Kubota L4400 Workshop Manual
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Kubota L4400 Workshop Manual

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Tractor Manuals Scotland
WORKSHOP MANUAL
TRACTOR
L4400
Tractor Manuals Scotland - Please Do Not Copy
KiSC issued 07, 2007 A

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Summary of Contents for Kubota L4400

  • Page 1 Tractor Manuals Scotland WORKSHOP MANUAL TRACTOR L4400 Tractor Manuals Scotland - Please Do Not Copy KiSC issued 07, 2007 A...
  • Page 2 Tractor Manuals Scotland TO THE READER This Workshop Manual has been prepared to provide servicing personnel with information on the mechanism, service and maintenance of L4400. It is divided into three parts, “General”, “Mechanism” and “Servicing” for each section. General Information on the tractor identification, the general precautions, maintenance check list, check and maintenance and special tools are described.
  • Page 3 Tractor Manuals Scotland L4400 , WSM SAFETY INSTRUCTIONS SAFETY INSTRUCTIONS 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 4 Tractor Manuals Scotland L4400 , WSM SAFETY INSTRUCTIONS SAFETY STARTING • Do not start the engine by shorting across starter terminals or bypassing the safety start switch. • Do not alter or remove any part of machine safety system. • Before starting the engine, make sure that all shift levers are in neutral positions or in disengaged positions.
  • Page 5 Tractor Manuals Scotland L4400 , WSM SAFETY INSTRUCTIONS AVOID FIRES • Fuel is extremely flammable and explosive under certain conditions. Do not smoke or allow flames or sparks in your working area. • To avoid sparks from an accidental short circuit, always disconnect the battery negative cable first and connect it last.
  • Page 6 Tractor Manuals Scotland L4400 , WSM SAFETY INSTRUCTIONS PREPARE FOR EMERGENCIES • Keep a first aid kit and fire extinguisher handy at all times. • Keep emergency numbers for doctors, ambulance service, hospital and fire department near your telephone. Tractor Manuals Scotland - Please Do Not Copy...
  • Page 7 Tractor Manuals Scotland L4400 , WSM SAFETY INSTRUCTIONS SAFETY DECALS The following safety decals 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 8 Tractor Manuals Scotland L4400 , WSM SAFETY INSTRUCTIONS Tractor Manuals Scotland - Please Do Not Copy KiSC issued 07, 2007 A...
  • Page 9 Tractor Manuals Scotland L4400 , WSM SAFETY INSTRUCTIONS Tractor Manuals Scotland - Please Do Not Copy KiSC issued 07, 2007 A...
  • Page 10 Tractor Manuals Scotland L4400 , WSM SPECIFICATIONS SPECIFICATIONS Model L4400 PTO power kW (HP) / rpm 28.0 (37.5) / 2600 Maker KUBOTA Model V2203-M-E2A Indirect injection, vertical, water-cooled 4 cycle diesel Type Number of cylinders Bore and stroke mm (in.) 87 X 92.4 (3.4 X 3.6)
  • Page 11 Tractor Manuals Scotland L4400 , WSM DIMENSIONS DIMENSIONS Tractor Manuals Scotland - Please Do Not Copy KiSC issued 07, 2007 A...
  • Page 12 Tractor Manuals Scotland GENERAL Tractor Manuals Scotland - Please Do Not Copy KiSC issued 07, 2007 A...

  • Page 13: Table Of Contents

    Tractor Manuals Scotland GENERAL CONTENTS 1. TRACTOR INDENTIFICATION............... G-1 2. GENERAL PRECAUTIONS ................G-2 3. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING .. G-3 [1] WIRING ..................... G-3 [2] BATTERY....................G-5 [3] FUSE......................G-5 [4] CONNECTOR .................... G-5 [5] HANDLING OF CIRCUIT TESTER............G-7 4.

  • Page 14: Tractor Indentification

    Tractor Manuals Scotland L4400 , WSM G GENERAL 1. TRACTOR INDENTIFICATION (1) Tractor Identification Plate (3) Engine Serial Number (2) Tractor Serial Number (4) Hour Meter W1010590 Tractor Manuals Scotland - Please Do Not Copy KiSC issued 07, 2007 A...

  • Page 15: General Precautions

    Screws, bolts and nuts should be installed in their original position to prevent reassembly errors. • When special tools are required, use KUBOTA genuine special tools. Special tools which are not frequently used should be made according to the drawings provided.

  • Page 16: Handling Precautions For Electrical Parts And Wiring

    Tractor Manuals Scotland L4400 , WSM G 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...
  • Page 17 Tractor Manuals Scotland L4400 , WSM G GENERAL • Securely clamp, being careful not to damage wiring. (1) Clamp (3) Clamp • Wind Clamp Spirally (4) Welding Dent (2) Wire Harness W10114580 • Clamp wiring so that there is no twist, unnecessary sag, or excessive tension, except for movable part, where sag be required.

  • Page 18: Battery

    Tractor Manuals Scotland L4400 , WSM G 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.
  • Page 19 Tractor Manuals Scotland L4400 , WSM G GENERAL • In separating connectors, do not pull wire harnesses. • Hold connector bodies to separate. (A) Correct (B) Incorrect W10122720 • Use sandpaper to remove rust from terminals. • Repair deformed terminal. Make certain there is no terminal...

  • Page 20: Handling Of Circuit Tester

    Tractor Manuals Scotland L4400 , WSM G GENERAL [5] HANDLING OF CIRCUIT TESTER • Use tester correctly following manual provided with tester. • Check for polarity and range. W10267220 Tractor Manuals Scotland - Please Do Not Copy KiSC issued 07, 2007 A...

  • Page 21: Lubricants, Fuel And Coolant

    10W-40 40 L Transmission case 10.6U.S.gals. KUBOTA UDT or SUPER UDT fluid* 8.8 Imp.gals. 6.5 L KUBOTA UDT or SUPER UDT fluid* or SAE80 Front axle case 6.9 U.S.qts. - 90 gear oil 1.4 Imp.qts. Greasing No. of greasing points...

  • Page 22: Tightening Torques

    Tractor Manuals Scotland L4400 , WSM G GENERAL 5. TIGHTENING TORQUES [1] GENERAL USE SCREWS, BOLTS AND NUTS Screws, bolt and nuts whose tightening torque are not specified in this Workshop Manual should be tightened according to the table below.

  • Page 23: Maintenance

    Tractor Manuals Scotland L4400 , WSM G GENERAL 6. MAINTENANCE Period Indication on hour meter Refer After -ence 100 150 200 250 300 350 400 450 500 550 600 650 700 since Item page every 1 Engine oil Change G-13...
  • Page 24 *4 : When the battery is used for less than 100 hours per year, check the battery condition by reading the indicator annually. • The items insted above (@ marked) are registered as emission related crirtical parts by KUBOTA in the U.S.EPA nonroad emission regulation.

  • Page 25: Check And Maintenance

    Tractor Manuals Scotland L4400 , WSM G 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. [1] DAILY CHECK To prevent trouble from occurring, it is important to know the condition of the tractor.

  • Page 26: Check Points Of Initial 50 Hours

    Tractor Manuals Scotland L4400 , WSM G GENERAL [2] CHECK POINTS OF INITIAL 50 HOURS Changing Engine Oil CAUTION • Before changing oil, be sure to stop the engine. 1. Start and warm up the engine for approx. 5 minutes.
  • Page 27 3. Drain the transmission fluid. 4. After draining, screw in the drain plugs (1). 5. Fill with the new KUBOTA SUPPER UDT fluid up to the upper line of the gauge (2). 6. After running the engine for a few minutes, stop it and check the fluid level again, if low, add fluid prescribed level (A).
  • Page 28 5. Fill with the new oil up to the check plug (2) port. 6. After filling, reinstall the check plug (2) and filling port plug. IMPORTANT • Use KUBOTA SUPER UDT fluid or SAE 80, 90 gear oil. Refer to “LUBRICANTS, FUEL AND COOLANT”. (See page G-8.) 6.5 L...

  • Page 29: Check Points Of Every 50 Hours

    Tractor Manuals Scotland L4400 , WSM G GENERAL Adjusting Clutch Pedal Free Travel 1. Slightly depress the clutch pedal (5) and measure free travel on top of clutch pedal. 2. If the measurement is not within the factory specifications, loosen the lock nut (2), remove the cotter pin (3) and the clevis pin (4), then adjust the length of rod (1) within acceptable limits.
  • Page 30 Tractor Manuals Scotland L4400 , WSM G GENERAL Greasing (Continued) 1. Apply a grease to the following position as figures. NOTE • Apply a small amount of multipurpose grease to the following points every 50 hours. If you operated the machine in extremely wet and muddy conditions, lubricate grease fittings more often.
  • Page 31 Tractor Manuals Scotland L4400 , WSM G GENERAL Checking Engine Start System with POC (Operator Presence Control System) CAUTION • Do not allow anyone near the tractor while testing. • If the tractor does not pass the test do not operate the tractor.

  • Page 32: Check Point Of Every 100 Hours

    Tractor Manuals Scotland L4400 , WSM G GENERAL Checking Wheel Mounting Screws and Nuts Tightening Torque CAUTION • Never operate tractor with a loose rim, wheel or axle. • Any time screws and nuts are loosened, retighten to specified torque.
  • Page 33 Tractor Manuals Scotland L4400 , WSM G GENERAL Cleaning Air Cleaner Element 1. Remove the air cleaner cover (3) and primary element (2). 2. Clean the primary element : • When dry dust adheres to the element, blow compressed air from the inside turning the element.
  • Page 34 Tractor Manuals Scotland L4400 , WSM G GENERAL Adjusting Fan Belt Tension CAUTION • Be sure to stop the engine before checking fan belt tension. 1. Stop the engine and remove the key. 2. Apply moderate thumb pressure to belt between pulleys.
  • Page 35 Tractor Manuals Scotland L4400 , WSM G GENERAL Adjusting Brake Pedal Free Travel CAUTION • Stop the engine and remove the key, then chock the wheel before checking brake pedals. 1. Release the parking brake. 2. Slightly depress the brake pedals and measure free travel (A) at top of pedal stroke.
  • Page 36 Tractor Manuals Scotland L4400 , WSM G GENERAL Checking Battery Condition CAUTION • Do not use or charge the refillable type battery if the fluid level is below the LOWER (lower limit level) mark. Otherwise, the battery component parts may prematurely deteriorate, which may shorten the battery's service life or cause an explosion.
  • Page 37 Tractor Manuals Scotland L4400 , WSM G GENERAL Battery Charging CAUTION • When the batteru is being acrivated, hydrogen and oxugen geses in the battery are extremely explosive. Keep open sparks and flames away feom the battery at all times, especially when charging the battery.

  • Page 38: Check Points Of Every 200 Hours

    Tractor Manuals Scotland L4400 , WSM G GENERAL [5] CHECK POINTS OF EVERY 200 HOURS Replacing Engine Oil Filter Cartridge 1. See page G-14. W1037936 Replacing Hydraulic Oil Filter 1. See page G-15. W1039694 Checking Radiator Hose and Hose Clamp Check to see if radiator hoses are properly fixed every 200 hours of operation or six months, whichever comes first.
  • Page 39 Tractor Manuals Scotland L4400 , WSM G GENERAL Checking Intake Air Line 1. Check to see that hoses and hose clamps are tight and not damaged. 2. If hoses and clamps are found worn or damaged, replace or repair them at once.
  • Page 40 Tractor Manuals Scotland L4400 , WSM G GENERAL 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. 4. Lower the implement, lock the parking brake and stop the engine.

  • Page 41: Check Points Of Every 400 Hours

    Tractor Manuals Scotland L4400 , WSM G GENERAL [6] CHECK POINTS OF EVERY 400 HOURS Changing Transmission Fluid 1. See page G-14. W1039932 Replacing Fuel Filter Element 1. See page G-20. W1039982 Changing Front Axle Case Oil [4WD] 1. See page G-15.

  • Page 42: Check Point Of Every 3000 Hours

    Tractor Manuals Scotland L4400 , WSM G GENERAL [10] CHECK POINT OF EVERY 3000 HOURS Checking Injection Pump 1. See page 1-S18. [11] CHECK POINT OF EVERY 1 YEAR Replacing Air Cleaner Element 1. See page G-20. W1040246 [12] CHECK POINTS OF EVERY 2 YEARS...
  • Page 43 Tractor Manuals Scotland L4400 , WSM G GENERAL Anti-Freeze CAUTION • When using antifreeze, put on some protection such as rubber gloves (Antifreeze contains poison.). • 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 Tractor Manuals Scotland L4400 , WSM G GENERAL 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 * At 1.013 x 1000000 Pa (760mmHg) pressure (atmospheric).

  • Page 45: Others

    Tractor Manuals Scotland L4400 , WSM G GENERAL Replacing Fuel Hose 1. Replace the fuel hoses and clamps. Refer to “Checking Fuel Line”. (See page G-21.) W1041643 Replacing Radiator Hose (Water Pipes) 1. Replace the hoses and clamps. Refer to “Checking Radiator Hose and Hose Clamp”. (See page G-25.)
  • Page 46 Tractor Manuals Scotland L4400 , WSM G GENERAL Replacing Fuse 1. The tractor electrical system is protected from potential damage by fuses. A blown fuse indicates that there is an overload or short somewhere in the electrical system. 2. If any of the fuses should blow, replace with a new one of the same capacity.

  • Page 47: Special Tools

    Tractor Manuals Scotland L4400 , WSM G 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. W10240500 Piston Ring Compressor...
  • Page 48 Tractor Manuals Scotland L4400 , WSM G 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...
  • Page 49 Tractor Manuals Scotland L4400 , WSM G GENERAL Nozzle Tester Code No : 07909-31361 Application : Use to check the fuel injection pressure and spray pattern of nozzle Measuring: 0 to 50 MPa range: (0 to 500 kgf/cm , 0 to 7000 psi)
  • Page 50 Tractor Manuals Scotland L4400 , WSM G GENERAL Socket Wrench 46 Code No : 07916-30901 Application : Use exclusively for removing or installing the crankshaft nut. W1048209 Auxiliary Socket for Fixing Crankshaft Sleeve Code No : 07916-32091 Application : Use to fix the crankshaft sleeve of the diesel engine.
  • Page 51 Tractor Manuals Scotland L4400 , WSM G GENERAL Bushing Replacing Tools Application : Use to press out and press fit the bushing. (1) For small end bushing 162 mm (6.38 in.) 35 mm (1.38 in.) 27 mm (1.06 in.) 35 mm dia. (1.38 in. dia.) 27.90 to 27.95 mm dia.
  • Page 52 Tractor Manuals Scotland L4400 , WSM G GENERAL Crankshaft Bearing 1 Replacing Tool Application : Use to press out and press fit the crankshaft bearing 1. 1. Extracting tool 135 mm (5.31 in.) 72 mm (2.83 in.) R40 mm (R1.57 in.) 10 mm (0.39 in.)

  • Page 53: Special Tools For Tractor

    Tractor Manuals Scotland L4400 , WSM G GENERAL [2] SPECIAL TOOLS FOR TRACTOR Tie-rod End Lifter Code No : 07909-39051 Application : Use for removing the tie-rod end with ease. W10264720 Steering Wheel Puller Code No : 07916-51090 Application : Use for removing the steering wheel without damaging the steering shaft.
  • Page 54 Tractor Manuals Scotland L4400 , WSM G 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.
  • Page 55 Tractor Manuals Scotland L4400 , WSM G GENERAL Relief Valve Pressure Tester Code No : 07916-50045 Application : This allows easy measurement of relief set pressure. (1) Gauge (07916-50322) (6) Adaptor C (PS3/8) (07916-50371) (2) Cable (07916-50331) (7) Adaptor D (PT1/8) (07916-50381)
  • Page 56 Tractor Manuals Scotland L4400 , WSM G GENERAL Adaptor Set for Flow Meter Code No : 07916-54031 Application : Use for testing the hydraulic system. (1) Adaptor 52 (8) Adaptor 65 (2) Adaptor 53 (9) Adaptor 66 (3) Adaptor 54...
  • Page 57 Tractor Manuals Scotland L4400 , WSM G GENERAL Pump Adaptor Application : Use for checking the main hydraulic pump. Tractor Manuals Scotland - Please Do Not Copy KiSC issued 07, 2007 A G-44...
  • Page 58 Tractor Manuals Scotland L4400 , WSM G GENERAL NOTE • When using, attach with following parts. O-ring : 04811-00180 • This adaptor is modified from Adaptor 61 of flowmeter adaptor set. (See page G-43). 22 mm (0.872 in.) 10 mm dia. (0.39 in. dia.) 61.5 mm (2.42 in.)
  • Page 59 Tractor Manuals Scotland L4400 , WSM G GENERAL Pinion Locking Tool Code No : 07916-52311 Application : Use for preventing the shaft from turning when removing or tighten a bevel pinion shaft staking nut. W10445520 Rear Axle Nut Wrench 71...
  • Page 60 Tractor Manuals Scotland L4400 , WSM G GENERAL NOTE • The following special tools are not provided, so make them referring to the figure. Pinion Shaft Remover Application : Use to press out and press fit the valve guide. 106 mm (4.17 in.) 350 mm (13.78 in.)
  • Page 61 Tractor Manuals Scotland L4400 , WSM G GENERAL Draft Control Test Bar Application : Use for checking the lift range and floating range of hydraulic draft control. 1045 mm (41.14 in.) 1000 mm (29.37 in.) 20 mm dia. (0.79 in. dia.) 30 mm dia.

  • Page 62: Tires

    Tractor Manuals Scotland L4400 , WSM G GENERAL 9. TIRES [1] TIRE PRESSURE Though the tire pressure is factory-set to the prescribed level, it naturally drops slowly in the course of time. Thus, check it everyday and inflate as necessary. To inflate the wheel tires, use an air compressor or hand pump.

  • Page 63: Treads Adjustment

    Tractor Manuals Scotland L4400 , WSM G GENERAL [2] TREADS ADJUSTMENT CAUTION • When working on slopes or working with trailer, set the wheel tread as wide as practice for the job for maximum stability. • Support tractor securely on stands before removing a wheel.
  • Page 64 Tractor Manuals Scotland L4400 , WSM G GENERAL To adjust the tread. 1. Lift the front of the tractor with a jack. 2. Remove the front axle mounting bolts (1) and the tie-rod mounting bolts (2). 3. Move the front axles (right and left) to the desired position, and tighten the bolts.
  • Page 65 Tractor Manuals Scotland L4400 , WSM G GENERAL Front Wheels (4WD) Front tread can not be adjusted. 27 x 27 x 8.50-15 Tire 8.3-16 Farm 10.50LL15 10-16.5 IND Turf Turf 1155 mm 1200 mm 1180 mm 1195 mm Tread (45.5 in.) (47.2 in.)

  • Page 66: Rear Wheels

    Tractor Manuals Scotland L4400 , WSM G GENERAL (2) Rear Wheels Rear tread can be adjusted in 6 steps depending on the model. Models 14.9-24 1180 mm (46.5 in.) 1200 mm (47.2 in.) 1300 mm (51.2 in.) 1450 mm (57.1 in.) 1545 mm (60.8 in.)

  • Page 67: Tire Liquid Injection

    Tractor Manuals Scotland L4400 , WSM G 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 68 Tractor Manuals Scotland L4400 , WSM G GENERAL Attaching Injector 1. Lift the rear tires off the ground. 2. Turn the tire so that the air valve is at the top. 3. Remove the air valve, and attach the injector. (Code No. 07916-...
  • Page 69 Tractor Manuals Scotland L4400 , WSM G 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 70 Tractor Manuals Scotland L4400 , WSM G GENERAL Draining Water or Solution 1. Lift the rear tires off the ground. 2. Turn the tire so that the air valve is at the bottom. 3. Remove the air valve, and drain liquid (liquid can only be drained to the level of the valve and liquid under that level remains inside).

  • Page 71: Implement Limitations

    KUBOTA. Use with implements which are not sold or approved by KUBOTA and which exceed the maximum specifications listed below, or which are otherwise unfit for use with the KUBOTA Tractor may result in malfunctions or failures of the tractor, damage to other property and injury to the operator or others. [Any malfunctions or failures of the tractor resulting from use with improper implements are not covered by the warranty.]...
  • Page 72 Tractor Manuals Scotland L4400 , WSM G GENERAL Implement Remarks L4400 Max. load capacity kg (lbs) 300 (6600) Trailer Max. Drawbar Load kg (lbs) 650 (1430) Max. Cutting Width mm (in.) 1829 (72) Rotary-cutter Max. Weight kg (lbs) 400 (880) Flail Mower Max.
  • Page 73 Tractor Manuals Scotland L4400 , WSM G GENERAL Implement Remarks L4400 Max. Width mm (in.) 1830 (72) Snow Blade Max. Weight kg (lbs) 350 (770) Max. Working Width mm (in.) 1676 (66) Snow Blower Max. Weight kg (lbs) 280 (620) Implement size may vary depending on soil operating conditions.
  • Page 74 Tractor Manuals Scotland ENGINE Tractor Manuals Scotland - Please Do Not Copy KiSC issued 07, 2007 A...
  • Page 75 Tractor Manuals Scotland SERVICING CONTENTS 1. TROUBLESHOOTING ..................1-S1 2. SERVICING SPECIFICATIONS ..............1-S4 3. TIGHTENING TORQUES ................1-S10 4. CHECKING, DISASSEMBLING AND SERVICING........1-S12 [1] CHECKING AND ADJUSTING .............1-S12 (1) Compression Pressure ..............1-S12 (2) Valve Clearance................1-S13 (3) Top Clearance ..................1-S14 (4) Engine Oil Pressure ................1-S15 (5) Fan Belt.....................1-S16 (6) Radiator ....................1-S16 (7) Injection Pump ..................1-S18...

  • Page 76: Troubleshooting

    Tractor Manuals Scotland L4400 , 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-32 Water in the fuel system Change fuel and – repair or replace fuel...
  • Page 77 Tractor Manuals Scotland L4400 , WSM ENGINE Reference Symptom Probable Cause Solution Page Engine Revolution Is Fuel filter clogged or dirty Change G-20 Not Smooth Air cleaner clogged Clean or change G-20 Fuel leak due to loose injection pipe retaining nut...
  • Page 78 Tractor Manuals Scotland L4400 , WSM ENGINE Reference Symptom Probable Cause Solution Page Fuel Mixed into Injection pump’s plunger worn Replace pump – Lubricant Oil element or pump Deficient nozzle injection Repair or replace the 1-S19, S20, nozzle Injection pump broken...

  • Page 79: Servicing Specifications

    Tractor Manuals Scotland L4400 , WSM ENGINE 2. SERVICING SPECIFICATIONS ENGINE BODY Item Factory Specification Allowable Limit Cylinder Head Surface Flatness – 0.05 mm / 500 mm 0.0020 in./ 19.69 in. Compression Pressure 3.53 to 4.02 MPa / 2.55 MPa /...
  • Page 80 Tractor Manuals Scotland L4400 , WSM ENGINE ENGINE BODY (Continued) Item Factory Specification Allowable Limit Valve Timing (Exhaust Valve) Open 1.05 rad (60 °) – before B.D.C. Close 0.21 rad (12 °) – after T.D.C. Valve Spring Free Length 41.7 to 42.2 mm 41.2 mm...
  • Page 81 Tractor Manuals Scotland L4400 , WSM ENGINE ENGINE BODY (Continued) Item Factory Specification Allowable Limit Crankshaft Journal to Crankshaft Bearing 2 Oil Clearance 0.040 to 0.104 mm 0.20 mm 0.00157 to 0.00409 in. 0.0079 in. Crankshaft Journal O.D. 59.921 to 59.940 mm –...
  • Page 82 Tractor Manuals Scotland L4400 , WSM ENGINE COOLING SYSTEM Fan Belt Tension 7.0 to 9.0 mm / (0.28 to – 0.35 in.) deflection at 98 N (10 kgf, 22 lbs) of force Thermostat Valve Opening Temperature At Beginning 69.5 to 72.5 °C –...
  • Page 83 Tractor Manuals Scotland L4400 , WSM ENGINE FUEL SYSTEM Item Factory Specification Allowable Limit Injection Pump Injection Timing 0.30 to 0.33 rad – (17 to 19°) before T.D.C. Pump Element Fuel Tightness – 14.7 MPa 150 kgf/cm 2133 psi Delivery Valve...

  • Page 84: Tightening Torques

    Tractor Manuals Scotland L4400 , 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-9.) Item N·m kgf·m lbf·ft Cap nut for hydraulic pipe 78.8 to 88.3...
  • Page 85 Tractor Manuals Scotland L4400 , WSM ENGINE NOTE • For * marked screws, bolts and nuts on the table, apply engine oil to their threads and seats before tightening. • The letter “M” in Size × Pitch means that the screw, bolt or nut dimension stands for metric. The size is the nominal outside diameter in mm of the threads.

  • Page 86: Checking, Disassembling And Servicing

    Tractor Manuals Scotland L4400 , WSM ENGINE 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING (1) Compression Pressure Compression Pressure 1. Run the engine until it is warmed up. 2. Stop the engine and disconnect the 2P connector from the stop solenoid in order to inject fuel.

  • Page 87: Valve Clearance

    Tractor Manuals Scotland L4400 , WSM ENGINE (2) Valve Clearance 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 cover on the clutch housing.

  • Page 88: Top Clearance

    Tractor Manuals Scotland L4400 , WSM ENGINE (3) Top Clearance Top Clearance 1. Remove the cylinder head. 2. Move the piston and place a strip of fuse on the piston head at three positions with grease. 3. Lower the piston, and install the cylinder head. (Use a new cylinder head gasket and tighten with a specified tightening torque.)
  • Page 89 Tractor Manuals Scotland L4400 , WSM ENGINE ENGINE BODY (Continued) Item Factory Specification Allowable Limit Camshaft Side Clearance 0.07 to 0.22 mm 0.3 mm 0.0028 to 0.0087 in. 0.0118 in. Camshaft Alignment – 0.01 mm 0.0004 in. Height 33.47 mm 33.42 mm...

  • Page 90: Engine Oil Pressure

    Tractor Manuals Scotland L4400 , WSM ENGINE (4) Engine Oil Pressure Engine Oil Pressure 1. Remove the engine oil pressure switch, and set an oil pressure tester (Code No. 07916-32032). (Adaptor screw size : PT 1/8) 2. Start the engine. After warming up, measure the oil pressure of both idling and rated speeds.

  • Page 91: Fan Belt

    Tractor Manuals Scotland L4400 , WSM ENGINE (5) Fan Belt Fan Belt Tension 1. Measure the deflection (A), depressing the belt halfway between the fan drive pulley and alternator pulley at specified force (98 N, 10 kgf, 22 lbs). 2. If the measurement is not within the factory specifications, loosen the alternator mounting screws and relocate the alternator to adjust.
  • Page 92 Tractor Manuals Scotland L4400 , WSM ENGINE Radiator Cap Air 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.

  • Page 93: Injection Pump

    Tractor Manuals Scotland L4400 , WSM ENGINE (7) Injection Pump Injection Timing 1. Remove the stop solenoid. 2. Remove the injection pipes and nozzle. 3. Set the speed control lever to maximum fuel discharge position. (Reference) • Turn the flywheel with screwdriver.

  • Page 94: Injection Nozzle

    Tractor Manuals Scotland L4400 , WSM ENGINE Injection Timing (Continued) NOTE • The sealant is applied to both side of the soft metal gasket shim. The liquid gasket is not required for assembling. • Shims are available in thickness of 0.20 mm, 0.25 mm and 0.30 mm.
  • Page 95 Tractor Manuals Scotland L4400 , WSM ENGINE Fuel Injection Pressure 1. Set the injection nozzle to a nozzle tester. 2. Slowly move the tester handle to measure the pressure at which fuel begins jetting out from the nozzle. 3. If the measurement is not within the factory specifications, replace the adjusting washer (1) in the nozzle holder to adjust it.

  • Page 96: Preparation

    Tractor Manuals Scotland L4400 , WSM ENGINE [2] PREPARATION (1) Separating Engine and Clutch Housing Draining Engine Oil 1. Start and warm up the engine for approx. 5 minutes. 2. Place an oil pan uderneath the engine. 3. Remove the drain plugs (1) to drain oil.
  • Page 97 Tractor Manuals Scotland L4400 , WSM ENGINE Draining the Transmission Fluid 1. Place oil pans underneath the transmission case. 2. Remove the drain plugs (1), (2). 3. Drain the transmission fluid. 4. Reinstall the drain plugs (1), (2). (When refilling) •...
  • Page 98 Tractor Manuals Scotland L4400 , WSM ENGINE Bonnet and Front Cover 1. Disconnect the battery negative cable (1). 2. Disconnect the connector to head light and the head light wiring. 3. Remove bonnet (2) and side covers (3) on both sides.
  • Page 99 Tractor Manuals Scotland L4400 , WSM ENGINE Steering Wheel and Rear Bonnet 1. Remove steering wheel (1) with steering puller. 2. Remove throttle grip (2). 3. Disconnect hourmeter cable from engine. 4. Remove meter panel (3). 5. Disconnect 4P connector (5) to main switch.
  • Page 100 Tractor Manuals Scotland L4400 , WSM ENGINE Wiring, Pipes and Rods 1. Disconnect 1P connector (1) to water temperature sensor. 2. Disconnect glow plug terminal (10). 3. Disconnect accelerator rod cable (2), head light wiring (8), 2P connector to key stop solenoid (9) and then set aside the wiring harness.
  • Page 101 Tractor Manuals Scotland L4400 , WSM ENGINE Hydraulic Pipe 1. Disconnect the right delivery hose (3) and the left delivery hose (4). 46.2 to 50.9 N·m Main delivery hose 4.8 to5.2 kgf·m retaining nut 34.4 to 37.6 ft-lbs Tightening torque 24.5 to 29.4 N·m...
  • Page 102 Tractor Manuals Scotland L4400 , WSM ENGINE Separating Engine from Clutch Housing 1. Place the disassembling stand under the engine and clutch housing case. 2. Remove the steering support plates connecting steering support and rear bonnet support. 3. Remove the engine and clutch housing mounting screws and nuts.

  • Page 103: Separating Engine From Front Axle Frame

    Tractor Manuals Scotland L4400 , WSM ENGINE (2) Separating Engine from Front Axle Frame Fuel Tank 1. Disconnect the fuel pipe (4) and drain the fuel. 2. Disconnect fuel return tubes (2). 3. Remove rear bonnet support mounting screws (3) on both sides.
  • Page 104 Tractor Manuals Scotland L4400 , WSM ENGINE Separating Engine from Front Axle Frame 1. Remove one of the two engine hooks (1) and mount it on the right rear side of the engine. 2. Hoist the engine by the chain at the engine hook (2), (3).

  • Page 105: Disassembling And Assembling

    Tractor Manuals Scotland L4400 , WSM ENGINE [3] DISASSEMBLING AND ASSEMBLING (1) Cylinder Head and Valves External Components 1. Set the engine to the disassembling stand. 2. Remove the cooling fan (1). 3. Remove the alternator (3) and fan belt (2).
  • Page 106 Tractor Manuals Scotland L4400 , WSM ENGINE Hydraulic Pump and Other External Components 1. Remove hydraulic pump mounting screws and detach hydraulic pump (1). 2. Remove accelerator cable (2), hour meter flexible cable (3). (1) Hydraulic Pump (3) Hour Meter Flexible Cable...
  • Page 107 Tractor Manuals Scotland L4400 , 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 grooves.
  • Page 108 Tractor Manuals Scotland L4400 , WSM ENGINE Tappets 1. Remove the tappets (1) from the crankcase. (When reassembling) • Visually check the contact between tappets and cams for proper rotation. If defect is found, replace tappets. • Before installing the tappets, apply engine oil thinly around them.

  • Page 109: Timing Gears, Camshaft And Fuel Camshaft

    Tractor Manuals Scotland L4400 , WSM ENGINE (2) Timing Gears, Camshaft and Fuel Camshaft Injection Pump 1. Remove the stop solenoid (1) and hi-idling body (2). 2. Remove the engine stop lever (3) and stop solenoid guide (5). 3. Remove the fuel injection pump assembly (4).
  • Page 110 Tractor Manuals Scotland L4400 , WSM ENGINE Governor Springs and Speed Control Plate NOTE • Specific tool (1) : 1.2 mm diameter hard wire with its end hooked, overall length 200 mm (7.87 in.) The tip of wire is bent like the hook to hang governor springs.
  • Page 111 Tractor Manuals Scotland L4400 , WSM ENGINE Governor Springs and Speed Control Plate (Continued) (When reassembling) • Hook the small spring (4) first and then the large governor spring (2) on the speed control plate (6). • Put the specific tool (1) from the injection pump side to catch the large governor spring (2).
  • Page 112 Tractor Manuals Scotland L4400 , WSM ENGINE Fan Drive Pulley 1. Remove the crankshaft nut. 2. Draw out the fan drive pulley (1) with a puller. (When reassembling) • Do not tighten the nut excessively, it may damage the oil slinger, causing oil leakage.
  • Page 113 Tractor Manuals Scotland L4400 , WSM ENGINE Idle Gear 1. Remove the external snap ring. 2. Detach the idle gear collar. 3. Detach the idle gear (2). (When reassembling) • Check to see each gear is aligned with its aligning mark.

  • Page 114: Piston And Connecting Rod

    Tractor Manuals Scotland L4400 , WSM ENGINE Oil Pump 1. Remove the oil pump drive gear mounting nut, and draw out the oil pump drive gear (1) with a puller. 2. Remove the four oil pump mounting screws. 3. Detach the oil pump (2).
  • Page 115 Tractor Manuals Scotland L4400 , WSM ENGINE Pistons 1. Completely clean carbon (1) from the cylinders. 2. Remove the connecting rod cap (3). 3. Turn the flywheel and bring the piston to top dead center. 4. Draw out the piston upward by lightly tapping it from the bottom of the crankcase with the grip of a hammer.
  • Page 116 Tractor Manuals Scotland L4400 , WSM ENGINE Pistons (Continued) (When reassembling) • Before inserting piston into the cylinder, apply enough engine oil to the piston. • When inserting the piston into the cylinder, face the mark on the connecting rod to the injection pump.
  • Page 117 Tractor Manuals Scotland L4400 , WSM ENGINE Piston Ring and Connecting Rod 1. Remove the piston rings (4), (5), (6) using a piston ring tool (Code No. 07909-32121). 2. Place the tip of a small straight edge screwdriver at the piston hollow (13), compress the piston pin snap ring (3) in the radial direction and then remove the piston snap ring.

  • Page 118: Crankshaft

    Tractor Manuals Scotland L4400 , WSM ENGINE Piston Ring and Connecting Rod NOTE • Be sure not to position the gap of piston pin snap ring (3) facing the pisiton hollow (13). • Use new piston pin snap rings when reassembling.
  • Page 119 Tractor Manuals Scotland L4400 , WSM ENGINE Bearing Case Cover 1. Remove the bearing case cover mounting screws. First, remove inside screws (6) and then outside screws (3). 2. Screw two removed screws into the screw hole of bearing case cover (5) to remove it.
  • Page 120 Tractor Manuals Scotland L4400 , WSM ENGINE Main Bearing Case Assembly 1. Remove the two main bearing case screws 1, and remove the main bearing case assembly (2) being careful with thrust bearing (3) and crankshaft bearing 2. 2. Remove the main bearing case 1, 2 and 3.

  • Page 121: Thermostat

    Tractor Manuals Scotland L4400 , WSM ENGINE (5) Thermostat 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. Thermostat Assembly 1.

  • Page 122: Servicing

    Tractor Manuals Scotland L4400 , WSM ENGINE [4] SERVICING (1) Cylinder Head and Valves Cylinder Head Surface Flatness 1. Clean the cylinder head surface. 2. Place a straightedge on the cylinder head’s four sides and two diagonal as shown in the figure.
  • Page 123 Tractor Manuals Scotland L4400 , WSM ENGINE Valve Recessing 1. Clean the cylinder head surface, valve face and valve seat. 2. Insert the valve into the valve guide. 3. Measure the valve recessing with a depth gauge. 4. If the measurement exceeds the allowable limit, replace the valve.
  • Page 124 Tractor Manuals Scotland L4400 , 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.
  • Page 125 Tractor Manuals Scotland L4400 , 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 126 Tractor Manuals Scotland L4400 , WSM ENGINE Free Length and Tilt of Valve Spring 1. Measure the free length (A) 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 127 Tractor Manuals Scotland L4400 , 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 128: Timing Gears, Camshaft And Fuel Camshaft

    Tractor Manuals Scotland L4400 , WSM ENGINE (2) Timing Gears, Camshaft and Fuel Camshaft Timing Gear Backlash 1. Set a dial indicator (lever type) with its tip on the gear tooth. 2. Move the gear to measure the backlash, holding its mating gear.
  • Page 129 Tractor Manuals Scotland L4400 , WSM ENGINE Oil Clearance between Idle Gear Shaft and Idle Gear Bushing 1. Measure the idle gear shaft O.D. with an outside micrometer. 2. Measure the idle gear bushing I.D. with an inside micrometer, and calculate the oil clearance.

  • Page 130: Piston And Connecting Rod

    Tractor Manuals Scotland L4400 , 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.
  • Page 131 Tractor Manuals Scotland L4400 , WSM ENGINE Replacing Connecting Rod Small End Bushing (When removing) 1. Press out the small end bushing with a connecting rod small end bushing replacing tool. (When installing) 1. Clean a new small end bushing and bore, and apply engine oil to them.

  • Page 132: Crankshaft

    Tractor Manuals Scotland L4400 , 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.
  • Page 133 Tractor Manuals Scotland L4400 , WSM ENGINE Crankshaft Alignment 1. Support the crankshaft with V blocks on the surface plate and set a dial indicator with its tip on the intermediate journal at right angle. 2. Rotate the crankshaft on the V blocks and get the misalignment (half of the measurement).
  • Page 134 Tractor Manuals Scotland L4400 , WSM ENGINE Oil Clearance between Crankshaft Journal and Crankshaft Bearing 1 1. Measure the O.D. of the crankshaft journal with an outside micrometer. 2. Measure the I.D. of the crankshaft bearing 1 with an inside micrometer, and calculate oil clearance.
  • Page 135 Tractor Manuals Scotland L4400 , WSM ENGINE Oil Clearance between Crankshaft Journal and Crankshaft Bearing 2 1. Put a strip of plastigage on the center of the journal. 2. Install the bearing case and tighten the bearing case screws 1 to the specified torque, and remove the bearing case again.
  • Page 136 Tractor Manuals Scotland L4400 , WSM ENGINE Replacing Crankshaft Sleeve 1. Remove the used crankshaft sleeve (3) using a special-use puller set (Code No. 07916-09032). 2. Set the sleeve guide (2) to the crankshaft (5). 3. Set the stopper (1) to the crankshaft as shown in figure.

  • Page 137: Cylinder

    Tractor Manuals Scotland L4400 , WSM ENGINE (5) Cylinder Cylinder Wear 1. Measure the I.D. of the cylinder at the six positions (see figure) with a cylinder gauge to find the maximum and minimum I.D.’s. 2. Get the difference (Maximum wear) between the maximum and the minimum I.D.’s.

  • Page 138: Oil Pump

    Tractor Manuals Scotland L4400 , WSM ENGINE (6) Oil Pump Rotor Lobe Clearance 1. Measure the clearance between lobes of the inner rotor and the outer rotor with a feeler gauge. 2. Measure the clearance between the outer rotor and the pump body with a feeler gauge.
  • Page 139 Tractor Manuals Scotland CLUTCH Tractor Manuals Scotland - Please Do Not Copy KiSC issued 07, 2007 A...
  • Page 140 Tractor Manuals Scotland MECHANISM CONTENTS 1. STRUCTURE ....................2-M1 [1] TRAVELING CLUTCH ................2-M1 [2] HYDRAULIC PTO CLUTCH ..............2-M2 Tractor Manuals Scotland - Please Do Not Copy KiSC issued 07, 2007 A...
  • Page 141 Tractor Manuals Scotland L4400 , WSM CLUTCH 1. STRUCTURE [1] TRAVELING CLUTCH This tractor is equipped with dry single plate type clutch. The clutch is located between the engine and the transmission and is operated by stepping on the clutch pedal (13).
  • Page 142 Tractor Manuals Scotland L4400 , WSM CLUTCH [2] HYDRAULIC PTO CLUTCH Hydraulic multiple disk clutch is used for tractor with independent PTO. PTO is controlled by PTO clutch pack (2) activated by PTO clutch valve and independent of the driving system.
  • Page 143 Tractor Manuals Scotland L4400 , WSM CLUTCH Oil Flow The oil adjusted the pressure by the regulator valve flows into the PTO clutch valve (2). When the PTO lever is at the "DISENGAGED" position, the oil does not flow through the PTO clutch valve (2) to the PTO clutch pack (3).
  • Page 144 Tractor Manuals Scotland SERVICING CONTENTS 1. TROUBLESHOOTING ..................2-S1 [1] TRAVELING CLUTCH ................2-S1 [2] PTO CLUTCH ..................2-S2 2. SERVICING SPECIFICATIONS ..............2-S3 [1] TRAVELING CLUTCH ................2-S3 [2] PTO CLUTCH ..................2-S3 3. TIGHTENING TORQUES ................2-S4 4. CHECKING, DISASSEMBLING SERVICING (TRAVELING CLUTCH) ......................2-S5 [1] CHECKING AND ADJUSTING ...............2-S5 [2] PREPARATION ..................2-S6 (1) Separating Engine from Clutch Housing..........2-S6 [3] DISASSEMBLING AND ASSEMBLING..........2-S11...

  • Page 145: Troubleshooting

    Tractor Manuals Scotland L4400 , WSM CLUTCH 1. TROUBLESHOOTING [1] TRAVELING CLUTCH Reference Symptom Probable Cause Solution Page Clutch Drags Too much free play in the clutch Adjust 2-S5 Dust on clutch disc generated from clutch disc Remove dust –...

  • Page 146: Pto Clutch

    Tractor Manuals Scotland L4400 , WSM CLUTCH [2] PTO CLUTCH Reference Symptom Probable Cause Solution Page PTO Clutch Slips Operating pressure is low Adjust 2-S14 PTO clutch valve malfunctioning Repair or replace 2-S23 Clutch disc or drive plate excessively worn...

  • Page 147: Servicing Specifications

    Tractor Manuals Scotland L4400 , WSM CLUTCH 2. SERVICING SPECIFICATIONS [1] TRAVELING CLUTCH Item Factory Specification Allowable Limit Clutch Pedal Free Travel 20 to 30 mm – 0.8 to 1.2 in. Clutch Disc Disc Surface to – 0.3 mm Rivet Top (Depth) 0.012 in.
  • Page 148 Tractor Manuals Scotland L4400 , 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-9.) Item N·m kgf·m ft-lbs Main delivery pipe and return pipe retaining nut 46.6 to 50.9...

  • Page 149: Checking And Adjusting

    Tractor Manuals Scotland L4400 , WSM CLUTCH 4. CHECKING, DISASSEMBLING SERVICING (TRAVELING CLUTCH) [1] CHECKING AND ADJUSTING Adjusting Clutch Pedal Free Play 1. Slightly depress the clutch pedal (5) and measure free travel on top of clutch pedal. 2. If the measurement is not within the factory specifications, loosen the lock nut (2), remove the cotter pin (3) and the clevis pin (4), then adjust the length of rod (1) within acceptable limits.

  • Page 150: Preparation

    Tractor Manuals Scotland L4400 , WSM CLUTCH [2] PREPARATION (1) Separating Engine from Clutch Housing Draining the Transmission Fluid 1. Place oil pans underneath the transmission case. 2. Remove the drain plugs (1), (2). 3. Drain the transmission fluid. 4. Reinstall the drain plugs (1), (2).
  • Page 151 Tractor Manuals Scotland L4400 , WSM CLUTCH Bonnet and Front Cover 1. Disconnect the battery negative cable (1). 2. Disconnect the connector to head light and the head light wiring. 3. Remove bonnet (2) and side covers (3) on both sides.
  • Page 152 Tractor Manuals Scotland L4400 , WSM CLUTCH Steering Wheel and Rear Bonnet 1. Remove steering wheel (1) with steering puller. 2. Remove throttle grip (2). 3. Disconnect hourmeter cable from engine. 4. Remove meter panel (3). 5. Disconnect 4P connector (5) to main switch.
  • Page 153 Tractor Manuals Scotland L4400 , WSM CLUTCH Wiring, Pipes and Rods 1. Disconnect 1P connector (1) to water temperature sensor. 2. Disconnect glow plug terminal (10). 3. Disconnect accelerator rod cable (2), head light wiring (8), 2P connector to key stop solenoid (9) and then set aside the wiring harness.
  • Page 154 Tractor Manuals Scotland L4400 , WSM CLUTCH Hydraulic Pipe 1. Disconnect the right delivery hose (3) and the left delivery hose (4). 46.2 to 50.9 N·m Main delivery hose 4.8 to5.2 kgf·m retaining nut 34.4 to 37.6 ft-lbs Tightening torque 24.5 to 29.4 N·m...
  • Page 155 Tractor Manuals Scotland L4400 , WSM CLUTCH Separating Engine from Clutch Housing 1. Place the disassembling stand under the engine and clutch housing case. 2. Remove the steering support plates connecting steering support and rear bonnet support. 3. Remove the engine and clutch housing mounting screws and nuts.
  • Page 156 Tractor Manuals Scotland L4400 , WSM CLUTCH Release Fork and Clutch Lever 1. Draw out the clutch release hub (4) and the release bearing (5) as a unit. 2. Remove the release fork setting screws (2). 3. Draw out the clutch lever (3) to remove the release fork (1).
  • Page 157 Tractor Manuals Scotland L4400 , WSM CLUTCH Clutch Disc Wear 1. Measure the depth from clutch disc surface to the top of rivet at least 10 points with a depth gauge. 2. If the depth is less than the allowable limit, replace the disc.

  • Page 158: Servicing

    Tractor Manuals Scotland L4400 , WSM CLUTCH 5. CHECKING, DISASSEMBLING SERVICING (HYDRAULIC PTO CLUTCH) [1] CHECKING AND ADJUSTING Adjusting Valve Setting Pressure 1. Start the engine and warm up the transmission fluid, and then stop the engine. 2. Remove the plug (1) (PT 1/8) on the PTO valve spool (2).

  • Page 159: Preparation

    Tractor Manuals Scotland L4400 , WSM CLUTCH [2] PREPARATION (1) Separating Engine from Clutch Housing Draining the Transmission Fluid 1. Place oil pans underneath the transmission case. 2. Remove the drain plugs (1), (2). 3. Drain the transmission fluid. 4. Reinstall the drain plugs (1), (2).
  • Page 160 Tractor Manuals Scotland L4400 , WSM CLUTCH Bonnet and Front Cover 1. Disconnect the battery negative cable (1). 2. Disconnect the connector to head light and the head light wiring. 3. Remove bonnet (2) and side covers (3) on both sides.
  • Page 161 Tractor Manuals Scotland L4400 , WSM CLUTCH Steering Wheel and Rear Bonnet 1. Remove steering wheel (1) with steering puller. 2. Remove throttle grip (2). 3. Disconnect hourmeter cable from engine. 4. Remove meter panel (3). 5. Disconnect 4P connector (5) to main switch.
  • Page 162 Tractor Manuals Scotland L4400 , WSM CLUTCH Wiring, Pipes and Rods 1. Disconnect 1P connector (1) to water temperature sensor. 2. Disconnect glow plug terminal (10). 3. Disconnect accelerator rod cable (2), head light wiring (8), 2P connector to key stop solenoid (9) and then set aside the wiring harness.
  • Page 163 Tractor Manuals Scotland L4400 , WSM CLUTCH Hydraulic Pipe 1. Disconnect the right delivery hose (3) and the left delivery hose (4). 46.2 to 50.9 N·m Main delivery hose 4.8 to5.2 kgf·m retaining nut 34.4 to 37.6 ft-lbs Tightening torque 24.5 to 29.4 N·m...

  • Page 164: Separating Clutch Housing Mid Case

    Tractor Manuals Scotland L4400 , WSM CLUTCH Separating Engine from Clutch Housing 1. Place the disassembling stand under the engine and clutch housing case. 2. Remove the steering support plates connecting steering support and rear bonnet support. 3. Remove the engine and clutch housing mounting screws and nuts.
  • Page 165 Tractor Manuals Scotland L4400 , WSM CLUTCH Suction Pipe and Hydraulic Block 1. Remove suction pipe (1), (4). 2. Remove oil filter bracket (3) together with oil filter (9). 3. Remove hydraulic block (8) together with return pipe (7). 4. Remove 3P delivery pipe (2), I-PTO delivery pipe (5).
  • Page 166 Tractor Manuals Scotland L4400 , WSM CLUTCH Separating Mid Case from Transmission Case 1. Loosen and remove screws and nuts securing mid case (2) to transmission case (3). 2. Separate mid case from transmission case (3). (When reassembling) • Apply liquid gasket (Three Bond 1208D or equivalent) to joint face of mid case and transmission case after eliminate water, oil and stuck liquid gasket.

  • Page 167: Disassembling And Assembling

    Tractor Manuals Scotland L4400 , WSM CLUTCH [3] DISASSEMBLING AND ASSEMBLING PTO Clutch Valve, PTO Clutch Holder 1. Remove PTO clutch valve (1). 2. Remove PTO clutch holder (6) together with PTO clutch pack (5) by using two jack screw M8 (3).
  • Page 168 Tractor Manuals Scotland L4400 , WSM CLUTCH Clutch Hub and Clutch Discs 1. Remove the internal snap ring (8), and then take out the clutch discs (5), the back plate (7), the steel plates (6), (9), (10), (11) and (12), the hub (3) and the bearings (2).
  • Page 169 Tractor Manuals Scotland L4400 , WSM CLUTCH Modulating Valve 1. Remove the internal snap ring (1). 2. Remove the spring seat (2). 3. Draw out the spring (3) and piston (4). (1) Internal Snap Ring (3) Spring (2) Spring Seat...
  • Page 170 Tractor Manuals Scotland L4400 , WSM CLUTCH Clutch Case 1. Press the washer (6) lightly by the hand press, using the hand made jig. (Refer to the figure.) 2. Draw out the piston (4). (When reassembling) • Apply enough transmission fluid to seal rings (3) and (8).
  • Page 171 Tractor Manuals Scotland L4400 , WSM CLUTCH Flatness of PTO Piston and PTO Steel Plate 1. Place the part on a surface plate. 2. Check it unable to insert a feeler gauge (allowable limit size) underneath it at least four points.

  • Page 172: Servicing

    Tractor Manuals Scotland L4400 , WSM CLUTCH 6. CHECKING, DISASSEMBLING SERVICING (HYDRAULIC PTO CLUTCH VALVE) [1] CHECKING AND ADJUSTING Relief Valve Setting Pressure 1. Start the engine and warm up the transmission fluid, and then stop the engine. 2. Remove the plug (1) (PT 1/8) on the PTO valve spool (2).

  • Page 173: Preparation

    Tractor Manuals Scotland L4400 , WSM CLUTCH [2] PREPARATION Draining the Transmission Fluid 1. Place oil pans underneath the transmission case. 2. Remove the drain plugs (1), (2). 3. Drain the transmission fluid. 4. Reinstall the drain plugs (1), (2).

  • Page 174: Disassembling And Assembling

    Tractor Manuals Scotland L4400 , WSM CLUTCH Hose and Pipes 1. Remove the suction hose (1). 2. Remove the PTO delivery pipe (2) and 3P delivery pipe 2 (3). 3. Remove the suction pipe 1 (4). 4. Remove the brake rod (5).
  • Page 175 Tractor Manuals Scotland L4400 , WSM CLUTCH Clutch Valve Spool 1. Remove the oil seal and the external snap ring (5). 2. Draw out the spool (6). 3. Make a marks on the spool (6) and the lever (4). 4. Remove the spring (3) and tap out the spring pin (7), and then remove the lever (4).
  • Page 176 Tractor Manuals Scotland TRANSMISSION Tractor Manuals Scotland - Please Do Not Copy KiSC issued 07, 2007 A...
  • Page 177 Tractor Manuals Scotland MECHANISM CONTENTS 1. STRUCTURE ....................3-M1 Tractor Manuals Scotland - Please Do Not Copy KiSC issued 07, 2007 A...
  • Page 178 Tractor Manuals Scotland L4400, WSM TRANSMISSION 1. STRUCTURE 3TLAAAC3P001A (1) Main Gear Shift Section (2) PTO Clutch Pack (3) Front Wheel Drive Shift Section (4) Lo-Reverse, Hi Shift Section A : To Front Wheels B : To Rear Wheels Tractor Manuals Scotland - Please Do Not Copy...
  • Page 179 Tractor Manuals Scotland SERVICING CONTENTS 1. TROUBLESHOOTING ..................3-S1 2. SERVICING SPECIFICATIONS ..............3-S3 3. TIGHTENING TORQUES ................3-S4 4. CHECKING, DISASSEMBLING AND SERVICING........3-S6 [1] PREPARATION ..................3-S6 (1) Separating Engine and Clutch Housing ..........3-S6 (2) Separating Clutch Housing from Mid Case ........3-S11 (3) Separating Transmission ..............3-S14 [2] DISASSEMBLING AND ASSEMBLING..........3-S20 (1) Clutch Housing..................3-S20 (2) Mid Case...................3-S24...

  • Page 180: Troubleshooting

    Tractor Manuals Scotland L4400 , WSM TRANSMISSION 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Excessive Transmission fluid insufficient Replenish 3-S6 Transmission Noise Gear worn or backlash improper Replace 3-S32 Bearing worn or broken Replace 3-S31 Shift fork worn Replace...
  • Page 181 Tractor Manuals Scotland L4400 , WSM TRANSMISSION Reference Symptom Probable Cause Solution Page Excessive or Improper backlash between spiral bevel pinion Adjust 3-S35 Unusual Noise at All and spiral bevel gear Time Improper backlash between differential pinion Adjust 3-S37 and differential side gear...

  • Page 182: Servicing Specifications

    Tractor Manuals Scotland L4400 , WSM TRANSMISSION 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Gear to Spline, Hub to Spline Clearance 0.030 to 0.078 mm 0.2 mm 0.00118 to 0.00307 in. 0.008 in. Shift Fork and Shift Gear Groove Clearance 0.15 to 0.40 mm...

  • Page 183: Tightening Torques

    Tractor Manuals Scotland L4400 , 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-9.) Item N·m kgf·m ft-lbs Power steering main delivery hose retaining nut to 46.9 to 50.9...
  • Page 184 Tractor Manuals Scotland L4400 , WSM TRANSMISSION Item N·m kgf·m ft-lbs Rear axle case mounting M10 nuts 60.8 to 70.5 6.2 to 7.2 44.9 to 52.1 Rear axle case mounting M12 screws and nuts 77.5 to 90.2 7.9 to 9.2 57.1 to 66.5...

  • Page 185: Checking, Disassembling And Servicing

    Tractor Manuals Scotland L4400 , WSM TRANSMISSION 4. CHECKING, DISASSEMBLING AND SERVICING [1] PREPARATION (1) Separating Engine and Clutch Housing Draining the Transmission Fluid 1. Place oil pans underneath the transmission case. 2. Remove the drain plugs (1), (2). 3. Drain the transmission fluid.
  • Page 186 Tractor Manuals Scotland L4400 , WSM TRANSMISSION Bonnet and Front Cover 1. Disconnect the battery negative cable (1). 2. Disconnect the connector to head light and the head light wiring. 3. Remove bonnet (2) and side covers (3) on both sides.
  • Page 187 Tractor Manuals Scotland L4400 , WSM TRANSMISSION Steering Wheel and Rear Bonnet 1. Remove steering wheel (1) with steering puller. 2. Remove throttle grip (2). 3. Disconnect hourmeter cable from engine. 4. Remove meter panel (3). 5. Disconnect 4P connector (5) to main switch.
  • Page 188 Tractor Manuals Scotland L4400 , WSM TRANSMISSION Wiring, Pipes and Rods 1. Disconnect 1P connector (1) to water temperature sensor. 2. Disconnect glow plug terminal (10). 3. Disconnect accelerator rod cable (2), head light wiring (8), 2P connector to key stop solenoid (9) and then set aside the wiring harness.
  • Page 189 Tractor Manuals Scotland L4400 , WSM TRANSMISSION Hydraulic Pipe 1. Disconnect the right delivery hose (3) and the left delivery hose (4). 46.2 to 50.9 N·m Main delivery hose 4.8 to5.2 kgf·m retaining nut 34.4 to 37.6 ft-lbs Tightening torque 24.5 to 29.4 N·m...

  • Page 190: Separating Clutch Housing From Mid Case

    Tractor Manuals Scotland L4400 , WSM TRANSMISSION Separating Engine from Clutch Housing 1. Place the disassembling stand under the engine and clutch housing case. 2. Remove the steering support plates connecting steering support and rear bonnet support. 3. Remove the engine and clutch housing mounting screws and nuts.
  • Page 191 Tractor Manuals Scotland L4400 , WSM TRANSMISSION Suction Pipe and Hydraulic Block 1. Remove suction pipe (1), (4). 2. Remove oil filter bracket (3) together with oil filter (9). 3. Remove hydraulic block (8) together with return pipe (7). 4. Remove 3P delivery pipe (2), I-PTO delivery pipe (5).
  • Page 192 Tractor Manuals Scotland L4400 , WSM TRANSMISSION Separating Mid Case from Transmission Case 1. Loosen and remove screws and nuts securing mid case (2) to transmission case (3). 2. Separate mid case from transmission case (3). (When reassembling) • Apply liquid gasket (Three Bond 1208D or equivalent) to joint face of mid case and transmission case after eliminate water, oil and stuck liquid gasket.

  • Page 193: Separating Transmission

    Tractor Manuals Scotland L4400 , WSM TRANSMISSION (3) Separating Transmission Draining the Transmission Fluid 1. Place oil pans underneath the transmission case. 2. Remove the drain plugs (1), (2). 3. Drain the transmission fluid. 4. Reinstall the drain plugs (1), (2).
  • Page 194 Tractor Manuals Scotland L4400 , WSM TRANSMISSION Three Point Linkage and ROPS 1. Secure the ROPS (1) with safety strap (2). 2. Remove stabilizer joint (3), top link (4), lift rods (5) and low links (6). 3. Unscrew ROPS mounting screws (7), then the ROPS.
  • Page 195 Tractor Manuals Scotland L4400 , WSM TRANSMISSION Step and Center Cover 1. Disconnect foot accelerator rod (1). 2. Disconnect differential lock pedal (2). 3. Remove step (3) and center cover (4). (1) Foot Accelerator Rod (3) Step (2) Differential Lock Pedal...
  • Page 196 Tractor Manuals Scotland L4400 , WSM TRANSMISSION Main Gear Shift Lever 1. Shift main gear shift lever (1) to neutral position. 2. Unscrew mounting screws and remove main gear shift base (2). (When reassembling) • Apply grease to the O-rings (3) and take care not to damage it.
  • Page 197 Tractor Manuals Scotland L4400 , WSM TRANSMISSION Fender, Wiring Harness 1. Disconnect rear combination lamp connector RH (1) and LH, PTO switch connector (2), and then clear wiring harness (3) from the hydraulic cylinder. 2. Remove upper part of position control lever (4), 3P delivery pipe (5), fenders (6), fender stay (7), and seat support (8).
  • Page 198 Tractor Manuals Scotland L4400 , WSM TRANSMISSION Rear Axle Case 1. Place the support stand under the rear axle case. 2. Loosen and remove the rear axle case mounting screws and nuts. 3. Support the rear axle case with nylon lift strap and hoist.

  • Page 199: Disassembling And Assembling

    Tractor Manuals Scotland L4400 , WSM TRANSMISSION [2] DISASSEMBLING AND ASSEMBLING (1) Clutch Housing Clutch Lever, Release Fork and Release Bearing 1. Remove the release fork mounting screws (2). 2. Draw out the clutch lever (3) to remove the release fork (1).
  • Page 200 Tractor Manuals Scotland L4400 , WSM TRANSMISSION 24T Gear Shaft and 27T Gear 1. Remove the 24T gear shaft (1). 2. Remove the external snap ring (2) and 27T gear (3). (1) 24T Gear Shaft (3) 27T Gear (2) External Snap Ring...
  • Page 201 Tractor Manuals Scotland L4400 , WSM TRANSMISSION Gear Shaft Assemblies 1. Remove shift fork assembly (1), (2) together with counter gear shaft assembly (3). 2. Remove main gear shaft assembly (4), I-PTO counter gear shaft assembly (5), I-PTO gear shaft assembly (6), and then PTO gear shaft (7).
  • Page 202 Tractor Manuals Scotland L4400 , WSM TRANSMISSION Rear Propeller Shaft Tool Application : For instaling bearing, oil seals and sleeves on rear propeller shaft. Bearing and oil seal :(1) Sleeves : (1) and (2) 40 mm dia. (1.57 in. dia.) 26 mm dia.

  • Page 203: Mid Case

    Tractor Manuals Scotland L4400 , WSM TRANSMISSION (2) Mid Case NOTE • Refer to section 2. CLUTCH (See page 2-S14) for hydraulic PTO clutch. PTO Clutch Valve, PTO Clutch Holder 1. Remove PTO clutch valve (1). 2. Remove PTO clutch holder (6) together with PTO clutch pack (5) by using two jack screw M8 (3).

  • Page 204: Transmission Case

    Tractor Manuals Scotland L4400 , WSM TRANSMISSION (3) Transmission Case Pinion Bearing Cover 1. Remove the stake of lock nut (5). 2. Fix the 37T - 22T gear by pinion locking tool (Code No. 07916- 52311) and remove the lock nut (5).
  • Page 205 Tractor Manuals Scotland L4400 , WSM TRANSMISSION Transmission Bearing Holder 1. Remove spring pin (2) holding Hi-shift fork rod (3) to transmission bearing holder (1). 2. Remove transmission bearing holder by using 2 jack screws M8 (4). (1) Transmission Bearing Holder...
  • Page 206 Tractor Manuals Scotland L4400 , WSM TRANSMISSION Shaft Assemblies 1. Remove front wheel drive gear shaft assembly (7). 2. Remove pinion gear shaft assembly (2) and Hi-shift fork (1). 3. Remove PTO gear shaft assembly (6). (1) Hi-shift Fork Rod...
  • Page 207 Tractor Manuals Scotland L4400 , WSM TRANSMISSION Shaft Assemblies (Continued) 1. Remove Lo-reverse gear shaft assembly (4). 2. Remove Lo-reverse fork rod (3), front wheel drive shift lever (5). (1) Hi-shift Fork Rod (5) Front Wheel Drive Shift Lever (2) Pinion Gear Shaft...
  • Page 208 Tractor Manuals Scotland L4400 , WSM TRANSMISSION PTO Shaft 1. Remove the PTO shaft cover. 2. Remove the bearing case mounting screws, and draw out the PTO shaft (1) with bearing case (2). 3. Remove the internal snap ring (3).
  • Page 209 Tractor Manuals Scotland L4400 , WSM TRANSMISSION Bearing and Differential Lock Shifter 1. Secure the differential gear in a vise. 2. Remove the differential lock shifter and taper roller bearing as a unit with a puller. W14789652 Differential Case Cover and Differential Side Gear 1.

  • Page 210: Servicing

    Tractor Manuals Scotland L4400 , WSM TRANSMISSION Differential Pinion Shaft and Differential Pinion 1. Draw out the differential pinion shaft 2 (5), and take out the differential pinion (3) and differential pinion washer (4). 2. Draw out the differential pinion shaft (1), and take out the differential pinion (2) and differential pinion washer.
  • Page 211 Tractor Manuals Scotland L4400 , WSM TRANSMISSION Gear Backlash 1. Set a dial indicator (lever type) on one of the tooth faces. 2. Clamp the mating gear. 3. Measure backlash by turning the gear to be measured. 4. If the reading exceeds the allowable limit, replace the gear.

  • Page 212: Transmission Case

    Tractor Manuals Scotland L4400 , WSM TRANSMISSION (2) Transmission Case Checking Bearing 1. Hold the inner race, 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 213 Tractor Manuals Scotland L4400 , WSM TRANSMISSION Free Length of the Shift Fork Spring 1. Measure free length of spring with vernier caliper. 2. If the free length is less than the allowable limit, replace. 22 mm Factory spec. 0.866 in.
  • Page 214 Tractor Manuals Scotland L4400 , WSM TRANSMISSION Backlash and Tooth Contact between Spiral Bevel Gear and Spiral Bevel Pinion Shaft 1. Set the dial indicator (lever type) with its finger on the tooth surface. 2. Measure the backlash by fixing the spiral bevel pinion shaft (3) and moving the spiral bevel gear (4) by hand.
  • Page 215 Tractor Manuals Scotland L4400 , WSM TRANSMISSION More than 35 % red lead contact area on the gear tooth surface.The center of tooth contact at 1/3 of the entire width from the small end. (A) Proper Contact W10187470 Replace the adjusting shim (2) with thicker one to move the spiral bevel pinion shaft backward.
  • Page 216 Tractor Manuals Scotland L4400 , WSM TRANSMISSION Clearance between Differential Pinion Shaft and Differential Pinion 1. Measure the differential pinion shaft O.D. 2. Measure the differential pinion I.D. and calculate the clearance. 3. If the clearance exceeds the allowable limit, replace them.

  • Page 217: Check And Adjustment Of Range Gear Shift Lever

    Tractor Manuals Scotland L4400 , WSM TRANSMISSION (3) Check and Adjustment of Range Gear Shift Lever CAUTION • Park the tractor on a firm and level ground and set the parking brake. • Lower the loader and other implement to the ground.
  • Page 218 Tractor Manuals Scotland L4400 , WSM TRANSMISSION Adjustment 1. Adjust (shorten) the turnbuckle (H) (3) so that the length (A) becomes 1 to 5 mm (0.04 to t0.2 in.). Length of the rod 85 mm Reference value 3.35 in. 2. Repeat shifting in a sequence of (H → L → H → R → H) and confirm the shifting is possible.
  • Page 219 Tractor Manuals Scotland REAR AXLE Tractor Manuals Scotland - Please Do Not Copy KiSC issued 07, 2007 A...
  • Page 220 Tractor Manuals Scotland MECHANISM CONTENTS 1. STRUCTURE ....................4-M1 Tractor Manuals Scotland - Please Do Not Copy KiSC issued 07, 2007 A...
  • Page 221 Tractor Manuals Scotland L4400 , WSM REAR AXLE 1. STRUCTURE (1) Ball Bearing (4) Differential Gear Shaft (7) Ring Gear (10) Differential Lock Shifter (2) Rear Axle (5) Brake Case (8) Differential Pinion (11) Differential Case (3) Rear Axle (6) Brake Disc...
  • Page 222 Tractor Manuals Scotland SERVICING CONTENTS 1. TROUBLESHOOTING ..................4-S1 2. TIGHTENING TORQUES ................4-S2 3. DISASSEMBLING AND SERVICING............4-S3 [1] PREPARATION ..................4-S3 [2] DISASSEMBLING REAR AXLE..............4-S6 [3] SERVICING ....................4-S7 Tractor Manuals Scotland - Please Do Not Copy KiSC issued 07, 2007 A...

  • Page 223: Troubleshooting

    Tractor Manuals Scotland L4400 , WSM REAR AXLE 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Excessive or Improper backlash between differential gear Replace 4-S5 to S6 Unusual Noise at All shaft and final gear Time Bearing worn Replace 4-S7...
  • Page 224 Tractor Manuals Scotland L4400 , WSM REAR AXLE 2. TIGHTENING TORQUES Tightening torques of screws, and nuts on the table below are especially specified. (For general use screws and nuts : See page G-9.) Item N·m kgf·m ft-lbs ROPS mounting M12, grade 7 screw 77.5 to 90.2...

  • Page 225: Disassembling And Servicing

    Tractor Manuals Scotland L4400 , WSM REAR AXLE 3. DISASSEMBLING AND SERVICING [1] PREPARATION Draining the Transmission Fluid 1. Place an oil pan underneath the transmission case. 2. Remove the drain plugs (1), (2). 3. Drain the transmission fluid. 4. Reinstall the drain plugs (1), (2).
  • Page 226 Tractor Manuals Scotland L4400 , WSM REAR AXLE Three Point Linkage and ROPS 1. Secure ROPS (1) with safety strap (2). 2. Remove stabilizer joint (3), top link (4), lift rods (5) and low links (6). 3. Unscrew ROPS mounting screws (7), then the ROPS.
  • Page 227 Tractor Manuals Scotland L4400 , WSM REAR AXLE Rear Wheel and Fender 1. Place the disassembling stand under the transmission case. 2. Loosen and remove the rear wheel mounting screws and nuts. 3. Remove the rear wheel (2). 4. Remove the rear wheel fender (1).

  • Page 228: Disassembling Rear Axle

    Tractor Manuals Scotland L4400 , WSM REAR AXLE [2] DISASSEMBLING REAR AXLE (1) Rear Axle (2) Oil Seal (3) Rear Axle Case (4) Lock Nut (5) Internal Snap Ring (6) Ball Bearing (7) Spacer (8) Gear (9) Ball Bearing W10115940 1.

  • Page 229: Servicing

    Tractor Manuals Scotland L4400 , WSM REAR AXLE [3] SERVICING 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 230 Tractor Manuals Scotland BRAKES Tractor Manuals Scotland - Please Do Not Copy KiSC issued 07, 2007 A...
  • Page 231 Tractor Manuals Scotland MECHANISM CONTENTS 1. STRUCTURE ....................5-M1 2. OPERATION ....................5-M2 Tractor Manuals Scotland - Please Do Not Copy KiSC issued 07, 2007 A...
  • Page 232 Tractor Manuals Scotland L4400 , WSM BRAKES 1. STRUCTURE (1) Brake Case (2) Brake Cam Lever (3) Parking Brake Lever (4) Brake Pedal (5) Brake Rod (6) Brake Lever Link (7) Tunbuckle W1012638 This is used hanging type brake pedals to have wider space of the platform.
  • Page 233 Tractor Manuals Scotland L4400 , WSM BRAKES 2. OPERATION (1) Cam Plate (4) Brake Case (6) Brake Shaft (Differential Gear (7) Brake Cam (2) Steel Plate (5) Steel Ball Shaft) (8) Brake Cam Lever (3) Brake Disc Tractor Manuals Scotland - Please Do Not Copy...
  • Page 234 Tractor Manuals Scotland L4400 , WSM BRAKES The brake body is incorporated in the brake case (4) filled with transmission oil and is designed to brake when the brake disc (3) splined with the differential gear shaft (6) is pressed against the cam plate (1) by means of the cam mechanism incorporating steel balls (5).
  • Page 235 Tractor Manuals Scotland 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] PREPARATION ..................5-S5 (1) Separating Rear Axle Case from Transmission Case ......5-S5 [3] DISASSEMBLING AND ASSEMBLING..........5-S8 [4] SERVICING ....................5-S9 Tractor Manuals Scotland - Please Do Not Copy KiSC issued 07, 2007 A...

  • Page 236: Troubleshooting

    Tractor Manuals Scotland L4400 , WSM BRAKES 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Uneven Braking Brake pedal play unevenly adjusted Adjust 5-S4 Force Brake disc worn Replace 5-S10 Cam plate warped Replace 5-S9 Brake Drags Too little free play in the brakes...

  • Page 237: Servicing Specifications

    Tractor Manuals Scotland L4400 , WSM BRAKES 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Brake Pedal Free Travel 15 to 20 mm – 0.6 to 0.8 in. Brake Lever Link Shaft to Bushing Clearance 0.125 to 0.195 mm 1.0 mm 0.00492 to 0.00768 in.
  • Page 238 Tractor Manuals Scotland L4400 , WSM BRAKES 3. TIGHTENING TORQUES Tightening torques of screws, and nuts on the table below are especially specified. (For general use screws, bolts and nuts : See page G-9.) Item N·m kgf·m ft-lbs ROPS mounting screw M12, greade 7 screw 77.5 to 90.2...

  • Page 239: Checking, Disassembling And Servicing

    Tractor Manuals Scotland L4400 , WSM BRAKES 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING Adjusting Brake Pedal Free Play CAUTION • Stop the engine and remove the key, then chock the wheel before checking brake pedals. 1. Release the parking brake.

  • Page 240: Preparation

    Tractor Manuals Scotland L4400 , WSM BRAKES [2] PREPARATION (1) Separating Rear Axle Case from Transmission Case Draining the Transmission Fluid 1. Place oil pans underneath the transmission case. 2. Remove the drain plugs (1), (2). 3. Drain the transmission fluid.
  • Page 241 Tractor Manuals Scotland L4400 , WSM BRAKES Three Point Linkage and ROPS 1. Secure the ROPS (1) with safety strap (2). 2. Remove stabilizer joint (3), top link (4), lift rods (5) and low links (6). 3. Unscrew ROPS mounting screws (7), then the ROPS.
  • Page 242 Tractor Manuals Scotland L4400 , WSM BRAKES Rear Wheel and Fender 1. Place the disassembling stand under the transmission case. 2. Loosen and remove the rear wheel mounting screws and nuts. 3. Remove the rear wheel (2). 4. Remove the rear wheel fender (1).

  • Page 243: Disassembling And Assembling

    Tractor Manuals Scotland L4400 , WSM BRAKES Brake Case 1. Remove the brake case mounting screws and nuts. 2. Separate the brake case, tapping the brake case lever lightly. (When reassembling) • Apply grease to the brake ball seats. (Do not grease excessively.)

  • Page 244: Servicing

    Tractor Manuals Scotland L4400 , WSM BRAKES Brake Cam and Brake Cam Lever 1. Remove the brake cam mounting nut and remove the brake cam (2) and brake cam lever (4). (When reassembling) • Apply grease to the O-ring (3) and take care not damage the O- ring.
  • Page 245 Tractor Manuals Scotland L4400 , WSM BRAKES Brake Disc Wear 1. Measure the brake disc thickness with vernier calipers. 2. If the measurement is less than the allowable limit, replace it. 4.6 to 4.8 mm Factory spec. 0.181 to 0.189 in.
  • Page 246 Tractor Manuals Scotland FRONT AXLE Tractor Manuals Scotland - Please Do Not Copy KiSC issued 07, 2007 A...
  • Page 247 Tractor Manuals Scotland MECHANISM CONTENTS 1. STRUCTURE ....................6-M1 [1] 2WD TYPE....................6-M1 [2] 4WD TYPE....................6-M2 2. FRONT WHEEL ALIGNMENT ..............6-M3 Tractor Manuals Scotland - Please Do Not Copy KiSC issued 07, 2007 A...

  • Page 248: Structure

    Tractor Manuals Scotland L4400 , WSM FRONT AXLE 1. STRUCTURE The front axle supports the front of tractor and facilitates steering. There are two kinds of front axles. The two- wheel drive axle has free-running front wheels and the four-wheel drive axle has powered front wheels.

  • Page 249: 4Wd Type

    Tractor Manuals Scotland L4400 , WSM FRONT AXLE [2] 4WD TYPE (1) Axle (7) Bevel Gear (13) Spiral Bevel Gear (19) Differential Yoke Shaft (2) Collar (8) Differential Side Gear (14) Spiral Bevel Pinion Shaft (20) Differential Case (3) Axle Flange...

  • Page 250: Front Wheel Alignment

    Tractor Manuals Scotland L4400 , WSM FRONT AXLE 2. FRONT WHEEL ALIGNMENT To assure smooth mobility or maneuverability and enhance stable and straight running, the front wheels are mounted at an angle to the right, left and forward directions. This arrangement is referred to as the Front Wheel Alignment.
  • Page 251 Tractor Manuals Scotland L4400 , WSM FRONT AXLE Toe-in Viewing the front wheels from above reveals that the distance between the toes of the front wheels is smaller than that between the heels. It is called toe-in. The front wheels tend to roll outward due to the camber, but toe-in offsets it and ensures parallel rolling of the wheels.
  • Page 252 Tractor Manuals Scotland SERVICING CONTENTS 1. TROUBLESHOOTING ..................6-S1 2. SERVICING SPECIFICATIONS ..............6-S2 3. TIGHTENING TORQUES ................6-S5 4. CHECKING, DISASSEMBLING AND SERVICING........6-S6 [1] CHECKING AND ADJUSTING ...............6-S6 [2] PREPARATION ..................6-S8 (1) Separating Front Axle Case from Front Axle Frame ......6-S8 [3] DISASSEMBLING AND ASSEMBLING..........6-S11 (1) 2WD Type Front Axle................6-S11 (2) 4WD Type Front Axle................6-S13 [4] SERVICING ....................6-S18...

  • Page 253: Troubleshooting

    Tractor Manuals Scotland L4400 , WSM FRONT AXLE 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Front Wheels Tire pressure uneven Adjust G-47 Wander to Right or Improper toe-in adjustment (improper alignment) Adjust 6-S6 Left Clearance between front axle middle boss and...

  • Page 254: Servicing Specifications

    Tractor Manuals Scotland L4400 , WSM FRONT AXLE 2. SERVICING SPECIFICATIONS 2WD TYPE Item Factory Specification Allowable Limit Front Wheel Alignment Toe-in 2 to 8 mm – 0.08 to 0.32 in. Front Wheel Axial Sway Less than 5 mm –...
  • Page 255 Tractor Manuals Scotland L4400 , WSM FRONT AXLE 4WD TYPE Item Factory Specification Allowable Limit Front Wheel Alignment Toe-in 2 to 8 mm – 0.08 to 0.32 in. Front Wheel Steering Angle 0.925 to 0.960 rad. – 53 to 55 °...
  • Page 256 Tractor Manuals Scotland L4400 , WSM FRONT AXLE 4WD TYPE (Continued) Item Factory Specification Allowable Limit Spiral Bevel Pinion Shaft to Spiral Bevel Backlash 0.1 to 0.3 mm – Gear 0.004 to 0.012 in. Bevel Gear to Bevel Gear Backlash 0.15 to 0.35 mm...
  • Page 257 Tractor Manuals Scotland L4400 , 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-9.) 2WD TYPE Item N·m kgf·m...

  • Page 258: Checking, Disassembling And Servicing

    Tractor Manuals Scotland L4400 , WSM FRONT AXLE 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING Toe-in 1. Park the tractor on flat ground. 2. Inflate the tires to the specified pressure. 3. Turn steering wheel so front wheels are in the straight ahead position.
  • Page 259 Tractor Manuals Scotland L4400 , WSM FRONT AXLE Axial Sway of Front Wheel 1. Jack up the front side of tractor. 2. Set a dial gauge on the outside of rim. 3. Turn the wheel slowly and read the runout of rim.

  • Page 260: Preparation

    Capacity Front axle case oil 6.9 U.S.qts 5.7 Imp.qts IMPORTANT • Use KUBOTA SUPER UDT fluid or SAE 80, 90 gear oil. Refer to "LUBRICANTS, FUEL AND COOLANT". (See page G-8.) (1) Check Plug (3) Drain Plug (2) Filling Port Plug...
  • Page 261 Tractor Manuals Scotland L4400 , WSM FRONT AXLE Propeller Shaft (4WD only) 1. Slide propeller shaft front cover (1) and rear cover (2) after removing screws (3). 2. Tap out spring pins (4), (5), slide couplings (6), (7), and then remove propeller shaft together with propeller shaft covers.
  • Page 262 Tractor Manuals Scotland L4400 , WSM FRONT AXLE Front Wheel and Front Axle Assemblt 1. Check the front axle and engine are securely mounted on the disassembly stand. 2. Loosen the front wheel mounting nuts. 3. Lift the front axle and remove the front wheels.

  • Page 263: Disassembling And Assembling

    Tractor Manuals Scotland L4400 , WSM FRONT AXLE [3] DISASSEMBLING AND ASSEMBLING (1) 2WD Type Front Axle Front Wheel Hub 1. Remove the front wheels. 2. Remove the cotter pin and remove the slotted nut (2). 3. Disconnect the knuckle arm (1) and tie-rod end (3).
  • Page 264 Tractor Manuals Scotland L4400 , WSM FRONT AXLE Knuckle Shaft and Front Axle, Out 1. Remove the knuckle arm (1) and draw out the knuckle shaft (4) from the front axle. 2. Remove the front axle, out (3). (When reassembling) •...

  • Page 265: 4Wd Type Front Axle

    Tractor Manuals Scotland L4400 , WSM FRONT AXLE (2) 4WD Type Front Axle Tie-rods 1. Pull out the cotter pin and remove the tie-rod end slotted nuts. 2. Remove the tie-rod with a tie-rod end lifter (Code No. 07909- 39051).
  • Page 266 Tractor Manuals Scotland L4400 , WSM FRONT AXLE Bevel Gear and Bevel Gear Shaft 1. Remove the plug (5). 2. Remove the internal snap ring (4) and shim (3). 3. Tap out the bevel gear (2) with ball bearing. 4. Draw out the bevel gear shaft (1).
  • Page 267 Tractor Manuals Scotland L4400 , WSM FRONT AXLE Axle 1. Remove the bearing with a special use puller set (Code No. 07916-09032). 2. Take out the bevel gear (2). 3. Take out the collar (1). 4. Tap out the axle (3).
  • Page 268 Tractor Manuals Scotland L4400 , WSM FRONT AXLE Spiral Bevel Pinion Shaft and Differential Gear Assembly 1. Take out the differential yoke shaft (9), (10) both sides. 2. Remove the oil seal (6) and internal snap ring (5). 3. Remove the collar (4).
  • Page 269 Tractor Manuals Scotland L4400 , WSM FRONT AXLE Differential Gear 1. Remove the differential case cover mounting screws (9) and then take out the differential case cover (5), ball bearing (6) and spiral bevel gear (7) as a unit. 2. Remove the external snap ring (8), and then remove the ball bearing (6) and spiral bevel gear (7) as a unit with a puller.

  • Page 270: Servicing

    Tractor Manuals Scotland L4400 , WSM FRONT AXLE [4] SERVICING (1) 2WD Type Clearance between Front Axle Middle Boss and Shaft Brancket Bushing 1. Measure the front axle middle boss O.D. at several points where it contacts with the bushing.

  • Page 271: 4Wd Type

    Tractor Manuals Scotland L4400 , WSM FRONT AXLE (2) 4WD Type Clearance between Differential Case (Differential Case Cover) and Differential Side Gear 1. Measure the differential side gear O.D.. 2. Measure the differential case bore I.D. and calculate the clearance.
  • Page 272 Tractor Manuals Scotland L4400 , WSM FRONT AXLE Backlash between Differential Pinon and Differential Side Gear 1. Set a dial gauge (lever type) on a tooth of the differential pinion. 2. Fix the differential side gear and move the differential pinion to measure the backlash.
  • Page 273 Tractor Manuals Scotland L4400 , WSM FRONT AXLE Backlash between Spiral Bevel Pinion Shaft and Spiral Bevel Gear 1. Set a dial gauge (lever type) with its finger on the spline of spiral bevel pinion shaft. 2. Measure the backlash by moving the spiral bevel pinion shaft by hand lightly.
  • Page 274 Tractor Manuals Scotland L4400 , WSM FRONT AXLE Backlash between 11T Bevel Gear and 42T Bevel Gear 1. Place a strip of fuse to three spots on the 42T bevel gear (1) with grease. 2. Fix the axle flange and front gear case.
  • Page 275 Tractor Manuals Scotland L4400 , WSM FRONT AXLE Clearance between Front Axle Case Bosses and Bracket Bushings 1. Measure the front axle case bosses O.D. with an outside micrometer. 2. Measure the bracket bushing I.D. and calculate the clearance. 3. If the clearance exceeds the allowable limit, replace the bracket bushing.
  • Page 276 Tractor Manuals Scotland STEERING Tractor Manuals Scotland - Please Do Not Copy KiSC issued 07, 2007 A...
  • Page 277 Tractor Manuals Scotland MECHANISM CONTENTS 1. STRUCTURE ....................7-M1 [1] LINKAGE....................7-M1 [2] HYDRAULIC CIRCUIT................7-M2 [3] HYDRAULIC PUMP ................7-M3 [4] STEERING CONTROLLER ..............7-M4 (1) Control Valve ..................7-M5 (2) Metering Device (Gerotor) ..............7-M5 (3) Relief Valve (with Check Valve) ............7-M6 (4) Oil Flow ....................

  • Page 278: Structure

    Tractor Manuals Scotland L4400 , WSM STEERING 1. STRUCTURE [1] LINKAGE (1) Steering Wheel (3) Steering Shaft 2 (5) Steering Controller (7) Steering Cylinder (2) Steering Shaft 1 (4) Joint Shaft 2 (6) Hydraulic Pump Full hydrostatic type power steering is used on this tractor. The steering system is composed of steering wheel, steering controller, steering cylinder and other components shown in the figure.

  • Page 279: Hydraulic Circuit

    Tractor Manuals Scotland L4400 , WSM STEERING [2] HYDRAULIC CIRCUIT When the engine starts, the hydraulic pump (8) pressure-feeds the oil, drawn from the transmission case (7) through the oil filter (6), to the steering controller (3). The oil which has entered steering controller (3) is directed to control valve (10).

  • Page 280: Hydraulic Pump

    Tractor Manuals Scotland L4400 , WSM STEERING [3] HYDRAULIC PUMP The gear type hydraulic pump is adopted for this tractor. This pump is tandem type and it is composed two pair of gears, side plates, bushings and other components as shown in the figure.

  • Page 281: Steering Controller

    Tractor Manuals Scotland L4400 , WSM STEERING [4] STEERING CONTROLLER (1) Port Cover (4) Drive Plate (6) Valve Plate (8) Stator (2) Hex. Drive Assembly (5) Relief Valve (7) Drive Link (9) Upper Cover (3) Rotor The steering controller mainly consists of a control valve, a metering device and a relief valve with check valve.

  • Page 282: Control Valve

    Tractor Manuals Scotland L4400 , WSM STEERING (1) Control Valve The control valve is a rotary plate type valve. When the steering wheel is not turned, the position of the valve plate (5) and the manifolds (1), (3) is kept neutral by the centering springs (2).

  • Page 283: Relief Valve (With Check Valve)

    Tractor Manuals Scotland L4400 , WSM STEERING (3) Relief Valve (with Check Valve) If the pressure in the hydraulic circuit rises above the set pressure of the relief valve, the relief valve will actuate to prevent the pressure from rising further and protect the hydraulic system.

  • Page 284: Oil Flow

    Tractor Manuals Scotland L4400 , WSM STEERING (4) Oil Flow Neutral Position When the steering wheel (1) is not being turned, valve plate (2) is held in the neutral position by centering spring. Under this condition, an oil passage is formed...
  • Page 285 Tractor Manuals Scotland L4400 , WSM STEERING Right Turn When the steering wheel is turned to the right, the action is transmitted through the drive plate, gerotor, and drive link to the control valve. Valve plate (2) then rotates to the right on manifolds, located on the opposite faces of the valve plate (2).
  • Page 286 Tractor Manuals Scotland L4400 , WSM STEERING Left Turn The steering system operates in the same way at a left-turn as well, except that oil flows into and out of steering cylinder in the directions opposite to those at a right-turn.

  • Page 287: Steering Cylinder

    Tractor Manuals Scotland L4400 , WSM STEERING [5] STEERING CYLINDER (1) Tie-rod (3) Head Cover (5) Head Cover (7) Internal Snap Ring (2) Piston Rod (4) Cylinder Tube (6) Front Axle Case The steering cylinder is a single piston both rod double-acting type. This steering cylinder is installed parallel to the front axle and connected to tie-rods.
  • Page 288 Tractor Manuals Scotland 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 ....................7-S5 (1) Hydraulic Pump Test Using Flow-meter (Power Steering) ....7-S5 (2) Relief Valve (Power Steering) .............7-S7 [2] DISASSEMBLING AND ASSEMBLING..........7-S8 (1) Hydraulic Pump (Power Steering, Three Point System) .....7-S8 (2) Steering Post and Steering Controller ..........7-S10 (3) Steering Cylinder (2WD) ..............7-S12...

  • Page 289: Troubleshooting

    Tractor Manuals Scotland L4400 , WSM STEERING 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Tractor Can Not Be Steering controller broken Replace 7-S10, S11 Steered Pipe broken Replace – Front Wheels Improper toe-in adjustment Adjust 6-S6 Vibration Air in the hydraulic system...

  • Page 290: Servicing Specifications

    Tractor Manuals Scotland L4400 , WSM STEERING 2. SERVICING SPECIFICATIONS HYDRAULIC PUMP Item Factory Specification Allowable Limit Hydraulic Pump Delivery at No Above – Condition Pressure 17.9 L/min Engine Speed : 4.73 U.S.gals./min Approx. 2800 min (rpm) 3.94 Imp.gals./min (Except L4330) Approx.
  • Page 291 Tractor Manuals Scotland L4400 , WSM STEERING STEERING CYLINDER Item Factory Specification Allowable Limit Steering Cylinder I.D. 50.000 to 50.062 mm 50.100 mm (2WD) 1.96850 to 1.97094 in. 1.97244 in. I.D. 55.000 to 55.074 mm 55.100 mm (4WD) 2.16535 to 2.16827 in.
  • Page 292 Tractor Manuals Scotland L4400 , 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-9.) Item N·m kgf·m ft-lbs Regulator valve delivery pipe joint bolt 39.2 to 49.0...

  • Page 293: Checking, Disassembling And Servicing

    Tractor Manuals Scotland L4400 , WSM STEERING 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING (1) Hydraulic Pump Test Using Flow-meter (Power Steering) Preparation 1. Remove side cover RH (1). 2. Remove the power steering main delivery hose (2). (When reassembling) •...
  • Page 294 STEERING Hydraulic Flow Test (Power Steering) IMPORTANT • When using a flowmeter which is not specified by KUBOTA, be sure to follow the instructions for that flowmeter. • Since the flowmeter has no relief valve, do not close the flowmeter loading valve completely before testing.

  • Page 295: Relief Valve (Power Steering)

    Tractor Manuals Scotland L4400 , WSM STEERING (2) Relief Valve (Power Steering) Relief Valve Setting Pressure 1. Disconnect the power steering delivery pipe joint bolt. 2. Install the adaptor E and adaptor 58 of relief valve setting pressure tester to the regulator valve, and then set a thread joint, cable and pressure gauge.

  • Page 296: Disassembling And Assembling

    Tractor Manuals Scotland L4400 , WSM STEERING [2] DISASSEMBLING AND ASSEMBLING (1) Hydraulic Pump (Power Steering, Three Point System) Preparation 1. Remove the side cover RH (11). 2. Disconnect the independent PTO delivery pipe (5), power steering delivery hose (4) and power steering return hose (3) from the regulator valve (2).
  • Page 297 Tractor Manuals Scotland L4400 , WSM STEERING Hydraulic Pump Assembly 1. Remove the pump cover mounting screw (7). 2. Remove the drive gear (6), driven gear (2) and side plate (3) from the casing. (When reassembling) • Take care no to damage the gasket.

  • Page 298: Steering Post And Steering Controller

    Tractor Manuals Scotland L4400 , WSM STEERING (2) Steering Post and Steering Controller IMPORTANT • Use only the transmission fluid (See page G-8), in no case use mixture of oils of different brands. • Before disassembling the power steering system hydraulic components, check the performance of hydraulic pump and power steering using a flowmeter.
  • Page 299 Tractor Manuals Scotland L4400 , WSM STEERING Steering Post Assembly Remove steering post assembly mounting screws (2) and then remove steering post assembly. (1) Steering Post Assembly (3) Steering Controller (2) Steering Post Assembly mounting screw W1017573 Hydraulic Hoses 1. Disconnect main delivery hose (1), return hose (2), right delivery hose (3) and left delivery hose (4).

  • Page 300: Steering Cylinder (2Wd)

    Tractor Manuals Scotland L4400 , WSM STEERING (3) Steering Cylinder (2WD) Front Wheel, Cylinder Cover and Tie-rod 1. Place a disassembly stand under the front axle frame (4) and support it with a jack. 2. Remove the front wheel and cylinder cover (3).
  • Page 301 Tractor Manuals Scotland L4400 , WSM STEERING Steering Cylinder 1. Disconnect the power steering hoses (1). 2. Remove the cylinder clamps (2). 3. Take out the steering cylinder (3). 4. Remove the tie-rod joints (4). 5. Carefully clamp the steering cylinder in a vise.

  • Page 302: Steering Cylinder (4Wd)

    Tractor Manuals Scotland L4400 , WSM STEERING (4) Steering Cylinder (4WD) Front Wheel, Cylinder COver and Tie-rod 1. Place a disassembly stand under the engine and support it with a jack. 2. Remove the front wheel and cylinder cover (2).

  • Page 303: Servicing

    Tractor Manuals Scotland L4400 , WSM STEERING [3] SERVICING (1) Hydraulic Pump (Power Steering Housing Bore (Depth of Scratch) 1. Check for the scratch on the interior surface of the housing caused by the gear. 2. If the scratch reaches more than half the area of the interior surface of the housing, replace at pump assembly.

  • Page 304: Steering Cylinder

    Tractor Manuals Scotland L4400 , WSM STEERING (2) Steering Cylinder Steering Cylinder I.D. 1. Measure the steering cylinder I.D. with a cylinder gauge. 2. If the cylinder I.D. exceed the allowable limit, replace the cylinder tube. 50.000 to 50.062 mm 1.96850 to 1.97094 in.
  • Page 305 Tractor Manuals Scotland HYDRAULIC SYSTEM Tractor Manuals Scotland - Please Do Not Copy KiSC issued 07, 2007 A...
  • Page 306 Tractor Manuals Scotland MECHANISM CONTENTS 1. HYDRAULIC CIRCUIT .................. 8-M1 2. POSITION CONTROL VALVE ..............8-M2 3. HYDRAULIC CIRCUIT FOR THREE POINT HYDRAULIC SYSTEM..8-M3 4. HYDRAULIC CYLINDER ................8-M4 5. LINKAGE MECHANISM................8-M5 [1] POSITION CONTROL ................8-M5 [2] POSITION CONTROL WITH DRAFT OPERATION (IF EQUIPPED) 8-M7 [3] MIXED CONTROL ..................

  • Page 307: Hydraulic Circuit

    Tractor Manuals Scotland L4400 , WSM HYDRAULIC SYSTEM 1. HYDRAULIC CIRCUIT (1) Front Hydraulic Block (4) Auxiliary Control Valve (6) Power Steering Controller (8) Oil Filter (2) Hydraulic Cylinder Block (Option) (Refer to STEERING Section) (9) Cylinder Safety Valve (3) Position Control Valve...

  • Page 308: Position Control Valve

    Tractor Manuals Scotland L4400 , WSM HYDRAULIC SYSTEM 2. POSITION CONTROL VALVE (1) Three Point System Hydraulic (4) Position Control Valve (7) Quick Coupler (If Equipped) A : Delivery Lines Pump (5) Hydraulic Cylinder (8) Oil Tank (Transmission Case) B : Suction or Drain Lines...

  • Page 309: Hydraulic Circuit For Three Point Hydraulic System

    Tractor Manuals Scotland L4400 , WSM HYDRAULIC SYSTEM 3. HYDRAULIC CIRCUIT FOR THREE POINT HYDRAULIC SYSTEM (1) Oil Tank (Transmission Case) (2) Hydraulic Oil Filter Cartridge (3) Engine (4) Three Point System Hydraulic Pump (5) Relief Valve (6) Front Hydraulic Block...

  • Page 310: Hydraulic Cylinder

    Tractor Manuals Scotland L4400 , WSM HYDRAULIC SYSTEM 4. HYDRAULIC CYLINDER (1) Lowering Speed Adjusting (4) Hydraulic Cylinder (8) Hydraulic Rod (12) Position Control Arm Knob (5) O-ring (9) Hydraulic Arm (13) Spool Drive Lever (2) Lowering Speed Adjusting (6) Back-up Ring...

  • Page 311: Linkage Mechanism

    Tractor Manuals Scotland L4400 , WSM HYDRAULIC SYSTEM 5. LINKAGE MECHANISM [1] POSITION CONTROL (1) Position Control Lever (2) Control Arm (3) Spool Drive Lever (4) Spool Joint 1 (5) Spool Head (6) Valve Body (7) Feedback Lever Shaft (8) Feedback Lever...
  • Page 312 Tractor Manuals Scotland L4400 , WSM HYDRAULIC SYSTEM Lifting 1. When the position control lever is moved to the LIFT position, the control arm (2) rotates to the arrow. Therefore, the spool drive lever (1) moves around the fulcrum P and pull the spool (3) opening the LIFT circuit.

  • Page 313: Position Control With Draft Operation (If Equipped) 8-M7

    Tractor Manuals Scotland L4400 , WSM HYDRAULIC SYSTEM [2] POSITION CONTROL WITH DRAFT OPERATION (IF EQUIPPED) Draft control is a system which maintains a constant traction load, and is suited for the work which needs heavy traction load such as plowing.
  • Page 314 Tractor Manuals Scotland L4400 , WSM HYDRAULIC SYSTEM (1) Lift Arm (2) Hydraulic Arm Shaft (3) Feedback Rod Stay (4) Feedback Rod (5) Draft Cam (6) Draft Control Lever Shaft (7) Position Control Link (8) Position Control Lever (9) Draft Control Lever...

  • Page 315: Mixed Control

    Tractor Manuals Scotland L4400 , WSM HYDRAULIC SYSTEM [3] MIXED CONTROL Mixed control is a system combining position control with draft control. When traction load increases, the draft control functions to raise the lift arms (implement). When traction load decreases, the lift arms (implement) lower to the height set by the position control lever.

  • Page 316: Front Hydraulic Block

    Tractor Manuals Scotland L4400 , WSM HYDRAULIC SYSTEM 6. FRONT HYDRAULIC BLOCK (1) Cap A : To Implement Control Valve C : To Position Control Valve : To Transmission Case (2) Front Hydraulic Block B : From Implement Control P : From Hydraulic Valve...
  • Page 317 Tractor Manuals Scotland SERVICING CONTENTS 1. TROUBLESHOOTING ..................8-S1 2. SERVICING SPECIFICATIONS ..............8-S3 3. TIGHTENING TORQUES ................8-S6 4. CHECKING, DISASSEMBLING AND SERVICING........8-S7 [1] CHECKING, DISASSEMBLING AND ASSEMBLING......8-S7 (1) Hydraulic Pump Test Using Flow-meter (Power Steering) ....8-S7 (2) Relief Valve (Power Steering) .............8-S9 (3) Hydraulic Pump Test Using Flow-meter (Three Point Hydraulic System) ....................8-S9 (4) Relief Valve (Three Point Hydraulic System) ........8-S11...
  • Page 318 Tractor Manuals Scotland L4400 , WSM HYDRAULIC SYSTEM 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Implement Does Not Control linkage improperly adjusted Adjust 8-S11, S13 Rise (Without Noise) Control linkage improperly assembled or Repair or replace 8-S12, S20, damaged...
  • Page 319 Tractor Manuals Scotland L4400 , WSM HYDRAULIC SYSTEM Reference Symptom Probable Cause Solution Page Implement Hunts Poppet 1 seat surface damaged (control valve) Replace 8-S20, S21 (Moves Up and Poppet 1 O-ring damaged (control valve) Replace 8-S20, S21 Down) Poppet 2 seat surface damaged (control valve)

  • Page 320: Servicing Specifications

    Tractor Manuals Scotland L4400 , WSM HYDRAULIC SYSTEM 2. SERVICING SPECIFICATIONS POWER STEERING HYDRAULIC PUMP Item Factory Specification Allowable Limit Hydraulic Pump Delivery at No Above – Condition Pressure 17.9 L/min. • Engine speed : 4.73 U.S.gals/min. Approx. 2600 min (rpm) 3.94 Imp.gals/min.
  • Page 321 Tractor Manuals Scotland L4400 , WSM HYDRAULIC SYSTEM THREE POINT SYSTEM HYDRAULIC PUMP Item Factory Specification Allowable Limit Hydraulic Pump Delivery at No Above – Condition Pressure 29.4 L/min. • Engine speed : 7.77 U.S.gals./min. Approx. 2600 min (rpm) 6.47 Imp.gals./min.
  • Page 322 Tractor Manuals Scotland L4400 , WSM HYDRAULIC SYSTEM CONTROL LINKAGE Lift Arm Free Play 10 to 15 mm – (at Maximum 0.39 to 0.58 in. Raising Position) W1013874 HYDRAULIC CYLINDER Item Factory Specification Allowable Limit Cylinder Bore I.D. 90.000 to 90.050 mm 90.150 mm...
  • Page 323 Tractor Manuals Scotland L4400 , 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-9.) Item N·m kgf·m ft-lbs Relief valve plug 49.0 to 68.6...

  • Page 324: Checking, Disassembling And Servicing

    Tractor Manuals Scotland L4400 , WSM HYDRAULIC SYSTEM 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING, DISASSEMBLING AND ASSEMBLING (1) Hydraulic Pump Test Using Flow-meter (Power Steering) Preparation 1. Remove side cover RH (1). 2. Remove the power steering main delivery hose (2).
  • Page 325 HYDRAULIC SYSTEM Hydraulic Flow Test (Power Steering) IMPORTANT • When using a flowmeter which is not specified by KUBOTA, be sure to follow the instructions for that flowmeter. • Since the flowmeter has no relief valve, do not close the flowmeter loading valve completely before testing.

  • Page 326: Relief Valve (Power Steering)

    Tractor Manuals Scotland L4400 , WSM HYDRAULIC SYSTEM (2) Relief Valve (Power Steering) Relief Valve Setting Pressure 1. Disconnect the power steering delivery pipe joint bolt. 2. Install the adaptor E and adaptor 58 of relief valve setting pressure tester to the regulator valve, and then set a thread joint, cable and pressure gauge.
  • Page 327 HYDRAULIC SYSTEM Hydraulic Flow Test (3P Hydraulic System) IMPORTANT • When using a flowmeter which is not specified by KUBOTA, be sure to flow the instructions for that flowmeter. • Since the flowmeter has no relief valve, do not close the flowmeter loading valve completely before testing.

  • Page 328: Relief Valve (Three Point Hydraulic System)

    Tractor Manuals Scotland L4400 , WSM HYDRAULIC SYSTEM (4) Relief Valve (Three Point Hydraulic System) Relief Valve Setting Pressure 1. Remove the delivery pipe joint bolt from front hydraulic block. 2. Install the adaptor E. Then connect the hose and pressure gauge to adaptor E.
  • Page 329 Tractor Manuals Scotland L4400 , WSM HYDRAULIC SYSTEM Position Control Feedback Rod Adjustment 1. Set the position control lever (1) (the draft control lever (2), if equipped) to the lowest position. 2. Start the engine and set the engine at idling speed (allow the engine to warm up for approx.
  • Page 330 Tractor Manuals Scotland L4400 , WSM HYDRAULIC SYSTEM Adjusting Draft Control Rod (If Equipped) 1. Set the draft control lever (1) to the lowest position. 2. Adjust the position control feedback rod. (Refer to "Adjusting Position Control Feedback Rod" See page 8-S12).

  • Page 331: Disassembling And Assembling

    Tractor Manuals Scotland L4400 , WSM HYDRAULIC SYSTEM [2] DISASSEMBLING AND ASSEMBLING (1) Hydraulic Pump (Power Steering, Three Point Hydraulic System) Preparation 1. Remove the side cover RH (11). 2. Disconnect the independent PTO delivery pipe (5), power steering delivery hose (4) and power steering return hose (3) from the regulator valve (2).
  • Page 332 Tractor Manuals Scotland L4400 , WSM HYDRAULIC SYSTEM Hydraulic Pump Assembly 1. Remove the pump cover mounting screw (7). 2. Remove the drive gear (6), driven gear (2) and side plate (3) from the casing. (When reassembling) • Take care no to damage the gasket.

  • Page 333: Hydraulic Cylinder

    Tractor Manuals Scotland L4400 , WSM HYDRAULIC SYSTEM (2) Hydraulic Cylinder Preparation 1. Remove lift-rods (1), top link (2) and rear wheels. 2. Remove seat (3). 3. Remove step cover (4). 4. Remove upper part of position control lever (5).
  • Page 334 Tractor Manuals Scotland L4400 , WSM HYDRAULIC SYSTEM Hydraulic Cylinder 1. Loosen and remove the hydraulic cylinder assembly mounting screws and nuts. 2. Support the hydraulic cylinder assembly with nylon lift strap and hoist, and then take out it. (When reassembling) •...
  • Page 335 Tractor Manuals Scotland L4400 , WSM HYDRAULIC SYSTEM Hydraulic Rod and Hydraulic Piston 1. Tap out the spring pin. 2. Remove the hydraulic rod. 3. Remove the plug (screw head size: 17 mm) from front of hydraulic cylinder. 4. Inject the compressed air through the plug hole, and take out the hydraulic piston.
  • Page 336 Tractor Manuals Scotland L4400 , WSM HYDRAULIC SYSTEM Lift Arm, Hydraulic Arm and Hydraulic Arm Shaft 1. Disconnect the feedback rod from feedback lever. 2. Remove the lift arm setting screws. 3. Remove the lift arm LH (4). 4. Draw out the hydraulic arm shaft (5) and lift arm RH (6) as a unit.

  • Page 337: Position Control Valve

    Tractor Manuals Scotland L4400 , WSM HYDRAULIC SYSTEM (3) Position Control Valve Position Control Valve 1. Loosen and remove the position control valve mounting screws. 2. Take out the position control valve (1). (When reassembling) • Take care not to damage the O-rings.

  • Page 338: Relief Vave

    Tractor Manuals Scotland L4400 , WSM HYDRAULIC SYSTEM IMPORTANT • Set screw (3) and spool joint 1 (2) are adjusted to very close accuracy. Do not disassemble them unless necessary. If disassembled due to unavoidable reasons, be sure to make the following adjustments before assembling.

  • Page 339: Cylinder Safety Valve

    Tractor Manuals Scotland L4400 , WSM HYDRAULIC SYSTEM (5) Cylinder Safety Valve Cylinder Safety Valve 1. Remove the cylinder safety valve assembly (7). 2. Secure the cylinder safety valve assembly with a vise. 3. Loosen the lock nut (2), and remove the adjust screw (1).

  • Page 340: Hydraulic Pump (Power Steering, Three Point System)

    Tractor Manuals Scotland L4400 , WSM HYDRAULIC SYSTEM 1. Disconnect the draft control rod (18) from the top link bracket (21). 2. Remove the position control lever (6) and draft control lever (7). 3. Disconnect the draft control feedback rod (2) from the draft control link 2 (12).

  • Page 341: Hydraulic Cylinder

    Tractor Manuals Scotland L4400 , WSM HYDRAULIC SYSTEM Clearance between Bushing and Gear Shaft 1. Measure the gear shaft O.D. with and outside micrometer. 2. Measure the bushing I.D. with an inside micrometer or cylinder gauge, and calculate the clearance.

  • Page 342: Cylinder Safety Valve

    Tractor Manuals Scotland L4400 , WSM HYDRAULIC SYSTEM Clearance between Hydraulic Arm Shaft and Bushing 1. Measure the hydraulic arm shaft O.D. with an outside micrometer. 2. Measurement the bushing I.D. with an inside micrometer, and calculate the clearance. 3. If the clearance exceeds the allowable limit, replace the bushing.
  • Page 343 Tractor Manuals Scotland ELECTRICAL SYSTEM Tractor Manuals Scotland - Please Do Not Copy KiSC issued 07, 2007 A...
  • Page 344 Tractor Manuals Scotland MECHANISM CONTENTS 1. WIRING DIAGRAM ..................9-M1 2. OPERATOR PRESENCE CONTROL............9-M3 [1] ELECTRIC CIRCUIT................9-M3 [2] SEAT SWITCH AND OPC TIMER ............9-M8 Tractor Manuals Scotland - Please Do Not Copy KiSC issued 07, 2007 A...

  • Page 345: Wiring Diagram

    Tractor Manuals Scotland L4400, WSM ELECTRICAL SYSTEM 1. WIRING DIAGRAM Key Stop Solenoid Relay Key Stop Head Light Solenoid Starter Relay Hazard Unit Fuel Tank Glow Lamp OPC Timer Coolant Temperature Sensor Earth Fuse Box Fuse Oil Switch 0.85 L 0.85 W...
  • Page 346 Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM Color of Wiring B ... Black L/R ..Blue / Red R/W .... Red / White B/L ..Black / Blue L/W ..Blue / White R/Y ..... Red / Yellow B/R ..Black / Red L/Y ..

  • Page 347: Operator Presence Control

    Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM 2. OPERATOR PRESENCE CONTROL This is tractor is equipped with Operator Presence Control (OPC) system which automatically stops the engine when operator gets up from the seat while shifting the PTO lever (PTO clutch control lever) or the range gear shift lever (Lo-R, Hi).
  • Page 348 Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM Engine Stops (Case 1) When operator gets up from the seat while placing the PTO lever in "OFF" position and the range gear shift lever in "Low" or "Reverse" or “High” position, the current flow is shown in Figure below.
  • Page 349 Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM Engine Stops (Case 2) When operator gets up from the seat while placing the PTO lever in "ON" position and the range gear shift lever (Lo-R, Hi) in "Neutral" position. The current flow is shown in Figure below.
  • Page 350 Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM Engine Does Not Stop (Case 1) When operator gets up from the seat while placing the PTO lever in "OFF" position and the range gear shift lever (Lo-R, Hi) in "Neutral" position. The current flow is shown in Figure below.
  • Page 351 Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM Engine Does Not Stop (Case 2) When operator gets off the tractor and then tilts the operator's seat forward (The PTO lever in "ON" position and the range gear shift lever (Lo-R, Hi) in "Neutral" position). The current flow is shown in Figure below.

  • Page 352: Seat Switch And Opc Timer

    Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM [2] SEAT SWITCH AND OPC TIMER The seat switch (3) has three positions. One is "ON" when operator sits on the seat, "OFF" when operator gets up from the seat and "ON" again when the seat is tilted forward.
  • Page 353 Tractor Manuals Scotland SERVICING CONTENTS 1. TROUBLESHOOTING ..................9-S1 2. SERVICING SPECIFICATIONS ..............9-S6 3. TIGHTENING TORQUES ................9-S7 4. CHECKING, DISASSEMBLING AND SERVICING........9-S8 [1] CHECKING AND ADJUSTING ...............9-S8 (1) Battery....................9-S8 (2) Main Switch..................9-S10 (3) Safety Switch ..................9-S12 (4) Operator Presence Control ...............9-S13 (5) Starter and Starter Relay ..............9-S15 (6) Glow Control System ................9-S16 (7) Engine Stop Solenoid ...............9-S17...
  • Page 354 Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page All Electrical Battery discharged or defective Recharge or replace 9-S8 Equipments Do Not Battery positive cable disconnected or Repair or replace 9-S8 Operate improperly connected...
  • Page 355 Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM STARTING SYSTEM Reference Symptom Probable Cause Solution Page Starter Motor Does Battery discharged or defective Recharge or replace 9-S8 Not Operate Slow blow fuse blown Replace G-32 Safety switch defective Replace 9-S12...
  • Page 356 Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM CHARGING SYSTEM Reference Symptom Probable Cause Solution Page Charging Lamp Does Fuse blown (10 A) Replace G-32 Not Light When Main Wiring harness disconnected or improperly Repair or replace – Switch is Turned ON...
  • Page 357 Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM LIGHTING SYSTEM Reference Symptom Probable Cause Solution Page Headlight Does Not Fuse blown (15 A) Replace G-32 Light Bulb blown Replace G-32 Wiring harness disconnected or improperly Repair or replace – connected (between main switch AC terminal...
  • Page 358 Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM EASY CHECKER Reference Symptom Probable Cause Solution Page Engine Oil Pressure Engine oil pressure too low Repair engine 1-S15 Lamp Lights Up Engine oil insufficient Replenish G-13 When Engine is Engine oil pressure switch defective Replace –...

  • Page 359: Servicing Specifications

    Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM 2. SERVICING SPECIFICATIONS STARTER MOTOR Item Factory Specification Allowable Limit Commutator O.D. 30.0 mm 29.0 mm 1.181 in. 1.142 in. Mica Undercut 0.50 to 0.80 mm 0.2 mm 0.020 to 0.031 in.
  • Page 360 Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts : See page G-9..) Item N·m kgf·m ft-lbs Alternator pulley nut 58.3 to 78.9...

  • Page 361: Checking, Disassembling And Servicing

    Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM 4. 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.
  • Page 362 Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM Batterry 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 363: Main Switch

    Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM (2) Main Switch Connector Voltage 1. Measure the voltage with a voltmeter across the connector B terminal and chassis. 2. If the voltage differs from the battery voltage (11 to 14 V), the wiring harness is faulty.
  • Page 364 Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM Main Switch Key at PREHEAT Position 1. Turn and hold the main switch key at the PREHEAT position. 2. Measure the resistance with an ohmmeter across the terminal 3 and the terminal 2, and across the terminal 3 and the terminal 6.

  • Page 365: Safety Switch

    Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM (3) Safety Switch Safety Switch Continuity 1. Disconnect PTO lever safety switch connectors (3) and range gear shift lever safety switch connectors (6). 2. Connect the circuit tester to each safety switch's terminals.

  • Page 366: Operator Presence Control

    Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM (4) Operator Presence Control Preparation before checking 1. Sit on operator's seat. 2. Set the parking brake. 3. Shift the main gear shift lever and the range gear shift lever (Lo-R, Hi) to "NEUTRAL" position.
  • Page 367 Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM Checking Seat Switch 1. Remove the seat. 2. Disconnect the seat switch connector (3). 3. Change the sensor bar angle (1) and measure the resistance between connector terminals, referring to the table below.

  • Page 368: Starter And Starter Relay

    Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM (5) Starter and Starter Relay Starter Motor B Terminal Voltage 1. Measure the voltage across the B terminal and chassis. 2. If the voltage differs from the battery voltage, check the battery's cable.

  • Page 369: Glow Control System

    Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM Starter Relay 1. Open the panel board and remove the starter relay. 2. Apply battery voltage between terminal 2 and 4, and check for continuity between terminal 1 and 3. 3. If 0 ohm is not indicated, renew the starter relay.

  • Page 370: Engine Stop Solenoid

    Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM (7) Engine Stop Solenoid Connector Voltage 1. Disconnect the 2P connector from engine stop solenoid. 2. Turn the main switch key to the "ON" position. 3. Measure the voltage between the terminal 1, terminal 2 and body.

  • Page 371: Charging System

    Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM Glow Relay (Key Stop Solenoid Relay) 1. Turn the main switch off. 2. Disconnect the 4P connector from glow relay (1). 3. Measure the voltage across the terminal 3 (Positive) and chassis (Negative).
  • Page 372 Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM Connector Voltage 1. Turn the main switch OFF. Measure the voltage between the B terminal (1) and the chassis. 2. Turn the main switch ON. Measure the voltage between the IG terminal (3) and the chassis.

  • Page 373: Combination Switch

    Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM (9) Combination Switch 1. Turn off the main switch (1). 2. Remove the panel board (2). 3. Perform the following checkings. (1) Main Switch (3) Combination Switch (2) Panel Board W1107080 Connector Voltage (Wire Harness Side) 1.
  • Page 374 Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM Head LIght Switch Continuity when Setting Switch at ON1 Position 1. Measure the resistance with an ohmmeter across the B1 terminal to the T terminal and the B1 terminal to the 1 terminal.

  • Page 375: Hazard Switch

    Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM (10) Hazard Switch Hazard Switch Continuity 1. Measure the resistance with ohmmeter between the a terminal and c terminal, between the d terminal and e terminal. 2. If the measurement is not the same as below, the hazard switch or the bulb is faulty.

  • Page 376: Fuel Level Sensor

    Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM (12) Fuel Level Sensor Fuel Level Sensor 1. Remove the fuel level sensor from the fuel tank. 2. Measure the resistance across the sensor terminal and its body. 3. If resistance does not meet reference value, the sensor is faulty.

  • Page 377: Disassembling And Assembling

    Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM [2] DISASSEMBLING AND ASSEMBLING (1) Starter Disassembling Motor 1. Disconnect the connecting lead (9) from the magnet switch (8). 2. Remove the screws (6), and then separate the end frame (4), yoke (2) and armature (1).

  • Page 378: Alternator

    Tractor Manuals Scotland L4400 , 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.
  • Page 379 Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM Rectifier 1. Remove the four screws holding the rectifier and the stator lead wires. 2. Remove the rectifier (1). (1) Rectifier W1136721 Rear End Frame 1. Unscrew the two nuts and two screws holding the drive end frame and the rear end frame.

  • Page 380: Servicing

    Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM Bearing on Drive End Side 1. Press out the bearing from drive end frame (3) with a press and jig (1). (1) Jig (3) Drive End Frame (2) Block W1137587 Bearing at Slip Ring Side 1.
  • Page 381 Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM 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 382 Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM Brush Holder 1. Check the continuity across the brush holder and the holder support with an ohmmeter. 2. If it conducts, replace the brush holder. Brush holder – Resistance Infinity Holder support...
  • Page 383 Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM (2) Alternator Bearing 1. Check the bearing for smooth rotation. 2. If it does not rotate smoothly, replace it. Stator 1. Measure the resistance across each lead of the stator coil with an ohmmeter.
  • Page 384 Tractor Manuals Scotland L4400 , WSM ELECTRICAL SYSTEM Brush Wear 1. Measure the brush length with vernier calipers. 2. If the measurement is less than allowable limit, replace it. 3. Make sure that the brush moves smoothly. 4. If the brush is defective, replace it.
  • Page 385 Tractor Manuals Scotland 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 Tractor Manuals Scotland - Please Do Not Copy Printed in Japan 2007.

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