Page 1 WORKSHOP MANUAL TRACTOR STV32,STV36,STV40 KiSC issued 04, 2006 A...
Page 2 The right is reserved to make changes in all information at any time without notice. Due to covering many models of this manual, information or picture being used have not been specified as one model. August 2004 KUBOTA Corporation 2004 0000008021E KiSC issued 04, 2006 A...
Page 3 STV32 · STV36 · STV40, WSM SAFETY INSTRUCTIONS This symbol, the industry's "Safety Alert Symbol" is used throughout this manual and on labels on the machine itself to warn of the possibility of personal injury. Read these instructions carefully.It is essential that you read the instructions and safety regulations before you attempt to repair or use this unit.
Page 4 STV32 · STV36 · STV40, WSM SAFETY INSTRUCTIONS SAFETY WORKING A Do not work on the machine while under the influence of alcohol, medication, or other substances or while fatigued. A Wear close fitting clothing and safety equipment appropriate to the job. A Use tools appropriate to the work.
Page 5 STV32 · STV36 · STV40, WSM SAFETY INSTRUCTIONS VENTILATE WORK AREA A If the engine must be running to do some work, make sure the area is well ventilated. Never run the engine in a closed area. The exhaust gas contains poisonous carbon monoxide.
Page 6: Safety Decals
STV32 · STV36 · STV40, WSM SAFETY INSTRUCTIONS SAFETY DECALS The following safety decals are installed on the machine. If a decal becomes damaged, illegible or is not on the machine, replace it. The decal part number is listed in the parts list. 0000006792E KiSC issued 04, 2006 A...
Page 7 STV32 · STV36 · STV40, WSM SAFETY INSTRUCTIONS 0000006766E KiSC issued 04, 2006 A...
Page 8 STV32 · STV36 · STV40, WSM SAFETY INSTRUCTIONS 0000000762E KiSC issued 04, 2006 A...
Page 9: Specifications
Model STV32 STV36 STV40 PTO power 17.7 kW (24.1 HP)* 20.2 kW (27.5 HP)* 22.8 kW (31.0 HP) Maker KUBOTA Model D1503-M D1703-M D1803-M Type E-TVCS, water-cooled, 4-cycle diesel Number of cylinders Bore and stroke 83 x 92.4 mm (3.27 x 3.64 in.) 87 x 92.4 mm (3.43 x 3.64 in.)
Page 10 Revolution 2 speeds (540 rpm at 2670 engine rpm, 800 rpm at 2717 engine rpm) system PTO shaft U.S.A. No.5 (KUBOTA 10-tooth) involute spline Revolution 1 speed (2500 rpm at 2734 engine rpm) Note : * Manufacture's estimate. The company reserves the right to change the specifications without notice.
Page 11 STV32 · STV36 · STV40, WSM TRAVELLING SPEEDS TRAVELLING SPEEDS Model STV32, 36, 40 Tire Size (Rear) 9.5 - 22 13.6 - 16 Range gear shift lever km/h km/h 1 (Low) 0 to 6.6 0 to 6.5 2 (Middle) 0 to 12.7 0 to 12.6 Forward 3 (High)
Page 12 STV32 · STV36 · STV40, WSM DIMENSIONS DIMENSIONS 0000006808E KiSC issued 04, 2006 A...
Page 13 GENERAL KiSC issued 04, 2006 A...
Page 14: Table Of Contents
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-6 [5] HANDLING OF CIRCUIT TESTER.................G-7 4. LUBRICANTS, FUEL AND COOLANT ................G-8 5. TIGHTENING TORQUES ....................G-9 [1] GENERAL USE SCREWS, BOLTS AND NUTS ............G-9 [2] STUD BOLTS ........................G-9 6.
Page 15: Tractor Identification
STV32 · STV36 · STV40, WSM GENERAL 1. TRACTOR IDENTIFICATION When contacting your local KUBOTA distributor, always specify engine serial number, tractor serial number and hour meter reading. (1) Tractor Identification Plate (3) Engine Serial Number (2) Tractor Serial Number...
Page 16: General Precaution
A Remove oil and dirt from parts before measuring. A Use only KUBOTA genuine parts for parts replacement to maintain machine performance and to assure safety. A Gaskets and O-rings must be replaced during reassembly.
Page 17: Handling Precautions For Electrical Parts And Wiring
STV32 · STV36 · STV40, WSM GENERAL 3. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING To ensure safety and prevent damage to the machine and surrounding equipment, heed the following precautions in handling electrical parts and wiring. A Check electrical wiring for damage and loosened connection every year.
Page 18 STV32 · STV36 · STV40, WSM GENERAL A Repair or change torn or aged wiring immediately. (1) Aged (3) Insulating Vinyl Tape (2) Torn 0000002256E A Securely clamp, being careful not to damage wiring. (1) Clamp (3) Clamp *Wind Clamp Spirally (4) Welding Dent (2) Wire Harness 0000000617E...
Page 19: Battery
STV32 · STV36 · STV40, WSM GENERAL A After installing wiring, check protection of terminals and clamped condition of wiring, only connect battery. (1) Cover *Securely Install Cover 0000000620E [2] BATTERY A Take care not to confuse positive and negative terminal posts. A When removing battery cables, disconnect negative cable first.
Page 20: Connector
STV32 · STV36 · STV40, WSM GENERAL [4] CONNECTOR A For connector with lock, push lock to separate. Push 0000000623E A In separating connectors, do not pull wire harnesses. A Hold connector bodies to separate. (A) Correct (B) Incorrect 0000000624E A Use sandpaper to remove rust from terminals.
Page 21: Handling Of Circuit Tester
STV32 · STV36 · STV40, WSM GENERAL A Make certain plastic cover is large enough to cover whole connector. (1) Cover (A) Correct (B) Incorrect 0000000627E [5] HANDLING OF CIRCUIT TESTER A Use tester correctly following manual provided with tester. A Check for polarity and range.
Page 22: Lubricants, Fuel And Coolant
SAE30, 10W-30 or 10W-40 22 L Transmission case 5.81 U.S.qts. KUBOTA SUPER UDT fluid* 4.84 lmp.qts. 4.0 L KUBOTA SUPER UDT fluid or Front differential case oil 4.2 U.S.qts. SAE80, 90 gear oil 3.5 lmp.qts. Grease Place No. of greasing point...
Page 23: Tightening Torques
STV32 · STV36 · STV40, WSM GENERAL 5. TIGHTENING TORQUES [1] GENERAL USE SCREWS, BOLTS AND NUTS Screws, bolt and nuts whose tightening torque are not specified in this Workshop Manual should be tightened according to the table below. Indication on top of No-grade or 4T bolt Material of bolt...
Page 24: Maintenance Check List
STV32 · STV36 · STV40, WSM GENERAL 6. MAINTENANCE CHECK LIST Period Indication on hour meter Refer- After ence since 100 150 200 250 300 350 400 450 500 550 600 650 700 Item page every G-18, Greasing 50Hr Engine start every Check G-19...
Page 25 STV32 · STV36 · STV40, WSM GENERAL Period Indication on hour meter Refer- After ence since 100 150 200 250 300 350 400 450 500 550 600 650 700 Item page every Check G-27 200Hr Radiator hose and clamp every 2 Replace G-27 years...
Page 26: Check And Maintenance
STV32 · STV36 · STV40, WSM GENERAL 7. CHECK AND MAINTENANCE A Be sure to check and service the tractor on a flat place with engine shut off, the parking brake on and chock the wheels. 0000000633E [1] DAILY CHECK To prevent trouble from occurring, it is important to know the condition of the tractor.
Page 27: Check Points Of Initial 50 Hours
STV32 · STV36 · STV40, WSM GENERAL [2] CHECK POINTS OF INITIAL 50 HOURS Changing Engine Oil A Before changing oil, be sure to stop the engine. 1. Start and warm up the engine for approx. 5 minutes. 2. Place an oil pan underneath the engine. 3.
Page 28 Then, replenish the engine oil up to the specified level. A To prevent serious damage to the engine, replacement filter must be highly efficient. Use only a KUBOTA genuine filter or its equivalent. (1) Engine Oil Filter 0000007968E...
Page 29 STV32 · STV36 · STV40, WSM GENERAL Changing Transmission Fluid A Be sure to stop the engine when checking and changing the transmission fluid. A Allow engine to cool down sufficiently, oil can be hot and can burn. 1. Place an oil pan under the tractor. 2.
Page 30 3. After draining, screw in the two drain plugs. 4. Fill new oil from filling port with specified amount. A Use KUBOTA SUPER UDT fluid or SAE 80, 90 gear oil. Refer to "LUBRICANTS, FUEL AND COOLANT" (See page G-8.) A Oil level is at the center of the front axle.
Page 31 STV32 · STV36 · STV40, WSM GENERAL Checking Clutch Pedal Free Travel A When checking, park the tractor on flat ground, apply the parking brake, stop the engine and remove the key. 1. Slightly depress the clutch pedal (1) and measure free travel "L"...
Page 32: Check Points Of Every 50 Hours
STV32 · STV36 · STV40, WSM GENERAL [3] CHECK POINTS OF EVERY 50 HOURS Greasing (To be continued) 1. Apply a grease to the following position as figures. (1) Grease Fitting (Top Link) (4) Grease Fitting (2) Grease Fitting (Brake Pedal Shaft) (Lifting Rod RH) (5) Grease Fitting (3) Battery Terminal...
Page 33 STV32 · STV36 · STV40, WSM GENERAL Greasing (Continued) 1. Apply a grease to the following position as figures. (1) Cruise Control Lever Guide 0000007974E Checking Engine Start System A Do not allow anyone near the tractor while testing. A If the tractor does not pass the test do not operate the tractor.
Page 34: Check Points Of Every 100 Hours
STV32 · STV36 · STV40, WSM GENERAL Checking Wheel Mounting Screws and Nuts Tightening Torque A Never operate tractor with a loose rim, wheel or axle. A Any time screws and nuts are loosened, retighten to specified torque. A Check all screws and nuts frequently and keep them tight. 1.
Page 35 STV32 · STV36 · STV40, WSM GENERAL Cleaning Air Cleaner Element [Single Element and Double Element Type] 1. Remove the air cleaner cover (3) and element (primary) (1). 2. Clean the element (primary) (1) : A When dry dust adheres to the element, blow compressed air from the inside, turning the element.
Page 36 STV32 · STV36 · STV40, WSM GENERAL Cleaning Fuel Filter This job should not be done in the field, but in a clean place. 1. Close the fuel filter cock (1). 2. Unscrew the screw ring and remove the fuel filter bowl (2), and rinse the inside with kerosene.
Page 37 STV32 · STV36 · STV40, WSM GENERAL Checking Fan Belt Tension A Be sure to stop engine before checking belt tension. 1. Stop the engine and remove the key. 2. Apply moderate thumb pressure to belt between pulleys. 3. If tension is incorrect, loosen the alternator mounting bolts and using a lever placed between the alternator and the engine block, pull the alternator out until the deflection of the belt falls within acceptable limits.
Page 38 STV32 · STV36 · STV40, WSM GENERAL Checking Parking Brake A Be sure to stop engine before checking parking brake. 1. Slowly raise the parking brake lever (1) to the ratchet sound made by the parking brake lever. 2. If the No. of notch is not within the factory specifications, loosen the lock nut (2) and turn the brake rod LH (3) and RH (4) to adjust within acceptable limits.
Page 39 STV32 · STV36 · STV40, WSM GENERAL Checking Battery Condition A Do not use or charge the refillable type battery if the fluid level is below the LOWER (lower limit level) mark. Otherwise, the battery component parts may prematurely deteriorate, which may shorten the battery's service life or cause an explosion.
Page 40 STV32 · STV36 · STV40, WSM GENERAL Battery Charging A 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. A When charging battery, ensure the vent caps are securely in place (if equipped).
Page 41: Check Points Of Every 200 Hours
STV32 · STV36 · STV40, WSM GENERAL [5] CHECK POINTS OF EVERY 200 HOURS Replacing Engine Oil Filter Cartridge 1. See page G-14. 0000007988E Replacing Hydraulic Oil Filter Cartridge 1. See page G-16. 0000007989E 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 42 STV32 · STV36 · STV40, WSM GENERAL Checking HST Oil Line and Power Steering Hose 1. Check to see that all lines (1), (2) and hose clamps are tight and not damaged. 2. If hoses and clamps are found worn or damaged, replace or repair them at once.
Page 43: Check Points Of Every 400 Hours
STV32 · STV36 · STV40, WSM GENERAL 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 44: Check Points Of Every 600 Hours
STV32 · STV36 · STV40, WSM GENERAL [7] CHECK POINTS OF EVERY 600 HOURS Adjusting Front Axle Pivot 1. Loosen the lock nut (2), tighten the adjusting screw (1) all the way, and then loosen the adjusting screw (1) by 1/6 turn. 2.
Page 45 STV32 · STV36 · STV40, WSM GENERAL Flush Cooling System and Changing Coolant (To be continued) A Do not remove the radiator cap when the engine is hot. Then loosen cap slightly to the stop to relieve any excess pressure before removing cap completely.. 1.
Page 46 STV32 · STV36 · STV40, WSM GENERAL Flush Cooling System and Changing Coolant (Continued) B Anti-Freeze If it freezes, cooling water can damage the cylinders and radiator. If is necessary, if the ambient temperature falls below 0 ) to remove coolant water after operating or to add anti- freeze to it.
Page 47: Others
STV32 · STV36 · STV40, WSM GENERAL [11]OTHERS Bleeding Fuel System Air must removed : 1. When the fuel filter or lines are removed. 2. When tank is completely empty. 3. After the tractor has not been used for a long period of time. A Do not bleed the fuel system when the engine is hot.
Page 48 STV32 · STV36 · STV40, WSM GENERAL Replacing Fuse 1. The tractor electrical system is protected from potential damage by fuses. A blown fuse indicates that there is an overload or short somewhere in the electrical system. 2. If any of the fuses should blow, replace with a new one of the same capacity.
Page 49 STV32 · STV36 · STV40, WSM GENERAL Replacing Light Bulb 1. Head lights and rear combination lights. Take the bulb out of the light body and replace with a new one. 2. Other lights Detach the lens and replace the bulb. Light Capacity Head lights...
Page 50: Special Tools
STV32 · STV36 · STV40, WSM GENERAL 8. SPECIAL TOOLS [1] SPECIAL TOOLS FOR ENGINE Special Use Puller Set Code No : 07916-09032 Application : Use exclusively for pulling out bearing, gears and other parts with ease. 0000000677E Piston Ring Compressor Code No : 07909-32111 Application : Use exclusively for pushing in the piston with...
Page 51 STV32 · STV36 · STV40, WSM GENERAL Oil Pressure Tester Code No : 07916-32032 Application : Use to measure lubricating oil pressure. (1) Gauge (5) Adaptor 2 (2) Cable (6) Adaptor 3 (3) Threaded Joint (7) Adaptor 4 (4) Adaptor 1 (8) Adaptor 5 0000000681E Valve Seat Cutter...
Page 52 STV32 · STV36 · STV40, WSM GENERAL Nozzle Tester Code No : 07909-31361 Application : Use to check the fuel injection pressure and spray pattern of nozzle. Measuring : 0 to 50 MPa range (0 to 500 , 0 to 7000 psi) 0000000685E Auxiliary Socket for Fixing Crankshaft Sleeve Code No :...
Page 53 STV32 · STV36 · STV40, WSM GENERAL A The following special tools are not provided, so make them referring to the figure. 0000002319E 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 54 STV32 · STV36 · STV40, WSM GENERAL Injection Pump Pressure Tester Application : Use to check fuel tightness of injection pumps. Pressure gauge full scale : More than 29.4 MPa (300 , 4267 psi) Copper gasket Flange (Material : Steel) Hex.
Page 55 STV32 · STV36 · STV40, WSM GENERAL Bushing Replacing Tools Application : Use to press out and press fit the bushing. 1. For small end bushing 162 mm (6.38 in.) 35 mm (1.38 in.) 27 mm (1.06 in.) 35 mm dia. (1.38 in. dia.) 27.90 to 27.95 mm dia.
Page 56: Special Tools For Tractor
STV32 · STV36 · STV40, WSM GENERAL Crankshaft Bearing 1 Replacing Tool Application : Use to press out and press fit the crankshaft bearing 1. 1. Extracting tool 135 mm (5.31 in.) 72 mm (2.83 in.) R40 mm (R1.57 in.) 10 mm (0.39 in.) 20 mm (0.79 in.) 20 mm dia.
Page 57 STV32 · STV36 · STV40, WSM GENERAL Long Connector (HST Measurement Kit for B7100HST) Code No : 07916-60831 Application : Use for checking HST Charge relief pressure. 0000007960E Clutch Center Tool (for B and L Series Tractors) Application : The clutch center tool can be used for all B and L series tractors with a diaphragm clutch by changing tip guides.
Page 58 STV32 · STV36 · STV40, WSM GENERAL Adaptor 7 Code No : 07916-32951 Application : Use for checking regulating valve setting pressure. 0000008040E Relief Valve Pressure Tester Code No : 07916-50045 Application : This allows easy measurement of relief set pressure.
Page 59 STV32 · STV36 · STV40, WSM GENERAL A The following special tools are not provided, so make them referring to the figure. 0000002319E Adaptor for Flow Meter Application : Use for checking the hydraulic pump for 3P linkage. A When using, attach with following parts. O-ring : 04811-00180 2-8.5 mm dia.
Page 60 STV32 · STV36 · STV40, WSM GENERAL Piston Gasket Correcting Tool Application : Compress the power steering cylinder piston gasket to the correct side when install the cylinder rod to the cylinder tube with ease. 13.97 mm (0.55 in.) 35.052 mm (1.38 in.) 0.122 rad (7 ) 40.000 to 40.039 mm dia.
Page 61: Tires
STV32 · STV36 · STV40, WSM GENERAL 9. TIRES [1] TIRE PRESSURE A Do not attempt mount a tire. This should be down by a qualified person with the proper equipment. A Always maintain the correct tire pressure. Do not inflate tires above the recommended pressure as shown below. A Do not use tires larger than specified.
Page 62: Tread
STV32 · STV36 · STV40, WSM GENERAL [2] TREAD A Support tractor securely on stands before removing a wheel. A Never operate tractor with a loose rim, wheel or axle. A Always attach tires as shown in the figure. A If not attached as the figure, transmission parts may be damaged. A Do not use tires larger than specified.
Page 63: Rear Wheels
STV32 · STV36 · STV40, WSM GENERAL (2) Rear Wheels A When working on slopes or working with trailer, set the wheel tread as wide as practical for the job for maximum stability. Rear tread can be adjusted as shown with the standard equipped tires. To change the tread. 1.
Page 64: Tire Liquid Injection
STV32 · STV36 · STV40, WSM GENERAL [3] TIRE LIQUID INJECTION Auxiliary weights can be used to increase traction force for plowing in fields or clayey ground. Another way is to inject water or another liquid, such as a calcium chloride solution in the tires. Water must not be used in winter since it freezes at 0 ).
Page 65 STV32 · STV36 · STV40, WSM GENERAL Injection A When a calcium chloride solution is used, cool it before pouring it into the tire. A Do not fill tires with water or solution more than 75 % of full capacity (to the valve stem level). The following four ways can be used to inject water or a calcium chloride solution into tires.
Page 66: Implement Limitations
KUBOTA. Use with implements which are not sold or approved by KUBOTA and which exceed the maximum specifications listed below, or which are otherwise unfit for use with the KUBOTA Tractor may result in malfunctions or failures of the tractor, damage to other property and injury to the operator or others. [Any malfunctions or failures of the tractor resulting from use with improper implements are not covered by the warranty.]...
Page 67 ENGINE KiSC issued 04, 2006 A...
Page 68 CONTENTS 1. LUBRICATING SYSTEM ....................1-M1 2. COOLING SYSTEM ......................1-M2 3. FUEL SYSTEM.........................1-M3 KiSC issued 04, 2006 A...
Page 69 STV32 · STV36 · STV40, WSM ENGINE 1. LUBRICATING SYSTEM (1) Rocker Arm (2) Oil Pressure Switch (3) Rocker Arm Shaft (4) Valve (5) Governor Shaft (6) Idle Gear (7) Crankshaft (8) Oil Pump (9) Oil Strainer (10) Relief Valve (11) Oil Filter Cartridge (12) Push Rod (13) Tappet...
Page 70 STV32 · STV36 · STV40, WSM ENGINE 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 71 STV32 · STV36 · STV40, WSM ENGINE 3. FUEL SYSTEM (1) Fuel Overflow Pipe (5) Injection Pump Air Vent (7) Fuel Filter a : Injected Fuel Flow (2) Injection Nozzle Pipe (8) Fuel Feed Pump b : Returned Fuel Flow (3) Injection Pipe (6) Injection Pump (9) Fuel Filter Air Vent Pipe...
Page 72 CONTENTS 1. TROUBLESHOOTING....................... 1-S1 2. SERVICING SPECIFICATIONS ..................1-S4 3. TIGHTNING TORQUES ....................1-S10 4. CHECKING, DISASSEMBLING AND SERVICING ............1-S11 [1] CHECKING AND ADJUSTING ..................1-S11 (1) Engine Body ......................1-S11 (2) Lubricating System ....................1-S14 (3) Cooling System ..................... 1-S14 (4) Fuel System......................
Page 73: Troubleshooting
STV32 · STV36 · STV40, WSM ENGINE 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Engine Does Not Start A No fuel Replenish fuel A Air in the fuel system Bleed G-33 A Water in the fuel system Change fuel and repair or replace fuel system A Fuel pipe clogged...
Page 74 STV32 · STV36 · STV40, WSM ENGINE Reference Symptom Probable Cause Solution Page A Fuel filter clogged or dirty Engine Revolution Is Change G-22 Not Smooth A Air cleaner clogged Clean or replace G-21 A Fuel leak due to loose injection pipe retaining Tighten retaining nut 1-S27 A Injection pump malfunctioning...
Page 75 STV32 · STV36 · STV40, WSM ENGINE Reference Symptom Probable Cause Solution Page A Head gasket defective Water Mixed into Replace 1-S29 Lubricant Oil A Cylinder block or cylinder head flawed Replace 1-S46 A Engine oil insufficient Low Oil Pressure Replenish G-13 A Oil filter clogged...
Page 76: Servicing Specifications
STV32 · STV36 · STV40, WSM ENGINE 2. SERVICING SPECIFICATIONS ENGINE BODY Item Factory Specification Allowable Limit Cylinder Head Surface Flatness 0.05 mm / 500 mm 0.0020 in. / 19.69 in. Compression Pressure 3.53 to 4.02 MPa / 2.55 MPa / (When Cranking with Starting Motor) (rpm) (rpm)
Page 77 STV32 · STV36 · STV40, WSM ENGINE Item Factory Specification Allowable Limit Valve Timing (Intake Valve) D1503-M (Open) 0.14 rad (8 ) before T.D.C. D1503-M (Close) 0.35 rad (20 ) after B.D.C. D1703-M (Open) 0.21 rad (12 ) D1803-M before T.D.C. D1703-M (Close) 0.63 rad (36 ) D1803-M...
Page 78 STV32 · STV36 · STV40, WSM ENGINE Item Factory Specification Allowable Limit Timing Gear Crank Gear to Idle 0.0415 to 0.1122 mm 0.15 mm Gear (Backlash) 0.00163 to 0.00442 in. 0.0059 in. Idle Gear to Cam 0.0415 to 0.1154 mm 0.15 mm Gear (Backlash) 0.00163 to 0.00454 in.
Page 79 STV32 · STV36 · STV40, WSM ENGINE Item Factory Specification Allowable Limit Connecting Rod Alignment 0.05 mm 0.0020 in. Piston Pin to Small End Bushing Clearance 0.014 to 0.038 mm 0.15 mm 0.00055 to 0.00150 in. 0.0059 in. Piston Pin (O.D.) 25.002 to 25.011 mm 0.98433 to 0.98468 in.
Page 80 STV32 · STV36 · STV40, WSM ENGINE LUBRICATING SYSTEM Item Factory Specification Allowable Limit Engine Oil Pressure At Idle Speed More than 98 kPa 49 kPa 14 psi 7 psi At Rated Speed 294 to 441 kPa 245 kPa 3.0 to 4.5 42.7 to 64.0 psi 35.6 psi Engine Oil Pressure Switch...
Page 81 STV32 · STV36 · STV40, WSM ENGINE FUEL SYSTEM Item Factory Specification Allowable Limit Injection Pump Injection Timing 0.297 to 0.331 rad (17 to 19 ) before T.D.C. Injection Nozzle Injection Pressure 13.73 to 14.71 MPa 140 to 150 1991 to 2133 psi Injection Nozzle Valve Seat Valve Seat When the pressure is...
Page 82 STV32 · STV36 · STV40, WSM ENGINE 3. TIGHTNING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts : See page G-9.) Item ft-lbs Steering wheel mounting nut 48.1 to 55.9 4.9 to 5.7 35.4 to 41.2...
Page 83: Checking, Disassembling And Servicing
STV32 · STV36 · STV40, WSM ENGINE 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING (1) Engine Body Compression Pressure 1. Run the engine until it is warmed up. 2. Stop the engine and disconnect the 2P connector from the stop solenoid in order to inject fuel.
Page 84 STV32 · STV36 · STV40, WSM ENGINE 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.) 4.
Page 85 STV32 · STV36 · STV40, WSM ENGINE Valve Clearance A 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 86: Lubricating System
STV32 · STV36 · STV40, WSM ENGINE (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 87 STV32 · STV36 · STV40, WSM ENGINE Fan Belt Damage and Wear 1. Check the fan belt for damage. 2. If the fan belt is damaged, replace it. 3. Check if the fan belt is worn and sunk in the pulley groove. 4.
Page 88 STV32 · STV36 · STV40, WSM ENGINE Radiator Water Leakage 1. Pour a specified amount of water into the radiator. 2. Set a radiator tester (Code No. 07909-31551) with an adaptor (BANZAI Code No. RCT-2A-30S) and raise the water pressure to the specified pressure. 3.
Page 89: Fuel System
STV32 · STV36 · STV40, WSM ENGINE (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 (1) on the housing under the right step. 4.
Page 90 STV32 · STV36 · STV40, WSM ENGINE A Check the injection pressure and condition after confirming that there is nobody standing in the direction the fume goes. A If the fume from the nozzle directly contacts the human body, cells may be destroyed and blood poisoning may be caused.
Page 91: Preparation
STV32 · STV36 · STV40, WSM ENGINE Valve Seat Tightness 1. Set the injection nozzle to a nozzle tester. 2. Raise the fuel pressure, and keep at 12.75 MPa (130 1849 psi) for 10 seconds. 3. If any fuel leak is found, replace the nozzle piece. No fuel leak at 12.75 MPa Injection pressure...
Page 92 A After running the engine for few minutes, stop it and check the oil level again, if low, add oil prescribed level A Use only KUBOTA SUPER UDT fluid. Use of other oils may damage the transmission or hydraulic system.
Page 93 STV32 · STV36 · STV40, WSM ENGINE Steering Wheel 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. 07916-51090).
Page 94 STV32 · STV36 · STV40, WSM ENGINE Wiring Harness (Left Side) 1. Disconnect the connector from the horn (1). 2. Disconnect the connectors from the relays (2). 3. Separate the fuse box (3) from the stay. 4. Disconnect the battery positive cable from the battery terminal. 5.
Page 95 STV32 · STV36 · STV40, WSM ENGINE Power Steering Hoses and Accelerator WIre (Right Side) 1. Remove the cushion rubber (4) noting not to damage it. 2. Disconnect the accelerator wire (5) from the engine. 3. Remove the power steering delivery hose (6). A Do not lose the check valve and spring in the pump side joint.
Page 96 STV32 · STV36 · STV40, WSM ENGINE Hydraulic Pipe and Fuel Pipe (Right Side) 1. Disconnect the fuel hose (3) from the fuel filter to drain fuel. 2. Disconnect the fuel return hoses from the fuel tank. 3. Remove the retaining screws (1) and separate the 3P hydraulic delivery pipe (2) from the hydraulic pump.
Page 97 STV32 · STV36 · STV40, WSM ENGINE Separating the Engine from Clutch Housing 1. Place the disassembling stand under the clutch housing and engine oil pan. 2. Remove the engine mounting screws, bolts and nuts, and separate the engine from the clutch housing. (When reassembling) A Apply liquid gasket (Three Bond 1208D or equivalent) to joint face of the engine and clutch housing.
Page 98 STV32 · STV36 · STV40, WSM ENGINE Separating Front Axle Assembly and Outer Parts 1. Disconnect the radiator hoses (1), (5). 2. Remove the muffler (3). 3. Remove the recovery tank (6). 4. Remove the starter motor (4) and alternator (2). 5.
Page 99: Disassembling And Assembling
STV32 · STV36 · STV40, WSM ENGINE [3] DISASSEMBLING AND ASSEMBLING (1) Cylinder Head and Valves Cylinder Head Cover 1. Remove the lead (1). 2. Remove the breather hose (2). 3. Remove the head cover screws (3). 4. Remove the cylinder head cover (4). (When reassembling) A Check to see if the cylinder head cover gasket is not defective.
Page 100 STV32 · STV36 · STV40, WSM ENGINE Nozzle Holder Assembly and Glow Plug 1. Remove the overflow pipe assembly (5). 2. Remove the nozzle holder assemblies (2) using a 21 mm deep socket wrench. 3. Remove the copper gasket (3) and heat seal (4). 4.
Page 101 STV32 · STV36 · STV40, WSM ENGINE Rocker Arm and Push Rod 1. Remove the rocker arm bracket mounting bolts. 2. Detach the rocker arm assembly (1). 3. Remove the push rods (2). (When reassembling) A When putting the push rods (2) onto the tappets (3), check to see if their ends are properly engaged with the grooves.
Page 102 STV32 · STV36 · STV40, WSM ENGINE Tappets 1. Remove the tappets (1) from the crankcase. (When reassembling) A Visually check the contact between tappets and cams for proper rotation. If defect is found, replace tappets. A Before installing the tappets, apply engine oil thinly around them.
Page 103: Timing Gears, Camshaft And Fuel Camshaft
STV32 · STV36 · STV40, WSM ENGINE (2) Timing Gears, Camshaft and Fuel Camshaft Injection Pump 1. Remove the cover (3). 2. Remove the stop solenoid (1) and stop solenoid guide (5). 3. Remove the hi-idling body (2). 4. Remove the fuel injection pump assembly (4). A Before removing the injection pump assembly (4), be sure to remove the stop solenoid (1), hi-idling body (2) and stop solenoid guide (5).
Page 104 STV32 · STV36 · STV40, WSM ENGINE Governor Springs and Speed Control Plate (To be continued) A 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 105 STV32 · STV36 · STV40, WSM ENGINE Governor Springs and Speed Control Plate (Continued) 1. Set the speed control lever (1) as the figure. 2. Take out the speed control plate (2) with care not to let the large (3) and small (4) governor springs come off this plate and fall into the gear case.
Page 106 STV32 · STV36 · STV40, WSM ENGINE Governor Springs and Speed Control Plate (Continued) (When reassembling) A Hook the small spring (4) first and then the large governor spring (2) on the speed control plate (6). A Put the specific tool (1) from the injection pump side to catch the large governor spring (2).
Page 107 STV32 · STV36 · STV40, WSM ENGINE 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 (2). 3. Remove the fan drive pulley (3) with gear puller (4). 4.
Page 108 STV32 · STV36 · STV40, WSM ENGINE Gear Case 1. Remove the hour meter gear case (if equipped). 2. Remove the gear case (1). 3. Remove the O-rings (2). (When reassembling) A Apply liquid gasket (Three Bond 1215 or equivalent) to both sides of hour meter gear case gasket.
Page 109 STV32 · STV36 · STV40, WSM ENGINE Camshaft 1. Remove the camshaft set screws (2) and draw out the camshaft (1). (When reassembling) A When installing the idle gear, be sure to align the alignment marks on gears. 23.5 to 27.5 Tightening torque Camshaft set screw 2.4 to 2.8...
Page 110: Piston And Connecting Rod
STV32 · STV36 · STV40, WSM ENGINE Crank Gear 1. Draw out the crank gear (1) with a puller (2). 2. Remove the feather key. (1) Crank Gear (2) Gear Puller 0000005391E (3) Piston and Connecting Rod Oil Pan and Oil Strainer 1.
Page 111 STV32 · STV36 · STV40, WSM ENGINE Pistons (To be continued) 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 112 STV32 · STV36 · STV40, WSM ENGINE Pistons (Continued) (When reassembling) A Before inserting piston into the cylinder, apply enough engine oil to the piston. A When inserting the piston into the cylinder, face the mark on the connecting rod to the injection pump. A Do not change the combination of cylinder and piston.
Page 113 STV32 · STV36 · STV40, WSM ENGINE Piston Ring and Connecting Rod 1. Remove the piston rings (4), (5), (6) using a piston ring tool (Code No. 07909-32121). 2. Remove the piston pin (1), and separate the connecting rod (7) from the piston (2). (When reassembling) A When installing the rings, assemble the rings so that the manufacturer's mark (12) near the gap faces the top of the...
Page 114: Crankshaft
STV32 · STV36 · STV40, WSM ENGINE (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. 4.
Page 115 STV32 · STV36 · STV40, WSM ENGINE Crankshaft A Before disassembling, check the side clearance of crankshaft. Also check it during reassembling. For D1503-M, 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 116 STV32 · STV36 · STV40, WSM ENGINE 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. (When reassembling) A Clean the oil passage in the main bearing case.
Page 117: Thermostat And Water Pump
STV32 · STV36 · STV40, WSM ENGINE (5) Thermostat and Water Pump A 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. 0000006452E Thermostat Assembly 1.
Page 118: Servicing
STV32 · STV36 · STV40, WSM ENGINE [4] SERVICING (1) Cylinder Head and Valves Cylinder Head Surface Flatness 1. Clean the cylinder head surface. 2. Place a straightedge on the cylinder head's four sides (A), (B), (C) and (D) and two diagonal (E) and (F) as shown in the figure.
Page 119 STV32 · STV36 · STV40, WSM ENGINE Valve Recessing 1. Clean the cylinder head surface, valve face and valve seat. 2. Insert the valve into the valve guide. 3. Measure the valve recessing with a depth gauge. 4. If the measurement exceeds the allowable limit, replace the valve.
Page 120 STV32 · STV36 · STV40, WSM ENGINE Replacing Valve Guide (When removing) 1. Press out the used valve guide using a valve guide replacing tool. (When installing) 1. Clean a new valve guide and valve guide bore, and apply engine oil to them. 2.
Page 121 STV32 · STV36 · STV40, WSM ENGINE Correcting Valve and Valve Seat A Before correcting the valve and seat, check the valve stem and the I.D. of valve guide section, and repair them if necessary. A After correcting the valve seat, be sure to check the valve recessing.
Page 122 STV32 · STV36 · STV40, WSM ENGINE Free Length and Tilt of Valve Spring 1. Measure the free length (A) of valve spring with vernier calipers. If the measurement is less than the allowable limit, replace it. 2. Put the valve spring on a surface plate, place a square on the side of the valve spring.
Page 123 STV32 · STV36 · STV40, WSM ENGINE Push Rod Alignment 1. Place the push rod on V blocks. 2. Measure the push rod alignment. 3. If the measurement exceeds the allowable limit, replace the push rod. 0.25 mm Push rod alignment Allowable limit 0.0098 in.
Page 124: Timing Gears, Camshaft And Fuel Camshaft
STV32 · STV36 · STV40, WSM ENGINE (2) Timing Gears, Camshaft and Fuel Camshaft Timing Gear Backlash 1. Set a dial indicator (lever type) with its tip on the gear tooth. 2. Move the gear to measure the backlash, holding its mating gear.
Page 125 STV32 · STV36 · STV40, WSM ENGINE Oil Clearance between Idle Gear Shaft and Idle Gear Bushing 1. Measure the idle gear shaft O.D. with an outside micrometer. 2. Measure the idle gear bushing I.D. with an inside micrometer, and calculate the oil clearance. 3.
Page 126: Piston And Connecting Rod
STV32 · STV36 · STV40, WSM ENGINE Oil Clearance of Camshaft Journal 1. Measure the camshaft journal O.D. with an outside micrometer. 2. Measure the cylinder block bore I.D. for camshaft with a cylinder gauge, and calculate the oil clearance. 3.
Page 127 STV32 · STV36 · STV40, WSM ENGINE Replacing Connecting Rod Small End Bushing (When removing) 1. Press out the small end bushing with a connecting rod small end bushing replacing tool. (When installing) 1. Clean a new small end bushing and bore, and apply engine oil to them.
Page 128 STV32 · STV36 · STV40, WSM ENGINE Clearance between Piston Ring and Groove 1. Remove carbon from the ring grooves. 2. Measure the clearance between the ring and the groove with a feeler gauge or depth gauge. 3. If the clearance exceeds the allowable limit, replace the ring since compression leak and oil shortage result.
Page 129: Crankshaft
STV32 · STV36 · STV40, WSM ENGINE (4) Crankshaft Side Clearance of Crankshaft 1. Move the crankshaft to the flywheel side. 2. Set a dial indicator to the crankshaft. 3. Measure the end play by pulling the crankshaft toward the crank gear.
Page 130 STV32 · STV36 · STV40, WSM ENGINE Oil Clearance between Crankpin and Crankpin Bearing 1. Clean the crankpin and crankpin bearing. 2. Put a strip of plastigage (Code No. 07909-30241) on the center of the crankpin each direction as shown in the figure. 3.
Page 131 STV32 · STV36 · STV40, WSM ENGINE Oil Clearance between Crankshaft Journal and Crankshaft Bearing 1 1. Measure the O.D. of the crankshaft journal with an outside micrometer. 2. Measure the I.D. of the crankshaft bearing 1 with an inside micrometer, and calculate oil clearance.
Page 132 STV32 · STV36 · STV40, WSM ENGINE Oil Clearance between Crankshaft Journal and Crankshaft Bearing 2 1. Put a strip of plastigage 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 133: Cylinder
STV32 · STV36 · STV40, WSM ENGINE 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. 4.
Page 134: Oil Pump
STV32 · STV36 · STV40, WSM ENGINE Correcting Cylinder (Oversize +0.25 mm) 1. When the cylinder is worn beyond the allowable limit, bore and hone it to the specified dimension. 83.250 to 83.272 mm D1503-M 3.27756 to 3.27843 in. Factory Oversize cylinder I.D.
Page 135 STV32 · STV36 · STV40, WSM ENGINE Clearance between Rotor and Cover 1. Put a strip of plastigage (Code No. 07909-30241) onto the rotor face with grease. 2. Install the cover and tighten the screws. 3. Remove the cover carefully, and measure the width of the press gauge with a sheet of gauge.
Page 136 CLUTCH KiSC issued 04, 2006 A...
Page 137 CONTENTS 1. LINKAGE MECHANISM ....................2-M1 KiSC issued 04, 2006 A...
Page 138 STV32 · STV36 · STV40, WSM CLUTCH 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. The clutch is located between the engine and transmission, and is operated by stepping on the clutch pedal.
Page 139 CONTENTS 1. TROUBLESHOOTING....................... 2-S1 2. SERVICING SPECIFICATION ..................2-S2 3. TIGHTENING TORQUES ....................2-S3 4. CHECKING, DISASSEMBLING AND SERVICING ............2-S4 [1] CHECKING AND ADJUSTING ..................2-S4 [2] PREPARATION ....................... 2-S4 (1) Separating Engine from Clutch Housing ..............2-S4 [3] DISASSEMBLING AND ASSEMBLING................. 2-S5 [4] SERVICING ........................
Page 140: Troubleshooting
STV32 · STV36 · STV40, WSM CLUTCH 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page A Clutch pedal free travel excessive Clutch Drags Adjust 2-S5 A Clutch disc boss spline sticking or rusted Replace or remove 2-S6 rust A Dust on clutch disc generated from clutch disc Remove rust facing A Release fork broken...
Page 141: Servicing Specification
STV32 · STV36 · STV40, WSM CLUTCH 2. SERVICING SPECIFICATION Item Factory Specification Allowable Limit Clutch Pedal Free Travel on Clutch 20 to 30 mm Pedal 0.78 to 1.18 in. Clutch Disc Disc Surface to Rivet 0.3 mm 0.012 in. (Depth) Clutch Disc Boss to Gear Shaft Backlash...
Page 142: Tightening Torques
STV32 · STV36 · STV40, WSM CLUTCH 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts : See page G-9.) Item ft-lbs Clutch mounting screw 23.5 to 27.5 2.4 to 2.8 17.4 to 20.2...
Page 143: Checking, Disassembling And Servicing
STV32 · STV36 · STV40, WSM CLUTCH 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING Checking Clutch Pedal Free Travel A When checking, park the tractor on flat ground, apply the parking brake, stop the engine and remove the key 1.
Page 144: Disassembling And Assembling
STV32 · STV36 · STV40, WSM CLUTCH [3] DISASSEMBLING AND ASSEMBLING Clutch Assembly 1. Remove the clutch mounting screws and remove the clutch assembly (1) from the flywheel. (When reassembling) A Direct the shorter end of the clutch disc boss toward the flywheel.
Page 145: Servicing
STV32 · STV36 · STV40, WSM CLUTCH Clutch Release Fork 1. Remove the set spring (1) from clutch release fork (2) and release hub. 2. Remove the release bearing (3) with release hub (4). (When reassembling) A Set the clutch release fork (2) and release hub (4) with set spring (1) in the correct direction.
Page 146 STV32 · STV36 · STV40, WSM CLUTCH Pressure Plate Flatness 1. Place a straightedge on the pressure plate and measure clearance with a feeler gauge at several points. 2. If the clearance exceeds the allowable limit, replace it. 3. When the pressure plate is worn around its outside and its inside surface only is in contact with the straightedge, replace even if the clearance is within allowable limit.
Page 147 TRANSMISSION KiSC issued 04, 2006 A...
Page 148 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-M5 (4) Operation and Valves ....................3-M6 (5) Control Linkage .....................3-M11 (6) Cruise Control Linkage ..................3-M12 (7) Cruise Control Release System ................3-M13 [2] RANGE GEAR SHIFT SECTION................3-M13 [3] FRONT WHEEL DRIVE SECTION ................3-M15...
Page 149 STV32,STV36,STV40, WSM TRANSMISSION 1. STRUCTURE 3TGAAAC3P091A (1) HST (Hydrostatic Transmission) (2) PTO Clutch 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 Section 3-M1 KiSC issued 04, 2006 A...
Page 150: Structure
STV32 · STV36 · STV40, WSM TRANSMISSION 2. POWER TRAIN FOR TRAVELING SYSTEM [1] HYDROSTATIC TRANSMISSION (HST) (1) Structure Hydrostatic transmission is composed of variable displacement piston pump, fixed displacement piston motor, charge pump and valve system. (1) Input Shaft (11) Hose Joint (2) Neutral Valve (Reverse) (for PTO Clutch)
Page 151: Hydraulic Circuit
STV32 · STV36 · STV40, WSM TRANSMISSION (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 (7) Neutral Valve (Forward) (8) Neutral Valve (Reverse)
Page 152 STV32 · STV36 · STV40, WSM TRANSMISSION B Valve Operating Pressure Engine Ref. No. Valve Oil Temperature Valve Operating Pressure Revolution 0.3 MPa Case Relief Valve Less than 3.0 at no-load 42.7 psi Check and High 26.4 to 29.4 MPa (4), (5) Pressure Relief Valve 270 to 300...
Page 153: Pump And Motor
STV32 · STV36 · STV40, WSM TRANSMISSION (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 154: Operation And Valves
STV32 · STV36 · STV40, WSM TRANSMISSION (4) Operation and Valves B Neutral Position (1) Oil Cooler (2) Power Steering Cylinder (3) HST Pump (Variable Discharge Pump) (4) HST Oil Filter (10 ) (5) Charge Relief Valve (6) Output Shaft (7) Oil Tank (Transmission Case) (8) HST Motor (Fixed...
Page 155 STV32 · STV36 · STV40, WSM TRANSMISSION B Forward Position (1) Oil Cooler (2) Cylinder Block (Pump) (3) HST Oil Filter (10 ) (4) Check and High Pressure Relief Valve (Forward) (5) Neutral Valve (Forward) (6) Output Shaft (7) Cylinder Block (Motor) (8) Piston (Motor) (9) Fixed Swashplate (10) Input Shaft...
Page 156 STV32 · STV36 · STV40, WSM TRANSMISSION B Reverse Position (1) Oil Cooler (2) Cylinder Block (Pump) (3) HST Oil Filter (10 ) (4) Check and High Pressure Relief Valve (Reverse) (5) Neutral Valve (Reverse) (6) Output Shaft (7) Cylinder Block (Motor) (8) Piston (Motor) (9) Fixed Swashplate (10) Input Shaft...
Page 157 STV32 · STV36 · STV40, WSM TRANSMISSION B 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 a : From the Steering (2) Poppet Controller and HST Oil...
Page 158 STV32 · STV36 · STV40, WSM TRANSMISSION B Neutral Valve The neutral valves in the main oil circuit lines are open and pass the oil to the case when in neutral, and the oil pressure in their lines becomes low. And when the oil pressure in the high pressure line increases to a specified pressure, the neutral valve closes.
Page 159: Control Linkage
STV32 · STV36 · STV40, WSM TRANSMISSION (5) Control Linkage (1) Speed Control Pedal (4) HST Lever RH (7) HST Link Rod (9) Neutral Holder (2) HST Pedal Rod (5) Trunnion Wheel (8) Neutral Cam (10) Roller (3) Damper (6) HST Lever LH The speed control pedal (1) and trunnion wheel (5) of variable swashplate are linked with the HST pedal rod (2), HST lever RH (4) LH (6), HST link rod (7) and neutral cam (8).
Page 160: Cruise Control Linkage
STV32 · STV36 · STV40, WSM TRANSMISSION (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 LH 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 maintained.
Page 161: Cruise Control Release System
STV32 · STV36 · STV40, WSM TRANSMISSION (7) Cruise Control Release System (1) Brake Link 1 (4) Brake Pedal LH (7) Spring (10) HST Pedal Support (2) Brake Pedal RH (5) Lever Guide (8) Cruise Control Lever (11) Release Wire (3) Brake Link 2 (6) Release Lever Assembly...
Page 162: Range Gear Shift Section
STV32 · STV36 · STV40, WSM TRANSMISSION [2] RANGE GEAR SHIFT SECTION (1) Hypoid Pinion Shaft (2) Spline Boss (3) 22T Shifter Gear (4) Rear Counter Shaft 1 : 1st Speed 2 : 2nd Speed 3 : 3rd Speed 0000007763E KiSC issued 04, 2006 A 3-M14...
Page 163: Front Wheel Drive Section
STV32 · STV36 · STV40, WSM TRANSMISSION [3] FRONT WHEEL DRIVE SECTION (1) Hypoid Pinion Shaft (2) Front Drive Shaft 0000007764E [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 164: Related Parts And Arrangement
STV32 · STV36 · STV40, WSM TRANSMISSION (2) Related Parts and Arrangement (1) Front Wheel Turning Angle Sensor (2) Bi-speed Valve (3) Hydraulic Clutch (Bi-speed) (4) Bi-speed Controller (5) Travelling Speed Sensor 0000007768E B Bi-speed Controller This controller operates the bi-speed valve under specified condition based on the information from the front wheel turning angle sensor and travelling speed sensor.
Page 165 STV32 · STV36 · STV40, WSM TRANSMISSION B Bi-speed Valve The bi-speed solenoid valve is built in the bi-speed valve (1) and opens and shuts the oil passage to the hydraulic clutch by an electric signal from bi-speed controller. (Reference) A The PTO solenoid valve is also built in the bi-speed valve.
Page 166: Hydraulic Oil Flow
STV32 · STV36 · STV40, WSM TRANSMISSION (3) Hydraulic Oil Flow (1) Transmission Case (2) Oil Filter (3) Hydraulic Pump (Power Steering) (4) Regulator Valve (5) Pressure Reducing Valve (6) Regulating Valve (7) Bi-speed Valve (8) Hydraulic Clutch (for Bi-speed) (9) Orifice Valve (10) Solenoid Valve (for Bi-speed)
Page 167: Power Train Of Hydraulic Clutch Section
STV32 · STV36 · STV40, WSM TRANSMISSION (4) Power Train of Hydraulic Clutch Section B 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 168: Power Train For Pto System
STV32 · STV36 · STV40, WSM TRANSMISSION 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 (7) Bi-speed Valve (8) Hydraulic Clutch...
Page 169: Power Train Of Pto Clutch Section
STV32 · STV36 · STV40, WSM TRANSMISSION (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 B PTO Engaged...
Page 170: Rear Pto Gear Shift Section
STV32 · STV36 · STV40, WSM TRANSMISSION [2] REAR PTO GEAR SHIFT SECTION (1) PTO Drive Shaft H : 800 rpm (2) PTO Shaft (Engine 2717 rpm) (3) Shifter L : 540 rpm (Engine 2670 rpm) 0000007779E [3] MID PTO GEAR SHIFT SECTION (1) PTO Drive Shaft (3) Mid PTO Drive Shaft (2) Shifter...
Page 171 CONTENTS 1. TROUBLESHOOTING....................... 3-S1 2. SERVICING SPECIFICATIONS ..................3-S5 3. TIGHTENING TORQUES ....................3-S9 4. CHECKING, DISASSEMBLING AND SERVICING ............3-S10 [1] CHECKING AND ADJUSTING ..................3-S10 [2] PREPARATION ......................3-S17 (1) Separating Engine and Clutch Housing..............3-S17 (2) Separating Clutch Housing Case ................3-S23 (3) Separating HST (Hydrostatic Transmission) ............
Page 172: Troubleshooting
STV32 · STV36 · STV40, WSM TRANSMISSION 1. TROUBLESHOOTING 0000008030E KiSC issued 04, 2006 A 3-S1...
Page 173 STV32 · STV36 · STV40, WSM TRANSMISSION 0000008031E KiSC issued 04, 2006 A 3-S2...
Page 174 1. TROUBLESHOOTING CLUTCH HOUSING Reference Symptom Probable Cause Solution Page A Transmission oil insufficient Noise from Clutch Refill G-8, 15 Housing A Bearing worn Replace 3-S49 A Gear worn or broken Replace A Bi-speed clutch damaged Repair or replace 3-S34 0000008032E MID CASE SECTION Reference...
Page 175 STV32 · STV36 · STV40, WSM TRANSMISSION TRANSMISSION CASE SECTION Reference Symptom Probable Cause Solution Page A Improper backlash between hypoid pinion and Excessive or Unusual Adjust 3-S57 Noise at All Time hypoid ring gear A Improper backlash between differential pinion Adjust 3-S54 and differential side gear...
Page 176: Servicing Specifications
STV32 · STV36 · STV40, WSM TRANSMISSION 2. SERVICING SPECIFICATIONS HYDROSTATIC TRANSMISSION (HST) AND LINKAGE Item Factory Specification Allowable Limit Speed Control Pedal to Frame Clearance 5 to 10 mm (Forward) 0.20 to 0.39 in. Maximum Traveling Speed 70 to 80 % of (Reverse) forward speed Claw to Lever Guide...
Page 177 STV32 · STV36 · STV40, WSM TRANSMISSION 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 178 STV32 · STV36 · STV40, WSM TRANSMISSION 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 179 STV32 · STV36 · STV40, WSM TRANSMISSION 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 32.000 to 32.025 mm Ring Gear 1.25984 to 1.26083 in. (I.D.) Differential Side 31.925 to 31.950 mm...
Page 180 STV32 · STV36 · STV40, WSM TRANSMISSION 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts : See page G-9) Item ft-lbs Brake link retaining nut 7.8 to 9.3 0.8 to 0.95 5.8 to 6.9...
Page 181: Checking, Disassembling And Servicing
STV32 · STV36 · STV40, WSM TRANSMISSION 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.
Page 182 STV32 · STV36 · STV40, WSM TRANSMISSION HST Safety Switch 1. After adjusting the HST neutral position, be sure to adjust the HST safety switch (2). 2. Set the HST at neutral position. 3. Disconnect the connector (3) and remove the HST safety switch (2) once.
Page 183 STV32 · STV36 · STV40, WSM TRANSMISSION Adjusting Maximum Traveling Speed A Execute 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 184 STV32 · STV36 · STV40, WSM TRANSMISSION Cruise Control Linkage A Execute this adjustment after the adjustment of maximum traveling speed. 1. Engage the cruise control lever (1) to the most forward position, and measure the clearance A between the pedal (2) and the frame.
Page 185 STV32 · STV36 · STV40, WSM TRANSMISSION 1) Lever Setting Position (Cruise Control) 1. Engage the cruise control lever (1). 2. Confirm the release lever (2) touches the cruise control lever (1) by the spring (6), and the cruise control lever (1) touches the stopper (5).
Page 186 STV32 · STV36 · STV40, WSM TRANSMISSION 3) Brake Link (Cruise Control) 1. Check the following operation of the brake link (4) by operating the brake pedals. 2. The joint bolt (3) should move along the ditch and the lever (2) must not rotate when one of brake pedals is pressed.
Page 187 STV32 · STV36 · STV40, WSM TRANSMISSION Checking Charge Relief Valve 1. Start the engine to warm up the transmission oil until to reach (104 2. Remove the plug from the oil filter bracket (2). 3. Connect the long connector (Code No.: 07916-60831) and pressure gauge.
Page 188: Preparation
A After running the engine for few minutes, stop it and check the oil level again, if low, add oil prescribed level A Use only KUBOTA SUPER UDT fluid. Use of other oils may damage the transmission or hydraulic system.
Page 189 STV32 · STV36 · STV40, WSM TRANSMISSION Steering Wheel 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. 07916-51090).
Page 190 STV32 · STV36 · STV40, WSM TRANSMISSION Steering Pillar and Controller 1. Remove the accelerator wire (1) from the engine. 2. Turn over the fuel sensor cover (2), and disconnect the grounding wire (3) and 1P connector (4) from the fuel tank. 3.
Page 191 STV32 · STV36 · STV40, WSM TRANSMISSION Fuel Tank 1. Disconnect the connector from the glow lamp timer (3). 2. Pull out the clamp (1) and separate the fuse box (2) from the shutter plate (11). 3. Disconnect the overflow hoses (4) from the fuel tank. 4.
Page 192 STV32 · STV36 · STV40, WSM TRANSMISSION Seat, Seat Under Cover and Step 1. 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). 4.
Page 193 STV32 · STV36 · STV40, WSM TRANSMISSION Hydraulic Pipes and Bi-Speed Valve Connector 1. Disconnect the bi-speed valve connector (2). 2. Loosen the clamp and separate the hydraulic suction hose (3) from the hydraulic pump (4). 3. Remove the joints and disconnect the bi-speed delivery pipe (5) from the bi-speed valve (1) and hydraulic pump (4).
Page 194: Separating Clutch Housing Case
STV32 · STV36 · STV40, WSM TRANSMISSION Separating the Engine from Clutch Housing 1. Place the disassembling stand under the clutch housing and engine oil pan. 2. Remove the engine mounting screws, bolts and nuts, and separate the engine from the clutch housing. (When reassembling) A Apply liquid gasket (Three Bond 1208D or equivalent) to joint face of the engine and clutch housing.
Page 195 STV32 · STV36 · STV40, WSM TRANSMISSION Auxiliary Control Valve 1. Remove the valve cover (8). 2. Remove the valve stay (3). 3. Remove the connecting rods (2). (When reassembling) A Reassemble the connecting rods (2) as shown in the figure. A 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 196 STV32 · STV36 · STV40, WSM TRANSMISSION ROPS 1. Fold the ROPS and support it with the lift strap. 2. Disconnect the wiring connector for the lights on the ROPS. 3. Remove the ROPS mounting bolts and nuts (1). 4. Pull out the ROPS. 197 to 225 ROPS mounting bolt Tightening torque...
Page 197 STV32 · STV36 · STV40, WSM TRANSMISSION Fender Assembly 1. Remove the lever bracket (2) with the auxiliary control lever. 2. Remove the fender covers (3) (4) and the sponges (9) (10) (11). 3. Disconnect the wiring connectors for the rear PTO switch (19), mid PTO switch (17) and speed sensor (18).
Page 198 STV32 · STV36 · STV40, WSM TRANSMISSION Rear Frame and Under Frame 1. Remove the rear cross bar (2). 2. Remove the rubber mount screw (9) and rear frame mounting screw (5) then detach the rear frame (4). 3. Remove the rubber mount screw (8) and remove the rear bracket (6) (7).
Page 199 STV32 · STV36 · STV40, WSM TRANSMISSION 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 200 STV32 · STV36 · STV40, WSM TRANSMISSION HST Linkage 1. Remove the return spring (1). 2. Remove the neutral holder (7) and holder shaft (8). 3. Remove the neutral cam (2) and HST link rod (6). 4. Remove the HST pedal rod (3). 5.
Page 201 STV32 · STV36 · STV40, WSM TRANSMISSION Hydraulic Pipe and HST Filter Bracket 1. Remove the charge hose (4) and PTO delivery hose (5). 2. Remove the charge pipe (3). 3. Remove the filter bracket (2) with the filter (1). 4.
Page 202: Separating Hst (Hydrostatic Transmission)
STV32 · STV36 · STV40, WSM TRANSMISSION (3) Separating HST (Hydrostatic Transmission) Separating HST (Hydrostatic Transmission) 1. Place a disassembly stand under the HST (2) and mid case (1). 2. Remove the HST mounting screw and nuts to separate the HST (2) from the mid case (1).
Page 203 STV32 · STV36 · STV40, WSM TRANSMISSION Hydraulic Cylinder 1. Remove the front drive rod (1), range gear shift rod (2) and mid PTO rod (4). 2. Remove external snap ring and remove the brake lever (14) (12). 3. Remove the stay mounting screws (3). 4.
Page 204 STV32 · STV36 · STV40, WSM TRANSMISSION 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 205: Disassembling And Assembling
STV32 · STV36 · STV40, WSM TRANSMISSION [3] DISASSEMBLING AND ASSEMBLING (1) Clutch Housing Case 18T Gear Shaft 1. Take out the bi-speed turn hydraulic clutch assembly (1) with 18T gear shaft (2) from the clutch housing case. (When reassembling) A Apply grease to the oil seal (3) of the clutch housing.
Page 206 STV32 · STV36 · STV40, WSM TRANSMISSION Disassembling Bi-speed Turn Hydraulic Clutch 1. Remove the internal snap ring (2), then take out 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 take out the collar (6) and spring (7).
Page 207: Hydrostatic Transmission (Hst)
STV32 · STV36 · STV40, WSM TRANSMISSION (2) Hydrostatic Transmission (HST) (1) Case (5) Output Shaft (9) Case Relief Valve (13) Port Block (2) Trunnion Shaft (6) Fixed Displacement (10) Valve Plate (Pump) (14) Check and High Pressure (3) Variable Displacement Piston Motor (11) Valve Plate (Motor) Relief Valve (Forward)
Page 208 STV32 · STV36 · STV40, WSM TRANSMISSION Accumulator (for PTO Clutch) 1. Remove the internal snap ring and pull out the accumulator assembly (1). (When reassembling) A Apply transmission oil to the O-ring (4) (9) and the seal (8). (1) Accumulator Assembly (7) Piston (2) Internal Snap Ring (8) Seal...
Page 209 STV32 · STV36 · STV40, WSM TRANSMISSION Check and High-Pressure Relief Valve 1. Take out the check spring (4) and the relief valve assembly (3) after removing the plug (5). (When reassembling) A Apply transmission oil to the O-rings and relief valve assembly (3).
Page 210 STV32 · STV36 · STV40, WSM TRANSMISSION Cylinder Block 1. Pull out the cylinder block (2) with piston (1) as a unit. A Make alignment mark on the piston and cylinder when removing the piston from cylinder block. (When reassembling) A Apply transmission oil to the thrust plate (3) and pistons.
Page 211: Mid Case
STV32 · STV36 · STV40, WSM TRANSMISSION (3) Mid Case Removing Hydraulic PTO Clutch 1. Remove the magnet (3) and inlet pipe (2). 2. Remove the external snap rings (4) (6) and collar (5) on the 24T gear shaft (7). 3.
Page 212 STV32 · STV36 · STV40, WSM TRANSMISSION Hydraulic PTO Clutch (To be Continued) 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.
Page 213 STV32 · STV36 · STV40, WSM TRANSMISSION Hydraulic PTO Clutch (Continued) 1. Remove the internal snap ring (18) and take out the pressure plate (15), steel plate (17) and clutch disc (16). 2. Hydraulic clutch pack can be disassembled as shown in figure. (When reassembling) A Apply transmission oil to the clutch disc (5) (16).
Page 214: Transmission Case
STV32 · STV36 · STV40, WSM TRANSMISSION (4) Transmission Case Front Drive Shaft and Mid Cover 1. Remove the joint shaft (3) and coupling. 2. Remove the front drive shaft (4) and 24T gear (1). 3. Remove the mid cover mounting screws and take out the hypoid pinion assembly (5), counter shaft assembly (9), mid cover (2) and shift fork (8) at the same time.
Page 215 STV32 · STV36 · STV40, WSM TRANSMISSION 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 take out it. 3.
Page 216 STV32 · STV36 · STV40, WSM TRANSMISSION 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.
Page 217 STV32 · STV36 · STV40, WSM TRANSMISSION Rear PTO Case 1. Pull out the PTO drive shaft (3) and mid PTO 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 218 STV32 · STV36 · STV40, WSM TRANSMISSION 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 219 STV32 · STV36 · STV40, WSM TRANSMISSION Differential Gear Assembly 1. Remove the differential bearing holder (1), noting the number of shims L (4). 2. Take out the differential gear as an assembly and the shims R (3). (When reassembling) A Install same number of shims as before disassembling.
Page 220: Servicing
STV32 · STV36 · STV40, WSM TRANSMISSION Differential Pinion Shaft, Differential Pinion and Differential Side Gear 1. Take out the differential side gear (3) and shim (2). 2. Tap out the dowel pin (6). 3. Pull out the differential pinion shaft (7), then take out the differential pinions (5), thrust collars (4), differential side gear (10) and shim (9).
Page 221 STV32 · STV36 · STV40, WSM TRANSMISSION Steel Plate and Pressure Plate Wear 1. Measure the steel plate thickness with vernier calipers. 2. Measure the pressure plate thickness with vernier calipers. 3. If the thickness is less than the allowable limit, replace. 0.95 to 1.05 mm Factory spec.
Page 222: Hydraulic Pto Clutch And Gears
STV32 · STV36 · STV40, WSM TRANSMISSION Clearance between Counter Shaft B and 32T Gear 1. Measure the counter shaft B O.D. with an outside micrometer. 2. Measure the 32T gear I.D. with an inside micrometer, and calculate the clearance. 3.
Page 223 STV32 · STV36 · STV40, WSM TRANSMISSION Steel Plate and Pressure Plate Wear 1. Measure the steel plate thickness with vernier calipers. 2. Measure the pressure plate thickness with vernier calipers. 3. If the thickness is less than the allowable limit, replace. 0.95 to 1.05 mm Factory spec.
Page 224: Transmission Case
STV32 · STV36 · STV40, WSM TRANSMISSION 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.
Page 225 STV32 · STV36 · STV40, WSM TRANSMISSION 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 Factory spec.
Page 226 STV32 · STV36 · STV40, WSM TRANSMISSION 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 227 STV32 · STV36 · STV40, WSM TRANSMISSION 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 228 STV32 · STV36 · STV40, WSM TRANSMISSION Backlash and Tooth Contact between Hypoid Pinion and Hypoid Ring Gear 1. Set a dial gauge with its finger on the tooth surface of hypoid ring gear. 2. Measure the backlash by fixing the hypoid pinion and moving hypoid ring gear by hand.
Page 229 STV32 · STV36 · STV40, WSM TRANSMISSION Correcting of Tooth Contact 1. Proper contact. A No adjustment. 0000007740E 2. Correcting of the heel contact and shallow contact. A Change the differential bearing holder collar (5) to thick it. A Change the bearing holder shim (1) to thick it. A Repeat above until the proper tooth contact and backlash are achieved.
Page 230 STV32 · STV36 · STV40, WSM TRANSMISSION Clearance between Mid-PTO Drive Shaft to 15T Gear 1. Measure the 15T gear I.D. (1) and mid-PTO drive shaft O.D. (2). 2. Calculate the clearance. 3. If the clearance exceeds the allowable limit, replace. 0.040 to 0.074 mm Factory spec.
Page 231: Rear Axle
REAR AXLE KiSC issued 04, 2006 A...
Page 232 CONTENTS 1. STRUCTURE........................4-M1 2. FINAL REDUCTION SYSTEM ..................4-M2 KiSC issued 04, 2006 A...
Page 233 STV32 · STV36 · STV40, WSM REAR AXLE 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 (7) Planetary (11) Differential Bearing Holder (15) Steel Plate...
Page 234 STV32 · STV36 · STV40, WSM REAR AXLE 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 235 CONTENTS 1. TROUBLESHOOTING....................... 4-S1 2. SERVICING SPECIFICATIONS ..................4-S2 3. TIGHTENING TORQUES ....................4-S3 4. DISASSEMBLING AND SERVICING ................4-S4 [1] DISASSEMBLING AND ASSEMBLING................. 4-S4 [2] SERVICING ........................4-S6 KiSC issued 04, 2006 A...
Page 236: Troubleshooting
STV32 · STV36 · STV40, WSM REAR AXLE 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page A Improper backlash between internal gear and Excessive or Unusual Replace 4-S6 Noise at All Time planetary gear A Bearing worn Replace 4-S4 A Insufficient or improper type of transmission Replenish or change G-8, 15 fluid used...
Page 237: Servicing Specifications
STV32 · STV36 · STV40, WSM REAR AXLE 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 238: Tightening Torques
STV32 · STV36 · STV40, WSM REAR AXLE 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts : See page G-9.) Item ft-lbs Stopper mounting screw 48.1 to 55.9 4.9 to 5.7 35.4 to 41.2...
Page 239: Disassembling And Servicing
STV32 · STV36 · STV40, WSM REAR AXLE 4. DISASSEMBLING AND SERVICING [1] DISASSEMBLING AND ASSEMBLING Separating Rear Axle Refer to "PREPARATION" section of 3. TRANSMISSION (3- S33). 0000007600E Planetary Gear 1. Take out the stopper (4), then remove the screw and washer (1).
Page 240 STV32 · STV36 · STV40, WSM REAR AXLE Rear Axle 1. Tap out the rear axle. (When reassembling) A Apply grease to the oil seal. A Do not allow any gap (A) between the inner and outer surfaces of the oil seal (1). (Refer to figure left) (1) Oil Seal A: Gap (2) Rear Axle...
Page 241: Servicing
STV32 · STV36 · STV40, WSM REAR AXLE [2] SERVICING Backlash between Internal Gear and Planetary Gear 1. Set a dial indicator (lever type) on the tooth of the planetary gear. 2. Hold the planetary carrier and move the planetary gear to measure the backlash.
Page 242 BRAKES KiSC issued 04, 2006 A...
Page 243 CONTENTS 1. BRAKE LINKAGE ......................5-M1 2. OPERATION........................5-M2 KiSC issued 04, 2006 A...
Page 244 STV32 · STV36 · STV40, WSM BRAKES 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 245 STV32 · STV36 · STV40, WSM BRAKES 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 B During Braking When the brake pedal is pressed, the linkage causes the brake lever (1) and brake cam (2) to turn into the direction of arrow shown in the above diagram.
Page 246 CONTENTS 1. TROUBLESHOOTING....................... 5-S1 2. SERVICING SPECIFICATIONS ..................5-S2 3. CHECKING, DISASSEMBLING AND SERVICING ............5-S3 [1] CHECKING AND ADJUSTING ..................5-S3 [2] DISASSEMBLING AND ASSEMBLING................. 5-S4 [3] SERVICING ........................5-S5 KiSC issued 04, 2006 A...
Page 247: Troubleshooting
STV32 · STV36 · STV40, WSM BRAKES 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page Uneven Braking Force A Brake pedal free travel unevenly adjusted Adjust 5-S3 A Brake disc worn Replace 5-S6 A Cam plate warped Replace 5-S6 A Brake pedal free travel too small Brake Drags Adjust 5-S3...
Page 248: Servicing Specifications
STV32 · STV36 · STV40, WSM BRAKES 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Brake Pedal Free Travel 20 to 30 mm 0.79 to 1.18 in. Difference of Stroke Less than 5 mm (RH and LH) 0.19 in. Parking Brake Lever Free Travel The brake works when the lever is raised until...
Page 249: Checking, Disassembling And Servicing
STV32 · STV36 · STV40, WSM BRAKES 3. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING Brake Pedal Free Travel A Stop the engine and chock the wheels before checking brake pedal. A The difference between the right and left pedal plays must be less than 5.0 mm (0.19 in.).
Page 250: Disassembling And Assembling
STV32 · STV36 · STV40, WSM BRAKES Parking Brake Lever Free Travel 1. Support the rear axle with the disassembling stand to separate the rear wheels from the ground. 2. Shift the range gear shift lever to the neutral position, and disengage the front wheel drive lever.
Page 251: Servicing
STV32 · STV36 · STV40, WSM BRAKES Brake Disc, Brake Plate and Brake Cam 1. Remove the brake disc (5), brake shaft (3), brake plate 1 (1) and brake disc 2 (2). 2. Remove the cam plate (8) and steel balls (6). 3.
Page 252 STV32 · STV36 · STV40, WSM BRAKES Cam Plate Flatness 1. Place the cam plate on the surface plate. 2. Use a feeler gauge of 0.3 mm (0.012 in.) thick for judgement of the cam plate flatness. Measure the flatness diagonally at more than four locations.
Page 253: Front Axle
FRONT AXLE KiSC issued 04, 2006 A...
Page 254 CONTENTS 1. STRUCTURE........................6-M1 KiSC issued 04, 2006 A...
Page 255 STV32 · STV36 · STV40, WSM FRONT AXLE 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 (8) Front Axle Bracket, (Front) (13) Differential Case...
Page 256 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 ........................
Page 257: Troubleshooting
STV32 · STV36 · STV40, WSM FRONT AXLE 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page A Tire pressure uneven Front Wheels Wander Adjust G-47 to Right or Left A Improper toe-in adjustment Adjust 6-S4 A Excessive clearance between front axle case Replace 6-S14 boss and bracket bushing...
Page 258: Servicing Specifications
STV32 · STV36 · STV40, WSM FRONT AXLE 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Front Wheel Alignment Toe-in 2.0 to 8.0 mm 0.078 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 lbs Front Axle Case Bosses to Bracket Clearance...
Page 259 STV32 · STV36 · STV40, WSM FRONT AXLE 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts : See page G-9) Item ft-lbs Front wheel mounting screws and nuts 77.5 to 90.2 7.9 to 9.2 57.1 to 66.5...
Page 260: Checking, Disassembling And Servicing
STV32 · STV36 · STV40, WSM FRONT AXLE 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 261: Disassembling And Assembling
STV32 · STV36 · STV40, WSM FRONT AXLE Front Axle Rocking Force 1. Jack up the front side of tractor. 2. Remove the front wheels. 3. Set a spring balance to the front wheel mounting stud bolt with nut. 4. Measure the front axle rocking force. 5.
Page 262 STV32 · STV36 · STV40, WSM FRONT AXLE Front Wheel Turning Angle Sensor 1. Remove the wire harness clamp (2). 2. Disconnect the connector (1). 3. Remove the cotter pin and disconnect the arm (4) from the sensor lever (3). A Route the wire harness under the both power steering hoses.
Page 263: Disassembling Front Axle Assembly
STV32 · STV36 · STV40, WSM FRONT AXLE (2) Disassembling Front Axle Assembly Steering Cylinder, Axle Bracket and Front Wheel Turning Angle Sensor 1. Remove the slotted nut and remove the both RH and LH tie- rod (6). 2. Remove the front axle brackets (3), (7). 3.
Page 264 STV32 · STV36 · STV40, WSM FRONT AXLE 0000007629E 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).
Page 265 STV32 · STV36 · STV40, WSM FRONT AXLE Separating Gear Case 1. Remove the internal snap ring (7). 2. Take out the shim (6), 11T bevel gear (4) and 16T bevel gear (3) from bevel gear case (5). 3. Remove the external snap ring (2) from bevel gear case (5). 4.
Page 266: Servicing
STV32 · STV36 · STV40, WSM FRONT AXLE 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.
Page 267 STV32 · STV36 · STV40, WSM FRONT AXLE Clearance between Differential Pinion Shaft and Differential Pinion 1. Measure the pinion shaft O.D.. 2. Measure the differential pinion I.D. and calculate the clearance. 3. If the clearance exceeds the allowable limit, replace faulty parts.
Page 268 STV32 · STV36 · STV40, WSM FRONT AXLE Turning Force of Spiral Bevel Pinion Shaft (Pinion Shaft Only) 1. Clamp the spiral bevel pinion shaft assembly to the vise and tighten the staking nut. 2. Measure the turning torque of bevel pinion shaft. 3.
Page 269 STV32 · STV36 · STV40, WSM FRONT AXLE A 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 0000007640E A Shallow or Heel Contact Replace the adjusting collars (3), (4) to move the bevel pinion...
Page 270 STV32 · STV36 · STV40, WSM FRONT AXLE 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. 3.
Page 271 STEERING KiSC issued 04, 2006 A...
Page 272 CONTENTS 1. STRUCTURE........................7-M1 2. HYDRAULIC CIRCUIT FOR POWER STEERING ............7-M2 3. STEERING CYLINDER ....................7-M3 KiSC issued 04, 2006 A...
Page 273 STV32 · STV36 · STV40, WSM STEERING 1. STRUCTURE (1) Hydraulic Pump (3) Steering Controller (5) Filter Bracket (7) Steering Cylinder (2) Regulating Valve (4) HST Oil Filter (6) HST (Hydrostatic (8) Steering Wheel Transmission) A: To Oil Cooler This tractor is equipped with a full hydrostatic power steering. The steering controller (3) is connected to the steering cylinder (7) with the hydraulic pipe only, therefore it is simple in construction.
Page 274 STV32 · STV36 · STV40, WSM STEERING 2. HYDRAULIC CIRCUIT FOR POWER STEERING The oil from the hydraulic pump (9) passes through the regulating valve (4) and enters the steering controller (2). Return oil from the controller (2) enters into the HST (hydrostatic transmission) through the HST oil filter as charging oil.
Page 275 STV32 · STV36 · STV40, WSM STEERING 3. STEERING CYLINDER (1) Rod Assembly (4) O-ring (6) Internal Snap Ring (8) Rod Gasket (2) Packing (5) Cover (7) Dust Seal (9) Bushing (3) Cylinder Tube 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 276 CONTENTS 1. TROUBLESHOOTING....................... 7-S1 2. SERVICING SPECIFICATIONS ..................7-S2 3. TIGHTENING TORQUES ....................7-S3 4. CHECKING, DISASSEMBLING AND SERVICING ............7-S4 [1] CHECKING AND ADJUSTING ..................7-S4 [2] DISASSEMBLING AND ASSEMBLING................. 7-S4 (1) Steering Controller....................7-S4 KiSC issued 04, 2006 A...
Page 277: Troubleshooting
STV32 · STV36 · STV40, WSM STEERING 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page A Steering controller broken Tractor Cannot Be Replace 7-S5 Steered A Hose broken Replace A Centering spring weaken or broken Front Wheels Vibrate Replace steering 7-S5 controller A Improper toe-in adjustment...
Page 278: Servicing Specifications
STV32 · STV36 · STV40, WSM STEERING 2. SERVICING SPECIFICATIONS STEERING WHEEL Item Factory Specification Allowable Limit Steering Wheel Operating Torque 1.0 to 2.0 0.10 to 0.20 0.72 to 1.45 ft-lbs 0000007793E KiSC issued 04, 2006 A 7-S2...
Page 279 STV32 · STV36 · STV40, WSM STEERING 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts : See page G-9.) Item ft-lbs Delivery hose RH retaining nut 24.5 to 29.4 2.5 to 3.0 18.1 to 21.7...
Page 280: Checking, Disassembling And Servicing
STV32 · STV36 · STV40, WSM STEERING 4. CHECKING, DISASSEMBLING AND SERVICING [1] CHECKING AND ADJUSTING A Refer to the "8. HYDRAULIC SYSTEM" for hydraulic pump and steering controller. A Use only the transmission fluid (see page G-8), in no case mixture of oils of different brands. A Do not disassemble the hydraulic pump and steering controller needlessly.
Page 281 STV32 · STV36 · STV40, WSM STEERING Removing Steering Controller 1. Disconnect the delivery hose (5), delivery hose LH (3), delivery hose RH (2) and charge hose (4). 2. Remove the mounting screws (1) and separate the steering controller (6). (When reassembling) A Apply transmission oil to the oil seal (12).
Page 282 STV32 · STV36 · STV40, WSM STEERING Hose Joint 1. Remove the hose joints (1), (2), (3), (4). (When reassembling) A Apply seal tape on to the hose joints. 34.3 to 49.0 Hose joint 3.5 to 5.0 (RT, LT, IN port) 25.3 to 36.2 ft-lbs Tightening torque 24.5 to 34.3...
Page 283: Hydraulic System
HYDRAULIC SYSTEM KiSC issued 04, 2006 A...
Page 284 CONTENTS 1. STRUCTURE........................8-M1 2. WHOLE HYDRAULIC CIRCUIT ..................8-M2 3. HYDRAULIC PUMP......................8-M4 4. REGULATOR VALVE .......................8-M5 5. BI-SPEED VALVE ......................8-M7 [1] HYDRAULIC CIRCUIT....................8-M7 [2] OIL FLOW........................8-M8 6. THREE POINT HYDRAULIC SYSTEM ................8-M9 [1] HYDRAULIC CIRCUIT....................8-M9 [2] POSITION CONTROL VALVE..................8-M10 [3] FEEDBACK LINKAGE ....................8-M10 [4] RELIEF VALVE......................8-M13 [5] HYDRAULIC CYLINDER ....................8-M14 7.
Page 285: Structure
STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM 1. STRUCTURE (1) Auxiliary Control Valve (5) Power Steering Hydraulic (8) Oil Cooler (11) Bi-speed Valve (2) Hydraulic Cylinder Pump (9) Steering Cylinder (12) HST Oil Filter (3) Hydrostatic Transmission (6) Regulator Valve (10) Hydraulic Block Type (13) Oil Filter (HST)
Page 286: Whole Hydraulic Circuit
STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM 2. WHOLE HYDRAULIC CIRCUIT (1) Transmission case (4) Engine (7) Auxiliary Control Valve (9) Hydraulic Cylinder (2) Oil Filter (5) Hydraulic Block Type (8) Lowering Speed Adjusting (10) Position Control Valve (3) Hydraulic Pump Outlet Valve (3P System)
Page 287 STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM (11) Hydraulic Pump (14) Steering Controller (17) Oil Cooler (20) Accumulator (Power Steering) (15) HST Oil Filter (18) Hydraulic Clutch (Bi-speed) (21) Bi-speed Valve (12) Regulator Valve (16) Hydrostatic Transmission (19) Hydraulic Clutch (PTO) (13) Steering Cylinder (HST) b : Continue to Last Page...
Page 288: Hydraulic Pump
STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM 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 is composed of two pairs of gears, side plates, bushing and other components as shown in the figure.
Page 289: Regulator Valve
STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM 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 : A Port (2) 3P Hydraulic Pump B : B Port (3) Power Steering Pump...
Page 290 STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM B 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 maintain the inlet pressure of the pressure reducing valve (5) to 30 except when the power steering is operated.
Page 291: Bi-Speed Valve
STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM 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 bi- speed valve (1), and they operate respectively according to the electrical signal from the PTO switch and the bi-speed controller.
Page 292: Oil Flow
STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM [2] OIL FLOW (1) Regulator Valve (2) Bi-speed Valve (3) PTO Hydraulic Clutch (4) Accumulator (5) Filter (6) Bi-speed Hydraulic Clutch (7) Orifice Valve (8) Solenoid Valve (Bi-speed) (9) Solenoid Valve (PTO) A : A Port (To Bi-speed Hydraulic Clutch) B : B Port (To PTO...
Page 293: Three Point Hydraulic System
STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM 6. THREE POINT HYDRAULIC SYSTEM [1] HYDRAULIC CIRCUIT (1) Auxiliary Control Valve (5) Position Control Valve (9) Engine a : To Hydraulic Pump (2) Hydraulic Cylinder (6) Oil Tank (Transmission (10) Hydraulic Block Type (Power Steering) (3) Lowering Speed Adjusting Case)
Page 294: Position Control Valve
STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM [2] POSITION CONTROL VALVE The control valve is composed as shown figure left. The spool (3) is moved by operating the position control lever. The positions of the spool movement makes four kinds of circuit such as "Neutral", "Lifting", "Lowering"...
Page 295 STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM B 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 296 STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM B Lowering 4. 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 297: Relief Valve
STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM [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 pressure and capacity, and constructed so as to prevent chattering and other unstableness associated with direct acting relief valves.
Page 298: Hydraulic Cylinder
STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM [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 (To Auxiliary (2) Cylinder Head (7) Back-up Ring (12) Spool Drive Lever Control Valve)
Page 299: Hydraulic Block Type Outlet
STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM 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 300: Auxiliary Control Valve
STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM 8. AUXILIARY CONTROL VALVE [1] HYDRAULIC CIRCUIT 0000007840E KiSC issued 04, 2006 A 8-M16...
Page 301 STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM 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 302 CONTENTS 1. TROUBLESHOOTING....................... 8-S1 2. SERVICING SPECIFICATIONS ..................8-S2 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 (3P Hydraulic System) ..............8-S8 (3) Regulator Valve .....................
Page 303: Troubleshooting
STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page A Control linkage improperly adjusted Implement Does Not Adjust 8-S13 Rises (Not Noise) A Control linkage improperly assembled or Repair or replace 8-M10 damaged A Position control valve malfunctioning Repair or replace 8-S20, 21...
Page 304: Servicing Specifications
STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM 2. SERVICING SPECIFICATIONS HYDRAULIC PUMP Item Factory Specification Allowable Limit Hydraulic Pump (Power Steering) Delivery at No 14.0 L/min. Pressure 3.70 U.S.gals./min. 3.08 Imp.gals./min. Delivery at Rated 13.72 L/min. 12.25 L/min. Pressure 3.62 U.S.gals./min.
Page 305 STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM 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 0.0047 to 0.0083 in.
Page 306 STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM STEERING CYLINDER Item Factory Specification Allowable Limit Cylinder Tube I.D. 40.000 to 40.039 mm 40.100 mm 1.5748 to 1.5763 in. 1.5787 in. Rod to Cylinder Cover Bushing Clearance 0.097 to 0.173 mm 0.2 mm 0.00381 to 0.00681 in.
Page 307 STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts : See page G-9.) Item ft-lbs Joint screw (Power steering delivery hose) 49.0 to 58.8 5.0 to 6.0 36.2 to 43.4...
Page 308: Checking, Disassembling And Servicing
[1] CHECKING AND ADJUSTING (1) Hydraulic Pump (Power Steering) Flowmeter Connecting and Test Preparation A When using a flowmeter other than KUBOTA specified flowmeter (Code No.: 07916-52792), be sure to use the instructions with that flowmeter. A The flowmeter does not provide relief valve.
Page 309 STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM Pump Test A 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 rpm. 3. Read and note the pump delivery at no pressure. 4.
Page 310 HYDRAULIC SYSTEM (2) Hydraulic Pump (3P Hydraulic System) Flowmeter Connecting and Test Preparation A When using a flowmeter other than KUBOTA specified flowmeter (Code No.: 07916-52792), be sure to use the instructions with that flowmeter. A The flowmeter does not provide relief valve.
Page 311 STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM Pump Test A 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 rpm. 3. Read and note the pump delivery at no pressure. 4.
Page 312: Regulator Valve
STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM (3) Regulator Valve Checking Regulating Valve Setting Pressure 1. Start the engine and warm up the transmission fluid, and then stop the engine. 2. Remove the pressure checking port (5) plug (PT 1/8). 3.
Page 313 STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM 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 (1) plug (PT 1/8) on the bi-speed valve (2). 3.
Page 314: Steering Controller
STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM (4) Steering Controller Relief Valve Setting Pressure 1. Remove the power steering delivery pipe from hydraulic pump. 2. Assemble the power steering delivery pipe (1) using a adaptor E (2) instead of original joint. 3.
Page 315: Three Point Hydraulic System
STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM (5) Three 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 rpm. 3.
Page 316 STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM 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 317: Disassembling And Assembling
STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM 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 318 STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM Removing Hydraulic Pump Assembly 1) Regulator Valve 1. Open the food and remove the side cover (RH). 2. Disconnect the accelerator wire (4) from the engine. 3. Remove the joint screw (2) and disconnect the power steering delivery hose (7).
Page 319 STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM Disassembling Hydraulic Pump 1) Disassembling Hydraulic Pump (Power Steering) 1. Remove the pump cover mounting screws (7). 2. Remove the drive gear (6), driven gear (2) and side plate (3) from the casing. (When reassembling) A Take care not to damage the gasket.
Page 320: Bi-Speed Valve
STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM 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. 1.
Page 321: Steering Cylinder
STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM Bi-speed Valve Assembly 1. The solenoid valve (4) (5) can be removed together with the connector. (1) Bi-speed Valve (5) Solenoid Valve (2) Filter (for PTO Clutch) (3) Orifice Valve (6) Connector (4) Solenoid Valve (7) Joint (for Bi-speed Clutch)
Page 322: Position Control Valve (3P Hydraulic System)
STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM (4) Position Control Valve (3P Hydraulic System) A 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. 0000007865E Separating Hydraulic Cylinder See page 3-S32.
Page 323: Hydraulic Cylinder Cover (3P Hydraulic System)
STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM Unload Poppet 1 and Unload Poppet 2 A Never loosen the lock nut (1). 1. Remove the plug (7). 2. Draw out the spring (6) and unload poppet 1 (5). 3. Remove the plug (2). 4.
Page 324 STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM Lowering Speed Adjusting Valve 1. Remove the split pin (12) and detach the washer (11) and spring (2). 2. Remove the internal snap ring (3) and draw out the adjusting shaft (1). 3.
Page 325: Hydraulic Cylinder (3P Hydraulic System)
STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM (6) Hydraulic Cylinder (3P 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 LH (4). 3.
Page 326: Auxiliary Control Valve
STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM (7) Auxiliary Control Valve Removing Auxiliary Control Valve See page 3-S24. 0000007873E Auxiliary Control Valve (1) Plug (2) Spring (3) Poppet (4) Poppet Seat (5) Pilot Valve (6) Check Valve (7) Spring (8) Plug (9) Collar (10) Collar Retainer...
Page 327: Servicing
STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM [3] SERVICING (1) Hydraulic Pump (Power Steering and 3P Hydraulic System) Housing Bore (Depth of Scratch) 1. Check for the scratch on the interior surface of the housing caused by the gear. 2.
Page 328: Steering Cylinder
STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM (2) Steering Cylinder Cylinder Tube, Rod Assembly and Cylinder Covers 1. Inspect the sliding surface of the cylinder tube, rod assembly and cylinder covers. 2. If they shows nicks or scoring, they must be replaced. 0000007880E Clearance between Rod and Cylinder Cover Bushing 1.
Page 329: Hydraulic Cylinder
STV32 · STV36 · STV40, WSM HYDRAULIC SYSTEM (3) 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 75.06 to 75.10 mm Factory spec.
Page 330: Electrical System
ELECTRICAL SYSTEM KiSC issued 04, 2006 A...
Page 331 CONTENTS 1. WIRING DIAGRAM......................9-M1 2. STARTING SYSTEM ......................9-M3 3. CHARGING SYSTEM.......................9-M4 4. LIGHTING SYSTEM ......................9-M5 [1] FLASHER UNIT ......................9-M6 [2] BRAKE LIGHT SWITCH ....................9-M7 5. BI-SPEED TURN SYSTEM .....................9-M8 [1] ELECTRICAL CIRCUIT ....................9-M8 6. OTHERS..........................9-M9 KiSC issued 04, 2006 A...
Page 332: Wiring Diagram
STV32,STV36,STV40, WSM ELECTRICAL SYSTEM 1. WIRING DIAGRAM Fuel Sensor Position Combination Switch Hazard Switch Main Switch Brake Light Light Switch Horn Lighting Flasher Engine Stop a b c d e Switch a b c d e B1 T 1 2 AC ST Solenoid Coolant...
Page 333 STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM B ... Black BR/Y ..Brown / Yellow R/G ..Red / Green G ..Green B/R ... Black / Red R/L ... Red / Blue L ... Blue B/W ..Black / White R/W ..
Page 334: Starting System
STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM 2. STARTING SYSTEM (1) Battery (2) Starter (3) PTO Relay (4) Starter Relay (5) Safety Switch (HST) (6) Safety Switch (Clutch Pedal) (7) Fuse (Starter) (8) Fuse (Main) (9) Fuse (Main Switch) (10) Main Switch (11) Fuse (Glow) (12) Fuse (Key Stop)
Page 335: Charging System
STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM 3. CHARGING SYSTEM (1) Battery (2) Fuse (Main) (3) Main Switch (4) Fuse (Main Switch) (5) Alternator (6) Fuse (Panel Board) (7) Instrument Panel (8) Charge Lamp The charging system supplies electric power for various devices and also charges the battery while the engine runs. 0000007889E KiSC issued 04, 2006 A 9-M4...
Page 336: Lighting System
STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM 4. LIGHTING SYSTEM (1) Battery (9) Hazard (17) Hazard Switch (25) Brake Light (Right) (2) Fuse (Main) (10) High Beam (18) Combination Switch (26) Position Light (Left) (3) Main Switch (11) Turn Signal (Right) (19) Flasher Unit (27) Turn Signal (Left) (4) Fuse (Main Switch)
Page 337: Flasher Unit
STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM [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 (13) is turned on. 2) The flasher unit blinks the turn signal light (3) or (4), when the turn signal switch (14) is turned clockwise or counterclockwise.
Page 338: Brake Light Switch
STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM [2] BRAKE LIGHT SWITCH When the broke 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 339: Bi-Speed Turn System
STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM 5. BI-SPEED TURN SYSTEM [1] ELECTRICAL CIRCUIT (1) Battery (5) Fuse (Panel Board) (9) Fuse (Control Box) (13) Bi-speed Control Box (2) Fuse (Main) (6) Alternator (10) Speed Sensor (14) Bi-speed Solenoid (3) Fuse (Main Switch) (7) Instrument Panel (11) Checking Connector...
Page 340: Others
STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM 6. OTHERS Refer to Workshop Manual for Diesel Engine Mechanism (Code No. 97897-01872) and Tractor Mechanism (Code No. 97897-18200) as following terms. [1] STARTING SYSTEM (1) Main Switch : [Type 1] in Workshop Manual for Tractor Mechanism. (2) Starter Motor : [Gear Reduction Type] in Workshop Manual for Diesel Engine Mechanism.
Page 341 CONTENTS 1. TROUBLESHOOTING....................... 9-S1 2. SERVICING SPECIFICATIONS ..................9-S5 3. TIGHTENING TORQUES ....................9-S6 4. CHECKING, DISASSEMBLING AND SERVICING ............9-S7 [1] CHECKING AND ADJUSTING ..................9-S7 (1) Battery ........................9-S7 (2) Main Switch ......................9-S8 (3) Fail Safe System (Bi-speed Turn System) .............. 9-S9 (4) Fine Adjustment (Bi-speed Turn System)..............
Page 342: Troubleshooting
STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM 1. TROUBLESHOOTING Reference Symptom Probable Cause Solution Page A Battery discharged or defective All Electrical Recharge or Replace G-25, 26 Equipment Do Not A Battery positive cable disconnected Connect Operate improperly connected A Battery negative cable...
Page 343 STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM STARTING SYSTEM Reference Symptom Probable Cause Solution Page A Battery discharged or defective Starter Motor Does Recharge or replace G-25, 26 Not Operate A Slow blow fuse (main, key switch) or fuse Replace G-34 (starter) blown...
Page 344 STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM LIGHTING SYSTEM Reference Symptom Probable Cause Solution Page A Fuse blown (15 A) Head Light Does Not Replace G-34 Light A Bulb blown Replace G-35 A Wiring harness disconnected or improperly Repair or replace connected (between main switch AC terminal and combination switch B1 terminal, between combination switch 1 terminal and head light,...
Page 345 STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM HORN Reference Symptom Probable Cause Solution Page Horn Does Not Sound A Combination switch defective Replace 9-S23 A Horn defective Replace A Wiring harness disconnected or improperly Replace or replace connected (between combination switch terminal and horn)
Page 346: Servicing Specifications
STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM 2. SERVICING SPECIFICATIONS Item Factory Specification Allowable Limit Starter Commutator 30.0 mm 29.0 mm (O.D.) 1.181 in. 1.142 in. Mica 0.50 to 0.80 mm 0.20 mm (Under Cut) 0.0197 to 0.0315 in. 0.0079 in.
Page 347: Tightening Torques
STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM 3. TIGHTENING TORQUES Tightening torques of screws, bolts and nuts on the table below are especially specified. (For general use screws, bolts and nuts : See page G-9.) Item ft-lbs Alternator (Pulley nut) 58.3 to 78.9 5.95 to 8.05 43.0 to 58.2...
Page 348: Checking, Disassembling And Servicing
STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM 4. CHECKING, DISASSEMBLING AND SERVICING A 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. A Never remove the battery cap while the engine is running.
Page 349: Main Switch
STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM (2) Main Switch Main Switch 1. Remove the panel board. 2. Disconnect the 4P connector and remove the main switch (1). 3. Perform the following checks. (1) Main Switch (2) 4P Connector 0000007897E Connector Voltage 1.
Page 350: Fail Safe System (Bi-Speed Turn System)
STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM 3) Main Switch Key at PREHEAT Position 1. Set and hold the main switch key at the PREHEAT position. 2. Measure the resistance with an ohmmeter across the B terminal and the G terminal, and measure the resistance across the B terminal and the AC terminal.
Page 351: Fine Adjustment (Bi-Speed Turn System)
STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM (4) 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 352: Self Diagnosis (Bi-Speed Turn System)
STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM (5) 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. Procedure 1: Making standard setting for the self-diagnosis 1.
Page 353: Bi-Speed Restraint Check (Bi-Speed Turn System)
STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM (6) 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). The following procedures are to check the travelling speed sensor output and the controller's bi-speed restraint function.
Page 354: Sensors, Bi-Speed And Solenoid Valve
STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM (7) Sensors, Bi-speed and Solenoid Valve Travelling Speed Sensor 1. Disconnect the connector (1). 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. - Range shift lever : 1 - Cruise control lever : 2 notches - Engine speed : around 1000 rpm...
Page 355 STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM 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). 4.
Page 356: Pto Clutch Control Switch
STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM 2)Output Voltage 1. Remove the connector for bi-speed valve. 2. Jack up the rear wheels and shift the front wheel drive lever to OFF position. 3. Start the engine and turn the rear wheels as following condition.
Page 357: Starter
STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM (9) Starter Motor Test A 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 358: Relays And Timer Relay
STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM Adjusting Safety Switches (Safety switch for clutch pedal) 1. Disconnect the safety switch connector (3) and remove the safety switch (2) once. 2. Fully depress the clutch pedal and hold it. 3. Connect the leads of the ohmmeter to the safety switch lead terminal.
Page 359 STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM PTO Relay 1. Turn the main switch off and remove the PTO relay (1). 2. Apply battery voltage across 1 and 2 terminals, and check for continuity across 3 and 5 terminals. 3.
Page 360 STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM 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. 3.
Page 361: Glow Plug
STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM Glow Lamp Timer 1. Turn the main switch of remove the glow lamp timer (1). 2. Connect the jumper leads as shown in the figure left. 3. If the bulb lights up when connecting a jumper lead to battery and go off about 5 seconds late, the glow lamp timer is proper.
Page 362: Engine Stop Solenoid
STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM (13)Engine Stop Solenoid Connector Voltage 1. Disconnect the 2P connector from engine stop solenoid. 2. Turn the main switch key to the "ON" position. 3. Measure the voltage with voltmeter between the terminal 1 (Black / White), terminal 2 (White / Black) and Body.
Page 363: Alternaotr
STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM (14)Alternaotr Alternator 1. Disconnect the 2P connector (3) from alternator after turning the main switch OFF. 2. Perform the following checkings. (1) B Terminal (3) 2P Connector (2) Alternator 0000007940E Connector Voltage 1.
Page 364: Combination Switch
STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM (15)Combination Switch Remove the Combination Switch 1. Remove the meter panel, and disconnect the combination switch 8P connector (1) after turning the main switch OFF position. 2. Perform the following checkings. (1) 8P Connector (2) Combination Switch 0000007941E 1) Connector Voltage...
Page 365 STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM 4) Light Switch Continuity when Setting Switch at LOW- BEAM Position 1. Measure the resistance with an ohmmeter across the B1 terminal to the T terminal and the B1 terminal to the 2 terminal. 2.
Page 366: Hazard Switch
STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM 8) Horn Switch Continuity 1. Measure the resistance with an ohmmeter across the B2 terminal to the H terminal. 2. If measurement is not following below, the horn switch is faulty. Resistance B2 terminal - T terminal Infinity (Switch at OFF)
Page 367: Position Light Switch
STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM (17)Position Light Switch Position Light Switch 1. Remove the meter panel and disconnect the 6P connector (2) from position light switch (1) after disconnect the battery negative code. 2. Remove position light switch (1). 3.
Page 368: Flasher Unit
STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM (18)Flasher Unit Flasher Unit Terminal Voltage 1. Disconnect the battery ground cable, and remove the instrument panel and panel under frame. 2. Disconnect the flasher unit connector (2) and connect the battery ground cable. 3.
Page 369: Brake Light Switch
STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM (19)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 370: Switches For Indicator Lamps (Rear Pto, Mid Pto, Parking Brake And Oil Pressure)
STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM (20)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. PTO Switch State Resistance...
Page 371: Gauges
STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM 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 372: Trailer Socket
STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM Coolant Temperature Sensor 1) Lead Terminal Voltage 1. Disconnect the lead from the coolant temperature sensor after turning the main switch off. 2. Turn the main switch on and measure the voltage with a voltmeter across the lead terminal and the chassis.
Page 373 STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM 2) Tail Terminals 1. Turn the main switch ON, and measure the voltage with voltmeter across the 7 terminal (1) and 3 terminal (3), and across the 5 terminal (2) and 3 terminal (3). 2.
Page 374: Disassembling And Assembling
STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM [2] DISASSEMBLING AND ASSEMBLING (1) Starter Disassembling Motor 1. Disconnect the connecting lead (9) from the magnet switch (8). 2. Remove the screws (6), and then separate the end frame (4), yoke (2) and armature (1). 3.
Page 375: Alternator
STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM (2) Alternator Pulley 1. Secure the hexagonal end of the pulley shaft with a double- ended ratchet wrench as shown in the figure, loosen the pulley nut with a socket wrench and remove it. (When reassembling) 58.3 to 78.9 Tightening torque...
Page 376 STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM Rectifier 1. Remove the four screws holding the rectifier and the stator lead wires. 2. Remove the rectifier (1). (1) Rectifier 0000002968E Rear End Frame 1. Unscrew the two nuts and two screws holding the drive end frame and the rear end frame.
Page 377 STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM Bearing on Drive End Side 1. Press out the bearing from drive end frame (3) with a press and jig (1). (1) Jig (3) Drive End Frame (2) Block 0000002972E Bearing at Slip Ring Side 1.
Page 378: Servicing
STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM [3] SERVICING (1) Starter Overrunning Clutch 1. Inspect the pinion for wear or damage. 2. If there is any defect, 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 379 STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM Brush Wear 1. If the contact face of the brush is dirty or dusty, clean it with emery paper. 2. Measure the brush length (A) with vernier calipers. 3. If the length is less than the allowable limit, replace the yoke assembly and brush holder.
Page 380: Alternaotr
STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM Field Coil 1. Check the continuity across the lead (1) and brush (2) with an ohmmeter. 2. If it does not conduct, replace the yoke assembly. 3. Check the continuity across the brush (2) and yoke (3) with an ohmmeter.
Page 381 STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM Rotor 1. Measure the resistance across the slip rings with an ohmmeter. 2. If the resistance is not the factory specification, replace it. 3. Check the continuity across the slip ring and core with an ohmmeter.
Page 382 STV32 · STV36 · STV40, WSM ELECTRICAL SYSTEM IC Regulator 1. Check the continuity across the B terminal and the F terminal of IC regulator with an analog ohmmeter. Conduct the test in the (R x 1) setting. 2. The IC regulator is normal if the IC regulator conducts in one direction and does not conduct in the reverse direction.
Page 383 EDITOR : KUBOTA FARM & INDUSTRIAL MACHINERY SERVICE, LTD. 64, ISHIZU-KITAMACHI, SAKAI-KU, SAKAI-CITY, OSAKA, 590-0823, JAPAN PHONE : ( 81 ) 72-241-1129 : ( 81 ) 72-245-2484 E-mail : ksos-pub@kubota.co.jp Printed in Japan 2006. 03, S, EI, EI, e Code No.9Y011-13041 KUBOTA Corporation 2004.

This manual is also suitable for:

Wsm stv36 Wsm stv40 Stv32 Stv36 Stv40

Kubota WSM STV32 Workshop Manual

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

10 Implement Limitations

Table of Contents

1 Troubleshooting

2 Servicing Specifications

4 Checking, Disassembling and Servicing

Table of Contents

3 Transmission

1 Structure

2 Power Train for Traveling System

3 Power Train for Pto System

Table of Contents

1 Troubleshooting

2 Servicing Specifications

4 Checking, Disassembling and Servicing

Table of Contents

Table of Contents

1 Troubleshooting

2 Servicing Specifications

3 Checking, Disassembling and Servicing

Table of Contents

1 Troubleshooting

2 Servicing Specifications

4 Checking, Disassembling and Servicing

Table of Contents

1 Troubleshooting

2 Servicing Specifications

4 Checking, Disassembling and Servicing

8 Hydraulic System

1 Structure

2 Whole Hydraulic Circuit

3 Hydraulic Pump

4 Regulator Valve

5 Bi-Speed Valve

6 Three Point Hydraulic System

7 Hydraulic Block Type Outlet

8 Auxiliary Control Valve

Table of Contents

1 Troubleshooting

2 Servicing Specifications

4 Checking, Disassembling and Servicing

9 Electrical System

1 Wiring Diagram

2 Starting System

3 Charging System

4 Lighting System

5 Bi-Speed Turn System

6 Others

Table of Contents

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Chapters

Troubleshooting

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Summary of Contents for Kubota WSM STV32