wsm B2420 Workshop Manual
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wsm B2420 Workshop Manual

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WORKSHOP MANUAL
TRACTOR
B2420
KiSC issued 06, 2012 A

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  • Page 1 WORKSHOP MANUAL TRACTOR B2420 KiSC issued 06, 2012 A...
  • Page 2 TO THE READER This Workshop Manual tells the servicing personnel about the mechanism, servicing and maintenance of the B2420. It contains 4 parts: "Information", "General", "Mechanism" and "Servicing". Information This section contains information below. • Safety First • Safety Decal •...
  • Page 3 INFORMATION KiSC issued 06, 2012 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 06, 2012 A...

  • Page 5: Safety First

    B2420, WSM INFORMATION 1. SAFETY FIRST SAFETY FIRST • This symbol, the industry's "Safety Alert Symbol", is used throughout this manual and on labels on the machine itself to warn of the possibility of personal injury. Read these instructions carefully.
  • Page 6 B2420, WSM INFORMATION OPERATE SAFELY • Do not use the machine after you consume alcohol or medication or when you are tired. • Put on applicable clothing and safety equipment. • Use applicable tools only. Do not use alternative tools or parts.
  • Page 7 B2420, WSM INFORMATION KEEP A GOOD AIRFLOW IN THE WORK AREA • If the engine is in operation, make sure that the area has good airflow. Do not operate the engine in a closed area. The exhaust gas contains poisonous carbon monoxide.

  • Page 8: Safety Decals

    B2420, WSM INFORMATION 2. SAFETY DECALS The following safety decals (pictorial safety labels) are installed on the machine. If a decal becomes damaged, illegible or is not on the machine, replace it. The decal part number is listed in the parts list.
  • Page 9 B2420, WSM INFORMATION 9Y1210436INI0009US0 CARE OF PICTORIAL SAFETY LABELS 1. Keep pictorial safety labels clean and free from obstructing material. 2. Clean pictorial safety labels with soap and water, dry with a soft cloth. 3. Replace damaged or missing pictorial safety labels with new labels.

  • Page 10: Specifications

    B2420, WSM INFORMATION 3. SPECIFICATIONS Model B2420 PTO power* 14.3 kW (19.4 HP)* Maker KUBOTA Model D1105-D22I Type E-TVCS, liquid-cooled, 3-cylinder diesel Number of cylinder Bore and stroke 78.0 × 78.4 mm (3.07 × 3.09 in.) Engine Total displacement 1123 cm (68.53 cu.in.)

  • Page 11: Traveling Speeds

    B2420, WSM INFORMATION 4. TRAVELING SPEEDS Model B2420 Tire size (Rear) 8-16 Farm 9.5-16 Farm 9.5-18 Farm Range gear Main gear km/h (mph) km/h (mph) km/h (mph) shift lever shift lever 1.0 (0.62) 1.1 (0.68) 1.2 (0.75) 1.5 (0.93) 1.6 (0.99) 1.7 (1.1)

  • Page 12: Dimensions

    B2420, WSM INFORMATION 5. DIMENSIONS 9Y1210436INI0006US0 KiSC issued 06, 2012 A...
  • Page 13 GENERAL KiSC issued 06, 2012 A...
  • Page 14 GENERAL CONTENTS 1. TRACTOR IDENTIFICATION....................... G-1 [1] MODEL NAME AND SERIAL NUMBER ................G-1 [2] CYLINDER NUMBER ......................G-1 2. GENERAL PRECAUTIONS......................G-2 3. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING ........G-3 [1] WIRING ..........................G-3 [2] BATTERY ..........................G-5 [3] FUSE ............................

  • Page 15: Tractor Identification

    B2420, WSM GENERAL 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 (3) Engine Serial Number...

  • Page 16: General Precautions

    B2420, WSM GENERAL 2. GENERAL PRECAUTIONS • When you disassemble, carefully put the parts in a clean area to make it easy to find the parts. You must install the screws, bolts and nuts in their initial position to prevent the reassembly errors.

  • Page 17: Handling Precautions For Electrical Parts And Wiring

    B2420, WSM GENERAL 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 18 B2420, WSM GENERAL • 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 19: Battery

    B2420, WSM GENERAL [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 20: Handling Of Circuit Tester

    B2420, WSM GENERAL • 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 21: Color Of Wiring

    B2420, WSM GENERAL [6] COLOR OF WIRING • Colors of wire are specified to the color codes. • This symbol of "/" shows color with stripe(s). (An example) Red stripe on white color: W/R Color of wiring Color code Black...

  • Page 22: Lubricants, Fuel And Coolant

    B2420, WSM GENERAL 4. LUBRICANTS, FUEL AND COOLANT Place Capacity Lubricants, fuel and coolant 26 L • No. 2-D diesel fuel Fuel tank 6.9 U.S.gals • No. 1-D diesel fuel if temperature 5.7 Imp.gals is below −10 °C (14 °F) 3.9 L...
  • Page 23 B2420, WSM GENERAL NOTE Engine Oil • Oil used in the engine should have an American Petroleum Institute (API) service classification and Proper SAE Engine Oil according to the ambient temperatures as shown above: • With the emission control now in effect, the CF-4 and CG-4 lubricating oils have been developed for use of a low-sulfur fuel on on-road vehicle engines.

  • Page 24: Tightening Torques

    B2420, WSM GENERAL 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 25: Metric Screws, Bolts And Nuts

    B2420, WSM GENERAL [3] METRIC SCREWS, BOLTS AND NUTS Grade Property class 8.8 Property class 10.9 Unit N·m kgf·m lbf·ft N·m kgf·m lbf·ft 24 to 27 2.4 to 2.8 18 to 20 30 to 34 3.0 to 3.5 22 to 25 48 to 55 4.9 to 5.7...

  • Page 26: Maintenance Check List

    B2420, WSM GENERAL 6. MAINTENANCE CHECK LIST Indication on hour meter Refer- Item Interval ence 50 100 150 200 250 300 350 400 450 500 550 600 650 700 page every 1 Engine oil Change G-15 200 Hr every 2 Engine oil filter...
  • Page 27 B2420, WSM GENERAL Indication on hour meter Refer- Item Interval ence 50 100 150 200 250 300 350 400 450 500 550 600 650 700 page 25 Fuel system Bleed G-31 Service 26 Clutch housing water Drain G-31 as re-...

  • Page 28: Check And Maintenance

    B2420, WSM GENERAL 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. 9Y1210436GEG0004US0 [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 29: Check Points Of Initial 50 Hours

    B2420, WSM GENERAL [2] CHECK POINTS OF INITIAL 50 HOURS Changing Engine Oil CAUTION To avoid personal injury: • Be sure to stop the engine and remove the key before changing the oil. • Allow engine to cool down sufficiently, oil can be not and can burn.
  • Page 30 B2420, WSM GENERAL Checking Clutch Pedal Free Travel 1. Stop the engine and remove the key. 2. Slightly depress the clutch pedal (1) and measure free travel at top of pedal stroke. 3. If adjustment is needed, loosen the lock nut (3) and turn the turnbuckle (2) to adjust the rod length within in acceptable limits.

  • Page 31: Check Points Of Every 50 Hours

    B2420, WSM GENERAL [3] CHECK POINTS OF EVERY 50 HOURS Greasing 1. Apply a grease to the following position as figures. (1) Grease Fitting (Brake Pedal) (5) Grease Fitting (Lifting Rod, R.H.) (2) Grease Fitting (Clutch Pedal) (6) Grease Fitting (Parking Brake)
  • Page 32 B2420, WSM GENERAL Checking Engine Start System (Serial Number Below 33597) CAUTION • Do not allow anyone near the tractor while testing. • If the tractor does not pass the test do not operate the tractor. Preparation before testing 1. Sit on operator's seat.
  • Page 33 B2420, WSM GENERAL Checking Engine Start System (Serial Number Above 33598) CAUTION To avoid personal injury: • Do not allow anyone near the tractor while testing. • If the tractor does not pass the test do not operate the tractor.

  • Page 34: Check Points Of Every 100 Hours

    B2420, WSM GENERAL [4] CHECK POINTS OF EVERY 100 HOURS Adjusting Clutch Pedal Free Travel 1. See page G-16. 9Y1210436GEG0034US0 Checking Battery Condition DANGER To avoid the possibility of battery explosion: For the refillable type battery, follow the instructions below.
  • Page 35 B2420, WSM GENERAL (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. • When charging battery, ensure the vent caps are securely in place.
  • Page 36 B2420, WSM GENERAL Cleaning Air Cleaner Element 1. Remove the air cleaner cover (3) and primary element (2). 2. Clean the primary element if: – 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 37 B2420, WSM GENERAL Adjusting 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 38: Check Points Of Every 200 Hours

    B2420, WSM GENERAL Adjusting Parking Brake CAUTION • Stop the engine and chock the wheels before checking parking brake pedal. 1. Check free travel of the parking brake pedal (1). 2. If adjustment is needed, pull the parking release lever (2) to release the parking brake, and then loosen the lock nut (3) and the adjust nut (4).

  • Page 39: Check Points Of Every 400 Hours

    B2420, WSM GENERAL Checking Radiator Hose and Hose Clamp Check to see if radiator hoses (1) are properly fixed every 200 hours of operation or six months, whichever comes first. 1. If hose clamps (2) are loose or water leaks, tighten bands securely.
  • Page 40 B2420, WSM GENERAL Changing Transmission Fluid / Replacing Hydraulic Oil Filter CAUTION To avoid personal injury: • Be sure to stop the engine before changing the oil filter cartridge. • Allow engine to cool down sufficiently, oil can be hot and can burn.

  • Page 41: Check Point Of Every 800 Hours

    B2420, WSM GENERAL Changing Front Axle Case Oil 1. Place the oil pans underneath the front axle case. 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).

  • Page 42: Check Points Of Every 2 Years

    B2420, WSM GENERAL [11] CHECK POINTS OF EVERY 2 YEARS Replacing Fuel Hoses • See page G-24. 9Y1210436GEG0049US0 Replacing Intake Air Hoses • See page G-24. 9Y1210436GEG0050US0 Replacing Radiator Hoses • See page G-25. 9Y1210436GEG0051US0 Flushing Cooling System and Changing Coolant...
  • Page 43 B2420, WSM GENERAL (Continued) Anti-Freeze CAUTION To avoid personal injury: • 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 44 B2420, WSM GENERAL (Continued) IMPORTANT • When the antifreeze is mixed with water, the antifreeze mixing ratio must be less than 50 %. Freezing Point Boiling Point* Vol % Anti-freeze °C °F °C °F −24 −12 −37 −34 *At 1.013 × 10 Pa (760 mmHg) pressure (atmospheric).

  • Page 45: Others

    B2420, WSM GENERAL [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 46 B2420, WSM GENERAL Replacing Fuse (Serial Number Above 33598) 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 47: Special Tools

    B2420, WSM GENERAL 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. • 07909-32111 Application •...
  • Page 48 B2420, WSM GENERAL 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 49 B2420, WSM GENERAL 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 50 B2420, WSM GENERAL 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 51 B2420, WSM GENERAL 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 52 B2420, WSM GENERAL 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 53: Special Tools For Tractor

    B2420, WSM GENERAL [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 54 B2420, WSM GENERAL Clutch Center Tool (For B and L Series Tractors) Application • The clutch center tool can be used for all B and L series tractors with a diaphragm clutch by changing tip guides. Center piece diameter is 14 mm (0.55 in.).
  • Page 55 B2420, WSM GENERAL NOTE • The following special tools are not provided, so make them referring to the figure. WSM000001GEG0026US0 Bevel Gear Shaft (10T) Tool Application • Use for measuring and tightening the bevel gear shaft. 6.4 to 6.6 mm square (0.25 to 0.26 in. square) 17.5 mm dia.
  • Page 56 B2420, WSM GENERAL Disassembling Stand Application • Use for supporting engine. NOTE • This special tool is not provided, so make it referring to figure. 150 mm (5.91 in.) 9 mm (0.4 in.) 244 mm (9.61 in.) 100 mm (3.94 in.) 110 mm (4.33 in.)
  • Page 57 B2420, WSM GENERAL 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 58 B2420, WSM GENERAL Bushing Replacing Tool, for 4WD front Axle Bracket (Rear) Application • Use to press fit the bushing. 130 mm (5.12 in.) 71 mm (2.9 in.) 15 mm (0.59 in.) 14 mm (0.55 in.) 30 mm (1.2 in.) 40 mm dia.
  • Page 59 B2420, WSM GENERAL Adaptor Joint Application • Use for connecting the adaptor 66 to the hydraulic pump (power steering side). NOTE • This special tool is not provided, so make it referring to figure G 1/4 10.5 mm dia. (0.413 in. dia.) 3 mm (0.1 in.)

  • Page 60: Tires

    B2420, WSM GENERAL 9. TIRES [1] TIRE PRESSURE WARNING To avoid personal injury: • Do not attempt to mount a tire on a rim. this should be done by a qualified person with the proper equipment. • Always maintain the correct tire pressure.

  • Page 61: Tread Adjustment

    B2420, WSM GENERAL [2] TREAD ADJUSTMENT CAUTION To avoid personal injury: • When working on slopes or when working with trailer, set the wheel tread as wide as practical for maximum stability. • Support tractor securely on stands before removing a wheel.

  • Page 62: Rear Wheels

    B2420, WSM GENERAL (2) Rear Wheels IMPORTANT • Always attach tires as shown in the figures. • If not attached as illustrated, transmission parts may be damaged. • When re-fitting or adjusting a wheel, tighten the bolts to the following torques then recheck after driving the tractor 200 m (200 yards) and there after daily check service.

  • Page 63: Tire Liquid Injection

    B2420, WSM GENERAL [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 64 B2420, WSM GENERAL 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 65: Implement Limitations

    B2420, WSM GENERAL 10. IMPLEMENT LIMITATIONS The KUBOTA Tractor has been thoroughly tested for proper performance with implements sold or approved by KUBOTA. Use with implements which are not sold or approved by KUBOTA and which exceed the maximum specifications listed below, or which are otherwise unfit for use with the KUBOTA Tractor may result in malfunctions or failures of the tractor, damage to other property and injury to the operator or others.
  • Page 66 B2420, WSM GENERAL Implement Remarks B2420 Rotary-cutter Max. cutting width 122 cm (48.0 in.) (1 Blade) Max. weight 204 kg (450 lbs) Rear-mount Max. cutting width 152 cm (59.8 in.) Mower (2 or 3 Blades) Max. weight 227 kg (500 lbs) Flail-mower Max.
  • Page 67 ENGINE KiSC issued 06, 2012 A...
  • Page 68 MECHANISM CONTENTS LUBRICATING SYSTEM......................1-M1 2. COOLING SYSTEM ........................1-M2 3. FUEL SYSTEM........................... 1-M3 KiSC issued 06, 2012 A...
  • Page 69 B2420, WSM ENGINE 1. LUBRICATING SYSTEM (1) Rocker Arm (2) Oil Pressure Switch (3) Rocker Arm Shaft (4) Valve (5) Governor Shaft (6) Idle Gear (7) Crankshaft (8) Oil Pump (9) Oil Strainer (10) Relief Valve (11) Push Rod (12) Tappet...
  • Page 70 B2420, WSM ENGINE 2. COOLING SYSTEM (1) Radiator (2) Cooling Fan (3) Thermostat (4) Water Pump (5) Cylinder Head Water Jacket (6) Cylinder Block Water Jacket The cooling system consists of a radiator (1), a centrifugal water pump (4), a cooling fan (2) and a thermostat (3).
  • Page 71 B2420, WSM ENGINE 3. FUEL SYSTEM (1) Fuel Tank (2) Fuel Overflow Pipe (3) Injection Nozzle (4) Fuel Injection Pipe (5) Injection Pump (6) Fuel Feed Pump (7) Fuel Filter (a) Fuel Flow Fuel from the fuel tank (1) passes thought the fuel filter (7), and then enters the injection pump (5) after impurities such as dirt, water, etc.
  • Page 72 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-S12 (4) Fuel System........................1-S15 [2] PREPARATION ........................1-S19 (1) Separating Engine from Tractor ..................1-S19 (2) External Components ....................1-S27 [3] DISASSEMBLING AND ASSEMBLING ................1-S28 (1) Cylinder Head and Valves .....................1-S28...

  • Page 73: Troubleshooting

    B2420, WSM ENGINE 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Engine Does Not No fuel Replenish fuel Start Air in the fuel system Bleed G-31 Water in the fuel system Change fuel and – repair or replace fuel system...
  • Page 74 B2420, WSM ENGINE Reference Symptom Probable Cause Solution Page Either White or Blue Excessive engine oil Reduce to specified G-15 Exhaust Gas Is level Observed Piston ring and cylinder worn or stuck Repair or replace 1-S49 Incorrect injection timing Adjust...
  • Page 75 B2420, WSM ENGINE Reference Symptom Probable Cause Solution Page Low Oil Pressure Engine oil insufficient Replenish G-15 Oil strainer clogged Clean 1-S34 Oil filter cartridge clogged Replace 1-S15 Relief valve stuck with dirt Clean – Relief valve spring weaken or broken Replace –...

  • Page 76: Servicing Specifications

    B2420, WSM ENGINE 2. SERVICING SPECIFICATIONS ENGINE BODY Item Factory Specification Allowable Limit Cylinder Head Surface Flatness – 0.05 mm 0.002 in. Top Clearance 0.55 to 0.75 mm – 0.022 to 0.029 in. Compression Pressure (When Cranking with Starter Motor) 3.73 to 4.11 MPa...
  • Page 77 B2420, WSM ENGINE Item Factory Specification Allowable Limit Rocker Arm Shaft to Rocker Arm Clearance 0.016 to 0.045 mm 0.10 mm 0.00063 to 0.0017 in. 0.0039 in. • Rocker Arm Shaft O.D. 11.973 to 11.984 mm – 0.47138 to 0.47181 in.
  • Page 78 B2420, WSM ENGINE Item Factory Specification Allowable Limit Idle Gear Shaft to Idle Gear Bushing Clearance 0.020 to 0.054 mm 0.10 mm 0.00079 to 0.0021 in. 0.0039 in. • Idle Gear Shaft O.D. 25.967 to 25.980 mm – 1.0224 to 1.0228 in.
  • Page 79 B2420, WSM ENGINE Item Factory Specification Allowable Limit Crankshaft Journal to Crankshaft Bearing 3 Oil Clearance 0.034 to 0.098 mm 0.20 mm 0.0013 to 0.004 in. 0.0079 in. • Crankshaft Journal O.D. 51.921 to 51.940 mm – 2.0441 to 2.0449 in.
  • Page 80 B2420, WSM ENGINE COOLING SYSTEM Item Factory Specification Allowable Limit Thermostat • Valve Opening Temperature At Beginning 69.5 to 72.5 °C – 157.1 to 162.5 °F Opened 85 °C – Completely 185 °F Radiator Water Leakage No leak at –...

  • Page 81: Tightening Torques

    B2420, WSM ENGINE 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts: See page G-10.) [TRACTOR BODY] Item N·m kgf·m lbf·ft Steering wheel mounting nut 30 to 49 3.0 to 5.0...

  • Page 82: Checking, Disassembling And Servicing

    B2420, WSM ENGINE 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 83 B2420, WSM ENGINE 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 84: Lubricating System

    B2420, WSM ENGINE (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 85 B2420, WSM ENGINE Fan Belt Damage and Wear 1. Check the fan belt for damage. 2. If the fan belt is damaged, replace it. 3. Check if the fan belt is worn and sunk in the pulley groove. 4. If the fan belt is nearly worn out and deeply sunk in the pulley groove, replace it.
  • Page 86 B2420, WSM ENGINE 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 87: Fuel System

    B2420, WSM ENGINE (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 88 B2420, WSM ENGINE Fuel Tightness of Pump Element 1. Remove the engine stop solenoid. 2. Remove the injection pipes and glow plugs. 3. Install the injection pump pressure tester to the injection pump. 4. Install the injection nozzle (1) jetted with the proper injection pressure to the injection pump pressure tester (2).
  • Page 89 B2420, WSM ENGINE 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 90 B2420, WSM ENGINE Nozzle Holder 1. Secure the nozzle retaining nut (7) with a vise. 2. Remove the nozzle holder (1), and take out parts inside. (When reassembling) • Assemble the nozzle in clean fuel oil. • Install the push rod (4), noting its direction.

  • Page 91: Preparation

    B2420, WSM ENGINE [2] PREPARATION (1) Separating Engine from Tractor Mid Mount ROPS [If Equipped] CAUTION To avoid personal injury: • Adjust free fall after confirming that no bystanders are nearby. • Sudden movement may occur as a result of improper adjustment.
  • Page 92 B2420, WSM ENGINE 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 93 B2420, WSM ENGINE 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 94 B2420, WSM ENGINE 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 plugs (1). (When refilling) • Fill new oil from filling port after removing the filling plug (2) up to the upper notch on the dipstick (3).
  • Page 95 B2420, WSM ENGINE Meter Panel and Panel Under Cover 1. Tap out the spring pin (2) and remove the hand accelerator lever (1). 2. Open the meter panel (3) and disconnect the hourmeter cable, meter panel connector (6), combination switch connector (4) and hazard switch connector (7).
  • Page 96 B2420, WSM ENGINE Fuel Tank 1. Disconnect the fuel hose (2) at the fuel filter side, then drain fuel completely. 2. Disconnect the wire harness clamps (1). 3. Remove the fuel tank frame stay (4). Disconnect the overflow hoses (3) and pull out the hour meter cable (5).
  • Page 97 B2420, WSM ENGINE Hydraulic Pipes and Drag Link 1. Remove the accelerator rod (2). 2. Remove the power steering delivery pipe (1). 3. Disconnect the pipe clamp and disconnect the 3-point hitch delivery pipe (3). 4. Disconnect the suction hose (4).
  • Page 98 B2420, WSM ENGINE Separating the Engine from the Clutch Housing 1. Place the disassembling jack under the engine and center frame. 2. Remove the engine mounting screws and nut, then separate the engine from the clutch housing with starter motor.

  • Page 99: External Components

    B2420, WSM ENGINE (2) External Components Outer Parts of Engine 1. Remove the cooling fan (1), fan belt (3), fan pulley, hour meter cable (2), alternator and radiator hoses. 2. Remove the air cleaner (5), inlet hose (4) and air cleaner bracket.

  • Page 100: Disassembling And Assembling

    B2420, WSM ENGINE [3] DISASSEMBLING AND ASSEMBLING (1) Cylinder Head and Valves Cylinder Head Cover 1. Remove the cylinder head cover cap nut. 2. Remove the cylinder head cover (1). (When reassembling) • Check to see if the cylinder head cover gasket is not defective.
  • Page 101 B2420, WSM ENGINE Rocker Arm and Push Rod 1. Remove the rocker arm bracket nuts. 2. Detach the rocker arm assembly (1). 3. Remove the push rods (2). (When reassembling) • When putting the push rods (2) onto the tappets (3), check to see if their ends are properly engaged with the dimples.

  • Page 102: Timing Gears, Camshaft And Fuel Camshaft

    B2420, WSM ENGINE Tappets 1. Remove the tappets from the crankcase. (When reassembling) • Visually check the contact between tappets and cams for proper rotation. If defect is found, replace tappets. • Before installing the tappets, apply engine oil thinly around them.
  • Page 103 B2420, WSM ENGINE Water Pump 1. Remove the water pump flange. (When reassembling) • Before installing the water pump flange gasket, apply liquid gasket (Three Bond 1215 or equivalent) to the both side. 9Y1210436ENS0041US0 Gear Case 1. Remove the gear case.
  • Page 104 B2420, WSM ENGINE Injection Pump 1. Remove the injection pump mounting screws and nuts. 2. Align the control rack pin (2) with the notch (3) on the crankcase, then remove the injection pump (1). 3. Remove the injection pump timing shims.
  • Page 105 B2420, WSM ENGINE Governor Shaft 1. Remove the external snap ring (1) from the governor shaft (2). 2. Pull out the governor shaft (2). (When reassembling) • Make sure assembling the external snap ring of the governor shaft. • Check the governor shaft for smooth rotation.

  • Page 106: Piston And Connecting Rod

    B2420, WSM ENGINE (3) Piston and Connecting Rod Oil Pan and Oil Strainer 1. Remove the oil pan mounting screws. 2. Remove the oil pan (4) by lightly tapping the rim of the pan with a wooden hammer. 3. Remove the oil strainer (3).
  • Page 107 B2420, WSM ENGINE Piston 1. Turn the flywheel and bring the piston to top dead center. 2. Draw out the piston upward by lightly tapping it from the bottom of the crankcase with the grip of a hammer. 3. Draw out the other piston in the same method as above.
  • Page 108 B2420, WSM ENGINE Piston Ring and Connecting Rod 1. Remove the piston rings using a piston ring tool. 2. Remove the piston pin (7), and separate the connecting rod (6) from the piston (5). (When reassembling) • When installing the ring, assemble the rings so that the manufacturer's mark (12) near the gap faces the top of the piston.

  • Page 109: Flywheel And Crankshaft

    B2420, WSM ENGINE (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) • Align the "1TC" mark (a) on the outer surface of the flywheel horizontally with the alignment mark (b) on the rear end plate.

  • Page 110: Thermostat And Water Pump

    B2420, WSM ENGINE Crankshaft Assembly 1. Remove the main bearing case screw 2 (1). 2. Pull out the crankshaft assembly. IMPORTANT • Take care to protect crankshaft bearing 1 from scratches, caused by the crank gear, etc.. (Wrap the crank gear in vinyl tape, etc..)

  • Page 111: Injection Nozzle

    B2420, WSM ENGINE Water Pump Assembly 1. Loosen the alternator mounting bolts, and remove the fan belt. 2. Remove the fan and fan pulley. 3. Remove the water Pump assembly from the gear case cover. 4. Remove the water pump flange (1).

  • Page 112: Servicing

    B2420, WSM ENGINE [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 plastigage [1.5 mm dia.
  • Page 113 B2420, WSM ENGINE Cylinder Head Flaw 1. Prepare an air spray red check (Code No. 07909-31371). 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 114 B2420, WSM ENGINE Replacing Valve Guide (When removing) 1. Press out the used valve guide using a valve guide replacing tool. (When installing) 1. Clean a new valve guide and valve guide bore, and apply engine oil to them. 2. Press in a new valve guide using a valve guide replacing tool.
  • Page 115 B2420, WSM ENGINE 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 116 B2420, WSM ENGINE Free Length and Tilt of Valve Spring 1. Measure the free length (B) of valve spring with vernier calipers. If the measurement is less than the allowable limit, replace it. 2. Put the valve spring on a surface plate, place a square on the side of the valve spring.

  • Page 117: Timing Gears, Camshaft And Governor Gear

    B2420, WSM ENGINE Push Rod Alignment 1. Place the push rod on V blocks. 2. Measure the push rod alignment. 3. If the measurement exceeds the allowable limit, replace the push rod. 0.25 mm Push rod alignment Allowable limit 0.0098 in.
  • Page 118 B2420, WSM ENGINE Idle Gear Side Clearance 1. Set a dial indicator with its tip on the idle gear. 2. Measure the side clearance by moving the idle gear to the front and rear. 3. If the measurement exceeds the allowable limit, replace the idle gear collar.
  • Page 119 B2420, WSM ENGINE Oil Clearance of Camshaft Journal 1. Measure the camshaft journal O.D. with an outside micrometer. 2. Measure the cylinder block bore I.D. for camshaft with a cylinder gauge, and calculate the oil clearance. 3. If the oil clearance exceeds the allowable limit, replace the camshaft.

  • Page 120: Piston And Connecting Rod

    B2420, WSM ENGINE (3) Piston and Connecting Rod Piston Pin Bore I.D. 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 121 B2420, WSM ENGINE 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. 2. Install the connecting rod on the connecting rod alignment tool.

  • Page 122: Crankshaft

    B2420, WSM ENGINE Clearance between Piston ring and Piston Ring Groove 1. Clean the rings and the ring grooves, and install each ring in its groove. 2. Measure the clearance between the ring and the groove with a feeler gauge or depth gauge.
  • Page 123 B2420, WSM ENGINE 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 124 B2420, WSM ENGINE Oil Clearance between Crankshaft Journal and Crankshaft Bearing 1 1. Measure the O.D. of the crankshaft front journal with an outside micrometer. 2. Measure the I.D. of the crankshaft bearing 1 with an inside micrometer, and calculate the oil clearance.
  • Page 125 B2420, WSM ENGINE Oil Clearance between Crankshaft Journal and Crankshaft Bearing 2 (Crankshaft Bearing 3) 1. Put a strip of plastigage on the center of the journal. 2. Install the bearing case and tighten the baring case screws 1 to the specified torque, and remove the bearing case again.

  • Page 126: Cylinder

    B2420, WSM ENGINE Replacing Crankshaft Sleeve 1. Remove the used crankshaft sleeve. 2. Set the sleeve guide (2) to the crankshaft. 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 127: Oil Pump

    B2420, WSM ENGINE Correcting Cylinder 1. When the cylinder is worn beyond the allowable limit, bore and hone it to the specified dimension. 78.500 to 78.519 mm Factory specification 3.0906 to 3.0912 in. Oversized cylinder liner I.D. 78.65 mm Allowable limit 3.096 in.

  • Page 128: Thermostat

    B2420, WSM ENGINE (7) Thermostat Thermostat Valve Opening Temperature 1. Suspend the thermostat in the water by a string with its end inserted between the valve and seat. 2. Heating the water gradually, read the temperature when the valve opens and leaves the string.
  • Page 129 CLUTCH KiSC issued 06, 2012 A...
  • Page 130 MECHANISM CONTENTS 1. LINKAGE MECHANISM ......................2-M1 KiSC issued 06, 2012 A...
  • Page 131 B2420, WSM CLUTCH 1. LINKAGE MECHANISM (1) Engine Flywheel (4) Pressure Plate (7) Clutch Rod (10) Clutch Release Bearing (2) Clutch Disc (5) Diaphragm Spring (8) Clutch Pedal (11) Clutch Shaft (3) Clutch Cover (6) Clutch Release Fork (9) Clutch Release Hub...
  • Page 132 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-S5 (1) Separating Engine from Clutch Housing .................2-S5 [3] DISASSEMBLING AND ASSEMBLING ................2-S12 [4] SERVICING .........................2-S13 KiSC issued 06, 2012 A...

  • Page 133: Troubleshooting

    B2420, WSM CLUTCH 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-S12 facing Release fork broken Replace 2-S12 Clutch disc or pressure plate warped...

  • Page 134: Servicing Specifications

    B2420, WSM CLUTCH 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Clutch Pedal Free travel on 20 to 30 mm – Clutch Pedal 0.8 to 1.2 in. Distance "A" 5.5 to 6.0 mm – 0.22 to 0.24 in. Clutch Disc Boss to Gear Shaft Backlash –...

  • Page 135: Tightening Torques

    B2420, WSM CLUTCH 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts: See page G-10.) Item N·m kgf·m lbf·ft Steering wheel mounting nut 30 to 49 3.0 to 5.0...

  • Page 136: Checking, Disassembling And Servicing

    B2420, WSM CLUTCH 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING Checking Clutch Pedal Free Travel CAUTION • When checking, park the tractor on flat ground, apply the parking brake, stop the engine and remove the key. 1. Slightly depress the clutch pedal (1) and measure free travel at top of pedal stroke "L".

  • Page 137: Preparation

    B2420, WSM CLUTCH [2] PREPARATION (1) Separating Engine from Clutch Housing Mid Mounting ROPS [If Equipped] • See page 1-S19. 9Y1210436CLS0005US0 Bonnet, Front Grille, Side Cover and Battery Negative Cable 1. Open the bonnet (2) and remove the front grille (1).
  • Page 138 B2420, WSM CLUTCH 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 139 B2420, WSM CLUTCH 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 140 B2420, WSM CLUTCH 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 plugs (1). (When refilling) • Fill new oil from filling port after removing the filling plug (2) up to the upper notch on the dipstick (3).
  • Page 141 B2420, WSM CLUTCH Meter Panel and Panel Under Cover 1. Tap out the spring pin (2) and remove the hand accelerator lever (1). 2. Open the meter panel (3) and disconnect the hourmeter cable, meter panel connector (6), combination switch connector (4) and hazard switch connector (7).
  • Page 142 B2420, WSM CLUTCH Fuel Tank 1. Disconnect the fuel hose (2) at the fuel filter side, then drain fuel completely. 2. Disconnect the wire harness clamps (1). 3. Remove the fuel tank frame stay (4). Disconnect the overflow hoses (3) and pull out the hour meter cable (5).
  • Page 143 B2420, WSM CLUTCH Hydraulic Pipes and Drag Link 1. Remove the accelerator rod (2). 2. Remove the power steering delivery pipe (1). 3. Disconnect the pipe clamp and disconnect the 3-point hitch delivery pipe (3). 4. Disconnect the suction hose (4).

  • Page 144: Disassembling And Assembling

    B2420, WSM CLUTCH Separating the Engine from the Clutch Housing 1. Place the disassembling jack under the engine and center frame. 2. Remove the engine mounting screws and nut, then separate the engine from the clutch housing with starter motor.

  • Page 145: Servicing

    B2420, WSM CLUTCH [4] 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 146 TRANSMISSION KiSC issued 06, 2012 A...
  • Page 147 MECHANISM CONTENTS 1. STRUCTURE..........................3-M1 2. POWER TRAIN FOR TRAVELLING SYSTEM................3-M2 [1] MAIN GEAR SHIFT SECTION ..................... 3-M2 [2] HI-MID-LO GEAR SHIFT SECTION..................3-M3 [3] FRONT WHEEL DRIVE SECTION ..................3-M3 3. POWER TRAIN FOR PTO GEAR ....................3-M4 [1] PTO SHIFT SECTION ......................

  • Page 148: Structure

    B2420, WSM TRANSMISSION 1. STRUCTURE (1) Clutch Housing Section (3) Lo-Mid-Hi Gear Shift Section (4) Differential Gear Section (5) One-way Clutch Section (Rear PTO) (6) PTO Shift Section (7) Front Wheel Drive Section (2) Main Gear Section 3-M1 KiSC issued 06, 2012 A...

  • Page 149: Power Train For Travelling System

    B2420, WSM TRANSMISSION 2. POWER TRAIN FOR TRAVELLING SYSTEM [1] MAIN GEAR SHIFT SECTION 1: 1st Speed 2nd Gear Shaft (5) →15T Gear (4) → 28T Gear (2) → Spline Boss → 4th Gear Shaft (1) 2: 2nd Speed 2nd Gear Shaft (5) → 13T Gear (4) → 17T Gear (6) →...

  • Page 150: Hi-Mid-Lo Gear Shift Section

    B2420, WSM TRANSMISSION [2] HI-MID-LO GEAR SHIFT SECTION L: Low Range 4th Gear Shaft (1) → 10T Gear (1) → 34T Gear (3) → Spline Boss → Spiral Bevel Pinion Shaft (2) M: Mid Range 4th Gear Shaft (1) → 21T Gear (1) → 22T Gear (3) →...

  • Page 151: Power Train For Pto Gear

    B2420, WSM TRANSMISSION 3. POWER TRAIN FOR PTO GEAR [1] PTO SHIFT SECTION (1) 2nd Gear Shaft with (3) PTO Shaft (5) 13T Gear (7) 3rd Shaft 15T-13T-18T Gear (4) One-way Clutch (6) 17T Gear (8) 24T Gear (2) 5th Gear Shaft with 11T Gear Low Range 2nd Gear Shaft →...

  • Page 152: Shifting Linkage

    B2420, WSM TRANSMISSION 4. SHIFTING LINKAGE (1) Main Gear Shift Lever Shaft (3) Main Gear Shift Fork (5) PTO Gear Shift Lever (7) PTO Gear Shift Fork (2) Safety Switch for Main Gear (4) Hi-Mid-Lo Gear Shift Lever (6) Hi-Mid-Lo Gear Shift Fork...
  • Page 153 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 Clutch Housing....................3-S4 (2) Separating Center Frame and Transmission Assembly ..........3-S10 [2] DISASSEMBLING AND ASSEMBLING ................3-S14 (1) Disassembling Clutch Housing..................3-S14 (2) Disassembling Transmission Case ................3-S15 (3) Disassembling Differential Gear Case................3-S18 [3] SERVICING .........................3-S20...

  • Page 154: Troubleshooting

    B2420, WSM TRANSMISSION 1. TROUBLESHOOTING CLUTCH HOUSING Reference Symptom Probable Cause Solution Page Noise from Clutch Transmission oil insufficient Refill G-26 Housing Gear worn or broken Replace – Bearing worn Replace 3-S20 TRANSMISSION CASE SECTION Reference Symptom Probable Cause Solution...

  • Page 155: Servicing Specifications

    B2420, WSM TRANSMISSION 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Shift Fork to Shift Gear Groove Clearance 0.03 to 0.4 mm 0.5 mm 0.002 to 0.1 in 0.02 in. Differential Case to Differential Side Gear Clearance 0.025 to 0.066 mm 0.30 mm...

  • Page 156: Tightening Torques

    B2420, WSM TRANSMISSION 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts: See page G-10.) Item N·m kgf·m lbf·ft Steering wheel mounting nut 30 to 49 3.0 to 5.0...

  • Page 157: Disassembling And Servicing

    B2420, WSM TRANSMISSION 4. DISASSEMBLING AND SERVICING [1] PREPARATION (1) Separating Clutch Housing Mid Mounting ROPS [If Equipped] • See page 1-S19. 9Y1210436CLS0005US0 Draining Transmission Fluid 1. Place an oil pan underneath the transmission case, and remove the drain plugs (1).
  • Page 158 B2420, WSM TRANSMISSION Bonnet, Front Grille, Side Cover and Battery Negative Cable 1. Open the bonnet (2) and remove the front grille (1). 2. Disconnect the battery negative cable (4). 3. Disconnect the head light connectors, horn connectors and remove the bonnet (2).
  • Page 159 B2420, WSM TRANSMISSION Meter Panel and Panel Under Cover 1. Tap out the spring pin (2) and remove the hand accelerator lever (1). 2. Open the meter panel (3) and disconnect the hourmeter cable, meter panel connector (6), combination switch connector (4) and hazard switch connector (7).
  • Page 160 B2420, WSM TRANSMISSION Fuel Tank 1. Disconnect the fuel hose (2) at the fuel filter side, then drain fuel completely. 2. Disconnect the wire harness clamps (1). 3. Remove the fuel tank frame stay (4). Disconnect the overflow hoses (3) and pull out the hour meter cable (5).
  • Page 161 B2420, WSM TRANSMISSION Hydraulic Pipes and Drag Link 1. Remove the accelerator rod (2). 2. Remove the power steering delivery pipe (1). 3. Disconnect the pipe clamp and disconnect the 3-point hitch delivery pipe (3). 4. Disconnect the suction hose (4).
  • Page 162 B2420, WSM TRANSMISSION Universal Joint 1. Loosen the clamp (2) and slide the universal joint cover (1) to the rear. 2. Tap out the spring pins (3). 3. Disconnect the bearing holder (4) and then slide the universal joint to the rear.

  • Page 163: Separating Center Frame And Transmission Assembly

    B2420, WSM TRANSMISSION Separating Clutch Housing from Center Frame 1. Remove the cotter pin (1) and then remove the clutch rod (2). 2. Place the disassembling stand under the clutch housing (3). 3. Remove propeller shaft (4). (When reassembling) 63 to 72 N·m...
  • Page 164 B2420, WSM TRANSMISSION ROPS and 3-point Hitch 1. Remove the upper frame mounting bolts and nuts, then remove the upper frame (1). 2. Disconnect the wire harness and remove the tail lamps (4). 3. Remove the license plate (3). 4. Remove the fender stay.
  • Page 165 B2420, WSM TRANSMISSION Steering Wheel, Meter Panel, Panel Under Cover and Step 1. Remove the steering wheel cap. 2. Remove the steering wheel mounting nut and remove the steering wheel (2) with a steering wheel pillar (Code No. 07916-51090). 3. Tap out the spring pin (6) and remove the hand accelerator lever (1).
  • Page 166 B2420, WSM TRANSMISSION Separating Transmission Assembly 1. Top out spring pins (2) and disconnect the universal joint (1) of front wheel drive propeller shaft. 2. Separate the transmission assembly from center frame. (When reassembling) • When inserting the spring pins (2), face their splits in the direction parallel the universal joint as shown in the figure below.

  • Page 167: Disassembling And Assembling

    B2420, WSM TRANSMISSION [2] DISASSEMBLING AND ASSEMBLING (1) Disassembling Clutch Housing Clutch Rod and Clutch Release Fork 1. Remove the external snap ring (1) at the end of clutch rod. 2. Draw out the clutch rod (3) and remove the clutch release fork (2).

  • Page 168: Disassembling Transmission Case

    B2420, WSM TRANSMISSION (2) Disassembling Transmission Case Separating Hydraulic Cylinder Case, Rear Axle, Main Gear Shift Cover and Others 1. Remove the hydraulic oil filter (3). 2. Remove the external snap ring and then remove the PTO shift lever (6) with rod and range gear shift lever (7).
  • Page 169 B2420, WSM TRANSMISSION 2nd Gear Shaft and Middle Shaft 1. Remove the bearing (1), 28T shift gear (2) and 17T-13T shift gear (3). 2. Remove the 23T-16T shift gear (6) with bearing (5). 3. Remove the 2nd gear shaft (4) with bearings.
  • Page 170 B2420, WSM TRANSMISSION 4th Gear Shaft and Spiral Bevel Pinion Shaft 1. Draw out the spiral bevel pinion shaft (2) with 13T-22T-34T shift gear (3), 13Tgear (7) and shift fork (4) with shift rod (5). 2. Draw out the 4th gear shaft (1) rearward.

  • Page 171: Disassembling Differential Gear Case

    B2420, WSM TRANSMISSION Main Gear Shift Fork 1. Remove the cotter pin (3), the spring (4) and ball (5). 2. Draw out the shift rod (6) and remove the 1st-reverse gear shift fork (7). 3. When remove the 2nd-3rd gear shift fork (1), in the same way as the 1st-reverse shift fork removing procedure.
  • Page 172 B2420, WSM TRANSMISSION Differential Bearing Holder 1. Remove the differential bearing holder mounting screws (1). 2. Remove the differential bearing holder (2) and shims (3), (4). (Reference) • Thickness of adjusting shim (3), (4) 0.2 mm (0.008 in.) shim. [Code No. 66611-15150] 0.5 mm (0.020 in.) shim.

  • Page 173: Servicing

    B2420, WSM TRANSMISSION 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 (Three Bond 1324B or its equivalent) to the spiral bevel gear UBS screws.

  • Page 174: Transmission Case

    B2420, WSM TRANSMISSION (2) Transmission Case Checking Bearing 1. Hold the inner race, and push and pull the outer race in all directions to check for wear and roughness. 2. Apply transmission fluid to the bearing, and hold the inner race.

  • Page 175: Differential Gear

    B2420, WSM TRANSMISSION (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 176 B2420, WSM TRANSMISSION 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 177: Rear Axle

    REAR AXLE KiSC issued 06, 2012 A...
  • Page 178 MECHANISM CONTENTS 1. STRUCTURE..........................4-M1 KiSC issued 06, 2012 A...
  • Page 179 B2420, WSM REAR AXLE 1. STRUCTURE (1) 10T Differential Gear Shaft (Brake Shaft) (2) 57T 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] PREPARATION ........................4-S3 (1) Separating Rear Axle Case .....................4-S3 [2] DISASSEMBLING AND SERVICING ..................4-S5 (1) Disassembling Rear Axle Case ..................4-S5 [3] SERVICING ...........................4-S5 KiSC issued 06, 2012 A...

  • Page 181: Troubleshooting

    B2420, WSM REAR AXLE 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

    B2420, WSM REAR AXLE 2. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts: See page G-10.) Item N·m kgf·m lbf·ft Rear wheel mounting nut 123 to 147 12.5 to 15.0...

  • Page 183: Disassembling And Servicing

    B2420, WSM REAR AXLE 3. DISASSEMBLING AND SERVICING [1] PREPARATION (1) 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 plugs (1).
  • Page 184 B2420, WSM REAR AXLE Battery Negative Cable 1. Open the bonnet (1) and remove the front grille. 2. Disconnect the battery negative cable (2). NOTE • When disconnecting the battery cables, disconnect the negative cable (2) first. When connecting, the positive cable first.

  • Page 185: Disassembling Rear Axle Case

    B2420, WSM REAR AXLE [2] DISASSEMBLING AND SERVICING (1) Disassembling Rear Axle Case Differential Lock Shift Fork, Differential Lock Clutch (Right Side Only), 57T Gear and Rear Axle 1. Remove the spring (1). 2. Draw out the differential lock shift fork (2) and differential lock clutch (3).
  • Page 186 BRAKES KiSC issued 06, 2012 A...
  • Page 187 MECHANISM CONTENTS 1. BRAKE LINKAGE ........................5-M1 2. OPERATION..........................5-M2 KiSC issued 06, 2012 A...
  • Page 188 B2420, WSM BRAKES 1. BRAKE LINKAGE (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. They are operated by the brake pedals through the mechanical linkages and provide stable braking and require little adjustment.
  • Page 189 B2420, WSM BRAKES 2. OPERATION (1) Cam Plate (4) Rear Axle Case (6) Brake Shaft (Differential Gear (7) Brake Cam (2) Friction Plate (5) Steel Ball Shaft) (8) Brake Cam Lever (3) Brake Disc 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 190 SERVICING CONTENTS 1. TROUBLESHOOTING.........................5-S1 2. SERVICING SPECIFICATIONS ....................5-S2 3. TIGHTENING TORQUES......................5-S3 4. CHECKING, DISASSEMBLING AND SERVICING ..............5-S4 [1] CHECKING AND ADJUSTING....................5-S4 [2] DISASSEMBLING AND ASSEMBLING ................5-S5 (1) Brake Pedal ........................5-S5 (2) Separating Rear Axle Case .....................5-S6 (3) Disassembling Rear Axle Case ..................5-S8 [3] SERVICING ...........................5-S9 KiSC issued 06, 2012 A...

  • Page 191: Troubleshooting

    B2420, WSM BRAKES 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-S8 Cam plate warped Replace 5-S9 Brake Drags Brake pedal free travel too small...

  • Page 192: Servicing Specifications

    B2420, WSM BRAKES 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Brake Pedal Free Travel 30 to 40 mm – 1.2 to 1.5 in. Pedal Shaft to Center Frame Clearance 0 to 0.165 mm 1.0 mm 0 to 0.00649 in.

  • Page 193: Tightening Torques

    B2420, WSM BRAKES 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts: See page G-10.) Item N·m kgf·m lbf·ft Rear wheel mounting nut 123 to 147 12.5 to 15.0...

  • Page 194: Checking, Disassembling And Servicing

    B2420, WSM BRAKES 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING Adjusting Brake Pedal Free Travel CAUTION • Stop the engine and chock the wheels before checking brake pedal. • The difference between the right and left pedal free travel must be less than 5 mm (0.2 in.).

  • Page 195: Disassembling And Assembling

    B2420, WSM BRAKES [2] DISASSEMBLING AND ASSEMBLING (1) Brake Pedal (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 196: Separating Rear Axle Case

    B2420, WSM BRAKES (2) 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 plugs (1). (When refilling) • Fill new oil from filling port after removing the filling plug (2) up to the upper notch on the dipstick (3).
  • Page 197 B2420, WSM BRAKES Battery Negative Cable 1. Open the bonnet (1) and remove the front grille. 2. Disconnect the battery negative cable (2). NOTE • When disconnecting the battery cables, disconnect the negative cable (2) first. When connecting, the positive cable first.

  • Page 198: Disassembling Rear Axle Case

    B2420, WSM BRAKES (3) Disassembling Rear Axle Case Differential Lock Shift Fork, Differential Lock Clutch (Right Side Only), 57T Gear and Rear Axle 1. Remove the spring (1). 2. Draw out the differential lock shift fork (2) and differential lock clutch (3).

  • Page 199: Servicing

    B2420, WSM BRAKES [3] SERVICING Clearance between Brake Pedal Shaft and Center Frame Bush 1. Measure the brake pedal shaft O.D. with an outside micrometer. 2. Measure the bush (3) I.D. with a cylinder gauge. 3. If the clearance exceeds the allowable limit, replace it.
  • Page 200 B2420, WSM BRAKES Brake Disc and Friction Plate Wear 1. Measure the brake disc thickness and the friction plate thickness with an outside micrometer. 2. If the thickness is less than the allowable limit, replace it. 3.30 to 3.50 mm Factory specification 0.130 to 0.137 in.

  • Page 201: Front Axle

    FRONT AXLE KiSC issued 06, 2012 A...
  • Page 202 MECHANISM CONTENTS 1. STRUCTURE..........................6-M1 KiSC issued 06, 2012 A...
  • Page 203 B2420, WSM FRONT AXLE 1. STRUCTURE (1) Axle (7) Differential Yoke Shaft, LH (13) Front Axle Bracket, Front (18) Spiral Bevel Pinion Shaft (2) Axle Flange (8) Front Axle Case (14) Differential Yoke Shaft, RH (19) Differential Side Gear (3) Bevel Gear...
  • Page 204 SERVICING CONTENTS 1. TROUBLESHOOTING.........................6-S1 2. SERVICING SPECIFICATIONS ....................6-S2 3. TIGHTENING TORQUES......................6-S3 4. CHECKING, DISASSEMBLING AND SERVICING ..............6-S4 [1] CHECKING AND ADJUSTING....................6-S4 [2] DISASSEMBLING AND ASSEMBLING ................6-S5 (1) Separating Front Axle......................6-S5 (2) Disassembling Front Axle....................6-S6 [3] SERVICING .........................6-S11 KiSC issued 06, 2012 A...

  • Page 205: Troubleshooting

    B2420, WSM FRONT AXLE 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Front Wheels Wander Tire pressure uneven Adjust G-46 to Right or Left Improper toe-in adjustment Adjust 6-S4 Clearance between front axle case boss and Replace 6-S13 front axle bracket bushing (front, rear) excessive...

  • Page 206: Servicing Specifications

    B2420, WSM FRONT AXLE 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Front Wheel Alignment Toe-in 0 to 20 mm – 0 to 0.78 in. Front Axle Rocking Force 50.0 to 100 N – 5.10 to 10.1 kgf 11.3 to 22.4 lbf...

  • Page 207: Tightening Torques

    B2420, WSM FRONT AXLE 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts: See page G-10.) Item N·m kgf·m lbf·ft Front wheel mounting nut 80.0 to 110 8.20 to 11.2...

  • Page 208: Checking, Disassembling And Servicing

    B2420, WSM FRONT AXLE 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING Measuring Toe-in 1. Park the tractor on the flat place. 2. Inflate the tires to the specified pressure. 3. Turn steering wheel so front wheels are in the straight ahead position.

  • Page 209: Disassembling And Assembling

    B2420, WSM FRONT AXLE [2] DISASSEMBLING AND ASSEMBLING (1) Separating Front Axle Draining Front Axle Case Oil 1. Place the oil pans underneath the front axle case. 2. Remove the both right and left hand side drain plugs (2) and filling plug (1) to drain the oil.

  • Page 210: Disassembling Front Axle

    B2420, WSM FRONT AXLE Front Axle Assembly 1. Remove the front axle brackets (Front side and rear side) mounting screws. 2. Separating the front axle from the front axle frame. (When reassembling) • After mounting the front axle assembly to the front axle frame, be sure to adjust the front axle rocking force.
  • Page 211 B2420, WSM FRONT AXLE Bevel Gear Case and Front Gear Case 1. Remove the bevel gear case mounting screws. 2. Remove the bevel gear case (1) and front gear case (4) as a unit from the front axle case (3).
  • Page 212 B2420, WSM FRONT AXLE 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 213 B2420, WSM FRONT AXLE Bevel Gear Case Gear 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 214 B2420, WSM FRONT AXLE 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 215: Servicing

    B2420, WSM FRONT AXLE [3] SERVICING Turning Torque of Spiral Bevel Pinion Shaft 1. Clamp the spiral bevel pinion shaft assembly to the vise and tighten the staking nut. 2. Measure the turning torque of bevel pinion shaft. 3. If the turning torque is not within the factory specifications, adjust with the lock nut.
  • Page 216 B2420, WSM FRONT AXLE Turning Torque of Spiral Bevel Pinion Shaft (Pinion Shaft Only) 1. Install the spiral bevel pinion shaft assembly only to the front axle case. 2. Measure the turning torque of spiral bevel pinion shaft. 3. If the turning torque is not within the factory specifications, adjust with the lock nut.
  • Page 217 B2420, WSM FRONT AXLE Clearance between Front Axle Case Bosses and Bracket Bushing 1. Measure the front axle case bosses O.D. with an outside micrometer. 2. Measure the bracket bushing I.D. with a cylinder gauge, and calculate the clearance. 3. If the clearance exceeds the allowable limit replace the bracket bushing.
  • Page 218 STEERING KiSC issued 06, 2012 A...
  • Page 219 MECHANISM CONTENTS 1. STRUCTURE..........................7-M1 [1] STEERING LINKAGE (INTEGRAL TYPE) ................7-M1 [2] POWER STEERING (INTEGRAL TYPE) ................7-M2 (1) Hydraulic Circuit ......................7-M2 (2) Power Steering Body...................... 7-M3 (3) Oil Flow........................... 7-M4 [3] INTEGRAL TYPE ......................... 7-M8 (1) Structure ......................... 7-M8 (2) Operation........................

  • Page 220: Structure

    B2420, WSM STEERING 1. STRUCTURE [1] STEERING LINKAGE (INTEGRAL TYPE) This type is Integral type. This type consists of six parts, steering wheel (5), knuckle arm (2), pitman arm (4), drag link (6), knuckle arm (2) and tie rod (1).

  • Page 221: Power Steering (Integral Type)

    (A) Return to Transmission Case B2420 is equipped with integral type power steering that consists of rotary type control valve with torsion bar. The oil sent from hydraulic pump (10) flows in gear case through control valve (6) and moves rack (4).

  • Page 222: Power Steering Body

    B2420, WSM STEERING (2) Power Steering Body (1) Sector Gear Shaft (6) Seal Ring (11) Torsion Bar (15) Sleeve (2) Rack (Piston) (7) Plug (12) Stub Shaft (Spool) (16) Bearing (3) Worm Shaft (8) Pin (13) Staking Ring (17) Oil Seal...

  • Page 223: Oil Flow

    B2420, WSM STEERING (3) Oil Flow Neutral Position (1) Sector Gear Shaft (2) Rack (Piston) (3) Worm Shaft (4) Torsion Bar (5) Sleeve (6) Valve Housing (7) Stub Shaft (A) From Pump (B) Return to Suction Line Pump Port Return Port...
  • Page 224 B2420, WSM STEERING Left Turning (1) Sector Gear Shaft (2) Rack (Piston) (3) Worm Shaft (4) Torsion Bar (5) Sleeve (6) Valve Housing (7) Stub Shaft (Spool) (8) Relief Valve (A) From Pump (B) Return to Suction Line Chamber "l"...
  • Page 225 B2420, WSM STEERING Right Turning (1) Sector Gear Shaft (2) Rack (Piston) (3) Worm Shaft (4) Torsion Bar (5) Sleeve (6) Valve Housing (7) Stub Shaft (Spool) (8) Relief Valve (A) From Pump (B) Return to Suction Line Chamber "l"...
  • Page 226 B2420, WSM STEERING Operation of Relief Valve This power steering is equipped with a direct-acting relief valve to restrict the maximum pressure in the hydraulic circuit and to prevent breakage of the hydraulic equipment. When the pressure in the hydraulic circuit exceeds...

  • Page 227: Integral Type

    B2420, WSM STEERING [3] INTEGRAL TYPE (1) Structure (1) Input Shaft (3) Sleeve (5) Main Shaft (7) Gear Box (2) Torsion Bar (4) Ball Nut (6) Sector Shaft (8) Adjust Screw This integral power steering mechanism consists of the following two major components as shown above: hydraulic control valve and steering force assist hydraulic cylinder.

  • Page 228: Operation

    B2420, WSM STEERING (2) Operation Neutral Position While the steering wheel is not moved, the torsion bar (2) is not twisted. There is no gap between the input shaft (1) and sleeve (3). This makes no pressure difference between the chambers "a" and "b" of the cylinder, which keeps the ball nut (4) and sector shaft (6) in their positions.
  • Page 229 SERVICING CONTENTS 1. TROUBLESHOOTING.........................7-S1 2. SERVICING SPECIFICATIONS ....................7-S2 3. TIGHTENING TORQUES......................7-S4 4. CHECKING, DISASSEMBLING AND SERVICING ..............7-S5 [1] CHECKING AND ADJUSTING....................7-S5 (1) Power Steering System ....................7-S5 (2) Hydraulic Pump for Power Steering ................7-S7 [2] PREPARATION ........................7-S8 (1) Hydraulic Pump for Power Steering ................7-S8 (2) Separating Power Steering Controller Assembly ............7-S9 [3] DISASSEMBLING AND ASSEMBLING ................7-S12 (1) Hydraulic Pump for Power Steering ................7-S12...
  • Page 230 B2420, WSM STEERING 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Excessive Steering Backlash between sector gear shaft and rack Adjust 7-S16 Wheel Play (piston) too large Steering linkage worn Replace – Sector gear shaft worn Replace 7-S13 Tractor Pulls to Right...

  • Page 231: Servicing Specifications

    B2420, WSM STEERING 2. SERVICING SPECIFICATIONS HYDRAULIC PUMP FOR POWER STEERING Item Factory Specification Allowable Limit Pump Delivery at no pressure Above – 9.8 L/min. 2.6 U.S.gals/min. 2.2 lmp.gals/min. Gear to Casing Clearance – 0.15 mm 0.0059 in. Gear Shaft to Bushing Clearance 0.020 to 0.091 mm...
  • Page 232 B2420, WSM STEERING POWER STEERING Item Factory Specification Allowable Limit Steering Wheel Operation Torque Less than – Condition 5 N·m • Engine Speed 0.5 kgf·m Approx. 2600 min (rpm) 4 lbf·ft • Oil Temperature 45 to 55 °C (113 to 131 °F) Play 5.0 to 30 mm...
  • Page 233 B2420, WSM STEERING 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts: See page G-10.) Item N·m kgf·m lbf·ft Drag link and slotted nut 18 to 35 1.9 to 3.5...

  • Page 234: Checking, Disassembling And Servicing

    B2420, WSM STEERING 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING (1) Power Steering System 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 235 B2420, WSM STEERING Relief Valve Setting Pressure 1. Open the bonnet and remove the front grille. 2. Disconnect the battery negative cable. 3. Remove the steering wheel (2) and then remove the meter panel (1) and panel under cover. 4. Remove the plug (3) of power steering gear box and then set the relief valve pressure tester (use adaptor D).

  • Page 236: Hydraulic Pump For Power Steering

    B2420, WSM STEERING (2) Hydraulic Pump for Power Steering Flowmeter Connecting and Test Preparation NOTE • 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 237: Preparation

    B2420, WSM STEERING Pump Test NOTE • Before pump testing, perform the flowmeter connecting and test preparation. 1. Open the loading valve completely. 2. Start the engine and set at approx. 2600 min (rpm). 3. Read and note the pump delivery at no pressure.

  • Page 238: Separating Power Steering Controller Assembly

    B2420, WSM STEERING (2) Separating Power Steering Controller Assembly Bonnet, Front Grille, Side Cover and Battery Negative Cable 1. Open the bonnet (2) and remove the front grille (1). 2. Disconnect the battery negative cable (4). 3. Disconnect the head light connectors, horn connectors and remove the bonnet (2).
  • Page 239 B2420, WSM STEERING Meter Panel and Panel Under Cover 1. Tap out the spring pin (2) and remove the hand accelerator lever (1). 2. Open the meter panel (3) and disconnect the hourmeter cable, meter panel connector (6), combination switch connector (4) and hazard switch connector (7).
  • Page 240 B2420, WSM STEERING Fuel Tank 1. Disconnect the fuel hose (2) at the fuel filter side, then drain fuel completely. 2. Disconnect the wire harness clamps (1). 3. Remove the fuel tank frame stay (4). Disconnect the overflow hoses (3) and pull out the hour meter cable (5).

  • Page 241: Disassembling And Assembling

    B2420, WSM STEERING Power Steering Controller Assembly 1. Remove the parking brake lever rod (1). 2. Remove the power steering delivery pipe (4). 3. Disconnect the hose clamp and the return hose (3). 4. Remove the return pipe (2) with the return hose (3).

  • Page 242: Power Steering Controller Body

    B2420, WSM STEERING (2) Power Steering Controller Body 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 243 B2420, WSM STEERING 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 244: Servicing

    B2420, WSM STEERING [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 245 B2420, WSM STEERING Clearance between Valve Housing and Sleeve 1. Measure the valve housing I.D. with a cylinder gauge and the sleeve O.D. with an outside micrometer, and calculate this clearance. 2. If the clearance exceeds the allowable limit, replace the valve housing or sleeve assembly.

  • Page 246: Hydraulic System

    HYDRAULIC SYSTEM KiSC issued 06, 2012 A...
  • Page 247 MECHANISM CONTENTS 1. HYDRAULIC CIRCUIT ....................... 8-M1 2. OIL FLOW........................... 8-M2 3. HYDRAULIC PUMP........................8-M3 4. THREE POINT HYDRAULIC SYSTEM ..................8-M4 [1] FEEDBACK LINKAGE......................8-M4 [2] CONTROL VALVE ....................... 8-M5 [3] RELIEF VALVE ........................8-M7 [4] HYDRAULIC CYLINDER...................... 8-M8 5.

  • Page 248: Hydraulic Circuit

    (9) Hydraulic Block Type Outlet (10) Relief Valve (11) Hydraulic Cylinder Suction Oil Low Pressure Oil This hydraulic circuit of B2420 consists 11 parts. The above figure is hydraulic circuit. The below figure is the right viewing of hydraulic flow structure. 9Y1210436HYM0001US0 8-M1...

  • Page 249: Oil Flow

    B2420, WSM HYDRAULIC SYSTEM 2. OIL FLOW (1) Clutch Housing (3) Hydraulic Pump (for Power (5) Position Control Valve Low Pressure Oil (Front Transmission Case) Steering) (6) Oil Filter Free Oil (2) Power Steering Controller (4) Hydraulic Pump (for Main...

  • Page 250: Hydraulic Pump

    B2420, WSM HYDRAULIC SYSTEM 3. HYDRAULIC PUMP The hydraulic pump is composed of the casing (1), cover (5), side plate (4), and two spur gears (drive gear (3) and driven gear (2)) that are in mesh. Hydraulic pump is driven by the fuel camshaft.

  • Page 251: Three Point Hydraulic System

    B2420, WSM HYDRAULIC SYSTEM 4. THREE POINT HYDRAULIC SYSTEM [1] FEEDBACK LINKAGE (1) Hydraulic Control Lever (2) Feedback Rod (3) Interlocker (4) Feedback Pin (5) Lock Nut (6) Lift Arm (7) Control Valve (8) Control Lever Shaft (9) Control Lever Arm...
  • Page 252 B2420, WSM HYDRAULIC SYSTEM [2] CONTROL VALVE This implement control valve (quarter inching valve) is located under the hydraulic cylinder block. Neutral Oil forced into the control valve (1) through P port and returns to the transmission case through T1 port.
  • Page 253 B2420, WSM HYDRAULIC SYSTEM Down When the control lever is moved to "DOWN" position, the spool (2) is moved to the right. Oil in the hydraulic cylinder is forced out to the transmission case through the T2 port by the weight of the implement, causing the implement to lower.

  • Page 254: Relief Valve

    B2420, WSM HYDRAULIC SYSTEM [3] RELIEF VALVE The implement control system circuit has a relief valve to restrict the maximum pressure in the circuit. The relief valve is located in the control valve body. The relief valve is of the guide piston type with damping effect.

  • Page 255: Hydraulic Cylinder

    B2420, WSM HYDRAULIC SYSTEM [4] HYDRAULIC CYLINDER (1) Lowering Speed Adjusting Shaft (2) Lowering Speed Adjusting Valve (3) Hydraulic Cylinder (4) Hydraulic Arm (5) Lift Arm (6) Control Valve (7) Relief Valve (8) Hydraulic Rod (9) Back-up Ring (10) O-ring (11) Piston The main components of the hydraulic cylinder are shown in the figure above.

  • Page 256: Auxiliary Hydraulics

    B2420, WSM HYDRAULIC SYSTEM 5. AUXILIARY HYDRAULICS [1] HYDRAULIC BLOCK TYPE OUTLET The hydraulic block type outlet is located at the right hand side of the engine. This hydraulic block type outlet is provided to take power out from the tractor to operate the hydraulic cylinders on the implement, such as front end loader, front blade and so on.
  • Page 257 SERVICING CONTENTS 1. TROUBLESHOOTING.........................8-S1 2. SERVICING SPECIFICATIONS ....................8-S2 3. TIGHTENING TORQUES......................8-S3 4. CHECKING, DISASSEMBLING AND SERVICING ..............8-S4 [1] CHECKING AND ADJUSTING....................8-S4 (1) Hydraulic Pump for 3-point Hydraulic System ..............8-S4 (2) Relief Valve ........................8-S6 (3) Lift Arm ..........................8-S7 [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 B2420, WSM HYDRAULIC SYSTEM 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Implement Does Not Control valve broken Replace 8-S12 Rise (No Noise) Control valve improperly adjusted Adjust 8-S6 Control valve improperly assembled Repair 8-S13 Relief valve improperly assembled Replace...

  • Page 259: Servicing Specifications

    B2420, WSM HYDRAULIC SYSTEM 2. SERVICING SPECIFICATIONS HYDRAULIC PUMP FOR THREE POINT HYDRAULIC SYSTEM Item Factory Specification Allowable Limit Pump Delivery At no pressure 17.9 L/min. – 4.73 U.S.gals/min. 3.94 lmp.gals/min. Gear to Casing Clearance – 0.15 mm 0.059 in.
  • Page 260 B2420, WSM HYDRAULIC SYSTEM 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts: See page G-10.) Item N·m kgf·m lbf·ft Power Steering delivery pipe nut 65 to 75 6.7 to 7.6...

  • Page 261: Checking, Disassembling And Servicing

    B2420, WSM HYDRAULIC SYSTEM 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING (1) Hydraulic Pump for 3-point Hydraulic System Flowmeter Connection 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.
  • Page 262 B2420, WSM HYDRAULIC SYSTEM Pump Test NOTE • Before pump testing, perform the flowmeter connecting and test preparation. 1. Open the loading valve completely. 2. Start the engine and set at approx. 2600 min (rpm). 3. Read and note the pump delivery at no pressure.

  • Page 263: Relief Valve

    B2420, WSM HYDRAULIC SYSTEM (2) Relief Valve Relief Valve Setting Pressure 1. Remove the seat. 2. Remove the seat under cover. 3. Remove the plug (1) from the hydraulic cylinder. 4. Install the adaptor. Then connect the cable and the pressure gauge to the adaptor 58.

  • Page 264: Lift Arm

    B2420, WSM HYDRAULIC SYSTEM (3) Lift Arm Lift Arm Free Play 1. Set the hydraulic control lever 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.
  • Page 265 B2420, WSM HYDRAULIC SYSTEM Position Control Lever CAUTION • When checking, park the tractor on flat ground and fully engage the parking brake. 1. Attach the approx. 1960 N (200 kg, 441 lbs) weight (1) to the end of the lower links.

  • Page 266: Preparation

    B2420, WSM HYDRAULIC SYSTEM [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 B2420, WSM HYDRAULIC SYSTEM Seat, Top Link, Lever Guides and Seat Bracket 1. Remove the seat (1) and seat under cover. 2. Remove the top link (2) and disconnect the lift rods (3). 3. Remove the lever grips and lever guides (4).

  • Page 268: Disassembling And Assembling

    B2420, WSM HYDRAULIC SYSTEM Hydraulic Cylinder Assembly 1. Remove the top link bracket L.H.. 2. Remove the hydraulic cylinder assembly (1) with connecting plate (2). (When reassembling) • Apply liquid gasket (Three Bond 1206D or equivalent) to joint face of the differential case and the hydraulic cylinder.

  • Page 269: Hydraulic Cylinder

    B2420, WSM HYDRAULIC SYSTEM (2) 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 270: Hydraulic Control Valve

    B2420, WSM HYDRAULIC SYSTEM Lowering Speed Adjusting Valve 1. Remove the internal snap ring (1) and pull out the lowering speed adjusting valve with shaft (2). 2. Draw out the ball (5) and spring (6). (When reassembling) • Take care not to damage the O-rings.

  • Page 271: Hydraulic Cylinder

    B2420, WSM HYDRAULIC SYSTEM Side Plate Thickness 1. Measure the side plate thickness with an outside micrometer. 2. If the thickness is less than the allowable limit, replace it. 2.48 to 2.50 mm Factory specification 0.0977 to 0.0984 in. Side plate thickness 2.40 mm...

  • Page 272: Electrical System

    ELECTRICAL SYSTEM KiSC issued 06, 2012 A...
  • Page 273 MECHANISM CONTENTS 1. WIRING DIAGRAM........................9-M1 [1] WITHOUT OPC MODEL (SERIAL NUMBER BELOW 33597)..........9-M1 [2] WITH OPC MODEL (SERIAL NUMBER ABOVE 33598)............. 9-M2 2. STARTING SYSTEM........................9-M3 [1] WITHOUT OPC MODEL (SERIAL NUMBER BELOW 33597)..........9-M3 [2] WITH OPC MODEL (SERIAL NUMBER ABOVE 33598)............. 9-M4 (1) Engine Starting Conditions and Automatic Engine Stop ..........

  • Page 274: Wiring Diagram

    B2420, WSM ELECTRICAL SYSTEM 1. WIRING DIAGRAM [1] WITHOUT OPC MODEL (SERIAL NUMBER BELOW 33597) 9-M1 KiSC issued 06, 2012 A...
  • Page 275 B2420, WSM ELECTRICAL SYSTEM [2] WITH OPC MODEL (SERIAL NUMBER ABOVE 33598) 9-M2 KiSC issued 06, 2012 A...

  • Page 276: Starting System

    B2420, WSM ELECTRICAL SYSTEM 2. STARTING SYSTEM [1] WITHOUT OPC MODEL (SERIAL NUMBER BELOW 33597) (1) Starter Relay (5) Safety Switch (7) Frame Earth (10) Battery (2) Fuse (Rear PTO Switch) (8) Glow Plug (11) Starter Motor (3) Glow Plug Indicator...

  • Page 277: With Opc Model (Serial Number Above 33598)

    (5) Seat Switch 9Y1210436ELM0023US0 B2420 tractor is 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 278 (8) Main Gear Shift Lever Switch (12) Charge Lamp B2420 is configured with an "Operator Presence Control (OPC)" system to control engine starting automatically stopping. This OPC system mainly consists of controller and engine starting / stopping control switches such as the main gear shift switch, the seat switch, the rear PTO switch and the parking brake switch.
  • Page 279 B2420, WSM ELECTRICAL SYSTEM OPC Controller OPC controller (1) is located inside the panel board. A current from the main switch (5), safety switches and alternator L terminal flows to OPC controller (1). OPC controller (1) receives current as data,...

  • Page 280: Engine Starting Conditions And Automatic Engine Stop

    B2420, WSM ELECTRICAL SYSTEM (1) Engine Starting Conditions and Automatic Engine Stop When the following conditions become complete, electric current (12 V) reaches starter S terminal through operator presence controller main switch and the engine can be started. Engine Starting Conditions and Engine Auto-stop Conditions...

  • Page 281: Starter

    B2420, WSM ELECTRICAL SYSTEM [3] STARTER (1) Housing (2) Magnetic Switch (3) Overrunning Clutch (4) Drive Lever (5) Internal Gear (6) Gear Shaft (7) Planetary Gear (8) Armature Shaft (9) Yoke (10) Brush Holder (11) Rear End Frame The starter is a reduction type.

  • Page 282: Safety Switch

    B2420, WSM ELECTRICAL SYSTEM [4] SAFETY SWITCH Main Gear Shift Lever Switch and Rear PTO Switch (Serial Number Below 33597) Main gear shift lever switch and rear PTO switch are connected with the series on the start circuit. When both main gear shift lever and PTO gear shift lever are on neutral position, the engine can be started.
  • Page 283 B2420, WSM ELECTRICAL SYSTEM Main Gear Shift Lever Switch, Rear PTO Switch and Parking Brake Switch (Serial Number Above 33598) Main gear shift lever switch (1), rear PTO switch (2) and parking brake switch (3) are connected with OPC controller on the start circuit.

  • Page 284: Glow Plug

    B2420, WSM ELECTRICAL SYSTEM [5] GLOW PLUG This plug is a two-material type QGS (Quick Glow System) quick temperature rise, self-controlling function as well as excellent durability. The heater (4) connected in series to the heater (3), which also functions as the resistor, is incorporated in the sheath tube (1) of the super glow plug.

  • Page 285: Charging System

    B2420, WSM ELECTRICAL SYSTEM 3. CHARGING SYSTEM [1] WITHOUT OPC MODEL (1) Fuse (3) Main Switch (5) Battery (7) Alternator (2) Charging Lamp (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 286: With Opc Model

    B2420, WSM ELECTRICAL SYSTEM [2] WITH OPC MODEL (1) Relay (4) Main Switch (6) Slow Blow Fuse (8) Starter Motor (2) Fuse (5) Frame Earth (7) Battery (9) Alternator (3) Charging Lamp The charging system supplies electric power for various electrical devices and also charges the battery while the engine runs.

  • Page 287: Ic Regulator

    B2420, WSM ELECTRICAL SYSTEM [3] IC REGULATOR (1) Alternator (2) Rectifier (3) Stator Coil (4) Rotor Coil (5) IC Regulator (6) Charge Lamp (7) Main Switch (8) Battery (9) Load An IC regulator uses solid state transistors, chips or other semiconductor elements instead of the relays in a conventional regulator.

  • Page 288: Lighting System

    B2420, WSM ELECTRICAL SYSTEM 4. LIGHTING SYSTEM The lighting system consists of combination switch (lamp switch and hazard switch), head lamp, tail lamp, hazard lamp, etc.. 9Y1210436ELM0009US0 [1] HEAD LAMP The head light switch, which forms a combination switch with the turn signal lamp switch and horn switch, has three positions;...

  • Page 289: Turn Signal Lamp And Hazard Lamp

    B2420, WSM ELECTRICAL SYSTEM [2] TURN SIGNAL LAMP AND HAZARD LAMP Combination Switch Combination switch consist of head lamp switch, turn signal lamp switch and horn switch. [Head Lamp Switch] [Turn Signal Lamp Switch] [Horn Switch] (1) Head Lamp Switch...

  • Page 290: Without Opc Model

    B2420, WSM ELECTRICAL SYSTEM (1) Without OPC Model (1) Fuse (6) Turn Switch Relay (11) Slow Blow Fuse (15) Front Combination Lamp (2) Hazard Switch (7) Meter Panel (12) Battery (L.H.) (3) Flasher Unit (8) Combination Switch (13) Rear Combination Lamp...

  • Page 291: With Opc Model

    B2420, WSM ELECTRICAL SYSTEM (2) With OPC Model (1) Fuse (4) Meter Panel (6) Main Switch (8) Slow Blow Fuse (2) Hazard Switch (5) Combination Switch (7) Frame Earth (9) Battery (3) Flasher Unit Hazard switch has two positions; ON and OFF. Blinking the hazard lamp and indicator lamps as shown in the figure above.
  • Page 292 B2420, WSM ELECTRICAL SYSTEM Flasher Unit The function of flasher unit is as follows. 1. The flasher unit blinks the turn signal lamp (3), (4) and hazard indicator light (2) when the hazard switch (13) is turned on. 2. Then flasher unit blinks the turn signal lamp (3) or (4), when the turn signal switch (14) is turned clockwise or counterclockwise.

  • Page 293: Brake Lamp

    B2420, WSM ELECTRICAL SYSTEM [3] BRAKE LAMP The brake switch is turned on when stepping on the brake pedal, and the brake lamp is lighted up. 9Y1210436ELM0014US0 Brake Lamp Switch Brake lamp switch is turned on by pushing a brake pedal and turned off by releasing it.

  • Page 294: Easy Checker

    B2420, WSM ELECTRICAL SYSTEM 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. 9Y1210436ELM0016US0 (1) Oil Pressure Lamp When the engine oil pressure is low, this lamp illuminates.

  • Page 295: Gauges

    B2420, WSM ELECTRICAL SYSTEM 6. GAUGES [1] FUEL LEVEL SENSOR Fuel Level Sensor The remaining fuel quantity is detected by the fuel level sensor installed in the fuel tank and indicated on the fuel gauge. For detection, a float and a resistor are used.

  • Page 296: Trailer Socket

    B2420, WSM ELECTRICAL SYSTEM 7. TRAILER SOCKET The trailer socket is provided to take out the electrical power from tractor to trailer or implement. The function of each terminal is shown below. Terminal Function Color of wire harness Turn signal light (L.H.) Green / White –...
  • Page 297 SERVICING CONTENTS 1. TROUBLESHOOTING.........................9-S1 2. SERVICING SPECIFICATIONS ....................9-S5 3. CHECKING, DISASSEMBLING AND SERVICING ..............9-S6 [1] CHECKING AND ADJUSTING....................9-S6 (1) Battery ..........................9-S6 (2) Main Switch ........................9-S8 (3) Relay ..........................9-S11 (4) Glow Plug ........................9-S12 (5) Safety Switch (Main Gear Shift Lever, Rear PTO Switch, Parking Brake and Seat Switch)...........................9-S13 (6) OPC Controller ......................9-S15 (7) Key Stop Solenoid ......................9-S16...
  • Page 298 B2420, WSM ELECTRICAL SYSTEM 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page All Electrical Battery discharged or defective Repair or Replace G-20 Equipments Do Not 9-S7 Operate Battery positive cable disconnected or improperly Repair or Replace 9-S6 connected Battery negative cable disconnected or...
  • Page 299 B2420, WSM ELECTRICAL SYSTEM AUTOMATIC ENGINE STOP Reference Symptom Probable Cause Solution Page Engine Does Not Key stop solenoid fuse blown Replace 9-S16 Stop When Main Starter relay defective Replace 9-S11 Switch Is Turned OFF Key stop solenoid defective Replace...
  • Page 300 B2420, WSM ELECTRICAL SYSTEM LIGHTING SYSTEM Reference Symptom Probable Cause Solution Page Head light Does Not Fuse blown (25 A) Replace G-31 Light Bulb blown Replace G-32 Wiring harness disconnected or improperly Repair or Replace 9-M17 connected (between main switch AC terminal...
  • Page 301 B2420, WSM ELECTRICAL SYSTEM 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-15 Engine Is Running Oil pressure switch defective Replace 9-S26...

  • Page 302: Servicing Specifications

    B2420, WSM ELECTRICAL SYSTEM 2. SERVICING SPECIFICATIONS STARTER MOTOR 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 0.20 mm...

  • Page 303: Checking, Disassembling And Servicing

    B2420, WSM ELECTRICAL SYSTEM 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 304 B2420, WSM ELECTRICAL SYSTEM 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 305: Main Switch

    B2420, WSM ELECTRICAL SYSTEM (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 (2) Main Switch...
  • Page 306 B2420, WSM ELECTRICAL SYSTEM Main Switch Continuity 1) Main Switch Key at OFF Position 1. Set the main switch OFF position. 2. Measure the resistance with an ohmmeter across the B terminal and the AC terminal, B terminal and 50 terminal, B terminal and 19 terminal.
  • Page 307 B2420, WSM ELECTRICAL SYSTEM 4) Main Switch Key at START Position 1. Set and hold the main switch key at the START position. 2. Measure the resistance with an ohmmeter across the B terminal and the 19 terminal, across the B terminal an the 50 terminal, and across the B terminal and the AC terminal.

  • Page 308: Relay

    B2420, WSM ELECTRICAL SYSTEM (3) Relay Relay 1. Remove the panel board and starter relay (1). 2. Apply battery voltage across 2 terminal and 4 terminal, and check for continuity across 1 terminal and 3 terminal. 3. If 0 Ω is not indicated, renew the starter relay (1).

  • Page 309: Glow Plug

    B2420, WSM ELECTRICAL SYSTEM (4) 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 310: Safety Switch (Main Gear Shift Lever, Rear Pto Switch, Parking Brake And Seat Switch)

    B2420, WSM ELECTRICAL SYSTEM (5) Safety Switch (Main Gear Shift Lever, Rear PTO Switch, Parking Brake and Seat Switch) Main Gear Shift Switch 1. Disconnect the main gear shift switch connectors. 2. Connect the circuit tester leads to the main gear shift switch 2P connector.
  • Page 311 B2420, WSM ELECTRICAL SYSTEM Rear PTO Switch 1. Disconnect the 2P connector (2) from the rear PTO switch. 2. Connect the circuit tester leads to the rear PTO switch 2P connector (2). (When the PTO gear shift lever is in "NEUTRAL" position) 1.

  • Page 312: Opc Controller

    B2420, WSM ELECTRICAL SYSTEM Parking Brake Switch (Serial Number Above 33598) 1. Disconnect the parking brake switch connector (2). 2. Connect the circuit tester leads to the parking brake switch 2P connector. (When the parking brake switch is in "NEUTRAL" position) 1.

  • Page 313: Key Stop Solenoid

    B2420, WSM ELECTRICAL SYSTEM (7) Key Stop Solenoid Lead Terminal Voltage 1. Disconnect the connector of engine stop solenoid. 2. Turn the main switch "ON". 3. Measure the voltage with voltmeter across the terminal 1 and 2 (Red / Green and White) of the wiring harness side and the chassis.
  • Page 314 B2420, WSM ELECTRICAL SYSTEM Magnetic Switch Test 1. Disconnect the battery negative cable from the battery. 2. Disconnect the battery positive cable and the leads from the starter M terminal. 3. Remove the starter from the engine. 4. Disconnect the connecting lead (3) from the starter C terminal (2).

  • Page 315: Alternator

    B2420, WSM ELECTRICAL SYSTEM (9) Alternator 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 9Y1210436ELS0041US0 Connector Voltage 1. Turn the main switch OFF. Measure the voltage between the B terminal (1) and the chassis.

  • Page 316: Combination Switch

    B2420, WSM ELECTRICAL SYSTEM (10) Combination Switch 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). (1) Combination Switch...
  • Page 317 B2420, WSM ELECTRICAL SYSTEM 5) Turn Signal lamp Switch Continuity When Setting Switch Knob at L Position 1. Set the turn signal lamp switch to the L position. 2. Measure the resistance with an ohmmeter across the B2 terminal and L terminal.

  • Page 318: Flasher Relay, Turn Switch Relay And Beacon Light Relay

    B2420, WSM ELECTRICAL SYSTEM (11) Flasher Relay, Turn Switch Relay and Beacon Light Relay Flasher Relay, Turn Switch relay and Beacon Light Relay 1. Open the panel board and remove out the flasher relay. 2. Apply battery voltage across 2 terminal and 4, and check for continuity across 1 terminal and 3.

  • Page 319: Hazard Switch

    B2420, WSM ELECTRICAL SYSTEM (12) Hazard Switch 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. 4. Perform the following checks.

  • Page 320: Flasher Unit

    B2420, WSM ELECTRICAL SYSTEM (13) Flasher Unit Flasher Unit Connector Voltage (Serial Number below 35597) 1. Disconnect the connector (2) from the flasher unit (1) after disconnect the negative cord from the battery. 2. Connect the negative cord to the battery, and measure the voltage with a voltmeter across the connector 1 terminal and 3 terminal.
  • Page 321 B2420, WSM ELECTRICAL SYSTEM Flasher Unit (Serial Number Above 33598) 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. 4. If the voltage differ from the battery voltage, the wiring harness is faulty.

  • Page 322: Mater Panel

    B2420, WSM ELECTRICAL SYSTEM (14) Mater Panel Connector Voltage 1. Remove the panel board and disconnect the connector from it. 2. Turn the main switch ON. 3. Measure the voltage with a voltmeter across the terminal and the earth terminal.
  • Page 323 B2420, WSM ELECTRICAL SYSTEM Engine Oil Pressure Switch 1. Measure the resistance with an ohmmeter across the switch terminal and the chassis. 2. If 0 Ω is not indicated in the normal state, the switch is faulty. 3. If infinity is not indicated at pressure over 4.9 kPa (0.5 kgf/cm 7 psi), the switch is faulty.

  • Page 324: Gauges

    B2420, WSM ELECTRICAL SYSTEM (15) Gauges Fuel Gauge and Coolant Temperature Gauge Continuity 1. Remove the meter panel from the tractor. 2. Check the continuity with an ohmmeter across the U terminal (1) and IGN terminal (3) and across the U terminal (1) and GND terminal (2).

  • Page 325: Trailer Coupler

    B2420, WSM ELECTRICAL SYSTEM (16) Trailer Coupler Turn Signal Lamp Terminals 1. Turn the main switch ON, and measure the voltage with voltmeter across the 1 terminal (1) and 3 terminal (2), and across the 4 terminal (3) and 3 terminal (2).

  • Page 326: Brake Lamp

    B2420, WSM ELECTRICAL SYSTEM (17) Brake Lamp Brake Lamp Switch 1. Disconnect the leads, and measure the resistance with an ohmmeter across the brake lamp switch leads. 2. If the measurement differs from the table below, the brake lamp switch (1) faulty or need to adjust the brake lamp switch position.

  • Page 327: Disassembling And Assembling

    B2420, WSM ELECTRICAL SYSTEM [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 (12) Yoke...

  • Page 328: Alternator

    B2420, WSM ELECTRICAL SYSTEM (2) Alternator Pulley 1. Secure the hexagonal end of the pulley shaft with a double-ended ratchet wrench as shown in the figure, loosen the pulley nut with a socket wrench and remove it. (When reassembling) 58.4 to 78.9 N·m...
  • Page 329 B2420, WSM ELECTRICAL SYSTEM Rear End Frame 1. Unscrew the two nuts and two screws holding the drive end frame and the rear end frame. 2. Remove the rear end frame (1). (1) Rear End Frame 9Y1210436ELS0009US0 Rotor 1. Press out the rotor (1) from drive end frame (3).

  • Page 330: Servicing

    B2420, WSM ELECTRICAL SYSTEM [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 331: Alternator

    B2420, WSM ELECTRICAL SYSTEM Armature Coil 1. Check the continuity between the commutator and armature coil core with an ohmmeter. 2. If it conducts, replace the armature. 3. Check the continuity between the segments of the commutator with an ohmmeter.
  • Page 332 B2420, WSM ELECTRICAL SYSTEM Slip Ring 1. Check the slip ring for score. 2. If scored, correct with an emery paper or on a lathe. 3. Measure the O.D. of slip ring with vernier calipers. 4. If the measurement is less than the allowable limit, replace it.
  • Page 333 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 2012. 06, S, EI, EI, engusa Code No.9Y111-04362 2010.

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