Kubota M6800 Parts and Parts Manual PDF

Kubota M6800 Parts

The Kubota M6800 is a versatile agricultural tractor known for its robust performance. Powered by a 4-cylinder diesel engine, it boasts 68 horsepower for efficient operation.

With a synchronized shuttle transmission, it offers 8 forward and 8 reverse speeds, ensuring adaptability to various tasks. The tractor features a 3-point hitch for implements, a rear PTO, and dual rear hydraulic remotes for enhanced functionality.

Equipped with a spacious operator platform, ergonomic controls, and a comfortable seat, the M6800 prioritizes user comfort.

Kubota M6800 Parts List

Here are some key components:

  1. Engine: Powered by a 4-cylinder diesel engine, the M6800’s engine provides the tractor with 68 horsepower for efficient performance.
  2. Transmission: Equipped with a synchronized shuttle transmission, the tractor offers 8 forward and 8 reverse speeds, allowing for adaptability to different tasks.
  3. Hydraulic System: The hydraulic system includes components such as hydraulic pumps, valves, and cylinders. It enables the tractor to operate hydraulic implements and perform tasks like lifting and lowering.
  4. 3-Point Hitch: The tractor features a 3-point hitch at the rear, allowing for the attachment of various implements like plows, mowers, and other farming tools.
  5. PTO (Power Take-Off): The rear PTO allows the tractor to transfer power to attached implements, enabling them to operate.
  6. Dual Rear Hydraulic Remotes: These provide additional hydraulic connections at the rear of the tractor, allowing for the use of multiple hydraulic implements simultaneously.
  7. Operator Platform: The M6800 is designed with a comfortable and spacious operator platform that includes ergonomic controls and a comfortable seat for the operator.
  8. Front Axle and Wheels: The tractor’s front axle and wheels support the front end of the machine, providing stability and steering capability.
  9. Rear Axle and Tires: The rear axle and tires support the tractor’s rear end and provide traction for various field conditions.
  10. Electrical System: Components such as lights, gauges, and the electrical wiring system contribute to the tractor’s electrical functions.
  11. Fuel System: The fuel system includes components like the fuel tank, fuel pump, and injectors, ensuring proper fuel delivery to the engine.

Kubota M6800 Parts Diagram

You can find the parts diagram for the Kubota M6800 tractor on several websites, including Messicks, Coleman Equipment, and Jacks Small Engines.

These diagrams provide exploded views and part numbers for various components of the tractor, such as attachments, hydraulic systems, front axle, and steering components. You can use these diagrams to identify and order the specific parts you need for your Kubota M6800 tractor.

You can find the parts diagram for the Kubota M6800 tractor on the following websites:

Jacks Small Engines: Provides exploded view parts lookup by model, including front axle and steering components.
Messicks: Offers parts diagrams for the Kubota M6800S-CAB (2wd / Cabin) and allows you to select your diagram and shop for frequently purchased parts.
Coleman Equipment: Offers genuine OEM parts online or in-store, including a parts diagram for the Kubota M6800/M6800S Tractors.

Kubota M6800 Horsepower

The Kubota M6800 tractor is equipped with a 4-cylinder diesel engine that provides a maximum engine gross horsepower of approximately 68 horsepower (50.7 kW).
This power output allows the tractor to handle various agricultural tasks efficiently. Keep in mind that the usable power at the PTO (Power Take-Off) or on the ground may be slightly lower due to factors like transmission losses.

Kubota M6800 Oil Capacity

The engine oil capacity for the Kubota M6800 tractor is approximately 10.6 quarts (10.0 liters) with an oil filter change.
It’s important to note that this capacity is based on the standard configuration, and actual oil capacity may vary slightly depending on factors such as the specific model, engine variation, and whether any modifications have been made.

Kubota M6800 Seat

The Kubota M6800 tractor typically comes with a comfortable operator seat designed to provide support during long hours of operation. The specific features of the seat may vary depending on the model year and any optional upgrades chosen by the owner.

Some common characteristics of the Kubota M6800 tractor seat include:

  1. Adjustability: The seat is often adjustable to accommodate different operator preferences and body sizes. This may include features like adjustable height and suspension.
  2. Ergonomic Design: The seat is designed with ergonomics in mind, providing support to reduce operator fatigue during extended use.
  3. Vinyl or Fabric Covering: The seat is typically covered in a durable material, such as vinyl or fabric, to withstand various weather conditions and provide easy cleaning.
  4. Seat Belt: For safety, the tractor may be equipped with a seat belt to secure the operator while operating the machine.

Kubota M6800 Fuel Filter

The Kubota M6800 tractor is equipped with a fuel filter that helps ensure clean fuel is delivered to the engine. The specific fuel filter for the M6800 may vary depending on factors such as the model year and any modifications that have been made.
However, a common fuel filter for the Kubota M6800 is the Kubota part number 15231-43560.

Some signs of a clogged fuel filter on a Kubota M6800 tractor include:

  1. Difficulty Starting: If the tractor has trouble starting or struggles to turn over, a clogged fuel filter may be the cause
  2. Loss of Power or Stalling: A clogged fuel filter can lead to a loss of power during operation or cause the engine to stall intermittently
  3. Rough Running: The engine may run rough, especially when hot, if the fuel filter is clogged
  4. Fuel Suction Issues: A clogged fuel filter can result in fuel suction problems, leading to issues with the fuel transfer pump and causing the tractor to run poorly or stall.

Kubota M6800 Hydraulic Fluid Capacity

The hydraulic fluid capacity of the Kubota M6800 tractor depends on various factors, including the specific model, configuration, and any additional hydraulic components or attachments.
Generally, the hydraulic system on the M6800 may have a total capacity ranging from approximately 12 to 15 gallons (45 to 57 liters).

Kubota M6800 Hydraulic Filter

The specific hydraulic filter for the Kubota M6800 tractor may vary depending on the model year and any modifications made to the hydraulic system. However, a common hydraulic filter for the M6800 is the Kubota part number HH670-37710.

Signs of a clogged hydraulic filter on a tractor may include:

  1. Slow or Weak Lifting: The hydraulic system may struggle to lift implements or loads, or the lifting action may be slower than usual.
  2. Overheating: A clogged hydraulic filter can lead to increased operating temperatures in the hydraulic system.
  3. Erratic Operation: The tractor’s hydraulic system may exhibit erratic behavior, such as jerky movements or unresponsive controls.
  4. Increased Noise: A clogged filter can cause the hydraulic system to produce unusual noises during operation.

If you notice any of these signs, it is advisable to inspect the hydraulic system and the filter for potential clogging and address the issue promptly to prevent damage to the tractor’s hydraulic components.

Kubota M6800 Clutch Replacement

Here is a general guide for replacing the clutch on a tractor:

Materials Needed:

  • New clutch kit (includes clutch disc, pressure plate, and release bearing)
  • Wrenches and sockets
  • Torque wrench
  • Jack and jack stands
  • Clutch alignment tool
  • Transmission fluid (if necessary)
  • Service manual for your Kubota M6800


  1. Safety Precautions:
    • Ensure the tractor is turned off and in gear.
    • Place the tractor on a level surface and engage the parking brake.
  2. Disconnect Battery:
    • Disconnect the tractor’s battery to ensure safety during the replacement.
  3. Remove the Transmission:
    • Follow the steps outlined in the service manual to remove the transmission. This may involve removing the driveline, PTO shaft, and any other components obstructing access to the clutch.
  4. Remove the Old Clutch Components:
    • Remove the pressure plate and clutch disc by loosening the bolts gradually and in a star pattern.
    • Inspect the flywheel for any damage or wear.
  5. Install the New Clutch:
    • Install the new clutch disc, pressure plate, and release bearing from the clutch kit.
    • Use the clutch alignment tool to ensure proper alignment during installation.
  6. Torque the Bolts:
    • Tighten the pressure plate bolts in a star pattern to the manufacturer’s specifications using a torque wrench.
  7. Reinstall the Transmission:
    • Follow the service manual instructions to reinstall the transmission, ensuring proper alignment.
  8. Adjust the Clutch:
    • Adjust the clutch pedal according to the specifications in the service manual to ensure proper engagement and disengagement.
  9. Check for Leaks:
    • After reassembly, check for any hydraulic or transmission fluid leaks.
  10. Test Drive:
    • Test the tractor to ensure the clutch is functioning correctly. Pay attention to engagement, disengagement, and any unusual noises.

Kubota M6800 AC Compressor

The Kubota M6800 tractor may be equipped with an air conditioning (AC) system to provide comfort for the operator during operation in hot weather. The AC system includes components such as the AC compressor, condenser, evaporator, and other related parts.

If you are specifically interested in the AC compressor for the Kubota M6800, it’s important to note that the specific model and part number may vary depending on factors like the tractor’s model year and any optional features. Commonly, Kubota tractors use Sanden compressors.

Kubota M6800 Hydraulic Pump

To troubleshoot a hydraulic pump on a Kubota M6800 tractor, you can follow these general steps:
  1. Check Hydraulic Fluid Level: Ensure that the hydraulic fluid level is adequate. Low fluid levels can cause the pump to operate inefficiently or lead to cavitation.
  2. Inspect for Leaks: Check the hydraulic system for any signs of leaks, as leaks can result in reduced system pressure and cause the pump to work harder.
  3. Test Hydraulic Pressure: Use a pressure gauge to measure the hydraulic pressure at various points in the system. Deviations from the specified pressure levels can indicate pump issues.
  4. Check Suction Line and Filter: Inspect the suction line for any blockages or damage. Additionally, examine the hydraulic filter for clogging, as a restricted filter can strain the pump.
  5. Monitor Pump Noise and Temperature: Unusual noise or excessive heat from the hydraulic pump can be indicative of internal problems.
  6. Seek Professional Assistance: If the above steps do not identify the issue, it may be necessary to consult a qualified technician or service manual for further diagnosis.

Replacement door on a Kubota M6800 Ultra Cab 2

Replacing a door on the Kubota M6800 Ultra Cab 2 involves a few steps. Here’s a general guide, but keep in mind that the specifics may vary based on the model year and exact configuration of your tractor:

Materials Needed:

  • Replacement door
  • Socket and wrench set
  • Screwdriver
  • New weatherstripping (if needed)


  1. Safety First:
    • Ensure the tractor is turned off, and the parking brake is engaged.
  2. Remove the Old Door:
    • Using a socket and wrench, remove the bolts securing the old door to the tractor.
  3. Disconnect Wiring (if applicable):
    • If your tractor has electrical components on the door (such as lights or mirrors), disconnect the wiring.
  4. Remove Weatherstripping (if needed):
    • If the weatherstripping is damaged or needs replacement, carefully remove it from the old door.
  5. Prepare the New Door:
    • If the replacement door does not come with weatherstripping, transfer the old weatherstripping to the new door.
  6. Attach the New Door:
    • Align the new door with the hinges and secure it in place using the bolts.
    • Tighten the bolts securely but avoid over-tightening.
  7. Reconnect Wiring (if applicable):
    • If there were electrical components, reconnect the wiring for lights or mirrors.
  8. Check Alignment:
    • Ensure the new door is aligned properly and opens and closes smoothly.
  9. Test the Door:
    • Open and close the door to ensure it operates correctly.
  10. Tighten and Adjust:
    • Double-check all bolts for tightness and make any necessary adjustments to ensure proper fit and alignment.

Fixing PTO slipping on a Kubota M6800

If the Power Take-Off (PTO) on your Kubota M6800 is slipping, it can be an indication of several issues. Here are steps to troubleshoot and address the problem:

  1. Check PTO Engagement:
    • Ensure that you are fully engaging the PTO lever. Sometimes, incomplete engagement can cause slipping.
  2. Inspect PTO Shaft:
    • Examine the PTO shaft for any signs of damage, wear, or missing parts. Replace any damaged or worn components.
  3. Verify Hydraulic Fluid Level:
    • Ensure that the hydraulic fluid level is within the recommended range. Low hydraulic fluid can lead to PTO slipping.
  4. Check for Hydraulic Leaks:
    • Inspect the hydraulic system for any leaks, especially around the PTO components. Repair any leaks and replace damaged hoses or fittings.
  5. Inspect Clutch:
    • The PTO clutch may be worn or damaged. Check for signs of wear or damage on the clutch plates. If necessary, replace the clutch assembly.
  6. Adjust PTO Clutch:
    • If your tractor has an adjustable PTO clutch, consult the manual for proper adjustment procedures. Adjust the clutch according to the manufacturer’s specifications.
  7. Examine PTO Overrunning Clutch:
    • Some tractors have an overrunning clutch in the PTO system. Inspect it for wear or damage and replace if necessary.
  8. Check PTO Output Shaft:
    • Inspect the PTO output shaft for any damage or wear. If the splines are worn, it may cause slipping. Replace the shaft if needed.
  9. Inspect PTO Brake:
    • Some tractors have a PTO brake that engages when the PTO is disengaged. Check the brake for proper operation. Adjust or replace if necessary.
  10. Consult the Manual:
    • Refer to the Kubota M6800 manual for specific troubleshooting steps and adjustment procedures related to the PTO system.

Kubota M6800 Water Pump

If you need to replace the water pump on your Kubota M6800, here’s a general guide. Keep in mind that specific steps may vary based on the model year and configuration of your tractor. It’s essential to consult your tractor’s manual for accurate information.

Materials Needed:

  • Replacement water pump
  • Coolant
  • Socket and wrench set
  • Screwdrivers
  • Gasket sealant
  • Coolant hoses (if needed)


  1. Safety First:
    • Ensure the tractor is turned off, and the engine is cool.
    • Place the tractor on a level surface and engage the parking brake.
  2. Drain Coolant:
    • Drain the coolant from the radiator into a suitable container.
  3. Locate the Water Pump:
    • The water pump is typically located near the front of the engine and is connected to the engine block.
  4. Remove Belts:
    • Loosen and remove the belts that drive the water pump. This may involve loosening the tensioner and sliding the belts off the pulleys.
  5. Remove Hoses:
    • Disconnect the coolant hoses connected to the water pump.
  6. Remove Water Pump:
    • Using a socket and wrench, remove the bolts securing the water pump to the engine.
    • Carefully remove the old water pump.
  7. Clean Surfaces:
    • Clean the mounting surface on the engine block where the water pump attaches.
  8. Install New Water Pump:
    • Place the new water pump in position and secure it with the bolts. Ensure proper alignment.
  9. Connect Hoses:
    • Reconnect the coolant hoses to the new water pump.
  10. Install Belts:
    • Place the belts back on the pulleys and adjust the tension.
  11. Refill Coolant:
    • Refill the radiator with the appropriate coolant mixture. Bleed air from the system as needed.
  12. Start the Engine:
    • Start the engine and check for any leaks around the water pump.
  13. Check for Proper Operation:
    • Ensure that the water pump is functioning correctly, and the engine is maintaining the proper operating temperature.

Kubota M6800 Problems

Common problems include:

  1. Hydraulic Leaks:
    • Hydraulic fluid leaks can occur, often around hoses, fittings, or the hydraulic pump.
  2. PTO Issues:
    • Problems with the Power Take-Off (PTO) system, such as slippage or difficulty engaging, have been reported.
  3. Starter Problems:
    • Occasional starter issues, including difficulty starting the engine, have been noted.
  4. Electrical Issues:
    • Some users have reported electrical problems, such as issues with lights, gauges, or the ignition system.
  5. Clutch Troubles:
    • Clutch-related problems, such as slipping or difficulty engaging gears, have been mentioned.
  6. Cooling System Concerns:
    • Overheating issues may occur, potentially due to problems with the thermostat, radiator, or coolant levels.
  7. Transmission Problems:
    • Users have reported occasional transmission-related issues, including difficulty shifting gears.
  8. Fuel System Challenges:
    • Fuel-related problems, such as clogged filters or injector issues, have been mentioned.