Kubota M125X Parts and Parts Manual PDF

Kubota M125X Parts and Specs

Specifications for the Kubota M125X:

  1. Engine: The M125X is powered by a 4-cylinder, turbocharged, intercooled diesel engine.
  2. Displacement: The engine typically has a displacement of around 6.1 liters, providing ample power for various tasks.
  3. Horsepower: It delivers approximately 125 horsepower (hence the “M125” designation), making it suitable for a wide range of applications, including field work, material handling, and towing.
  4. Transmission: It features a synchronized shuttle transmission with multiple speeds forward and reverse, allowing for efficient operation and versatility in different tasks and terrains.
  5. PTO (Power Take-Off): The M125X usually comes with a rear PTO, enabling the attachment of various implements such as mowers, tillers, and balers.
  6. Hydraulics: The tractor is equipped with a hydraulic system capable of powering implements and attachments that require hydraulic power.
  7. Weight: The weight of the Kubota M125X can vary depending on configuration and additional equipment, but it typically falls within the medium to heavy-duty range for tractors of its class.
  8. Cab: Some models come with a comfortable, enclosed cab featuring air conditioning, heating, and ergonomic controls for operator comfort during long hours of operation.
  9. Tires: It often comes with agricultural tires suitable for different types of terrain, providing traction and stability during fieldwork.
  10. Dimensions: Specific dimensions such as length, width, and height can vary slightly depending on the model and optional equipment.

Kubota M125X Parts Manual PDF

  1. Introduction: This section usually provides an overview of the manual’s purpose, how to use it, and any safety precautions or warnings related to handling tractor parts.
  2. Table of Contents: A listing of all sections, subsections, and parts covered in the manual, allowing users to quickly locate specific information.
  3. Illustrated Parts Breakdown: Detailed diagrams or exploded views of the tractor’s major components and assemblies, with part numbers and descriptions for easy identification.
  4. Engine Parts: Information on engine components such as the cylinder head, pistons, crankshaft, valves, fuel system, and cooling system parts.
  5. Transmission and Drivetrain: Details on the transmission, clutch, differential, axles, driveshaft, and other drivetrain components.
  6. Hydraulic System: Information about hydraulic pumps, valves, cylinders, hoses, fittings, and other hydraulic system parts.
  7. PTO and Three-Point Hitch: Parts related to the power take-off (PTO) system, three-point hitch, lift arms, linkages, and associated components.
  8. Electrical System: Components of the tractor’s electrical system, including the battery, alternator, starter motor, wiring harnesses, switches, lights, and gauges.
  9. Chassis and Frame: Parts pertaining to the tractor’s chassis, frame, front axle, rear axle, wheels, tires, and steering system.
  10. Cab and Operator Controls: Information about cab components, seats, controls, levers, pedals, air conditioning, heating, and other operator amenities.
  11. Accessories and Attachments: Details on optional accessories and attachments compatible with the Kubota M125X, such as loaders, mowers, blades, and buckets.
  12. Index: A comprehensive index listing all parts and their corresponding page numbers, aiding in quick reference and navigation.

Kubota M125X Parts Online

You can find Kubota M125X parts online at various retailers. Websites like MalpasOnline, Jensales, and Agriline Products offer a wide range of tractor replacement spare parts and accessories for the Kubota M125X.

These parts include products such as air conditioning, electrical components, filters, lights, radiator and cooling system parts, and manuals.

Kubota M125X Problems

Here are some common problems reported by owners:

  1. Engine Issues: This could include problems with starting, loss of power, overheating, or unusual noises. Common causes might include fuel system issues, cooling system problems, or issues with engine components such as the fuel injectors or turbocharger.
  2. Transmission Problems: Issues with the transmission could manifest as difficulty shifting gears, slipping gears, or strange noises during operation. Possible causes may include low transmission fluid levels, worn clutch components, or hydraulic system malfunctions.
  3. Electrical System Faults: Electrical problems might include issues with starting the tractor, malfunctioning gauges or lights, or problems with the charging system. This could be caused by faulty wiring, a weak battery, a malfunctioning alternator, or issues with switches and relays.
  4. Hydraulic System Troubles: Problems with the hydraulic system could result in issues with lifting and lowering implements, leaks, or poor hydraulic performance. Causes might include hydraulic fluid leaks, worn seals, or problems with hydraulic valves and cylinders.
  5. PTO (Power Take-Off) Malfunctions: If the PTO system isn’t engaging or disengaging properly, it can affect the operation of attached implements. This could be due to issues with the PTO clutch, linkage, or electrical components.
  6. Cooling System Problems: Overheating can be caused by issues such as a malfunctioning radiator, coolant leaks, a faulty thermostat, or a clogged cooling system.
  7. Fuel System Issues: Problems with the fuel system might include fuel leaks, clogged fuel filters, or issues with the fuel injection system, leading to poor engine performance or difficulty starting the tractor.
  8. Tire and Suspension Problems: Issues with tires or suspension components could affect the tractor’s stability, traction, and ride comfort. Common problems include flat tires, worn suspension components, or misaligned wheels.

Kubota M125X Reviews

Summary of common points mentioned in reviews:

  1. Power and Performance: Many users praise the M125X for its ample power and performance, particularly for medium to heavy-duty tasks in agriculture and construction. The tractor’s 125 horsepower engine provides sufficient power for a wide range of applications, from field work to material handling.
  2. Reliability: Kubota is known for producing reliable machinery, and the M125X is no exception according to many reviews. Users often mention the tractor’s durability and dependability, even under demanding conditions.
  3. Comfort and Ergonomics: The tractor’s cab is typically well-received for its comfort and ergonomic design. Features such as air conditioning, heating, adjustable seating, and easy-to-reach controls contribute to operator comfort during long hours of operation.
  4. Versatility: Users appreciate the M125X’s versatility, thanks to its compatible attachments and implements. The tractor’s PTO system and three-point hitch allow for easy attachment of various tools and implements, making it suitable for a wide range of tasks.
  5. Maintenance and Serviceability: Reviews often highlight the tractor’s ease of maintenance and serviceability. Accessible service points, straightforward maintenance procedures, and good dealer support contribute to positive user experiences.
  6. Fuel Efficiency: Many users report that the M125X is relatively fuel-efficient for its size and power, which can result in cost savings over time, especially for operators with high usage.
  7. Transmission: The tractor’s transmission is generally praised for its smooth operation and ease of use. Users appreciate the synchronized shuttle transmission, which allows for seamless forward and reverse operation.
  8. Price and Value: While the initial purchase price of the M125X may be higher compared to some competitors, users often find that the tractor’s performance, reliability, and resale value justify the investment.

Kubota M125X Diagnostic Plug Location

The diagnostic plug on a Kubota M125X is not a standard OBD-I or OBD-II port found in most modern vehicles. It is a proprietary connector specific to Kubota tractors.

The exact location of the diagnostic plug may vary, but it is typically located within the tractor’s engine compartment. To access it, you may need to refer to the tractor’s service manual or contact a Kubota dealership for assistance

Kubota M125X Front Axle Breakdown

The symptoms of a front axle breakdown on a Kubota M125X can include unusual noises, such as grinding or clicking, especially when turning, reduced or erratic 4WD engagement, and oil leaks around the front axle area.

Additionally, issues with the front differential, such as stripped splines on the front differential pinion gear, can indicate a potential front axle problem.

If you experience any of these symptoms, it is important to have the front axle inspected and repaired by a qualified technician to prevent further damage.

Potential causes of a front axle breakdown on a tractor like the Kubota M125X can include lack of maintenance, overloading, improper use, or normal wear and tear.

Without proper maintenance, components such as the front axle knuckle seal can wear out, leading to potential damage. It’s important to adhere to the manufacturer’s maintenance schedule and guidelines to prevent front axle issues.

Additionally, factors such as operating conditions and environmental stress can contribute to front axle wear and failure. Regular inspection and maintenance of the front axle are essential to ensure the continued reliability and performance of the tractor

Kubota M125X Fuse Box

The location of the fuse box on your Kubota M125X can vary depending on the model year and configuration. Here’s a breakdown of the most common locations:

1. Under the Instrument Panel:

This is the most common location for the fuse box on Kubota tractors. Look for a covered panel near the steering wheel or dashboard.

2. Engine Compartment:

The fuse box may be located near the engine control unit (ECU) or on the firewall in the engine compartment.

3. Near the Operator’s Platform:

In some models, the fuse box might be found under the seat or near the pedals on the operator’s platform.

Additional Tips:

  • Consult your Kubota M125X operator’s manual for the exact location of the fuse box in your specific model. You can usually download a copy from the Kubota website.
  • The fuse box may be labeled with a diagram showing the location and function of each fuse.
  • If you’re still having trouble finding the fuse box, contact your local Kubota dealer for assistance.

Here are some important safety precautions to remember when working with fuses:

  • Always turn off the engine and remove the key before working on the fuse box.
  • Use the correct size and type of fuse when replacing a blown fuse.
  • Never use a metal object to bridge a blown fuse, as this can create a fire hazard.

Kubota M125X PTO

Types of PTO on Kubota M125X:

  • Rear PTO: This is the most common type of PTO and is located at the rear of the tractor. It is used to power implements such as mowers, balers, and trailers. The M125X features a rear PTO with two speeds: 540 RPM and 1000 RPM.
  • Mid PTO (Optional): This PTO is located on the side of the tractor and is used to power implements such as flail mowers and snowblowers. The M125X does not have a mid PTO as standard equipment, but it is available as an option.

PTO Engagement:

The PTO on the M125X is engaged using a lever located on the console to the right of the operator’s seat. The lever has three positions: Off, 540 RPM, and 1000 RPM.

PTO Safety Features:

The M125X comes equipped with several safety features to prevent accidental PTO engagement, including:

  • PTO interlock: The PTO will not engage if the tractor is not in neutral gear and the parking brake is not engaged.
  • PTO override switch: This switch allows the operator to temporarily override the PTO interlock, but it will only function for a few seconds.
  • PTO shaft brake: This brake automatically engages when the PTO is disengaged, stopping the PTO shaft from spinning.

Using the PTO:

To use the PTO, follow these steps:

  1. Make sure the tractor is in neutral gear and the parking brake is engaged.
  2. Select the desired PTO speed (540 RPM or 1000 RPM).
  3. Start the engine.
  4. Raise the implement or attachment to the desired height.
  5. Engage the PTO by moving the lever to the desired position.
  6. Lower the implement or attachment to begin work.
  7. When you are finished using the PTO, disengage it by moving the lever to the Off position.
  8. Raise the implement or attachment and stop the engine.

Important safety precautions:

  • Always read and understand the operator’s manual before using the PTO.
  • Never engage the PTO while the engine is running.
  • Always disengage the PTO and stop the engine before raising or lowering an implement or attachment.
  • Be aware of your surroundings and make sure there are no people or objects in the way of the PTO shaft when it is engaged.

Kubota M125X Headlights

The Kubota M125X comes equipped with standard halogen headlights that provide illumination for nighttime operation. However, there are various aspects to consider:

Types of Headlights:

  • Standard Halogen: These are the factory-installed lights, offering decent nighttime visibility but potentially less efficient than LED options.
  • LED Upgrade: Many aftermarket LED headlight options are available, delivering brighter light, lower power consumption, and potentially longer lifespan.

Location and Replacement:

  • The headlights are typically located on the front cowling of the tractor, protected by clear lenses.
  • Refer to your operator’s manual for specific instructions on accessing and replacing the bulbs.
  • Replacement bulbs can be sourced through Kubota dealers, online retailers, or auto parts stores, ensuring compatibility with your model.

Additional Information:

  • The M125X may offer additional lighting options, such as work lights or rear lights, depending on the configuration.
  • Consider your specific needs and operating conditions when choosing between halogen and LED headlights.
  • Always remember to turn off headlights when not in use to conserve battery life.


  • Kubota M125X Operator’s Manual: Provides detailed information on headlight locations, replacement procedures, and safety precautions. Download or purchase a copy from the Kubota website.
  • Kubota Parts Diagrams: The Kubota website offers exploded diagrams of the front cowling assembly, helping you visualize headlight component locations.
  • Online Retailers: Websites like Messicks or Agriline Products offer replacement bulbs and LED upgrade kits for various Kubota models.
  • Local Kubota Dealer: They can provide genuine Kubota parts, installation assistance, and expert advice.


  • Ensure headlights are clean and functional for optimal night visibility.
  • Adjust headlight aim properly to avoid blinding oncoming traffic.
  • Use headlights responsibly and follow local regulations for nighttime operation.

Kubota M125X Gear Problems

Gear problems can arise in various components of the tractor, including the transmission, drivetrain, and PTO system.

  1. Transmission Issues:
    • Gear Slippage: This can occur when shifting between gears, resulting in the transmission slipping out of gear unexpectedly. It could be caused by worn synchronizers, damaged gears, or improper adjustment.
    • Difficulty Shifting: Users might experience difficulty shifting gears, especially when the tractor is cold or under load. This could be due to problems with the clutch, linkage, or hydraulic system.
    • Gear Grinding: Grinding noises when shifting gears can indicate issues with the synchronizers, clutch, or gear teeth. It’s essential to address this promptly to prevent further damage to the transmission.
  2. PTO Problems:
    • PTO Slippage: If the power take-off (PTO) system is slipping, it may fail to transfer power effectively to attached implements. This could be caused by worn PTO clutch components, improper adjustment, or hydraulic system issues.
    • PTO Engagement Issues: Difficulty engaging or disengaging the PTO can result from problems with the clutch, linkage, or electrical components controlling the PTO engagement.
  3. Drivetrain Troubles:
    • Differential Problems: Issues with the differential could result in uneven power distribution to the wheels, causing one wheel to spin more than the other. This can affect traction and maneuverability.
    • Axle Damage: Damage to the axles, such as bent or broken shafts, can lead to gear problems and affect the tractor’s drivability.
    • Gearbox Leaks: Leaks in the gearbox can lead to low gear oil levels, causing premature wear on gears and bearings.
  4. Hydraulic System Complications:
    • Hydraulic Gear Problems: Issues with hydraulic pumps, valves, or cylinders can affect the tractor’s hydraulic system, leading to problems with lifting and lowering implements or controlling hydraulic functions.

Kubota M125X Power Steering Pump Replacement

Replacing the power steering pump on a Kubota M125X tractor involves several steps. Here’s a general outline of the process:

  1. Gather Necessary Tools: Before starting, make sure you have the required tools and equipment, including wrenches, sockets, a torque wrench, pliers, and a power steering pump pulley removal tool.
  2. Prepare the Tractor: Park the tractor on a level surface and engage the parking brake. Turn off the engine and allow it to cool down. If necessary, disconnect the battery to prevent electrical accidents.
  3. Access the Power Steering Pump: Depending on the tractor’s configuration, you may need to remove other components to access the power steering pump. This could include the air intake system, belts, or other accessories obstructing access to the pump.
  4. Remove the Drive Belt: Loosen the tension on the drive belt by loosening the adjustment bolt on the tensioner pulley. Slide the belt off the power steering pump pulley and remove it from the tractor.
  5. Drain Fluid: Place a drain pan underneath the power steering pump to catch any fluid that may leak out during the removal process. Use a fluid pump or siphon to remove as much power steering fluid from the reservoir as possible.
  6. Disconnect Hoses and Lines: Carefully disconnect the hydraulic hoses and lines connected to the power steering pump. Be prepared to catch any fluid that may leak out.
  7. Remove Mounting Bolts: Loosen and remove the mounting bolts securing the power steering pump to the tractor’s engine or mounting bracket. Keep track of the bolts and any associated hardware.
  8. Remove the Pump: Carefully maneuver the power steering pump out of its mounting position. Take care not to damage any surrounding components or hoses.
  9. Install the New Pump: Position the new power steering pump in place and secure it with the mounting bolts. Torque the bolts to the manufacturer’s specifications.
  10. Reconnect Hoses and Lines: Attach the hydraulic hoses and lines to the new power steering pump. Ensure all connections are tight and secure.
  11. Install Drive Belt: Slide the drive belt back onto the power steering pump pulley and tension it according to the manufacturer’s specifications. Tighten the adjustment bolt on the tensioner pulley to secure the belt in place.
  12. Refill Fluid: Refill the power steering fluid reservoir with the appropriate type and amount of fluid recommended by Kubota.
  13. Bleed the System: Start the engine and turn the steering wheel from lock to lock several times to bleed air from the power steering system. Check the fluid level and add more if necessary.
  14. Check for Leaks and Test: Once the system is bled, check for any leaks around the power steering pump and connections. Test the steering operation to ensure proper functionality.
  15. Reassemble: Reinstall any components or accessories that were removed to access the power steering pump. Double-check all connections and fasteners for tightness.

Kubota M125X Cab Lighting

Here’s an overview of the cab lighting options commonly found on the Kubota M125X:

  1. Interior Cab Lights: The tractor’s cab usually includes interior lights positioned strategically to illuminate the operator’s workspace, controls, and instrumentation. These lights are essential for providing visibility inside the cab during early morning, evening, or nighttime operations.
  2. Exterior Work Lights: The M125X often comes equipped with exterior work lights positioned around the tractor to illuminate the surrounding area. These lights are typically mounted on the front and rear of the tractor to provide visibility when operating attachments or implements, such as loaders or mowers, in low-light conditions.
  3. Headlights: The tractor is usually equipped with powerful headlights positioned at the front of the cab to provide forward illumination. These headlights are essential for safe operation when traveling on roads or navigating dark environments.
  4. Tail Lights: Tail lights are commonly found at the rear of the tractor to enhance visibility for other vehicles and equipment operators when traveling on roads or working in low-light conditions.
  5. Turn Signals and Hazard Lights: Many Kubota M125X models feature turn signals and hazard lights to indicate the tractor’s direction of travel and warn others of potential hazards. These lights contribute to safe operation, especially when traveling on public roads or in busy work environments.
  6. Backup Lights: Some models may also include backup lights to improve visibility when reversing or maneuvering the tractor in low-light conditions. These lights enhance safety by helping operators avoid obstacles and hazards behind the tractor.
  7. Optional Lighting Upgrades: Depending on the specific model and optional equipment package, operators may have the option to upgrade the tractor’s lighting system with additional features such as high-intensity discharge (HID) lights or LED lights for improved brightness and energy efficiency.

Kubota M125X Power Steering Fluid

Kubota recommends using a high-quality hydraulic fluid that meets the specifications outlined in the tractor’s operator’s manual. This fluid is often a universal tractor transmission oil (UTTO) or a hydraulic transmission fluid (HTF) that meets the tractor’s specific requirements.

When adding or replacing power steering fluid in the Kubota M125X, follow these general steps:

  1. Check the Manual: Refer to the tractor’s operator’s manual to confirm the recommended type of hydraulic fluid for the power steering system.
  2. Locate the Reservoir: The power steering fluid reservoir is typically located near the power steering pump. It may have a cap or dipstick for checking the fluid level.
  3. Check Fluid Level: Before adding fluid, check the current level using the dipstick or sight glass on the reservoir. Ensure that the fluid level is within the recommended range.
  4. Add Fluid: If the fluid level is low, carefully add the recommended hydraulic fluid to the reservoir. Use a funnel to prevent spills and contamination.
  5. Check for Leaks: After adding fluid, inspect the power steering system for any signs of leaks, such as puddles or drips around hoses, fittings, or the power steering pump.
  6. Bleed the System (if necessary): If the power steering system was opened or drained, it may need to be bled to remove air pockets. Follow the procedure outlined in the operator’s manual to bleed the system properly.
  7. Verify Operation: Start the engine and turn the steering wheel from lock to lock several times to circulate the fluid and ensure proper operation of the power steering system.
  8. Check Fluid Level Again: After operating the tractor, recheck the fluid level in the reservoir and add more fluid if necessary to maintain the proper level.