wsm STW37 Workshop Manual

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WORKSHOP MANUAL

TRACTOR

STW34,STW37,STW40

KiSC issued 11, 2014 A

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Troubleshooting

Summary of Contents for wsm STW37

Page 1 WORKSHOP MANUAL TRACTOR STW34,STW37,STW40 KiSC issued 11, 2014 A...
Page 2 TO THE READER This Workshop Manual tells the servicing personnel about the mechanism, servicing and maintenance of the STW34, STW37 and STW40. It contains 4 parts: "Information", "General", "Mechanism" and "Servicing".  Information This section primarily contains information below. • Safety First •...
Page 3 Record of Revisions For pdf, use search function {Search word} to find all the revised locations. Last digit Issue Reference of the Main Revised Point and Corrective Measures {Search word} month Page Code No. 2014.11 Correction of specifications. I-8, G-8, G-19, 1-S21, 1-S31,...
Page 4 INFORMATION KiSC issued 11, 2014 A...
Page 5: Table Of Contents
INFORMATION CONTENTS 1. SAFETY FIRST ..........................I-1 2. SAFETY DECALS .......................... I-4 3. SPECIFICATIONS.......................... I-8 4. TRAVELLING SPEEDS........................ I-10 5. DIMENSIONS ..........................I-11 KiSC issued 11, 2014 A...
Page 6: Safety First
INFORMATION STW34, STW37, STW40, WSM 1. SAFETY FIRST SAFETY FIRST • This symbol, the industry's "Safety Alert Symbol", is used throughout this manual and on labels on the machine itself to warn of the possibility of personal injury. Read these instructions carefully.
Page 7 INFORMATION STW34, STW37, STW40, WSM OPERATE SAFELY • Do not use the machine after you consume alcohol or medication or when you are tired. • Put on applicable clothing and safety equipment. • Use applicable tools only. Do not use alternative tools or parts.
Page 8 INFORMATION STW34, STW37, STW40, WSM KEEP A GOOD AIRFLOW IN THE WORK AREA • If the engine is in operation, make sure that the area has good airflow. Do not operate the engine in a closed area. The exhaust gas contains poisonous carbon monoxide.
Page 9: Safety Decals
INFORMATION STW34, STW37, STW40, WSM 2. SAFETY DECALS The following safety decals (pictorial safety labels) are installed on the machine. If a decal becomes damaged, illegible or is not on the machine, replace it. The decal part number is listed in the parts list.
Page 10 INFORMATION STW34, STW37, STW40, WSM 9Y1211109INI0002US0 KiSC issued 11, 2014 A...
Page 11 INFORMATION STW34, STW37, STW40, WSM 9Y1211109INI0003US0 KiSC issued 11, 2014 A...
Page 12 INFORMATION STW34, STW37, STW40, WSM 9Y1211109INI0004US0 CARE OF PICTORIAL SAFETY LABELS 1. Keep pictorial safety labels clean and free from obstructing material. 2. Clean pictorial safety labels with soap and water, dry with a soft cloth. 3. Replace damaged or missing pictorial safety labels with new labels.
Page 13: Specifications
INFORMATION STW34, STW37, STW40, WSM 3. SPECIFICATIONS Model STW34 STW37 STW40 Engine power ECE-R24 23.6 kW (32.1 PS) 25.9 kW (35.2 PS) 27.3 kW (37.1 PS) [97/68/EC] [24.5 kW (33.3 PS)] [26.9 kW (36.6 PS)] [28.3 kW (38.5 PS)] Engine power SAE gross*1 24.9 kW (33.9 PS)
Page 14 INFORMATION STW34, STW37, STW40, WSM Model STW34 STW37 STW40 ROPS 83.8 dB (A) 85.8 dB (A) CAB/door 84.4 dB (A) 84.4 dB (A) Noise at the operator's ear *3 closed CAB/door 84.5 dB (A) 84.5 dB (A) opened ROPS 78 dB (A)
Page 15: Travelling Speeds
INFORMATION STW34, STW37, STW40, WSM 4. TRAVELLING SPEEDS (At rated engine speed) Model STW34, STW37, STW40 Tire Size (Rear) 9.5-22 13.6-16 Range gear shift lever km/h (mile/h) km/h (mile/h) 0 to 7.9 0 to 7.8 1 (Low) (0 to 4.9) (0 to 4.8)
Page 16: Dimensions
INFORMATION STW34, STW37, STW40, WSM 5. DIMENSIONS ROPS 9Y1211109INI0008US0 I-11 KiSC issued 11, 2014 A...
Page 17 INFORMATION STW34, STW37, STW40, WSM CABIN 9Y1211109INI0009US0 I-12 KiSC issued 11, 2014 A...
Page 18 GENERAL KiSC issued 11, 2014 A...
Page 19 GENERAL CONTENTS 1. TRACTOR IDENTIFICATION....................... G-1 2. GENERAL PRECAUTION ......................G-2 3. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING ........G-3 [1] WIRING ..........................G-3 [2] BATTERY ..........................G-5 [3] FUSE ............................G-5 [4] CONNECTOR ........................G-5 [5] HANDLING OF CIRCUIT TESTER ..................G-6 [6] COLOR OF WIRING ......................
Page 20: Tractor Identification
GENERAL STW34, STW37, STW40, WSM 1. TRACTOR IDENTIFICATION When you contact local KUBOTA distributor, always specify engine serial number, the tractor serial number and hour meter reading. (1) Tractor Identification Plate (3) Engine Serial Number (2) Tractor Serial Number 9Y1211109GEG0001US0...
Page 21: General Precaution
GENERAL STW34, STW37, STW40, WSM 2. GENERAL PRECAUTION • When you disassemble, carefully put the parts in a clean area to make it easy to find the parts. You must install the screws, bolts and nuts in their initial position to prevent the reassembly errors.
Page 22: Handling Precautions For Electrical Parts And Wiring
GENERAL STW34, STW37, STW40, WSM 3. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING To ensure safety and prevent damage to the machine and surrounding equipment, obey the following precautions in handling electrical parts and wiring. IMPORTANT • Check electrical wiring for damage and loosened connection every year.
Page 23 GENERAL STW34, STW37, STW40, WSM • Securely insert grommet. (1) Grommet (A) Correct (B) Incorrect WSM000001GEG0066US0 • Securely clamp, being careful not to damage wiring. (1) Clamp (3) Clamp (Wind Clamp Spirally) (4) Welding Dent (2) Wire Harness WSM000001GEG0067US0 • Clamp wiring so that there is no twist, unnecessary sag, or excessive tension, except for movable part, where sag be required.
Page 24: Battery
GENERAL STW34, STW37, STW40, WSM [2] BATTERY • Be careful not to confuse positive and negative terminal posts. • When you remove battery cables, disconnect negative cable first. When you install battery cables, check for polarity and connect positive cable first.
Page 25: Handling Of Circuit Tester
GENERAL STW34, STW37, STW40, WSM • Use sandpaper to remove rust from terminals. • Repair deformed terminal. Make sure that there is no terminal being exposed or displaced. (1) Exposed Terminal (3) Sandpaper (2) Deformed Terminal (4) Rust WSM000001GEG0075US0 • Make sure that there is no female connector being too open.
Page 26: Color Of Wiring
GENERAL STW34, STW37, STW40, WSM [6] COLOR OF WIRING • Colors of wire are specified to the color codes. • This symbol of "/" shows color with stripe(s). (An example) Red stripe on white color: W/R Color of wiring Color code...
Page 27: Lubricants, Fuel And Coolant
GENERAL STW34, STW37, STW40, WSM 4. LUBRICANTS, FUEL AND COOLANT Capacity Place Lubricants, fuel and coolant STW34 STW37 STW40 29.5 L • No. 2-D diesel fuel Fuel 7.79 U.S.gals • No. 1-D diesel fuel if temperature 6.49 Imp.gals is below –10 °C (14 °F) 6.6 L...
Page 28 GENERAL STW34, STW37, STW40, WSM NOTE Engine Oil • Oil used in the engine should have an American Petroleum Institute (API) service classification and Proper SAE Engine Oil according to the ambient temperatures as shown above: • With the emission control now in effect, the CF-4 and CG-4 lubricating oils have been developed for use of a low sulfur fuel on on-road vehicle engines.
Page 29: Tightening Torques
GENERAL STW34, STW37, STW40, WSM 5. TIGHTENING TORQUES [1] GENERAL USE SCREWS, BOLTS AND NUTS Tighten screws, bolts and nuts whose tightening torques are not specified in this Workshop Manual according to the table below. Indication on top of bolt...
Page 30: Hydraulic Fittings
GENERAL STW34, STW37, STW40, WSM [3] HYDRAULIC FITTINGS (1) Hydraulic Hose Fittings Tightening torque Hose size Thread side N·m kgf·m lbf·ft 13.8 to 15.6 1.40 to 1.60 10.2 to 11.5 22.6 to 27.4 2.30 to 2.80 16.7 to 20.2 45.2 to 52.9 4.60 to 5.40...
Page 31: Metric Screws, Bolts And Nuts
GENERAL STW34, STW37, STW40, WSM [4] METRIC SCREWS, BOLTS AND NUTS Grade Property class 8.8 Property class 10.9 Unit N·m kgf·m lbf·ft N·m kgf·m lbf·ft 24 to 27 2.4 to 2.8 18 to 20 30 to 34 3.0 to 3.5...
Page 32: Maintenance Check List
GENERAL STW34, STW37, STW40, WSM 6. MAINTENANCE CHECK LIST Service Interval Refer- After Item ence porta since 50 100 150 200 250 300 350 400 450 500 550 600 650 700 page every 1 Greasing – G-20   ...
Page 33 GENERAL STW34, STW37, STW40, WSM Service Interval Refer- After Item ence porta since 50 100 150 200 250 300 350 400 450 500 550 600 650 700 page every 23 Front axle pivot Adjust G-33  600 Hr every 24 Engine valve clearance...
Page 34: Check And Maintenance
GENERAL STW34, STW37, STW40, 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. 9Y1211109GEG0005US0 [1] DAILY CHECK To prevent trouble from occurring, it is important to know the condition of the tractor well. Check it before starting.
Page 35: Check Points Of Initial 50 Hours
GENERAL STW34, STW37, STW40, WSM Cleaning Air Conditioner Condenser Screen [CAB Model] WARNING To avoid personal injury or death: • Be sure to stop the engine before removing the screen. • The condenser and receiver become hot while the air conditioner is running.
Page 36 GENERAL STW34, STW37, STW40, WSM Replacing Engine Oil Filter Cartridge WARNING To avoid personal injury or death: • Be sure to stop the engine before changing the oil filter cartridge. • Allow engine to cool down sufficiently, oil can be hot and can burn.
Page 37 GENERAL STW34, STW37, STW40, WSM Replacing Transmission Oil Filter WARNING To avoid personal injury or death: • Be sure to stop the engine before changing the oil filter cartridge. • Allow engine to cool down sufficiently, oil can be hot and can burn.
Page 38 GENERAL STW34, STW37, STW40, WSM Changing Transmission Fluid / Replacing Hydraulic Oil Filter  Cleaning Magnetic Filter WARNING To avoid personal injury or death: • Be sure to stop the engine before changing the oil filter cartridge. • Allow engine to cool down sufficiently, oil can be hot and can burn.
Page 39: Check Points Of Every 50 Hours
GENERAL STW34, STW37, STW40, WSM [3] CHECK POINTS OF EVERY 50 HOURS Greasing 1. Apply a grease to the following position as figures. (1) Grease Fitting (Top Link) (4) Grease Fitting (Brake Pedal Shaft) (2) Grease Fitting (Lifting Rod RH)
Page 40 GENERAL STW34, STW37, STW40, WSM Checking Engine Start System WARNING To avoid personal injury or death: • Do not allow anyone near the tractor while testing. • If the tractor does not pass the test do not operate the tractor.
Page 41 GENERAL STW34, STW37, STW40, WSM Checking Operator Presence Control WARNING To avoid personal injury or death: • Do not allow anyone near the tractor while testing. • If the tractor does not pass the test, do not operate the tractor.
Page 42 GENERAL STW34, STW37, STW40, WSM Checking Wheel Bolt Torque WARNING To avoid personal injury or death: • Never operate tractor with a loose rim, wheel, or axle. • Any time bolts and nuts are loosened, retighten to specified torque. • Check all bolts and nuts frequently and keep them tight.
Page 43: Check Points Of Every 100 Hours
GENERAL STW34, STW37, STW40, WSM [4] CHECK POINTS OF EVERY 100 HOURS Checking Clutch Pedal Free Travel • See page G-17. 9Y1211109GEG0015US0 Cleaning Air Cleaner Element [Single Element] 1. Remove the element. 2. Clean the element: (1) When dry dust adheres to the element, blow compressed air from the inside, turning the element.
Page 44 GENERAL STW34, STW37, STW40, WSM (Continued) IMPORTANT • The air cleaner uses a dry element, never apply oil. • Do not run the engine with filter element removed. • Be sure to refit the cover with the arrow mark (on the rear of cover) upright.
Page 45 GENERAL STW34, STW37, STW40, WSM Checking Fuel Line CAUTION • Stop the engine when attempting the check and change prescribed below. • Remember to check the fuel line periodically. The fuel line is subject to wear and aging, fuel may leak out onto the running engine, causing a fire.
Page 46 GENERAL STW34, STW37, STW40, WSM Adjusting Brake Pedal Free Travel WARNING To avoid personal injury or death: • Stop the engine and chock the wheels before checking brake pedal. 1. Release the parking brake. 2. Slightly depress the brake pedals and measure free travel at top of pedal stroke.
Page 47 GENERAL STW34, STW37, STW40, WSM Checking Battery Condition DANGER To avoid the possibility of battery explosion: For the refillable type battery, follow the instructions below. • Do not use or charge the refillable type battery if the fluid level is below the LOWER (lower limit level) mark.
Page 48 GENERAL STW34, STW37, STW40, WSM Battery Charging WARNING To avoid personal injury or death: • When the battery is being activated, hydrogen and oxygen gases in the battery are extremely explosive. Keep open sparks and flames away from the battery at all times, especially when charging the battery.
Page 49: Check Points Of Every 200 Hours
GENERAL STW34, STW37, STW40, WSM [5] CHECK POINTS OF EVERY 200 HOURS Changing Engine Oil • See page G-16. 9Y1211109GEG0024US0 Changing Engine Oil Filter • See page G-17. 9Y1211109GEG0077US0 Changing Transmission Oil Filter • See page G-18. 9Y1211109GEG0078US0 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 50 GENERAL STW34, STW37, STW40, WSM Adjusting Toe-in 1. Park the tractor on the flat place. 2. Inflate the tires to the specified pressure. 3. Turn steering wheel so front wheels are in the straight ahead position. 4. Lower the implement, lock the parking brake and stop the engine.
Page 51 GENERAL STW34, STW37, STW40, WSM Cleaning Inner Air Filter [CAB Model] Remove the inner filter, and blow air from the direction opposite to the filter's normal air flow. Pressure of compressed air must be under 205 kPa (2.1 kgf/cm , 30 psi).
Page 52: Check Points Of Every 400 Hours
GENERAL STW34, STW37, STW40, WSM [6] CHECK POINTS OF EVERY 400 HOURS Replacing Hydraulic Oil Filter Cartridge • See page G-19. 9Y1211109GEG0028US0 Replacing Fuel Filter Element • See page G-25. 9Y1211109GEG0029US0 Changing Transmission Fluid / Replacing hydraulic Oil Filter • See page G-18.
Page 53: Check Points Of Every 2 Years
GENERAL STW34, STW37, STW40, WSM Checking CAB Isolation Cushion [CAB Model] 1. Check the cushion for any breakage or fatigue. Replace them if they are deteriorated. 9Y1211109GEG0076US0 [10] CHECK POINTS OF EVERY 2 YEARS Replacing Radiator Hose (Water Pipes) 1. Replace the hoses and clamps.
Page 54 GENERAL STW34, STW37, STW40, WSM Flush Cooling System and Changing Coolant WARNING To avoid personal injury or death: • Do not remove radiator cap while coolant is hot. When cool, slowly rotate cap to the first stop and allow sufficient time for excess pressure to escape before removing the cap completely.
Page 55 GENERAL STW34, STW37, STW40, WSM (Continued)  Anti-Freeze WARNING To avoid personal injury or death: • When using antifreeze, put on some protection such as rubber gloves (Antifreeze contains poison.). • If it is swallowed, seek immediate medical help. Do NOT make a person throw up unless told to do so by poison control or a health care professional.
Page 56: Others
GENERAL STW34, STW37, STW40, WSM (Continued) Freezing Point Boiling Point* Vol % Anti-freeze °C °F °C °F −37 −34 * At 1.013 × 10 Pa (760 mmHg) pressure (atmospheric). A higher boiling point is obtained by using a radiator pressure cap which permits the development of pressure within the cooling system.
Page 57 GENERAL STW34, STW37, STW40, WSM 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 58 GENERAL STW34, STW37, STW40, WSM Replacing Slow-Blow Fuses The slow-blow fuses are intended to protect the electrical cabling. If any of them has blown out, be sure to pinpoint the cause. Never use any substitute, use only a KUBOTA genuine part.
Page 59 GENERAL STW34, STW37, STW40, WSM Adding Washer Liquid [CAB Model] Add a proper amount of automobile washer liquid. 1.2 L Washer tank Capacity 1.3 U.S.qts 1.1 Imp.qts (1) Washer Liquid Tank 9Y1211109GEG0047US0 Checking the Amount of Refrigerant (Gas) [CAB Model]...
Page 60: Special Tools
GENERAL STW34, STW37, STW40, WSM 8. SPECIAL TOOLS [1] SPECIAL TOOLS FOR ENGINE Special Use Puller Set Code No. • 07916-09032 Application • Use exclusively to pull out bearing, gears and other parts with ease. WSM000001GEG0011US0 Piston Ring Compressor Code No.
Page 61 GENERAL STW34, STW37, STW40, WSM Oil Pressure Tester Code No. • 07916-32032 Application • Use to measure lubricating oil pressure. (1) Gauge (5) Adaptor 2 (2) Cable (6) Adaptor 3 (3) Threaded Joint (7) Adaptor 4 (4) Adaptor 1 (8) Adaptor 5...
Page 62 GENERAL STW34, STW37, STW40, WSM Auxiliary Socket For Fixing Crankshaft Sleeve Code No. • 07916-32091 Application • Use to fix the crankshaft sleeve of the diesel engine. WSM000001GEG0095US0 Plastigauge Code No. • 07909-30241 Application • Use to check the oil clearance between crankshaft and bearing, etc..
Page 63 GENERAL STW34, STW37, STW40, WSM NOTE • The following special tools are not provided, so make them referring to the figure. 9Y1211109GEG0050US0 Valve Guide Replacing Tool Application • Use to press out and press fit the valve guide. 20 mm dia. (0.79 in. dia.) 11.7 to 11.9 mm dia.
Page 64 GENERAL STW34, STW37, STW40, WSM Injection Pump Pressure Tester Application • Use to check fuel tightness of injection pumps. Pressure gauge full scale: More than 29.4 MPa (300 kgf/cm , 4267 psi) Copper gasket Flange (Material: Steel) Hex. nut 27 mm (1.06 in.) across the plat...
Page 65 GENERAL STW34, STW37, STW40, WSM Flywheel Stopper Application • Use to loosen and tighten the flywheel screw. 200 mm (7.87 in.) 30 mm (1.18 in.) 20 mm (0.79 in.) 15 mm (0.59 in.) 5 mm (0.20 in.) 8 mm (0.31 in.) 10 mm dia.
Page 66: Special Tools For Tractor
GENERAL STW34, STW37, STW40, WSM [2] SPECIAL TOOLS FOR TRACTOR Tie-rod End Lifter Code No. • 07909-39051 Application • Use to remove the tie-rod end with ease. WSM000001GEG0029US0 Steering Wheel Puller Code No. • 07916-51090 Application • Use to remove the steering wheel without damage to the steering shaft.
Page 67 GENERAL STW34, STW37, STW40, WSM Clutch Pack Disassembly Tool Code No. • 07916-53741 Application • This allows easy installation of bi-speed clutch pack spring. 9Y1211109GEG0057US0 Adaptor 7 Code No. • 07916-32951 Application • Use for checking regulating valve setting pressure.
Page 68 GENERAL STW34, STW37, STW40, WSM NOTE • The following special tools are not provided, so make them referring to the figure. 9Y1211109GEG0059US0 Adaptor for Flow Meter Application • Use for checking the hydraulic pump for 3P linkage. NOTE • When using, attach with following parts.
Page 69: Tires
GENERAL STW34, STW37, STW40, WSM 9. TIRES [1] TIRE PRESSURE WARNING To avoid personal injury or death: • Do not attempt to mount a tire on a rim. This should be done by a qualified person with the proper equipment.
Page 70: Tread
GENERAL STW34, STW37, STW40, WSM [2] TREAD WARNING To avoid personal injury or death: • A When working on slopes or when working with trailer, set the wheel tread as wide as practical for maximum stability. • Support tractor securely on stands before removing a wheel.
Page 71: Front Wheels
GENERAL STW34, STW37, STW40, WSM (1) Front Wheels Front wheel tread can not be adjusted. IMPORTANT • Do not turn front discs to obtain wider tread. • When re-fitting or adjusting a wheel, tighten the bolts to the following torques then recheck after driving the tractor 200 m (219 yards) and 10 times of shuttle movement by 5 m (5 yards), and thereafter according to service interval.
Page 72: Tire Liquid Injection
GENERAL STW34, STW37, STW40, WSM [3] TIRE LIQUID INJECTION Auxiliary weights can be used to increase traction force for plowing in fields or clayey ground. Another way is to inject water or another liquid, such as a calcium chloride solution in the tires. Water must not be used in winter since it freezes at 0 °C (32 °F).
Page 73 GENERAL STW34, STW37, STW40, 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 74 ENGINE KiSC issued 11, 2014 A...
Page 75 MECHANISM CONTENTS 1. LUBRICATING SYSTEM......................1-M1 2. COOLING SYSTEM ........................1-M2 3. FUEL SYSTEM........................... 1-M3 KiSC issued 11, 2014 A...
Page 76 ENGINE STW34, STW37, STW40, WSM 1. LUBRICATING SYSTEM (1) Rocker Arm (2) Oil Pressure Switch (3) Rocker Arm Shaft (4) Valve (5) Governor Shaft (6) Idle Gear (7) Crankshaft (8) Oil Pump (9) Oil Strainer (10) Relief Valve (11) Oil Filter Cartridge...
Page 77 ENGINE STW34, STW37, STW40, WSM 2. COOLING SYSTEM Bottom bypass system is introduced in 03-M 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 78 ENGINE STW34, STW37, STW40, WSM 3. FUEL SYSTEM (1) Fuel Overflow Pipe (4) Fuel Tank (7) Fuel Filter Injected Fuel Flow (2) Injection Nozzle (5) Injection Pump Air Vent Pipe (8) Fuel Feed Pump Returned Fuel Flow (3) Injection Pipe...
Page 79 SERVICING CONTENTS 1. TROUBLESHOOTING.........................1-S1 2. SERVICING SPECIFICATIONS ....................1-S5 3. TIGHTENING TORQUES......................1-S10 4. CHECKING, DISASSEMBLING AND SERVICING ..............1-S12 [1] CHECKING AND ADJUSTING....................1-S12 (1) Engine Body ........................1-S12 (2) Lubricating System ......................1-S15 (3) Cooling System ......................1-S15 (4) Fuel System........................1-S18 [2] PREPARATION ........................1-S20 (1) Separating Engine from Tractor for ROPS ..............1-S20 (2) Separating Engine from Tractor for CABIN ..............1-S30 [3] DISASSEMBLING AND ASSEMBLING ................1-S47 (1) Cylinder Head and Valves .....................1-S47...
Page 80: Troubleshooting
ENGINE STW34, STW37, STW40, WSM 1. TROUBLESHOOTING Probable Cause and Reference Symptom Solution Checking Procedure Page 1. Battery is discharged. Recharge battery. G-29 Stator Motor Does not Operate 2. Battery is damaged. Replace battery. – 3. Slow blow fuse is blown.
Page 81 ENGINE STW34, STW37, STW40, WSM Probable Cause and Reference Symptom Solution Checking Procedure Page 1. Fuel tank is empty. Fill fuel to fuel tank. Engine Does Not Start 2. Fuel filter is clogged. Replace fuel filter. G-25 3. Air is in the fuel system.
Page 82 ENGINE STW34, STW37, STW40, WSM Probable Cause and Reference Symptom Solution Checking Procedure Page 1. Fuel filter is clogged or Replace fuel filter. G-25 Engine Revolution Is dirty. Not Smooth 2. Air cleaner element is Clean or replace air cleaner element.
Page 83 ENGINE STW34, STW37, STW40, WSM Probable Cause and Reference Symptom Solution Checking Procedure Page 1. Piston ring's gap faces the Shift ring gap direction. 1-S57 Lubricant Oil same direction. Consumption Is Excessive 2. Oil ring is worn or stuck. Replace oil ring.
Page 84: Servicing Specifications
ENGINE STW34, STW37, STW40, WSM 2. SERVICING SPECIFICATIONS ENGINE BODY Item Factory Specification Allowable Limit Valve Clearance (When Cold) 0.18 to 0.22 mm – 0.0071 to 0.0086 in. Compression Pressure 3.6 to 4.0 MPa / 2.5 MPa / (When Cranking with Starting Motor)
Page 85 ENGINE STW34, STW37, STW40, WSM Item Factory Specification Allowable Limit Valve Spring Free Length 41.7 to 42.2 mm 41.2 mm 1.65 to 1.66 in. 1.62 in. Setting Load / 118 N / 35.0 mm 100 N / 35.0 mm Setting Length 12.0 kgf / 35.0 mm...
Page 86 ENGINE STW34, STW37, STW40, WSM Item Factory Specification Allowable Limit Camshaft Journal to Cylinder Block Bore Oil Clearance 0.050 to 0.091 mm 0.15 mm 0.0020 to 0.0035 in. 0.0059 in. • Camshaft Journal O.D. 39.934 to 39.950 mm – 1.5722 to 1.5728 in.
Page 87 ENGINE STW34, STW37, STW40, WSM Item Factory Specification Allowable Limit Crankpin to Crankpin Bearing Oil Clearance 0.025 to 0.087 mm 0.20 mm 0.00099 to 0.0034 in. 0.0079 in. • Crankpin O.D. 46.959 to 46.975 mm – 1.8488 to 1.8494 in.
Page 88 ENGINE STW34, STW37, STW40, WSM COOLING SYSTEM Item Factory Specification Allowable Limit Fan Belt Tension 10 to 12 mm / – (0.40 to 0.047 in.) deflection at 98 N (10 kgf, 22 lbs) of force Thermostat Valve Opening 69.5 to 72.5 °C –...
Page 89: Tightening Torques
ENGINE STW34, STW37, STW40, 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 See "5. TIGHTENING TORQUES" on page G-10.) Item N·m kgf·m...
Page 90 ENGINE STW34, STW37, STW40, WSM Dimension × Item N·m kgf·m lbf·ft Pitch Cylinder head cover screw M6 × 1.0 6.87 to 11.2 0.700 to 1.15 5.07 to 8.31 *Cylinder head screw M11 × 1.25 93.2 to 98.0 9.50 to 10.0 68.8 to 72.3...
Page 91: Checking, Disassembling And Servicing
ENGINE STW34, STW37, STW40, WSM 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING (1) Engine Body Compression Pressure 1. Operate the engine until it is warmed up. 2. Stop the engine and disconnect the 2P connector from the stop solenoid in order to inject fuel.
Page 92 ENGINE STW34, STW37, STW40, WSM Top Clearance 1. Remove the cylinder head. 2. Move the piston and stick a strip of fuse on the piston head at three positions with grease. 3. Lower the piston and install the cylinder head. (Use a new cylinder head gasket and tighten with a specified tightening torque.)
Page 93 ENGINE STW34, STW37, STW40, WSM Valve Clearance IMPORTANT • The valve clearance must be checked and adjusted when engine is cold. 1. Remove the head cover. 2. Remove the cap of the timing window (4) on the housing under the right step.
Page 94: Lubricating System
ENGINE STW34, STW37, STW40, WSM (2) Lubricating System Engine Oil Pressure 1. Remove the engine oil pressure switch, and set an oil pressure tester (Code No. 07916-32032). (Adaptor screw size: PT 1/8) 2. Start the engine. After warming up, measure the oil pressure of both idling and rated speeds.
Page 95 ENGINE STW34, STW37, STW40, 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.
Page 96 ENGINE STW34, STW37, STW40, WSM Thermostat Valve Opening Temperature 1. Suspend the thermostat in the water by a string with its end inserted between the valve and seat. 2. Heat the water gradually and read the temperature when the valve opens and leaves the string.
Page 97: Fuel System
ENGINE STW34, STW37, STW40, WSM (4) Fuel System Injection Timing 1. Remove the stop solenoid. 2. Remove the injection pipes and nozzle. 3. Remove the cap of the timing window (2) on the housing under the right step. 4. Set the speed control lever to maximum fuel discharge position.
Page 98 ENGINE STW34, STW37, STW40, WSM CAUTION • Check the injection pressure and condition after making sure that there is nobody standing in the direction the fume goes. • If the fume from the nozzle directly contacts the human body, cells may be destroyed and blood poisoning may be caused.
Page 99: Preparation
ENGINE STW34, STW37, STW40, WSM [2] PREPARATION (1) Separating Engine from Tractor for ROPS Draining Engine Oil 1. Place an oil pan underneath the engine. 2. To open the hood (1), hold the hood (1) and pull the release lever (3) and open the hood (1).
Page 100 ENGINE STW34, STW37, STW40, WSM Draining Transmission Fluid 1. Place an oil pan underneath the transmission case, and remove the drain plugs (1). 2. Drain the transmission fluid. 3. Reinstall the drain plugs (1). (When reassembling) • Fill new oil from filling port after removing the filling plug (2) up to the upper notch on the dipstick (3).
Page 101 ENGINE STW34, STW37, STW40, WSM Steering Wheel and Panel Under Cover 1. Remove the covers (3). 2. Remove the steering wheel cap. 3. Remove the steering wheel mounting nut (1) and remove the steering wheel (2) with a steering wheel puller (Code No.
Page 102 ENGINE STW34, STW37, STW40, WSM Rubber and Wiring Harness 1. Remove the fuel tank cover (1) 2. Disconnect the OPC controller connector (4). 3. Remove the steering controller cover (3). 4. Remove the sponge (2). 5. Turn over the fuel sensor cover (5), and disconnect the grounding wire (8) and 1P connector (6) from the fuel level sensor (7).
Page 103 ENGINE STW34, STW37, STW40, WSM Power Steering Hoses and Accelerator Wire (Right Side) 1. Disconnect the accelerator wire (1) from the engine. 2. Disconnect the fuel hose (2). 3. Disconnect the delivery hose L.H. (3) and delivery hose R.H. (4) from the steering controller.
Page 104 ENGINE STW34, STW37, STW40, WSM Wiring Harness (Left Side) 1. Remove the fuse box (1) from the stay. 2. Disconnect the connectors from the relays (2). 3. Remove the glow relay (3). 4. Remove the key stop relay (4). 5. Remove the slow blow fuse boxes (6).
Page 105 ENGINE STW34, STW37, STW40, WSM Wiring Harness (Right Side) 1. Disconnect the connector from the flasher unit (1). 2. Remove the air cleaner (2). 3. Disconnect the glow plug cable (3). 4. Disconnect the 1P connector (4) from the coolant temperature sensor.
Page 106 ENGINE STW34, STW37, STW40, WSM Fuel Tank 1. Pull out the clamps (1), (4). 2. Disconnect the overflow hoses from fuel tank (3). 3. Remove the screws (5), (6) and then remove the fuel tank (3) with pillar (2). (1) Clamp...
Page 107 ENGINE STW34, STW37, STW40, WSM Propeller Shaft 1. Loosen the clamp screws (1) and slide the propeller shaft cover (2). 2. Tap out the spring pin (3) and then slide the coupling (4). 3. Remove the propeller shaft with the cover.
Page 108 ENGINE STW34, STW37, STW40, WSM Clutch Assembly 1. Remove the clutch mounting screws and remove the clutch assembly (1) from the flywheel (4). (When reassembling) • Direct the shorter end of the clutch disc boss toward the flywheel (4). • Apply molybdenum disulphide (Three Bond 1901 or equivalent) to the splines of clutch disc boss.
Page 109: Separating Engine From Tractor For Cabin
ENGINE STW34, STW37, STW40, WSM (2) Separating Engine from Tractor for CABIN Draining Engine Oil 1. Place an oil pan underneath the engine. 2. To open the hood (1), hold the hood (1) and pull the release lever (3) and open the hood (1).
Page 110 ENGINE STW34, STW37, STW40, WSM Draining Transmission Fluid 1. Place an oil pan underneath the transmission case, and remove the drain plugs (1). 2. Drain the transmission fluid. 3. Reinstall the drain plugs (1). (When reassembling) • Fill new oil from filling port after removing the filling plug (2) up to the upper notch on the dipstick (3).
Page 111 ENGINE STW34, STW37, STW40, WSM Hood, Side Cover and Battery Cord 1. To open the hood (1), hold the hood (1) and pull the release lever (3) and open the hood (1). 2. Remove the bolt from each of the side covers (2) and remove the side covers (2).
Page 112 ENGINE STW34, STW37, STW40, WSM Instrument Panel and Panel Under Cover 1. Remove the screw (2). 2. Open the panel cover (1) and disconnect the electrical outlet connector (5). 3. Open the instrument panel (4) and disconnect the instrument panel connector (6). Then remove the instrument panel (4).
Page 113 ENGINE STW34, STW37, STW40, WSM Wiring Harness 1. Disconnect the combination switch connector (5), main switch connector (1), hazard switch connector (4) and wiper motor connector (2). 2. Remove the panel under cover (3). 3. Remove the rubbers (6), (7).
Page 114 ENGINE STW34, STW37, STW40, WSM Power Steering Hoses and Steering Support 1. Disconnect the accelerator wire (5) from the engine. 2. Disconnect the OPC controller connector (1) and CABIN joint connectors (4). 3. Remove the step cover (3). 4. Disconnect the delivery hose L.H. (6) and delivery hose R.H. (7) from the steering controller.
Page 115 ENGINE STW34, STW37, STW40, WSM Seat and Lever Grip 1. Disconnect the seat switch connector (7) and remove the seat (4). 2. Remove the grips of the rear PTO shift lever (2), position control lever (1), cruise control lever (5) and range gear shift lever (6).
Page 116 ENGINE STW34, STW37, STW40, WSM Auxiliary Control Valve and Covers 1. Remove the valve cover (1). 2. Remove the valve stay (4). 3. Remove the connecting rods (3). (When reassembling) • Reassemble the connecting rods (3) as shown in the figure.
Page 117 ENGINE STW34, STW37, STW40, WSM Fender Assembly 1. Remove the fender cover (1). 2. Remove the sponges (4), (5). (When reassembling) • Assemble the sponge (center) (4) between the cruise control lever (2) and range gear shift lever (6). (1) Fender Cover...
Page 118 ENGINE STW34, STW37, STW40, WSM Wiring Harness (Right Side) 1. Remove the loader lever guide mounting screws (1). 2. Open the loader lever guide (2) and then disconnect the connectors for PTO switch (4) and beacon switch (3). (1) Loader Lever Guide Mounting...
Page 119 ENGINE STW34, STW37, STW40, WSM Wiring Harness (Rear Side) 1. Open the tool box (1). 2. Remove the clamps (2), (3) from the Cabin. 3. Disconnect the registration lamp connectors (4). 4. Disconnect the washer motor connectors (5). 5. Disconnect the PTO switch connector (6).
Page 120 ENGINE STW34, STW37, STW40, WSM Clutch Pedal, Brake Pedal and Cabin Stopper Bolt 1. Remove the both sides of hose plate (5). 2. Remove the clutch pedal (3). 3. Remove the brake pedal L.H. (6) and R.H. (7) 4. Loosen the both sides of lock nut (2), and then remove the both...
Page 121 ENGINE STW34, STW37, STW40, WSM Air Compressor and Oil Hoses 1. Disconnect the heater hoses (1), and then reconnect their hoses to make loop. NOTE • Put a mark to the each heater hose before disconnecting. 2. Remove the air conditioner belt (4).
Page 122 ENGINE STW34, STW37, STW40, WSM Wiring Harness (Right Side) 1. Disconnect the connectors for QGS controller (1) and flasher unit (2). 2. Disconnect the coolant temperature sensor connector (7) and glow plug cable (6). 3. Disconnect the connector for key stop solenoid (4), engine revolution sensor (5) and front wheel angle sensor (8).
Page 123 ENGINE STW34, STW37, STW40, WSM Fuel Tank and Muffler 1. Remove the muffler (1). 2. Pull out the clamps (4). 3. Remove the screws (5), (6) and then remove the fuel tank (3) with pillar (2). 4. Remove the retaining screw (7).
Page 124 ENGINE STW34, STW37, STW40, WSM Propeller Shaft 1. Loosen the clamp screws (1) and slide the propeller shaft cover (2). 2. Tap out the spring pin (3) and then slide the coupling (4). 3. Remove the propeller shaft with the cover.
Page 125 ENGINE STW34, STW37, STW40, WSM Clutch Assembly 1. Remove the clutch mounting screws and remove the clutch assembly (1) from the flywheel (4). (When reassembling) • Direct the shorter end of the clutch disc boss toward the flywheel (4). • Apply molybdenum disulphide (Three Bond 1901 or equivalent) to the splines of clutch disc boss.
Page 126: Disassembling And Assembling
ENGINE STW34, STW37, STW40, WSM [3] DISASSEMBLING AND ASSEMBLING (1) Cylinder Head and Valves Cylinder Head Cover 1. Remove the lead (4). 2. Remove the breather hose (1). 3. Remove the head cover screws (3). 4. Remove the cylinder head cover (2).
Page 127 ENGINE STW34, STW37, STW40, WSM Nozzle Holder Assembly and Glow Plug 1. Remove the overflow pipe assembly (3). 2. Remove the nozzle holder assemblies (4) using a 21 mm deep socket wrench. 3. Remove the copper gasket and heat seal (5).
Page 128 ENGINE STW34, STW37, STW40, WSM Cylinder Head 1. Loosen the pipe clamp (1), and remove the water return pipe (2). 2. Remove the cylinder head screw in the order of "n" to "a". 3. Lift up the cylinder head (3) to remove.
Page 129 ENGINE STW34, STW37, STW40, WSM Valves 1. Remove the valve caps (3). 2. Remove the valve spring collet (4), pushing the valve spring retainer (5) by valve spring replacer (1). 3. Remove the valve spring retainer (5), valve spring (6) and valve stem seal (2).
Page 130: Timing Gears, Camshaft And Fuel Camshaft
ENGINE STW34, STW37, STW40, WSM (2) Timing Gears, Camshaft and Fuel Camshaft Injection Pump 1. Remove the stop solenoid (4) and hi-idling body (1). 2. 2. Remove the engine stop lever (3) and stop solenoid guide (6). 3. 3. Remove the fuel injection pump assembly (2).
Page 131 ENGINE STW34, STW37, STW40, WSM Governor Springs and Speed Control Plate NOTE • Specific tool (1): 1.2 mm diameter hard wire with its end hooked, overall length 200 mm (7.87 in.). The tip of wire is bent like the hook to hang governor springs.
Page 132 ENGINE STW34, STW37, STW40, WSM (Continued) (When reassembling) • Set the end with less clearance (color painted (8) when it is new) of small governor spring (4) to the governor lever (7). • Set the large governor spring (3) to the governor lever (7).
Page 133 ENGINE STW34, STW37, STW40, WSM Fan Drive Pulley 1. Lock the flywheel not to turn using the flywheel stopper. 2. Remove the fan drive pulley mounting nut (1) using 46 mm deep socket wrench (3). 3. Remove the fan drive pulley (2) with gear puller (4).
Page 134 ENGINE STW34, STW37, STW40, WSM Idle Gear 1. Remove the external snap ring. 2. Remove the idle gear collar. 3. Remove the idle gear (2). (When reassembling) • Check to see each gear is aligned with its aligning mark. –...
Page 135: Piston And Connecting Rod
ENGINE STW34, STW37, STW40, WSM Crank Gear 1. Draw out the crank gear (2) with a puller (1). 2. Remove the feather key. (1) Crank Puller (2) Crank Gear 9Y1211109ENS0081US0 (3) Piston and Connecting Rod Oil Pan and Oil Strainer 1.
Page 136 ENGINE STW34, STW37, STW40, WSM Pistons 1. Completely clean carbon (1) in the cylinders. 2. Remove the connecting rod cap (3). 3. Turn the flywheel and bring the piston to top dead center. 4. Draw out the piston upward by lightly tapping it from the bottom of the crankcase with the grip of a hammer.
Page 137 ENGINE STW34, STW37, STW40, WSM Piston Ring and Connecting Rod 1. Remove the piston rings (4), (5), (6) using a piston ring tool (Code No. 07909-32121). 2. Remove the piston pin (1), and separate the connecting rod (7) from the piston (2).
Page 138: Crankshaft
ENGINE STW34, STW37, STW40, WSM (4) Crankshaft Flywheel 1. Fit the stopper to the flywheel (1). 2. At first, remove two pieces of the flywheel screws (2). 3. Insert two pieces of the flywheel guide screws (3) in the holes.
Page 139 ENGINE STW34, STW37, STW40, WSM Crankshaft NOTE • Before disassembling, check the side clearance of crankshaft. Also check it during reassembling. For D1703-M 1. Remove the main bearing case screw 2 (1). 2. Pull out the crankshaft assembly, taking care not to damage the crankshaft bearing 1 (3).
Page 140 ENGINE STW34, STW37, STW40, WSM Main Bearing Case Assembly 1. Remove the two main bearing case screws 1 (7), and remove the main bearing case assembly being careful with thrust bearing and crankshaft bearing. 2. Remove the main bearing case 1, 2 as above.
Page 141: Thermostat And Water Pump
ENGINE STW34, STW37, STW40, WSM (5) Thermostat and Water Pump CAUTION • When removing the radiator cap, wait at least ten minutes after the engine has stopped and cooled down. Otherwise, hot water way gush out, scalding nearby people. 9Y1211109ENS0089US0 Thermostat Assembly 1.
Page 142: Servicing
ENGINE STW34, STW37, STW40, WSM [4] SERVICING (1) Cylinder Head and Valves Top Clearance 1. Remove the cylinder head. 2. With the piston at TDC, use grease to affix three or four plastigauges (1) of a diameter 1.5 mm (0.059 in.) × 5.0 to 7.0 mm (0.20 to 0.27 in.) long to the crown of the piston;...
Page 143 ENGINE STW34, STW37, STW40, WSM Valve Recessing 1. Clean the cylinder head surface, valve face and valve seat. 2. Insert the valve into the valve guide. 3. Measure the valve recessing with a depth gauge. 4. If the measurement exceeds the allowable limit, replace the valve.
Page 144 ENGINE STW34, STW37, STW40, WSM Replacing Valve Guide (When removing) 1. Press out the used valve guide using a valve guide replacing tool. (When installing) 1. Clean a new valve guide and valve guide bore, and apply engine oil to them.
Page 145 ENGINE STW34, STW37, STW40, 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 146 ENGINE STW34, STW37, STW40, WSM Free Length and Tilt of Valve Spring 1. Measure the free length (B) of valve spring with vernier calipers. If the measurement is less than the allowable limit, replace it. 2. Put the valve spring on a surface plate, place a square on the side of the valve spring.
Page 147: Timing Gears, Camshaft And Fuel Camshaft
ENGINE STW34, STW37, STW40, 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 148 ENGINE STW34, STW37, STW40, WSM Idle Gear Side Clearance 1. Set a dial indicator with its tip on the idle gear. 2. Measure the side clearance by moving the idle gear to the front and rear. 3. If the measurement exceeds the allowable limit, replace the idle gear collar.
Page 149 ENGINE STW34, STW37, STW40, WSM Camshaft Alignment 1. Support the camshaft with V blocks on the surface plate at both end journals. 2. Set a dial indicator with its tip on the intermediate journal. 3. Measure the camshaft alignment. 4. If the measurement exceeds the allowable limit, replace the camshaft.
Page 150: Piston And Connecting Rod
ENGINE STW34, STW37, STW40, WSM (3) Piston and Connecting Rod Piston Pin Bore I.D. 1. Measure the piston pin bore I.D. in both the horizontal and vertical directions with a cylinder gauge. 2. If the measurement exceeds the allowable limit, replace the piston.
Page 151 ENGINE STW34, STW37, STW40, WSM Connecting Rod Alignment NOTE • Since the I.D. of the connecting rod small end bushing is the basis of this check, check bushing for wear beforehand. 1. Install the piston pin into the connecting rod.
Page 152: Crankshaft
ENGINE STW34, STW37, STW40, WSM (4) Crankshaft Side Clearance of Crankshaft 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 153 ENGINE STW34, STW37, STW40, WSM Oil Clearance between Crankpin and Crankpin Bearing 1. Clean the crankpin and crankpin bearing. 2. Put a strip of plastigauge on the center of the crankpin. 3. Install the connecting rod cap and tighten the connecting rod screws to the specified torque, and remove the cap again.
Page 154 ENGINE STW34, STW37, STW40, WSM Oil Clearance between Crankshaft Journal and Crankshaft Bearing 1 1. Measure the O.D. of the crankshaft journal with an outside micrometer. 2. Measure the I.D. of the crankshaft bearing 1 with an inside micrometer, and calculate oil clearance.
Page 155 ENGINE STW34, STW37, STW40, WSM Oil Clearance between Crankshaft Journal and Crankshaft Bearing 2 1. Put a strip of plastigauge on the centre of the journal. 2. Install the bearing case and tighten the bearing case screws 1 to the specified torque, and remove the bearing case again.
Page 156: Cylinder
ENGINE STW34, STW37, STW40, WSM Replacing Crankshaft Sleeve 1. Remove the used crankshaft sleeve using a special-use puller set (Code No. 07916-32091). 2. Set the sleeve guide (2) to the crankshaft. 3. Set the stopper (1) to the crankshaft as shown in figure.
Page 157: Oil Pump
ENGINE STW34, STW37, STW40, WSM Correcting Cylinder (Oversize +0.25 mm) 1. When the cylinder is worn beyond the allowable limit, bore and hone it to the specified dimension. 87.250 to 87.272 mm Oversize cylinder I.D. Factory specification 3.4351 to 3.4359 in.
Page 158 CLUTCH KiSC issued 11, 2014 A...
Page 159 MECHANISM CONTENTS 1. LINKAGE MECHANISM ......................2-M1 KiSC issued 11, 2014 A...
Page 160 CLUTCH STW34, STW37, STW40, WSM 1. LINKAGE MECHANISM (1) Flywheel (4) Release Bearing (6) Release Fork (8) Clutch Rod (2) Clutch Disc (5) Release Hub (7) Clutch Lever (9) Clutch Pedal (3) Pressure Plate Assembly The dry single type clutch is adopted for this tractor.
Page 161 SERVICING CONTENTS 1. TROUBLESHOOTING.........................2-S1 2. SERVICING SPECIFICATIONS ....................2-S2 3. TIGHTENING TORQUES......................2-S3 4. CHECKING, DISASSEMBLING AND SERVICING ..............2-S4 [1] CHECKING AND ADJUSTING....................2-S4 [2] PREPARATION ........................2-S5 (1) Separating Engine from Clutch Housing for ROPS ............2-S5 (2) Separating Engine from Tractor for CABIN ..............2-S14 [3] DISASSEMBLING AND ASSEMBLING ................2-S30 [4] SERVICING .........................2-S31 KiSC issued 11, 2014 A...
Page 162: Troubleshooting
CLUTCH STW34, STW37, STW40, WSM 1. TROUBLESHOOTING Probable Cause and Reference Symptom Solution Checking Procedure Page 1. Clutch pedal free travel is Adjust the clutch pedal free travel to the 2-S4 Clutch Drags too much. factory specification. 2. Dusts generated from the...
Page 163: Servicing Specifications
CLUTCH STW34, STW37, STW40, WSM 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Clutch Pedal Free Travel on 20 to 30 mm – Clutch Pedal 0.78 to 1.18 in. Clutch Disc Disc Surface to – 0.3 mm Rivet Top 0.012 in.
Page 164: Tightening Torques
CLUTCH STW34, STW37, STW40, 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" on page G-10.) Item N·m kgf·m lbf·ft...
Page 165: Checking, Disassembling And Servicing
CLUTCH STW34, STW37, STW40, WSM 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING Checking Clutch Pedal Free Travel CAUTION • When checking, park the tractor on flat ground, apply the parking brake, stop the engine and remove the key.
Page 166: Preparation
CLUTCH STW34, STW37, STW40, WSM [2] PREPARATION (1) Separating Engine from Clutch Housing for ROPS Draining Engine Oil 1. Place an oil pan underneath the engine. 2. To open the hood (1), hold the hood (1) and pull the release lever (3) and open the hood (1).
Page 167 CLUTCH STW34, STW37, STW40, WSM Draining Transmission Fluid 1. Place an oil pan underneath the transmission case, and remove the drain plugs (1). 2. Drain the transmission fluid. 3. Reinstall the drain plugs (1). (When reassembling) • Fill new oil from filling port after removing the filling plug (2) up to the upper notch on the dipstick (3).
Page 168 CLUTCH STW34, STW37, STW40, WSM Steering Wheel and Panel Under Cover 1. Remove the covers (3). 2. Remove the steering wheel cap. 3. Remove the steering wheel mounting nut (1) and remove the steering wheel (2) with a steering wheel puller (Code No.
Page 169 CLUTCH STW34, STW37, STW40, WSM Rubber and Wiring Harness 1. Remove the fuel tank cover (1) 2. Disconnect the OPC controller connector (4). 3. Remove the steering controller cover (3). 4. Remove the sponge (2). 5. Turn over the fuel sensor cover (5), and disconnect the grounding wire (8) and 1P connector (6) from the fuel level sensor (7).
Page 170 CLUTCH STW34, STW37, STW40, WSM Power Steering Hoses and Accelerator Wire (Right Side) 1. Disconnect the accelerator wire (1) from the engine. 2. Disconnect the fuel hose (2). 3. Disconnect the delivery hose L.H. (3) and delivery hose R.H. (4) from the steering controller.
Page 171 CLUTCH STW34, STW37, STW40, WSM Wiring Harness (Left Side) 1. Remove the fuse box (1) from the stay. 2. Disconnect the connectors from the relays (2). 3. Remove the glow relay (3). 4. Remove the key stop relay (4). 5. Remove the slow blow fuse boxes (6).
Page 172 CLUTCH STW34, STW37, STW40, WSM Wiring Harness (Right Side) 1. Disconnect the connector from the flasher unit (1). 2. Remove the air cleaner (2). 3. Disconnect the glow plug cable (3). 4. Disconnect the 1P connector (4) from the coolant temperature sensor.
Page 173 CLUTCH STW34, STW37, STW40, WSM Fuel Tank 1. Pull out the clamps (1), (4). 2. Disconnect the overflow hoses from fuel tank (3). 3. Remove the screws (5), (6) and then remove the fuel tank (3) with pillar (2). (1) Clamp...
Page 174 CLUTCH STW34, STW37, STW40, WSM Propeller Shaft 1. Loosen the clamp screws (1) and slide the propeller shaft cover (2). 2. Tap out the spring pin (3) and then slide the coupling (4). 3. Remove the propeller shaft with the cover.
Page 175: Separating Engine From Tractor For Cabin
CLUTCH STW34, STW37, STW40, WSM (2) Separating Engine from Tractor for CABIN Draining Engine Oil 1. Place an oil pan underneath the engine. 2. To open the hood (1), hold the hood (1) and pull the release lever (3) and open the hood (1).
Page 176 CLUTCH STW34, STW37, STW40, WSM Draining Transmission Fluid 1. Place an oil pan underneath the transmission case, and remove the drain plugs (1). 2. Drain the transmission fluid. 3. Reinstall the drain plugs (1). (When reassembling) • Fill new oil from filling port after removing the filling plug (2) up to the upper notch on the dipstick (3).
Page 177 CLUTCH STW34, STW37, STW40, WSM Hood, Side Cover and Battery Cord 1. To open the hood (1), hold the hood (1) and pull the release lever (3) and open the hood (1). 2. Remove the bolt from each of the side covers (2) and remove the side covers (2).
Page 178 CLUTCH STW34, STW37, STW40, WSM Instrument Panel and Panel Under Cover 1. Remove the screw (2). 2. Open the panel cover (1) and disconnect the electrical outlet connector (5). 3. Open the instrument panel (4) and disconnect the instrument panel connector (6). Then remove the instrument panel (4).
Page 179 CLUTCH STW34, STW37, STW40, WSM Wiring Harness 1. Disconnect the combination switch connector (5), main switch connector (1), hazard switch connector (4) and wiper motor connector (2). 2. Remove the panel under cover (3). 3. Remove the rubbers (6), (7).
Page 180 CLUTCH STW34, STW37, STW40, WSM Power Steering Hoses and Steering Support 1. Disconnect the accelerator wire (5) from the engine. 2. Disconnect the OPC controller connector (1) and CABIN joint connectors (4). 3. Remove the step cover (3). 4. Disconnect the delivery hose L.H. (6) and delivery hose R.H. (7) from the steering controller.
Page 181 CLUTCH STW34, STW37, STW40, WSM Seat and Lever Grip 1. Disconnect the seat switch connector (7) and remove the seat (4). 2. Remove the grips of the rear PTO shift lever (2), position control lever (1), cruise control lever (5) and range gear shift lever (6).
Page 182 CLUTCH STW34, STW37, STW40, WSM Auxiliary Control Valve and Covers 1. Remove the valve cover (1). 2. Remove the valve stay (4). 3. Remove the connecting rods (3). (When reassembling) • Reassemble the connecting rods (3) as shown in the figure.
Page 183 CLUTCH STW34, STW37, STW40, WSM Fender Assembly 1. Remove the fender cover (1). 2. Remove the sponges (4), (5). (When reassembling) • Assemble the sponge (center) (4) between the cruise control lever (2) and range gear shift lever (6). (1) Fender Cover...
Page 184 CLUTCH STW34, STW37, STW40, WSM Wiring Harness (Right Side) 1. Remove the loader lever guide mounting screws (1). 2. Open the loader lever guide (2) and then disconnect the connectors for PTO switch (4) and beacon switch (3). (1) Loader Lever Guide Mounting...
Page 185 CLUTCH STW34, STW37, STW40, WSM Wiring Harness (Rear Side) 1. Open the tool box (1). 2. Remove the clamps (2), (3) from the Cabin. 3. Disconnect the registration lamp connectors (4). 4. Disconnect the washer motor connectors (5). 5. Disconnect the PTO switch connector (6).
Page 186 CLUTCH STW34, STW37, STW40, WSM Clutch Pedal, Brake Pedal and Cabin Stopper Bolt 1. Remove the both sides of hose plate (5). 2. Remove the clutch pedal (3). 3. Remove the brake pedal L.H. (6) and R.H. (7) 4. Loosen the both sides of lock nut (2), and then remove the both...
Page 187 CLUTCH STW34, STW37, STW40, WSM Air Compressor and Oil Hoses 1. Disconnect the heater hoses (1), and then reconnect their hoses to make loop. NOTE • Put a mark to the each heater hose before disconnecting. 2. Remove the air conditioner belt (4).
Page 188 CLUTCH STW34, STW37, STW40, WSM Wiring Harness (Right Side) 1. Disconnect the connectors for QGS controller (1) and flasher unit (2). 2. Disconnect the coolant temperature sensor connector (7) and glow plug cable (6). 3. Disconnect the connector for key stop solenoid (4), engine revolution sensor (5) and front wheel angle sensor (8).
Page 189 CLUTCH STW34, STW37, STW40, WSM Fuel Tank and Muffler 1. Remove the muffler (1). 2. Pull out the clamps (4). 3. Remove the screws (5), (6) and then remove the fuel tank (3) with pillar (2). 4. Remove the retaining screw (7).
Page 190 CLUTCH STW34, STW37, STW40, WSM Propeller Shaft 1. Loosen the clamp screws (1) and slide the propeller shaft cover (2). 2. Tap out the spring pin (3) and then slide the coupling (4). 3. Remove the propeller shaft with the cover.
Page 191: Disassembling And Assembling
CLUTCH STW34, STW37, STW40, WSM [3] DISASSEMBLING AND ASSEMBLING Clutch Assembly 1. Remove the clutch mounting screws and remove the clutch assembly (1) from the flywheel (4). (When reassembling) • Direct the shorter end of the clutch disc boss toward the flywheel (4).
Page 192: Servicing
CLUTCH STW34, STW37, STW40, WSM [4] SERVICING Backlash between Clutch Disc and Clutch Shaft 1. Mount the clutch disc onto the propeller shaft. 2. Hold the propeller shaft so that it does not rotate. 3. Slightly move the disc and measure the displacement around disc edge.
Page 193 CLUTCH STW34, STW37, STW40, WSM Checking Clutch Release Bearing 1. Check the clutch release bearing. If surface is worn excessively, or abnormal sounds occur, replace it. 9Y1211109CLS0011US0 2-S32 KiSC issued 11, 2014 A...
Page 194 TRANSMISSION KiSC issued 11, 2014 A...
Page 195 MECHANISM CONTENTS 1. STRUCTURE..........................3-M1 2. POWER TRAIN FOR TRAVELING SYSTEM................3-M2 [1] HYDROSTATIC TRANSMISSION (HST) ................3-M2 (1) Structure ......................... 3-M2 (2) Hydraulic Circuit ......................3-M3 (3) Pump and Motor ......................3-M4 (4) Operation and Valves ..................... 3-M5 (5) Control Linkage ......................3-M9 (6) Cruise Control Linkage ....................
Page 196 TRANSMISSION STW34, STW37, STW40, WSM 1. STRUCTURE (1) HST (Hydrostatic Transmission) Section (3) Range Gear Shift Section (4) Rear PTO Gear Shift Section (5) Mid PTO Gear Shift Section (6) Front Wheel Drive Section (7) Bi-speed Turn Clutch Section (2) PTO Clutch Section...
Page 197: Structure
TRANSMISSION STW34, STW37, STW40, WSM 2. POWER TRAIN FOR TRAVELING SYSTEM [1] HYDROSTATIC TRANSMISSION (HST) (1) Structure Hydrostatic transmission consists variable displacement piston pump, fixed displacement piston motor, charge pump and valve system. (1) Input Shaft (11) Hose Joint (for PTO Clutch)
Page 198: Hydraulic Circuit
TRANSMISSION STW34, STW37, STW40, WSM (2) Hydraulic Circuit (1) Oil Tank (Transmission Case) (2) Case Relief Valve (3) Variable Displacement Pump (HST Pump) (4) Check and High Pressure Relief Valve (Forward) (5) Check and High Pressure Relief Valve (Reverse) (6) Charge Relief Valve...
Page 199: Pump And Motor
TRANSMISSION STW34, STW37, STW40, WSM (3) Pump and Motor (1) Piston (2) Cylinder (3) Oil (A) Pump (B) Motor (a) Swashplate Pump and motor cylinder, each containing pistons, are connected by lines. Cylinders and lines are filled with oil. Pistons ride against swashplates located in pump and motor.
Page 200: Operation And Valves
TRANSMISSION STW34, STW37, STW40, WSM (4) Operation and Valves Neutral Position (1) Oil Cooler (2) Power Steering Cylinder (3) HST Pump (Variable Discharge Pump) (4) HST Oil Filter (10 µ) (5) Charge Relief Valve (6) Output Shaft (7) Oil Tank...
Page 201 TRANSMISSION STW34, STW37, STW40, WSM Forward Position (1) Oil Cooler (2) Cylinder Block (Pump) (3) HST Oil Filter (10 µ) (4) Check and High Pressure Relief Valve (Forward) (5) Neutral Valve (Forward) (6) Output Shaft (7) Cylinder Block (Motor) (8) Piston (Motor)
Page 202 TRANSMISSION STW34, STW37, STW40, WSM Reverse Position (1) Oil Cooler (2) Cylinder Block (Pump) (3) HST Oil Filter (10 µ) (4) Check and High Pressure Relief Valve (Reverse) (5) Neutral Valve (Reverse) (6) Output Shaft (7) Cylinder Block (Motor) (8) Piston (Motor)
Page 203 TRANSMISSION STW34, STW37, STW40, WSM Charge Relief Valve The charge oil flow the steering controller flows into the main oil circuit through the check valves, excessive oil passes to the case through the charge relief valve. (1) Spring From the Steering...
Page 204: Control Linkage
TRANSMISSION STW34, STW37, STW40, WSM (5) Control Linkage (1) Speed Control Pedal (4) HST Lever R.H. (7) HST Link Rod (9) Roller (2) HST Pedal Rod (5) Trunnion Wheel (8) Neutral Cam (10) Neutral Holder (3) Damper (6) HST Lever L.H.
Page 205: Cruise Control Linkage
TRANSMISSION STW34, STW37, STW40, WSM (6) Cruise Control Linkage (1) Release Lever (3) Cruise Control Lever (5) HST Link Rod (7) Cruise Link (2) Spring Assembly (6) Cruise Rod (8) Lever Guide (4) HST Lever L.H. When the cruise control lever (3) is shifted forward, the claw portion of the release lever (1) engages with the lever guide (8) by the spring (2) and the position of the cruise control lever (3) is kept.
Page 206: Cruise Control Release System
TRANSMISSION STW34, STW37, STW40, WSM (7) Cruise Control Release System (1) Brake Link 1 (5) Lever Guide (8) Cruise Control Lever (10) HST Pedal Support (2) Brake Pedal R.H. (6) Release Lever Assembly (11) Release Wire (3) Brake Link 2...
Page 207: Range Gear Shift Section
TRANSMISSION STW34, STW37, STW40, WSM [2] RANGE GEAR SHIFT SECTION (1) Hypoid Pinion Shaft (2) Spline Boss (3) 22T Shifter Gear (4) Rear Counter Shaft 1st Speed 2nd Speed 3rd Speed 9Y1211109TRM0015US0 [3] FRONT WHEEL DRIVE SECTION (1) Hypoid Pinion Shaft...
Page 208: Bi-Speed Turn System
TRANSMISSION STW34, STW37, STW40, WSM [4] BI-SPEED TURN SYSTEM (1) Feature It is used hydraulic and electrical control type bi-speed turn system. The front wheel rotates by 1.5 times the speed compared with normal 4WD when the following conditions become complete.
Page 209: Hydraulic Oil Flow
TRANSMISSION STW34, STW37, STW40, WSM Hydraulic Clutch (Bi-speed) When the pressurized oil enter to the hydraulic clutch, the piston (3) moves to the right in the figure and presses clutch disc and plate (4). Then the power is transmitted to the 32T gear (5).
Page 210: Power Train Of Hydraulic Clutch Section
TRANSMISSION STW34, STW37, STW40, WSM (4) Power Train of Hydraulic Clutch Section 4WD Position (1) 27T Gear (2) Shifter (3) Piston (4) Spring (5) Counter Shaft When the hydraulic clutch is not operated, the piston (3) is pushed by the spring (4) and shifter (2) is engaged to the 27T gear (1) with spline.
Page 211: Power Train For Pto System
TRANSMISSION STW34, STW37, STW40, WSM 3. POWER TRAIN FOR PTO SYSTEM [1] INDEPENDENT PTO SYSTEM (1) Hydraulic Oil Flow (1) Transmission Case (2) Oil Filter (3) Hydraulic Pump (for Power Steering) (4) Regulator Valve (5) Pressure Reducing Valve (6) Regulating Valve...
Page 212: Power Train Of Pto Clutch Section
TRANSMISSION STW34, STW37, STW40, WSM (2) Power Train of PTO Clutch Section (1) Input Shaft (2) Clutch Disc and Plate (PTO Side) (3) Clutch Body (4) PTO Drive Shaft (5) Spring (6) Piston (7) Clutch Disc and Plate (Brake Side) (8) Brake Hub ...
Page 213: Rear Pto Gear Shift Section
TRANSMISSION STW34, STW37, STW40, WSM [2] REAR PTO GEAR SHIFT SECTION (1) PTO Drive Shaft 800 min (rpm) (2) PTO Shaft (Engine 2717 min (rpm)) (3) Shifter 540 min (rpm) (Engine 2670 min (rpm)) 9Y1211109TRM0029US0 [3] MID PTO GEAR SHIFT SECTION ...
Page 214 SERVICING CONTENTS 1. TROUBLESHOOTING.........................3-S1 2. SERVICING SPECIFICATIONS ....................3-S5 3. TIGHTENING TORQUES......................3-S9 4. CHECKING, DISASSEMBLING AND SERVICING ..............3-S11 [1] CHECKING AND ADJUSTING....................3-S11 [2] PREPARATION ........................3-S16 (1) Separating Engine and Clutch Housing for ROPS ............3-S16 (2) Separating Engine and Clutch Housing Case ...............3-S29 (3) Separating Clutch Housing Case ..................3-S45 (4) Separating HST (Hydrostatic Transmission) ..............3-S47 (5) Separating Mid Case .....................3-S48...
Page 215: Troubleshooting
TRANSMISSION STW34, STW37, STW40, WSM 1. TROUBLESHOOTING 9Y1211109TRS0001US0 3-S1 KiSC issued 11, 2014 A...
Page 216 TRANSMISSION STW34, STW37, STW40, WSM 9Y1211109TRS0002US0 3-S2 KiSC issued 11, 2014 A...
Page 217 TRANSMISSION STW34, STW37, STW40, WSM Probable Cause and Reference Symptom Solution Checking Procedure Page 1. Transmission fluid is Fill transmission fluid. 3-S16, Excessive insufficient. 3-S30 Transmission Noise 2. Gear is worn or backlash is Replace gear and adjust backlash to the –...
Page 218 TRANSMISSION STW34, STW37, STW40, WSM Probable Cause and Reference Symptom Solution Checking Procedure Page 1. Backlash between spiral Adjust backlash between spiral bevel 3-S73 Excessive or Unusual bevel pinion and spiral pinion and spiral bevel gear to the factory Noise at All Time bevel gear is improper.
Page 219: Servicing Specifications
TRANSMISSION STW34, STW37, STW40, WSM 2. SERVICING SPECIFICATIONS HYDROSTATIC TRANSMISSION (HST) AND LINKAGE Item Factory Specification Allowable Limit Speed Control Pedal to Frame (Forward) Clearance 5 to 10 mm – 0.20 to 0.39 in. Maximum Traveling Speed (Reverse) – 70 to 80 % of –...
Page 220 TRANSMISSION STW34, STW37, STW40, WSM BI-SPEED HYDRAULIC CLUTCH AND GEARS Item Factory Specification Allowable Limit Clutch Disc Thickness 1.915 to 2.085 mm 1.4 mm 0.1754 to 0.0821 in. 0.055 in. Steel Plate Thickness 0.95 to 1.05 mm 0.8 mm 0.0374 to 0.0413 in.
Page 221 TRANSMISSION STW34, STW37, STW40, WSM HYDRAULIC PTO CLUTCH AND GEARS Item Factory Specification Allowable Limit Clutch Disc Thickness 1.70 to 1.90 mm 1.55 mm 0.067 to 0.075 in. 0.061 in. Steel Plate Thickness 0.95 to 1.05 mm 0.8 mm (Without Hole) 0.0374 to 0.0413 in.
Page 222 TRANSMISSION STW34, STW37, STW40, WSM Item Factory Specification Allowable Limit Differential case to Differential Side Gear Clearance 0.05 to 0.10 mm 0.4 mm 0.0020 to 0.0039 in. 0.016 in. • Differential Case Ring Gear I.D. 32.000 to 32.025 mm –...
Page 223: Tightening Torques
TRANSMISSION STW34, STW37, STW40, 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" on page G-10.) Item N·m kgf·m lbf·ft...
Page 224 TRANSMISSION STW34, STW37, STW40, WSM Item N·m kgf·m lbf·ft Clutch piston mounting nuts 12 to 14 1.2 to 1.5 8.7 to 10 Check and high-pressure relief valve plug 58.8 to 68.6 6.0 to 7.0 43.4 to 50.6 Port block mounting screw 39.3 to 44.1...
Page 225: Checking, Disassembling And Servicing
TRANSMISSION STW34, STW37, STW40, WSM 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING Adjusting Neutral 1. Disengage the front wheel drive lever. (Drive only rear wheels.) 2. Set the range gear shift lever at 3rd speed position. 3. Lift the rear of the tractor so that the rear wheels are off the ground and operate the engine at low idling and drive only rear wheels.
Page 226 TRANSMISSION STW34, STW37, STW40, WSM Adjusting Maximum Traveling Speed NOTE • Do this adjustment after the HST neutral adjustment. (Forward) 1. Fully press down the speed control pedal (forward) (1), and measure the clearance "A" between the pedal (1) and the frame (2).
Page 227 TRANSMISSION STW34, STW37, STW40, WSM Operation Check of Cruise Control Automatic Release 1. Engage the cruise control lever (1) and make sure the following operations. 2. The cruise control lever (1) should return to the home position, when right and left brake pedals are pressed at the same time.
Page 228 TRANSMISSION STW34, STW37, STW40, WSM 2) Release Wire (Cruise Control) 1. Remove the left rear wheel and the fender cover. 2. Engage the cruise control lever (1). 3. Check the inner wire in the release wire (5) does not slacken.
Page 229 TRANSMISSION STW34, STW37, STW40, WSM Checking High-pressure Relief Valve 1. Start the engine to warm up the transmission oil until to reach 50 °C (122 °F). 2. Remove the seat under cover and the step. 3. Install adaptor C (Code No.: 07916-50371) (3) and pressure gauge (49.0 MPa, 500 kgf/cm...
Page 230: Preparation
TRANSMISSION STW34, STW37, STW40, WSM [2] PREPARATION (1) Separating Engine and Clutch Housing for ROPS Draining Transmission Fluid 1. Place an oil pan underneath the transmission case, and remove the drain plugs (1). 2. Drain the transmission fluid. 3. Reinstall the drain plugs (1).
Page 231 TRANSMISSION STW34, STW37, STW40, WSM Steering Wheel and Panel Under Cover 1. Remove the covers (3). 2. Remove the steering wheel cap. 3. Remove the steering wheel mounting nut (1) and remove the steering wheel (2) with a steering wheel puller (Code No.
Page 232 TRANSMISSION STW34, STW37, STW40, WSM Rubber and Wiring Harness 1. Remove the fuel tank cover (1) 2. Disconnect the OPC controller connector (4). 3. Remove the steering controller cover (3). 4. Remove the sponge (2). 5. Turn over the fuel sensor cover (5), and disconnect the grounding wire (8) and 1P connector (6) from the fuel level sensor (7).
Page 233 TRANSMISSION STW34, STW37, STW40, WSM Power Steering Hoses and Accelerator Wire (Right Side) 1. Disconnect the accelerator wire (1) from the engine. 2. Disconnect the fuel hose (2). 3. Disconnect the delivery hose L.H. (3) and delivery hose R.H. (4) from the steering controller.
Page 234 TRANSMISSION STW34, STW37, STW40, WSM Fuel Tank 1. Pull out the clamps (1), (4). 2. Disconnect the overflow hoses from fuel tank (3). 3. Remove the screws (5), (6) and then remove the fuel tank (3) with pillar (2). (1) Clamp...
Page 235 TRANSMISSION STW34, STW37, STW40, WSM Seat, Seat Under Cover and Step 1. Disconnect the seat switch connector (9) and then remove the seat (3). 2. Remove the step mat (6). 3. Remove the grips of the mid PTO lever (4) and front wheel drive lever (5).
Page 236 TRANSMISSION STW34, STW37, STW40, WSM ROPS 1. Fold the ROPS and support it with the lift strap. 2. Remove the ROPS mounting bolts (1). 3. Pull out the ROPS. 167 to 197 N·m Tightening torque ROPS mounting bolt 17.0 to 20.0 kgf·m 123 to 144 lbf·ft...
Page 237 TRANSMISSION STW34, STW37, STW40, WSM Fender (Left Side) 1. Remove the fender covers (6) and the sponges (8), (9). 2. Remove the differential lock pedal (4) with the spring (5). 3. Remove the screws (3). 4. Remove the fender mounting screw (1).
Page 238 TRANSMISSION STW34, STW37, STW40, WSM Auxiliary Control Valve 1. Remove the valve cover (8). 2. Remove the valve stay (3). 3. Remove the connecting rods (2). (When reassembling) • Reassemble the connecting rods (2) as shown in the figure. • After reassembling the valve stay (3), adjust to locate the control lever (9) at a central position of the guide slot with the turnbuckle (10).
Page 239 TRANSMISSION STW34, STW37, STW40, WSM Fender (Right Side) 1. Remove the fender cover (2). 2. Remove the loader lever guide mounting nuts (5) and then open the loader lever guide (4). 3. Disconnect the connectors for PTO switch (3) and beacon switch (9).
Page 240 TRANSMISSION STW34, STW37, STW40, WSM Wiring Harness 1. Disconnect the brake light switch connector (1). 2. Remove the clamps (2). 3. Disconnect the connectors for parking brake switch (3) and Mid PTO switch (4). 4. Disconnect the grounding cable (5) 5.
Page 241 TRANSMISSION STW34, STW37, STW40, WSM Hydraulic Pipes and Bi-Speed Valve Connector 1. Disconnect the bi-speed valve connector (9). 2. Loosen the clamp and separate the hydraulic suction hose (1) from the hydraulic pump (2). 3. Remove the joints and disconnect the bi-speed delivery pipe (3) from the bi-speed valve and hydraulic pump (2).
Page 242 TRANSMISSION STW34, STW37, STW40, WSM Rear Frame and Under Frame 1. Remove the rubber mount screws (9) and rear frame mounting screws (5) then remove the rear frame (4). 2. Remove the rear cross bar (2). 3. Remove the rubber mount screw (8) and remove the rear bracket (6), (7).
Page 243: Separating Engine And Clutch Housing Case
TRANSMISSION STW34, STW37, STW40, WSM (2) Separating Engine and Clutch Housing Case Draining Engine Oil 1. Place an oil pan underneath the engine. 2. To open the hood (1), hold the hood (1) and pull the release lever (3) and open the hood (1).
Page 244 TRANSMISSION STW34, STW37, STW40, WSM Draining Transmission Fluid 1. Place an oil pan underneath the transmission case, and remove the drain plugs (1). 2. Drain the transmission fluid. 3. Reinstall the drain plugs (1). (When reassembling) • Fill new oil from filling port after removing the filling plug (2) up to the upper notch on the dipstick (3).
Page 245 TRANSMISSION STW34, STW37, STW40, WSM Hood, Side Cover and Battery Cord 1. To open the hood (1), hold the hood (1) and pull the release lever (3) and open the hood (1). 2. Remove the bolt from each of the side covers (2) and remove the side covers (2).
Page 246 TRANSMISSION STW34, STW37, STW40, WSM Instrument Panel and Panel Under Cover 1. Remove the screw (2). 2. Open the panel cover (1) and disconnect the electrical outlet connector (5). 3. Open the instrument panel (4) and disconnect the instrument panel connector (6). Then remove the instrument panel (4).
Page 247 TRANSMISSION STW34, STW37, STW40, WSM Wiring Harness 1. Disconnect the combination switch connector (5), main switch connector (1), hazard switch connector (4) and wiper motor connector (2). 2. Remove the panel under cover (3). 3. Remove the rubbers (6), (7).
Page 248 TRANSMISSION STW34, STW37, STW40, WSM Power Steering Hoses and Steering Support 1. Disconnect the accelerator wire (5) from the engine. 2. Disconnect the OPC controller connector (1) and CABIN joint connectors (4). 3. Remove the step cover (3). 4. Disconnect the delivery hose L.H. (6) and delivery hose R.H. (7) from the steering controller.
Page 249 TRANSMISSION STW34, STW37, STW40, WSM Seat and Lever Grip 1. Disconnect the seat switch connector (7) and remove the seat (4). 2. Remove the grips of the rear PTO shift lever (2), position control lever (1), cruise control lever (5) and range gear shift lever (6).
Page 250 TRANSMISSION STW34, STW37, STW40, WSM Auxiliary Control Valve and Covers 1. Remove the valve cover (1). 2. Remove the valve stay (4). 3. Remove the connecting rods (3). (When reassembling) • Reassemble the connecting rods (3) as shown in the figure.
Page 251 TRANSMISSION STW34, STW37, STW40, WSM Fender Assembly 1. Remove the fender cover (1). 2. Remove the sponges (4), (5). (When reassembling) • Assemble the sponge (center) (4) between the cruise control lever (2) and range gear shift lever (6). (1) Fender Cover...
Page 252 TRANSMISSION STW34, STW37, STW40, WSM Wiring Harness (Right Side) 1. Remove the loader lever guide mounting screws (1). 2. Open the loader lever guide (2) and then disconnect the connectors for PTO switch (4) and beacon switch (3). (1) Loader Lever Guide Mounting...
Page 253 TRANSMISSION STW34, STW37, STW40, WSM Wiring Harness (Rear Side) 1. Open the tool box (1). 2. Remove the clamps (2), (3) from the Cabin. 3. Disconnect the registration lamp connectors (4). 4. Disconnect the washer motor connectors (5). 5. Disconnect the PTO switch connector (6).
Page 254 TRANSMISSION STW34, STW37, STW40, WSM Clutch Pedal, Brake Pedal and Cabin Stopper Bolt 1. Remove the both sides of hose plate (5). 2. Remove the clutch pedal (3). 3. Remove the brake pedal L.H. (6) and R.H. (7) 4. Loosen the both sides of lock nut (2), and then remove the both...
Page 255 TRANSMISSION STW34, STW37, STW40, WSM Air Compressor and Oil Hoses 1. Disconnect the heater hoses (1), and then reconnect their hoses to make loop. NOTE • Put a mark to the each heater hose before disconnecting. 2. Remove the air conditioner belt (4).
Page 256 TRANSMISSION STW34, STW37, STW40, WSM Wiring Harness (Right Side) 1. Disconnect the connectors for QGS controller (1) and flasher unit (2). 2. Disconnect the coolant temperature sensor connector (7) and glow plug cable (6). 3. Disconnect the connector for key stop solenoid (4), engine revolution sensor (5) and front wheel angle sensor (8).
Page 257 TRANSMISSION STW34, STW37, STW40, WSM Fuel Tank and Muffler 1. Remove the muffler (1). 2. Pull out the clamps (4). 3. Remove the screws (5), (6) and then remove the fuel tank (3) with pillar (2). 4. Remove the retaining screw (7).
Page 258 TRANSMISSION STW34, STW37, STW40, WSM Propeller Shaft 1. Loosen the clamp screws (1) and slide the propeller shaft cover (2). 2. Tap out the spring pin (3) and then slide the coupling (4). 3. Remove the propeller shaft with the cover.
Page 259: Separating Clutch Housing Case
TRANSMISSION STW34, STW37, STW40, WSM (3) Separating Clutch Housing Case Clutch and Brake Linkage 1. Remove the brake rods (1), (7) and brake springs (6). 2. Remove the release wire (11). 3. Remove the brake link (10). 4. Remove the spring pin (8) and external snap ring (9), and remove the brake pedals (4), (5).
Page 260 TRANSMISSION STW34, STW37, STW40, WSM HST Linkage 1. Remove the return spring (1). 2. Remove the neutral holder (5) and holder shaft (6). 3. Remove the neutral cam (2) and HST link rod (4). 4. Remove the cruise control rod (3).
Page 261: Separating Hst (Hydrostatic Transmission)
TRANSMISSION STW34, STW37, STW40, WSM Separating Clutch Housing Case from Hydrostatic Transmission (HST) 1. Place a disassembly stand under the clutch housing (2) and HST (1). 2. Support the clutch housing (2) with the lift strap. 3. Remove the clutch housing mounting screws and nuts to separate the clutch housing (2) from the HST (1).
Page 262: Separating Mid Case
TRANSMISSION STW34, STW37, STW40, WSM (5) Separating Mid Case Separating Mid Case 1. Remove the transmission oil filter bracket (4) with suction pipe (3). 2. Remove the counter shaft and coupling (2). 3. Remove the mid case mounting screws and nuts to separate the mid case (1) from the transmission case.
Page 263: Separating Transmission Case
TRANSMISSION STW34, STW37, STW40, WSM (6) Separating Transmission Case 3 Points Linkage and Drawbar 1. Remove the lifting rods (1), (4). 2. Remove the top link (3) and PTO shaft cover (2). 3. Remove the lower links (5), (7) with the check chains.
Page 264 TRANSMISSION STW34, STW37, STW40, WSM Rear Axle 1. Remove the brake stay (2). 2. Remove the setting screw (4) and pull out the lower link pin (3). 3. Place the disassembling stand under the rear axle case. 4. Remove the rear axle mounting screws and nuts, and separate the rear axle (1).
Page 265: Disassembling And Assembling
TRANSMISSION STW34, STW37, STW40, WSM [3] DISASSEMBLING AND ASSEMBLING (1) Clutch Housing Case 18T Gear Shaft 1. Remove the bi-speed turn hydraulic clutch assembly (1) with 18T gear shaft (2) from the clutch housing case. (When reassembling) • Apply grease to the oil seal (3) of the clutch housing.
Page 266 TRANSMISSION STW34, STW37, STW40, WSM Disassembling Bi-speed Turn Hydraulic Clutch 1. Remove the internal snap ring (2), then remove the pressure plate (5), three clutch discs (11) and three steel plates (4). 2. Remove the external snap ring (1) with clutch pack disassembling tool (Code No.: 07916-53741), then remove the...
Page 267: Hydrostatic Transmission (Hst)
TRANSMISSION STW34, STW37, STW40, WSM (2) Hydrostatic Transmission (HST) (1) Case (5) Output Shaft (9) Case Relief Valve (13) Port Block (2) Trunnion Shaft (6) Fixed Displacement Piston (10) Valve Plate (Pump) (14) Check and High Pressure (3) Variable Displacement Piston...
Page 268 TRANSMISSION STW34, STW37, STW40, WSM Accumulator (for PTO Clutch) 1. Remove the internal snap ring and pull out the accumulator assembly (1). (When reassembling) • Apply transmission oil to the O-ring (4), (9) and the seal (8). (1) Accumulator Assembly...
Page 269 TRANSMISSION STW34, STW37, STW40, WSM Port Block and Charge Relief Valve 1. Separate the port block (2) after removing the mounting screws. 2. Remove the spring (3) and poppet L (4). 3. Remove the gasket (1) and the pipe (5).
Page 270 TRANSMISSION STW34, STW37, STW40, WSM Trunnion 1. Remove the internal snap ring (1) then tap out the trunnion (5) lightly with cover (4). (When reassembling) • Apply transmission oil to the O-rings and apply grease to the bushing (6) and (7).
Page 271: Mid Case
TRANSMISSION STW34, STW37, STW40, WSM (3) Mid Case Removing Hydraulic PTO Clutch 1. Remove the external snap rings (3), (5) and collar (4) on the 24T gear shaft (2). 2. Tap out the 24T gear shaft (2) with the hydraulic PTO clutch assembly (6).
Page 272 TRANSMISSION STW34, STW37, STW40, WSM Hydraulic PTO Clutch 1. Remove the bearing (1) and 17T gear (2). 2. Pull out the counter shaft (13), collar (11), bearing (12), 21T gear (10), needle bearing (9) and collar (8). 3. Remove the external snap ring (3) and pull put the collar (4) and stopper (5).
Page 273 TRANSMISSION STW34, STW37, STW40, WSM (Continued) 1. Remove the internal snap ring (31) and remove the pressure plate (28), steel plate (30) and clutch disc (29). 2. Hydraulic clutch pack can be disassembled as shown in figure. (When reassembling) • Apply transmission oil to the clutch disc (22), (29).
Page 274: Transmission Case
TRANSMISSION STW34, STW37, STW40, WSM (4) Transmission Case Front Drive Shaft and Mid Cover 1. Remove the cover (1). 2. Remove the joint shaft (3) and coupling. 3. Remove the front drive shaft (4) and 24T gear (5). 4. Remove the mid cover mounting screws and remove the hypoid pinion assembly (6), counter shaft assembly (10), mid cover (2) and shift fork (8) at the same time.
Page 275 TRANSMISSION STW34, STW37, STW40, WSM Hypoid Pinion Assembly and Rear Counter Shaft Assembly 1. Remove the hypoid pinion assembly (3), shim (2) and counter shaft assembly (4) from the mid cover (1). 2. Remove the stake of the lock nut (7) and remove it.
Page 276 TRANSMISSION STW34, STW37, STW40, WSM Separating Rear PTO Case and Mid PTO Case 1. Remove the drawbar bracket (3). 2. Remove the mounting screws and pull out the rear PTO case (1) with the gears and shafts on it. 3. Remove the mid PTO case (4).
Page 277 TRANSMISSION STW34, STW37, STW40, WSM Rear PTO Case 1. Pull out the PTO drive shaft (3) and mid PTO drive shaft (4) with gears while tapping out the PTO shaft (1). 2. Remove the gears and bearings on the PTO drive shaft (3), PTO shaft (1) and mid PTO drive shaft (4).
Page 278 TRANSMISSION STW34, STW37, STW40, WSM Mid-PTO Case and Shaft 1. Remove the oil seal (1) and internal snap ring (2). 2. Pull out the mid-PTO shaft (3). 3. Tap in the spring pin (5) to idle shaft (4), and pull out the idle shaft (4).
Page 279 TRANSMISSION STW34, STW37, STW40, WSM Differential Gear Assembly 1. Remove the differential bearing holder (1), noting the number of shims L (4). 2. Remove the differential gear as an assembly and the shims R (3). (When reassembling) • Install same number of shims as before disassembling.
Page 280 TRANSMISSION STW34, STW37, STW40, WSM Differential Pinion Shaft, Differential Pinion and Differential Side Gear 1. Remove the differential side gear (3) and shim (2). 2. Tap out the dowel pin (6). 3. Pull out the differential pinion shaft (7), then remove the differential pinions (5), thrust collars (4), differential side gear (10) and shim (9).
Page 281: Servicing
TRANSMISSION STW34, STW37, STW40, WSM [4] SERVICING (1) Bi-speed Hydraulic Clutch and Gears 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 282 TRANSMISSION STW34, STW37, STW40, WSM Clearance between Counter Shaft B and 27T Gear 1. Measure the counter shaft B O.D. with an outside micrometer. 2. Measure the 27T gear I.D. with an inside micrometer, and calculate the clearance. 3. If the clearance exceeds the allowable limit, replace.
Page 283: Hydraulic Pto Clutch And Gears
TRANSMISSION STW34, STW37, STW40, WSM (2) Hydraulic PTO Clutch and Gears Checking Bearing • See page 3-S70. 9Y1211109TRS0073US0 Clutch Disc Wear 1. Measure the clutch disc thickness with vernier calipers. 2. If the thickness is less than the allowable limit, replace it.
Page 284: Transmission Case
TRANSMISSION STW34, STW37, STW40, WSM Clearance between 21T Gear and Counter Shaft 1. Measure the 21T gear I.D. and counter shaft O.D.. 2. Measure the O.D. of two needles installed diagonally in the needle bearing. 3. Calculate the clearance. 4. If the clearance exceeds the allowable limit, replace.
Page 285 TRANSMISSION STW34, STW37, STW40, WSM Clearance between Hypoid Pinion Shaft and 29T Gear 1. Measure the 29T gear I.D. and hypoid pinion O.D.. 2. Calculate the clearance. 3. If the clearance exceeds the allowable limit, replace. 0.020 to 0.051 mm...
Page 286 TRANSMISSION STW34, STW37, STW40, WSM Clearance between Differential Case and Differential Side Gear 1. Measure the differential case I.D. and ring gear I.D. with an inside micrometer. 2. Measure the differential side gear boss O.D. with an outside micrometer and calculate the clearance.
Page 287 TRANSMISSION STW34, STW37, STW40, WSM Adjusting of Hypoid Pinion Motive Force 1. Assemble the hypoid pinion assembly and tighten the lock nut (2) lightly with new one. 2. Rotate the hypoid pinion with applying the transmission oil to the bearings after tapping the hypoid pinion to front and rear direction by the soft hammer.
Page 288 TRANSMISSION STW34, STW37, STW40, WSM Correcting of Tooth Contact 1. Proper contact. • No adjustment. 2. Correcting of the heel contact and shallow contact. • Change the bearing holder shim (1) to thick it. • Repeat above until the proper tooth contact and backlash are achieved.
Page 289: Rear Axle
REAR AXLE KiSC issued 11, 2014 A...
Page 290 MECHANISM CONTENTS 1. STRUCTURE..........................4-M1 2. FINAL REDUCTION SYSTEM ....................4-M2 KiSC issued 11, 2014 A...
Page 291 REAR AXLE STW34, STW37, STW40, WSM 1. STRUCTURE (1) Rear Axle Case (5) Rear Axle Shaft (9) Brake Case (13) Hypoid Ring Gear (2) Internal Gear (6) Planetary Carrier (10) Differential Lock Clutch (14) Transmission Case (3) Differential Lock Fork...
Page 292 REAR AXLE STW34, STW37, STW40, WSM 2. FINAL REDUCTION SYSTEM The final reduction system has a planetary gear system. It is compact, and is durable under heavy loads since torque loads are spread over three gears, decreasing the load on each tooth. And this system also spreads the load evenly around the circumference of the system, eliminating the sideways stress on the shafts.
Page 293 SERVICING CONTENTS 1. TROUBLESHOOTING.........................4-S1 2. SERVICING SPECIFICATIONS ....................4-S2 3. TIGHTENING TORQUES......................4-S3 4. DISASSEMBLING AND SERVICING ..................4-S4 [1] PREPARATION ........................4-S4 (1) Separating Rear Axle for ROPS ..................4-S4 (2) Separating Rear Axle for CABIN ...................4-S10 [2] DISASSEMBLING AND ASSEMBLING ................4-S15 [3] SERVICING .........................4-S16 KiSC issued 11, 2014 A...
Page 294: Troubleshooting
REAR AXLE STW34, STW37, STW40, WSM 1. TROUBLESHOOTING Probable Cause and Reference Symptom Solution Checking Procedure Page 1. Backlash between internal Replace or adjust backlash between 4-S16 Excessive or Unusual gear and planetary gear is internal gear and planetary gear.
Page 295: Servicing Specifications
REAR AXLE STW34, STW37, STW40, WSM 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Internal Gear to Planetary Gear Backlash 0.1 to 0.2 mm 0.5 mm 0.0039 to 0.0079 in. 0.020 in. Planetary Gear I.D. 30.009 to 30.025 mm 30.05 mm 1.1815 to 1.1821 in.
Page 296 REAR AXLE STW34, STW37, STW40, 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" on page G-10.) Item N·m kgf·m...
Page 297: Disassembling And Servicing
REAR AXLE STW34, STW37, STW40, WSM 4. DISASSEMBLING AND SERVICING [1] PREPARATION (1) Separating Rear Axle for ROPS Draining Transmission Fluid 1. Place an oil pan underneath the transmission case, and remove the drain plugs (1). 2. Drain the transmission fluid.
Page 298 REAR AXLE STW34, STW37, STW40, WSM Rear Wheel 1. Place the disassembling stand under the rear axles. 2. Remove the rear wheels (1). 3. Remove the Registration plate (3) with trailer electrical outlet (2). 4. Remove the combination lights (4) 196.1 to 225.6 N·m...
Page 299 REAR AXLE STW34, STW37, STW40, WSM Fender (Left Side) 1. Remove the fender covers (6) and the sponges (8), (9). 2. Remove the differential lock pedal (4) with the spring (5). 3. Remove the screws (3). 4. Remove the fender mounting screw (1).
Page 300 REAR AXLE STW34, STW37, STW40, WSM Auxiliary Control Valve 1. Remove the valve cover (8). 2. Remove the valve stay (3). 3. Remove the connecting rods (2). (When reassembling) • Reassemble the connecting rods (2) as shown in the figure.
Page 301 REAR AXLE STW34, STW37, STW40, WSM Fender (Right Side) 1. Remove the fender cover (2). 2. Remove the loader lever guide mounting nuts (5) and then open the loader lever guide (4). 3. Disconnect the connectors for PTO switch (3) and beacon switch (9).
Page 302 REAR AXLE STW34, STW37, STW40, WSM 3-Point Linkage and ROPS Under Frame 1. Remove the lifting rods (3). 2. Remove the lower links (5) with the check chains (6). 3. Remove the PTO shaft cover (4). 4. Remove the joint stay (1).
Page 303: Separating Rear Axle For Cabin
REAR AXLE STW34, STW37, STW40, WSM Rear Axle 1. Remove the setting screw (2) and pull out the lower link pin (3). 2. Place the disassembling stand under the rear axle case. 3. Remove the rear axle mounting screws and nuts, and separate the rear axle (1).
Page 304 REAR AXLE STW34, STW37, STW40, WSM Rear Wheel and 3-Point Linkage 1. Place the disassembling stand under the transmission case. 2. Remove the rear wheels (1). 3. Remove the top link (2), lift rods (3) and lower links (4). 4. Remove the drawbar (5).
Page 305 REAR AXLE STW34, STW37, STW40, WSM Release Wire and Wiring Harness (Left Side) 1. Remove the fender under cover (1). 2. Remove the release wire (3). 3. Remove the lever guide mounting screws (2), and then open the lever guide (4).
Page 306 REAR AXLE STW34, STW37, STW40, WSM Brake Linkage 1. Remove the brake rod (4). 2. Remove the parking brake rod (2). 3. Remove external snap ring and remove the brake lever (3). 4. Remove the cruise control rod (5). 5. Remove the range gear shift rod (6).
Page 307 REAR AXLE STW34, STW37, STW40, WSM Rear Axle 1. Remove the setting screw and pull out the lower link pin. 2. Place the disassembling stand under the rear axle case. 3. Remove the rear axle mounting screws and nuts, and separate the rear axle (1).
Page 308: Disassembling And Assembling
REAR AXLE STW34, STW37, STW40, WSM [2] DISASSEMBLING AND ASSEMBLING Planetary Gear 1. Remove the stopper (4), then remove the screw and washer (1). 2. Remove the planetary carrier (3) and planetary gears (2) as a unit. 3. Remove the bearing (7) with special use puller set (Code No.: 07916-09032).
Page 309 REAR AXLE STW34, STW37, STW40, WSM [3] 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 carrier and move the planetary gear to measure the backlash.
Page 310 BRAKES KiSC issued 11, 2014 A...
Page 311 MECHANISM CONTENTS 1. BRAKE LINKAGE ........................5-M1 2. OPERATION..........................5-M2 KiSC issued 11, 2014 A...
Page 312: Brake Linkage
BRAKES STW34, STW37, STW40, WSM 1. BRAKE LINKAGE (1) Rear Axle Case (2) Parking Brake Rod 2 (3) Parking Brake Shaft Assembly (4) Parking Brake Rod 1 (5) Parking Brake Lever (6) Brake Rod (7) Brake Pedal (8) Brake Lever Independent mechanical wet disc brakes are used for the right and left travelling brakes.
Page 313 BRAKES STW34, STW37, STW40, WSM 2. OPERATION (1) Brake Lever (4) Rear Axle Case (6) Brake Disc (8) Steel Ball (2) Brake Cam (5) Transmission Case (7) Brake Plate (9) Brake Shaft (3) Cam Plate  During Braking When the brake pedal depressed, the linkage causes the brake lever (1) and brake cam (2) to turn into the direction of arrow shown in the above diagram.
Page 314: Servicing
SERVICING CONTENTS 1. TROUBLESHOOTING.........................5-S1 2. SERVICING SPECIFICATIONS ....................5-S2 3. TIGHTENING TORQUES......................5-S3 4. CHECKING, DISASSEMBLING AND SERVICING ..............5-S4 [1] CHECKING AND ADJUSTING....................5-S4 [2] PREPARATION ........................5-S5 (1) Separating Rear Axle for ROPS ..................5-S5 (2) Separating Rear Axle for CABIN ...................5-S11 [3] SERVICING .........................5-S16 KiSC issued 11, 2014 A...
Page 315: Troubleshooting
BRAKES STW34, STW37, STW40, WSM 1. TROUBLESHOOTING Probable Cause and Reference Symptom Solution Checking Procedure Page 1. Brake pedal free travel is Adjust brake pedal free travel. 5-S4 Uneven Braking unevenly adjusted. Force 2. Brake disc is worn. Replace brake disc.
Page 316: Servicing Specifications
BRAKES STW34, STW37, STW40, WSM 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Brake Pedal Free Travel 20 to 30 mm – 0.79 to 1.18 in. Difference of Less than – Stroke 5 mm (R.H. and L.H.) 0.19 in. Parking Brake Lever...
Page 317 BRAKES STW34, STW37, STW40, 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" on page G-10.) Item N·m kgf·m lbf·ft...
Page 318: Checking, Disassembling And Servicing
BRAKES STW34, STW37, STW40, WSM 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING Brake Pedal Free Travel CAUTION • Stop the engine and chock the wheels before checking brake pedal. • The difference between the right and left pedal plays must be less than 5.0 mm (0.19 in.).
Page 319: Preparation
BRAKES STW34, STW37, STW40, WSM [2] PREPARATION (1) Separating Rear Axle for ROPS Draining Transmission Fluid 1. Place an oil pan underneath the transmission case, and remove the drain plugs (1). 2. Drain the transmission fluid. 3. Reinstall the drain plugs (1).
Page 320 BRAKES STW34, STW37, STW40, WSM Rear Wheel 1. Place the disassembling stand under the rear axles. 2. Remove the rear wheels (1). 3. Remove the Registration plate (3) with trailer electrical outlet (2). 4. Remove the combination lights (4) 196.1 to 225.6 N·m...
Page 321 BRAKES STW34, STW37, STW40, WSM Fender (Left Side) 1. Remove the fender covers (6) and the sponges (8), (9). 2. Remove the differential lock pedal (4) with the spring (5). 3. Remove the screws (3). 4. Remove the fender mounting screw (1).
Page 322 BRAKES STW34, STW37, STW40, WSM Auxiliary Control Valve 1. Remove the valve cover (8). 2. Remove the valve stay (3). 3. Remove the connecting rods (2). (When reassembling) • Reassemble the connecting rods (2) as shown in the figure. • After reassembling the valve stay (3), adjust to locate the control lever (9) at a central position of the guide slot with the turnbuckle (10).
Page 323 BRAKES STW34, STW37, STW40, WSM Fender (Right Side) 1. Remove the fender cover (2). 2. Remove the loader lever guide mounting nuts (5) and then open the loader lever guide (4). 3. Disconnect the connectors for PTO switch (3) and beacon switch (9).
Page 324 BRAKES STW34, STW37, STW40, WSM 3-Point Linkage and ROPS Under Frame 1. Remove the lifting rods (3). 2. Remove the lower links (5) with the check chains (6). 3. Remove the PTO shaft cover (4). 4. Remove the joint stay (1).
Page 325: Separating Rear Axle For Cabin
BRAKES STW34, STW37, STW40, WSM Rear Axle 1. Remove the setting screw (2) and pull out the lower link pin (3). 2. Place the disassembling stand under the rear axle case. 3. Remove the rear axle mounting screws and nuts, and separate the rear axle (1).
Page 326 BRAKES STW34, STW37, STW40, WSM Rear Wheel and 3-Point Linkage 1. Place the disassembling stand under the transmission case. 2. Remove the rear wheels (1). 3. Remove the top link (2), lift rods (3) and lower links (4). 4. Remove the drawbar (5).
Page 327 BRAKES STW34, STW37, STW40, WSM Release Wire and Wiring Harness (Left Side) 1. Remove the fender under cover (1). 2. Remove the release wire (3). 3. Remove the lever guide mounting screws (2), and then open the lever guide (4).
Page 328 BRAKES STW34, STW37, STW40, WSM Brake Linkage 1. Remove the brake rod (4). 2. Remove the parking brake rod (2). 3. Remove external snap ring and remove the brake lever (3). 4. Remove the cruise control rod (5). 5. Remove the range gear shift rod (6).
Page 329 BRAKES STW34, STW37, STW40, WSM Rear Axle 1. Remove the setting screw and pull out the lower link pin. 2. Place the disassembling stand under the rear axle case. 3. Remove the rear axle mounting screws and nuts, and separate the rear axle (1).
Page 330 BRAKES STW34, STW37, STW40, WSM [3] SERVICING Height of Cam Plate and Ball 1. Measure the dimensions of the cam plate with the ball installed. 2. If the measurement is less than the allowable limit, replace the cam plate and balls.
Page 331 BRAKES STW34, STW37, STW40, WSM Clearance between Brake Pedal Shaft and Brake Pedal 1. Measure the brake pedal shaft O.D. (bearing surface) with an outside micrometer. 2. Measure the brake pedal I.D. with a cylinder gauge. 3. Calculate the clearance.
Page 332: Front Axle
FRONT AXLE KiSC issued 11, 2014 A...
Page 333 MECHANISM CONTENTS 1. STRUCTURE..........................6-M1 KiSC issued 11, 2014 A...
Page 334 FRONT AXLE STW34, STW37, STW40, WSM 1. STRUCTURE (1) Front Axle (6) 11T Bevel Gear (11) Differential Side Gear (15) 16T Bevel Gear (2) Gear Case Cover (7) Front Axle Case (12) Differential Pinion (16) Differential Gear Shaft (3) 41T Bevel Gear...
Page 335: Servicing
SERVICING CONTENTS 1. TROUBLESHOOTING.........................6-S1 2. SERVICING SPECIFICATIONS ....................6-S2 3. TIGHTENING TORQUES......................6-S3 4. CHECKING, DISASSEMBLING AND SERVICING ..............6-S4 [1] CHECKING AND ADJUSTING....................6-S4 [2] DISASSEMBLING AND ASSEMBLING ................6-S5 (1) Separating Front Axle Assembly ..................6-S5 (2) Disassembling Front Axle Assembly ................6-S7 [3] SERVICING .........................6-S10 KiSC issued 11, 2014 A...
Page 336: Troubleshooting
FRONT AXLE STW34, STW37, STW40, WSM 1. TROUBLESHOOTING Probable Cause and Reference Symptom Solution Checking Procedure Page 1. Tire pressure is uneven. Adjust tire pressure. G-50 Front Wheels Wander to Right or Left 2. Toe-in is improper. Adjust toe-in. 6-S4 3.
Page 337: Servicing Specifications
FRONT AXLE STW34, STW37, STW40, WSM 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Front Wheel Alignment Toe-in 2 to 8 mm – 0.079 to 0.315 in. Front Axle Rocking Force 49.0 to 117.7 N – 5.0 to 12.0 kgf 11.0 to 26.5 lbf...
Page 338 FRONT AXLE STW34, STW37, STW40, 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" on page G-10.) Item N·m kgf·m...
Page 339: Tightening Torques
FRONT AXLE STW34, STW37, STW40, WSM 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING Adjusting Toe-in 1. Park the tractor on the flat place. 2. Inflate the tires to the specified pressure. 3. Turn the steering wheel so that the front wheels are in the straight ahead position.
Page 340: Disassembling And Assembling
FRONT AXLE STW34, STW37, STW40, WSM [2] DISASSEMBLING AND ASSEMBLING (1) Separating Front Axle Assembly Draining Front Axle Case Oil 1. Place the oil pans underneath the front axle case. 2. Remove the both right and left hand side drain plugs (2) and filling plug (1) to drain the oil.
Page 341 FRONT AXLE STW34, STW37, STW40, WSM Front Wheels and Steering Cylinder Hoses 1. Lift up the front side of tractor and place the disassembling stand under the front axle frame. 2. Remove the front wheels. 3. Disconnect the delivery hoses (1), (3).
Page 342: Disassembling Front Axle Assembly
FRONT AXLE STW34, STW37, STW40, WSM (2) Disassembling Front Axle Assembly Steering Cylinder, Axle Bracket and Front Wheel Turning Angle Sensor 1. Remove the slotted nut and remove the both R.H. and L.H. tie-rod (6). 2. Remove the front axle brackets (3), (7).
Page 343 FRONT AXLE STW34, STW37, STW40, WSM Gear Case Cover and Front Axle 1. Remove the gear case cover (2) from the front gear case (1). 2. Remove the bearing (6) with special use puller set (Code No.: 07916-09032). 3. Remove the 41T bevel gear (5).
Page 344 FRONT AXLE STW34, STW37, STW40, WSM Spiral Bevel Pinion Shaft and Differential Gear Assembly 1. Remove the oil seal (1) and internal snap ring (2). 2. Remove the collar (3). 3. Remove the plug (10), (11). 4. Tap out the spiral bevel pinion shaft (4) to the rear side.
Page 345: Servicing
FRONT AXLE STW34, STW37, STW40, WSM Differential Gear 1. Remove the spiral bevel gear (6) with bearing (5) and bearing (1) with the puller. 2. Tap out the spring pin (2) and pull out the differential pinion shaft (3). 3. Remove the differential pinion (7) and differential side gear (9).
Page 346 FRONT AXLE STW34, STW37, STW40, WSM Backlash between Differential Pinion and Differential Side Gear 1. Set a dial gauge (lever type) on a tooth of the differential pinion. 2. Fix the differential side gear and move the differential pinion to measure the backlash.
Page 347 FRONT AXLE STW34, STW37, STW40, WSM Adjusting Backlash and Tooth Contact between Spiral Bevel Pinion Shaft and Spiral Bevel Gear 1. Set a dial gauge (lever type) with its finger on the spline of spiral bevel pinion shaft. 2. Measure the backlash by moving the spiral bevel pinion shaft by hand lightly.
Page 348 FRONT AXLE STW34, STW37, STW40, 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 9Y1211109FAS0022US0 •...
Page 349 FRONT AXLE STW34, STW37, STW40, WSM Backlash between 7T Pinion Shaft and 41T Bevel Gear 1. Stick a strip of fuse to three spots on the 41T bevel gear (1) with grease. 2. Fix the gear case cover and gear case.
Page 350 STEERING KiSC issued 11, 2014 A...
Page 351 MECHANISM CONTENTS 1. STRUCTURE..........................7-M1 2. HYDRAULIC CIRCUIT FOR POWER STEERING..............7-M2 3. HYDRAULIC PUMP........................7-M3 4. STEERING CONTROLLER......................7-M4 [1] CONTROL VALVE ....................... 7-M4 [2] METERING DEVICE (GEROTOR)..................7-M4 [3] OIL FLOW ..........................7-M5 5. STEERING CYLINDER ......................7-M7 KiSC issued 11, 2014 A...
Page 352: Structure
STEERING STW34, STW37, STW40, WSM 1. STRUCTURE (1) Hydraulic Pump (4) HST Oil Filter (7) Steering Cylinder To Oil Cooler (2) Regulating Valve (5) Filter Bracket (8) Steering Wheel (3) Steering Controller (6) HST (Hydrostatic Transmission) This tractor is equipped with a full hydrostatic power steering. The steering controller (3) is connected to the steering cylinder (7) with the hydraulic hose only, therefore it is simple in construction.
Page 353: Hydraulic Circuit For Power Steering
STEERING STW34, STW37, STW40, WSM 2. HYDRAULIC CIRCUIT FOR POWER STEERING When the engine starts, the hydraulic pump (12) pressurize oil from transmission case through the regulator valve (10) and send the oil, to the steering controller (3). The oil which has entered steering controller (3) is directed to control valve (2).
Page 354 STEERING STW34, STW37, STW40, WSM 3. HYDRAULIC PUMP The gear type hydraulic pump is adopted for these models. This pump is called as tandem type and composed two pair of gears, side plates, bushings and other components as shown in the figure.
Page 355 STEERING STW34, STW37, STW40, WSM 4. STEERING CONTROLLER The steering controller mainly consists of a control valve, a metering device and a relief valve. The metering device comprises a set of special gears called "Gerotor". (1) Dowel Pin (6) Centering Spring...
Page 356: Steering Controller
STEERING STW34, STW37, STW40, WSM [3] OIL FLOW Neutral Position When the steering wheel (1) is not being turned, valve plate (2) is held in the neutral position by centering spring. Under this condition, an oil passage is formed between P port (from pump) and T port (to transmission case) in the control valve, and all oil from the hydraulic pump flows to T port.
Page 357 STEERING STW34, STW37, STW40, WSM Left Turn The steering system operates in the same way at a left-turn as well, except that oil flows into and out of steering cylinder in the directions opposite to those at a right-turn. (1) Steering Wheel...
Page 358 STEERING STW34, STW37, STW40, WSM 5. STEERING CYLINDER (1) Rod Assembly (3) Cylinder Tube (5) Cover (7) Rod Gasket (2) Packing (4) O-ring (6) Dust Seal (8) Bushing The steering cylinder is single piston both rod double-acting type. This steering cylinder is installed parallel to the front axle and connected to tie-rods.
Page 359 SERVICING CONTENTS 1. TROUBLESHOOTING.........................7-S1 2. SERVICING SPECIFICATIONS ....................7-S3 3. TIGHTENING TORQUES......................7-S4 4. CHECKING, DISASSEMBLING ....................7-S5 [1] CHECKING AND ADJUSTING....................7-S5 [2] DISASSEMBLING AND ASSEMBLING ................7-S6 (1) Steering Controller......................7-S6 (2) Steering Cylinder ......................7-S9 KiSC issued 11, 2014 A...
Page 360: Troubleshooting
STEERING STW34, STW37, STW40, WSM 1. TROUBLESHOOTING Probable Cause and Reference Symptom Solution Checking Procedure Page 1. Steering controller is Replace steering controller. 7-S8 Tractor Can Not Be damaged. Steered 2. Steering hose is damaged. Replace steering hose. 7-S8 1. Hydraulic pump is Replace hydraulic pump.
Page 361 STEERING STW34, STW37, STW40, WSM Probable Cause and Reference Symptom Solution Checking Procedure Page 1. Air is sucked in pump due Fill transmission fluid. G-8, 7-S5 Front Wheels Wander to leak of oil. Bleed air from the hydraulic system by...
Page 362: Servicing Specifications
STEERING STW34, STW37, STW40, WSM 2. SERVICING SPECIFICATIONS STEERING WHEEL Item Factory Specification Allowable Limit Steering Wheel Operating Torque 1.5 to 2.5 N·m – 0.16 to 0.25 kgf·m 1.1 to 1.8 lbf·ft 9Y1211109STS0002US0 7-S3 KiSC issued 11, 2014 A...
Page 363 STEERING STW34, STW37, STW40, 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" on page G-10.) Item N·m kgf·m lbf·ft...
Page 364: Checking, Disassembling
STEERING STW34, STW37, STW40, WSM 4. CHECKING, DISASSEMBLING [1] CHECKING AND ADJUSTING NOTE • Refer to the "8. HYDRAULIC SYSTEM" for hydraulic pump and steering controller. IMPORTANT • Use only the transmission fluid (see page G-8), in no case mixture of oils of different brands.
Page 365: Disassembling And Assembling
STEERING STW34, STW37, STW40, WSM [2] DISASSEMBLING AND ASSEMBLING (1) Steering Controller Hood, Side Cover and Battery Cord 1. To open the hood (1), hold the hood (1) and pull the release lever (3) and open the hood (1). 2. Remove the bolt from each of the side covers and remove the side covers (2).
Page 366 STEERING STW34, STW37, STW40, WSM Instrument Panel 1. Remove the instrument panel mounting screws and disconnect the instrument panel connector (2). Then remove the instrument panel (1). 2. Disconnect the combination switch connector (6), main switch connector (3) and hazard switch connector (4).
Page 367: Steering Controller
STEERING STW34, STW37, STW40, WSM Power Steering Hoses and Accelerator Wire (Right Side) 1. Disconnect the accelerator wire (1) from the engine. 2. Disconnect the fuel hose (2). 3. Disconnect the delivery hose L.H. (3) and delivery hose R.H. (4) from the steering controller.
Page 368: Steering Cylinder
STEERING STW34, STW37, STW40, WSM (2) Steering Cylinder Removing Steering Cylinder • See page 6-S7. 9Y1211109STS0011US0 Disassembling Steering Cylinder 1. Remove the rod joint (3) from the cylinder rod (2). 2. Draw out the cylinder cover (11). 3. Draw out the cylinder rod (2).
Page 369: Hydraulic System
HYDRAULIC SYSTEM KiSC issued 11, 2014 A...
Page 370 MECHANISM CONTENTS 1. STRUCTURE..........................8-M1 2. WHOLE HYDRAULIC CIRCUIT ....................8-M2 3. HYDRAULIC PUMP........................8-M5 4. REGULATOR VALVE......................... 8-M6 5. BI-SPEED VALVE ........................8-M8 [1] HYDRAULIC CIRCUIT ......................8-M8 [2] OIL FLOW ..........................8-M9 6. 3-POINT HYDRAULIC SYSTEM ....................8-M10 [1] HYDRAULIC CIRCUIT .......................
Page 371: Structure
HYDRAULIC SYSTEM STW34, STW37, STW40, WSM 1. STRUCTURE (1) Auxiliary Control Valve (4) Steering Controller (7) 3P Hydraulic Pump (11) Bi-speed Valve (2) Hydraulic Cylinder (5) Power Steering Hydraulic (8) Oil Cooler (12) HST Oil Filter (3) Hydrostatic Transmission Pump...
Page 372: Whole Hydraulic Circuit
HYDRAULIC SYSTEM STW34, STW37, STW40, WSM 2. WHOLE HYDRAULIC CIRCUIT (1) Transmission case (5) Hydraulic Block Type Outlet (8) Lowering Speed Adjusting (10) Position Control Valve (2) Oil Filter (6) Relief Valve Valve (3) Hydraulic Pump (3P System) (7) Auxiliary Control Valve...
Page 373: Hydraulic Pump
HYDRAULIC SYSTEM STW34, STW37, STW40, WSM (Continued) (11) Hydraulic Pump (Power (14) Steering Controller (17) Oil Cooler (21) Bi-speed Valve Steering) (15) HST Oil Filter (18) Hydraulic Clutch (Bi-speed) (12) Regulator Valve (16) Hydrostatic Transmission (19) Hydraulic Clutch (PTO) Continue to Last Page...
Page 374 HYDRAULIC SYSTEM STW34, STW37, STW40, WSM (Continued) Specification of Hydraulic Parts [I-PTO System Pressure] (11) Above. 18.6 L/min. (4.91 U.S.gals/min., 4.09 Imp.gals/min.) 1.76 to 1.86 MPa (18.0 to 18.9 kgf/cm , 256 to 269 psi) (21) [Power Steering Relief Valve]...
Page 375 HYDRAULIC SYSTEM STW34, STW37, STW40, WSM 3. HYDRAULIC PUMP The hydraulic pump is tandem type, front side is the 3P hydraulic pump (3) and rear side is the power steering hydraulic pump (4). This pump consists of two pairs of gears, side plates, bushing and other components as shown in the figure.
Page 376 HYDRAULIC SYSTEM STW34, STW37, STW40, WSM 4. REGULATOR VALVE The regulator valve (1) is installed on the power steering pump, regulating the oil pressure of the hydraulic PTO clutch and bi-speed clutch circuit. (1) Regulator Valve A Port (2) 3P Hydraulic Pump...
Page 377 HYDRAULIC SYSTEM STW34, STW37, STW40, WSM Oil Flow The oil from the power steering pump passes through the regulating valve (3) and check valve (4), and then flows to the power steering circuit. The regulating valve (3) is provided to keep the inlet pressure of the pressure reducing valve (5) to 30 kgf/cm except when the power steering is operated.
Page 378: Bi-Speed Valve
HYDRAULIC SYSTEM STW34, STW37, STW40, WSM 5. BI-SPEED VALVE The bi-speed valve (1) is installed on a right side of the clutch housing into which the bi-speed clutch is built. The solenoid valve (2) and (3) are built into the...
Page 379: Oil Flow
HYDRAULIC SYSTEM STW34, STW37, STW40, WSM [2] OIL FLOW (1) Regulator Valve (2) Bi-speed Valve (3) PTO Hydraulic Clutch (4) Accumulator (5) Bi-speed Hydraulic Clutch (6) Orifice Valve (7) Solenoid Valve (Bi-speed) (8) Solenoid Valve (PTO) A Port (To Bi-speed...
Page 380: Point Hydraulic System
HYDRAULIC SYSTEM STW34, STW37, STW40, WSM 6. 3-POINT HYDRAULIC SYSTEM [1] HYDRAULIC CIRCUIT (1) Auxiliary Control Valve (4) Hydraulic Piston (8) Hydraulic Pump (3P) To Hydraulic Pump (2) Hydraulic Cylinder (5) Position Control Valve (9) Engine (Power Steering) (3) Lowering Speed Adjusting...
Page 381: Feedback Linkage
HYDRAULIC SYSTEM STW34, STW37, STW40, WSM [2] FEEDBACK LINKAGE (1) Position Control Lever (2) Feedback Rod (3) Lift Arm (4) Feedback Lever (5) Control Valve (6) Spool (7) Spool Drive Lever (8) Control Arm (9) Position Arm (10) Feedback Arm Position control is a mechanism to raise or lower the implement attached to the tractor in proportion to the movement of the control lever.
Page 382 HYDRAULIC SYSTEM STW34, STW37, STW40, WSM  Lifting 1. When the position control lever is moved to the LIFT position, the control arm (2) rotates to the arrow. Therefore, the spool drive lever (1) moves around the fulcrum P and pull the spool (3) opening the LIFT circuit.
Page 383: Position Control Valve
HYDRAULIC SYSTEM STW34, STW37, STW40, WSM  Lowering 1. When the position control lever is moved to the Lowering position, the control arm (2) rotates to the arrow. Therefore, the spool drive lever (1) moves around the fulcrum P and push the spool (3) and poppet 2 (4) opening the Lowering circuit.
Page 384 HYDRAULIC SYSTEM STW34, STW37, STW40, WSM  Lifting When the control lever is moved to "UP" position, spool (3) is pulled by the spool operating lever, forming a circuit with the P port and chamber A. The pressurized oil thus flows into the chamber A and closes unload poppet 1 (4).
Page 385: Relief Valve
HYDRAULIC SYSTEM STW34, STW37, STW40, WSM [4] RELIEF VALVE The 3-point hydraulic circuit has a relief valve to restrict the maximum pressure in its circuit. This is a guide piston relief valve with damper, a direct acting relief valve suitable for relatively high...
Page 386: Hydraulic Cylinder
HYDRAULIC SYSTEM STW34, STW37, STW40, WSM [5] HYDRAULIC CYLINDER (1) Lowering Speed Adjusting (5) Hydraulic Piston (10) Hydraulic Arm Shaft (14) P0 Port (Pump Port) Valve (6) O-ring (11) Control Arm (15) P1 Port (2) Cylinder Head (7) Back-up Ring...
Page 387: Hydraulic Block Type Outlet
HYDRAULIC SYSTEM STW34, STW37, STW40, WSM 7. HYDRAULIC BLOCK TYPE OUTLET The hydraulic block type outlet is located at the right hand side of the clutch housing. This hydraulic block type outlet is provided to take power out from the tractor to operate the hydraulic cylinders on the implement, such as front end loader, front blade and so on.
Page 388: Auxiliary Control Valve
HYDRAULIC SYSTEM STW34, STW37, STW40, WSM 8. AUXILIARY CONTROL VALVE [1] HYDRAULIC CIRCUIT This auxiliary control valve is a unit for three valves as single / double acting valve, double acting valve and single acting valve. The pressured oil into the three each control valve with parallel connection through the P port.
Page 389 HYDRAULIC SYSTEM STW34, STW37, STW40, WSM  Neutral While the spools (4), (5), (7) are in neutral position, the pressure-fed oil from the hydraulic pump is delivered into the P port and flows to 3-point linkage control valve through PB port.
Page 390 HYDRAULIC SYSTEM STW34, STW37, STW40, WSM  Double Acting Valve – Down When the spool (3) moves to right, the passage from P port to PB port is closed. The pressure-fed oil opens the check valve (2) and flows to implement cylinder via port.
Page 391 HYDRAULIC SYSTEM STW34, STW37, STW40, WSM  Single / Double Acting Valve – Lift (Single Acting) When this valve is used in single acting mode, the selecting valve (2) is turned clockwise to open the passage from selecting valve (2) to transmission case.
Page 392 HYDRAULIC SYSTEM STW34, STW37, STW40, WSM  Single Acting Valve – Lift When the spool (6) moves to right, the oil passage from P port to PB port is blocked by the spool (6). The pressure-fed oil opens the check valve (1) and flows to implement cylinder via unload valve (5) and B port.
Page 393 SERVICING CONTENTS 1. TROUBLESHOOTING.........................8-S1 2. SERVICING SPECIFICATIONS ....................8-S3 3. TIGHTENING TORQUES......................8-S5 4. CHECKING, DISASSEMBLING AND SERVICING ..............8-S6 [1] CHECKING AND ADJUSTING....................8-S6 (1) Hydraulic Pump (Power Steering) ...................8-S6 (2) Hydraulic Pump (3-Point Hydraulic System) ..............8-S8 (3) Regulator Valve .......................8-S9 (4) Regulator Valve ......................8-S10 (5) 3-Point Hydraulic System ....................8-S11 [2] DISASSEMBLING AND ASSEMBLING ................8-S14 (1) Hydraulic Pump (Power Steering and 3-Point Hydraulic System).........8-S14...
Page 394: Troubleshooting
HYDRAULIC SYSTEM STW34, STW37, STW40, WSM 1. TROUBLESHOOTING Probable Cause and Reference Symptom Solution Checking Procedure Page 1. Control linkage is adjusted Adjust control linkage. 8-S11 Implement Does Not improperly. Rise (Without Relief Valve Function Noise) 2. Control linkage improperly Repair or replace control linkage.
Page 395 HYDRAULIC SYSTEM STW34, STW37, STW40, WSM Probable Cause and Reference Symptom Solution Checking Procedure Page 1. Hydraulic cylinder is worn Replace hydraulic cylinder. 8-S14 Implement Drops by or damaged. Weight 2. Hydraulic piston and Replace hydraulic piston and O-ring. 8-S18 O-ring is worn or damaged.
Page 396: Servicing Specifications
HYDRAULIC SYSTEM STW34, STW37, STW40, WSM 2. SERVICING SPECIFICATIONS HYDRAULIC PUMP Item Factory Specification Allowable Limit Hydraulic Pump (Power Steering) Delivery at 18.6 L/min. – No Pressure 4.91 U.S.gals/min. Condition • Engine Speed: 4.09 Imp.gals/min. Approx. 2700 min (rpm) • Rated pressure: Delivery at 18.2 L/min.
Page 397 HYDRAULIC SYSTEM STW34, STW37, STW40, WSM HYDRAULIC CYLINDER (3P HYDRAULIC SYSTEM) Item Factory Specification Allowable Limit Cylinder Bore I.D. 75.06 to 75.10 mm 75.20 mm 2.9551 to 2.9567 in. 2.9606 in. Hydraulic Arm Shaft to Bushing Clearance (Right) 0.120 to 0.210 mm 0.30 mm...
Page 398 HYDRAULIC SYSTEM STW34, STW37, STW40, 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" on page G-10.) Item N·m kgf·m...
Page 399: Checking, Disassembling And Servicing
HYDRAULIC SYSTEM STW34, STW37, STW40, WSM 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING (1) Hydraulic Pump (Power Steering) Flowmeter Connecting and Test Preparation IMPORTANT • When using a flowmeter other than KUBOTA specified flowmeter (Code No.: 07916-52792), be sure to use the instructions with that flowmeter.
Page 400 HYDRAULIC SYSTEM STW34, STW37, STW40, WSM Pump Test NOTE • Before pump testing, perform the flowmeter connecting and test preparation. 1. Open the loading valve completely. 2. Start the engine and set at approx. 2700 min (rpm). 3. Read and note the pump delivery at no pressure.
Page 401: Hydraulic Pump (3-Point Hydraulic System)
HYDRAULIC SYSTEM STW34, STW37, STW40, WSM (2) Hydraulic Pump (3-Point Hydraulic System) Flowmeter Connecting and Test Preparation IMPORTANT • When using a flowmeter other than KUBOTA specified flowmeter (Code No.: 07916-52792), be sure to use the instructions with that flowmeter.
Page 402: Regulator Valve
HYDRAULIC SYSTEM STW34, STW37, STW40, WSM Pump Test NOTE • Before pump testing, perform the flowmeter connecting and test preparation. 1. Open the loading valve completely. 2. Start the engine and set at approx. 2700 min (rpm). 3. Read and note the pump delivery at no pressure.
Page 403 HYDRAULIC SYSTEM STW34, STW37, STW40, WSM Checking Bi-speed / PTO System Pressure 1. Start the engine and warm up the transmission fluid, and then stop the engine. 2. Remove the bi-speed system pressure checking port (PT 1/8) (1) plug (PT 1/8) on the bi-speed valve (2).
Page 404: 3-Point Hydraulic System
HYDRAULIC SYSTEM STW34, STW37, STW40, WSM (5) 3-Point Hydraulic System Adjusting Feedback Rod 1. Set the position control lever (1) to the floating position. 2. Start the engine, and after warming-up, set the engine speed at 1000 to 1500 min (rpm).
Page 405 HYDRAULIC SYSTEM STW34, STW37, STW40, WSM Relief Valve Setting Pressure Test Using Pressure Tester 1. Start the engine and move the position control lever to the maximum raising position. 2. Turn the feedback rod adjusting nut and lock nut until the relief valve begins to be operated.
Page 406 HYDRAULIC SYSTEM STW34, STW37, STW40, WSM Adjusting Position Control Lever Operating Force 1. Set a spring balance to the position control lever (1) to measure the operating force. 2. If the measurement is not within the factory specification, loosen the lock nut (3) and adjust the operating force with position control lever mounting nut (2).
Page 407: Disassembling And Assembling
HYDRAULIC SYSTEM STW34, STW37, STW40, WSM [2] DISASSEMBLING AND ASSEMBLING (1) Hydraulic Pump (Power Steering and 3-Point Hydraulic System) IMPORTANT • The hydraulic pump is precision machined and assembled: if disassembled once, it may be unable to keep its original performance. Therefore, when the hydraulic pump fails, replacement should be carried out with the hydraulic pump assembled except when emergency repair is unavoidable.
Page 408 HYDRAULIC SYSTEM STW34, STW37, STW40, WSM (Continued) 6. Loosen the clump and separate the suction hose (17) from the hydraulic pump (8). 7. Disconnect the 3P delivery pipe (16) from the hydraulic pump (14). 8. Remove the mounting screws (15) and remove the hydraulic pump (14).
Page 409: Bi-Speed Valve
HYDRAULIC SYSTEM STW34, STW37, STW40, WSM 3) Hydraulic Pump Running-in After reassembly, perform running-in operation in the following manner, and check the pump for abnormality before use. If the pump temperature should rise noticeably during running-in, recheck should be performed.
Page 410: Position Control Valve (3-Point Hydraulic System)
HYDRAULIC SYSTEM STW34, STW37, STW40, WSM (3) Position Control Valve (3-Point Hydraulic System) IMPORTANT • The position control valve has been precisely machined, assembled and adjusted. • It is advisable not to disassemble it, except the unload poppet 1, unload poppet 2 and poppet 1.
Page 411: Hydraulic Cylinder Cover (3-Point Hydraulic System)
HYDRAULIC SYSTEM STW34, STW37, STW40, WSM (4) Hydraulic Cylinder Cover (3-Point Hydraulic System) Hydraulic Cylinder Cover and Piston 1. Remove the hydraulic cylinder cover (3). 2. Push out the piston from inside of hydraulic cylinder block (1). (When reassembling) • Install the piston (2), noting O-ring (5) and back-up ring (4).
Page 412: Hydraulic Cylinder (3-Point Hydraulic System)
HYDRAULIC SYSTEM STW34, STW37, STW40, WSM (5) Hydraulic Cylinder (3-Point Hydraulic System) Lift Arm and Hydraulic Arm Shaft 1. Remove the position control rod (2). 2. Remove the external snap ring and tap out the lift arm L.H. (4). 3. Pull out the lift arm R.H. (7) and hydraulic arm shaft (6) as a unit.
Page 413: Auxiliary Control Valve
HYDRAULIC SYSTEM STW34, STW37, STW40, WSM (6) Auxiliary Control Valve Removing Auxiliary Control Valve • See page 3-S24, 3-S36. 9Y1211109HYS0034US0 Auxiliary Control Valve (1) Plug (2) Spring (3) Poppet (4) Poppet Seat (5) Pilot Valve (6) Check Valve (7) Spring...
Page 414: Servicing
HYDRAULIC SYSTEM STW34, STW37, STW40, WSM [3] SERVICING (1) Hydraulic Pump (Power Steering and 3-Point Hydraulic System) Housing Bore (Depth of Scratch) 1. Check for the scratch on the interior surface of the housing caused by the gear. 2. If the scratch reaches more than half the area of the interior surface of the housing, replace at pump assembly.
Page 415: Hydraulic Cylinder
HYDRAULIC SYSTEM STW34, STW37, STW40, WSM (2) Hydraulic Cylinder Hydraulic Cylinder Bore 1. Check the cylinder internal surface for scoring or damage. 2. Measure the cylinder I.D. with a cylinder gauge. 3. If the measurement exceeds the allowable limit, replace.
Page 416 ELECTRICAL SYSTEM KiSC issued 11, 2014 A...
Page 417 MECHANISM CONTENTS 1. WIRING DIAGRAM........................9-M1 [1] ROPS MODEL........................9-M1 [2] CABIN MODEL ........................9-M2 2. STARTING SYSTEM........................9-M4 [1] ROPS MODEL........................9-M4 [2] CABIN MODEL ........................9-M6 (1) Glow Control System...................... 9-M7 [3] OPERATOR PRESENCE CONTROL .................. 9-M8 (1) Operator Presence Control System................9-M8 (2) Engine Starting Conditions and Automatic Engine Stop ..........
Page 418: Wiring Diagram
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM 1. WIRING DIAGRAM [1] ROPS MODEL 9-M1 KiSC issued 11, 2014 A...
Page 419 ELECTRICAL SYSTEM STW34, STW37, STW40, WSM [2] CABIN MODEL 9-M2 KiSC issued 11, 2014 A...
Page 420 ELECTRICAL SYSTEM STW34, STW37, STW40, WSM 9Y1211109ELM0021US0 9-M3 KiSC issued 11, 2014 A...
Page 421: Starting System
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM 2. STARTING SYSTEM [1] ROPS MODEL (1) Battery (8) Mains Switch (15) Glow Indicator Lamp (22) OPC Controller (2) Starter (9) Fuse (5A) (16) Parking Brake Lamp (23) Speed Control Pedal Switch (3) Clutch Pedal Switch...
Page 422 ELECTRICAL SYSTEM STW34, STW37, STW40, WSM (Continued) When the main switch is turned to the PREHEAT position, the terminal B is connected to the terminals G and IG. The glow plugs become red-hot, and at the same time, glow indicator lamp lights on.
Page 423 ELECTRICAL SYSTEM STW34, STW37, STW40, WSM [2] CABIN MODEL (1) Battery (9) Fuse (10A) (16) Glow Indicator Lamp (23) Speed Control Pedal Switch (2) Starter (10) Fuse (5A) (17) PTO Clutch Control Switch (HST) (3) Clutch Pedal Switch (11) Fuse (10A)
Page 424 ELECTRICAL SYSTEM STW34, STW37, STW40, WSM (1) Glow Control System STW34, 37 and 40 Cabin Model Tractor are equipped quick glow system (QGS) to control energizing time to the glow plugs (6) by means of coolant temperature of the engine.
Page 425: Operator Presence Control
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM [3] OPERATOR PRESENCE CONTROL (1) Operator Presence Control System STW 34, 37, 40 are configured with an "Operator Presence Control (OPC)" system to control engine starting automatically stopping. This OPC system mainly consists of controller and engine starting / stopping control switches such as the speed control pedal switch (HST), the seat switch, the rear PTO switch, the mid PTO switch and the parking brake switch.
Page 426 ELECTRICAL SYSTEM STW34, STW37, STW40, WSM OPC Controller A controller (1) is located inside under the steering wheel. The current from the main switch (11), safety switches flows to controller (1). The controller (1) receives a current as data, processes the data, and sends out current computing results to starter motor (7), key stop solenoid relay (8), and key stop solenoid (9).
Page 427: Engine Starting Conditions And Automatic Engine Stop
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM (2) Engine Starting Conditions and Automatic Engine Stop When the following conditions become complete, electric current (12 V) reaches starter S terminal through operator presence controller main switch and the engine can be started.
Page 428: Charging System
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM 3. CHARGING SYSTEM (1) Battery (2) Slow Blow Fuse (Main) (3) Slow BLow Fuse (Main Switch) (4) Main Switch (5) Fuse (6) Charge Lamp (7) Alternator The charging system supplies electric power for various devices and also charges the battery while the engine runs.
Page 429: Lighting System
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM 4. LIGHTING SYSTEM (1) Battery (10) Flasher Relay (19) Brake Light Switch (28) Position Light (Right) (2) Fuse (Main) (11) Flasher Unit (20) Head Light (29) Turn Light (Left) (3) Slow Blow Fuse (Main Switch)
Page 430 ELECTRICAL SYSTEM STW34, STW37, STW40, WSM [1] FLASHER UNIT The function of flasher unit is as follows. 1. The flasher unit blinks the turn signal light (3), (4) and hazard indicator light (2) when the hazard switch (9) is turned on.
Page 431: Brake Light Switch
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM [2] BRAKE LIGHT SWITCH When the brake pedal is not operated, the brake switch is pushed with the lever (2), and turned off. The lever (2) rotates counterclockwise by the brake link (3) when both brake pedals are depressed at the same time.
Page 432: Bi-Speed Turn System
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM 5. BI-SPEED TURN SYSTEM [1] ELECTRICAL CIRCUIT (1) Battery (5) Fuse (9) Mid PTO Lamp (13) Cap (2) Fuse (Main) (6) Alternator (10) Bi-speed Lamp (14) Bi-speed Controller (3) Fuse (Main Switch) (7) Instrument Panel...
Page 433: System Outline
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM [2] SYSTEM OUTLINE (1) Instrument Panel (3) Bi-speed Controller (5) Front Wheel Angle Sensor (7) CAN-L (2) Bi-speed Solenoid Valve (4) Travelling Speed Sensor (6) Alternator (8) CAN-H (General Information for Bi-speed Controller) • Bi-speed controller (ECU) processes and judges the input signals from the switches and sensors, and sends the signals to Bi -speed solenoid valves concerned with the bi-speed control system.
Page 434: Bi-Speed Turn System
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM [3] BI-SPEED TURN SYSTEM (1) Feature It is used hydraulic and electrical control type bi-speed turn system. The front wheel rotates by 1.5 times the speed compared with normal 4WD when the following conditions become complete.
Page 435 ELECTRICAL SYSTEM STW34, STW37, STW40, WSM Front Wheel Turning Angle Sensor This sensor perceives the steered angle of the front wheel. (1) Front Wheel Turning Angle Sensor 9Y1211109ELM0026US0 Travelling Speed Sensor This sensor perceives the traveling speed. (1) Traveling Speed Sensor...
Page 436: Instrument Panel
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM 6. INSTRUMENT PANEL [1] SYSTEM OUTLINE Instrument panel (ECU) and Bi-speed controller (ECU) (Controller Area Network) communication to share information from various sensors and switches. The indicators of the rear PTO (2), mid PTO (3) and Bi-speed (4) on the instrument panel (1) are controlled by CAN.
Page 437 SERVICING CONTENTS 1. TROUBLESHOOTING.........................9-S1 2. SERVICING SPECIFICATIONS ....................9-S9 3. TIGHTENING TORQUES......................9-S10 4. CHECKING, DISASSEMBLING AND SERVICING ..............9-S11 [1] CHECKING AND ADJUSTING....................9-S11 (1) Battery ...........................9-S11 (2) Main Switch (ROPS Model)...................9-S12 (3) Main Switch (CABIN Model) ..................9-S14 (4) Fail Safe System (Bi-speed Turn System) ..............9-S15 (5) Fine Adjustment (Bi-speed Turn System)..............9-S16 (6) Self Diagnosis (Bi-speed Turn System).................9-S17 (7) Bi-speed Restraint Check (Bi-speed Turn System)............9-S18...
Page 438: Troubleshooting
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM 1. TROUBLESHOOTING Probable Cause and Reference Symptom Solution Checking Procedure Page 1. Battery is discharged or Recharge or replace battery. G-29 All Electrical damaged. Equipment Do Not Operate 2. Battery positive cable Connect the battery positive cable...
Page 439 ELECTRICAL SYSTEM STW34, STW37, STW40, WSM STARTING SYSTEM Probable Cause and Reference Symptom Solution Checking Procedure Page 1. Battery is discharged or Recharge or replace battery. G-29 Starter Motor Does damaged. Not Operate 2. Slow blow fuse is blown. Replace slow blow fuse.
Page 440 ELECTRICAL SYSTEM STW34, STW37, STW40, WSM AUTOMATIC ENGINE STOP SYSTEM Probable Cause and Reference Symptom Solution Checking Procedure Page 1. Seat switch is damaged. Replace seat. 9-S26 Engine Does Not Start 2. Key stop solenoid relay is Replace key stop solenoid relay.
Page 441 ELECTRICAL SYSTEM STW34, STW37, STW40, WSM LIGHTING SYSTEM Probable Cause and Reference Symptom Solution Checking Procedure Page 1. Fuse is s blown. Replace fuse. G-38 Head Light Does Not Light 2. Bulb is blown. Replace bulb. G-39 3. Head light relay is Replace head light relay.
Page 442 ELECTRICAL SYSTEM STW34, STW37, STW40, WSM HORN Probable Cause and Reference Symptom Solution Checking Procedure Page Horn Does Not Sound 1. Combination switch is Replace combination switch. 9-S33 damaged. 2. Horn is damaged. Replace horn. – 3. Head light relay is Replace head light relay.
Page 443 ELECTRICAL SYSTEM STW34, STW37, STW40, WSM GAUGES Probable Cause and Reference Symptom Solution Checking Procedure Page 1. Fuel level sensor (tank Replace fuel level sensor. 9-S40 Fuel Gauge Does Not unit) is damaged. Function 2. Wiring harness is Repair or replace wiring harness –...
Page 444 ELECTRICAL SYSTEM STW34, STW37, STW40, WSM FAIL SAFE SYSTEM Blinking Blinking Probable Cause and Reference Indicator Solution Mode Checking Procedure Page Lamp 1. Front wheel angle sensor is damaged 2. Wiring harness of traveling Slow speed sensor is (Light up:...
Page 445 ELECTRICAL SYSTEM STW34, STW37, STW40, WSM SELF DIAGNOSIS (INSTRUMENT PANEL) Blinking Blinking Probable Cause and Reference Indicator Solution Time Checking Procedure Page Lamp 1. Signal line terminal 6-a of bi-speed controller from – – front wheel angle sensor voltage ≤ 0.2 or ≥ 4.9 V.
Page 446: Servicing Specifications
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Starter • Commutator O.D. 30.0 mm 29.0 mm 1.181 in. 1.142 in. • Mica Under Cut 0.50 to 0.80 mm 0.20 mm 0.0197 to 0.0315 in.
Page 447: Tightening Torques
ELECTRICAL SYSTEM STW34, STW37, STW40, 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" on page G-10.) Item N·m kgf·m...
Page 448: Checking, Disassembling And Servicing
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM 4. CHECKING, DISASSEMBLING AND SERVICING CAUTION • To avoid accidental short circuit, be sure to attach the positive cable to the positive terminal before the negative cable is attached to the negative terminal. • Never remove the battery cap while the engine is running.
Page 449: Main Switch (Rops Model)
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM (2) Main Switch (ROPS Model) Main Switch 1. Remove the instrument panel. 2. Disconnect the 4P connector (1) and remove the main switch. 3. Perform the following checks. (1) 4P Connector 9Y1211109ELS0007US0 Connector Voltage 1.
Page 450 ELECTRICAL SYSTEM STW34, STW37, STW40, WSM 4) Main Switch Key at START Position 1. Set and hold the main switch key at the START position. 2. Measure the resistance with an ohmmeter across the B terminal and the G terminal, across the B terminal an the ST terminal, and across the B terminal and the AC terminal.
Page 451: Main Switch (Cabin Model)
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM (3) Main Switch (CABIN Model) Connector Voltage 1. Measure the voltage across the connector B terminal and chassis. 2. If the voltage differs from the battery voltage (11 to 14 V), the wiring harness is faulty.
Page 452: Fail Safe System (Bi-Speed Turn System)
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM (4) Fail Safe System (Bi-speed Turn System) The fail safe system mentions to the operator for some trouble occurred while operating the tractor. When the fail safe system is operated, the bi-speed turn indicator lamp (1), rear PTO indicator lamp and mid PTO indicator lamp blinks and informs troubled parts.
Page 453: Fine Adjustment (Bi-Speed Turn System)
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM (5) Fine Adjustment (Bi-speed Turn System) When the front wheel turning angle sensor is replaced, the fine adjustment should be done to set the wheel angle information for the bi-speed controller. Procedure 1: Making standard setting for the fine adjustment 1.
Page 454: Self Diagnosis (Bi-Speed Turn System)
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM (6) Self Diagnosis (Bi-speed Turn System) The self-diagnosis mode is to make easier for find out the trouble point when bi-speed system has been broken down. The handling method of there systems are as follow.
Page 455: Bi-Speed Restraint Check (Bi-Speed Turn System)
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM (7) Bi-speed Restraint Check (Bi-speed Turn System) The bi-speed restraint function is designed to deactivate the bi-speed control when the machine is at a halt or running at low speed (below 0.2 km/h) or high speed (above 9.0 km/h).
Page 456: Checking By Bi-Speed Controller (Main Ecu)
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM (8) Checking by Bi-speed Controller (Main ECU) Connector [A] (6P Connector) of Wire Harness Side Color of wiring Terminal Name [A] Gr/R +5 V (Power Source for Front Wheel Angle Sensor Or/W Front Wheel Angle Sensor (Signal)
Page 457 ELECTRICAL SYSTEM STW34, STW37, STW40, WSM Bi-speed Controller Connector Voltage 1) Connector Voltage 1. Disconnect the 16P connector (1). 2. Turn the main switch to ON position. It is not necessary to run the engine. 3. Measure the voltage with voltmeter across the h terminal (4) and g terminal (3).
Page 458 ELECTRICAL SYSTEM STW34, STW37, STW40, WSM Travelling Speed Sensor 1. Disconnect the connectors (1), (2). 2. Jack up the rear wheels and shift the front wheel drive lever to OFF position. 3. Start the engine and turn the rear wheel as following condition.
Page 459 ELECTRICAL SYSTEM STW34, STW37, STW40, WSM Front Wheel Turning Angle Sensor 1. Separate the arm (4) from angle sensor lever (5). 2. Disconnect the connector (1). 3. Remove the sensor with sensor cover (3), then remove the sensor from sensor cover (3).
Page 460: Checking By Instrument Panel
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM (9) Checking by Instrument Panel Connector of Wire Harness Side Color of wiring Terminal Name – – Trailer Coupler Glow (ROPS) Glow (Cabin) Engine Oil Switch Alternator L Terminal Parking Brake Switch Turn L...
Page 461: Pto Clutch Control Switch
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM Engine Tachometer Sensor 1. Measure the resistance between terminal of panel and terminal of sensor connector. 2. If 0 ohm is not indicated, the wiring harness is faulty. Terminal 15 of panel Resistance connector – Terminal 2 of 0 Ω...
Page 462: Starter
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM (11) Starter Motor Test CAUTION • Secure the starter to prevent it from jumping up and down while testing the motor. 1. Disconnect the battery negative cable from the battery. 2. Disconnect the battery positive cable and the leads from the starter.
Page 463: Safety Switch
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM (12) Safety Switch Safety Switch Continuity 1. Remove the safety switch leads. 2. Connect the circuit tester to the safety switch leads. 3. Measure the resistance between leads. 4. If the safety switch is defective, replace it.
Page 464: Relay
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM (13) Relay Relays 1) Checking Connector Voltage 1. Open the hood. 2. Remove the relays. 3. Measure the voltage with a voltmeter across the battery terminal and chassis as table below. 4. If the voltage differs from the battery voltage, the wiring harness or fuse is faulty.
Page 465 ELECTRICAL SYSTEM STW34, STW37, STW40, WSM Grow Relay (For ROPS) 1. Turn the main switch off and remove the glow relay (1). 2. Apply battery voltage across 3 and 4 terminals, and check for continuity across 1 and 2 terminals.
Page 466: Qgs Controller For Cabin
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM Key Stop Relay 1. Turn the main switch off and remove the key stop relay (1). 2. Apply battery voltage across 3 and 4 terminals, and check for continuity across 1 and 2 terminals.
Page 467: Coolant Temperature Sensor For Cabin
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM (15) Coolant Temperature Sensor for CABIN Checking Coolant Temperature Sensor 1. Disconnect the connector from the coolant temperature sensor (1). 2. Measure the resistance with an ohmmeter across the terminal 1 (2) and terminal 2 (3) of coolant temperature sensor (1).
Page 468: Key Stop Solenoid
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM Glow Plug Continuity 1. Disconnect the leads from the glow plugs. 2. Measure the resistance with an ohmmeter between the glow plug terminal and chassis. 3. If 0 ohm is indicated, the screw at the tip of the glow plug and the housing are short-circuited.
Page 469: Alternator
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM (19) Alternator Alternator 1. Disconnect the 2P connector (3) from alternator after turning the main switch OFF. 2. Perform the following checkings. (1) Alternator (3) 2P Connector (2) B Terminal 9Y1211109ELS0050US0 Connector Voltage 1. Turn the main switch OFF. Measure the voltage between the B terminal (1) and the chassis.
Page 470: Combination Switch
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM (20) Combination Switch Remove the Combination Switch 1. Remove the instrument panel, and disconnect the combination switch 8P connector (1) after turning the main switch OFF position. 2. Perform the following checkings. (1) 8P Connector...
Page 471 ELECTRICAL SYSTEM STW34, STW37, STW40, WSM 5) Turn Signal Light Switch when Setting Switch Knob at OFF Position 1. Set the turn signal light switch to the OFF position. 2. Measure the resistance with an ohmmeter across the B2 terminal to the R terminal and the B2 terminal to the L terminal.
Page 472: Hazard Switch
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM (21) Hazard Switch Hazard Switch 1. Remove the instrument panel and disconnect the 6P connector (2) from hazard switch (1) after disconnect the battery negative code. 2. Remove the hazard switch (1). 3. Perform the following checking.
Page 473: Beacon Switch
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM (22) Beacon Switch Beacon Switch 1. Disconnect the 6P connector (2) from beacon switch (1) after disconnect the battery negative code. 2. Remove the beacon switch (1). 3. Perform the following checking. (1) Beacon Switch...
Page 474: Flasher Unit
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM (23) Flasher Unit Flasher Unit Terminal Voltage 1. Disconnect the battery negative cable, and remove the hood and side cover. 2. Disconnect the flasher unit connector (2) and connect the battery ground cable. 3. Measure the voltage with a voltmeter between 12 terminal and 7 terminal, between 13 terminal and 7 terminal.
Page 475: Brake Light Switch
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM (25) Brake Light Switch Brake Light Switch Continuity 1. Disconnect the 2P connector (1), and measure the resistance with an ohmmeter across the brake switch leads. 2. If the measurement still differs from the table, replace the brake light switch.
Page 476: Switches For Indicator Lamps
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM (26) Switches for Indicator Lamps (Rear PTO, Mid PTO, Parking Brake and Oil Pressure) PTO Switches 1. Disconnect the PTO switch 2P connector. 2. Measure the resistance of 2P connector (switch side). 3. If the measurement differs from the table, replace it.
Page 477: Gauges
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM Engine Oil Pressure Switch 1. Disconnect the lead (2) from the engine oil pressure switch after turning the main switch OFF. 2. Turn the main switch ON and connect a jumper lead from the lead to the chassis.
Page 478: Trailer Socket
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM (28) Trailer Socket Trailer Socket 1) Turning Signal Terminals 1. Turn the main switch ON, and measure the voltage with voltmeter across the 1 terminal (1) and 3 terminal (2), and across the 4 terminal (3) and 3 terminal (2).
Page 479: Disassembling And Assembling
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM [2] DISASSEMBLING AND ASSEMBLING (1) Starter Disassembling Motor 1. Disconnect the connecting lead (9) from the magnet switch (8). 2. Remove the screws (6), and then separate the end frame (4), yoke (2) and armature (1).
Page 480: Alternator
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM (2) Alternator Pulley 1. Secure the hexagonal end of the pulley shaft with a double-ended ratchet wrench as shown in the figure. 2. Loosen the pulley nut with a socket wrench and remove it.
Page 481 ELECTRICAL SYSTEM STW34, STW37, STW40, WSM Rear End Frame 1. Remove the two nuts and two screws holding the drive end frame and the rear end frame. 2. Remove the rear end frame (1). (1) Rear End Frame WSM000001ELS0028US0 Rotor 1.
Page 482: Servicing
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM [3] SERVICING (1) Starter Overrunning Clutch 1. Inspect the pinion for wear or damage. 2. If there is any problem, replace the overrunning clutch assembly. 3. Check that the pinion turns freely and smoothly in the overrunning direction and does not slip in the cranking direction.
Page 483 ELECTRICAL SYSTEM STW34, STW37, STW40, WSM Brush Holder 1. Check the continuity across the brush holder and the holder support with an ohmmeter. 2. If it conducts, replace the brush holder. Brush holder – Resistance Infinity Holder support WSM000001ELS0036US0 Armature Coil 1.
Page 484: Alternator
ELECTRICAL SYSTEM STW34, STW37, STW40, WSM (2) Alternator Bearing 1. Check the bearing for smooth rotation. 2. If it does not rotate smoothly, replace it. WSM000001ELS0039US0 Stator 1. Measure the resistance across each lead of the stator coil with an ohmmeter.
Page 485 ELECTRICAL SYSTEM STW34, STW37, STW40, WSM Rectifier 1. Check the continuity across each diode of rectifier with an analog ohmmeter. Conduct the test in the (R x 1) setting. 2. The rectifier is normal if the diode in the rectifier conducts in one direction and does not conduct in the reverse direction.
Page 486 CABIN KiSC issued 11, 2014 A...
Page 487 MECHANISM CONTENTS 1. AIR CONDITIONER SYSTEM....................10-M1 [1] OUTLINE OF AIR CONDITIONING SYSTEM..............10-M1 2. REFRIGERATION SYSTEM ....................10-M3 [1] COMPRESSOR........................10-M3 (1) Pressure Relief Valve ....................10-M4 (2) Magnetic Clutch......................10-M4 [2] CONDENSER........................10-M5 [3] RECEIVER ......................... 10-M6 [4] AIR CONDITIONER UNIT ....................10-M7 3.
Page 488: Air Conditioner System
CABIN STW34, STW37, STW40, WSM 1. AIR CONDITIONER SYSTEM [1] OUTLINE OF AIR CONDITIONING SYSTEM (1) Compressor (9) Outside Air Filter (2) Condenser (10) Side Air Outlet (3) High Pressure Pipe (11) Control Panel (4) Heater Hose (Inlet Side) (12) Front Air Outlet...
Page 489 CABIN STW34, STW37, STW40, WSM (Continued) The machine is equipped with a thin large-capacity air conditioner with outside air intake. Through the inside air filter (13) as well as the outside air filter (9), the inner roof (14) and reaches the air conditioner unit (16). The air is then cooled and dehumidified by this unit.
Page 490: Refrigeration System
CABIN STW34, STW37, STW40, WSM 2. REFRIGERATION SYSTEM [1] COMPRESSOR The vane type compressor installed on this cabin consists of a cylinder (1) with an oval cross section and a rotor (2) with five vanes (3). The vane type compressor is provided with two suction ports and two discharge ports respectively.
Page 491: Pressure Relief Valve
CABIN STW34, STW37, STW40, WSM (1) Pressure Relief Valve If the high pressure is abnormally high, the pressure relief valve (1) opens to protect the circuit. Even in the worst case, the outflow of refrigerant is stopped at the minimum limit.
Page 492: Condenser
CABIN STW34, STW37, STW40, WSM [2] CONDENSER The condenser (1) is installed in the front of the radiator to enable forced cooling by the air drawn in by the engine radiator fan. The condenser is used for the purpose of cooling by...
Page 493: Receiver
CABIN STW34, STW37, STW40, WSM [3] RECEIVER The receiver serves the purpose of storing the liquid refrigerant. The amount of liquid refrigerant flowing through the system varies with the operating condition of the air conditioner. To be accurate, the receiver stores excess refrigerant when the heat load is lowered.
Page 494: Air Conditioner Unit
CABIN STW34, STW37, STW40, WSM [4] AIR CONDITIONER UNIT The air conditioner unit consists of evaporator (2), expansion valve (3), heater core (4), blower (1) etc.. (1) Blower (3) Expansion Valve (2) Evaporator (4) Heater Core 9Y1211109CAM0009US0 A/C Blower The blower is incorporated in the left-hand space of the air conditioner unit.
Page 495: System Control
CABIN STW34, STW37, STW40, WSM 3. SYSTEM CONTROL (1) Temperature Control Dial (7) Recirculated Air (12) Air Outlet Door D3 (A) Control Plate (2) Mode Switch (8) Blower (Mode Door) (B) Air Selection Lever (3) Blow Switch (9) Evaporator (13) DEFOGGER...
Page 496: Electrical System
CABIN STW34, STW37, STW40, WSM 4. ELECTRICAL SYSTEM [1] ELECTRICAL CIRCUIT (1) Battery (9) Room Lamp (17) Blower Relay (24) Rear Washer Motor (2) Slow Blow Fuse (Main) (10) Defogger Relay (18) Blower Motor (25) Front Washer Motor (3) Slow Blow Fuse (Main Switch)
Page 497: Relay
CABIN STW34, STW37, STW40, WSM [2] RELAY Remove the outer roof and the relays are visible at the ceiling rear of the cabin: blower relay (3) and compressor relay (1). When the blower fan is adjusted for the air flow rate, the blower relay (3) is activated by a signal from the fan switch on the control panel.
Page 498 CABIN STW34, STW37, STW40, WSM Color of wiring Item Terminal No. Color of Wiring 1.25 R/W 0.5 GY Blower Relay 2.0 R/B 2.0 R 1.25 R/W 0.5 L/B Compressor Relay 1.25 Y/G 1.25 R/W 0.5 B 0.5 Y Front Wiper Relay 0.5 B...
Page 499 SERVICING CONTENTS 1. TROUBLESHOOTING.......................10-S1 2. SERVICING SPECIFICATIONS ....................10-S5 3. TIGHTENING TORQUES......................10-S6 4. PRECAUTIONS AT REPAIRING REFRIGERANT CYCLE............10-S7 [1] HANDLING OF SERVICE TOOLS ..................10-S9 (1) Manifold Gauge Set.......................10-S9 (2) Refrigerant Charging Hose..................10-S10 (3) Vacuum Pump Adaptor ....................10-S11 (4) Electric Gas Leak Tester .....................10-S11 (5) Can Tap Valve......................10-S11 (6) T-joint...........................10-S12 (7) R134a Refrigerant Recovery and Recycling Machine..........10-S12...
Page 500: Troubleshooting
CABIN STW34, STW37, STW40, WSM 1. TROUBLESHOOTING COMPRESSOR Probable Cause and Reference Symptom Solution Checking Procedure Page 1. Bearing of compressor is Replace compressor. 10-S44 Noisy worn or damaged. (Compressor ON) 2. Valves in compressor is Replace compressor. 10-S44 damaged.
Page 501 CABIN STW34, STW37, STW40, WSM Probable Cause and Reference Symptom Solution Checking Procedure Page 1. Insufficient refrigerant Check with manifold gauge. 10-S13 Insufficient Cooling (Many Bubbles in 2. Gas leaking from some Repair and charge refrigerant. – Sight Glass) place in refrigerating cycle 3.
Page 502 CABIN STW34, STW37, STW40, WSM Probable Cause and Reference Symptom Solution Checking Procedure Page 1. Low battery voltage Charge battery. G-29 Insufficient Cooling (Compressor 2. Rotor in contact with stator Replace rotor. 10-S45 Magnetic Clutch 3. Wrong wiring loose Check and repair wiring.
Page 503 CABIN STW34, STW37, STW40, WSM Probable Cause and Reference Symptom Solution Checking Procedure Page 1. Mode motor is damaged Replace mode motor assembly. 10-S28 Temperature Cannot be Controlled (Mode 2. Mode switch is damaged Replace mode switch assembly. 10-S24 Motor and / or Mode 3.
Page 504: Servicing Specifications
CABIN STW34, STW37, STW40, WSM 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Kinds of refrigerant Charge Amount R134a – 630 to 730 g 1.39 to 1.60 lbs Refrigerating Cycle Pressure 0.15 to 0.20 MPa – (Refrigerating Cycle is Normal Operating) (LO Pressure Side) 1.5 to 2.0 kgf/cm...
Page 505 CABIN STW34, STW37, STW40, 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" on page G-10.) Item N·m kgf·m lbf·ft...
Page 506: Precautions At Repairing Refrigerant Cycle
CABIN STW34, STW37, STW40, 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 507 CABIN STW34, STW37, STW40, WSM (Continued) (Refrigerant) R134a Kinds of refrigerant Factory specification 630 to 730 g (Charge amount) 1.39 to 1.60 lbs (Compressor Oil) Quantity (Total) Brand Name 110 to 120 cc ND-OIL 8 0.116 to 0.126 U.S.qts <PAG* oil>...
Page 508: Handling Of Service Tools
CABIN STW34, STW37, STW40, WSM [1] HANDLING OF SERVICE TOOLS (1) Manifold Gauge Set The hand valves on the manifold gauge set are used to open and close the valve. The hand valve inscribed LO is for the low pressure side valve (5) and HI is for the high pressure side valve (3).
Page 509: Refrigerant Charging Hose
CABIN STW34, STW37, STW40, 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 (6) is used for the LO pressure side (suction side), the green hose (5) for refrigeration side (center connecting port) and the red hose (3) for HI pressure side (discharged side).
Page 510: Vacuum Pump Adaptor
CABIN STW34, STW37, STW40, 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 511: T-Joint
CABIN STW34, STW37, STW40, WSM (6) T-joint T-joint (2) is used to increase efficiency of gas charging using two refrigerant containers (4) at a time. 1. Install two refrigerant container service valves to T-joint (2) sides and connect the charging hose (1) to it.
Page 512: Checking And Charging Refrigerant Cycle
CABIN STW34, STW37, STW40, 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 513 CABIN STW34, STW37, STW40, 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 (7 to 10 kgf/cm...
Page 514 CABIN STW34, STW37, STW40, 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)
Page 515 CABIN STW34, STW37, STW40, 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...
Page 516 CABIN STW34, STW37, STW40, 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 517: Discharging, Evacuating And Charging
CABIN STW34, STW37, STW40, WSM [2] DISCHARGING, EVACUATING AND CHARGING IMPORTANT • When discharging, evacuating or charging the refrigerating system, be sure to observe the "4. PRECAUTIONS AT REPAIRING REFRIGERANT CYCLE" on page 10-S7. 9Y1211109CAS0026US0 (1) Discharging the Refrigerant Prepare for the R134a refrigerant recovery and recycling machine.
Page 518: Evacuating The System
CABIN STW34, STW37, STW40, WSM (2) Evacuating the System 1. Discharge refrigerant from the system by R134a refrigerant recovery and recycling machine. (See page 10-S12.) 2. Connect the charging hose (red) to the HI pressure side charging valve and connect the charging hose (blue) to the LO pressure side charging valve.
Page 519: Charging The Refrigerant
CABIN STW34, STW37, STW40, 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 520 CABIN STW34, STW37, STW40, 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 set right side up, refrigerant will enter the system as a vapor.
Page 521: Checking Charge Refrigerant Amount
CABIN STW34, STW37, STW40, 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 522: Checking, Disassembling And Servicing
CABIN STW34, STW37, STW40, WSM 6. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING, DISASSEMBLING AND SERVICING (1) Compressor Operation of Magnetic Clutch 1. Turn off the A/C switch after starting the engine. 2. Check whether abrasion or abnormal noise is heard when only the magnetic clutch pulley is running.
Page 523: Control Panel (Blower Switch, A/C Switch, Mode Control Dial And Temperature Control Dial)
CABIN STW34, STW37, STW40, WSM (2) Control Panel (Blower Switch, A/C Switch, Mode Control Dial and Temperature Control Dial) Blower Switch Connector Voltage 1. Disconnect the 6P connector (2) from blower switch. 2. Turn the main switch to "ON" position.
Page 524 CABIN STW34, STW37, STW40, WSM Connector Voltage 1. Disconnect the 16P connector (2) from control panel switch. 2. Turn the main switch to "ON" position. 3. Measure the voltage with a voltmeter across the terminal o and terminal a. 4. If the voltage differs from the battery voltage, the wiring harness, A/C relay or fuse is faulty.
Page 525: Blower Resistor
CABIN STW34, STW37, STW40, WSM Temperature Control Dial Checking 1. Turn the temperature control dial counterclockwise till it stops (at "COOL" position). 2. Measure the voltage with a voltmeter across the terminal b and terminal d. Make the following measurement with the terminals connected.
Page 526: Blower Motor
CABIN STW34, STW37, STW40, 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 2P connector (2) of blower motor (1).
Page 527: Mode Motor
CABIN STW34, STW37, STW40, WSM (6) Mode Motor Mode Motor Checking 1. Make sure whether the mode switch (2) is damaged. (See page 10-S25.) 2. Turn the main switch to "ON" position. 3. Turn the blower switch at 1 position.
Page 528: Pressure Switch
CABIN STW34, STW37, STW40, WSM Functional Check NOTE • The relays described here are used same ones so that these are interchangeable. 1. Apply the battery voltage across the terminal 1 and 2, and check for continuity across the terminal 3 and 4.
Page 529: Wiper Switch
CABIN STW34, STW37, STW40, WSM (9) Wiper Switch Front and Rear Wiper Switch 1. Remove the switch cover. 2. Disconnect the wiper switch connector. 3. Perform the following checkings 1) and 2). (1) Front Wiper Switch (2) Rear Wiper Switch...
Page 530: Wiper Motor
CABIN STW34, STW37, STW40, WSM (10) Wiper Motor Front and Rear Wiper Motor 1. Raise up the wiper arm (2). 2. Turn the main switch to "ON" position. 3. Push the front wiper switch to "ON" position. 4. Count the number of wiper arm rocking per minutes.
Page 531: Disassembling And Assembling
CABIN STW34, STW37, STW40, WSM 2) Switch Continuity 1. Check the continuity across the terminals shown in the table below. 2. If the continuity specified below is not indicated, the switch is faulty. (1) Connector (Switch Side) 9Y1211109CAS0054US0 [2] DISASSEMBLING AND ASSEMBLING...
Page 532 CABIN STW34, STW37, STW40, WSM Hood, Side Cover and Battery Cord 1. To open the hood (1), hold the hood (1) and pull the release lever (3) and open the hood (1). 2. Remove the bolt from each of the side covers (2) and remove the side covers (2).
Page 533 CABIN STW34, STW37, STW40, WSM Instrument Panel and Panel Under Cover 1. Remove the screw (2). 2. Open the panel cover (1) and disconnect the electrical outlet connector (5). 3. Open the instrument panel (4) and disconnect the instrument panel connector (6). Then remove the instrument panel (4).
Page 534 CABIN STW34, STW37, STW40, WSM Wiring Harness 1. Disconnect the combination switch connector (5), main switch connector (1), hazard switch connector (4) and wiper motor connector (2). 2. Remove the panel under cover (3). 3. Remove the rubbers (6), (7).
Page 535 CABIN STW34, STW37, STW40, WSM Power Steering Hoses and Steering Support 1. Disconnect the accelerator wire (5) from the engine. 2. Disconnect the OPC controller connector (1) and CABIN joint connectors (4). 3. Remove the step cover (3). 4. Disconnect the delivery hose L.H. (6) and delivery hose R.H. (7) from the steering controller.
Page 536 CABIN STW34, STW37, STW40, WSM Seat and Lever Grip 1. Disconnect the seat switch connector (7) and remove the seat (4). 2. Remove the grips of the rear PTO shift lever (2), position control lever (1), cruise control lever (5) and range gear shift lever (6).
Page 537 CABIN STW34, STW37, STW40, WSM Auxiliary Control Valve and Covers 1. Remove the valve cover (1). 2. Remove the valve stay (4). 3. Remove the connecting rods (3). (When reassembling) • Reassemble the connecting rods (3) as shown in the figure.
Page 538 CABIN STW34, STW37, STW40, WSM Fender Assembly 1. Remove the fender cover (1). 2. Remove the sponges (4), (5). (When reassembling) • Assemble the sponge (center) (4) between the cruise control lever (2) and range gear shift lever (6). (1) Fender Cover...
Page 539 CABIN STW34, STW37, STW40, WSM Wiring Harness (Right Side) 1. Remove the loader lever guide mounting screws (1). 2. Open the loader lever guide (2) and then disconnect the connectors for PTO switch (4) and beacon switch (3). (1) Loader Lever Guide Mounting...
Page 540 CABIN STW34, STW37, STW40, WSM Wiring Harness (Rear Side) 1. Open the tool box (1). 2. Remove the clamps (2), (3) from the Cabin. 3. Disconnect the registration lamp connectors (4). 4. Disconnect the washer motor connectors (5). 5. Disconnect the PTO switch connector (6).
Page 541 CABIN STW34, STW37, STW40, WSM Clutch Pedal, Brake Pedal and Cabin Stopper Bolt 1. Remove the both sides of hose plate (5). 2. Remove the clutch pedal (3). 3. Remove the brake pedal L.H. (6) and R.H. (7) 4. Loosen the both sides of lock nut (2), and then remove the both...
Page 542 CABIN STW34, STW37, STW40, WSM Air Compressor and Oil Hoses 1. Disconnect the heater hoses (1), and then reconnect their hoses to make loop. NOTE • Put a mark to the each heater hose before disconnecting. 2. Remove the air conditioner belt (4).
Page 543: Removing Compressor Assembly
CABIN STW34, STW37, STW40, WSM (2) Removing Compressor Assembly Compressor Assembly 1. Discharge the refrigerant from the system. (See page 10-S18.) 2. Disconnect the low pressure pipe (suction) (1) and high pressure pipe (discharge) (5) from the compressor, then cap the open fitting immediately to keep moisture out of the system.
Page 544 CABIN STW34, STW37, STW40, WSM Hub Plate 1. Three stopper bolts (1) are set in stopper magnetic clutch (2) at the position corresponding to the shape of compressor. 2. The stopper magnetic clutch (2) is hung on hub plate (3) and it is fixed that the compressor rotates.
Page 545: Removing Air Conditioner Unit
CABIN STW34, STW37, STW40, WSM (3) Removing Air Conditioner Unit Draining Coolant • See page 10-S32. 9Y1211109CAS0059US0 Discharging Refrigerant • See page 10-S18. 9Y1211109CAS0060US0 Outer Roof and Stay 1. Remove the outer roof (1). 2. Remove the stay (3). 3.5 to 4.0 N·m...
Page 546 CABIN STW34, STW37, STW40, WSM Wiring Harness 1. Disconnect the temperature motor connector (3), and thermostat connectors (4). 2. Disconnect the mode motor connector (2) and blower resister (1) connector. (1) Blower Resister (3) Temperature Motor Connector (2) Mode Motor Connector...
Page 547: Removing Air Conditioner Pipes
CABIN STW34, STW37, STW40, WSM Air Conditioning Unit 1. Remove the unit cover. 2. Disconnect the heater hoses (4). 3. Remove the joint mounting screw and then disconnect the air conditioner pipes (2). 4. Remove the screws and remove the unit.
Page 548 CABIN STW34, STW37, STW40, WSM High Pressure Hose 1, 2 and Low Pressure Hose 1. Disconnect the low pressure hose (3) and high pressure hose 1 (1) from the compressor (2), then cap the open fittings immediately to keep moisture out of the system.
Page 549: Removing Heater Hoses
CABIN STW34, STW37, STW40, WSM High Pressure and Low Pressure Pipes 1. Remove the outer roof (1) and inner roof (2). 2. Remove the inner cover (3). 3. Remove the joint mounting screw and joint. 4. Disconnect the high pressure pipe 2 (5), then cap the open fitting immediately to keep moisture out of the system.
Page 550: Cabin Windshields
CABIN STW34, STW37, STW40, WSM Heater Hoses 1. Remove the outer roof (1), inner roof (2) and inner cover (3). 2. Disconnect the heater hoses (4) from the hose pipes (5). 3. Pull out the heater hoses (4) from the bottom of the cabin.
Page 551 CABIN STW34, STW37, STW40, WSM Before Replacing Windshields (1) [In case of using piano wire (When glass is clacked)] 1. Thread the piano wire from the inside of cabin. Tie its both ends to a wooden blocks or the like. (See the left figure.) 2.
Page 552 CABIN STW34, STW37, STW40, WSM Front Windshield NOTE • Apply the Sika Flex 250PC (or equivalent) with the jig having the specified tip shape as shown in the figure left. • Apply it with a uniform speed to minimize unevenness.
Page 553: Wiper Motor
CABIN STW34, STW37, STW40, WSM (7) Wiper Motor Wiper Motor 1. Remove the panel cover. 2. Disconnect the front wiper motor 4P connector. 3. Remove the wiper arm mounting nut (4) and wiper arm (1). 4. Remove the wiper link cap (5).
Page 554: Servicing
CABIN STW34, STW37, STW40, WSM [3] SERVICING Adjustment of Air Gap 1. Measure the air gap with a feeler gauge. 2. When the measurement value comes off from factory specification, adjustment shim (1) is added or deleted. 0.30 to 0.65 mm Air gap "L"...
Page 555 EDITOR : KUBOTA FARM & INDUSTRIAL MACHINERY SERVICE, LTD. 64, ISHIZU-KITAMACHI, SAKAI-KU, SAKAI-CITY, OSAKA, 590-0823, JAPAN PHONE : ( 81 ) 72-241-1129 : ( 81 ) 72-245-2484 E-mail : ks_g.ksos-pub@kubota.com Printed in Japan 2014. 11, S, EI, EI, engusa Code No.9Y111-11091 2014.

This manual is also suitable for:

Stw34 Stw40

wsm STW37 Workshop Manual

Information

General

1 Tractor Identification

2 General Precaution

3 Handling Precautions for Electrical Parts and Wiring

4 Lubricants, Fuel and Coolant

5 Tightening Torques

6 Maintenance Check List

7 Check and Maintenance

8 Special Tools

9 Tires

Servicing

Servicing

Mechanism

1 Structure

2 Power Train for Traveling System

3 Power Train for Pto System

Servicing

Servicing

1 Troubleshooting

2 Servicing Specifications

4 Disassembling and Servicing

Servicing

1 Troubleshooting

2 Servicing Specifications

4 Checking, Disassembling and Servicing

Servicing

Mechanism

Servicing

1 Troubleshooting

2 Servicing Specifications

4 Checking, Disassembling

Mechanism

1 Structure

2 Whole Hydraulic Circuit

3 Hydraulic Pump

4 Regulator Valve

5 Bi-Speed Valve

6 Point Hydraulic System

7 Hydraulic Block Type Outlet

8 Auxiliary Control Valve

Servicing

1 Troubleshooting

2 Servicing Specifications

4 Checking, Disassembling and Servicing

Mechanism

1 Wiring Diagram

2 Starting System

3 Charging System

4 Lighting System

5 Bi-Speed Turn System

6 Instrument Panel

Servicing

Mechanism

1 Air Conditioner System

2 Refrigeration System

3 System Control

4 Electrical System

Servicing

1 Troubleshooting

2 Servicing Specifications

4 Precautions at Repairing Refrigerant Cycle

5 Checking and Charging Refrigerant Cycle

6 Checking, Disassembling and Servicing

Quick Links

Chapters

Troubleshooting

Related Manuals for wsm STW37

Summary of Contents for wsm STW37