Kubota WSM STV36 User Manual (English)

Questions and Answers:

G
grobertsonAug 20, 2025
Why does my Kubota Tractor produce black exhaust gas?
- K
  Kathleen RiveraAug 21, 2025
  If your Kubota Tractor is producing black or dark gray exhaust, it could be due to several reasons. First, check if the tractor is overloaded and loosen the load if necessary. Using a low-grade fuel can also cause this issue, so switch to the specified fuel. A clogged fuel filter or air cleaner can also contribute to the problem; replace the fuel filter and clean or replace the air cleaner. Lastly, a deficient nozzle injection may be the cause, requiring you to repair or replace the nozzle.
C
Cynthia HaynesAug 23, 2025
How to fix an overheated engine on my Kubota WSM STV36?
- J
  James RuizAug 23, 2025
  If your Kubota Tractor is overheating, several factors could be responsible. Ensure that the engine oil and coolant levels are sufficient and replenish if needed. Inspect the fan belt for breaks or elongation and replace or adjust it. Clean any dust from the radiator net and fins, and address corrosion inside the radiator or coolant flow route by cleaning or replacing the affected parts. A defective radiator cap should also be replaced. Avoid overload running by loosening the load. Other potential causes include a defective head gasket (replace it), incorrect injection timing (adjust it), or unsuitable fuel (use the specified fuel).
M
Melissa GrayAug 26, 2025
Why is the engine revolution not smooth on my Kubota WSM STV36 Tractor?
- C
  Cassandra WagnerAug 26, 2025
  If your Kubota Tractor's engine revolution isn't smooth, it could stem from a few issues. Check if the fuel filter is clogged or dirty and change it if needed. Also, inspect the air cleaner for clogs and clean or replace it. A fuel leak due to a loose injection pipe retaining nut can cause this, so tighten the nut. Other potential causes include a malfunctioning injection pump (replace it), incorrect nozzle injection pressure (adjust it), a stuck or clogged injection nozzle (repair or replace it), or a malfunctioning governor (repair it).
B
Bridget JohnsonAug 28, 2025
How to troubleshoot water mixed into lubricant oil in Kubota Tractor?
- J
  Jacqueline KingAug 28, 2025
  If water is mixed into the lubricant oil of your Kubota Tractor, it could be due to a defective head gasket, which needs to be replaced. Alternatively, the cylinder block or cylinder head might be flawed, requiring replacement.
K
Karen BlackwellAug 30, 2025
What to do if the starter does not run on my Kubota WSM STV36?
- P
  pbradyAug 30, 2025
  If your Kubota Tractor's starter isn't running, begin by checking the battery charge and charge if necessary. If the battery is fine, the starter itself may be malfunctioning, requiring repair or replacement. The main switch could also be faulty, needing repair or replacement. Check the safety switch (clutch pedal, HST) for proper adjustment or defects, and repair or replace as needed. Additionally, inspect the starter relay and PTO relay; replace them if defective. Lastly, examine the fuse (30A, Starter) and replace it if blown.
N
Nicole FernandezSep 2, 2025
What causes white or blue exhaust gas from my Kubota WSM STV36?
- N
  Nancy BallardSep 2, 2025
  If your Kubota Tractor is emitting white or blue exhaust gas, it could be due to several reasons. One potential cause is excessive engine oil, so reduce it to the specified level. Another reason could be worn or stuck piston rings and cylinders, which would require repair or replacement. Incorrect injection timing can also lead to this issue, so adjust it accordingly. Lastly, deficient compression might be the problem, necessitating an adjustment of the top clearance.
P
Paul CunninghamSep 4, 2025
What causes deficient output in a Kubota WSM STV36 Tractor?
- L
  lunajesusSep 4, 2025
  If your Kubota Tractor has deficient output, it could be due to several reasons. Check for incorrect injection timing and adjust it as needed. Uneven fuel injection can also cause this issue, requiring the replacement of the injection pump. Additionally, a deficient nozzle injection may be the problem, necessitating repair or replacement of the nozzle. Finally, a compression leak could be the cause, requiring you to replace the head gasket and tighten the cylinder head screw, glow plug, and nozzle holder.
S
Samantha StephensSep 7, 2025
Why is fuel mixed into the lubricant oil in my Kubota WSM STV36?
- C
  Cheyenne KellySep 7, 2025
  If you notice fuel mixed into the lubricant oil of your Kubota Tractor, it could be due to a worn injection pump plunger, which requires replacing the pump. Another possible cause is deficient nozzle injection, meaning you should repair or replace the nozzle. In some cases, the injection pump may be broken, necessitating its replacement.
A
Andrea NelsonSep 9, 2025
What causes excessive lubricant oil consumption in my Kubota WSM STV36?
- J
  jenningshenrySep 9, 2025
  If your Kubota Tractor is experiencing excessive lubricant oil consumption, it could be due to several reasons. One possibility is that the piston ring gaps are facing the same direction, in which case you should shift the ring gap direction. Another cause could be a worn or stuck oil ring, requiring replacement. Additionally, a worn piston ring groove may be the issue, necessitating piston replacement. Lastly, worn valve stems and valve guides can lead to this problem, and they should be replaced.
T
Thomas TaylorSep 12, 2025
What causes low oil pressure in my Kubota Tractor?
- N
  Nicole NobleSep 12, 2025
  If your Kubota Tractor has low oil pressure, the following could be the reasons. The engine oil level might be insufficient, so replenish it. The oil filter could be clogged, so replace it. The relief valve might be stuck with dirt, so clean it. Using a different type of oil than specified can also cause low oil pressure, so use the specified type of oil. Lastly, the oil pump might be defective, so repair or replace it.

Kubota WSM STV36 Specifications

General

Brand	Kubota
Model	WSM STV36
Category	Tractor
Language	English

Summary

TO THE READER

SAFETY INSTRUCTIONS

SPECIFICATIONS

TRAVELLING SPEEDS

Details the various speed ranges for forward and reverse travel based on gear selection and tire size.

DIMENSIONS

Provides overall dimensions of the tractor, including length, width, height, and wheelbase.

G GENERAL

1. TRACTOR IDENTIFICATION

Locates and identifies the tractor identification plate and engine serial number.

2. GENERAL PRECAUTION

Outlines important precautions for disassembly, tool usage, and part handling.

3. HANDLING PRECAUTIONS FOR ELECTRICAL PARTS AND WIRING

Provides essential safety guidelines for working with the tractor's electrical system and wiring.

4. LUBRICANTS, FUEL AND COOLANT

Specifies the types and capacities of lubricants, fuel, and coolant required for the tractor.

5. TIGHTENING TORQUES

Lists tightening torque specifications for various screws, bolts, and nuts.

6. MAINTENANCE CHECK LIST

Provides a comprehensive schedule for regular maintenance checks based on operating hours.

7. CHECK AND MAINTENANCE

Details the procedures for routine checks and maintenance tasks.

[1] DAILY CHECK

Lists essential checks to be performed before operating the tractor each day.

8. SPECIAL TOOLS

Identifies specific tools required for engine and tractor maintenance and repair.

[1] SPECIAL TOOLS FOR ENGINE

Lists specialized tools needed for engine-related maintenance and repair procedures.

9. TIRES

Covers tire specifications, including pressure and tread configurations.

[1] TIRE PRESSURE

Specifies the correct tire inflation pressures for front and rear tires.

[2] TREAD

Details the front and rear wheel tread specifications and adjustment methods.

1 ENGINE

1. LUBRICATING SYSTEM

Explains the engine's lubricating system, including oil flow and components.

2. COOLING SYSTEM

Describes the engine's cooling system operation and components.

3. FUEL SYSTEM

Illustrates the fuel system's layout and operational flow.

1. TROUBLESHOOTING

Provides guidance on diagnosing and resolving common engine problems.

2. SERVICING SPECIFICATIONS

Lists factory specifications and allowable limits for engine components.

4. CHECKING, DISASSEMBLING AND SERVICING

Details procedures for checking, disassembling, and servicing engine parts.

[1] CHECKING AND ADJUSTING

Covers checks and adjustments for various engine sub-systems.

(1) Engine Body

Focuses on inspection and adjustment procedures for the engine's main body.

[3] DISASSEMBLING AND ASSEMBLING

Provides step-by-step instructions for disassembling and reassembling engine components.

(1) Cylinder Head and Valves

Details the procedure for removing and installing the cylinder head and valves.

(5) Cylinder

Covers inspection and correction procedures for cylinder wear.

2 CLUTCH

1. LINKAGE MECHANISM

Explains the linkage mechanism connecting the clutch pedal to the clutch.

1. TROUBLESHOOTING

Lists common clutch symptoms, probable causes, and solutions.

2. SERVICING SPECIFICATION

Provides factory specifications and allowable limits for clutch components.

4. CHECKING, DISASSEMBLING AND SERVICING

Details procedures for checking, disassembling, and servicing the clutch system.

[1] CHECKING AND ADJUSTING

Covers checks and adjustments for the clutch pedal free travel.

[3] DISASSEMBLING AND ASSEMBLING

Provides instructions for disassembling and assembling the clutch assembly.

3 TRANSMISSION

1. STRUCTURE

Illustrates the overall structure and components of the transmission system.

2. POWER TRAIN FOR TRAVELING SYSTEM

Details the power train components for the tractor's traveling system.

[1] HYDROSTATIC TRANSMISSION (HST)

Explains the structure and components of the hydrostatic transmission.

(1) Structure

Shows the assembly and identification of HST components.

(2) Hydraulic Circuit

Illustrates the hydraulic circuit diagram for the HST system.

(4) Operation and Valves

Describes the operation of the HST system and its associated valves.

[4] BI-SPEED TURN SYSTEM

Details the features and operation of the bi-speed turn system.

(1) Feature

Outlines the key features of the bi-speed turn system.

3. POWER TRAIN FOR PTO SYSTEM

Explains the power train components for the Power Take-Off (PTO) system.

[1] INDEPENDENT PTO SYSTEM

Details the hydraulic circuit and power train of the independent PTO system.

(1) Hydraulic Oil Flow

Illustrates the flow of hydraulic oil within the independent PTO system.

[2] REAR PTO GEAR SHIFT SECTION

Describes the components and function of the rear PTO gear shift mechanism.

1. TROUBLESHOOTING

Lists common transmission problems, their causes, and solutions.

2. SERVICING SPECIFICATIONS

Provides factory specifications and allowable limits for transmission components.

4. CHECKING, DISASSEMBLING AND SERVICING

Details procedures for checking, disassembling, and servicing the transmission.

[1] CHECKING AND ADJUSTING

Covers checks and adjustments for various transmission components.

Adjusting Neutral

Provides instructions for adjusting the neutral position of the HST.

[2] PREPARATION

Outlines preparation steps before disassembling major transmission assemblies.

(1) Separating Engine from Clutch Housing

Details the procedure for separating the engine from the clutch housing.

[3] DISASSEMBLING AND ASSEMBLING

Provides instructions for disassembling and assembling transmission components.

(1) Clutch Housing Case

Details the disassembly and assembly of the clutch housing case.

(2) Hydrostatic Transmission (HST)

Covers the disassembly and assembly procedures for the HST unit.

[4] SERVICING

Provides servicing procedures for various transmission sub-assemblies.

(1) Bi-speed Hydraulic Clutch and Gears

Details the servicing procedures for the bi-speed hydraulic clutch and gears.

4 REAR AXLE

1. STRUCTURE

Illustrates the structural components and layout of the rear axle assembly.

2. FINAL REDUCTION SYSTEM

Explains the planetary gear system used for final speed reduction and torque increase.

1. TROUBLESHOOTING

Lists common rear axle noises, probable causes, and solutions.

2. SERVICING SPECIFICATIONS

Provides factory specifications and allowable limits for rear axle components.

4. DISASSEMBLING AND SERVICING

Details procedures for disassembling and servicing the rear axle.

[1] DISASSEMBLING AND ASSEMBLING

Covers the disassembly and assembly of the planetary gear system.

Separating Rear Axle

Refers to the preparation section for separating the rear axle assembly.

[2] SERVICING

Provides servicing procedures for rear axle gear components.

Backlash between Internal Gear and Planetary Gear

Details the procedure for measuring and adjusting backlash in the planetary gear system.

5 BRAKES

1. BRAKE LINKAGE

Explains the mechanical linkage system for the travelling and parking brakes.

2. OPERATION

Describes the operational sequence of the brake system during braking.

1. TROUBLESHOOTING

Lists common braking problems, their causes, and solutions.

2. SERVICING SPECIFICATIONS

Provides factory specifications and allowable limits for brake system components.

3. CHECKING, DISASSEMBLING AND SERVICING

Details procedures for checking, disassembling, and servicing the brake system.

[1] CHECKING AND ADJUSTING

Covers checks and adjustments for the brake pedal free travel.

Brake Pedal Free Travel

Specifies the procedure for measuring and adjusting brake pedal free travel.

[2] DISASSEMBLING AND ASSEMBLING

Provides procedures for disassembling and assembling brake components.

Removing Brake Pedal

Refers to the preparation section for removing the brake pedal assembly.

[3] SERVICING

Details servicing procedures for brake components like cam plates and balls.

Height of Cam Plate and Ball

Covers measurement and inspection of cam plate and ball dimensions.

6 FRONT AXLE

1. STRUCTURE

Illustrates the structural components and layout of the front axle assembly.

1. TROUBLESHOOTING

Lists common front axle problems, their causes, and solutions.

2. SERVICING SPECIFICATIONS

Provides factory specifications and allowable limits for front axle components.

4. CHECKING, DISASSEMBLING AND SERVICING

Details procedures for checking, disassembling, and servicing the front axle.

[1] CHECKING AND ADJUSTING

Covers checks and adjustments for front wheel alignment.

Adjusting Toe-in

Provides instructions for adjusting the toe-in measurement of the front wheels.

[2] DISASSEMBLING AND ASSEMBLING

Details procedures for disassembling and assembling the front axle.

Separating Front Axle Assembly

Outlines steps for separating the front axle assembly from the frame.

[3] SERVICING

Provides servicing procedures for front axle gear components.

Bevel Gear Case and Front Gear Case

Covers the disassembly and assembly of the bevel gear and front gear cases.

7 STEERING

1. STRUCTURE

Illustrates the overall structure and components of the steering system.

2. HYDRAULIC CIRCUIT FOR POWER STEERING

Shows the hydraulic circuit diagram for the power steering system.

3. STEERING CYLINDER

Describes the construction and operation of the steering cylinder.

1. TROUBLESHOOTING

Lists common steering problems, their causes, and solutions.

2. SERVICING SPECIFICATIONS

Provides factory specifications and allowable limits for steering components.

4. CHECKING, DISASSEMBLING AND SERVICING

Details procedures for checking, disassembling, and servicing the steering system.

[1] CHECKING AND ADJUSTING

Covers checks and adjustments for the steering system.

Steering Wheel Operating Force

Specifies the procedure for measuring and adjusting steering wheel operating force.

[2] DISASSEMBLING AND ASSEMBLING

Provides procedures for disassembling and assembling steering components.

(1) Steering Controller

Details the disassembly and assembly procedures for the steering controller.

8 HYDRAULIC SYSTEM

1. STRUCTURE

Illustrates the overall structure and components of the hydraulic system.

2. WHOLE HYDRAULIC CIRCUIT

Presents the complete hydraulic circuit diagram for the tractor.

3. HYDRAULIC PUMP

Describes the hydraulic pump, its types, and specifications.

4. REGULATOR VALVE

Details the regulator valve's function and installation.

5. BI-SPEED VALVE

Explains the bi-speed valve, its solenoid valves, and connections.

[1] HYDRAULIC CIRCUIT

Shows the hydraulic circuit diagram for the bi-speed system.

6. THREE POINT HYDRAULIC SYSTEM

Details the hydraulic circuit for the three-point hitch system.

[1] HYDRAULIC CIRCUIT

Illustrates the hydraulic circuit for the three-point hitch system.

[2] POSITION CONTROL VALVE

Describes the position control valve, its components, and operation.

[5] HYDRAULIC CYLINDER

Covers the components and servicing procedures for the hydraulic cylinder.

7. HYDRAULIC BLOCK TYPE OUTLET

Explains the hydraulic block type outlet for operating implements.

8. AUXILIARY CONTROL VALVE

Details the auxiliary control valve, its circuit, and components.

9 ELECTRICAL SYSTEM

1. WIRING DIAGRAM

Provides a detailed wiring diagram of the tractor's electrical system.

2. STARTING SYSTEM

Explains the components and operation of the tractor's starting system.

3. CHARGING SYSTEM

Details the charging system, including battery and alternator.

4. LIGHTING SYSTEM

Covers the tractor's lighting system components and troubleshooting.

[1] FLASHER UNIT

Explains the function and testing of the flasher unit.

[2] BRAKE LIGHT SWITCH

Describes the brake light switch operation and continuity checks.

5. BI-SPEED TURN SYSTEM

Details the electrical circuit and self-diagnosis for the bi-speed turn system.

[1] ELECTRICAL CIRCUIT

Illustrates the electrical circuit diagram for the bi-speed turn system.

1. TROUBLESHOOTING

Lists common electrical system problems, causes, and solutions.

2. SERVICING SPECIFICATIONS

Provides factory specifications for various electrical system components.

4. CHECKING, DISASSEMBLING AND SERVICING

Details procedures for checking, disassembling, and servicing electrical components.

[1] CHECKING AND ADJUSTING

Covers checks and adjustments for key electrical system components.

(1) Battery

Provides procedures for checking battery condition and voltage.

(2) Main Switch

Details checks for the main switch continuity and connector voltage.

(5) Self Diagnosis (Bi-speed Turn System)

Explains the self-diagnosis mode for identifying bi-speed system faults.

(7) Sensors, Bi-speed and Solenoid Valve

Covers checks for travelling speed sensor, bi-speed solenoid valve.

(9) Starter

Provides motor and magnetic switch tests for the starter.

(10) Safety Switches

Details continuity checks for safety switches (clutch pedal, HST).

(15) Combination Switch

Covers checks for the combination switch, including connector voltage and continuity.

(19) Brake Light Switch

Details continuity checks and adjustment procedures for the brake light switch.

Related product manuals

Kubota WSM STV36 User Manual

Table of Contents

Questions and Answers:

Kubota WSM STV36 Specifications

Summary

TO THE READER

SAFETY INSTRUCTIONS

SPECIFICATIONS

TRAVELLING SPEEDS

DIMENSIONS

G 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

[1] DAILY CHECK

8. SPECIAL TOOLS

[1] SPECIAL TOOLS FOR ENGINE

9. TIRES

[1] TIRE PRESSURE

[2] TREAD

1 ENGINE

1. LUBRICATING SYSTEM

2. COOLING SYSTEM

3. FUEL SYSTEM

1. TROUBLESHOOTING

2. SERVICING SPECIFICATIONS

4. CHECKING, DISASSEMBLING AND SERVICING

[1] CHECKING AND ADJUSTING

(1) Engine Body

[3] DISASSEMBLING AND ASSEMBLING

(1) Cylinder Head and Valves

(5) Cylinder

2 CLUTCH

1. LINKAGE MECHANISM

1. TROUBLESHOOTING

2. SERVICING SPECIFICATION

4. CHECKING, DISASSEMBLING AND SERVICING

[1] CHECKING AND ADJUSTING

[3] DISASSEMBLING AND ASSEMBLING

3 TRANSMISSION

1. STRUCTURE

2. POWER TRAIN FOR TRAVELING SYSTEM

[1] HYDROSTATIC TRANSMISSION (HST)

(1) Structure

(2) Hydraulic Circuit

(4) Operation and Valves

[4] BI-SPEED TURN SYSTEM

(1) Feature

3. POWER TRAIN FOR PTO SYSTEM

[1] INDEPENDENT PTO SYSTEM

(1) Hydraulic Oil Flow

[2] REAR PTO GEAR SHIFT SECTION

1. TROUBLESHOOTING

2. SERVICING SPECIFICATIONS

4. CHECKING, DISASSEMBLING AND SERVICING

[1] CHECKING AND ADJUSTING

Adjusting Neutral

[2] PREPARATION

(1) Separating Engine from Clutch Housing

[3] DISASSEMBLING AND ASSEMBLING

(1) Clutch Housing Case

(2) Hydrostatic Transmission (HST)

[4] SERVICING

(1) Bi-speed Hydraulic Clutch and Gears

4 REAR AXLE

1. STRUCTURE

2. FINAL REDUCTION SYSTEM

1. TROUBLESHOOTING

2. SERVICING SPECIFICATIONS

4. DISASSEMBLING AND SERVICING

[1] DISASSEMBLING AND ASSEMBLING

Separating Rear Axle

[2] SERVICING

Backlash between Internal Gear and Planetary Gear

5 BRAKES

1. BRAKE LINKAGE