOOLS FOR TRACTOR Tie-rod End Lifter Code No. • 07909-39051 Application • Use for removing the tie-rod end with ease. WSM000001GEG0029US0 Steering Wheel Puller Code No. • 07916-51090 Application • Use for removing the steering wheel without damaging the steering shaft.
  • Page 59 GENERAL B1220, B1620, B1820, WSM Relief Valve Pressure Tester Code No. • 07916-50045 Application • This allows easy measurement of relief set pressure. (1) Gauge (07916-50322) (6) Adaptor C (PS3/8) (07916-50371) (2) Cable (07916-50331) (7) Adaptor D (PT1/8) (07916-50381) (3) Threaded Joint (07916-50401)
  • Page 60 GENERAL B1220, B1620, B1820, WSM Bushing Replacing Tool Application • Use to press out and press in the bushing. 1. For small end bushing 157 mm (6.18 in.) 24 mm (0.94 in.) 120 mm (4.72 in.) 21.8 to 21.9 mm dia. (0.859 to 0.862 in. dia.) 24.8 to 24.9 mm dia.
  • Page 61 GENERAL B1220, B1620, B1820, WSM Disassembling Stand Application • Use for supporting engine. NOTE • This special tool is not provided, so make it referring to figure. 75 mm (3.0 in.) 95 mm (3.7 in.) 9 mm (0.4 in.) 37.5 mm (1.48 in.) 208 mm (8.19 in.)
  • Page 62 GENERAL B1220, B1620, B1820, WSM PS Plug Wrench Application • Use for tightening the plug for ball nut assembling. 64 mm (2.51 in.) 22.0 mm dia. (0.87 in. dia.) 48 mm (1.89 in.) 3.2 mm dia. (0.13 in. dia.) 36.2 to 36.3 mm (1.425 to 1.429 in.) 3 mm dia.

  • Page 63: Tires

    GENERAL B1220, B1620, B1820, WSM 9. TIRES [1] TIRE PRESSURE CAUTION • Do not attempt mount a tire. This should be done by a qualified person with the proper equipment. IMPORTANT • Do not use tires larger than specified. • When you intend to mount different size of tires from equipped ones, consult your distributor about front drive gear ratio for detail.

  • Page 64: Tread Adjustment

    GENERAL B1220, B1620, B1820, WSM [2] TREAD ADJUSTMENT CAUTION • Support tractor securely on stands before removing a wheel. • Never operate tractor with a loose rim, wheel or axle. IMPORTANT • Always attach tires as shown in the figure.

  • Page 65: Rear Wheels

    GENERAL B1220, B1620, B1820, WSM (2) Rear Wheels Rear tread can be adjusted in 2 or 3 steps depending on the model. 1. Loosen the nut (1) of cotter pin bolt. 2. Remove the snap pin (5) and wheel hub pin (4).

  • Page 66: Tire Liquid Injection

    GENERAL B1220, B1620, B1820, WSM [3] TIRE LIQUID INJECTION Auxiliary weights can be used to increase traction force for plowing in fields or clayey ground. Another way is to inject water or another liquid, such as a calcium chloride solution in the tires. Water must not be used in winter since it freezes at 0 °C (32 °F).
  • Page 67 GENERAL B1220, B1620, B1820, WSM Injection CAUTION • When a calcium chloride solution is used, cool it before pouring it into the tire. • Do not fill tires with water or solution more than 75 % of full capacity (to the valve stem level).
  • Page 68 ENGINE KiSC issued 07, 2011 A...
  • Page 69 SERVICING CONTENTS 1. TROUBLESHOOTING.........................1-S1 2. SERVICING SPECIFICATIONS ....................1-S4 3. TIGHTENING TORQUES......................1-S9 4. CHECKING, DISASSEMBLING AND SERVICING ..............1-S10 [1] CHECKING AND ADJUSTING....................1-S10 (1) Engine Body ........................1-S10 (2) Lubricating System ......................1-S12 (3) Cooling System ......................1-S13 (4) Fuel System........................1-S15 [2] PREPARATION ........................1-S19 (1) Separating Engine from Tractor ..................1-S19 [3] DISASSEMBLING AND ASSEMBLING ................1-S26 (1) Cylinder Head, Valves and Oil Pan ................1-S26 (2) Gear Case and Timing Gears..................1-S31...

  • Page 70: Troubleshooting

    ENGINE B1220, B1620, B1820, WSM 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Engine Does Not No fuel Replenish fuel Start Air in the fuel system Bleed G-36 Water in the fuel system Change fuel and – repair or replace fuel...
  • Page 71 ENGINE B1220, B1620, B1820, WSM Reference Symptom Probable Cause Solution Page Either Black or Dark Overload Reduce the load – Gray Exhaust Gas Is Low grade fuel used Use specified fuel Observed Fuel filter clogged Clean or replace G-26, G-31...
  • Page 72 ENGINE B1220, B1620, B1820, WSM Reference Symptom Probable Cause Solution Page Engine Overheated Engine oil insufficient Replenish G-18 Fan belt broken or elongated Replace or adjust 1-S13 Coolant insufficient Replenish Radiator net and radiator fin clogged with dust Clean –...

  • Page 73: Servicing Specifications

    ENGINE B1220, B1620, B1820, WSM 2. SERVICING SPECIFICATIONS ENGINE BODY Item Factory Specification Allowable Limit Valve Clearance (Cold) 0.145 to 0.185 mm – 0.00571 to 0.00728 in. Compression Pressure 2.84 to 3.24 MPa 2.26 MPa 29.0 to 33.0 kgf/cm 23.0 kgf/cm...
  • Page 74 ENGINE B1220, B1620, B1820, WSM Item Factory Specification Allowable Limit Tappet to Tappet Guide Oil Clearance 0.016 to 0.052 mm 0.10 mm 0.00063 to 0.00205 in. 0.0039 in. • Tappet O.D. 17.966 to 17.984 mm – 0.70732 to 0.70803 in.
  • Page 75 ENGINE B1220, B1620, B1820, WSM Item Factory Specification Allowable Limit Piston Pin to Small End Bushing (Spare Oil Clearance 0.015 to 0.075 mm 0.15 mm Parts) 0.00059 to 0.00295 in. 0.0059 in. • Small End Bushing I.D. 20.026 to 20.077 mm –...
  • Page 76 ENGINE B1220, B1620, B1820, WSM Item Factory Specification Allowable Limit Crankshaft Journal to Crankshaft Bearing 3 Oil Clearance 0.028 to 0.059 mm 0.20 mm (Intermediate) 0.00110 to 0.00232 in. 0.0079 in. O.D. 39.934 to 39.950 mm – • Crankshaft Journal 1.57221 to 1.57284 in.
  • Page 77 ENGINE B1220, B1620, B1820, WSM FUEL SYSTEM Item Factory Specification Allowable Limit Injection Pump [Z482/D722] Injection Timing 0.30 to 0.33 rad – 17 to 19 ° before T.D.C. Injection Pump [D782] Injection Timing 0.28 to 0.31 rad – 16 to 18 °...

  • Page 78: Tightening Torques

    ENGINE B1220, B1620, B1820, WSM 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-11.) [TRACTOR BODY] Item N·m kgf·m lbf·ft Steering wheel mounting nut 30 to 49 3.0 to 5.0...

  • Page 79: Checking, Disassembling And Servicing

    ENGINE B1220, B1620, B1820, WSM 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING (1) Engine Body Compression Pressure 1. Run the engine until it is warmed up. 2. Stop the engine. 3. Remove the air cleaner, the muffler and all injection nozzles.
  • Page 80 ENGINE B1220, B1620, B1820, WSM Valve Clearance IMPORTANT • Valve clearance must be checked and adjusted when engine is cold. 1. Remove the head cover, the glow plugs and the timing window (3) cover on the clutch housing. 2. Align the "1TC" marking line (4) on the flywheel and center of timing window so that the No.

  • Page 81: Lubricating System

    ENGINE B1220, B1620, B1820, WSM (2) Lubricating System Engine Oil Pressure 1. Remove the engine oil pressure switch, and set a oil pressure tester (Code No. 07916-32032). (Adapter screw size : PT 1/8) 2. Start the engine. After warming up, measure the oil pressure of both idling and rated speeds.

  • Page 82: Cooling System

    ENGINE B1220, B1620, B1820, WSM (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 83 ENGINE B1220, B1620, B1820, WSM Radiator Water Leakage CAUTION • When removing the radiator cap, wait at least ten minutes after the engine has stopped and cooled down. Otherwise, hot water way gush out, scalding nearby people. 1. Pour a specified amount of water into the radiator.

  • Page 84: Fuel System

    ENGINE B1220, B1620, B1820, WSM (4) Fuel System CAUTION • Check the injection pressure and condition after confirming that there is nobody standing in the direction the fume goes. If the fume from the nozzle directly contacts the human body, cells may be destroyed and blood poisoning may be caused.
  • Page 85 5. Set the speed control lever to the maximum speed position. 6. Run 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. 13.7 MPa...
  • Page 86 ENGINE B1220, B1620, B1820, WSM Nozzle Spraying Condition CAUTION • Check injection pressure condition after confirming 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 87 ENGINE B1220, B1620, B1820, WSM 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 88: Preparation

    ENGINE B1220, B1620, B1820, WSM [2] PREPARATION (1) Separating Engine from Tractor Bonnet, Front Grille, Side Cover and Battery Negative Cable 1. Open the bonnet (3) and remove the front grille (1). 2. Disconnect the negative cable (2). 3. Disconnect the head light connectors, horn connectors and remove the bonnet (3).
  • Page 89 ENGINE B1220, B1620, B1820, WSM Draining Engine Oil 1. Place an oil pan underneath the engine. 2. To drain the used oil, remove the drain plug (1) at the bottom of the engine and drain the oil completely. 3. Screw in the drain plug (1).
  • Page 90 ENGINE B1220, B1620, B1820, WSM Draining Transmission Fluid 1. Place an oil pan underneath the transmission case, and remove the drain plugs (1). 2. Drain the transmission fluid. 3. Reinstall the drain plug. (When refilling) • Fill new oil from filling port after removing the filling plug (2) up to the upper notch on the dipstick (3).
  • Page 91 2. Open the meter panel (3) and disconnect the hourmeter cable, meter panel connector (6), combination switch connector (4) and hazard switch connector (7) (Except B1220). Then remove the meter panel (3). 3. Disconnect the main switch connector (8) and remove the panel under cover (5).
  • Page 92 3. Disconnect the fuel hose (2) at the feed pump side. 4. Remove the fuel filter assembly. (3). 5. Disconnect the combination light lead wires (5). [Except B1220] 6. Disconnect the key stop timer connector (15), flusher unit connector (17), starter relay connector (11) and lead wires (16).
  • Page 93 5. Disconnect the glow plug lead wire, thermo sensor lead wire, oil pressure switch lead wire (6) and starter motor lead wire. 6. Disconnect the stop solenoid connector, alternator connector and lead wire. [Except B1220] 7. Disconnect the dynamo connector. [Only B1220]. (When reassembling) 35 to 45 N·m Power steering delivery Tightening torque 3.6 to 4.5 kgf·m...
  • Page 94 ENGINE B1220, B1620, B1820, WSM Separating the Engine from the Clutch Housing 1. Place the disassembling jack under the center frame. 2. Hoist the engine by the chain at the engine hook. 3. Remove the engine mounting screws, then separate the engine from the clutch housing with starter motor.

  • Page 95: Disassembling And Assembling

    ENGINE B1220, B1620, B1820, WSM [3] DISASSEMBLING AND ASSEMBLING (1) Cylinder Head, Valves and Oil Pan Cylinder Head Cover 1. Disconnect the breather hose (1). 2. Remove the cylinder head cover screws (2). 3. Remove the cylinder head cover (3).
  • Page 96 ENGINE B1220, B1620, B1820, WSM Nozzle Heat Seal Service Removal Procedure IMPORTANT • Use a plus (phillips head) screw driver (1) that has a diameter which is bigger than the heat seal hole (Approx. 6.0 mm (0.24 in.)). 1. Drive screw driver (1) lightly into the heat seal hole.
  • Page 97 ENGINE B1220, B1620, B1820, WSM Cylinder Head and Cylinder Head Gasket 1. Loosen the pipe clamps (1), and remove the water return pipe (2). 2. Remove the cylinder head screw in the order of (n or j) to (a). 3. Remove the cylinder head gasket.
  • Page 98 ENGINE B1220, B1620, B1820, WSM Valves 1. Remove the valve caps (4). 2. Remove the valve spring collet (3), pushing the valve spring retainer (2) by valve spring replacer (1). 3. Remove the valve spring retainer (2), valve spring (5) and valve stem seal (6).
  • Page 99 ENGINE B1220, B1620, B1820, WSM Oil Pan and Oil Strainer 1. Remove the oil pan mounting screws (2). 2. Remove the oil pan (1) by lightly tapping the rim of the pan with a wooden hammer. 3. Remove the oil strainer (3).

  • Page 100: Gear Case And Timing Gears

    ENGINE B1220, B1620, B1820, WSM (2) Gear Case and Timing Gears Injection Pump, Fuel Feed Pump and Speed Control Plate 1. Remove the socket head screws and nuts, and remove the injection pump (1). 2. Remove the screws and separate the speed control plate (2), taking care not to damage the governor spring (4).
  • Page 101 ENGINE B1220, B1620, B1820, WSM Gear Case 1. Disconnect the start spring (2) from the fork lever 1 (3). 2. Remove the screw (1) of inside the gear case and outside screws. 3. Remove the gear case (4). (When reassembling) •...
  • Page 102 ENGINE B1220, B1620, B1820, WSM Camshaft 1. Remove the camshaft mounting screws (1) and draw out the camshaft with gear (2) on it. (When reassembling) • When install the camshaft, apply engine oil to the camshaft journals. • Apply engine oil to the camshaft mounting screws. And tighten them.

  • Page 103: Piston And Connecting Rod

    ENGINE B1220, B1620, B1820, WSM (3) Piston and Connecting Rod Connecting Rod Cap 1. Remove the connecting rod caps (1) using a bihexagonal 8 mm socket. (When reassembling) • Align the marks (a) with each other. (Face the marks toward the injection pump.)
  • Page 104 ENGINE B1220, B1620, B1820, WSM 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) • When installing the ring, assemble the rings so that the manufacturer's mark (12) near the gap faces the top of the piston.

  • Page 105: Flywheel And Crankshaft

    ENGINE B1220, B1620, B1820, WSM (4) Flywheel and 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) • Set the No. 1 crankpin at the top dead center (T.D.C.).
  • Page 106 ENGINE B1220, B1620, B1820, WSM Crankshaft Assembly [For Z482 and D722] 1. Remove the main bearing case screw 2 (1). 2. Draw out all the crankshaft. [For D782] 1. Remove the main bearing case screw 2 (1). 2. Turn the crankshaft to set the crankpin of the third cylinder to the bottom dead center.
  • Page 107 ENGINE B1220, B1620, B1820, WSM Main Bearing Case Assembly (Z482, D722 and D782) 1. Remove the two main bearing case screws 1 (4), and remove the main bearing case assembly 1 (1), being careful with crankshaft bearing 3 (5). 2. Remove the main bearing case assembly 2 (2) and the main bearing case assembly (3) as above.

  • Page 108: Servicing

    ENGINE B1220, B1620, B1820, WSM [4] SERVICING (1) Cylinder Head and Valves Top Clearance 1. Remove the cylinder head. (Do not attempt to remove the cylinder head gasket.) 2. Move the piston up and stick a strip of fuse [1.5 mm dia. (0.059 in.
  • Page 109 ENGINE B1220, B1620, B1820, WSM Cylinder Head Flaw 1. Prepare an air spray red check. 2. Clean the surface of the cylinder head with detergent (2). 3. Spray the cylinder head surface with the red permeative liquid (1). Leave it five to ten minutes after spraying.
  • Page 110 ENGINE B1220, B1620, B1820, WSM Replacing Valve Guide (When removing) 1. Press out the used valve guide using a valve guide replacing tool. (Refer to "SPECIAL TOOLS".) (When installing) 1. Clean a new valve guide and valve guide bore, and apply engine oil to them.
  • Page 111 ENGINE B1220, B1620, B1820, WSM Correcting Valve and Valve Seat NOTE • Before correcting the valve and 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 112 ENGINE B1220, B1620, B1820, WSM 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 113 ENGINE B1220, B1620, B1820, WSM 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 114: Timing Gears

    ENGINE B1220, B1620, B1820, WSM (2) Timing Gears Timing Gear Backlash 1. Set a dial indicator (lever type) with its tip on the gear tooth. 2. Move the gear to measure the backlash, holding its mating gear. 3. If the backlash exceeds the allowable limit, check the oil clearance of the shaft and the gear.
  • Page 115 ENGINE B1220, B1620, B1820, WSM Camshaft Alignment 1. Support the camshaft with V blocks on the surface plate at both end journals. 2. Set a dial indicator with its tip on the intermediate journal. 3. Measure the camshaft alignment. 4. If the measurement exceeds the allowable limit, replace the camshaft.
  • Page 116 ENGINE B1220, B1620, B1820, WSM Oil Clearance between Idle Gear Shaft and Idle Gear Bushing 1. Measure the idle gear shaft O.D. with an outside micrometer. 2. Measure the idle gear bushing I.D. with an inside micrometer, and calculate the oil clearance.

  • Page 117: Piston And Connecting Rod

    ENGINE B1220, B1620, B1820, WSM (3) Piston and Connecting Rod Piston Pin Bore Internal Diameter 1. Measure the piston pin bore I.D. in both the horizontal and vertical directions with a cylinder gauge. 2. If the measurement exceeds the allowable limit, replace the piston.
  • Page 118 ENGINE B1220, B1620, B1820, WSM Connecting Rod Alignment NOTE • Since the I.D. of the connecting rod small end bushing is the basis of this check, check bushing for wear beforehand. 1. Install the piston pin into the connecting rod.

  • Page 119: Crankshaft

    ENGINE B1220, B1620, B1820, WSM 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.
  • Page 120 ENGINE B1220, B1620, B1820, WSM Crankshaft Alignment 1. Support the crankshaft with V blocks on the surface plate at both end journals. 2. Set a dial indicator with its tip on the intermediate journal. 3. Measure the crankshaft alignment. 4. If the measurement exceeds the allowable limit, replace the crankshaft.
  • Page 121 ENGINE B1220, B1620, B1820, WSM 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 122 ENGINE B1220, B1620, B1820, WSM Oil Clearance between Crankshaft Journal and Crankshaft Bearing 2 and Crankshaft Bearing 3 1. Put a strip of plastigage on the center of the journal. 2. Install the bearing case and tighten the bearing case screws 1 to the specified torque, and remove the bearing case again.
  • Page 123 ENGINE B1220, B1620, B1820, WSM Replacing Crankshaft Sleeve 1. Remove the used crankshaft sleeve (2). 2. Set the sleeve guide (3) to the crankshaft (1). 3. Heat a new sleeve to a temperature between 150 and 200 °C (302 and 392 °F), and fix the sleeve to the crankshaft as shown in figure.

  • Page 124: Cylinder

    ENGINE B1220, B1620, B1820, WSM (5) Cylinder Cylinder Wear 1. Measure the cylinder liner I.D. at the six positions (see figure) with a cylinder gauge to find the maximum and minimum I.D.'s. 2. Get the difference (Maximum wear) between the maximum and the minimum I.D.'s.

  • Page 125: Oil Pump

    ENGINE B1220, B1620, B1820, WSM (6) Oil Pump Rotor Lobe Clearance 1. Measure the clearance between lobes of the inner rotor and the outer rotor with a thickness gauge. 2. If the clearance exceeds the factory specifications, replace the oil pump rotor assembly.
  • Page 126 CLUTCH KiSC issued 07, 2011 A...
  • Page 127 MECHANISM CONTENTS 1. LINKAGE MECHANISM ......................2-M1 KiSC issued 07, 2011 A...
  • Page 128 CLUTCH B1220, B1620, B1820, WSM 1. LINKAGE MECHANISM (1) Engine Flywheel (4) Pressure Plate (7) Clutch Release Fork (10) Clutch Release Bearing (2) Clutch Disc (5) Diaphragm Spring (8) Clutch Pedal (11) Clutch Shaft (3) Clutch Cover (6) Clutch Rod...
  • Page 129 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] PREPARATION ........................2-S4 (1) Separating Engine from Clutch Housing .................2-S4 (2) Separating Clutch Assembly ..................2-S10 [3] SERVICING .........................2-S11 KiSC issued 07, 2011 A...

  • Page 130: Troubleshooting

    CLUTCH B1220, B1620, B1820, WSM 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Clutch Drags Clutch pedal free travel excessive Adjust 2-S4 Dust on clutch disc generated from clutch disc Remove rust 2-S10 facing Release fork broken Replace 2-S10 Clutch disc or pressure plate warped...

  • Page 131: Servicing Specifications

    CLUTCH B1220, B1620, B1820, WSM 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Hydraulic Pump Free Travel on 15 to 25 mm – Clutch Pedal 0.59 to 0.98 in. Distance "A" 10 to 15 mm – 0.40 to 0.59 in.

  • Page 132: Tightening Torques

    CLUTCH B1220, B1620, B1820, WSM 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-11.) Item N·m kgf·m lbf·ft Steering wheel mounting nut 30 to 49 3.0 to 5.0...

  • Page 133: Checking, Disassembling And Servicing

    CLUTCH B1220, B1620, B1820, WSM 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.
  • Page 134 CLUTCH B1220, B1620, B1820, WSM Draining Coolant CAUTION • Never open the radiator cap while operating or immediately after stopping. Otherwise, hot water will spout out from the radiator. Wait for more than ten minutes to cool the radiator, before opening the cap.
  • Page 135 CLUTCH B1220, B1620, B1820, WSM Draining Transmission Fluid 1. Place an oil pan underneath the transmission case, and remove the drain plugs (1). 2. Drain the transmission fluid. 3. Reinstall the drain plug. (When refilling) • Fill new oil from filling port after removing the filling plug (2) up to the upper notch on the dipstick (3).
  • Page 136 2. Open the meter panel (3) and disconnect the hourmeter cable, meter panel connector (6), combination switch connector (4) and hazard switch connector (7) (Except B1220). Then remove the meter panel (3). 3. Disconnect the main switch connector (8) and remove the panel under cover (5).
  • Page 137 3. Disconnect the fuel hose (2) at the feed pump side. 4. Remove the fuel filter assembly. (3). 5. Disconnect the combination light lead wires (5). [Except B1220] 6. Disconnect the key stop timer connector (15), flusher unit connector (17), starter relay connector (11) and lead wires (16).
  • Page 138 5. Disconnect the glow plug lead wire, thermo sensor lead wire, oil pressure switch lead wire (6) and starter motor lead wire. 6. Disconnect the stop solenoid connector, alternator connector and lead wire. [Except B1220] 7. Disconnect the dynamo connector. [Only B1220]. (When reassembling) 35 to 45 N·m Power steering delivery Tightening torque 3.6 to 4.5 kgf·m...

  • Page 139: Separating Clutch Assembly

    CLUTCH B1220, B1620, B1820, WSM Separating the Engine from the Clutch Housing 1. Place the disassembling jack under the center frame. 2. Hoist the engine by the chain at the engine hook. 3. Remove the engine mounting screws, then separate the engine from the clutch housing with starter motor.

  • Page 140: Servicing

    CLUTCH B1220, B1620, B1820, WSM [3] SERVICING Backlash between Clutch Disc and Clutch Shaft 1. Mount the clutch disc onto the clutch shaft. 2. Hold the clutch shaft so that it does not rotate. 3. Slightly move the disc and measure the displacement around disc edge.
  • Page 141 TRANSMISSION KiSC issued 07, 2011 A...
  • Page 142 MECHANISM CONTENTS 1. STRUCTURE..........................3-M1 [1] B1220 ........................... 3-M1 [2] B1620 AND B1820 ....................... 3-M2 2. POWER TRAIN FOR TRAVELLING SYSTEM................3-M3 [1] MAIN GEAR SHIFT SECTION ..................... 3-M3 [2] HI-LO GEAR SHIFT SECTION .................... 3-M4 [3] FRONT WHEEL DRIVE SHIFT SECTION ................3-M4 3.

  • Page 143: Structure

    TRANSMISSION B1220, B1620, B1820, WSM 1. STRUCTURE [1] B1220 (1) Front Wheel Drive Section (3) Lo-Hi Gear Shift Section (5) One-Way Clutch Section (Rear PTO) (2) Main Gear Shift Section (4) Differential Gear Section (6) PTO Gear Shift Section 3-M1...
  • Page 144 TRANSMISSION B1220, B1620, B1820, WSM [2] B1620 AND B1820 (1) Front Wheel Drive Section (3) Lo-Hi Gear Shift Section (5) One-Way Clutch Section (Rear PTO) (7) PTO Gear Shift Section (2) Main Gear Shift Section (4) Differential Gear Section (6) Mid PTO Shift Section (If Equipped)

  • Page 145: B1220

    TRANSMISSION B1220, B1620, B1820, WSM 2. POWER TRAIN FOR TRAVELLING SYSTEM [1] MAIN GEAR SHIFT SECTION Power Train [B1220] 1 : 1st Speed 1st gear shaft → 14T gear → Spline boss → 2nd gear shaft (2) → 28T gear → Spline boss → 2nd gear shaft →...

  • Page 146: Hi-Lo Gear Shift Section

    TRANSMISSION B1220, B1620, B1820, WSM [2] HI-LO GEAR SHIFT SECTION L : Low Range 4th gear shaft (1) → 11T gear → 32T gear → Spline boss → Spiral bevel pinion shaft (2) H : High Range 4th gear shaft (1) → 23T gear → Spline boss → 12T gear →...

  • Page 147: Power Train For Pto Gear

    TRANSMISSION B1220, B1620, B1820, WSM 3. POWER TRAIN FOR PTO GEAR [1] REAR PTO SHIFT SECTION (1) B1220 (1) 1st Gear Shaft with 14T Gear (3) 5th Gear Shaft with 11T Gear (4) PTO Shaft (5) 2nd Gear Shaft with...

  • Page 148: B1620 And B1820

    TRANSMISSION B1220, B1620, B1820, WSM (2) B1620 and B1820 (1) 1st Gear Shaft with 16T Gear (3) 5th Gear Shaft with 12T Gear (5) 2nd Gear Shaft with (A) Mid PTO Section (2) One-Way Clutch (4) PTO Gear Shaft with 30T...

  • Page 149: Mid Pto Shift Section [If Equipped]

    TRANSMISSION B1220, B1620, B1820, WSM [2] MID PTO SHIFT SECTION [IF EQUIPPED] (1) B1620 and B1820 (1) 1st Gear Shaft with 16T Gear (2) 2nd Gear Shaft with (3) Mid PTO Gear Shaft with 12T 11T-13T-18T Gear Gear Engage 1st gear shaft (1) → 16T gear → 26T gear → Spline boss → 2nd gear shaft (2) → 18T gear → 13T gear → 19T gear →...

  • Page 150: Shift Linkage

    TRANSMISSION B1220, B1620, B1820, WSM 4. SHIFT LINKAGE (1) Main Gear Shift Lever Shaft (3) Main Gear Shift Fork (5) PTO Gear Shift Lever (7) Hi-Lo Gear Shift Fork (9) Safety Switch for PTO Gear Shift (2) Safety Switch for Main Gear Shift...
  • Page 151 SERVICING CONTENTS 1. TROUBLESHOOTING.........................3-S1 2. SERVICING SPECIFICATIONS ....................3-S2 3. TIGHTENING TORQUES......................3-S3 4. DISASSEMBLING AND SERVICING ..................3-S4 [1] PREPARATION ........................3-S4 (1) Separating Engine from Clutch Housing .................3-S4 (2) Separating Center Frame and Transmission..............3-S11 [2] DISASSEMBLING AND ASSEMBLING ................3-S14 (1) Disassembling Clutch Housing..................3-S14 (2) Disassembling Transmission Case ................3-S15 (3) Disassembling Differential Gear Case................3-S20 [3] SERVICING .........................3-S21...

  • Page 152: Troubleshooting

    TRANSMISSION B1220, B1620, B1820, WSM 1. TROUBLESHOOTING CLUTCH HOUSING Reference Symptom Probable Cause Solution Page Noise from Clutch Bearing worn Replace 3-S21 Housing TRANSMISSION CASE SECTION Reference Symptom Probable Cause Solution Page Noise from Transmission oil insufficient Refill 3-S6 Transmission...

  • Page 153: Servicing Specifications

    TRANSMISSION B1220, B1620, B1820, WSM 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Shift Fork to Shift Gear Groove Clearance 0.10 to 0.35 mm 0.5 mm 0.0040 to 0.013 in. 0.02 in. 17T-15T Gear to Front Wheel Drive Shaft Clearance 0.027 to 0.067 mm...

  • Page 154: Tightening Torques

    TRANSMISSION B1220, B1620, B1820, WSM 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-11.) Item N·m kgf·m lbf·ft Steering wheel mounting nut 30 to 49 3.0 to 5.0...

  • Page 155: Disassembling And Servicing

    TRANSMISSION B1220, B1620, B1820, WSM 4. DISASSEMBLING AND SERVICING [1] PREPARATION (1) Separating Engine from Clutch Housing Bonnet, Front Grille, Side Cover and Battery Negative Cable 1. Open the bonnet (3) and remove the front grille (1). 2. Disconnect the negative cable (2).
  • Page 156 TRANSMISSION B1220, B1620, B1820, WSM Draining Engine Oil 1. Place an oil pan underneath the engine. 2. To drain the used oil, remove the drain plug (1) at the bottom of the engine and drain the oil completely. 3. Screw in the drain plug (1).
  • Page 157 TRANSMISSION B1220, B1620, B1820, WSM Draining Transmission Fluid 1. Place an oil pan underneath the transmission case, and remove the drain plugs (1). 2. Drain the transmission fluid. 3. Reinstall the drain plug. (When refilling) • Fill new oil from filling port after removing the filling plug (2) up to the upper notch on the dipstick (3).
  • Page 158 2. Open the meter panel (3) and disconnect the hourmeter cable, meter panel connector (6), combination switch connector (4) and hazard switch connector (7) (Except B1220). Then remove the meter panel (3). 3. Disconnect the main switch connector (8) and remove the panel under cover (5).
  • Page 159 3. Disconnect the fuel hose (2) at the feed pump side. 4. Remove the fuel filter assembly. (3). 5. Disconnect the combination light lead wires (5). [Except B1220] 6. Disconnect the key stop timer connector (15), flusher unit connector (17), starter relay connector (11) and lead wires (16).
  • Page 160 5. Disconnect the glow plug lead wire, thermo sensor lead wire, oil pressure switch lead wire (6) and starter motor lead wire. 6. Disconnect the stop solenoid connector, alternator connector and lead wire. [Except B1220] 7. Disconnect the dynamo connector. [Only B1220]. (When reassembling) 35 to 45 N·m Power steering delivery Tightening torque 3.6 to 4.5 kgf·m...
  • Page 161 TRANSMISSION B1220, B1620, B1820, WSM Separating the Engine from the Clutch Housing 1. Place the disassembling jack under the center frame. 2. Hoist the engine by the chain at the engine hook. 3. Remove the engine mounting screws, then separate the engine from the clutch housing with starter motor.

  • Page 162: Separating Center Frame And Transmission

    TRANSMISSION B1220, B1620, B1820, WSM (2) Separating Center Frame and Transmission Draining Transmission Fluid 1. Place an oil pan underneath the transmission case, and remove the drain plugs (1). 2. Drain the transmission fluid. 3. Reinstall the drain plug. (When refilling) •...
  • Page 163 TRANSMISSION B1220, B1620, B1820, WSM ROPS and Three Point Hitch 1. Remove the upper frame mounting bolts and nuts, then remove the upper frame (1). [If equipped] 2. Disconnect the wire harness and remove the tail lamps (4). [Except B1220] 3.
  • Page 164 Then remove the meter panel (3). [Except B1220] 6. Disconnect the meter panel connector and head light switch connector. Then remove the meter panel. [Only B1220] 7. Disconnect the main switch connector and remove the panel under cover (4).

  • Page 165: Disassembling And Assembling

    TRANSMISSION B1220, B1620, B1820, WSM Separating Transmission Assembly 1. Separate the transmission assembly from center frame. (When reassembling) 63 to 72 N·m Transmission case and Tightening torque 6.4 to 7.4 kgf·m center frame mounting bolt 47 to 53 lbf·ft 9Y1210272TRS0012US0...

  • Page 166: Disassembling Transmission Case

    8. Remove the pin (13), then remove the parking brake arm (12) and shaft (5). [Except B1220] 9. Remove the parking brake assembly (14). [Except B1220] 10. Remove the top link bracket, L.H. (10). 11. Remove the hydraulic cylinder assembly (1).
  • Page 167 TRANSMISSION B1220, B1620, B1820, WSM Front Cover and Mid-PTO Case 1. Remove the front cover mounting screw and remove the front cover (1). 2. Remove the mid-PTO case (2) from transmission case. [If equipped] (When reassembling) • Apply liquid gasket (Three Bond 1206D or equivalent) to joint face of the front cover and mid-PTO case to transmission case.
  • Page 168 TRANSMISSION B1220, B1620, B1820, WSM 3rd Shaft 1. Remove the middle shaft (6) and 19T gear (5). [If equipped] 2. Draw out the 3rd shaft (1) with 17T-13T gear (2) and shift fork (3) with shift rod (4). (When reassembling) •...
  • Page 169 TRANSMISSION B1220, B1620, B1820, WSM 4th Gear Shaft and Spiral Bevel Pinion Shaft 1. Draw out the spiral bevel pinion shaft (2) with 12T-32T shift gear (3), 13Tgear (6) and shift fork (5) with shift rod (4). 2. Draw out the 4th gear shaft (1) rearward.
  • Page 170 TRANSMISSION B1220, B1620, B1820, WSM Mid-PTO Shaft [If Equipped] 1. Remove the oil seal (1) and internal snap ring (3). 2. Remove the mid-PTO shaft (2) with bearings. (When reassembling) • Apply grease to lip and outer of oil seal.

  • Page 171: Disassembling Differential Gear Case

    TRANSMISSION B1220, B1620, B1820, WSM (3) Disassembling Differential Gear Case PTO Shaft 1. Remove the rear PTO cover mounting screws and remove the rear PTO cover assembly (1). (When reassembling) • Apply liquid gasket (Three Bond 1206D or equivalent) to joint face of differential gear case and PTO cover.

  • Page 172: Servicing

    TRANSMISSION B1220, B1620, B1820, WSM Spiral Bevel Gear 1. Remove the spiral bevel gear UBS screws (1). 2. Remove the spiral bevel gear (2) from differential case (3). (When reassembling) • Apply liquid lock (Loctite 262 or its equivalent) to the spiral bevel gear UBS screws.
  • Page 173 TRANSMISSION B1220, B1620, B1820, WSM Clearance between Shift Fork and Shift Gear Groove or Shifter 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.

  • Page 174: Differential Gear

    TRANSMISSION B1220, B1620, B1820, WSM (3) Differential Gear Clearance between Differential Case (Spiral Bevel Gear) and Differential Side Gear 1. Measure the differential side gear boss O.D. with an out side micrometer. 2. Measure the differential case I.D. and the spiral bevel gear I.D.
  • Page 175 TRANSMISSION B1220, B1620, B1820, WSM Backlash between Spiral Bevel Pinion and Spiral Bevel Gear 1. Set the dial indicator (lever type) with its finger on the end of spiral bevel pinion (4). 2. Move the spiral bevel pinion back and forth to each end and measure the side clearance.
  • Page 176 TRANSMISSION B1220, B1620, B1820, WSM (Continued) (1) Shim (2) Bevel Gear (3) Shim (4) Spiral Bevel Pinion (5) Shim (6) Bearing Holder 9Y1210272TRS0037US0 3-S25 (EU) KiSC issued 07, 2011 A...

  • Page 177: Rear Axle

    REAR AXLE KiSC issued 07, 2011 A...
  • Page 178 MECHANISM CONTENTS 1. STRUCTURE..........................4-M1 KiSC issued 07, 2011 A...
  • Page 179 REAR AXLE B1220, B1620, B1820, WSM 1. STRUCTURE (1) 9T Differential Gear Shaft (Brake Shaft) (2) 58T Spur Gear (3) Ball Bearing (4) Rear Axle Case (5) Rear Axle (6) Differential Gear (7) 37T Spiral Bevel Gear The rear axles are the semifloating type with ball bearings (3) between the rear axle (5) and the rear axle case (4), which supports the rear wheel load as well as transmitting power to the rear wheels.
  • Page 180 SERVICING CONTENTS 1. TROUBLESHOOTING.........................4-S1 2. TIGHTENING TORQUES......................4-S2 3. DISASSEMBLING AND SERVICING ..................4-S3 [1] DISASSEMBLING AND ASSEMBLING ................4-S3 [2] SERVICING ...........................4-S5 KiSC issued 07, 2011 A...

  • Page 181: Troubleshooting

    REAR AXLE B1220, B1620, B1820, WSM 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Excessive or Unusual Improper backlash between differential gear Replace – Noise at All Time shaft and final reduction gear Bearing worn Replace 4-S5 Insufficient or improper type of transmission fluid...

  • Page 182: Tightening Torques

    REAR AXLE B1220, B1620, B1820, WSM 2. 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-11.) Item N·m kgf·m lbf·ft Rear wheel cotter setting bolt and nut 123 to 147 12.6 to 15.0...

  • Page 183: Disassembling And Servicing

    REAR AXLE B1220, B1620, B1820, WSM 3. DISASSEMBLING AND SERVICING [1] DISASSEMBLING AND ASSEMBLING Draining Transmission Fluid 1. Place an oil pan underneath the transmission case, and remove the drain plugs (1). 2. Drain the transmission fluid. 3. Reinstall the drain plug.
  • Page 184 1. Remove the brake rod, L.H. (1) with spring (2). 2. Remove the parking brake rod, L.H. (3). [Except B1220] 3. Remove the pin (5) and parking brake arm (6). [Except B1220] 4. Remove the rear axle case, L.H. (4).

  • Page 185: Servicing

    Rear Axle Case (Right Hand Side) 1. Remove the brake rod, R.H. (2) with spring (3). 2. Remove the parking brake rod, R.H. (1). [Except B1220] 3. Remove the pin (6), then remove the parking brake shaft (4). [Except B1220] 4.
  • Page 186 BRAKES KiSC issued 07, 2011 A...
  • Page 187 MECHANISM CONTENTS 1. LINKAGE ............................ 5-M1 [1] B1220 ........................... 5-M1 [2] B1620 AND B1820 ....................... 5-M2 2. OPERATION..........................5-M3 KiSC issued 07, 2011 A...

  • Page 188: Linkage

    BRAKES B1220, B1620, B1820, WSM 1. LINKAGE [1] B1220 (1) Rear Axle Case (3) Adjusting Nut (5) Brake Rod (7) Parking Brake Lever (2) Lock Nut (4) Brake Cam Lever (6) Brake Pedal Independent mechanical wet disc brakes are used for the right and left traveling brakes. They are operated by the brake pedals through the mechanical linkages and provide stable braking and require little adjustment.

  • Page 189: B1620 And B1820

    BRAKES B1220, B1620, B1820, WSM [2] B1620 AND B1820 (1) Brake Pedal (3) Parking Brake Pedal (5) Parking Brake Lever Rod (7) Parking Brake Rod (2) Brake Rod (4) Parking Brake Release Lever (6) Parking Brake Arm (8) Brake Cam Lever Independent mechanical wet disc brakes are used for the right and left traveling brakes.

  • Page 190: Operation

    BRAKES B1220, B1620, B1820, WSM 2. OPERATION (1) Cam Plate (3) Brake Disc (5) Steel Ball (7) Brake Cam (2) Friction Plate (4) Rear Axle Case (6) Brake Shaft (8) Brake Cam Lever (Differential Gear Shaft) The brake body is incorporated in the rear axle case (4) filled with transmission oil and is designed to brake when the brake disc (3) splinted with the differential gear shaft (6) is pressed against the cam plate (1) by means of the cam mechanism incorporating steel balls (5).
  • Page 191 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 [B1220]......................5-S5 (2) Brake Pedal [B1620 and B1820] ..................5-S6 (3) Separating Rear Axle Case .....................5-S7 (4) Disassembling Rear Axle Case ..................5-S10 [3] SERVICING .........................5-S11...

  • Page 192: Troubleshooting

    BRAKES B1220, B1620, B1820, WSM 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Uneven Braking Brake pedal free travel unevenly adjusted Adjust 5-S4 Force Brake disc worn Replace 5-S11 Cam plate warped Replace 5-S11 Brake Drags Brake pedal free travel too small...

  • Page 193: Servicing Specifications

    BRAKES B1220, B1620, B1820, WSM 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Brake Pedal Free Travel 30 to 40 mm – 1.2 to 1.5 in. Cam Plate and Bearing Holder Flatness – – Cam Plate and Ball Height 22.89 to 22.99 mm 22.40 mm...

  • Page 194: Tightening Torques

    BRAKES B1220, B1620, B1820, WSM 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-11.) Item N·m kgf·m lbf·ft Rear wheel cotter setting bolt and nut 123 to 147 12.6 to 15.0...

  • Page 195: Checking, Disassembling And Servicing

    BRAKES B1220, B1620, B1820, WSM 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 the travel must be less than 5.0 mm (0.20 in.).

  • Page 196: Disassembling And Assembling

    BRAKES B1220, B1620, B1820, WSM [2] DISASSEMBLING AND ASSEMBLING (1) Brake Pedal [B1220] (1) External Snap Ring (4) Parking Brake Lever (7) Clutch Pedal (10) Pin (2) Return Spring (5) Return Spring (8) Pin (11) Brake Pedal, L.H. (3) Brake Rod...

  • Page 197: Brake Pedal [B1620 And B1820]

    BRAKES B1220, B1620, B1820, WSM (2) Brake Pedal [B1620 and B1820] (1) External Snap Ring (6) Parking Brake Rod, L.H. (11) Parking Release Lever (16) Clutch Pedal Rod (2) Return Spring (7) Parking Brake Lever, L.H. (12) Return Spring (17) Pin...

  • Page 198: Separating Rear Axle Case

    BRAKES B1220, B1620, B1820, WSM (3) Separating Rear Axle Case Draining Transmission Fluid 1. Place an oil pan underneath the transmission case, and remove the drain plugs (1). 2. Drain the transmission fluid. 3. Reinstall the drain plug. (When refilling) •...
  • Page 199 1. Remove the brake rod, L.H. (1) with spring (2). 2. Remove the parking brake rod, L.H. (3). [Except B1220] 3. Remove the pin (5) and parking brake arm (6). [Except B1220] 4. Remove the rear axle case, L.H. (4).
  • Page 200 Rear Axle Case (Right Hand Side) 1. Remove the brake rod, R.H. (2) with spring (3). 2. Remove the parking brake rod, R.H. (1). [Except B1220] 3. Remove the pin (6), then remove the parking brake shaft (4). [Except B1220] 4.

  • Page 201: Disassembling Rear Axle Case

    BRAKES B1220, B1620, B1820, WSM (4) Disassembling Rear Axle Case Differential Lock Shift Fork, Differential Lock Clutch (Right Side Only), 58T Gear and Rear Axle 1. Remove the spring (1). 2. Draw out the differential lock shift fork (2) and differential lock clutch (3) 3.

  • Page 202: Servicing

    BRAKES B1220, B1620, B1820, WSM [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. 9Y1210272BRS0014US0 Cam Plate Flatness and Bearing Holder Wear 1.

  • Page 203: Front Axle

    FRONT AXLE KiSC issued 07, 2011 A...
  • Page 204 MECHANISM CONTENTS 1. STRUCTURE..........................6-M1 KiSC issued 07, 2011 A...
  • Page 205 FRONT AXLE B1220, B1620, B1820, WSM 1. STRUCTURE (1) Axle (6) Bevel Gear Case (11) Spiral Bevel Pinion (16) Differential Side Gear (2) Axle Flange (7) Differential Yoke Shaft, L.H. (12) Front Axle Bracket, Front (17) Bevel Gear Shaft (3) Bevel Gear (8) Front Axle Case (13) Differential Yoke Shaft, R.H.
  • Page 206 SERVICING CONTENTS 1. TROUBLESHOOTING.........................6-S1 2. SERVICING SPECIFICATION ....................6-S2 3. TIGHTENING TORQUES......................6-S3 4. CHECKING, DISASSEMBLING AND SERVICING ..............6-S4 [1] DISASSEMBLING AND ASSEMBLING ................6-S4 (1) Separating Front Axle......................6-S4 (2) Disassembling Front Axle....................6-S6 [2] SERVICING .........................6-S10 KiSC issued 07, 2011 A...

  • Page 207: Troubleshooting

    FRONT AXLE B1220, B1620, B1820, WSM 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Front Wheels Wander Tire pressure uneven Adjust G-49 to Right or Left Clearance between front axle case boss and Replace – front axle bracket bushing (front, rear) excessive...

  • Page 208: Servicing Specification

    FRONT AXLE B1220, B1620, B1820, WSM 2. SERVICING SPECIFICATION Item Factory Specification Allowable Limit Differential Case to Deferential Pinion Clearance 0.032 to 0.068 mm 0.2 mm 0.00126 to 0.00268 in. 0.0079 in. • Differential Pinion O.D. 15.000 to 15.018 mm –...

  • Page 209: Tightening Torques

    FRONT AXLE B1220, B1620, B1820, WSM 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-11.) Item N·m kgf·m lbf·ft Front wheel mounting nut 78 to 90 7.9 to 9.2...

  • Page 210: Checking, Disassembling And Servicing

    2. Remove the both right and left hand side drain plugs (2) and filling plug (1) to drain the oil. 3. After draining, reinstall the drain plugs (2). IMPORTANT • Use KUBOTA SUPPER UDT fluid or SAE 80, 90 gear oil. Refer to "LUBRICANTS, FUEL AND COOLANT". (See page G-9.) 3.4 L Capacity 3.6 U.S.qts...
  • Page 211 FRONT AXLE B1220, B1620, B1820, WSM Front Wheel and Drag Link 1. Place the disassembling stand under the front axle frame. 2. Remove the front wheels (2). 3. Remove the drag link (1) from the knuckle arm. (When reassembling) IMPORTANT •...

  • Page 212: Disassembling Front Axle

    FRONT AXLE B1220, B1620, B1820, WSM (2) Disassembling Front Axle Tie-rod and Axle Bracket 1. Remove the slotted nut and remove the tie-rod (3). 2. Remove the front axle brackets (1), (2). (When reassembling) • Apply grease to the O-ring (4), (5), (6).
  • Page 213 FRONT AXLE B1220, B1620, B1820, WSM Front Gear Case 1. Remove the knuckle arm (Left side only). 2. Remove the axle flange (2). 3. Remove the external snap ring (3). 4. Remove the bevel gear case (4) from front gear case (1).
  • Page 214 FRONT AXLE B1220, B1620, B1820, WSM Bevel Gear Case Gears 1. Remove the internal snap ring (1). 2. Take out the bevel gears (4), (5) with ball bearings (3), (6) and shims (2). (When reassembling) • Install the shims (2) to their original position.
  • Page 215 FRONT AXLE B1220, B1620, B1820, WSM Spiral Bevel Pinion Shaft and Differential Gear Assembly 1. Remove the internal snap ring (1). 2. Tap out the spiral bevel pinion shaft (2) by the brass rod and hammer. 3. Take out the differential gear assembly (3) with differential yoke shafts, from right side of front axle case (4).

  • Page 216: Servicing

    FRONT AXLE B1220, B1620, B1820, WSM [2] 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, calculate the clearance.
  • Page 217 FRONT AXLE B1220, B1620, B1820, WSM Backlash between Spiral Bevel Pinion Shaft and Spiral Bevel Gear 1. Set a dia gauge (lever type) with its finger on the spline of spiral bevel pinion shaft. 2. Measure the backlash be moving the spiral bevel pinion shaft by hand lightly.
  • Page 218 STEERING KiSC issued 07, 2011 A...
  • Page 219 MECHANISM CONTENTS 1. STRUCTURE..........................7-M1 [1] STEERING LINKAGE......................7-M1 [2] POWER STEERING......................7-M2 KiSC issued 07, 2011 A...
  • Page 220 STEERING B1220, B1620, B1820, WSM 1. STRUCTURE [1] STEERING LINKAGE (1) Tie-rod (4) Pitman Arm (2) Knuckle Arm (5) Steering Wheel (3) Steering Gear Box (6) Drag Link 9Y1210272STM0001US0 7-M1 (EU) KiSC issued 07, 2011 A...
  • Page 221 STEERING B1220, B1620, B1820, WSM [2] POWER STEERING B1820 is equipped with integral type power steering that consists of rotary type control valve with torsion bar. Hydraulic oil flow is shown as follows. (1) Valve Housing (2) Gear Case (3) Sector Gear Shaft...
  • Page 222 SERVICING CONTENTS 1. TROUBLESHOOTING.........................7-S1 2. SERVICING SPECIFICATIONS ....................7-S3 3. TIGHTENING TORQUES......................7-S5 4. CHECKING, DISASSEMBLING AND SERVICING ..............7-S6 [1] CHECKING AND ADJUSTING....................7-S6 (1) Manual Steering Model....................7-S6 (2) Power Steering Model .....................7-S7 (3) Hydraulic Pump for Power Steering ................7-S9 [2] PREPARATION ........................7-S10 (1) Hydraulic Pump for Power Steering [Only B1820]............7-S10 (2) Separating Manual Steering Controller Box Assembly..........7-S11 [3] DISASSEMBLING AND ASSEMBLING ................7-S14...

  • Page 223: Troubleshooting

    STEERING B1220, B1620, B1820, WSM 1. TROUBLESHOOTING MANUAL STEERING MODEL Reference Symptom Probable Cause Solution Page Excessive Steering Backlash between sector gear shaft and ball nut Adjust 7-S6 Wheel Play too large Steering linkage worn Replace – Sector gear shaft worn...
  • Page 224 STEERING B1220, B1620, B1820, WSM POWER STEERING MODEL Reference Symptom Probable Cause Solution Page Excessive Steering Backlash between sector gear shaft and rack Adjust 7-S7 Wheel Play (piston) too large Steering linkage worn Replace – Sector gear shaft worn Replace...

  • Page 225: Servicing Specifications

    STEERING B1220, B1620, B1820, WSM 2. SERVICING SPECIFICATIONS [MANUAL STEERING MODEL] Item Factory Specification Allowable Limit Steering Wheel Operation Torque Less than – 50 N·m 5.1 kgf·m 37 lbf·ft Play 5.0 to 30 mm – 0.20 to 1.1 in. [POWER STEERING MODEL]...
  • Page 226 STEERING B1220, B1620, B1820, WSM Item Factory Specification Allowable Limit Steering Wheel Less than – Operation Torque Condition 10 N·m • Engine Speed 7.0 kgf·m Maximum 7.4 lbf·ft • Oil Temperature 45 to 55 °C (113 to 131 °F) Play 5.0 to 30 mm...

  • Page 227: Tightening Torques

    STEERING B1220, B1620, B1820, WSM 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-11.) [MANUAL STEERING MODEL] Item N·m kgf·m lbf·ft...

  • Page 228: Checking, Disassembling And Servicing

    STEERING B1220, B1620, B1820, WSM 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING (1) Manual Steering Model Steering Wheel Play 1. Turn the front wheels straight ahead. 2. Move the steering wheel back and forth until slight movement of pitman arm is seen.

  • Page 229: Power Steering Model

    STEERING B1220, B1620, B1820, WSM (2) Power Steering Model Steering Wheel Play 1. Turn the front wheels straight ahead. 2. Move the steering wheel back and forth until slight movement of pitman arm is seen. Measure maximum play of steering wheel at outer rim.
  • Page 230 STEERING B1220, B1620, B1820, WSM Relief Valve Setting Pressure 1. Open the bonnet and remove the front grille. 2. Disconnect the battery negative cable. 3. Remove the steering wheel (1) and then remove the meter panel and panel under cover.

  • Page 231: Hydraulic Pump For Power Steering

    (3) Hydraulic Pump for Power Steering Flowmeter Connecting and Test Preparation 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 232: Preparation

    STEERING B1220, B1620, B1820, WSM [2] PREPARATION (1) Hydraulic Pump for Power Steering [Only B1820] IMPORTANT • The hydraulic pump is precision machined and assembled : If disassemble once, it may be unable to maintain its original performance. Therefore, when the hydraulic pump fails, replacement should be carried out with the hydraulic pump assembled except when emergency repair is unavoidable.

  • Page 233: Separating Manual Steering Controller Box Assembly

    2. Open the meter panel (3) and disconnect the hourmeter cable, meter panel connector (6), combination switch connector (4) and hazard switch connector (7) (Except B1220). Then remove the meter panel (3). 3. Disconnect the main switch connector (8) and remove the panel under cover (5).
  • Page 234 2. Disconnect the over flow hoses (3) and pull out the hour meter cable (5). 3. Disconnect the combination light lead wires (2). [Except B1220] 4. Disconnect the key stop timer connector (12), flusher unit connector (14), starter relay connector (8) and lead wires (13).
  • Page 235 Manual Steering Controller Box Assembly [If Equipped] 1. Remove the flusher unit (1) from the steering post. 2. Remove the parking brake lever rod. [Only B1220] 3. Disconnect the drag link (4) from the pitman arm (3). 4. Remove the manual steering controller box assembly (2).

  • Page 236: Disassembling And Assembling

    STEERING B1220, B1620, B1820, WSM [3] DISASSEMBLING AND ASSEMBLING (1) Hydraulic Pump for Power Steering [Only B1820] Hydraulic Pump Cover, Side Plate and Gear 1. Secure the hydraulic pump with a vise, and remove the hydraulic pump cover. 2. Remove the side plate (5).

  • Page 237: Manual Steering Controller Body [If Equipped]

    STEERING B1220, B1620, B1820, WSM (2) Manual Steering Controller Body [If Equipped] NOTE • Replace all the disassembled sealing parts (O-ring, U-seal, oil seal, slipper seal, etc.) with new ones. • Check all the cleaned-up part for scratches, excessive wear, cracks and other defects. Place them in order on a clean workbench.
  • Page 238 (When reassembling) • Apply liquid lock (Three Bond 1206D or equivalent) to joint face of side cover (2) and steering controller box (4). • Use KUBOTA SUPER UDT fluid. Refer to "LUBRICANTS, FUEL AND COOLANT" (See page G-9). 0.3 L...

  • Page 239: Power Steering Controller Body [Only B1820]

    STEERING B1220, B1620, B1820, WSM (3) Power Steering Controller Body [Only B1820] NOTE • Replace all the disassembled sealing parts (O-ring, U-seal, oil seal, slipper seal, etc.) with new ones. • Check all the cleaned-up part for scratches, excessive wear, cracks and other defects. Place them in order on a clean workbench.
  • Page 240 STEERING B1220, B1620, B1820, WSM Valve Assembly and Rack (Piston) 1. Remove the valve housing mounting hex. head screws. 2. Draw out the valve assembly and rack (piston) as a unit. (When reassembling) 40 to 49 N·m Valve housing mounting Tightening torque 4.0 to 5.0 kgf·m...

  • Page 241: Servicing

    STEERING B1220, B1620, B1820, WSM [4] SERVICING (1) Hydraulic Pump for Power Steering Clearance between Tip of Gear Tooth and Casing 1. Measure the clearance between gear and casing at several points with feeler gauge. 2. If the clearance exceeds the allowable limit, replace the hydraulic pump assembly.

  • Page 242: Manual Steering Controller Body [If Equipped]

    STEERING B1220, B1620, B1820, WSM (2) Manual Steering Controller Body [If Equipped] Bearing and Bearing to Worm Shaft Contact Area 1. Inspect the lower and upper ball bearing and race for roughness or pitting. If damaged, replace bearing and race.

  • Page 243: Power Steering Controller Body [Only B1820]

    STEERING B1220, B1620, B1820, WSM (3) Power Steering Controller Body [Only B1820] Clearance between Steering Gear Box and Rack (Piston) 1. Measure the steering gear box cylinder I.D. with a cylinder gauge. 2. Measure the rack (piston) O.D. with an outside micrometer, and calculate this clearance.

  • Page 244: Hydraulic System

    HYDRAULIC SYSTEM KiSC issued 07, 2011 A...
  • Page 245 MECHANISM CONTENTS 1. HYDRAULIC CIRCUIT ....................... 8-M1 [1] B1220 ........................... 8-M1 [2] B1620 AND B1820 (MANUAL STEERING MODEL)............8-M2 [3] B1820 (POWER STEERING MODEL) ................. 8-M3 2. OIL FLOW........................... 8-M4 [1] B1220 ........................... 8-M4 [2] B1620 AND B1820 (MANUAL STEERING MODEL)............8-M4 [3] B1820 (POWER STEERING MODEL) .................

  • Page 246: Hydraulic Circuit

    (5) Hydraulic Pump (7) Transmission Case Valve (4) Relief Valve (6) Oil Filter (8) Hydraulic Cylinder (2) Hydraulic Control Valve Hydraulic system of B1220 is composed of main components as shown in the figure. 9Y1210272HYM0001US0 8-M1 (EU) KiSC issued 07, 2011 A...

  • Page 247: B1620 And B1820 (Manual Steering Model)

    HYDRAULIC SYSTEM B1220, B1620, B1820, WSM [2] B1620 AND B1820 (MANUAL STEERING MODEL) (1) Lowering Speed Adjusting (4) Hydraulic Block (6) Oil Filter (8) Relief Valve Valve (5) Hydraulic Pump (7) Transmission Case (9) Hydraulic Cylinder (2) Hydraulic Control Valve...

  • Page 248: B1820 (Power Steering Model)

    HYDRAULIC SYSTEM B1220, B1620, B1820, WSM [3] B1820 (POWER STEERING MODEL) (1) Lowering Speed Adjusting (4) Power Steering Assembly (7) Transmission Case (10) Relief Valve Valve (5) Hydraulic Pump (8) Hydraulic Pump (11) Hydraulic Cylinder (2) Hydraulic Control Valve (for Power Steering)

  • Page 249: Oil Flow

    HYDRAULIC SYSTEM B1220, B1620, B1820, WSM 2. OIL FLOW [1] B1220 (1) Hydraulic Pump (2) Suction Pipe (3) Oil Filter (4) Delivery Pipe A : Suction Oil B : Low Pressure Oil 9Y1210272HYM0004US0 [2] B1620 AND B1820 (MANUAL STEERING MODEL)

  • Page 250: B1820 (Power Steering Model)

    HYDRAULIC SYSTEM B1220, B1620, B1820, WSM [3] B1820 (POWER STEERING MODEL) (1) Hydraulic Pump (for 3 Point Hitch) (2) Power Steering Delivery Pipe (3) Suction Pipe (4) Oil Filter (5) Hydraulic Block (6) 3 Point Hitch Delivery Pipe (7) Return Pipe...

  • Page 251: Hydraulic Pump

    HYDRAULIC SYSTEM B1220, B1620, B1820, WSM 3. HYDRAULIC PUMP [1] MANUAL STEERING MODEL The hydraulic pump is composed of the casing (1), cover (3), side plate (4), and two spur gears (drive gear (2) and driven gear (5)) that are in mesh.

  • Page 252: Hydraulic Control Valve

    HYDRAULIC SYSTEM B1220, B1620, B1820, WSM [3] HYDRAULIC CONTROL VALVE Neutral Oil forced into the control valve (1) through P port and returns to the transmission case through T1 port. Also, C port is closed by spool (2), oil in the hydraulic cylinder does not flow to the transmission case.

  • Page 253: Feedback Linkage For Position Control

    HYDRAULIC SYSTEM B1220, B1620, B1820, WSM [4] FEEDBACK LINKAGE FOR POSITION CONTROL (1) Lift Arm RH (3) Feedback Rod (5) Feedback Pin (7) Feedback Arm (2) Interlocker (4) Hydraulic Control Lever (6) Control Lever Shaft (8) Control Lever Arm When the hydraulic control lever (4) moved to rearward to lift the implement, the spool of the control valve is pulled out to form a raising circuit by the motions of feedback arm (7), control lever shaft (6) and control lever arm (8).

  • Page 254: Relief Valve

    HYDRAULIC SYSTEM B1220, B1620, B1820, WSM [5] RELIEF VALVE The three point hydraulic system circuit has a relief valve to restrict the maximum pressure in the circuit. The relief valve is located in control valve body. Among direct acting relief valves, this type is suited to higher pressure and has large capacity.

  • Page 255: Hydraulic Cylinder

    HYDRAULIC SYSTEM B1220, B1620, B1820, WSM [6] HYDRAULIC CYLINDER (1) Lowering Speed Adjusting (3) Hydraulic Cylinder (6) O-ring (9) Hydraulic Control Valve Shaft (4) Hydraulic Arm (7) Back-up Ring (10) Lift Arm (2) Ball (5) Piston (8) Hydraulic Rod The main components of the hydraulic cylinder (3) are shown in the figure above. While the lift arm (10) is rising, oil from the hydraulic pump flows into the hydraulic cylinder (3) through the control valve (9).

  • Page 256: Hydraulic Block Type Outlet

    HYDRAULIC SYSTEM B1220, B1620, B1820, WSM [7] HYDRAULIC BLOCK TYPE OUTLET The hydraulic block type outlet is located at the delivery pipe. 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 257 SERVICING CONTENTS 1. TROUBLESHOOTING.........................8-S1 2. SERVICING SPECIFICATIONS ....................8-S2 3. TIGHTENING TORQUES......................8-S4 4. CHECKING, DISASSEMBLING AND SERVICING ..............8-S5 [1] CHECKING AND ADJUSTING....................8-S5 (1) Hydraulic Pump for 3 Point Hydraulic System..............8-S5 (2) Relief Valve ........................8-S7 (3) Lift Arm ..........................8-S8 [2] PREPARATION ........................8-S9 (1) Hydraulic Pump .......................8-S9 (2) Hydraulic Cylinder and Control Valve................8-S9 [3] DISASSEMBLING AND ASSEMBLING ................8-S11...
  • Page 258 HYDRAULIC SYSTEM B1220, B1620, B1820, WSM 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Implement Does Not Control valve broken Replace 8-S13 Rise (No Noise) Control valve improperly adjusted Adjust 8-S7 Control valve improperly assembled Repair 8-S13 Relief valve improperly assembled...

  • Page 259: Servicing Specifications

    HYDRAULIC SYSTEM B1220, B1620, B1820, WSM 2. SERVICING SPECIFICATIONS HYDRAULIC PUMP FOR THREE POINT HYDRAULIC SYSTEM Item Factory Specification Allowable Limit Pump Delivery At no pressure 8.4 L/min. – B1220 2.2 U.S.gals/min. 1.8 Imp.gals/min. B1620 and B1820 14.1 L/min. –...
  • Page 260 HYDRAULIC SYSTEM B1220, B1620, B1820, WSM THREE POINT HYDRAULIC SYSTE Item Factory Specification Allowable Limit Relief Valve [B1220] 9.40 to 10.2 MPa – Setting Pressure Condition 95.9 to 104 kgf/cm • Engine Speed 1370 to 1470 psi Approx. 3100 min (rpm) •...
  • Page 261 HYDRAULIC SYSTEM B1220, B1620, B1820, WSM 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-11.) Item N·m kgf·m lbf·ft Power Steering delivery pipe nut 35 to 45 3.6 to 4.5...

  • Page 262: Checking, Disassembling And Servicing

    (1) Hydraulic Pump for 3 Point Hydraulic System Flowmeter Connecting and Test Preparation 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 263 4. Read and note the pump delivery at no pressure. 5. Slowly close the loading valve to increase pressure approx. 9.4 MPa (96 kgf/cm , 1400 psi). [Only B1220] 6. Slowly close the loading valve to increase pressure approx. 11.5 MPa (117 kgf/cm , 1670 psi).

  • Page 264: Relief Valve

    HYDRAULIC SYSTEM B1220, B1620, B1820, WSM (2) Relief Valve Relief Valve Steering Pressure 1. Remove the seat under cover. 2. Remove the plug (R 1/16) (1) from the hydraulic cylinder case. 3. Install the adaptor (R 1/16). Then connect the cable and the pressure gauge to the adaptor (R 1/16.)

  • Page 265: Lift Arm

    HYDRAULIC SYSTEM B1220, B1620, B1820, WSM (3) Lift Arm Lift Arm Free Play 1. Set the 3-point hitch to the lowest position. 2. Start the engine, and set at the idling speed. 3. Move the hydraulic control lever to lift position until the lift arm moves to the uppermost position and relief valve opens.

  • Page 266: Preparation

    HYDRAULIC SYSTEM B1220, B1620, B1820, WSM [2] PREPARATION (1) Hydraulic Pump IMPORTANT • The hydraulic pump is precision machined and assembled : If disassemble once, it may be unable to maintain its original performance. Therefore, when the hydraulic pump fails, replacement should be carried out with the hydraulic pump assembled except when emergency repair is unavoidable.
  • Page 267 HYDRAULIC SYSTEM B1220, B1620, B1820, WSM Top Link Bracket L.H. and Lift Rod 1. Remove the top link and disconnect the lift rods (2). 2. Remove the top link bracket (1). (When reassembling) 78 to 90 N·m Top link bracket mounting Tightening torque 7.9 to 9.2 kgf·m...

  • Page 268: Disassembling And Assembling

    HYDRAULIC SYSTEM B1220, B1620, B1820, WSM [3] DISASSEMBLING AND ASSEMBLING (1) Hydraulic Pump [Manual Steering Model] Cover, Side Plate and Gear 1. Secure the hydraulic pump with a visa, and remove the cover. 2. Remove the side plate (3). 3. Remove the drive gear (2) and driven gear (4) from the casing (1).

  • Page 269: Hydraulic Pump [Power Steering Model]

    HYDRAULIC SYSTEM B1220, B1620, B1820, WSM (2) Hydraulic Pump [Power Steering Model] 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).

  • Page 270: Hydraulic Cylinder

    HYDRAULIC SYSTEM B1220, B1620, B1820, WSM (3) Hydraulic Cylinder Control Valve 1. Remove the control valve mounting screws, and remove the control valve (1). (When reassembling) • Take care not to damage the O-rings. 24 to 27 N·m Control valve mounting Tightening torque 2.4 to 2.8 kgf·m...

  • Page 271: Hydraulic Control Valve

    HYDRAULIC SYSTEM B1220, B1620, B1820, WSM Lowering Speed Adjusting Valve 1. Remove the lowering speed adjusting valve body (2) with the lowering speed adjusting shaft (1). 2. Draw out the poppet (3) and the spring (4). (When reassembling) • Take care not to damage the O-rings.

  • Page 272: Servicing

    HYDRAULIC SYSTEM B1220, B1620, B1820, WSM [4] SERVICING (1) Hydraulic Pump Clearance between Tip of Gear Tooth and Casing 1. Measure the clearance between gear and casing at several points with feeler gauge. 2. If the clearance exceeds the allowable limit, replace the assembly.

  • Page 273: Hydraulic Cylinder

    HYDRAULIC SYSTEM B1220, B1620, B1820, WSM (2) Hydraulic Cylinder Hydraulic Cylinder Bore 1. Check the cylinder internal surface for spring or damage. 2. Measure the cylinder I.D. with a cylinder gauge. 3. If the measurement exceeds the allowable limit, replace the hydraulic cylinder block.

  • Page 274: Electrical System

    ELECTRICAL SYSTEM KiSC issued 07, 2011 A...
  • Page 275 MECHANISM CONTENTS 1. WIRING DIAGRAM........................9-M1 [1] B1220 (WITHOUT OPC TYPE) .................... 9-M1 [2] B1220 (WITH OPC TYPE) ....................9-M2 [3] B1620 AND B1820 (WITHOUT OPC TYPE) ................ 9-M3 [4] B1620 AND B1820 (WITH OPC TYPE) ................9-M4 [5] B1620 AND B1820 (WITH OPC AND PTO GEAR SHIFT LEVER SWITCH TYPE) .... 9-M5 2.

  • Page 276: Wiring Diagram

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM 1. WIRING DIAGRAM [1] B1220 (WITHOUT OPC TYPE) 9-M1 (EU) KiSC issued 07, 2011 A...

  • Page 277: B1220 (With Opc Type)

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM [2] B1220 (WITH OPC TYPE) 9-M2 (EU) KiSC issued 07, 2011 A...

  • Page 278: B1620 And B1820 (Without Opc Type)

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM [3] B1620 AND B1820 (WITHOUT OPC TYPE) 9-M3 (EU) KiSC issued 07, 2011 A...

  • Page 279: B1620 And B1820 (With Opc Type)

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM [4] B1620 AND B1820 (WITH OPC TYPE) 9-M4 (EU) KiSC issued 07, 2011 A...

  • Page 280: B1620 And B1820 (With Opc And Pto Gear Shift Lever Switch Type)

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM [5] B1620 AND B1820 (WITH OPC AND PTO GEAR SHIFT LEVER SWITCH TYPE) 9-M5 (EU) KiSC issued 07, 2011 A...

  • Page 281: Starting System

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM 2. STARTING SYSTEM [1] B1220 (1) Without OPC Type (1) Joint Connector (4) Frame Earth (7) Battery (10) Safety Switch 2 (2) Glow Plug Indication (5) Glow Plug (8) Starter (11) Safety Switch 1...

  • Page 282: With Opc Type

    (2) With OPC Type B1220 tractor equipped Operator Presence Control (OPC) system. This system will automatically stop the engine when operator stands up from the seat while shifting the PTO gear shift lever, the main gear shift lever and the parking brake lever.

  • Page 283: B1620 And B1820

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM [2] B1620 AND B1820 (1) Without OPC Type (1) Joint Connector (5) Main Switch (8) Battery (11) Timer Relay (2) Glow Plug Indication (6) Frame Earth (9) Starter (12) Safety Relay (3) Safety Switch 1...

  • Page 284: With Opc Type

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM (2) With OPC Type B1620 and B1820 tractor equipped Operator Presence Control (OPC) system. This system will automatically stop the engine when operator stands up from the seat while shifting the PTO gear shift lever, the main gear shift lever and the parking brake lever.

  • Page 285: With Opc And Pto Gear Shift Lever Switch Type

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM (3) With OPC and PTO Gear Shift Lever Switch Type (1) Timer Relay 2 (7) PTO Gear Shift Lever Switch (11) Parking Brake Switch (16) Starter (2) Relay (Mid) (12) Frame Earth (17) Glow Plug...

  • Page 286: Safety Switch And Engine Condition

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM [3] SAFETY SWITCH AND ENGINE CONDITION (1) Related Switches [A] Without OPC Type Main Gear Shift Switch This switch is located on the main gear shift cover. When the main gear shift lever is not in neutral position, this switch is pushed in and electric circuit is opened.

  • Page 287: Related Switches

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM (3) Related Switches [A] B1220 (With OPC Type) Main Gear Shift Switch • See page 9-M11 9Y1210272ELM0027US0 Rear PTO Switch • See page 9-M11 9Y1210272ELM0028US0 Parking Brake Switch This switch is located near the axle case L.H. When...
  • Page 288 ELECTRICAL SYSTEM B1220, B1620, B1820, WSM [B] B1620 and B1820 (With OPC Type) Main Gear Shift Switch • See page 9-M11 9Y1210272ELM0031US0 Rear PTO Switch • See page 9-M11 9Y1210272ELM0032US0 Parking Brake Switch This switch is located on the axle case L.H. When...
  • Page 289 ELECTRICAL SYSTEM B1220, B1620, B1820, WSM [C] B1620 and B1820 (With OPC and Mid PTO Gear Shift Lever Switch Type) PTO Gear Shift Lever Switch (with Mid PTO) This switch is located under the left lever guide. When the PTO gear shift lever switch is not in neutral position, the PTO gear shift lever switch is turned on and electric circuit is opened.

  • Page 290: Engine Starting Conditions And Automatic Engine Stop

    (2M) from main switch 50 terminal, and the engine can be started. Engine can be shut off under following conditions since these conditions cause key stop relay to operate and it controls fuel cut solenoid. B1220, B1620, B1820 (Without Mid PTO) Main Shift Lever PTO Switch...

  • Page 291: Charging System

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM 3. CHARGING SYSTEM [1] B1220 (1) Fuse (4) Main Switch (7) Battery (9) AC Dynamo (2) Joint Connector (5) Frame Earth (8) Starter (10) IC Regulator (3) Charging Lamp (6) Slow Blow Fuse The charge system supplies electric power for various electrical devices and also charges the battery while the engine runs.

  • Page 292: B1620 And B1820

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM [2] B1620 AND B1820 (1) Charging Lamp (3) Fuse (5) Battery (7) Alternator (2) Main Switch (4) Slow Blow Fuse (6) Starter The charging system supplies electric power for various electrical devices and also charges the battery while the engine runs.

  • Page 293: Lighting System

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM 4. LIGHTING SYSTEM [1] B1220 The lighting system consists of light switch, head lights etc.. 9Y1210272ELM0010US0 (1) Head Light The light switch has two position OFF and ON. Current passes through the light circuit as shown in the figure above.

  • Page 294: B1620 And B1820

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM [2] B1620 AND B1820 The lighting system consists of combination switch (light switch and hazard switch), head lights, tail lights, hazard lights, etc.. 9Y1210272ELM0013US0 (1) Head Light The light switch, which forms a combination switch with the turn signal light switch, has two position OFF and ON.

  • Page 295: Hazard Lamp

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM Combination Switch Combination switch consist of head light switch, turn signal light switch and horn switch. (1) Head Light Switch (3) Turn Signal Light Switch (2) Horn Switch 9Y1210272ELM0016US0 [3] HAZARD LAMP Hazard switch has two positions; ON and OFF. Blinking the hazard lamp and indicator lamps as shown in the figure above.

  • Page 296: Easy Checker

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM 5. EASY CHECKER™ To check the conditions of tractor easily before and during operation, Easy Checker™ combination of lamps on the Easy Checker™ board is provided. 9Y1210272ELM0018US0 [1] INDICATION ITEMS (1) Oil Pressure Lamp When the engine oil pressure is low, this lamp illuminates.
  • Page 297 (8) Glow Plug ........................9-S16 (9) Safety Switches ......................9-S17 (10)Starter ...........................9-S26 (11)AC Dynamo [B1220] .....................9-S26 (12)Regulator [B1220] (Without OPC Type) ................9-S27 (13)Regulator [B1220] (With OPC Type) ................9-S28 (14)Alternator [B1620 and B1820] ..................9-S29 (15)Head Light Switch [B1220] ....................9-S30 (16)Combination Switch [B1620 and B1820]...............9-S31 (17)Hazard Switch [B1620 and B1820] ................9-S33...
  • Page 298 ELECTRICAL SYSTEM B1220, B1620, B1820, WSM 1. TROUBLESHOOTING [1] B1220 Reference Symptom Probable Cause Solution Page All Electrical Battery discharged or defective Recharge or Replace G-23, 9-S9 Equipments Do Not Battery positive cable disconnected or improperly Repair or Replace 9-S9...
  • Page 299 ELECTRICAL SYSTEM B1220, B1620, B1820, WSM CHARGING SYSTEM Reference Symptom Probable Cause Solution Page Charging Lamp Does Fuse blown (10A) Replace G-36 Not Light when Main Wiring harness disconnected or improperly Repair or Replace – Switch Is Turned ON connected (between main switch AC terminal...
  • Page 300 ELECTRICAL SYSTEM B1220, B1620, B1820, WSM GAUGES Reference Symptom Probable Cause Solution Page Fuel Gauge Does Not Fuel gauge defective Repair 9-S38 Function Fuel level sensor defective Replace 9-S38 Wiring harness disconnected or improperly Repair or Replace – connected (between panel board and fuel level...

  • Page 301: B1620 And B1820

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM [2] B1620 AND B1820 Reference Symptom Probable Cause Solution Page All Electrical Battery discharged or defective Recharge or Replace G-23, 9-S9 Equipments Do Not Battery positive cable disconnected or improperly Repair or Replace 9-S9...
  • Page 302 ELECTRICAL SYSTEM B1220, B1620, B1820, WSM AUTOMATIC ENGINE STOP Reference Symptom Probable Cause Solution Page Engine Does Not Solenoid fuse blown Replace G-37 Stop When Main Timer replay defective Replace 9-S13 Switch Is Turned OFF Key stop solenoid defective Replace...
  • Page 303 ELECTRICAL SYSTEM B1220, B1620, B1820, WSM LIGHTING SYSTEM Reference Symptom Probable Cause Solution Page Head light Does Not Fuse blown (10A) Replace G-37 Light Bulb blown Replace G-38 Wiring harness disconnected or improperly Repair or Replace – connected (between main switch AC terminal...
  • Page 304 ELECTRICAL SYSTEM B1220, B1620, B1820, WSM EASY CHECKER™ Reference Symptom Probable Cause Solution Page Oil Pressure Lamp Engine oil pressure too low Repair engine – Lights Up When Engine oil insufficient Replenish G-18 Engine Is Running Oil pressure switch defective...

  • Page 305: Servicing Specifications

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM 2. SERVICING SPECIFICATIONS STARTER Item Factory Specification Allowable Limit Commutator O.D. 28.0 mm 27.0 mm 1.10 in. 1.06 in. Difference of Less than 0.05 mm O.D.'s 0.02 mm 0.002 in. 0.0008 in. Mica Undercut 0.60 mm...

  • Page 306: Checking, Disassembling And Servicing

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM 3. CHECKING, DISASSEMBLING AND SERVICING 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 is running.
  • Page 307 ELECTRICAL SYSTEM B1220, B1620, B1820, WSM Battery Specific Gravity 1. Check the specific gravity of the electrolyte in each cell with a hydrometer. 2. When the electrolyte temperature differs from that at which the hydrometer was calibrated, correct the specific gravity reading following the formula mentioned in (Reference).

  • Page 308: Main Switch

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM (2) Main Switch Main Switch 1. Remove the steering wheel and the meter panel. 2. Disconnect the 4P connector (1) and remove the main switch (2). 3. Perform the following checks. (1) 4P Connector...

  • Page 309: Key Stop Solenoid

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM 3) Main Switch Key at PREHEAT Position 1. Set and hold the main switch key at the PREHEAT position. 2. Measure the resistance with an ohmmeter across the B terminal and the 19 terminal, and measure the resistance across the B terminal and the AC terminal.

  • Page 310: Key Stop Solenoid Relay

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM (4) Key Stop Solenoid Relay Connector Voltage 1. Disconnect the connector from the key stop solenoid relay after turning the main switch off. 2. Measure the voltage with a voltmeter across the connector 4 terminal and chassis.

  • Page 311: Timer Relay 2 (With Opc Type)

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM (5) Timer Relay 2 (With OPC Type) Connector Voltage 1. Disconnect the connector from the timer relay 2 after turning the main switch off. 2. Measure the voltage with a voltmeter across the connector 1 terminal and chassis.

  • Page 312: Relay (2M) (With Opc Type)

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM (6) Relay (2M) (With OPC Type) Connector Voltage 1. Disconnect the connector from the relay (2M) after turning the main switch off. 2. Apply the battery voltage between terminal 1 and 2. 3. Check for continuity between terminal 3 and 5.

  • Page 313: Glow Plug

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM (8) Glow Plug 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 314: Safety Switches

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM (9) Safety Switches [A] Without OPC Type Safety Switch Continuity 1. Disconnect the safety switch connectors. 2. Connect the circuit tester to the safety switch connectors. 3. Measure the resistance between connectors. 4. If the safety switch is defective, replace it.
  • Page 315 ELECTRICAL SYSTEM B1220, B1620, B1820, WSM Rear PTO Switch Check 1. Disconnect the 2P connector from the rear PTO switch (2). 2. Connect the circuit tester leads to the rear PTO switch 2P connector. (When the PTO gear shift lever is in "NEUTRAL" position) 1.
  • Page 316 ELECTRICAL SYSTEM B1220, B1620, B1820, WSM [B] B1220 (With OPC Type) Safety Switch Continuity 1. Disconnect the safety switch connectors. 2. Connect the circuit tester to the safety switch connectors. 3. Measure the resistance between connectors. 4. If the safety switch is defective, replace it.
  • Page 317 ELECTRICAL SYSTEM B1220, B1620, B1820, WSM Rear PTO Switch Check 1. Disconnect the 2P connector from the rear PTO switch (2). 2. Connect the circuit tester leads to the rear PTO switch 2P connector. (When the PTO gear shift lever is in "NEUTRAL" position) 1.
  • Page 318 ELECTRICAL SYSTEM B1220, B1620, B1820, WSM Parking Brake Switch Check 1. Disconnect the parking brake switch. 2. Connect the circuit tester leads to the parking brake switch terminals. (When switch is not pushed) 1. Measure the resistance between terminals. 2. If the continuity is not infinity, the switch is faulty, replace it.
  • Page 319 ELECTRICAL SYSTEM B1220, B1620, B1820, WSM [C] B1620 and B1820 (With OPC Type) Safety Switch Continuity 1. Disconnect the safety switch connectors. 2. Connect the circuit tester to the safety switch connectors. 3. Measure the resistance between connectors. 4. If the safety switch is defective, replace it.
  • Page 320 ELECTRICAL SYSTEM B1220, B1620, B1820, WSM Rear PTO Switch Check 1. Disconnect the 2P connector from the rear PTO switch (2). 2. Connect the circuit tester leads to the rear PTO switch 2P connector. (When the PTO gear shift lever is in "NEUTRAL" position) 1.
  • Page 321 ELECTRICAL SYSTEM B1220, B1620, B1820, WSM Parking Brake Switch Check 1. Disconnect the parking brake switch. 2. Connect the circuit tester leads to the parking brake switch terminals. (When switch is not pushed) 1. Measure the resistance between terminals. 2. If the continuity is not infinity, the switch is faulty, replace it.
  • Page 322 ELECTRICAL SYSTEM B1220, B1620, B1820, WSM [D] B1620 and B1820 (With OPC and PTO Gear Shift Lever Switch Type) Safety Switch Continuity See page 9-S22 9Y1210272ELS0081US0 Main Gear Shift Switch Check See page 9-S22 9Y1210272ELS0082US0 Rear PTO Switch Check See page 9-S23...

  • Page 323: Starter

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM (10) 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 form the starter M terminal.

  • Page 324: Regulator [B1220] (Without Opc Type)

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM (12) Regulator [B1220] (Without OPC Type) Continuity Across Regulator's Terminals 1. Remove the regulator. 2. Check with a tester whether the regulator is in optimum condition or not. 3. If the continuity is not measured as show in the table below, the contacts of the regulator are faulty.

  • Page 325: Regulator [B1220] (With Opc Type)

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM (13) Regulator [B1220] (With OPC Type) Continuity Across Regulator's Terminals 1. Remove the regulator. 2. Check with a tester whether the regulator is in optimum condition or not. 3. If the continuity is not measured as show in the table below, the contacts of the regulator are faulty.

  • Page 326: Alternator [B1620 And B1820]

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM (14) Alternator [B1620 and B1820] Alternator 1. Disconnect the 2P connector (3) from alternator after turning the main switch OFF. 2. Perform the following checkings. (1) B Terminal (3) 2P Connector (2) Alternator 9Y1210272ELS0025US0 Connector Voltage 1.

  • Page 327: Head Light Switch [B1220]

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM (15) Head Light Switch [B1220] Head Light Switch 1. Remove the steering wheel and steering boot. 2. Disconnect the head light switch connector. 3. Remove the head light switch (1) and perform the following 1) to...

  • Page 328: Combination Switch [B1620 And B1820]

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM (16) Combination Switch [B1620 and B1820] Combination Switch 1. Remove the steering wheel and steering boot. 2. Disconnect the combination switch connector. 3. Remove the combination switch (1) and perform the following checks 1) to 8).
  • Page 329 ELECTRICAL SYSTEM B1220, B1620, B1820, WSM 5) Turn Signal Light Switch Continuity When Setting Switch Knob at L Position 1. Set the turn signal light switch to the L position. 2. Measure the resistance with an ohmmeter across the B2 terminal and L terminal.

  • Page 330: Hazard Switch [B1620 And B1820]

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM (17) Hazard Switch [B1620 and B1820] Hazard Switch 1. Remove the steering wheel and steering boot. 2. Disconnect the 4P connector from hazard switch after disconnect the battery negative cable. 3. Remove the hazard switch.

  • Page 331: Brake Switch [B1620 And B1820]

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM (18) Brake Switch [B1620 and B1820] Brake Switch 1. Disconnect the leads, and measure the resistance with an ohmmeter across the brake switch leads. 2. If the measurement differs from the table below, the brake switch is faulty or need to adjust the brake switch position.

  • Page 332: Flasher Unit [B1620 And B1820]

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM (19) Flasher Unit [B1620 and B1820] Flasher Unit 1. Disconnect the connector from the flasher unit. 2. Turn the main switch at ON position. 3. Measure the voltage between the terminal 12, 13 and chassis.

  • Page 333: Easy Checker

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM (20) Easy Checker™ Easy Checker™ 1. Remove the panel board and disconnect the meter panel connector (1) from it. 2. Turn the main switch on. 3. Measure the voltage with a voltmeter across the terminal (Red / Yellow) and the earth terminal (Black).
  • Page 334 ELECTRICAL SYSTEM B1220, B1620, B1820, WSM Monitor Lamp (for Charge, Engine Oil Pressure, Pre-heat, Illumination) [B1220] 1. Removing the meter panel from the tractor. 2. Remove the each lamp. 3. Measure the lamp resistance. 4. If it is infinity, replace the lamp with new.

  • Page 335: Gauge

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM (21) Gauge Fuel Level Sensor 1) Sensor Continuity 1. Remove the fuel level sensor from the fuel tank. 2. Measure the resistance with an ohmmeter across the sensor terminal and its body. 3. If the reference values are not indicated, the sensor is faulty.

  • Page 336: Disassembling And Assembling

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM [2] 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...

  • Page 337: Ac Dynamo [B1220]

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM (2) AC Dynamo [B1220] Stator 1. Remove the nut (3) and separate the stator comp. (4). 2. Unscrew the screws (1) and remove the stator (2). (1) Screw (3) Nut (2) Stator (4) Stator Comp.
  • Page 338 ELECTRICAL SYSTEM B1220, B1620, B1820, WSM IC Regulator 1. Unscrew the three screws holding the IC regulator, and remove the IC regulator (1). (1) IC Regulator WSM000001ELS0026US0 Rectifier 1. Remove the four screws holding the rectifier and the stator lead wires.
  • Page 339 ELECTRICAL SYSTEM B1220, B1620, B1820, WSM Bearing on Drive End Side 1. Press out the bearing from drive end frame (3) with a press and jig (1). (1) Jig (3) Drive End Frame (2) Block WSM000001ELS0031US0 Bearing at Slip Ring Side 1.

  • Page 340: Servicing

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM [3] 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 341: Alternator

    ELECTRICAL SYSTEM B1220, B1620, B1820, WSM 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 342 ELECTRICAL SYSTEM B1220, B1620, B1820, WSM 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.
  • Page 343 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 : ksos-pub@kubota.co.jp Printed in Japan 2011. 07, S, EI, EI, e Code No.9Y111-02723 KUBOTA Corporation 2009.

This manual is also suitable for:

B1620B1820

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