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WORKSHOP MANUAL

TRACTOR

M108S

KiSC issued 05, 2012 A

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Page 1 WORKSHOP MANUAL TRACTOR M108S KiSC issued 05, 2012 A...
Page 2 TO THE READER This Workshop Manual has been prepared to provide servicing personnel with information on the mechanism, service and maintenance of M108S. It is divided into three parts, “General", “Mechanism” and “Servicing”. General Information on the tractor identification, the general precautions, maintenance check list, check and maintenance and special tools are described.
Page 3 SAFETY INSTRUCTIONS M108S, WSM 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. It is essential that you read the instructions and safety regulations before you attempt to repair or use this unit.
Page 4 SAFETY INSTRUCTIONS M108S, WSM 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 SAFETY INSTRUCTIONS M108S, WSM 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 SAFETY INSTRUCTIONS M108S, WSM 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. KiSC issued 05, 2012 A...
Page 7: Safety Decals
SAFETY INSTRUCTIONS M108S, WSM 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. KiSC issued 05, 2012 A...
Page 8 SAFETY INSTRUCTIONS M108S, WSM KiSC issued 05, 2012 A...
Page 9 SAFETY INSTRUCTIONS M108S, WSM KiSC issued 05, 2012 A...
Page 10 SAFETY INSTRUCTIONS M108S, WSM KiSC issued 05, 2012 A...
Page 11 SAFETY INSTRUCTIONS M108S, WSM KiSC issued 05, 2012 A...
Page 12: Specifications
SPECIFICATIONS M108S, WSM SPECIFICATIONS M108S Model Model V3800-CR-TI Type Vertical, water-cooled, 4-cycle diesel engine No. of cylinder Total displacement 3769 cm (230.0 cu.in.) 100 × 120 mm (3.9 x 4.7 in.) Bore and stroke −1 Net power 80.6 kW (108 HP)* / 2600 min...
Page 13: Traveling Speeds
TRAVELING SPEEDS M108S, WSM TRAVELING SPEEDS (At rated engine rpm) Model M108S Tire size (Rear) 460 / 85R34 (18.4R34) Transmission type with Dual speed Shuttle shift Range gear shift Main gear shift lever lever lever km/h (mph) km/h (mph) 0.36 (0.22) 0.30 (0.19)
Page 14 TRAVELING SPEEDS M108S, WSM (At rated engine rpm) Model M108S Tire size (Rear) 460 / 85R34 (18.4R34) Transmission type with Dual speed Shuttle shift Range gear shift Main gear shift lever lever lever km/h (mph) km/h (mph) 0.36 (0.22) 0.30 (0.19) 0.46 (0.29)
Page 15 DIMENSIONS M108S, WSM DIMENSIONS KiSC issued 05, 2012 A...
Page 16 GENERAL KiSC issued 05, 2012 A...
Page 17: Table Of Contents
GENERAL CONTENTS 1. TRACTOR IDENTIFICATION ................. G-1 2. GENERAL PRECAUTIONS ................G-2 3. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING .. G-3 [1] WIRING...................... G-3 [2] BATTERY....................G-5 [3] FUSE......................G-5 [4] CONNECTOR .................... G-5 [5] HANDLING OF CIRCUIT TESTER............G-6 4.
Page 18: Tractor Identification
G GENERAL M108S, WSM 1. TRACTOR IDENTIFICATION When contacting your local KUBOTA distributor, always specify engine serial number, tractor serial number and hour meter reading. (1) Tractor Identification Plate (3) CABIN Identification Plate (2) Tractor Serial Number (CABIN Serial Number)
Page 19: General Precautions
G GENERAL M108S, WSM 2. GENERAL PRECAUTIONS • During disassembly, carefully arrange removed parts in a clean area to prevent confusion later. 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.
Page 20: Handling Precautions For Electrical Parts And Wiring
G GENERAL M108S, WSM 3. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING To ensure safety and prevent damage to the machine and surrounding equipment, heed the following precautions in handling electrical parts and wiring. IMPORTANT • Check electrical wiring damage loosened connection every year.
Page 21 G GENERAL M108S, WSM • Securely insert grommet. (1) Grommet (A) Correct (B) Incorrect W1011388 • Securely clamp, being careful not to damage wiring. (1) Clamp (3) Clamp • Wind Clamp Spirally (4) Welding Dent (2) Wire Harness W1011458 • Clamp wiring so that there is no twist, unnecessary sag, or excessive tension, except for movable part, where sag be required.
Page 22: Battery
G GENERAL M108S, WSM [2] BATTERY • Take care not to confuse positive and negative terminal posts. • When removing battery cables, disconnect negative cable first. When installing battery cables, check for polarity and connect positive cable first. • Do not install any battery with capacity other than is specified (Ah).
Page 23: Handling Of Circuit Tester
G GENERAL M108S, WSM • Use sandpaper to remove rust from terminals. • Repair deformed terminal. Make certain there is no terminal being exposed or displaced. (1) Exposed Terminal (3) Sandpaper (2) Deformed Terminal (4) Rust W1012346 • Make certain that there is no female connector being too open.
Page 24: Lubricants, Fuel And Coolant
G GENERAL M108S, WSM 4. LUBRICANTS, FUEL AND COOLANT Place Capacity Lubricants, fuel and coolant 175 L No. 2-D diesel fuel Fuel tank 46.2 U.S.gals No. 1-D diesel fuel if temperature is below −10 °C (14 °F) 38.4 lmp.gals 9.6 L Engine block 10 U.S.qts...
Page 25 G GENERAL M108S, WSM Greasing Place No. of greasing point Capacity Type of grease Top link Top link bracket Lift rod Until grease Multipurpose overflow Front axle gear case support grease NLGI-2 or NLGI-1 (GC-LB) Front axle support Steering joint shaft...
Page 26: Tightening Torques
G GENERAL M108S, WSM 5. TIGHTENING TORQUES [1] GENERAL USE SCREWS, BOLTS AND NUTS Screws, bolts, and nuts whose tightening torques are not specified in this Workshop Manual should be tightened according to the table below. Indication on top of...
Page 27: Hydraulic Fittings
G GENERAL M108S, WSM [3] HYDRAULIC FITTINGS Hydraulic Hose Fittings Tightening torque Hose size Thread size N·m kgf·m lbf·ft 13.8 to 15.6 1.40 to 1.60 10.2 to 11.5 23 to 27 2.3 to 2.8 17 to 20 46 to 52 4.6 to 5.4...
Page 28: Maintenance
G GENERAL M108S, WSM 6. MAINTENANCE Indication on hour meter Since Refer- Impor Items then ence -tant 50 100 150 200 250 300 350 400 450 500 550 600 650 700 every page Engine start system Check 50 hrs G-18...
Page 29 G GENERAL M108S, WSM Indication on hour meter Since Refer- Impor Items then ence -tant 50 100 150 200 250 300 350 400 450 500 550 600 650 700 every page 18 Water separator Clean G-30 19 Fuel filter Replace...
Page 30 G GENERAL M108S, WSM Additional Items for CABIN Type Indication on hour meter Since Refer- Impor Items then ence -tant 50 100 150 200 250 300 350 400 450 500 550 600 650 700 every page Inner air filter Clean...
Page 31: Check And Maintenance
G GENERAL M108S, WSM 7. CHECK AND MAINTENANCE CAUTION • Be sure to check and service the tractor on a flat place with engine shut off, the parking brake on and chock the wheels. [1] DAILY CHECK To prevent trouble from occurring, it is important to know the condition of the tractor. Check the following items before starting.
Page 32: Check Points Of Initial 50 Hours
G GENERAL M108S, WSM [2] CHECK POINTS OF INITIAL 50 HOURS Changing Engine Oil CAUTION • Before changing oil, be sure to stop the engine. • Allow engine to cool down sufficiently, oil can be hot and can burn. 1. To drain the used oil, remove the drain plugs (1) at the bottom of the engine and drain the oil completely into the oil pan.
Page 33 G GENERAL M108S, WSM Changing Transmission Fluid CAUTION • Allow engine to cool down sufficiently, oil can be hot and can burn. 1. To drain the used oil, remove the drain plug (1) at the bottom of the transmission case and drain the oil completely into the oil pan.
Page 34 G GENERAL M108S, WSM Changing Front Differential Case Oil 1. To drain the used oil, remove the drain and filling plug (1), (3) at the front differential case and drain the oil completely into the oil pan. 2. After draining reinstall the drain plug (1).
Page 35: Check Points Of Every 50 Hours
G GENERAL M108S, WSM [3] CHECK POINTS OF EVERY 50 HOURS Checking Engine Start System CAUTION • Do not allow anyone near the tractor while testing. • If the tractor does not pass the test, do not operate the tractor.
Page 36: Check Points Of Every 100 Hours
G GENERAL M108S, WSM [4] CHECK POINTS OF EVERY 100 HOURS Checking Battery Condition CAUTION • Keep electrolyte away from eyes, hands and clothes. If you are spattered with it, wash it away completely with water immediately and get medical attention.
Page 37 G GENERAL M108S, WSM Cleaning Air Cleaner Element 1. Remove the air cleaner cover (4) and primary element (2). 2. Clean the primary element if: • When dry dust adheres to the element, blow compressed air from the inside turning the element. Pressure of compressed air must be under 205 kPa (2.1 kgf/cm...
Page 38 G GENERAL M108S, WSM Adjusting Fan Belt Tension CAUTION • Be sure to stop the engine before checking belt tension. 1. Stop the engine and remove the key. 2. Apply moderate thumb pressure to belt between pulleys. 3. If tension is incorrect, loosen the alternator mounting bolts and,...
Page 39 G GENERAL M108S, WSM 2) Brake Pedal Stroke and Difference between Right and Left Pedal Strokes CAUTION • When checking, park the tractor on flat ground, and stop the engine. 1. Disengage the brake pedal lock. 2. Step on either side brake pedal and measure the level difference (pedal stroke) between right and left pedals.
Page 40 G GENERAL M108S, WSM Adjusting Parking Brake Lever Free Play 1. Release the parking brake lever. 2. Pull the parking brake lever with a force of 30.0 kg (66.1 lbs) for checking the free play and check the number of notches.
Page 41 G GENERAL M108S, WSM Lubricating Grease Fittings 1. Apply a small amount of multipurpose grease to following points: 2. If you operated the machine in extremely wet and muddy condition, lubricate grease fittings more often. (1) Grease Fitting (Front Axle Support)
Page 42: Check Points Of Every 200 Hours
G GENERAL M108S, WSM [5] CHECK POINTS OF EVERY 200 HOURS Changing Hydraulic Oil Filter 1. Refer to “[2] CHECK POINTS OF INITIAL 50 HOURS” in this section. W1046442 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 43 G GENERAL M108S, WSM Draining Fuel Tank Water 1. Remove the drain plug (2) at the bottom of the fuel tank (1) to left sediments, impurities and water out of the tank. 2. Finally attach the drain plug (2) on the fuel tank (1).
Page 44 G GENERAL M108S, WSM Cleaning Inner Air Filter 1. Remove the inner air filter, and blow air the direction opposite to the filter’s normal air flow. Pressure of compressed air must be under 210 kPa (2.1 kgf/cm , 30 psi).
Page 45 G GENERAL M108S, WSM Cleaning Fresh Air Filter 1. Remove the knob bolts (3) and pull out filter (1). NOTE • Do not hit the filter. If the filter becomes deformed, dust may enter into the air-conditioner, which may cause damage and malfunction.
Page 46: Check Point Of Every 300 Hours
G GENERAL M108S, WSM Sliding Air Conditioner Condenser CAUTION • The condenser and receiver become hot while the air conditioner is running. Before checking or cleaning them, wait long enough until they cool down. 1. Release the air conditioner hoses off the hook.
Page 47: Check Points Of Every 400 Hours
G GENERAL M108S, WSM [7] CHECK POINTS OF EVERY 400 HOURS Cleaning Water Separator 1. Close the fuel cock (1). 2. Unscrew the retainer ring (2) and remove the cup (3), and rinse the inside with kerosene. 3. Take out the element and dip it in the kerosene to rinse.
Page 48 G GENERAL M108S, WSM Changing Brake Oil CAUTION • Be sure to check and service the tractor on a flat place with engine shut off and applying the parking brake on. IMPORTANT • Be sure to use the recommended brake oil. (Refer to “4.
Page 49: Check Point Of Every 800 Hours
G GENERAL M108S, WSM Adjusting King-pin Pivot 1. Jack up the tractor, then loosen the lock nut (2). 2. Measure the adjusting screw tightening torque. 3. If tightening torque is not within the factory specifications, adjust the adjusting screw (1).
Page 50: Check Points Of Every 1 Year
G GENERAL M108S, WSM [12] CHECK POINTS OF EVERY 1 YEAR Replacing Air Cleaner Primary and Secondary Element 1. Refer to “[4] CHECK POINTS OF EVERY 100 HOURS” in this section. W1052222 Checking Air Conditioner Pipes and Hoses 1. Check to see that all lines and hose clamps are tight and not damaged.
Page 51: Check Points Of Every 2 Years
G GENERAL M108S, WSM [13] CHECK POINTS OF EVERY 2 YEARS Flush Cooling System and Changing Coolant CAUTION • Do not remove the radiator cap when the engine is hot. Then loosen cap slightly to the stop to relieve any excess pressure before removing cap completely.
Page 52 G GENERAL M108S, WSM Flush Cooling System and Changing Coolant (Continued) 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.
Page 53 G GENERAL M108S, WSM 5. Adding the LLC (1) Add only water if the mixture reduces in amount by evaporation. (2) If there is a mixture leak, add the LLC of the same manufacture and type in the same mixture percentage.
Page 54 G GENERAL M108S, WSM Replacing Brake Hose 1. Replace the brake hoses (1). 2. After replacing the hoses, bleed an air from brake system. (Refer to “[14] OTHERS” in this section.) (1) Brake Hose W1054709 Replacing Parking Brake Cable 1. Replace the parking brake cable (3).
Page 55: Others
G GENERAL M108S, WSM [14] OTHERS Bleeding Fuel System Air must be removed : 1. When the fuel filter or lines ar removed. 2. When water is drained from water separator. 3. When tank is completely empty. 4. After the tractor has not been used for a long period of time.
Page 56 G GENERAL M108S, WSM Bleeding Brake System NOTE • While bleeding, make sure to keep enough brake oil in the brake oil reservoir. 1. Disconnect the brake pipes (1) from the master cylinder. 2. Move the brake pedal up and down by hand. At this time, when raising the pedal, close the master cylinder outlet by a finger, and when lowering, release the finger.
Page 57: Replacing Fuse
G GENERAL M108S, WSM Replacing Fuse Fuse No. Capacity (Ampere) Protected circuit Meter backup 15 A Flasher (Hazard) 15 A Dome light, Brake lamp 15 A Head light 25 A Auxiliary power 15 A Tail / position lamp, Horn 10 A...
Page 58 G GENERAL M108S, WSM Replacing Light Bulb 1. Head lights. Take the bulb out of the light body and replcwith a new one. 2. Other lights Detach the lens and replace the bulb. Light Capacity Head lights 60 / 55 W...
Page 59 G GENERAL M108S, WSM Checking the Amount of Refrigerant (Gas) 1. A shortage of refrigerant impairs the air conditioner performance. Check the following points. If it is indicated that the amount of refrigerant is extremely low. Do to inspect and charge.
Page 60: Special Tools
G GENERAL M108S, WSM 8. SPECIAL TOOLS [1] SPECIAL TOOLS FOR ENGINE Diesel Engine Compression Tester Code No.: 07909-30208 (Assembly) 07909-31251 (G) 07909-30934 (A to F) 07909-31271 (I) 07909-31211 (E and F) 07909-31281 (J) 07909-31231 (H) Application: Use to measure diesel engine compression and diagnostics of need for major overhaul.
Page 61 G GENERAL M108S, WSM NOTE • The following special tools are not provided, so make them referring to the figure. Idle Gear Bushing Replacing Tool Application: Use to press out and to press fit the bushing. 1. For idle gear bushing 196 mm (7.72 in.)
Page 62 G GENERAL M108S, WSM Valve Guide Replacing Tool Application: Use to press out and press fit the valve guide. 225 mm (8.86 in.) 70 mm (2.8 in.) 45 mm (1.8 in.) 20 mm dia. (0.79 in dia.) 11.7 to 11.9 mm dia. (0.461 to 0.468 in. dia.) 6.50 to 6.60 mm dia.
Page 63 G GENERAL M108S, WSM Balancer Bushing Replacing Tool 1 Assembly Application: Use to press fit the bushing. Name of Part Q’ty. Remarks Shaft Piece 1 Piece 2 M6 × P1.0 Bolt W1042867 Balancer Bushing Replacing Tool 1 Components Parts 1) Shaft 498 mm (19.6 in.)
Page 64 G GENERAL M108S, WSM 2) Piece 1 Chamfer 0.1 mm (0.004 in.) 1.0 mm (0.039 in.) Chamfer 1.0 mm (0.039 in.) 53.80 to 53.90 mm dia. (2.119 to 2.122 in. dia.) 20.020 to 20.041 mm dia. (0.78819 to 0.78901 in. dia.) 48 mm dia.
Page 65 G GENERAL M108S, WSM Balancer Replacing Tools 3, 4, 5 Application: Use to press fit the bushing. NOTE • This special tool is not provided, so make it referring to the figure. Name of Part Q’ty. Bracket Flange Nut Washer...
Page 66 G GENERAL M108S, WSM 2) Shaft 44 mm dia. (1.7 in. dia.) 12 mm (0.47 in.) Chamfer 1.0 mm (0.039 in.) 3.0 mm (0.12 in.) 3.0 mm (0.12 in.) 30 mm (1.2 in.) 38 mm (1.5 in.) 35 mm (1.4 in.) M12 ×...
Page 67 G GENERAL M108S, WSM 4) Joint 1 M12 × P1.25 Chamfer 1.0 mm (0.039 in.) 30 mm dia. (1.2 in. dia.) 13 mm dia. (0.51 in. dia.) Chamfer 3.0 mm (0.12 in.) 3.0 mm (0.12 in.) 45 mm (1.8 in.) 75 mm (3.0 in.)
Page 68 G GENERAL M108S, WSM 7) Piece 3 26 mm (1.0 in.) 18 mm (0.71 in.) 16.5 to 17.0 mm (0.650 to 0.669 in.) 1.5 mm (0.059 in.) 53.00 to 53.20 mm dia. (2.087 to 2.094 in dia.) 49.55 to 49.75 mm dia. (1.951 to 1.958 in dia.) 16 mm (0.63 in.)
Page 69 G GENERAL M108S, WSM Engine Stand Application: Use to support engine. 480 mm (18.9 in.) 50 mm (2.0 in.) 108.5 mm (4.272 in.) 262.5 mm (10.33 in.) 12.5 mm (0.492 in.) 237.5 mm (9.350 in.) 142.5 mm (5.610 in.) 95 mm (3.7 in.) 14 mm dia.
Page 70 G GENERAL M108S, WSM Injector Adaptor for Measuring Cylinder Compression Pressure Application : Use for measuring diesel engine compression pressure. 16.14 to 16.20 mm dia. (0.6355 to 0.6377 in. dia.) 65 mm (2.6 in.) 29.80 to 30.00 mm dia. (1.174 to 1.181 in. dia.) 102.5 mm (4.035 in.)
Page 71: Special Tools For Tractor
G GENERAL M108S, WSM [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 72 G GENERAL M108S, WSM Toe-in Gauge Code No. : 07909-31681 Application : This allows easy measurement of toe-in for all machine models. W10266890 Injector CH3 Code No. : 07916-52501 Application : Use for injecting calcium chloride solution into, and removing it from, rear tires.
Page 73 G GENERAL M108S, WSM Shuttle Clutch Compression Tool Code No. : 07916-55031 Application : Use exclusively for pushing the thrust collar, remove the external snap ring. NOTE • Replace the center guide (1) for shown in figure. 20.0 mm dia. (0.787 in. dia.) 11.5 mm dia.
Page 74 G GENERAL M108S, WSM Clutch Tool B Code No.: 07916-53041 Application: Use for mounting the clutch to the flywheel. (1) Gauge Ring (No. 07916-53041) (3) Centering Guide (No. 07916-53041) (2) Center Bar (No. 07916-53041) W10520300 Rear Axle Cover Puller Code No. : 07916-51041 Application : Use for removing a rear axle cover from rear axle.
Page 75 G GENERAL M108S, WSM NOTE • Special tools for R134a refrigerant air conditioning system introduced below are available from DENSO CO. LTD. Air Conditioner Service Tool Code No.: DENSO.CO. 95048-00061 Application: Use for charging, testing or discharging the air conditioning system.
Page 76 G GENERAL M108S, WSM NOTE • The following special tools are not provided, make them referring to the figure. Stopper Magnet Clutch (for A/C Compressor) Application: Use to loosen and tighten the magnet clutch mounting nut. (Use radius M) 125 mm (4.92 in.) 2.09 rad (120 °)
Page 77 G GENERAL M108S, WSM NOTE • The following special tools are not provided, so make them referring to the figure. 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.)
Page 78 G GENERAL M108S, WSM Valve Adaptor Application : Use for measuring the system pressure of shuttle valve. 24.0 mm (0.945 in.) 27.7 mm (1.09 in.) G1/4 11.0 mm (0.433 in.) 15.0 mm (0.591 in.) 40.0 mm (1.57 in.) 60.0 mm (2.36 in.) 15.0 mm (0.591 in.)
Page 79 G GENERAL M108S, WSM Cylinder Safety Valve Setting Pressure Adaptor Application : Use for setting the safety valve to the nozzle tester to measure cracking pressure and check oil tightness of the safety valves. 45.0 mm (1.77 in.) 10.0 mm dia. (0.397 in. dia.) 40.0 mm (1.57 in.)
Page 80 G GENERAL M108S, WSM Hydraulic Cylinder Block Tool Application : Use for separating a hydraulic cylinder block. NOTE • The sealing surface of the connecting parts must be welded. 75.0 mm (2.95 in.) 12 mm dia. (0.47 in. dia.) 24.0 mm (0.945 in.) Radius 31.0 mm (1.22 in.
Page 81 G GENERAL M108S, WSM Front Axle Rocking Restrictor 120 mm (4.72 in.) 12.0 mm (0.472 in.) M10 × P1.25 30.0 mm (1.18 in.) M16 × P1.5 10 mm (0.39 in.) 20.0 mm (0.787 in.) 36.0 mm (1.42 in.) 64.0 mm (2.52 in.) 45.0 mm (1.77 in.)
Page 82 G GENERAL M108S, WSM Clutch Compression Tool Application : Use exclusively for pushing the thrust collar to remove the external snap ring. 60.0 mm (2.36 in.) 120 mm (4.72 in.) M18 × P1.5 screw 45.0 mm (1.77 in.) 115 mm (4.53 in.) 12.0 mm (0.472 in.)
Page 83: Tires
G GENERAL M108S, WSM 9. TIRES [1] TYPE OF TIRES IMPORTANT • Do not use tires larger than specified. Type of Tire Front Rear 9.5L-15 16.9-34 6PR 10.0-16 6PR 18.4-34 Farm Tire 12.4-24 6PR 18.4R36 13.6-24 6PR 18.4-30 13.6R24 18.4R30...
Page 84 G GENERAL M108S, WSM 13.6-24 3.6R24 12.4-24 1565 mm (61.61 in.) 1675 mm (65.94 in.) A : Tread NOTE • Need to limit turning angle depended on the tire size. Refer to the chart provided for additional instructions. Front Wheel Steering Angle 1.
Page 85: Rear Wheel
G GENERAL M108S, WSM (2) Rear Wheel Adjusting Rear Tread Rear tread width can be adjusted as shown with the standard equipped tires. To change the tread width. 1. Remove the wheel rim and / or disc mounting bolts. 2. Change the position of the rim and / or disc (right and left) to the desired position, and tighten the bolts.
Page 86: Wheel Hub
G GENERAL M108S, WSM [3] WHEEL HUB Front wheel hub Rear wheel hub Screw circle diameter 203.2 mm (8 in.) 203.2 mm (8 in.) Number of screws Screws M16 x P1.5 M16 x P1.5 Hub pilot diameter (B) 152.4 mm (6 in.) 152.4 mm (6 in.)
Page 87: Tire Liquid Injection
G GENERAL M108S, WSM [5] TIRE LIQUID INJECTION Auxiliary weights can be used to increase traction force for plowing in fields or clayey grounds. 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 88 G GENERAL M108S, WSM 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- 52501).
Page 89 G GENERAL M108S, WSM Injection CAUTION • When a calcium chloride solution is used, cool it before pouring it into the tire. • Do not fill tires with water or solution more than 75 % of full capacity (to the valve stem level).
Page 90 G GENERAL M108S, WSM 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 91: Implement Limitations
G GENERAL M108S, WSM 10. IMPLEMENT LIMITATIONS The KUBOTA Tractor has been thoroughly tested for proper performance with implements sold or approved by KUBOTA. Use with implements which are not sold or approved by KUBOTA and which exceed the maximum specifications listed below, or which are otherwise unfit for use with the KUBOTA Tractor may result in malfunctions or failures of the tractor, damage to other property and injury to the operator or others.
Page 92 G GENERAL M108S, WSM Implement Remarks M108S Max. Tank Capacity 5000 L (1321 U.S.gals, 1100 Imp.gals) Slurry Tank Max. Load Capacity 6000 kg (13200 lbs) Max. Load Capacity 7000 kg (15400 lbs) Trailer Max. Drawbar Load 1500 kg (3300 lbs) Max.
Page 93 G GENERAL M108S, WSM Implement Remarks M108S Max. Width 5490 mm (216 in.) Cultivator Number of Rows Max. Weight 900 kg (1980 lbs) Max. Cutting Width 2600 mm (102 in.) Front Blade *1, *2 Max. Oil Pressure 19.6 MPa (200 kgf/cm , 2842 psi) Max.
Page 94 ENGINE KiSC issued 05, 2012 A...
Page 95 MECHANISM CONTENTS 1. FEATURE ...................... 1-M1 2. ENGINE BODY ..................... 1-M2 [1] CYLINDER BLOCK................. 1-M2 [2] HALF-FLOATING HEAD COVER ............1-M2 [3] CYLINDER HEAD ................... 1-M3 [4] CENTER DIRECT INJECTION SYSTEM (E-CDIS)......1-M3 [5] PISTON....................1-M4 [6] BUILT-IN DYNAMIC BALANCER ............1-M4 3.
Page 96: Feature
ENGINE M108S, WSM 1. FEATURE The diesel engines have the feature of low cost and high efficiency. On the other hand, it is said that an amount of the nitrogen oxide (NOx) and particulate matter (PM) contained in their exhaust gas is relatively...
Page 97: Engine Body
ENGINE M108S, WSM 2. ENGINE BODY [1] CYLINDER BLOCK This engine employs separate type crankcases - the crankcase 1 (1) with combustion part and the crankcase 2 (2) which supports the crankcase 1 (1) and reduces noise. Since it is a hanger type, you can easily assemble / disassemble it.
Page 98: Cylinder Head
ENGINE M108S, WSM [3] CYLINDER HEAD This engine employs four valve system, the cylinder head is provided with double intake passenge in order to ensure appropriate air suction and give an optimum swirl. (1) Intake (2) Exhaust W1013336 [4] CENTER DIRECT INJECTION SYSTEM (E-CDIS)
Page 99: Piston
ENGINE M108S, WSM [5] PISTON Piston’s skirt is coated with molybdenum disulfide , which reduces the piston slap noise and thus the entire operating noise. Molybdenum disulfide (MoS The molybdenum disulfied serves as a solid lubricant, like a Graphite or Teflon. This material helps resist metal wears even with little lube oil.
Page 100: Lubricating System
ENGINE M108S, WSM 3. LUBRICATING SYSTEM [1] OIL COOLER V3 series engine has a water-cooled oil cooler that not only cools hot oil, but also warms the cool engine oil shoftly after start up. As shown in the figure, the oil flows inside the...
Page 101: Cooling System
ENGINE M108S, WSM 4. COOLING SYSTEM [1] THERMOSTAT Conventional thermostatically-controlled valves (outlet water temperature control type) open against the flow of coolant. In this design, the pressure (steam pressure + water pump’s discharge pressure) affects the open/close performance of such valve. In other words,...
Page 102: Bottom Bypass System
ENGINE M108S, WSM [2] BOTTOM BYPASS SYSTEM Bottom bypass system is introduced in V3 series for improving the cooling performance of the radiator. While the temperature of coolant in the engine is low, the thermostat is held closed and the coolant is allowed to flow through the bypass pipe and to circulate in the engine.
Page 103: Fuel System
ENGINE M108S, WSM 5. FUEL SYSTEM [1] GENERAL (1) Injector (2) Rail (3) Supply Pump (4) SCV (Suction Control Valve) (5) Fuel Cooler (6) Check Valve (7) Fuel Filter (8) Electromagnetic Fuel Feed Pump (9) Water Separator (10) Fuel Tank...
Page 104: Intake And Exhaust System
ENGINE M108S, WSM 6. INTAKE AND EXHAUST SYSTEM [1] INTAKE AIR HEATER The intake air heater is introduced in order to further improve the starting performance and to reduce the white smoke at cold starting. The intake air heater is mounted on the intake manifold.
Page 105: Intercooler
ENGINE M108S, WSM [3] INTERCOOLER When the turbocharger (2) compresses the intake air, the air becomes heated (due to compression) and expands. When the heated air expands it becomes less dense. The result is that part of the purpose of the turbocharger is defeated;...
Page 106: Common Rail System (Crs)
ENGINE M108S, WSM 7. COMMON RAIL SYSTEM (CRS) [1] GENERAL (1) Injector (2) Rail (3) Supply Pump (4) Sensors (5) Engine ECU W1014620 The common rail system adopted for the V3800-CR-TI is the combustion system which always controls the combustion state in cylinders optimally, by storing ultra high pressure fuel in the rail and performing ultra high pressure injection by the diesel engine.
Page 107 ENGINE M108S, WSM The common rail control system can be broadly divided into the following three areas : sensors, engine ECU, and actuators. Sensors Sensor detects the condition of the engine and the pump. Refer to “[5] ENGINE CONTROL SYSTEM : (3) Sensors”.
Page 108: Supply Pump
ENGINE M108S, WSM [2] SUPPLY PUMP The supply pump is primarily composed of the pump unit (eccentric cam, ring cam, two plungers), the SCV (suction control valve) (2), the fuel temperature sensor and the feed pump (trochoid type), and is actuated at 1/ 2 the engine crankshaft rotation.
Page 109 ENGINE M108S, WSM SCV (Suction Control Valve) (1) Actuating Voltage (2) Current (3) Average Current Difference (4) Plunger (5) Feed Pump (6) Regulating Valve (7) Cylinder (8) SCV A : Low Suction Quantity B : High Suction Quantity C : ON...
Page 110 ENGINE M108S, WSM Pump Unit (Eccentric Cam, Ring Cam, Plunger) The eccentric cam (2) is attached to the drive shaft (1) and the ring cam (3) is installed on the eccentric cam (2). There are two plungers (5) at positions symmetrical above and below the ring cam (3).
Page 111: Rail
ENGINE M108S, WSM [3] RAIL The function of the rail (2) is to distribute fuel pressurized by the supply pump to each cylinder injector. The component parts are the pressure limiter (1) and the rail pressure sensor (3). The function of the pressure limiter (1) is to open the valve to release fuel pressure if the fuel pressure in the rail becomes abnormally high.
Page 112: Injector
ENGINE M108S, WSM [4] INJECTOR The injector injects the pressurized fuel in the rail into the engine combustion chamber at the optimal injection timing, injection quantity, injection rate, and injection pattern, in accordance with signals from the engine ECU (Electronic Control Unit) (1).
Page 113 ENGINE M108S, WSM Injector Operation (1) Solenoid (2) TWV (Two-Way Valve) (3) Outlet Orifice (4) Command Piston (5) Nozzle (6) Leak Passage (7) Inlet Orifice (8) Control Chamber A : Non Injection B : Injection C : End of Injection...
Page 114 ENGINE M108S, WSM Injector Actuation Circuit In order to improve injector responsiveness, the actuation voltage has been changed to high voltage, speeding up both solenoid magnetization and the response of the TWV. The charge circuit in the engine ECU (5) raises each battery voltage to approximately 110V, which is supplied to the injector (1) by signal from the engine ECU (5) to actuate the injector (1).
Page 115: Engine Control System
ENGINE M108S, WSM [5] ENGINE CONTROL SYSTEM (1) Engine Control System Diagram (1) Accelerator Position Sensor (2) Key Switch ON Signal (3) Starter Switch Signal (4) Vehicle Speed Signal (5) Neutral Switch Signal (6) Rail Pressure Sensor (7) Rail (8) Pressure Limiter...
Page 116: Engine Ecu (Electronic Control Unit)
ENGINE M108S, WSM (2) Engine ECU (Electronic Control Unit) The engine ECU constantly ascertains the status of the engine through signals from the sensors, calculates fuel injection quantities etc. appropriate to the conditions, actuates the actuators, and controls to keep the engine in an optimal state.
Page 117: Sensors
ENGINE M108S, WSM (3) Sensors Crankshaft Position Sensor (Engine Speed Sensor) The crankshaft position sensor (3) is installed near the flywheel pulsar gear (2) on the flywheel (1) and detects the crankshaft angle and outputs the engine speed signal. The sensor unit is a MRE (magnetic resistance element) type.
Page 118 ENGINE M108S, WSM Accelerator Position Sensor The accelerator position sensor detects the opening angle of the accelerator pedal and converts the accelerator opening angle into an electric signal and outputs it to the engine ECU. This sensor uses a hall element (2) (5) to generate voltage from change in the direction of the magnetic field.
Page 119 ENGINE M108S, WSM Intake Air Temperature Sensor The intake air temperature sensor (A) detects the temperature of the intake air after it has passed the turbocharger. The sensor portion that detects the temperature contains a thermistor (1). The thermistor (1), which has an electrical resistance that changes with temperature, is used to detect the intake air temperature.
Page 120: Exhaust Gas Recirculation (Egr) System
ENGINE M108S, WSM 8. EXHAUST GAS RECIRCULATION (EGR) SYSTEM [1] GENERAL (1) EGR Valve (2) Reed Valve (3) Intake Manifold (4) Exhaust manifold (5) EGR Cooler A : Intake Air B : Exhaust Gas C : Coolant Inlet Port D : Coolant Outlet Port W1020494 In order to meet with the strict emission regulations, Kubota has adopted the EGR on the V3800-CR-TI.
Page 121: Egr Valve
ENGINE M108S, WSM [2] EGR VALVE (1) Position Sensor (2) Brush (3) Circuit Sensor (4) Commutator (5) Motor Exterior (6) Poki Poki Core (7) Rotor (8) Bearing (9) Magnet (10) Washer (11) Boss (12) Shaft (13) Assist Spring (14) Spring Holder...
Page 122: Reed Valve
ENGINE M108S, WSM [3] REED VALVE The reed valve is provided at the confluence of exhaust gas after passing the EGR valve, and intake air. It operates by the pressure difference between inside of the crankcase and the atmosphere, and prevents backflow of the mixture of exhaust gas and intake air generated by the piston and valves.
Page 123 SERVICING CONTENTS 1. TROUBLESHOOTING ..................1-S1 2. SERVICING SPECIFICATIONS ..............1-S5 3. TIGHTENING TORQUES ................1-S11 4. CHECKING, DISASSEMBLING AND SERVICING........1-S13 [1] CHECKING AND ADJUSTING [V3800-CR-TI] ........1-S13 (1) Engine Body..................1-S13 (2) Lubricating System ................1-S15 (3) Cooling System .................1-S15 (4) Turbocharger ..................1-S17 [2] SEPARATING ENGINE .................1-S18 (1) Separating Front Axle Support as a Unit ..........1-S18 (2) Separating Engine from Clutch Housing ...........1-S23 [3] DISASSEMBLING AND ASSEMBLING [V3800-CR-TI].......1-S25...
Page 124: Troubleshooting
ENGINE M108S, WSM 1. TROUBLESHOOTING NOTE • This troubleshooting shows only mechanical failures. Regarding the failures of common rail system (CRS), please refer to the diagnosis manual “COMMON RAIL SYSTEM ENGINE” (Code No. 9Y130-00142). Reference Symptom Probable Cause Solution Page...
Page 125 ENGINE M108S, WSM Reference Symptom Probable Cause Solution Page Engine Revolution Is Fuel filter clogged or dirty Replace G-30 Not Smooth Air cleaner clogged Clean or replace G-20 Fuel leak due to loose injection pipe retaining nut Tighten retaining nut...
Page 126 ENGINE M108S, WSM Reference Symptom Probable Cause Solution Page Deficient Output Engine’s moving parts seem to be seizing Repair or replace – Supply pump malfunctioning Repair or replace 1-S27 Deficient injection Replace injector 1-S32, 33 Compression leak Check the 1-S13...
Page 127 ENGINE M108S, WSM Reference Symptom Probable Cause Solution Page High Oil Pressure Different type of oil Use specified oil Relief valve defective Replace 1-S39 Engine Overheated Engine oil level insufficient Replenish G-15 Fan belt broken or elongated Replace or adjust...
Page 128: Servicing Specifications
ENGINE M108S, WSM 2. SERVICING SPECIFICATIONS ENGINE BODY Item Factory Specification Allowable Limit Cylinder Head Surface Flatness – 0.05 mm 0.002 in. Top Clearance 0.72 to 0.90 mm – 0.029 to 0.035 in. Compression V3800-CR-TI 3.09 to 3.29 MPa / 2.41 MPa /...
Page 129 ENGINE M108S, WSM ENGINE BODY (Continued) Item Factory Specification Allowable Limit Valve Stem to Valve Guide Clearance (Intake) 0.055 to 0.085 mm 0.1 mm 0.0022 to 0.0033 in. 0.004 in. Valve Stem O.D. (Intake) 6.960 to 6.975 mm – 0.2741 to 0.2746 in.
Page 130 ENGINE M108S, WSM ENGINE BODY (Continued) Item Factory Specification Allowable Limit Rocker Arm Shaft to Rocker Arm Clearance 0.016 to 0.045 mm 0.15 mm 0.00063 to 0.0017 in. 0.0059 in. Rocker Arm Shaft O.D. 15.973 to 15.984 mm – 0.62886 to 0.62929 in.
Page 131 ENGINE M108S, WSM ENGINE BODY (Continued) Item Factory Specification Allowable Limit Timing Gear Idle Gear 1 to Crank Gear Backlash 0.0490 to 0.193 mm 0.22 mm 0.00193 to 0.00759 in. 0.0087 in. Idle Gear 1 to Cam Gear Backlash 0.0490 to 0.189 mm 0.22 mm...
Page 132 ENGINE M108S, WSM ENGINE BODY (Continued) Item Factory Specification Allowable Limit Piston Ring Gap Top Ring 0.30 to 0.45 mm 1.25 mm 0.012 to 0.017 in. 0.0492 in. Second Ring 0.30 to 0.45 mm 1.25 mm 0.012 to 0.017 in.
Page 133 ENGINE M108S, WSM LUBRICATING SYSTEM Item Factory Specification Allowable Limit Engine Oil Pressure At Idle Speed – 50 kPa 0.5 kgf/cm 7 psi At Rated Speed 200 to 390 kPa 150 kPa 2.0 to 4.0 kgf/cm 1.5 kgf/cm 29 to 56 psi...
Page 134: Tightening Torques
ENGINE M108S, WSM 3. TIGHTENING TORQUES Tightening torque of screws, bolts and nuts on the table below are especially specified. (For general screws, bolts and nuts : Refer to “5. TIGHTENING TORQUES” at “G.GENERAL” section.) Item N·m kgf·m lbf·ft Starter's terminal B mounting nut 9.8 to 11...
Page 135 ENGINE M108S, WSM [V3800-CR-TI] Item N·m kgf·m lbf·ft Cylinder head cover screw 1 6.87 to 11.2 0.700 to 1.15 5.07 to 8.31 Cylinder head cover screw 2 9.81 to 11.2 1.00 to 1.15 7.24 to 8.31 *Cylinder head screw 98.1 to 107 10.0 to 11.0...
Page 136: Checking, Disassembling And Servicing
ENGINE M108S, WSM 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING [V3800-CR-TI] (1) Engine Body Compression 1. After warming up the engine, stop it and remove the air cleaner, the muffler, injection pipes, cylinder head covers, overflow pipe, all injectors and all injectors gaskets.
Page 137 ENGINE M108S, WSM Checking Valve Clearance IMPORTANT • Valve clearance must be checked and adjusted when engine is cold. 1. Remove the injection pipes, the cylinder head covers, overflow pipe and injectors. 2. Align the TC mark of flywheel and the convex of flywheel housing timing windows so that the first piston (gear case side) comes to the compression top dead center.
Page 138: Lubricating System
ENGINE M108S, WSM (2) Lubricating System Engine Oil Pressure 1. Remove the oil switch and set a pressure tester (Code No. 07916-32032). 2. Start the engine. After warming up, measure the oil pressure of both idling and rated speeds. 3. If the oil pressure is less than the allowable limit, check the following.
Page 139 ENGINE M108S, WSM Fan Belt Damage and Wear 1. Check the fan belt for damage. 2. If the fan belt is damaged, replace it. 3. Check if the fan belt is worn and sunk in the pulley groove. 4. If the fan belt is nearly worn out and deeply sunk in the pulley groove, replace it.
Page 140: Turbocharger
ENGINE M108S, WSM Thermostat Valve Opening Temperature 1. Push down the thermostat valve and insert a string between the valve and the valve seat. 2. Place the thermostat and a thermostat in a container with water and gradually heat the water.
Page 141: Separating Engine
ENGINE M108S, WSM [2] SEPARATING ENGINE (1) Separating Front Axle Support as a Unit Draining Coolant CAUTION • Never remove the radiator cap until coolant temperature is well below its boiling point. Then loosen cap slightly to the stop to relieve any excess pressure before removing cap completely.
Page 142 ENGINE M108S, WSM Muffler and Bonnet 1. Open the bonnet (2) and disconnect the battery (3) negative terminal and head light 4P connector (7). 2. Remove the bonnet dampers (4) and close the bonnet (2). 3. Remove the bonnet hinge mounting screws (6) through the holes (5) in the upper part of the bonnet.
Page 143 ENGINE M108S, WSM Radiator Hoses, Air Cleaner Hoses and Power Steering Hoses 1. Remove the shield weather strip (1). 2. Disconnect the air cleaner hoses (2), (4) from turbocharger. 3. Disconnect the radiator hose (3). 4. Disconnect the power steering hoses (5) from power steering controller.
Page 144 ENGINE M108S, WSM Propeller Shaft 1. Slide the propeller shaft cover (3) after removing the screw (5). 2. Tap out the spring pins (2) and then slide the coupling (1) to the rear. (When reassembling) • Apply grease to the splines of the propeller shaft (6) and pinion shaft.
Page 145 ENGINE M108S, WSM Air Condenser and Compressor Without discharging the refrigerant from system 1. Remove the air condenser slide stopper (1) and slide out the air condenser (2). 2. Loosen the lock nut (6) and adjusting screw (5) then remove the air compressor belt (8).
Page 146: Separating Engine From Clutch Housing
ENGINE M108S, WSM Front Axle Support as a Unit 1. Check the front axle and clutch housing case are securely mounted on the disassembling stands. 2. Install the front axle rocking restrictor (1) (refer to “8. SPECIAL TOOLS” at “G. GENERAL” section) to the front axle bracket.
Page 147 ENGINE M108S, WSM Separating Engine from Clutch Housing 1. Remove the floor mat (1) and inspection plate (2). 2. Hoist the engine by hoist and chain. 3. Remove the engine mounting screws and nuts, and separate the engine from the clutch housing.
Page 148: Disassembling And Assembling [V3800-Cr-Ti]
ENGINE M108S, WSM [3] DISASSEMBLING AND ASSEMBLING [V3800-CR-TI] (1) External Components Air Cleaner, Muffler and Others 1. Remove the air cleaner and muffler. 2. Remove the fan, fan belt, alternator and starter. (When reassembling) • Check to see that there are no cracks on the belt surface.
Page 149: Exhaust Gas Recirculation (Egr)
ENGINE M108S, WSM Turbocharger 1. Remove the screw (1), (3). 2. Take off the turbocharger assembly (2). (When reassembling) • Replace the gasket with new one. (1) Screw (3) Screw (2) Turbocharger Assembly W1078106 (3) Exhaust Gas Recirculation (EGR) EGR Cooler and EGR Pipe 1.
Page 150: Common Rail System (Crs)
ENGINE M108S, WSM (4) Common Rail System (CRS) Supply Pump 1. Set the No. 4 piston at the compression top dead center. NOTE • When setting the No. 4 piston at the compression top dead center, turn the flywheel counterclockwise and align the mark on the flywheel housing (1) and the TC mark on flywheel (2) temporarily.
Page 151 ENGINE M108S, WSM Supply Pump (Continued) (When reassembling) • Place the supply pump gear with aligning the timing marks between the supply pump gear and idle gear 2 (white temporary mark). • Replace the O-ring (16) of supply pump with new one.
Page 152 ENGINE M108S, WSM Common Rail and Injection Pipes NOTE • Do not loosen the injection pipe retaining nut when the fuel pressure is high. • Do not remove the pressure limiter (5) and the rail pressure sensor (3) from the common rail (2).
Page 153 ENGINE M108S, WSM Intake Air Temperature Sensor 1. Remove the intake air temperature sensor (1). (When reassembling) • Replace the gasket with new one. 30 to 39 N·m Intake air temperature Tightening torque 3.0 to 4.0 kgf·m sensor 22 to 28 lbf·ft...
Page 154 ENGINE M108S, WSM Crankshaft Position Sensor 1. Remove the crankshaft position sensor mounting screw (2). 2. Remove the crankshaft position sensor (1). (When reassembling) • Replace the O-ring with new one. IMPORTANT • Do not reuse the crankshaft position sensor if you drop the sensor.
Page 155: Cylinder Head And Valves
ENGINE M108S, WSM (5) Cylinder Head and Valves Cylinder Head Covers and Injectors 1. Remove the coupler (1) from injectors harness (2). 2. Remove the cylinder head cover 2 (3). 3. Mark the injector’s terminal (4) and current lead (5) one side for preventing misconnection.
Page 156 ENGINE M108S, WSM Cylinder Head Covers and Injectors (Continued) (When reassembling) • Replace the injectors’ gaskets with new ones. • When you set the injector’s clamp (9), make sure that the steel balls sit on the rocker arm bracket. • Securely tighten the injector’s clamp nuts to the specified torque.
Page 157 ENGINE M108S, WSM Rocker Arm and Push Rod 1. Remove the rocker arm (1) as a unit. 2. Remove the push rods (3). 3. Remove the bridge arm (2). (When reassembling) • When putting the push rods (3) onto the tappets (4), check to see if their ends are properly engaged with the grooves.
Page 158 ENGINE M108S, WSM Cylinder Head and Tappet 1. Loosen the pipe band, and remove the water return hose (1). 2. Disconnect the fuel hose (2) first and then the fuel filter (3). 3. Remove the IN. / EX. Manifold. 4. Remove the cylinder head screw in the order of (18) to (1), and remove the cylinder head.
Page 159 ENGINE M108S, WSM Selecting Cylinder Head Gasket Replacing the Cylinder Head Gasket 1. Make sure to note the notch (a), (b) or (c) of cylinder head gasket (1) in advance. 2. Replace the same notch (a), (b) or (c) as the original cylinder head gasket (1).
Page 160: Thermostat
ENGINE M108S, WSM (6) Thermostat Thermostat Assembly 1. Remove the thermostat cover mounting screws, and remove the thermostat cover (1). 2. Remove the thermostat assembly (3). (When reassembling) • Apply a liquid gasket (Three Bond 1215 or equivalent) only at the thermostat cover side of the gasket (2).
Page 161: Water Pump And Oil Cooler
ENGINE M108S, WSM (8) Water Pump and Oil Cooler Water Pump 1. Remove the pipe band and the water pipe (1). 2. Remove the water pump (2). (When reassembling) • When mounting the water pump, take care not to forget mounting the O-ring and not to let it out of position.
Page 162: Gear Case And Timing Gears
ENGINE M108S, WSM (9) Gear Case and Timing Gears Gear Case Cover 1. Remove the gear case cover. (When reassembling) • Confirm that the liquid gasket coating surface is free of water, dust and oil in order to maintain sealing effect.
Page 163 ENGINE M108S, WSM Camshaft and Balancer Shaft 1. Remove the camshaft position pulsar gear (1). 2. Remove the camshaft set screws and draw out the camshaft (2). 3. Remove the balancer shaft 1 set screws and draw out the balancer shaft 1 (3).
Page 164: Piston And Connecting Rod
ENGINE M108S, WSM Plate (Gear Case) 1. Remove the three plate mounting screws(1). Detach the plate (2). (When reassembling) • Apply Three Bond 1217D adhesive or equivalent over the shaded zones on both sides of the gasket that will be sandwiched between the crankcase and plate.
Page 165 ENGINE M108S, WSM Connecting Rod Cap 1. Remove the connecting rod screws (1) from connecting rod cap. 2. Remove the connecting rod caps. (When reassembling) • Align the marks (a) with each other. (Face the marks toward the injection pump.) •...
Page 166 ENGINE M108S, WSM Piston Ring and Connecting Rod 1. Remove the piston rings using a piston ring tool. 2. Remove the piston pin (8), and separate the connecting rod (7) from the piston (6). (When reassembling) • Be sure the crankpin bearing and the connecting rod are same I.D.
Page 167: Flywheel And Crankshaft
ENGINE M108S, WSM (11) Flywheel and Crankshaft Flywheel 1. Fix the crankshaft not to turn. 2. Remove the crankshaft position sensor (1). 3. Remove the flywheel screws. 4. Remove the flywheel. NOTE • Do not use an impact wrench. Serious damage will occur.
Page 168 ENGINE M108S, WSM Measuring the Gap of Angles between Crankshaft Mechanical Top Dead Center and Crankshaft Position Sensor’s Electrical Top Dead Center 1. Remove the cylinder head covers, injectors, and rocker arm bracket. 2. Set the No. 4 piston at top dead center.
Page 169 ENGINE M108S, WSM Measuring the Gap of Angles between Crankshaft Mechanical Top Dead Center and Crankshaft Position Sensor’s Electrical Top Dead Center (Continued) 9. Connect the engine harness (10) and main switch (13). 10.Connect the battery. 11.Set a circuit tester (12) on the output terminal (white lead) and ground terminal (black lead) of crankshaft position sensor (11).
Page 170 ENGINE M108S, WSM Flywheel Housing 1. Remove the flywheel housing. (When reassembling) • Apply liquid gasket (Three Bond 1217D or equipment) to flywheel housing. • Confirm that the liquid gasket coating surface is free of water, dust and oil in order to maintain sealing effect.
Page 171 ENGINE M108S, WSM Crankcase 1 and Crankcase 2 (When reassembling) • Match the crankcase 1 and 2, referring to the flywheel housing’s contoured face. • Tighten the crankcase 2 mounting screws loosely. • Tighten up the flywheel housing to the specified torque. This helps to minimize the level difference between the crankcase 1 and the crankcase 2 (at the flywheel side).
Page 172 ENGINE M108S, WSM Crankshaft 1. Remove the main bearing case. 2. Remove the crankshaft. (When reassembling) • Reassemble the main bearing case having the same number as the one engraved on the crankcase, and set the casting mark “F / W SIDE” on the main bearing case facing towards the flywheel side.
Page 173: Servicing
ENGINE M108S, WSM [4] SERVICING (1) Cylinder Head Top Clearance 1. Remove the cylinder head (remove the cylinder head gasket completely). 2. Bring the piston to its top dead center fasten 1.5 mm dia. 5 to 7 mm long fuse wires to 3 to 4 spots on the piston top with grease so as to avoid the intake and exhaust valves and the combustion chamber ports.
Page 174 ENGINE M108S, WSM Cylinder Head Flaw 1. Prepare an air spray red check. 2. Clean the surface of the cylinder head with the detergent (2). 3. Spray the cylinder head surface with the red permeative liquid (1). Leave it five to ten minutes after spraying.
Page 175 ENGINE M108S, WSM Clearance between Valve Stem and Valve Guide 1. Remove carbon from the valve guide section. 2. Measure the valve stem O.D. with an outside micrometer. 3. Measure the valve guide I.D. of the cylinder head at the most wear part as shown in the figure below with a small hole gauge.
Page 176 ENGINE M108S, WSM Correcting Valve and Valve Seat NOTE • Before correcting the valve and seat, check the valve stem and the I.D. of valve guide section, and repair them if necessary. • After correcting the valve seat, be sure to check the valve recessing.
Page 177 ENGINE M108S, WSM Free Length and Tilt of Valve Spring 1. Measure the free length (B) with vernier calipers. If the measurement is less than the allowable limit, replace it. 2. Put the spring on a surface plate, place a square on the side of the spring, and check to see if the entire side is contact with the square.
Page 178 ENGINE M108S, WSM Push Rod Alignment 1. Place the push rod on V blocks. 2. Measure the push rod alignment. 3. If the measurement exceeds the allowable limit, replace the push rod. 0.25 mm Push rod alignment Allowable limit 0.0098 in.
Page 179: Timing Gears
ENGINE M108S, WSM (2) Timing Gears Timing Gear Backlash 1. Set a dial indicator (lever type) with its tip on the gear tooth. 2. Move the gear to measure the backlash, holding its mating gear. 3. If the backlash exceeds the allowable limit, check the oil clearance of the shafts and the gear.
Page 180 ENGINE M108S, WSM Camshaft Alignment 1. Support the camshaft with V block on the surface plate and set a dial indicator with its tip on the intermediate journal at right angle. 2. Rotate the camshaft on the V blocks and get the misalignment (half of the measurement).
Page 181 ENGINE M108S, WSM Oil Clearance between Idle Gear Shaft 1, 2 and Idle Gear 1, 2 Bushing 1. Measure the idle gear shaft O.D. with an outside micrometer. 2. Measure the idle gear bushings I.D. with an inside micrometer, and calculate the oil clearance.
Page 182: Piston And Connecting Rod
ENGINE M108S, WSM Oil Clearance of Balancer Shaft Journal 1. Measure the balancer shaft journal O.D. with an outside micrometer. 2. Measure the cylinder block bore I.D. (A), (B) for balancer shaft with an inside micrometer. 3. If the clearance exceeds the allowable limit, replace the balancer shaft.
Page 183 ENGINE M108S, WSM Connecting Rod Alignment NOTE • Since the I.D. of the connecting rod small end bushing is the basis of this check, check the bushing for wear beforehand. 1. Remove the piston pin from the piston. 2. Install the piston pin in the connecting rod.
Page 184: Crankshaft
ENGINE M108S, WSM (4) Crankshaft Crankshaft Side Clearance 1. Set a dial indicator with its tip on the end of the crankshaft. 2. Measure the side clearance by moving the crankshaft to the front and rear. 3. If the measurement exceeds the allowable limit, replace the thrust bearings.
Page 185 ENGINE M108S, WSM Oil Clearance between Crankpin and Crankpin Bearing 1. Clean the crankpin and crankpin bearing. 2. Put a strip of plastigage on the center of the crankpin. 3. Install the connecting rod cap and tighten the connecting rod screws to the specified torque, and remove the cap again.
Page 186 ENGINE M108S, WSM Oil Clearance between Crankshaft Journal and Crankshaft Bearing 1. Clean the crankshaft journal and crankshaft bearing. 2. Put a strip of press gauge on the center of the journal. IMPORTANT • Never insert the press gauge into the oil hole of the journal.
Page 187: Cylinder
ENGINE M108S, WSM (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 188 ENGINE M108S, WSM Clearance between Outer Rotor and Pump Body 1. Measure the clearance between the outer rotor and the pump body with a feeler gauge. 2. If the clearance exceeds the allowable limit, replace the oil pump rotor assembly.
Page 189 CLUTCH KiSC issued 05, 2012 A...
Page 190 MECHANISM CONTENTS 1. TRAVELING CLUTCH .................. 2-M1 [1] STRUCTURE ................... 2-M1 [2] OIL FLOW ....................2-M2 2. PTO CLUTCH ....................2-M3 [1] STRUCTURE ................... 2-M3 [2] OPERATION .................... 2-M4 KiSC issued 05, 2012 A...
Page 191: Traveling Clutch
CLUTCH M108S, WSM 1. TRAVELING CLUTCH [1] STRUCTURE (1) Clutch Pedal (3) Hydraulic Shuttle Valve (5) Reverse Side Clutch (7) Damper Disc (2) Clutch Cable (4) Return Spring (6) Forward Side Clutch The damper disc (7) helps ease the shock load when engaging the shuttle clutch.
Page 192: Oil Flow
CLUTCH M108S, WSM [2] OIL FLOW (1) Shuttle Valve (2) Regulator Valve (3) Shuttle Lever (4) Clutch Pedal (5) Forward Clutch (6) Reverse Clutch (7) Spool (A) From Pump (B) To PTO Clutch (C) To Power Steering W1012813 The oil from regulator valve (2) flows into the shuttle valve (1).
Page 193: Pto Clutch
CLUTCH M108S, WSM 2. PTO CLUTCH [1] STRUCTURE The PTO shift lever (1) and the PTO clutch valve (3) are connected by the PTO shift cable (2) as shown in the figure. When the PTO shift lever (1) is moved to the B side, the PTO clutch valve (3) is set at “Engaged”...
Page 194: Operation
CLUTCH M108S, WSM [2] OPERATION PTO Valve This valve change the oil flow to PTO clutch. This is rotated by the PTO operation lever via to PTO clutch cable. The oil from the regulator valve passes through orifice (1) and flow to the PTO clutch.
Page 195 SERVICING CONTENTS 1. TROUBLESHOOTING ..................2-S1 2. SERVICING SPECIFICATION ...............2-S2 3. TIGHTENING TORQUES ................2-S3 4. CHECKING, DISASSEMBLING AND SERVICING........2-S4 [1] CHECKING AND ADJUSTING ...............2-S4 (1) Traveling Clutch ..................2-S4 (2) PTO Clutch ..................2-S6 [2] DISASSEMBLING AND ASSEMBLING..........2-S8 (1) Removing Damper Disc ..............2-S8 (2) Removing Shuttle Clutch Valve ............2-S14 (3) Removing PTO Clutch Valve ............2-S15 (4) Removing Clutch Pack..............2-S17...
Page 196: Troubleshooting
CLUTCH M108S, WSM 1. TROUBLESHOOTING TRAVELING CLUTCH Reference Symptom Probable Cause Solution Page Shuttle Clutch Slip Operating pressure is low Adjust 3-S11 Shuttle clutch valve malfunctioning Replace 2-S14 Clutch disc or steel plate excessively worn Replace 3-S39 Deformation of piston or steel plate...
Page 197: Servicing Specification
CLUTCH M108S, WSM 2. SERVICING SPECIFICATION TRAVELING CLUTCH Item Factory Specification Allowable Limit Clutch Pedal Free Travel Below 15 mm – 0.59 in. Total Stroke 150 to 155 mm – 5.91 to 6.10 in. Damper Disc Boss to Gear Shaft Backlash –...
Page 198: Tightening Torques
CLUTCH M108S, WSM 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts : Refer to “5. TIGHTENING TORQUES” at “G.GENERAL” section) Item N·m kgf·m lbf·ft...
Page 199: Checking, Disassembling And Servicing
CLUTCH M108S, WSM 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING (1) Traveling Clutch Clutch Pedal Stroke 1. Stop the engine and remove the key. 2. Screw the lock nuts (1), (2) to the threaded end of cable as shown in figure.
Page 200 CLUTCH M108S, WSM Clutch Pedal Free Travel NOTE • Before checking the clutch pedal free travel A, be sure to adjust the pedal stroke. 1. Measure the clutch pedal free travel. 2. If adjustment is needed, loosen the lock nuts (1) and adjust the cable length within acceptable limits.
Page 201: Pto Clutch
CLUTCH M108S, WSM (2) PTO Clutch PTO Clutch Lever Movement 1. Stop the engine and remove the key. 2. Check the PTO clutch lever (1) on the “Engage” and “Disengage” position of PTO clutch lever guide. 3. If the adjustment is needed, loosen the lock nuts (3) and adjust the clutch control cable (2) length.
Page 202 CLUTCH M108S, WSM PTO System Pressure 1. Start the engine and warm up the transmission fluid, and then stop the engine. 2. Remove the plug (4) (PT 1/8) on the PTO valve spool (5). 3. Set the adaptor (PT 1/8) (Use the oil pressure tester for diesel engines, Code No.
Page 203: Disassembling And Assembling
CLUTCH M108S, WSM [2] DISASSEMBLING AND ASSEMBLING (1) Removing Damper Disc Draining Coolant CAUTION • Never remove the radiator cap until coolant temperature is well below its boiling point. Then loosen cap slightly to the stop to relieve any excess pressure before removing cap completely.
Page 204 CLUTCH M108S, WSM Battery and ECU 1. Remove the battery (1). 2. Remove the ECU cover (2). 3. Remove the ECU mounting screws and ECU (3). NOTE • Take care not to damage to ECU. (1) Battery (3) ECU (2) ECU Cover...
Page 205 CLUTCH M108S, WSM Differential Lock Spring 1. Loosen the lock nut (1) and disconnect spring (2) from differential lock lever (3). (When reassembling) • Be sure to fix the front edge of differential lock cable at the center of thread.
Page 206 CLUTCH M108S, WSM Air Condenser and Compressor Without discharging the refrigerant from system 1. Remove the air condenser slide stopper (1) and slide out the air condenser (2). 2. Loosen the lock nut (6) and adjusting screw (5) then remove the air compressor belt (8).
Page 207 CLUTCH M108S, WSM Brake Oil Tank, Joint Shaft and Power Steering Hose 1. Remove the brake oil tank (1). 2. Remove the power steering delivery hose (2). 3. Remove the joint shaft (3). (When reassembling) 22 to 27 N·m Power steering turning Tightening torque 2.2 to 2.8 kgf·m...
Page 208 CLUTCH M108S, WSM Separating Engine from Clutch Housing 1. Check the engine and clutch housing case are securely mounted on the disassembling stands. 2. Install the front axle rocking restrictor (1) (refer to “8. SPECIAL TOOLS” at “G. GENERAL” section) to the front axle bracket.
Page 209: Removing Shuttle Clutch Valve
CLUTCH M108S, WSM Damper Disc 1. Remove the damper disc (1). (When reassembling) • Confirm that the bearing (2) is surely assembled to the flywheel. • Direct the shorter end of the damper disc boss toward the flywheel. • Apply molybdenum disulphide (Three Bond 1901 or equivalent) to the shaft A.
Page 210: Removing Pto Clutch Valve
CLUTCH M108S, WSM (3) Removing PTO Clutch Valve Gear Pump and Pump Base Assembly 1. Remove the seat (1) and floor cover (2). 2. Remove the floor mat (3) and inspection plate under the floor mat. 3. Remove the delivery pipe 1 (4) and delivery pipe 2 (5).
Page 211 CLUTCH M108S, WSM PTO Valve 1. Remove the both hydraulic pumps (1). 2. Remove the cap (2) and internal snap ring (3). 3. Remove the spring pin (4) and then tap out the pin (5). 4. Remove the all gears.
Page 212: Removing Clutch Pack
CLUTCH M108S, WSM (4) Removing Clutch Pack Draining Transmission Fluid 1. Place oil pan underneath the transmission case. 2. Remove the drain plugs (1). 3. Drain the transmission fluid. 4. Reinstall the drain plugs (1). (When reassembling) • Fill up from filling port (3) after removing the filling plug up to the upper notch on the dipstick (2).
Page 213 CLUTCH M108S, WSM Fuel Tank and Auxiliary Step 1. Remove the auxiliary steps (1), (2). 2. Disconnect the 2P connector fuel tank unit (3). 3. Disconnect the fuel tank connector hose between left and right side fuel tanks. 4. Remove the fuel tank bands (4).
Page 214 CLUTCH M108S, WSM Separating Transmission Case 1. Remove the dual speed HI clutch pipe (4) and LO clutch pipe (5). (DS model only.) 2. Remove the resonator pipe (9). 3. Remove the parking brake cable stay (6). 4. Remove the delivery pipe (8).
Page 215 CLUTCH M108S, WSM Rear Cover Assembly 1. Remove the rear cover and PTO drive shaft as a unit. (When reassembling) 78 to 90 N·m Rear cover mounting Tightening torque 7.9 to 9.2 kgf·m screw 58 to 66 lbf·ft W1023232 PTO Clutch Assembly 1.
Page 216: Servicing
CLUTCH M108S, WSM [3] SERVICING (1) Damper Disc Backlash between Damper Disc Boss and Shaft 1. Mount the damper disc to the input shaft. 2. Hold the shaft so that it does not turn. 3. Rotate disc lightly and measure the displacement around the disc edge.
Page 217 CLUTCH M108S, WSM Flatness of PTO Piston, Return Plate and Plate Assembly 1. Plate the PTO piston (1), return plate (2) and plate assembly (3) on a surface plate. 2. Insert a thickness gauge (allowable limit size) underneath it at least four points.
Page 218 TRANSMISSION KiSC issued 05, 2012 A...
Page 219 MECHANISM CONTENTS 1. STRUCTURE ....................3-M1 [1] DS MODEL ..................... 3-M1 2. SHUTTLE SHIFT MECHANISM..............3-M2 [1] SHUTTLE SHIFT SECTION ..............3-M2 [2] REGULATOR VALVE ................3-M3 (1) Structure and Oil Flow ............... 3-M3 [3] HYDRAULIC SHUTTLE VALVE ............3-M4 (1) Structure ....................
Page 220: Structure
M108S, WSM TRANSMISSION 1. STRUCTURE [1] DS MODEL 3TMACBB3P001A (1) Shuttle Shift Section (2) Main Gear Shift Section (3) Swing Shift (Hi-Lo) Section (4) Dual Speed Section (Hi-Lo) (5) PTO Clutch Section (6) PTO Gear Section (7) Range Gear Shift Section...
Page 221: Shuttle Shift Mechanism
TRANSMISSION M108S, WSM 2. SHUTTLE SHIFT MECHANISM [1] SHUTTLE SHIFT SECTION Forward Shift Input shaft (3) → clutch body (11) → forward clutch pack (5) → 29T gear (6). Reverse Shift Input shaft (3) → clutch body (11) → reverse clutch pack (4) →...
Page 222: Regulator Valve
TRANSMISSION M108S, WSM [2] REGULATOR VALVE (1) Structure and Oil Flow (1) Flow Priority Valve (5) Adjusting Screw (Pressure A : From Hydraulic Pump E : To Power Steering Controller (2) Pressure Reducing Valve Reducing Valve) B : To Shuttle Clutch Pack for...
Page 223: Hydraulic Shuttle Valve
TRANSMISSION M108S, WSM [3] HYDRAULIC SHUTTLE VALVE (1) Structure (1) Shuttle Valve (7) Inching Valve Spool (c) Shuttle Forward Position B : Pressure Check Port (2) Accumulator (8) Modulating Valve (d) Shuttle Neutral Position (Reverse) (3) Shuttle Shift Spool (Forward,...
Page 224: Operation
TRANSMISSION M108S, WSM (2) Operation Shuttle Lever at Neutral Position 3-M5 KiSC issued 05, 2012 A...
Page 225 TRANSMISSION M108S, WSM (1) Modulating Valve (5) Shuttle Valve A : Check Port (Modulation) T1 to T5: To Transmission Case (2) Proportionally Reducing Valve (6) Inching Valve B : Check Port (Reverse) N1 : Port N1 (3) Shuttle Shift Spool (Forward,...
Page 226 TRANSMISSION M108S, WSM When Shuttle Lever is Shifting Neutral to Reverse or Forward Position (Clutch Pedal is Released) 3-M7 KiSC issued 05, 2012 A...
Page 227 TRANSMISSION M108S, WSM (1) Modulating Valve (5) Shuttle Valve A : Check Port (Modulation) T1 to T5: To Transmission Case (2) Proportionally Reducing Valve (6) Inching Valve B : Check Port (Reverse) N1 : Port N1 (3) Shuttle Shift Spool (Forward,...
Page 228 TRANSMISSION M108S, WSM Shuttle Lever at Reverse Position (Clutch Pedal is Released) 3-M9 KiSC issued 05, 2012 A...
Page 229 TRANSMISSION M108S, WSM (1) Modulating Valve (5) Shuttle Valve A : Check Port (Modulation) T1 to T5: To Transmission Case (2) Proportionally Reducing Valve (6) Inching Valve B : Check Port (Reverse) N1 : Port N1 (3) Shuttle Shift Spool (Forward,...
Page 230 TRANSMISSION M108S, WSM Shuttle Lever at Forward Position (Clutch Pedal is Released) 3-M11 KiSC issued 05, 2012 A...
Page 231 TRANSMISSION M108S, WSM (1) Modulating Valve (5) Shuttle Valve A : Check Port (Modulation) T1 to T5: To Transmission Case (2) Proportionally Reducing Valve (6) Inching Valve B : Check Port (Reverse) N1 : Port N1 (3) Shuttle Shift Spool (Forward,...
Page 232 TRANSMISSION M108S, WSM When Clutch Pedal is Depressed (with Shuttle Lever at Reverse or Forward Position) 3-M13 KiSC issued 05, 2012 A...
Page 233 TRANSMISSION M108S, WSM (1) Modulating Valve (6) Inching Valve D : Check Port (Pump) a : Connect to Shuttle Lever (2) Proportionally Reducing Valve (7) Shuttle Lever F : To Clutch Body (Forward) b : Connect to Clutch Pedal (3) Shuttle Shift Spool (Forward,...
Page 234: Gear Shift Mechanism
TRANSMISSION M108S, WSM 3. GEAR SHIFT MECHANISM [1] SELECTING THE TRAVELING SPEED (1) Hydraulic Shuttle Shift Lever (5) Pilot Lamp (HIGH) F : Forward R : Reverse (2) Main Gear Shaft Lever (6) Dual Speed Shift Switch N : “Neutral” Position...
Page 235: Main Gear Shift Lever
TRANSMISSION M108S, WSM [2] MAIN GEAR SHIFT LEVER Main Gear Shift Lever Linkage 1. 8 speed can be selected by the main gear shift lever (1) and all speeds are fully synchronized to shift without stopping. 2. The main shift rod 1 (2), link arm (6) and main shift rod...
Page 236 TRANSMISSION M108S, WSM Shift Fork Rod and Fork (1) 3rd-4th Shift Fork Rod (2) 1st-2nd Shift Fork Rod (3) Shaft (4) 3rd-4th Shift Fork (5) Interlock Ball (6) Detent Ball (7) Safety Switch (8) Spring (9) Cam (10) Select Lever...
Page 237: Swing Shift
TRANSMISSION M108S, WSM [3] SWING SHIFT Operation Method 1. The swing shift is a method which the HI and LO speed range is changing by using the electric and hydraulic device combination. 2. The main gear shift lever is in Neutral position during the engine is running.
Page 238 TRANSMISSION M108S, WSM Electrical Device (1) Swing Shift Switch (5) HI Motion Switch A : To Meter Panel (10A Fuse) C : To Meter Panel (2) LO Solenoid Valve (6) Buzzer Relay B : To OPC Unit (Swing Shift HI)
Page 239 TRANSMISSION M108S, WSM Hydraulic Device 1. The shift fork rod (1) is used as a double acting piston. 2. The shift fork rod (1) is moved to the right or left by switching the solenoid valve (2), (3) and flowing oil into A chamber (4) or B chamber (5).
Page 240: Dual Speed
TRANSMISSION M108S, WSM [4] DUAL SPEED Dual Speed Model M108S-DS have dual speed device as a standard equipment. The dual speed device consists of the HI-LO clutch, located in the mid case, and the clutch valve that controls the HI-LO clutch.
Page 241: Dual Speed Valve
TRANSMISSION M108S, WSM 4. DUAL SPEED VALVE This valve change the oil flow to the dual speed HI clutch or LO clutch. As the pilot valve DS (4), (5) operates by energizing the solenoid valve (6), the flow of oil is switched to the HI side or LO side of dual speed clutch with DS spool (3).
Page 242: Power Train For Traveling Gear
TRANSMISSION M108S, WSM 5. POWER TRAIN FOR TRAVELING GEAR [1] MAIN GEAR SHIFT AND SWING SHIFT (LO-HI) SECTION (1) Main Shaft (2) 19T Gear (3) Shifter (4) 22T Gear (5) 28T Gear (6) 31T-18T Gear (7) Counter Shaft (8) Shifter...
Page 243: Dual Speed Section
TRANSMISSION M108S, WSM [2] DUAL SPEED SECTION The dual speed clutch is controlled by the combination of the solenoid valve and the hydraulic flow. When the dual speed shift switch is pushed and indicator comes on, LO speed clutch (4) is engaged.
Page 244: Four-Wheel Drive Section
TRANSMISSION M108S, WSM [4] FOUR-WHEEL DRIVE SECTION (1) 2WD-4WD Shift Section (1) 32T Gear (3) 30T Gear (5) Transmitting Shaft (Center) (7) Transmitting Shaft (Front) (2) Spiral Bevel Pinion Shaft (4) Transmitting Shaft (Rear) (6) 4WD Clutch The 4WD hydraulic clutch is mounted between the transmitting shaft (front) and transmitting shaft (center) in the clutch housing.
Page 245: Power Train For Pto System
TRANSMISSION M108S, WSM 6. POWER TRAIN FOR PTO SYSTEM [1] PTO GEAR SECTION PTO system is live PTO (Independent PTO) which has its own clutch controls completely separated from the travelling clutch and transmission. Therefore, the PTO can operate while the tractor is stopped and also the PTO can be disengaged and engaged while the tractor is moving.
Page 246 SERVICING CONTENTS 1. TROUBLESHOOTING ..................3-S1 2. SERVICING SPECIFICATIONS ..............3-S3 3. TIGHTENING TORQUES ................3-S5 4. CHECKING AND ADJUSTING ..............3-S6 [1] SHUTTLE LEVER ..................3-S6 (1) Hydraulic Shuttle Model ..............3-S6 (2) Engine Start Condition ................3-S8 [2] MAIN GEAR SHIFT.................3-S9 [3] RANGE SHIFT LEVER .................3-S10 [4] HYDRAULIC SHUTTLE OPERATING PRESSURE ......3-S11 [5] DUAL SPEED / 4WD OPERATING PRESSURE ........3-S13 5.
Page 247: Troubleshooting
TRANSMISSION M108S, WSM 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Excessive Transmission fluid insufficient Replenish Transmission Noise Improper backlash between bevel pinion shaft Repair 3-S45 and spiral bevel gear Improper backlash between differential pinion Adjust 3-S48 and side gear...
Page 248 TRANSMISSION M108S, WSM Reference Symptom Probable Cause Solution Page Gears Clash When Synchronizer unit damaged Repair or replace 3-S38 Shifting Clutch does not release Adjust 2-S5 Differential Lock Can Differential lock shift fork damage Replace 3-S33 Not Be Set Differential lock shift fork mounting spring pin...
Page 249: Servicing Specifications
TRANSMISSION M108S, WSM 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Shuttle Rod Length 65 mm – 2.6 in. Main Shift Rod 1 Length 489 mm – 19.3 in. Main Shift Rod 2 Length 120 mm – (Initial adjustment) 4.72 in.
Page 250 TRANSMISSION M108S, WSM Item Factory Specification Allowable Limit Piston Flatness – 0.15 mm 0.0059 in. Internal Snap Ring and Pressure Plate Clearance 1.5 to 2.0 mm 3.5 mm (4WD Clutch) 0.059 to 0.079 in. 0.138 in. Drive Plate (4WD Clutch) Thickness 1.7 to 1.8 mm...
Page 251: Tightening Torques
TRANSMISSION M108S, WSM 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts : Refer to “5. TIGHTENING TORQUES” at “G.GENERAL” section.) Item N·m kgf·m lbf·ft...
Page 252: Checking And Adjusting
TRANSMISSION M108S, WSM 4. CHECKING AND ADJUSTING [1] SHUTTLE LEVER (1) Hydraulic Shuttle Model CAUTION • Park the machine on a firm, flat and level surface, set the parking brake and place the gear shift in neutral. • Stop the engine and remove the key before checking and adjusting.
Page 253 TRANSMISSION M108S, WSM Adjusting Shuttle Valve Neutral Position and Lever Guide Neutral Position (Continued) 7. Shift the free play “D” toward the forward direction and slowly lower the shuttle lever as shown in the figure. And visually inspect the clearance “X”.
Page 254: Engine Start Condition
TRANSMISSION M108S, WSM (2) Engine Start Condition Engine Start Condition IMPORTANT • Before starting the engine, make sure the main gear shift lever at the neutral position. • Place the PTO lever to the OFF position. • Apply the parking brake.
Page 255: Main Gear Shift
TRANSMISSION M108S, WSM [2] MAIN GEAR SHIFT Checking Function of Main Gear Shift and Swing Shift (HI-LO) 1. Check the function of the main gear shift and swing shift (HI-LO). - Neutral position to 1st gear position. - Neutral position to 2nd gear position.
Page 256: Range Shift Lever
TRANSMISSION M108S, WSM [3] RANGE SHIFT LEVER Check Function of Range Shift 1. Check the function of the range gear shift. - Hi and Lo position. 2. If feeling abnormal shifting, check the length of range gear shift rod (2).
Page 257: Hydraulic Shuttle Operating Pressure
TRANSMISSION M108S, WSM [4] HYDRAULIC SHUTTLE OPERATING PRESSURE Checking of System Pressure 1. Remove the floor mat and inspection plate under the mat. 2. Remove the each plugs of F, R, M and set the adaptor D (1), threaded joint, cable (3), and pressure gauge (Code No.: 07916- 52961) (2).
Page 258 TRANSMISSION M108S, WSM Checking Regulator Valve Setting Pressure 1. Remove the plug (4) and set the adaptor D, threaded joint, cable and pressure gauge. 2. Start the engine and set the engine at maximum speed. 3. Check the regulator valve setting pressure.
Page 259: Dual Speed / 4Wd Operating Pressure
TRANSMISSION M108S, WSM [5] DUAL SPEED / 4WD OPERATING PRESSURE Checking of Operating Pressure 1. Starting the engine and warm up the transmission fluid, and then stop the engine. 2. Remove the each plugs of A, B, C, D and set the adaptor (PT 1/ 8) (use the oil pressure tester for diesel engine : Code No.
Page 260: Disassembling And Assembling
TRANSMISSION M108S, WSM 5. DISASSEMBLING AND ASSEMBLING [1] SEPARATING EACH BLOCK (CLUTCH HOUSING CASE TRANSMISSION CASE) Draining Transmission Fluid 1. Place oil pan underneath the transmission case. 2. Remove the drain plugs (1). 3. Drain the transmission fluid. 4. Reinstall the drain plugs (1).
Page 261 TRANSMISSION M108S, WSM Propeller Shaft 1. Slide the propeller shaft cover (3) after removing the screw (5). 2. Tap out the spring pins (2) and then slide the coupling (1) to the rear. (When reassembling) • Apply grease to the splines of the propeller shaft (6) and pinion shaft.
Page 262 TRANSMISSION M108S, WSM Fuel Tank and Auxiliary Step 1. Remove the auxiliary steps (1), (2). 2. Disconnect the 2P connector fuel tank unit (3). 3. Disconnect the fuel tank connector hose between left and right side fuel tanks. 4. Remove the fuel tank bands (4).
Page 263 TRANSMISSION M108S, WSM Gear Pump and Pump Base 1. Remove the suction pipes (1). 2. Remove the delivery pipes (2). 3. Remove the PTO pipe (3). 4. Remove the pump base with gear pumps. (When reassembling) • Replace the oil pipes with new ones and apply oil to them.
Page 264 TRANSMISSION M108S, WSM Dismounting Hydraulic Cylinder Assembly 1. Remove the hydraulic cylinder assembly mounting screws and nut. Support the hydraulic cylinder assembly (1) with nylon lift strap and hoist, and then remove it. 2. Dismounting the hydraulic cylinder assembly from transmission.
Page 265: Disassembling Shuttle Case
TRANSMISSION M108S, WSM [2] DISASSEMBLING SHUTTLE CASE Shuttle Case Assembly CAUTION • The shuttle case assembly is heavy, so that take care it when handling. 1. Remove the screws and nut. 2. Remove the shuttle case assembly (1) by using M8 x Pitch 1.25 screws into holes A and B.
Page 266 TRANSMISSION M108S, WSM Shuttle Clutch Assembly 1. Remove the internal snap ring (1). 2. Remove the pressure plate (2), drive plates (3), (4) and clutch discs (5). 3. Remove the bearing (12). 4. Press the thrust collar (13) lightly with hand press, using hydraulic clutch spring compressor (15) (refer to “8.
Page 267: Disassembling Speed Change Cover
TRANSMISSION M108S, WSM [3] DISASSEMBLING SPEED CHANGE COVER Speed Change Cover 1. Remove the shuttle valve (1). 2. Remove the speed change cover (2). (When reassembling) • When reassembling the speed change cover (2) to clutch housing, set the 1-2 shift fork (4), 3-4 shift fork (5) and shifter in the transmission on neutral position, and Hi-Lo shift fork (3) and shifter in the transmission on Lo side.
Page 268 TRANSMISSION M108S, WSM Hi-Lo Shift Fork 1. Remove the Hi and Lo monitor switch (9). 2. Remove the internal snap ring (1) and seal cap (2). 3. Remove the spring pin (4). 4. Remove the fork rod (3) by using M6 x Pitch 1 screw into the thread (10).
Page 269 TRANSMISSION M108S, WSM Shift Fork and Fork Rod 1. Set the both shift fork on neutral position. 2. Remove the both safety switches (10) on 1-2 shift fork rod (8) and 3-4 shift fork rod (7). 3. Remove the spring pin (3), (4).
Page 270: Disassembling Clutch Housing
TRANSMISSION M108S, WSM [4] DISASSEMBLING CLUTCH HOUSING Bearing Support and Main Shaft 1. Remove the bearing retainers (1). 2. Remove the external snap ring (2). 3. Tap out the main shaft (6) to the rear. 4. Remove the bearing support (5) by M8 x Pitch 1.25 screws into holes (A), (B).
Page 271 TRANSMISSION M108S, WSM Counter Shaft 1. Tap out the counter shaft (1) to front through the hole of clutch hub (2). 2. Remove the external snap ring (3), then tap in the clutch hub (2) with bearing to the clutch housing.
Page 272 TRANSMISSION M108S, WSM Transmitting Shaft and Clutch Assembly 1. Install M6 x Pitch 1 mm screw on to the oil pipe (19) and pull out the oil pipes (19) by hand. 2. Remove the bearing support (front) mounting screws and remove the bearing support (8) with transmitting shaft (front) (12) by screwing M8 screws into holes (A).
Page 273 TRANSMISSION M108S, WSM Hydraulic Clutch (4WD) Assembly 1. Remove the internal snap ring (1). 2. Take out the pressure plate (2), clutch discs (3) and drive plates (4). 3. Remove the external snap ring (5) with the clutch compression tool.
Page 274: Disassembling Mid Case
TRANSMISSION M108S, WSM [5] DISASSEMBLING MID CASE Bearing Support and Dual Speed Clutch 1. Tap out the 27T gear shaft (2) and 25T gear shaft (4) with bearing (3) together. 2. Remove the bearing (6) and external snap ring (5).
Page 275 TRANSMISSION M108S, WSM Dual Speed Clutch Assembly 1. Remove the thrust collar (1) at LO clutch side. 2. Remove the internal snap ring (2). 3. Take out the pressure plate (3), clutch disc (4) and drive plate (5). 4. Press the spring retainer plate (6) lightly with clutch compression tool (8) (refer to “8.
Page 276: Disassembling Hi-Lo Shift Gear Case (Creep Gear Case)
TRANSMISSION M108S, WSM [6] DISASSEMBLING HI-LO SHIFT GEAR CASE (CREEP GEAR CASE) Hi-Lo Shift Gear Case 1. Remove the HI-LO shift gear case mounting screws. 2. Remove the HI-LO shift gear case (1) by using M6 x Pitch 1 screws into holes A and B.
Page 277: Disassembling Pto Gear Case
TRANSMISSION M108S, WSM [7] DISASSEMBLING PTO GEAR CASE Rear Cover Assembly 1. Remove the rear cover and PTO drive shaft as a unit. (When reassembling) 78 to 90 N·m Rear cover mounting Tightening torque 7.9 to 9.2 kgf·m screw 58 to 66 lbf·ft...
Page 278: Disassembling Differential Gear
TRANSMISSION M108S, WSM [8] DISASSEMBLING DIFFERENTIAL GEAR Shift Fork and Shift Rod 1. Remove the HI-LO shift case mounting screws. 2. Remove the HI-LO shift case (4) by M6 x Pitch 1 screws in to the holes. 3. Remove the HI-LO shift fork (3) with fork rod (2) after removing the fork rod setting screws (6).
Page 279 TRANSMISSION M108S, WSM PTO Clutch Assembly 1. Remove the bearing retainer (1). 2. Tap out the coupling (2) with bearing to the rear. 3. Remove the internal snap ring (3). 4. Remove the external snap ring (4). 5. Tap out the PTO clutch shaft (5) to the front and remove the PTO clutch assembly (6).
Page 280 TRANSMISSION M108S, WSM Differential Gear Assembly 1. Remove the differential support (1), (5), noting the number of left and right shims (2), (4). 2. Take out the differential gear assembly (3) from transmission case. (When reassembling) • Be sure to adjust the turning torque of spiral bevel pinion shaft and differential assembly combined.
Page 281 TRANSMISSION M108S, WSM Taper Roller Bearing 1. Place the differential cover (1) on the vise. 2. Tap out the taper roller bearing (2) from the inside of the differential cap, taking care not to damage the outer race and separator.
Page 282 TRANSMISSION M108S, WSM Spiral Bevel Pinion Shaft 1. Remove the stake of the staking nut (1). 2. Set the pinion locking tool (2) (Code No. 07916-52311). 3. Remove the staking nut (1). 4. Tap out the bevel pinion shaft (3) to the rear.
Page 283: Disassembling Rear Drive Shaft (Parking Brake Shaft)
TRANSMISSION M108S, WSM [9] DISASSEMBLING REAR DRIVE SHAFT (PARKING BRAKE SHAFT) Rear Drive Shaft 1. Remove the parking brake case assembly (1) from transmission case. 2. Remove the bearing retainer (2), (3). 3. Tap out the rear drive shaft (4) to front.
Page 284: Servicing
TRANSMISSION M108S, WSM 6. SERVICING [1] BEARING, SHIFT FORK AND SYNCHRONIZER 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 285: Shuttle Clutch
TRANSMISSION M108S, WSM [2] SHUTTLE CLUTCH Clearance between Internal Snap Ring and Pressure Plate 1. Measure the clearance between internal snap ring and pressure plate with a feeler gauge while applying the specified force. Specified force : 177 to 294 N (18.0 to 30.0 kgf, 39.7 to 66.1 lbf).
Page 286: Thrust Clearance On Shaft
TRANSMISSION M108S, WSM [3] THRUST CLEARANCE ON SHAFT Checking side clearance on Main Shaft Gear 1. Measure the side clearance between thrust bearing and bearing washer. 2. If the measurement is not within the factory specifications, adjust the clearance with shim on the front end of main shaft.
Page 287: Dual Speed Clutch
TRANSMISSION M108S, WSM [4] DUAL SPEED CLUTCH Clearance between Internal Snap Ring and Pressure Plate 1. Measure the clearance between internal snap ring and pressure plate with a feeler gauge while applying the specified force. Specified force: 177 to 294 N (18.0 to 30.0 kgf, 39.7 to 66.1 lbf).
Page 288: 4Wd Clutch
TRANSMISSION M108S, WSM [5] 4WD CLUTCH Clearance between Internal Snap Ring and Pressure Plate 4WD Clutch 1.5 to 2.0 mm Factory spec. Clearance between 0.059 to 0.079 in. internal snap ring and 3.5 mm pressure plate Allowable limit 0.138 in.
Page 289: Differential Gear
TRANSMISSION M108S, WSM [6] DIFFERENTIAL GEAR IMPORTANT • When reassembling spiral bevel pinion shaft and differential assembly, be sure to adjust the following. • Turning torque of spiral bevel pinion shaft only. • Turning torque of spiral bevel pinion shaft and differential assembly combined.
Page 290 TRANSMISSION M108S, WSM Turning torque of Spiral Bevel Pinion Shaft and Differential Assembly Combined 1. Reassemble the differential assembly with left shims (2) and right shims (1) same as before assembling. 2. Check that there is a backlash. If there is no backlash, remove a right shim (1) and add a left shim (2).
Page 291 TRANSMISSION M108S, WSM 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 (1) and moving the spiral bevel gear (2) by hand.
Page 292 TRANSMISSION M108S, WSM • Proper Contact 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 W1049310 • Shallow or Heel Contact Replace the adjusting collar (5) with thicker one to move the spiral bevel pinion shaft backward.
Page 293 TRANSMISSION M108S, WSM Clearance between Differential Case Bore (Differential Case Cover Bore) and Differential Side Gear Boss 1. Measure the bore I.D. of the differential case and differential case cover. 2. Measure the differential side gear boss O.D. and calculate the clearance.
Page 294 TRANSMISSION M108S, WSM Backlash between Differential Pinion and Differential Side Gear 1. Set a dial indicator (lever type) on the tooth of the differential pinion. 2. Hold the differential side gear and move the differential pinion to measure the backlash.
Page 295: Rear Axle
REAR AXLE KiSC issued 05, 2012 A...
Page 296 MECHANISM CONTENTS 1. STRUCTURE ....................4-M1 KiSC issued 05, 2012 A...
Page 297 REAR AXLE M108S, WSM 1. STRUCTURE (1) Rear Axle (5) 56T Internal Gear (9) Differential Side Gear (13) Differential Lock (2) Rear Axle Case (6) 21T Planetary Gear (10) Differential Pinion Gear (14) Brake Case (3) Planetary Gear Support (7) Differential Lock Shift Fork...
Page 298 SERVICING CONTENTS 1. TROUBLESHOOTING ..................4-S1 2. SERVICING SPECIFICATIONS ..............4-S2 3. TIGHTENING TORQUES ................4-S3 4. CHECKING, DISASSEMBLING AND SERVICING........4-S4 [1] DISASSEMBLING AND ASSEMBLING..........4-S4 (1) Separating Rear Axle Case from Transmission ........4-S4 (2) Disassembling Rear Axle Case ............4-S7 [2] SERVICING ....................4-S9 KiSC issued 05, 2012 A...
Page 299: Troubleshooting
REAR AXLE M108S, WSM 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Excessive or Improper backlash between brake shaft’s 12T Replace – Unusual Noise at All gear and planetary gear Time Improper backlash between planetary gear and Replace 4-S7, 9...
Page 300: Servicing Specifications
REAR AXLE M108S, WSM 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Internal Gear to Planetary Gear Backlash 0.10 to 0.20 mm 0.50 mm 0.0040 to 0.0078 in. 0.020 in. Planetary Gear Thrust Collar Thickness 1.55 to 1.65 mm 1.2 mm 0.0611 to 0.0649 in.
Page 301: Tightening Torques
REAR AXLE M108S, WSM 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts : Refer to “5. TIGHTENING TORQUES” at “G.GENERAL” section.) Item N·m kgf·m lbf·ft...
Page 302: Checking, Disassembling And Servicing
REAR AXLE M108S, WSM 4. CHECKING, DISASSEMBLING AND SERVICING [1] DISASSEMBLING AND ASSEMBLING (1) Separating Rear Axle Case from Transmission Draining Transmission Fluid 1. Place oil pan underneath the transmission case. 2. Remove the drain plugs (1). 3. Drain the transmission fluid.
Page 303 REAR AXLE M108S, WSM Rear Wheel and 3-Points Hitch 1. Set the front axle rocking restrictor (refer to “8. SPECIAL TOOLS” at “G. GENERAL” section) (1) to the front axle. 2. Place the disassembling stand under the transmission case. 3. Remove the rear wheel (2).
Page 304 REAR AXLE M108S, WSM Cabin Mount Bracket Rear 1. Remove the cabin mounting screw and nut (1). 2. Hoist the cabin. 3. Remove the stabilizer bracket (2). 4. Raise the cabin until the rear bracket becomes free to move. 5. Remove the rear bracket (3).
Page 305: Disassembling Rear Axle Case
REAR AXLE M108S, WSM (2) Disassembling Rear Axle Case Planetary Gear Support 1. Remove the planetary gear support mounting UBS screw (1). 2. Remove the planetary gear support (2). (When reassembling) 90.3 to 103 N·m Planetary gear support Tightening torque 9.20 to 10.6 kgf·m...
Page 306 REAR AXLE M108S, WSM Rear Axle Nut 1. Fix the rear axle on the repair table or set to the rear wheel. 2. Remove the stake on the rear axle nut. 3. Remove the rear axle nut with a rear axle nut wrench 98 (Code No.
Page 307: Servicing
REAR AXLE M108S, WSM [2] SERVICING Backlash between Internal Gear and Planetary Gear 1. Set a dial indicator (lever type) on the tooth of the planetary gear. 2. Hold the planetary gear support and move only the planetary gear to measure the backlash.
Page 308 BRAKES KiSC issued 05, 2012 A...
Page 309 MECHANISM CONTENTS 1. TRAVELLING BRAKE................... 5-M1 2. HYDRAULIC TRAILER BRAKE VALVE............5-M2 [1] STRUCTURE ................... 5-M2 [2] OPERATION .................... 5-M3 KiSC issued 05, 2012 A...
Page 310: Travelling Brake
BRAKES M108S, WSM 1. TRAVELLING BRAKE The travelling brake is a hydraulic wet disc type, which consists of the master cylinder (10), equalizer (12), brake pipe (8), brake oil reservoir (11) and others. This type provides high and stable braking effect and requires almost no adjustment.
Page 311: Hydraulic Trailer Brake Valve
BRAKES M108S, WSM 2. HYDRAULIC TRAILER BRAKE VALVE [1] STRUCTURE Main Elements • Flow control valve (10) with throttle (9) and restrictor (11) : for controlling the delivery flow Qp and for regulating the fluid flow for the trailer brake.
Page 312: Operation
BRAKES M108S, WSM [2] OPERATION Tractor Brake Released The tractor service brake line X is pressureless. The brake line B is relieved to the reservoir through the control spool (2) and port R. The delivery flow Qp of the pump flows from port P past flow control valve (10), the flow Qp - Qx continues through port N to the tractor hydraulics.
Page 313 BRAKES M108S, WSM Partial Braking of Trailer Brake - Initiation Piston (7) of control head (6) is pressurized through control line X from the tractor service brake. Control spool (2) is thus shifted to the left and separates from the reservoir first brake line B and then bore (8).
Page 314 BRAKES M108S, WSM Partial Braking of Trailer Brake The trailer braking pressure Pb (acting on surface (1) of control spool (2)) is in equilibrium with the tractor braking pressure Px (acting on piston (7)). The brake line B remains separated from the reservoir and the oil in the trailer brake is thus enclosed.
Page 315 BRAKES M108S, WSM Maximum Braking of Trailer Brake - Braking Pressure Limited Flow control valve (10) and control spool (2) have the same spool positions (a and d) as in the case of partial braking. The fluid flows Qp and Qx pass as with partial braking.
Page 316 SERVICING CONTENTS 1. TROUBLESHOOTING ..................5-S1 2. SERVICING SPECIFICATIONS ..............5-S2 3. TIGHTENING TORQUES ................5-S3 4. CHECKING, DISASSEMBLING AND SERVICING........5-S4 [1] CHECKING AND ADJUSTING ...............5-S4 [2] DISASSEMBLING AND ASSEMBLING..........5-S8 (1) Removing Brake Pedal ...............5-S8 (2) Removing Master Cylinder and Equalizer...........5-S9 (3) Removing Brake Case ..............5-S11 (4) Removing Parking Brake Case ............5-S14 [3] SERVICING ....................5-S15 KiSC issued 05, 2012 A...
Page 317: Troubleshooting
BRAKES M108S, WSM 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Poor Braking Force Brake pedal free travel excessive Adjust 5-S4 Brake disc worn Replace 5-S16 Brake piston warped Replace 5-S15 Brake oil insufficient or improper Replenish or change with specified oil...
Page 318: Servicing Specifications
BRAKES M108S, WSM 2. SERVICING SPECIFICATIONS TRAVELING BRAKE Item Factory Specification Allowable Limit Brake Pedal Play 7.0 to 14 mm – 0.28 to 0.55 in. Right and Left Less than 100 mm – (Stroke) 3.94 in. Difference 0 to 5.0 mm –...
Page 319: Tightening Torques
BRAKES M108S, WSM 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts : Refer to “5. TIGHTENING TORQUES” at “G.GENERAL” section.) Item N·m kgf·m lbf·ft...
Page 320: Checking, Disassembling And Servicing
BRAKES M108S, WSM 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING Adjusting Brake Pedal 1) Brake Pedal Free Travel CAUTION • When checking, parking the tractor on flat ground, and stop the engine. 1. Measure the free travel by depressing the brake pedals.
Page 321 BRAKES M108S, WSM 3) Equalizer Working Level 1. Gently step on both the right and left pedals at once with your both feet. Step on the right pedal all the way (the left pedal rises). Measure the level difference between the two pedals.
Page 322 BRAKES M108S, WSM Brake Test 1. Remove the bleeder from brake case and set the hydraulic brake adaptor (Code No. 07916-52970) (1), joint (Code No. 07916- 50401) (2), cable (Code No. 07916-50331) (3) and pressure gauge (Code No. 07916-52961) (4).
Page 323 BRAKES M108S, WSM Bleeding Brake System NOTE • While bleeding, make sure to keep enough brake oil in the brake oil reservoir. 1. Disconnect the brake pipes (1) from the master cylinder. 2. Move the brake pedal up and down by hand. At this time, when raising the pedal, close the master cylinder outlet by a finger, and when lowering, release the finger.
Page 324: Disassembling And Assembling
BRAKES M108S, WSM [2] DISASSEMBLING AND ASSEMBLING (1) Removing Brake Pedal Brake Pedal 1. Remove the meter panel. 2. Remove the bonnet rear. 3. Remove the brake pedal return spring and clevis pin from the turnbuckle of master cylinder. 4. Remove the circlip (4) and spring pin (5) and draw out the brake pedal shaft (1), then remove the left and right brake pedal (2), (3).
Page 325: Removing Master Cylinder And Equalizer
BRAKES M108S, WSM (2) Removing Master Cylinder and Equalizer Removing Master Cylinder and Equalizer Precaution of Disassembling and Assembling for Hydraulic Brake • Wash all parts with clean brake oil (refer to “4. LUBRICANTS, FUEL AND COOLANT” at “G. GENERAL” section).
Page 326 BRAKES M108S, WSM Master Cylinder 1. Drain the brake oil from the master cylinder. 2. Secure the master cylinder in a vise. Remove the push rod (3) and boot (4) as a unit from the master cylinder. 3. Remove the internal snap ring (5), and pull out the piston (6), return spring (7) and outlet valve (8).
Page 327: Removing Brake Case
BRAKES M108S, WSM (3) Removing Brake Case Draining Transmission Fluid 1. Place oil pan underneath the transmission case. 2. Remove the drain plugs (1). 3. Drain the transmission fluid. 4. Reinstall the drain plugs (1). (When reassembling) • Fill up from filling port (3) after removing the filling plug up to the upper notch on the dipstick (2).
Page 328 BRAKES M108S, WSM Rear Wheel and 3-Points Hitch 1. Set the front axle rocking restrictor (refer to “8. SPECIAL TOOLS” at “G. GENERAL” section) (1) to the front axle. 2. Place the disassembling stand under the transmission case. 3. Remove the rear wheel (2).
Page 329 BRAKES M108S, WSM Cabin Mount Bracket Rear 1. Remove the cabin mounting screw and nut (1). 2. Hoist the cabin. 3. Remove the stabilizer bracket (2). 4. Raise the cabin until the rear bracket becomes free to move. 5. Remove the rear bracket (3).
Page 330: Removing Parking Brake Case
BRAKES M108S, WSM (4) Removing Parking Brake Case Draining Transmission Fluid 1. Refer to “4. LUBRICANTS, FUEL AND COOLANT” at “G. GENERAL” section. W1019077 Draining Fuel 1. Refer to “4. LUBRICANTS, FUEL AND COOLANT” at “G. GENERAL” section. W1019123 Parking Brake Case Assembly 1.
Page 331: Servicing
BRAKES M108S, WSM Parking Brake Pad 1. Remove the E snap ring (1), and put out the parking brake camshaft (2) and parking brake cam (3). 2. Straighten the lock plate (4) and loosen the nut (5). 3. Remove the parking brake pads.
Page 332 BRAKES M108S, WSM Brake Disc Wear 1. Measure the brake disc thickness with a vernier caliper. 2. If the measurement is less than the allowable limit, replace it. 4.15 to 4.35 mm Factory spec. 0.164 to 0.171 in. Brake disc wear 3.3 mm...
Page 333: Front Axle
FRONT AXLE KiSC issued 05, 2012 A...
Page 334 MECHANISM CONTENTS 1. STRUCTURE ....................6-M1 [1] 4-WHEEL DRIVE TYPE................. 6-M1 KiSC issued 05, 2012 A...
Page 335 FRONT AXLE M108S, WSM 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 336 SERVICING CONTENTS 1. TROUBLESHOOTING ..................6-S1 2. SERVICING SPECIFICATIONS ..............6-S2 3. TIGHTENING TORQUES ................6-S3 4. CHECKING, DISASSEMBLING AND SERVICING........6-S4 [1] CHECKING AND ADJUSTING ...............6-S4 [2] DISASSEMBLING AND ASSEMBLING..........6-S6 (1) Separating Front Axle [4WD Type] .............6-S6 (2) Disassembling Front Axle [4WD Type] ..........6-S10 [3] SERVICING ....................6-S17 (1) 4WD Type ..................6-S17 KiSC issued 05, 2012 A...
Page 337: Troubleshooting
FRONT AXLE M108S, WSM 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Front Wheels Tire pressure uneven Adjust G-69 Wander to Right or Improper toe-in adjustment (improper alignment) Adjust 6-S4 Left Clearance between front axle case boss and Replace 6-S19...
Page 338: Servicing Specifications
FRONT AXLE M108S, WSM 2. SERVICING SPECIFICATIONS [4WD TYPE] Item Factory Specification Allowable Limit Front Wheel Alignment Toe-in 2.0 to 8.0 mm – 0.079 to 0.31 in. Front Wheel Axle Sway 5.0 mm – 0.20 in. Steering Angle 0.84 to 0.87 rad –...
Page 339: Tightening Torques
FRONT AXLE M108S, WSM 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts : Refer to “5. TIGHTENING TORQUES” at “G.GENERAL” section.) [4WD] Item N·m kgf·m...
Page 340: Checking, Disassembling And Servicing
FRONT AXLE M108S, WSM 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING Adjusting Toe-in 1. Park tractor on a flat place. 2. Turn steering wheel so that front wheels are in the straight ahead position. 3. Lower the implement, lock the park brake and stop the engine.
Page 341 FRONT AXLE M108S, WSM Adjusting Front Axle Pivot 1. Jack up the tractor body, then loosen the lock nut (2). 2. Measure the adjusting screw tightening torque. 3. If tightening torque is not within the factory specifications, adjust the adjusting screw (1).
Page 342: Disassembling And Assembling
FRONT AXLE M108S, WSM Front Wheel Steering Angle 1. Inflate the tires to the specified pressure. 2. Adjust turning angle with the stopper bolts table below. 3. The right side is similarly adjusted. IMPORTANT • Always check if tires contact with tractor or loader frame assemblies.
Page 343 FRONT AXLE M108S, WSM Draining Front Axle Gear Case Oil 1. To drain the used oil, remove the right and left drain plugs (2) and filling plugs (1) at the front axle gear case and drain the oil completely into the oil pan.
Page 344 FRONT AXLE M108S, WSM Front Wheel and Power Steering Hoses 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 345 FRONT AXLE M108S, WSM Front Axle 1. Place a disassembling stand under the front axle bracket and support it with jack. 2. Hoist and hold the front axle with nylon slings. 3. Loosen the lock nut (1) and remove the spring (2) from differential lock lever (3).
Page 346: Disassembling Front Axle [4Wd Type]
FRONT AXLE M108S, WSM (2) Disassembling Front Axle [4WD Type] Tie-rod 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). (When reassembling) • Replace cotter pin with a new one.
Page 347 FRONT AXLE M108S, WSM Bevel Gear Case 1. Separate the bevel gear case (3) from front wheel case (4). 2. Remove the front wheel case support (1). 3. Loosen the bearing retainer (2) mounting screws. 4. Remove the bearing retainer (2) by screwing M8 screw into holes A and B.
Page 348 FRONT AXLE M108S, WSM Front Wheel Case 1. Remove the internal snap ring (13). 2. Remove the cap (12) which is installed in the bottom of front wheel case. 3. Remove the internal snap ring (11) and take out the adjusting shims (10).
Page 349 FRONT AXLE M108S, WSM Planetary Gear 1. Remove the external snap ring (1). 2. Remove the planetary gear support assembly. 3. Tap the spring pin (6) into the planetary gear shaft (5). 4. Draw out the planetary gear shaft (5), and remove the planetary gear (3).
Page 350 FRONT AXLE M108S, WSM Bevel Gear and Differential Yoke Shaft 1. Remove the bevel gear (5), bearing (4) and differential yoke shaft (3) as a unit from the differential case (1). 2. Remove the external snap ring (6) and remove the bevel gear (5).
Page 351 FRONT AXLE M108S, WSM Differential Assembly 1. Remove the plug (2), and tap out the spring pin (3). 2. Draw out the differential lock lever shaft (1). 3. Remove the differential lock lever (4). 4. Remove the bearing support 1 (7) and shim (8) and differential lock clutch 2 (9).
Page 352 FRONT AXLE M108S, WSM Spiral Bevel Gear 1. Remove the spiral bevel gear UBS screws. 2. Tap out the spiral bevel gear (2) from the differential gear case. (When reassembling) • Apply lock tight (Three Bond 1324B or equivalent) to the spiral bevel gear UBS screws.
Page 353: Servicing
FRONT AXLE M108S, WSM [3] SERVICING (1) 4WD Type Backlash and Tooth Contact between Bevel Pinion Shaft and Bevel Gear 1. Set a dial indicator (lever type) with its finger on the tooth surface. 2. Measure the backlash by fixing the bevel pinion shaft (5) and moving the bevel gear (3) by hand.
Page 354 FRONT AXLE M108S, WSM Clearance between Differential Case and Differential Side Gear 1. Measure the differential side gear boss O.D.. 2. Measure the differential case bore I.D., and calculate the clearance. 3. If the clearance exceeds the allowable limit, replace it.
Page 355 FRONT AXLE M108S, WSM Front Bracket and Rear Bracket Bushing 1. Visually inspect the DX bushing for signs of wear or damage. (The DX bushing tends to show concentrated wear.) 2. If the DX bushing is worn beyond the alloy portion (A), replace it.
Page 356 FRONT AXLE M108S, WSM Bevel Gear Case and Front Wheel Case Bushing 1. Visually inspect the DX bushing for signs of wear or damage. (The DX bushing tends to show concentrated wear.) 2. If the DX bushing is worn beyond the alloy portion (A), replace it.
Page 357 FRONT AXLE M108S, WSM Backlash between Internal Gear and Planetary Gear 1. Set a dial indicator (lever type) on the tooth of the planetary gear. 2. Hold the planetary gear support and move only the planetary gear. 3. If the measurement exceeds the allowable limit, check the planetary gear and planetary shaft.
Page 358 FRONT AXLE M108S, WSM Backlash of Bevel Gear in Front Wheel Case 1. Set a dial indicator (lever type) on the shaft (Kingpin). 2. Move the shaft (Kingpin) by hand and measure the circumferential play of the shaft. 3. Calculate the backlash from the ratio of the shaft diameter to the gear diameter.
Page 359 STEERING KiSC issued 05, 2012 A...
Page 360 MECHANISM CONTENTS 1. STRUCTURE ....................7-M1 [1] STEERING MECHANISM............... 7-M1 KiSC issued 05, 2012 A...
Page 361 STEERING M108S, WSM 1. STRUCTURE [1] STEERING MECHANISM This model is provided with a full hydrostatic power steering. Generally power steerings are divided into 4 types: booster type, integral type, semi-integral type and full hydrostatic type. In the full hydrostatic power steering, the steering controller is connected to the steering cylinder with only the hydraulic pipe.
Page 362 SERVICING CONTENTS 1. TROUBLESHOOTING ..................7-S1 2. SERVICING SPECIFICATIONS ..............7-S2 3. TIGHTENING TORQUES ................7-S3 4. CHECKING, DISASSEMBLING AND SERVICING........7-S4 [1] CHECKING AND ADJUSTING ...............7-S4 (1) Hydraulic Pump for Power Steering ............7-S4 (2) Power Steering Relief Valve ...............7-S5 [2] DISASSEMBLING AND ASSEMBLING..........7-S6 (1) Hydraulic Pump...................7-S6 (2) Removing Steering Controller .............7-S8 (3) Removing Steering Cylinder ...............7-S9...
Page 363: Troubleshooting
STEERING M108S, WSM 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Tractor Cannot Be Drive shaft in the steering controller improperly Reassemble 7-S10 Steered assembled Turning delivery hose damaged Replace 7-S8 Hard Steering Oil improper Change with specified oil Hydraulic pump malfunctioning...
Page 364: Servicing Specifications
STEERING M108S, WSM 2. SERVICING SPECIFICATIONS HYDRAULIC PUMP FOR POWER STEERING Item Factory Specification Allowable Limit Hydraulic Pump Delivery Above 39.1 L/min. 48.9 L/min. 10.3 U.S.gals./min. 12.9 U.S.gals./min. 8.6 Imp.gals./min. 10.8 Imp.gals./min. Housing Bore Depth of Scratch – 0.090 mm 0.0035 in.
Page 365: Tightening Torques
STEERING M108S, WSM 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts : Refer to “5. TIGHTENING TORQUES” at “G.GENERAL” section.) Item N·m kgf·m lbf·ft...
Page 366: Checking, Disassembling And Servicing
STEERING M108S, WSM 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING (1) Hydraulic Pump for Power Steering Hydraulic Flow Test IMPORTANT • When using flowmeter other than KUBOTA specified flowmeter, be sure to use the instructions with the flowmeter.
Page 367: Power Steering Relief Valve
STEERING M108S, WSM Hydraulic Flow Test (Continued) Condition • Engine speed : Approx. 2600 min (rpm) • Rated pressure : 16.5 MPa 168 kgf/cm 2390 psi • Oil temperature : 45 to 55 °C 113 to 131 °F 48.9 L/min.
Page 368: Disassembling And Assembling
STEERING M108S, WSM [2] DISASSEMBLING AND ASSEMBLING (1) Hydraulic Pump Removing Hydraulic Pump 1. Remove the floor mat (1) and inspection plate under the mat. 2. Remove the seat (2) and floor cover (3). 3. Disconnect the delivery pipe 1 (4) and delivery pipe (5).
Page 369 STEERING M108S, WSM Disassembling Hydraulic Pump 1. Put parting marks (A), (B) on the front cover (3), body (7) and housing rear cover (9). 2. Remove the housing rear cover (9) and body (7). 3. Remove the side plate (5).
Page 370: Removing Steering Controller
STEERING M108S, WSM (2) Removing Steering Controller Bonnet and Muffler Pipe 1. Remove the bonnet (2) and muffler pipe (1). (1) Maffler Pipe (2) Bonnet W1011906 Hose and Pipe for Steering 1. Disconnect the main delivery hose (2). 2. Disconnect the turning delivery hoses (5).
Page 371: Removing Steering Cylinder
STEERING M108S, WSM (3) Removing Steering Cylinder Tie-rod 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). (When reassembling) • Replace cotter pin with a new one.
Page 372: Steering Controller Assembly
STEERING M108S, WSM (4) Steering Controller Assembly Relief Valve Assembly 1. Remove the adjust plug (3) and draw out the spring (2) and poppet (1). (When reassembling) • Take care not to damage the O-ring. IMPORTANT • After disassembling and assembling the relief valve, be sure to adjust the relief valve setting pressure.
Page 373 STEERING M108S, WSM Grand Seal, Needle Bearing, Sleeve and Spool 1. Remove the retaining ring (1) with a screw driver. 2. Hold the control valve unit vertically and spool and sleeve align the cross pin parallels to flat side of housing (flow priority valve mounting side), the cross pin is visible through open end of spool.
Page 374: Steering Cylinder
STEERING M108S, WSM Sleeve and Spool 1. Draw out the dowel pin (1). 2. Draw out the spool (3) from the sleeve (2). 3. Push out the centering spring (4). IMPORTANT • As the clearance between the sleeve (2) and spool (3) is very narrow, draw out the spool by turning it slowly with due care.
Page 375: Servicing
STEERING M108S, WSM [3] SERVICING (1) Hydraulic Pump Housing Bore 1. Measure the housing I.D. where the interior surface is not scratched, and measure the housing I.D. where the interior surface is scratched. 2. If the values obtained in the two determinations differ by more than the allowable limit, replace the hydraulic pump as a unit.
Page 376 HYDRAULIC SYSTEM KiSC issued 05, 2012 A...
Page 377 MECHANISM CONTENTS 1. STRUCTURE ....................8-M1 2. HYDRUALIC CIRCUIT .................. 8-M3 [1] HYDRAULIC CIRCUIT................8-M4 [2] CONTROL VALVE .................. 8-M5 [3] POSITION CONTROL ................8-M7 KiSC issued 05, 2012 A...
Page 378: Structure
(10) Oil Cooler (13) Oil Filter Cartridge The hydraulic system of M108S tractor is composed of three point hitch, remote hydraulic control for implements, power steering, PTO clutch, shuttle clutch, swing shift and dual speed shown above. This system has following functions.
Page 379 HYDRAULIC SYSTEM M108S, WSM 6. To operate swing shift HI-LO. The swing shift (HI-LO) is controlled by the combination of solenoid valve and hydraulic flow. Two ways of power train are available low speed range and high speed range of travelling speed.
Page 380: Hydrualic Circuit
HYDRAULIC SYSTEM M108S, WSM 2. HYDRUALIC CIRCUIT (1) Auxiliary Control Valve (8) Hydraulic Oil Filter Cartridge (13) Hydraulic Cylinder (21) Solenoid Valve (2) Control Valve for 3P (9) Hydraulic Pump (for 3P) (14) Regulator Valve (22) Dual Speed Clutch HI...
Page 381: Hydraulic Circuit
HYDRAULIC SYSTEM M108S, WSM [1] HYDRAULIC CIRCUIT (1) Oil Tank (Transmission Case) (2) Hydraulic Oil Filter Cartridge (3) Hydraulic Pump (4) Auxiliary Control Valve (5) Control Valve (6) Relief Valve (7) Lowering Speed Adjusting Valve (8) Hydraulic Cylinder (9) Cylinder Safety Valve...
Page 382: Control Valve
HYDRAULIC SYSTEM M108S, WSM [2] CONTROL VALVE Neutral Pressurized oil from the P port, pushes and opens unload poppet 1 (4) and returns to tank from T1 port. The oil in the chamber A behind the unload poppet 1 (4) returns to the tank through the E of spool (3) and control valve body.
Page 383 HYDRAULIC SYSTEM M108S, WSM Lifting Neutral (Acting shockless mechanism) In returning from Lifting to Neutral, the spool (3) is pushed back to the arrow-mark direction. When the Neutral position comes near, the groove part D of the spool (3) makes the pressure difference at the P port and C port.
Page 384: Position Control
HYDRAULIC SYSTEM M108S, WSM [3] POSITION CONTROL Position control is a system to raise and lower the implement proportionally to the movement of the position control lever. With this system, the implement can be raised or lowered to any position desired by changing the position of the control lever and fine adjustment is also easy.
Page 385 SERVICING CONTENTS 1. TROUBLESHOOTING ..................8-S1 2. SERVICING SPECIFICATIONS ..............8-S2 3. TIGHTENING TORQUES ................8-S4 4. CHECKING, DISASSEMBLING AND SERVICING........8-S5 [1] CHECKING AND ADJUSTING ...............8-S5 (1) Hydraulic Pump for Three-Point Hitch ..........8-S5 (2) Three-Point Hitch System (Relief Valve and Safety Valve) Operating System ....................8-S6 (3) Three-Point Hitch Control Linkage .............8-S7 (4) Auxiliary Control Valve Wire .............8-S10...
Page 386 HYDRAULIC SYSTEM M108S, WSM 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Implement Does Not Control linkage improperly assembled or Repair or replace 8-S7 Rise (Not Noise) damaged Control valve malfunctioning (unload valve, Repair or replace 8-S14, 15 spool, check valve, poppet valve)
Page 387: Servicing Specifications
HYDRAULIC SYSTEM M108S, WSM 2. SERVICING SPECIFICATIONS HYDRAULIC PUMP FOR THREE-POINT HYDRAULIC SYSTEM Item Factory Specification Allowable Limit Hydraulic Pump Delivery Above 53.2 L/min. 66.6 L/min. 14.1 U.S.gals/min. 17.6 U.S.gals/min. 11.7 Imp.gals/min. 14.6 Imp.gals/min. Housing Bore Depth of Scratch –...
Page 388 HYDRAULIC SYSTEM M108S, WSM HYDRAULIC CYLINDER Item Factory Specification Allowable Limit Cylinder Bore I.D. 100.036 to 100.071 mm 100.15 mm 3.93843 to 3.93980 in. 3.9429 in. Hydraulic Arm Shaft to Bushing Clearance (Right) 0.140 to 0.250 mm 0.50 mm 0.00552 to 0.00984 in.
Page 389: Tightening Torques
HYDRAULIC SYSTEM M108S, WSM 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts : Refer to “5. TIGHTENING TORQUES” at “G.GENERAL” section.) Item N·m kgf·m lbf·ft...
Page 390: Checking, Disassembling And Servicing
HYDRAULIC SYSTEM M108S, WSM 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING (1) Hydraulic Pump for Three-Point Hitch Hydraulic Flow Test IMPORTANT • When using flowmeter other than KUBOTA specified flowmeter, be sure to use the instructions with the flowmeter.
Page 391: Three-Point Hitch System (Relief Valve And Safety Valve) Operating System
HYDRAULIC SYSTEM M108S, WSM (2) Three-Point Hitch System (Relief Valve and Safety Valve) Operating System Relief Valve Setting Pressure Test Using Pressure Tester (Coupler) 1. Set the relief valve set pressure adaptor G (Code No. 07916- 52751) to the half male of the quick coupler and then set a pressure gauge (Code No.
Page 392: Three-Point Hitch Control Linkage
HYDRAULIC SYSTEM M108S, WSM (3) Three-Point Hitch Control Linkage Adjusting the Position Rod and Draft Rod 1. Be sure to adjust the position rod length A and draft rod length B. Position rod length A 369 mm Factory spec. and draft rod length B 14.5 in.
Page 393 HYDRAULIC SYSTEM M108S, WSM Adjusting Position Control Lever 1. Attach a weight of approx. 490 N (50 kgf, 110 lbf) to the end of the lower links. 2. Start the engine and set the speed at 1000 min (rpm). 3. Move the draft control lever (2) all the way down and shift the position control lever (1) downward by approx.
Page 394 HYDRAULIC SYSTEM M108S, WSM Adjusting Draft Control Rod 1. Attach a weight of approx. 490 N (50 kgf, 110 lbf) to the end of the lower links. 2. Start the engine and set the speed at 1000 min (rpm). 3. Move the position control lever and draft control lever (1) all the way down.
Page 395: Auxiliary Control Valve Wire
HYDRAULIC SYSTEM M108S, WSM Adjusting Top Link Bracket 1. Measure the clearance (A) between the stopper (3) and top link bracket (1). If the clearance is not within the factory specifications, adjust with the shims (4) between the stopper (3) and top link bracket (1).
Page 396: Disassembling And Assembling
HYDRAULIC SYSTEM M108S, WSM [2] DISASSEMBLING AND ASSEMBLING (1) Hydraulic Pump Removing Hydraulic Pump 1. Remove the floor mat (1) and inspection plate under the mat. 2. Remove the seat (2) and floor cover (3). 3. Disconnect the delivery pipe 1 (4) and delivery pipe (5).
Page 397 HYDRAULIC SYSTEM M108S, WSM Disassembling Hydraulic Pump 1. Put parting marks (A), (B) on the front cover (3), body (7) and housing rear cover (9). 2. Remove the housing rear cover (9) and body (7). 3. Remove the side plate (5).
Page 398: Relief Valve For Three-Point Hitch
HYDRAULIC SYSTEM M108S, WSM (2) Relief Valve for Three-Point Hitch Relief Valve 1. Remove the lock nut (9). 2. Remove the adjuster (8), and draw out the spring (7) and pilot valve (6). 3. Remove the valve seat (1), and draw out the valve seat (4), the spring (3) and the main valve (2).
Page 399: Separating Three-Point Hitch Cylinder Assembly
HYDRAULIC SYSTEM M108S, WSM (4) Separating Three-Point Hitch Cylinder Assembly Preparation 1. Remove the seat and floor seat cover. 2. Remove the delivery pipe (1). 3. Disconnect the auxiliary control wire (3) and position and draft control rod (2). 4. Disconnect the lowering speed control rod (5).
Page 400 HYDRAULIC SYSTEM M108S, WSM Plug and Unload Valve 1. Secure the control valve with a vise. 2. Remove the seat plug 1 (1) for unload poppet 1 (3). 3. Draw out the spring (2) for unload poppet 1 (3). 4. Remove the seat plug 2 (4) for unload poppet 2 (6).
Page 401: Control Valve Linkage
HYDRAULIC SYSTEM M108S, WSM (6) Control Valve Linkage Position and Draft Linkage 1. Remove the clevis pin (2). 2. Remove the circlips (4), (5), (6), (7). 3. Remove the stopper and draw out the rod (3). 4. Remove the stopper and draw out the rod (8). To remove the O- ring (22) and (24) order by c →...
Page 402: Cylinder Assembly
HYDRAULIC SYSTEM M108S, WSM (7) Cylinder Assembly Lift Arm and Hydraulic Arm Shaft 1. Remove the wire and unscrew the setting screw (3). 2. Remove the screw (5) and lift arm L.H. (1). 3. Draw out the hydraulic arm shaft (2) and lift arm R.H. (4) as a unit.
Page 403 HYDRAULIC SYSTEM M108S, WSM Hydraulic Cylinder Cover and Hydraulic Piston 1. Remove the hydraulic cylinder cover (1). 2. Push out the hydraulic piston (5) from the hydraulic cylinder. (When reassembling) • Install the hydraulic piston, noting O-ring (6) and backup ring (7).
Page 404: Servicing
HYDRAULIC SYSTEM M108S, WSM [3] SERVICING (1) Hydraulic Pump Housing Bore 1. Measure the housing I.D. where the interior surface is not scratched, and measure the housing I.D. where the interior surface is scratched. 2. If the values obtained in the two determinations differ by more than the allowable limit, replace the hydraulic pump as a unit.
Page 405 HYDRAULIC SYSTEM M108S, WSM Clearance between Hydraulic Arm Shaft and Bushing 1. Measure the hydraulic arm shaft O.D. with an outside micrometer. 2. Measure the bushing I.D. with a cylinder gauge, and calculate the clearance. 3. If the clearance exceeds the allowable limit, replace the bushing.
Page 406 ELECTRICAL SYSTEM KiSC issued 05, 2012 A...
Page 407 MECHANISM CONTENTS 1. WIRING DIAGRAM ..................9-M1 [1] MAIN HARNESS..................9-M1 [2] ENGINE HARNESS ................9-M2 [3] CRS HARNESS ..................9-M3 [4] BODY HARNESS AND BONNET HARNESS........9-M5 [5] CABIN HARNESS................... 9-M6 2. ELECTRICAL CIRCUIT ................9-M7 [1] FUSE, STARTING SYSTEM AND CHARGING SYSTEM....9-M7 [2] METER PANEL..................
Page 408: Wiring Diagram
M108S, WSM ELECTRICAL SYSTEM 1. WIRING DIAGRAM [1] MAIN HARNESS Brake Oil H-L Shift Combination Cigarette Main Key Switch Meter Panel Switch Buzzer Horn Display Mode Lighter Switch Light Switch To Bonnet Harness Brake Brake Switch DS Lamp Hazard Switch...
Page 409: Engine Harness
M108S, WSM ELECTRICAL SYSTEM [2] ENGINE HARNESS To Main Harness 0.85 B 0.85 B Diode (Compressor) Earth Rear 0.85 Y/L 2.00 B Compressor 0.50 Y/L Magnetic Clutch 0.50 B Earth Front 2.00 B Engine Oil Pressure 0.50 W Switch 0.50 W/R...
Page 410: Crs Harness
M108S, WSM ELECTRICAL SYSTEM [3-1] CRS HARNESS (SERIAL NO. 50001 TO 51561, 70001 TO 70700) Fuse Box Diagnosis CRS Power Relay (CRS Power) Connector Electric To Main Harness Feed Pump 4 3 2 1 2.00 B/R-F To Battery Cable Injector Connector 0.85 BR...
Page 411 M108S, WSM ELECTRICAL SYSTEM [3-2] CRS HARNESS (SERIAL NO. ABOVE 51562 AND ABOVE 70701) Fuse Box Diagnosis Surge Cut Diode CRS Power Relay (CRS Power) Connector Electric To Main Harness Feed Pump 4 3 2 1 2.00 B/R-F To Battery Cable Injector Connector 0.85 BR...
Page 412: Body Harness And Bonnet Harness
M108S, WSM ELECTRICAL SYSTEM [4] BODY HARNESS AND BONNET HARNESS To Body Harness 14 13 12 11 10 9 7 6 5 4 3 2 0.85 W/R Front Side Work Light L.H. 0.85 B 1.25 BR 1.25 OR Head Light L.H.
Page 413: Cabin Harness
M108S, WSM ELECTRICAL SYSTEM [5] CABIN HARNESS Rear Front Rear Wiper Front Wiper Work Light A/C Control Panel Blower Switch Dome Light Beacon Switch Work Light Mode Select Switch Switch Switch Switch Servomotor INT E WV+1 0.50 G/Y 0.50 L/G 0.5 Y...
Page 414: Electrical Circuit
M108S, WSM ELECTRICAL SYSTEM 2. ELECTRICAL CIRCUIT [1] FUSE, STARTING SYSTEM AND CHARGING SYSTEM Slow Blow Fuse Box 2 Flasher/Light 3W/R 3W/R 3W/R Auxiliary Key IG2 5R/B 5R/B 5R/B Blower/Air Con Air Con/Position Position Key ACC Flasher/Light 15W/R Key IG1...
Page 415: Meter Panel
M108S, WSM ELECTRICAL SYSTEM [2] METER PANEL Light Key IG1/IG [Except: -UK] Display Mode Select Switch 0.5R/Y 0.5R/Y 0.5L/B LCD Display Tacho Meter Fuel Meter Temperature Meter Meter Panel 0.5P/W 0.5B/W F-LH 3TMACBB9P020A 9-M8 KiSC issued 05, 2012 A...
Page 416: Swing Shift And Dual Speed System
M108S, WSM ELECTRICAL SYSTEM [3] SWING SHIFT AND DUAL SPEED SYSTEM Key IG1/IG 0.5LG/R 0.5LG/R [CABIN-DS] Shift Hi-Lo Switch 14V1.4W Dual Shift Switch FREE FREE LOCK LOCK 4WD Switch Shift Lo Switch Diode (Buzzer) 0.5BR/L 0.5R/L 0.5R/L 12V1.7W Dual Shift 0.5Y/R...
Page 417 M108S, WSM ELECTRICAL SYSTEM [4-1] COMMON RAIL SYSTEM (CRS) (SERIAL NO. 50001 TO 51561, 70001 TO 70700) ECU (CRS) Shield Cable 0.5R 0.5R 0.5LG/R 0.5LG/R Crankshaft 121 Battery Sensor (Power Supply) 3 Position Sensor 0.5LG/W 0.5LG/W Crankshaft Position Sensor + 2R/B-F 0.5LG/B...
Page 418 M108S, WSM ELECTRICAL SYSTEM [4-2] COMMON RAIL SYSTEM (CRS) (SERIAL NO. ABOVE 51562 AND ABOVE 70701) Surge Cut Diode 0.5R 0.5P/G To Main Key IG Fuse ECU (CRS) Shield Cable 0.5R 0.5R 0.5LG/R 0.5LG/R Crankshaft 121 Battery Sensor (Power Supply) 3 Position Sensor 0.5LG/W...
Page 419: Lighting System
M108S, WSM ELECTRICAL SYSTEM [5] LIGHTING SYSTEM Air Con/Position Flasher/Light Key IG1/IG Steering Assembly Horn Switch 0.85L/W FREE 0.85R/G PUSH 0.85G To Meter Panel 0.85BR 0.85BR 0.5BR Hazard Switch (Hi Beem) 14V1.4W 0.85OR Combination Light Switch FREE LOCK 0.85R/G To Radio (Back Up)
Page 420: Work Light, Radio And Accessory
M108S, WSM ELECTRICAL SYSTEM [6] WORK LIGHT, RADIO AND ACCESSORY Air Con/Position Flasher/Light Key ACC Key IG2 0.5Y/G 0.5Y/B To Compressor Relay To Compressor Relay 0.5Y/B 0.5Y/B 0.5Y/B To Blower Relay 0.5Y/B To Auxiliary Power Relay Work Light Relay 0.5Y/B...
Page 421: Wiper System
M108S, WSM ELECTRICAL SYSTEM [7] WIPER SYSTEM Key IG2 0.85L 0.85L 0.85L Front Wiper Motor Relay 0.85L Front Wiper Motor 0.47 F Front Wiper Switch Rear Wiper Motor 0.85L/Y WV WM 3.0 H WASH 0.85LG/W -EC :Option 0.85LG/B WASH Washer Motor 0.85L...
Page 422: Air Conditioner
M108S, WSM ELECTRICAL SYSTEM [8] AIR CONDITIONER 0.5Y/G To Front Side Work Light Relay Air Con/Def 0.5Y/G 0.5Y/B 0.5Y/B Key IG2 0.5Y/B 0.5Y/B To Auxiliary Power Relay 0.5Y/B To Work Light Relay Servomotor Mode Servomotor Temperature Control Blower Relay Compressor Relay Thermostat 0.5W...
Page 423: Color Of Wiring
ELECTRICAL SYSTEM M108S, WSM [9] COLOR OF WIRING B ... Black Br/Y ..Brown / Yellow R/W .... Red / White G ..Green Br/R ..Brown / Red R/Y ..... Red / Yellow L ... Blue G/B ..Green / Black W/B ....
Page 424: Easy Checker
ELECTRICAL SYSTEM M108S, WSM 3. EASY CHECKER [1] INDICATION ITEMS The operator must check the conditions of the tractor before and during operations. To facilitate checking, the Easy-Checker (TM) lamps on the panel board is provided. Easy Checker (TM) If the warning lamps in the Easy Checker (TM) come on during operation, immediately stop the engine, and find the cause as shown below.
Page 425 ELECTRICAL SYSTEM M108S, WSM Parking brake / Brake oil indicator 1. The warning lamp (5) in the Easy Checker (TM) comes on if the parking brake is applied. If the lamp is on during operation, release the parking brake lever immediately.
Page 426 SERVICING CONTENTS 1. TROUBLESHOOTING ..................9-S1 2. SERVICING SPECIFICATIONS ..............9-S6 3. TIGHTENING TORQUES ................9-S7 4. CHECKING AND ADJUSTING ..............9-S8 [1] BATTERY AND FUSE ................9-S8 (1) Battery....................9-S8 (2) Checking Fuse ..................9-S11 [2] MAIN SWITCH ..................9-S13 (1) Main Switch..................9-S13 (2) Air Heater Relay................9-S14 [3] AIR HEATER..................9-S15 [4] STARTER MOTOR ................9-S15 [5] ALTERNATOR ..................9-S17...
Page 427 ELECTRICAL SYSTEM M108S, WSM 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page All Electrical Battery discharged or defective Recharge or replace 9-S9 Equipments Do Not Battery positive cable disconnected or Repair or replace 9-S8 Operate improperly connected Battery negative cable disconnected or...
Page 428 ELECTRICAL SYSTEM M108S, WSM AIR HEATER Reference Symptom Probable Cause Solution Page Air Heater Does Not Slow blow fuse blown Replace 9-S11, 12 Heat Air heater relay defective Replace 9-S25 Air heater defective Replace 9-S15 W1010808 CHARGING SYSTEM Charging Lamp Does...
Page 429 ELECTRICAL SYSTEM M108S, WSM LIGHTING SYSTEM Reference Symptom Probable Cause Solution Page Head Light Does Not Fuse blown Replace 9-S11, 12 Light Bulb blown Replace – Wiring harness disconnected or improperly Repair or replace – connected (between main switch B terminal and...
Page 430 ELECTRICAL SYSTEM M108S, WSM EASY CHECKER Reference Symptom Probable Cause Solution Page Brake Oil Level / Bulb blown Replace – Parking Brake Brake oil level too low Supply oil 5-S5 Indicator Lamp Does Brake oil level switch defective Replace 9-S35...
Page 431 ELECTRICAL SYSTEM M108S, WSM GAUGES Reference Symptom Probable Cause Solution Page Fuel Gauge Does Not Fuel gauge defective Replace – Function Fuel level sensor (tank unit) defective Replace 9-S36 Wiring harness disconnected or improperly Repair or replace – connected (between panel board and fuel level...
Page 432: Servicing Specifications
ELECTRICAL SYSTEM M108S, WSM 2. SERVICING SPECIFICATIONS STARTER MOTOR Item Factory Specification Allowable Limit Commutator O.D. 32.0 mm 31.4 mm 1.26 in. 1.24 in. Mica Undercut 0.50 to 0.80 mm 0.2 mm 0.020 to 0.031 in. 0.08 in. Brush Length 18.0 mm...
Page 433 ELECTRICAL SYSTEM M108S, WSM 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts : Refer to “5. TIGHTENING TORQUES” at “G.GENERAL” section.) Item N·m kgf·m lbf·ft...
Page 434: Checking And Adjusting
ELECTRICAL SYSTEM M108S, WSM 4. CHECKING AND ADJUSTING [1] BATTERY AND FUSE (1) Battery Battery Voltage 1. Stop the engine and turn the main switch off. 2. Connect the COM (−) lead of the voltmeter to the battery's negative terminal post and the (+) lead to the positive terminal post, and measure the battery voltage.
Page 435 ELECTRICAL SYSTEM M108S, WSM Battery Condition Indicator 1. Check the battery condition by reading the indicator (2). State of indicator display Specific gravity of electrolyte and quality of Green electrolyte are both in good condition. Black Needs charging battery White...
Page 436 ELECTRICAL SYSTEM M108S, WSM Battery Storage 1. When shutting down the tractor for long periods of time, remove the battery from the tractor, store the battery in a well ventilated placed where it is not exposed to direct sunlight. 2. Since the battery self-discharges by approx. 0.5 % per day even in storage, it must be once every two months in cold season.
Page 437: Checking Fuse
ELECTRICAL SYSTEM M108S, WSM (2) Checking Fuse 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 438 ELECTRICAL SYSTEM M108S, WSM Fuse No. Capacity (Ampere) Protected circuit Meter backup 15 A Flasher (Hazard) 15 A Dome light, Brake lamp 15 A Head light 25 A Auxiliary power 15 A Tail / position lamp, Horn 10 A A/C compressor, F/S work light...
Page 439: Main Switch
ELECTRICAL SYSTEM M108S, WSM [2] MAIN SWITCH (1) Main Switch Preparation 1. Remove the meter panel and the main switch connectors after turning the main switch off. 2. Perform the following checking. (1) Main Switch W1016075 Connector Voltage 1. Measure the voltage across the connector B terminal and chassis.
Page 440: Air Heater Relay
ELECTRICAL SYSTEM M108S, WSM Main Switch at START Position 1. Turn and hold the main switch at the START position. 2. Measure the resistances across the B terminal and the IG1 terminal, and across the B terminal, and the ST terminal.
Page 441: Air Heater
ELECTRICAL SYSTEM M108S, WSM [3] AIR HEATER Connector Voltage 1. Disconnect the wiring white color lead (2) from air heater (1) after turning the main switch OFF. 2. Make sure that the shuttle shift lever is in the NEUTRAL position and the PTO control lever is in the OFF position.
Page 442 ELECTRICAL SYSTEM M108S, WSM Motor Test CAUTION • Secure the starter to prevent it from jumping up and down while testing the motor. 1. Disconnect the battery negative cable from the battery. 2. Disconnect the battery positive cable and the leads from the starter C terminal (1).
Page 443: Alternator
ELECTRICAL SYSTEM M108S, WSM [5] ALTERNATOR Preparation 1. Disconnect the 2P connector (3) from alternator after turning the main switch OFF. 2. Perform the following checkings. (1) B Terminal (3) 2P Connector (2) Alternator W1030485 Connector Voltage 1. Turn off the main switch. Measure the voltage between the B terminal (1) and the chassis.
Page 444: Meter Panel
ELECTRICAL SYSTEM M108S, WSM [6] METER PANEL (1) Setting Mode (Select the PTO Display Mode Switching, Tractor Model Select and Entering Travel Speed Coefficient) CAUTION • To perform the meter panel, the operator must be seated on the tractor. LCD Monitor Indication (Setting Mode)
Page 445 ELECTRICAL SYSTEM M108S, WSM PTO Speed Display Mode Switching (Setting Mode) 1. While pressing the PTO/Hour meter select switch (1), turn the key switch to “ON” position. The current numerical code starts flashing. 2. Each time the PTO/Hour meter select switch (1) is pressed, the code changes in the order of [3] →...
Page 446 ELECTRICAL SYSTEM M108S, WSM Entering Traveling Speed Coefficient [Example : Entering 4953 mm] 1. While pressing the traveling speed select switch (2), turn the key switch to “ON” position. The setting of the current tire’s circumference is displayed in inches or millimeters. The highest- digit numeral starts flashing.
Page 447: Lighting Switch And Flasher Unit
ELECTRICAL SYSTEM M108S, WSM [7] LIGHTING SWITCH AND FLASHER UNIT (1) Lever Combination Switch Checking Connector Voltage 1. Disconnect the lever combination switch connector (1). 2. measure the voltage with voltmeter across the connector terminal B1 and chassis, across the terminal B2 and chassis.
Page 448: Hazard Switch
ELECTRICAL SYSTEM M108S, WSM (2) Hazard Switch Checking Connector Voltage 1. Connect the battery negative code, then measure the voltage with a voltmeter across the terminal a and chassis. 2. If the voltage differ from the battery voltage, the wiring harness is faulty.
Page 449: Flasher Unit
ELECTRICAL SYSTEM M108S, WSM (3) Flasher Unit Connector Voltage 1. Disconnect the flasher unit connector. 2. Measure the voltage with voltmeter across the wiring harness connector's terminal 5 and chassis. 3. If the voltage differs from the battery voltage, the wiring harness or fuse is faulty.
Page 450: Work Light Switch
ELECTRICAL SYSTEM M108S, WSM (4) Work Light Switch Preparation 1. Remove the outer roof, and disconnect the working light switch connector (1) from the switch (2) connector. 2. Perform the following checkings “Connector Voltage” and “Working Light Switch”. (1) Working Light Switch Connector...
Page 451: Starter Relay And Heater Relay
ELECTRICAL SYSTEM M108S, WSM [8] RELAYS (1) Starter Relay and Heater Relay Checking Connector Voltage 1. Measure the voltage with a voltmeter across the battery terminal and chassis as table below. 2. If the voltage differs from the battery voltage, the wiring harness or fuse is faulty.
Page 452 ELECTRICAL SYSTEM M108S, WSM (2) Relays (PTO Safety, Work Light, Auxiliary Power and A/C Compressor) Functional Check NOTE • The relays described here are used same ones so that these are interchangeable. 1. Apply battery voltage across the terminals a and c, and check for continuity across the terminals d and e.
Page 453: Switch, Sensor, Injector, Buzzer And Solenoid Valve
ELECTRICAL SYSTEM M108S, WSM [9] SWITCH, SENSOR, INJECTOR, BUZZER AND SOLENOID VALVE (1) Sensor and Injector (Common Rail System) Coolant Temperature Sensor 1. Measure the resistance between terminal (+) and (−). 15.04 kΩ at −20 °C (−4 °F) Coolant temperature 2.45 kΩ...
Page 454 ELECTRICAL SYSTEM M108S, WSM Rail Pressure Sensor 1. Refer to “Diagnosis Manual”. (Code No. 9Y130-00142) NOTE • Do not remove the rail pressure sensor (2) from the common rail (1). (1) Common Rail (2) Rail Pressure Sensor W1041558 Fuel Temperature Sensor 1.
Page 455 ELECTRICAL SYSTEM M108S, WSM Injector and Injector Harness Continuity 1. Check the continuity between terminal (+) and (−) of each injector harness from the coupler of injector harness. 2. If it is not conductive, check the continuity of harness itself and injector itself.
Page 456: Swing Shift
ELECTRICAL SYSTEM M108S, WSM (2) Swing Shift Monitor Switch (LO and HI) 1. Remove the monitor switch (1), (2). 2. Check the continuity with an ohmmeter across switch terminals. 3. If it does not conduct or any value is indicated when the switch is pushed, the switch is faulty.
Page 457 ELECTRICAL SYSTEM M108S, WSM Swing Shift Switch 1. Remove the Hi-Lo touch shift switch (1) connector. 2. Check the continuity with a ohmmeter across the 2 terminal to the 1 terminal, and across the 2 terminal to the 3 terminal.
Page 458 ELECTRICAL SYSTEM M108S, WSM HI-LO Shift Solenoid Valve 1. Disconnect the connector (1). 2. Measure the resistance with an ohmmeter across the 1 terminal to the chassis, and the 2 terminal to the chassis. 3. If infinity is indicated, the solenoid valve is faulty.
Page 459: Dual Speed (Ds Model Only)
ELECTRICAL SYSTEM M108S, WSM (3) Dual Speed (DS Model Only) Dual Speed Indicator 1. Remove the indicator (1) from the side panel. 2. Check the continuity with an ohmmeter across the indicator terminals. 3. If value is indicated, the bulb is faulty.
Page 460: Parking Brake Switch
ELECTRICAL SYSTEM M108S, WSM Dual Speed Solenoid Valve 1. Disconnect the wire harness connector (1). 2. Measure the resistance with an ohmmeter across the 1 terminal on the connector (2) and chassis. 3. If infinity is indicated, the solenoid valve is faulty.
Page 461: Brake Oil Switch
ELECTRICAL SYSTEM M108S, WSM Parking Brake Switch Continuity 1. Check the continuity with an ohmmeter across the switch terminals. 2. If it does not conduct or any value is indicated when the switch is pushed, the switch is faulty. 3. If infinity is not indicated when the switch is released, the switch is faulty.
Page 462: Fuel Level Sensor
ELECTRICAL SYSTEM M108S, WSM (6) Fuel Level Sensor Checking Fuel Level Sensor 1. Remove the fuel level sensor from the fuel tank. 2. Measure the resistance with an ohmmeter across the terminal a and terminal b. 3. If the measurement is not indicated, the sensor is faulty.
Page 463: Engine Oil Pressure Switch
ELECTRICAL SYSTEM M108S, WSM (7) Engine Oil Pressure Switch Engine Oil Pressure Switch Panel Board and Wiring Harness 1. Disconnect the lead (2) from the engine oil pressure switch (1) after turning off the main switch. 2. Turn on the main switch and connect a jumper lead from the lead to the chassis.
Page 464: Pto Switch
ELECTRICAL SYSTEM M108S, WSM (8) PTO Switch PTO Switch 1) Wiring Harness 1. Disconnect the leads from the PTO switch (1). 2. Connect the wiring harness lead terminals to each other and turn the main switch ON. 3. If the indicator does not light, the fuse, wiring harness or bulb is faulty.
Page 465 CABIN KiSC issued 05, 2012 A...
Page 466 MECHANISM CONTENTS 1. AIR CONDITIONING SYSTEM ..............10-M1 [1] STRUCTURE ..................10-M1 [2] COMPRESSOR ..................10-M3 [3] AIR FLOW..................... 10-M4 [4] AIR CONTROL VENT ................10-M4 [5] CONTROL PANEL................10-M6 [6] OPERATION ..................10-M7 [7] ELECTRICAL SYSTEM ..............10-M10 (1) Electrical Circuit ................10-M10 KiSC issued 05, 2012 A...
Page 467: Air Conditioning System
CABIN M108S, WSM 1. AIR CONDITIONING SYSTEM [1] STRUCTURE (1) Heater Hose (4) Outer Roof (7) High Pressure Pipe and Low (9) Condenser (2) Air Conditioner Unit (5) Inner Air Filter Pressure Pipe (10) Compressor (3) Control Unit (6) Fresh Air Filter...
Page 468 CABIN M108S, WSM The machine is equipped with a thin large-capacity air conditioner with outside air intake. The air through the inside air filter (9) as well as the outside air filter (4) and the roof (8) reaches the air conditioner unit (1). The air is cooled and dehumidified by this unit.
Page 469: Compressor
CABIN M108S, WSM [2] COMPRESSOR The vane type compressor installed on this cabin is composed of a cylinder (1) with an oval cross section and a rotor (2) with five vanes (3). The vane type compressor is provided with two suction ports and two discharge ports respectively.
Page 470: Air Flow
CABIN M108S, WSM [3] AIR FLOW Air in the CAB and fresh air introduced into CAB flow as shown below. Adjust the nine air ports to obtain the desired condition. IMPORTANT • Do not pour water directly into the fresh air port while washing the vehicle.
Page 471 CABIN M108S, WSM Door air outlet The door air outlets can be adjusted to direct air on to the door window or the foot area. (1) Door Air Outlet (A) Open (B) Shut (C) Door Window (D) Foot Area W1013941...
Page 472: Control Panel
CABIN M108S, WSM [5] CONTROL PANEL Control panel switch • Mode Switch (2) (a): Air is blown from only the face air outlets. (b): Air is blown from the front, face and door air outlets. (c): Air is blown from the front and door air outlets.
Page 473: Operation
CABIN M108S, WSM [6] OPERATION Heating 1. Set the mode switch (2) to the (a), (b), (c) position. 2. Set the recirculation / fresh air selection lever (4) to the “FRESH AIR” position. To raise the temperature quickly, this lever “RECIRCULATION”...
Page 474 CABIN M108S, WSM Cooling or dehumidifying-heating 1. Set the mode switch to the (a) or (b) position. 2. Set the recirculation / fresh air selection lever to the “FRESH AIR” position. To fall the temperature in the quickly, this lever “RECIRCULATION”...
Page 475 CABIN M108S, WSM Defrosting or demisting To defrost or demist the windshield, take the following steps. 1. Set the mode switch (2) to the (c) position. 2. Open the front air outlet, door air outlet direct it to the windshield.
Page 476: Electrical System
CABIN M108S, WSM [7] ELECTRICAL SYSTEM (1) Electrical Circuit (1) Temperature Control Dial (5) Compressor Relay (9) Blower Motor Switch (13) Mode Select Switch (2) Mode Switch (6) Blower Relay (10) Compressor Magnet Clutch (14) Motor Drive Circuit (3) Thermostat...
Page 477 SERVICING CONTENTS 1. TROUBLESHOOTING ..................10-S1 2. SERVICING SPECIFICATIONS ..............10-S5 3. TIGHTENING TORQUES ................10-S6 4. PRECAUTIONS AT REPAIRING REFRIGERANT CYCLE ......10-S7 [1] HANDLING OF SERVICE TOOLS............10-S8 (1) Manifold Gauge Set ................10-S8 (2) Refrigerant Charging Hose .............10-S10 (3) Vacuum Pump Adaptor..............10-S11 (4) Electric Gas Leak Tester..............10-S11 (5) Can Tap Valve ................10-S12 (6) T-joint ....................10-S12 (7) R134a Refrigerant Recover and Recycling Machine ......10-S12...
Page 478 CABIN M108S, WSM 1. TROUBLESHOOTING COMPRESSOR Reference Symptom Probable Cause Solution Page Noisy Bearing of compressor worn or damaged Replace 10-S39 (Compressor ON) Valves in compressor damaged Replace 10-S39 Belt slipping Adjust or replace G-29 Compressor bracket mounting screws loosen Tighten –...
Page 479 CABIN M108S, WSM AIR CONDITIONING SYSTEM (Continued) Reference Symptom Probable Cause Solution Page Insufficient Cooling Belt slipping Adjust or replace G-29 (Compressor Does Magnetic clutch defective Repair or replace 10-S39, 40 Not Rotate Properly) Compressor defective Replace 10-S39, 40 Insufficient Cooling...
Page 480 CABIN M108S, WSM AIR CONDITIONING SYSTEM (Continued) Reference Symptom Probable Cause Solution Page Insufficient Cooling Refrigerant too short Check with manifold 10-S21 (Hi-pressure Level is gauge Too Low) Low-pressure pipe in trouble (Cracked or Replace – clogged) Insufficient Cooling Refrigerant overcharged...
Page 481 CABIN M108S, WSM WINDSHIELD WIPER Reference Symptom Probable Cause Solution Page Windshield Wiper Fuse blown (Short-circuit, burnt component Correct cause and – Does Not Operate inside motor or other part for operation) replace Wiper motor defective (Broken armature, worn Replace...
Page 482: Servicing Specifications
CABIN M108S, WSM 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit A/C Compressor Magnet Clutch Airgap 0.30 to 0.65 mm – 0.012 to 0.025 in. 3.0 to 4.0 Ω Magnet Clutch Stator Coil Resistance – Refrigerating Cycle Pressure 0.15 to 0.20 MPa –...
Page 483 CABIN M108S, WSM 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts : Refer to “5. TIGHTENING TORQUES” at “G. GENERAL” section.) Item N·m kgf·m lbf·ft...
Page 484: Precautions At Repairing Refrigerant Cycle
CABIN M108S, WSM 4. PRECAUTIONS AT REPAIRING REFRIGERANT CYCLE When checking or repairing the air conditioning system, the following precautions and rules must be observed. And it is of first importance that no other personnel than a well-trained serviceman should be allow to handle the refrigerant.
Page 485: Handling Of Service Tools
CABIN M108S, WSM (Reference) Replacing Parts Replenish Quantity Brand Name 20 cc Condenser 0.021 U.S.qts 0.018 Imp.qts 20 cc Evaporator 0.021 U.S.qts ND-ACEITE 8<PÁG* oil> 0.018 Imp.qts 10 cc Receiver 0.011 U.S.qts 0.009 Imp.qts *PAG : Polyalkyleneglycol (Synthetic oil) W1012709...
Page 486 CABIN M108S, WSM When LO Valve is Closed and HI Valve is Opened Two circuits are established. Port (C) → LO pressure gauge (1) → Port (B) → Port (D) (Schrader valve must be opened) Port (A) → HI pressure gauge (2) NOTE •...
Page 487: Refrigerant Charging Hose
CABIN M108S, WSM (2) Refrigerant Charging Hose The charging hoses are classified into three colors. Each charging hose must be handled as follows : • The air conditioner manufacture recommends that the blue hose (3) is used for the LO pressure side (suction side), the green hose (5) for refrigeration side (center connecting port) and the red hose (4) for HI pressure side (discharged side).
Page 488: Vacuum Pump Adaptor
CABIN M108S, WSM (3) Vacuum Pump Adaptor Objective of the Vacuum Pump Adaptor 1. After vacuum has been created in the air conditioning cycle, when the vacuum pump is stopped, since there is vacuum in hoses within the gauge manifold, the vacuum pump oil flows back into the charging hose.
Page 489: Can Tap Valve
CABIN M108S, WSM (5) Can Tap Valve The can tap valve that is used to charge the refrigerant into the air conditioning system, should be used as follows : 1. Before putting the can tap valve on the refrigerant container, turn the handle (1) counterclockwise till the valve needle is fully retracted.
Page 490: Checking And Charging Refrigerant Cycle
CABIN M108S, WSM 5. CHECKING AND CHARGING REFRIGERANT CYCLE [1] CHECKING WITH MANIFOLD GAUGE IMPORTANT • The gauge indications described in the following testing are those taken under the same condition, so it should be noted that the gauge readings will differs somewhat with the ambient conditions.
Page 491 CABIN M108S, WSM Insufficient Refrigerant 1. Symptoms seen in refrigerating cycle - Both LO and HI pressure side (1), (2) pressures too low. LO pressure side (1) : 0.05 to 0.10 MPa (0.5 to 1.0 kgf/cm , 7.1 to 14.2 psi) HI pressure side (2) : 0.69 to 0.98 MPa...
Page 492 CABIN M108S, WSM Air Entered in the Cycle 1. Symptoms seen in refrigerating cycle - Both LO and HI pressure side (1), (2) pressures too high. LO pressure side (1) : 0.20 to 0.35 MPa (2.0 to 3.5 kgf/cm , 28.4 to 49.8 psi) HI pressure side (2) : 1.96 to 2.45 MPa...
Page 493 CABIN M108S, WSM Refrigerant Fails to Circulate 1. Symptoms seen in refrigerating cycle - LO pressure side (1) pressure is vacuum and, HI pressure side (2) is low pressure. LO pressure side (1) : Vacuum HI pressure side (2) : 0.49 to 0.59 MPa (5 to 6 kgf/cm , 71.2 to 85.3 psi)
Page 494: Discharging Evacuating And Charging
CABIN M108S, WSM Faulty Compression of Compressor 1. Symptoms seen in refrigerating cycle - LO pressure side (1) : 0.39 to 0.59 MPa (4 to 6 kgf/cm , 56.9 to 85.3 psi) - HI pressure side (2) : 0.69 to 0.98 MPa (7 to 10 kgf/cm , 99.6 to 142.2 psi)
Page 495: Evacuating The System
CABIN M108S, WSM (2) Evacuating the System Evacuating the System 1. Discharge refrigerant from the system by R134a refrigerant recovery and recycling machine. (Refer to “(1) Discharging the Refrigerant” in this section.) 2. Connect the charging hose (4) (red) to the HI pressure side charging valve and connect the charging hose (5) (blue) to the LO pressure side charging valve.
Page 496: Charging The Refrigerant
CABIN M108S, WSM (3) Charging the Refrigerant Charging an Empty System (Liquid) This procedure is for charging an empty system through the HI pressure side with the refrigerant in the liquid state. CAUTION • Never run the engine when charging the system through the HI pressure side.
Page 497 CABIN M108S, WSM Charging an Empty or Partially Charged System (Vapor) This procedure is to charge the system through the LO pressure side with refrigerant in the vapor state. When the refrigerant container is placed right side up, refrigerant will enter the system as a vapor.
Page 498: Checking Charge Refrigerant Amount
CABIN M108S, WSM (4) Checking Charge Refrigerant Amount After charging the refrigerant, check for amount of charging refrigerant as follows. NOTE • The pressure on the following checking is the gauge indications at ambient temperature 30 °C (86 °F), so it should be noted that the pressure will differ some what with the ambient temperature.
Page 499: Checking, Disassembling And Servicing
CABIN M108S, WSM 6. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING (1) Compressor Operation of Magnetic Clutch 1. Start the engine. 2. Check whether abrasion of abnormal noise is heard when only the magnetic clutch pulley is running while the A/C switch is turned off.
Page 500: Air Conditioner Unit
CABIN M108S, WSM (2) Air Conditioner Unit Connector Voltage (Blower Relay, Compressor Relay) 1. When turning on the main switch, voltage across the 1 terminal and chassis should be approx. battery voltage. 2. The voltage across the d terminal and chassis should be approx.
Page 501: Blower Switch
CABIN M108S, WSM (3) Blower Switch Connector Voltage 1. Disconnect the blower switch 4P connector. 2. Turn the main switch “ON” position. 3. Measure the voltage with a voltmeter across the connector 3 terminal and 4 terminal. 4. If the voltage differs from the battery voltage, the wiring harness, A/C relay, fuse or main switch is faulty.
Page 502: Blower Motor
CABIN M108S, WSM (4) Blower Motor Blower Motor Test 1. Remove the outer roof. 2. Turn the blower motor (1) by hand and check whether it turns smoothly. 3. Disconnect the connector (2) of blower motor (1). 4. Connect a jumper lead from battery (3) positive terminal to connector B terminal.
Page 503: A/C Switch
CABIN M108S, WSM (6) A/C Switch Connector Voltage 1. Disconnect the A/C switch 3P connector. 2. Turn the main switch “ON” position. 3. Measure the voltage with a voltmeter across the connector 1 terminal and 3 terminal. 4. If the voltage differs from the battery voltage, the wiring harness, A/C relay or fuse is faulty.
Page 504: Mode Switch
CABIN M108S, WSM (7) Mode Switch Mode Switch Check 1. Disconnect the mode switch 4P connector. 2. Check the continuity through the switch with an ohmmeter. 3. If the continuity specified below is not indicated, check the switch. Terminal Position...
Page 505: Temperature Motor
CABIN M108S, WSM (9) Temperature Motor Temperature Motor Check 1. Confirm whether the temperature control dial (2) is defective. (Refer to “(8) Temperature Control Dial” in this section.) 2. Turn the main switch “ACC” position. 3. Turn the blower switch (3) at 1 position.
Page 506: A/C Pressure Switch
CABIN M108S, WSM (11) A/C Pressure Switch HI Pressure Side 1. Connect the manifold gauge (5) to compressor as following procedure. Close the HI and LO pressure valves (3), (4) of manifold gauge tightly, and connect the charging hoses (red and blue) (6), (7) to the respective compressor service valves.
Page 507: Front Wiper Switch
CABIN M108S, WSM LO Pressure Side 1. Disconnect 2P connector of pressure switch. 2. Measure the resistance with an ohmmeter across the connector terminals. 3. If 0 ohm is not indicated at normal condition, there is no refrigerant in the refrigerating cycle because gas leaks or pressure switch is defective.
Page 508: Front Wiper Motor
CABIN M108S, WSM Wiper Switch 1. Check the continuity through the switch with an ohmmeter. 2. If the continuity specified below are not indicated, the switch is faulty. Terminal Position WASH I WASH II (1) Front Wiper Switch Connector W1046557...
Page 509: Disassembling And Assembling
CABIN M108S, WSM [2] DISASSEMBLING AND ASSEMBLING (1) Separating Cabin from Tractor Draining Coolant CAUTION • Never remove the radiator cap until coolant temperature is well below its boiling point. Then loosen cap slightly to the stop to relieve any excess pressure before removing cap completely.
Page 510 CABIN M108S, WSM Preparation 2 1. Remove the battery (1). 2. Remove the ECU cover (2). 3. Remove the ECU mounting screws and ECU (3). NOTE • Take care not to damage to ECU. (1) Battery (3) ECU (2) ECU Cover...
Page 511 CABIN M108S, WSM Preparation 3 Without discharging the refrigerant from system 1. Remove the air condenser slide stopper (1) and slide out the air condenser (2). 2. Loosen the lock nut (6) and adjusting screw (5) then remove the air compressor belt (8).
Page 512 CABIN M108S, WSM Preparation 4 1. Remove the brake oil tank (1). 2. Remove the power steering delivery hose (2). 3. Remove the joint shaft (3). (When reassembling) 22 to 27 N·m Power steering turning Tightening torque 2.2 to 2.8 kgf·m hose retaining nut 16 to 20 lbf·ft...
Page 513 CABIN M108S, WSM Preparation 6 1. Remove the seat (1) and floor seat cover (2). 2. Remove the floor mat (3) and inspection plate under the floor mat. 3. Disconnect the main shift rod 2 (5). 4. Disconnect the select wire (4).
Page 514 CABIN M108S, WSM Preparation 7 1. Disconnect the PTO clutch cable (3). 2. Disconnect the parking brake wire (2). 3. Disconnect the brake hose LH, RH (4). 4. Remove the auxiliary control valve wire (1). 5. Disconnect the ground cable (5).
Page 515 CABIN M108S, WSM Dismounting Cabin 1. Set the cabin dismounting tool (2). 2. Remove the cabin mounting bolts and nuts (1). 3. Dismounting the cabin from tractor body. (When reassembling) 124 to 147 N·m Cabin mounting screws Tightening torque 12.6 to 15.0 kgf·m and nuts 91.2 to 108 lbf·ft...
Page 516: Removing Compressor Assembly
CABIN M108S, WSM (2) Removing Compressor Assembly Compressor Assembly 1. Discharge the refrigerant from the system. (Refer to “(1) Discharging the Refrigerant” in this section.) 2. Disconnect the low pressure pipe (suction) (1) and high pressure pipe 1 (discharge) (2) from the compressor, then cap the open fitting immediately to keep moisture out of the system.
Page 517 CABIN M108S, WSM Hub Plate 1. Three stopper bolts (1) are set in stopper magnet clutch (2) at the position corresponding to the shape of compressor. (Refer to “8. SPECIAL TOOLS” at “G. GENERAL” section.) 2. The stopper magnet clutch (2) is hung on hub plate (3) and it is fixed that the compressor rotates.
Page 518: Removing Air Conditioner Unit
CABIN M108S, WSM (3) Removing Air Conditioner Unit Air Conditioning Unit 1. Remove the unit cover (1). 2. Disconnect the heater hoses (6). 3. Disconnect the cooler pipe (liquid) (2) and cooler pipe (suction side) (3). 4. Remove the five screws and take off the air conditioning unit.
Page 519 CABIN M108S, WSM High Pressure Pipe 1, 2 and Low Pressure Pipe 1. Disconnect the low pressure pipe (2) and high pressure pipe 1 (1) from the compressor (3), then cap the open fittings immediately to keep moisture out of the system.
Page 520: Removing Heater Hoses
CABIN M108S, WSM High Pressure and Low Pressure Pipes 1. Remove the outer roof. 2. Disconnect the pressure switch (1) connector. 3. Disconnect the high pressure pipe 2 (2), then cap the open fitting immediately to keep moisture out of the system.
Page 521 CABIN M108S, WSM Heater Hoses 1. Disconnect the heater hoses (1), (2), and take out them under the cabin. (When reassembling) • Note the inlet hose and outlet hose. (1) Heater Hose 1 (2) Heater Hose 2 W1030123 Inner Covers 1.
Page 522: Cab Windshield
CABIN M108S, WSM (6) Cab Windshield Preparation 1. Prepare the followings. - Cutter knife 1 piece - Scraper 1 piece - Gun for coating 1 piece - Sika Tack-Ultrafast or equivalent - Sika-cleaner No. 1 - Gummed tape NOTE • Sika Tack-Ultrafast and cleaner No. 1 are made by Sika Corporation.
Page 523: Wiper Motor
CABIN M108S, WSM Before Replacing Windshields (3) 1. Check that the glasses are not damaged and cracked. 2. Turn over the glass and clean this surface of the glass by Sika- cleaner No. 1. 3. The cleaning area of the rear surface is indicated “A” in the figure left.
Page 524: Servicing
CABIN M108S, WSM Rear Wiper Motor (Option) 1. Remove the wiper motor cover (5). 2. Disconnect the rear wiper motor 4P connector (2). 3. Remove the wiper arm mounting nut (4) and wiper arm (6). 4. Remove the wiper link cap (3) and nut.
Page 525 EDITOR : KUBOTA FARM & INDUSTRIAL MACHINERY SERVICE, LTD. 64, ISHIZU-KITAMACHI, SAKAI-KU, SAKAI-CITY, OSAKA, 590-0823, JAPAN PHONE : ( 81 ) 72-241-1129 : ( 81 ) 72-245-2484 E-mail : ksos-pub@kubota.co.jp Printed in Japan 2012. 05, S, EI, EI, engusa Code No.9Y111-00722 KUBOTA Corporation 2007.

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