Kubota RTV 400 Parts and Parts Manual PDF

Kubota RTV 400 Parts

The Kubota RTV 400 is a utility vehicle, powered by a fuel-efficient 16 horsepower, air-cooled, single-cylinder gasoline engine, that delivers exceptional performance on various terrains. With its Continuously Variable Transmission (CVT), the RTV 400 offers smooth acceleration and precise control.

Equipped with selectable 2WD and 4WD, users can adapt to different working conditions, ensuring optimal traction and stability. The vehicle features a compact design, making it agile and manoeuvrable in tight spaces. The independent front and rear suspension contribute to a comfortable ride, absorbing shocks for enhanced operator comfort.

The RTV 400 boasts a sturdy steel cargo bed with a hydraulic lift, enabling a payload capacity of up to 441 lbs (200 kg). The cargo bed tilts for easy dumping of materials, adding practicality to its utility. Additionally, the RTV 400 comes with a standard towing hitch, allowing it to tow up to 1,102 lbs (500 kg), expanding its capabilities.

Kubota RTV 400 Parts – OEM and Aftermarket Parts

The Kubota RTV 400, like any other vehicle, may require replacement parts for maintenance or repairs. Parts can generally be categorized into OEM (Original Equipment Manufacturer) and aftermarket options.

OEM Parts: Original Equipment Manufacturer (OEM) parts are produced by the same company that manufactured the vehicle, in this case, Kubota. These parts are designed to meet the specific standards and quality requirements of Kubota. OEM parts are known for their precision fit and reliability. They are often available through authorized Kubota dealerships and come with a warranty, ensuring compatibility and performance. When using OEM parts, you can expect them to match the original components in terms of quality and specifications.

Aftermarket Parts: Aftermarket parts are produced by third-party manufacturers and are not affiliated with the original vehicle manufacturer. These parts may offer a more cost-effective alternative to OEM parts and are widely available from various suppliers. While some aftermarket parts may meet or exceed OEM standards, it’s crucial to ensure compatibility and quality. Some aftermarket components may vary in terms of fit and performance, so it’s essential to choose reputable suppliers and brands.

When considering replacement parts for your Kubota RTV 400, it’s advisable to weigh the advantages and disadvantages of both OEM and aftermarket options based on.

Kubota RTV 400 Problems

Common problems reported by owners may include:

  1. Transmission Issues: Some users have reported problems with the Continuously Variable Transmission (CVT), such as slipping or difficulty engaging gears. Regular maintenance and proper operation can help prevent transmission issues.
  2. Starting Problems: Users may encounter difficulties starting the engine. This could be due to issues with the ignition system, battery, or fuel system. Regular maintenance, including checking the battery and fuel system, can help prevent starting problems.
  3. Overheating: In certain conditions or due to heavy usage, the RTV 400 may experience overheating. This could be related to cooling system problems, such as a malfunctioning radiator or cooling fan.
  4. Electrical Issues: Users have reported various electrical problems, including issues with lights, gauges, and other electrical components. Inspecting the wiring, connectors, and fuses regularly can help address and prevent electrical problems.
  5. Suspension and Steering Problems: Some users have noted issues with the suspension and steering components. Regular inspections and proper maintenance of these systems can help prevent problems.

Kubota RTV 400 Replacement Engine

When considering a replacement engine, here are some key steps to take:

  1. Consult Kubota Authorized Dealers:
    • Contact Kubota authorized dealers or service centers. They can provide information on the specific engine models compatible with your RTV 400.
  2. Check OEM Options:
    • Explore original equipment manufacturer (OEM) replacement engines provided by Kubota. OEM engines are designed to meet the manufacturer’s specifications, ensuring compatibility and performance.
  3. Verify Model and Specifications:
    • Confirm the exact model and specifications of your RTV 400, as different models or production years may have variations in engine requirements.
  4. Consider Rebuilt or Remanufactured Engines:
    • Rebuilt or remanufactured engines can be cost-effective alternatives. These engines are disassembled, inspected, and rebuilt to meet or exceed OEM specifications.
  5. Explore Aftermarket Options:
    • Some reputable aftermarket manufacturers produce engines compatible with Kubota vehicles. Ensure that the aftermarket engine meets or exceeds the original specifications.
  6. Seek Professional Advice:
    • Consult with a qualified mechanic or Kubota service technician to get recommendations and advice on the best replacement engine for your RTV 400.
  7. Verify Warranty and Quality:
    • If purchasing an aftermarket or rebuilt engine, check for warranties and reviews to ensure the quality and reliability of the replacement.

Kubota RTV 400 Engine Parts

Here’s a list of common engine parts you might need for your RTV 400:
  1. Air Filter: Filters out dust and debris from the air before it enters the engine.
  2. Oil Filter: Removes contaminants from the engine oil to ensure proper lubrication.
  3. Spark Plugs: Ignites the air-fuel mixture in the engine cylinders.
  4. Fuel Filter: Filters impurities from the fuel before it reaches the engine.
  5. Gaskets and Seals: Various gaskets and seals ensure proper sealing and prevent oil or coolant leaks.
  6. Piston Rings: Seals the gap between the piston and cylinder to prevent gas leakage during combustion.
  7. Timing Belt/Chain: Ensures proper timing and synchronization of engine components.
  8. Cylinder Head: Houses the valves, spark plugs, and other components critical to combustion.
  9. Crankshaft: Converts reciprocating motion into rotational motion to drive other engine components.
  10. Camshaft: Controls the opening and closing of engine valves.
  11. Water Pump: Circulates coolant through the engine to regulate temperature.
  12. Thermostat: Regulates the flow of coolant to maintain optimal operating temperature.

Kubota RTV 400 Parts Diagram

Here are a few steps you can take to obtain a parts diagram:

  1. Owner’s Manual: Check the owner’s manual that came with your Kubota RTV 400. It may include an illustrated parts diagram, particularly in the maintenance or parts section.
  2. Service Manual: If you have access to the service manual for the RTV 400, it is likely to contain detailed parts diagrams. Service manuals are often more comprehensive than owner’s manuals and are available from Kubota dealerships or authorized resellers.
  3. Kubota Parts Lookup Website: Kubota provides an online parts lookup tool on their official website. You can enter your RTV 400’s model and serial number to find detailed parts diagrams for various components. Visit the official Kubota parts website or contact a Kubota dealership for assistance.
  4. Authorized Dealership: Reach out to a Kubota authorized dealership. They can often provide you with the necessary diagrams, or they may assist you in obtaining the appropriate documentation.
  5. Online Resources: Some online platforms or forums dedicated to Kubota vehicles may have user-contributed parts diagrams or discussions about obtaining them. However, exercise caution and verify the accuracy of the information.

Kubota RTV 400 Engine Rebuild Kit

If you’re planning to rebuild the engine of your Kubota RTV 400, an engine rebuild kit can be a convenient way to obtain the necessary components.

An engine rebuild kit typically includes essential parts for refreshing the engine and restoring it to optimal condition. Here are common components that may be included in an engine rebuild kit:

  1. Piston Set: Includes pistons, piston rings, and wrist pins.
  2. Gasket Set: Contains gaskets and seals for the cylinder head, valve cover, intake manifold, exhaust manifold, and other critical areas.
  3. Main Bearings and Rod Bearings: Ensure proper support and reduced friction between the crankshaft and connecting rods.
  4. Timing Components: Timing belt or chain, tensioner, and related components to maintain proper synchronization.
  5. Oil Pump: Ensures proper oil circulation and lubrication.
  6. Camshaft Bearings: Support the camshaft and reduce friction.
  7. Thrust Washers: Provide axial support to prevent excessive movement of the crankshaft.
  8. Freeze Plugs: Seals off openings in the engine block to prevent coolant leaks.
  9. Valve Stem Seals: Prevent oil from entering the combustion chamber.

When searching for a Kubota RTV 400 engine rebuild kit, consider the following steps:

  1. Check with Authorized Dealers: Kubota authorized dealerships or parts distributors may offer OEM rebuild kits.
  2. Specialized Suppliers: Explore online platforms and specialized suppliers that focus on engine parts and rebuild kits.
  3. Aftermarket Options: Some aftermarket manufacturers produce quality engine rebuild kits for Kubota vehicles. Ensure that the kit meets or exceeds OEM specifications.
  4. Verify Compatibility: Confirm that the rebuild kit is compatible with the specific model and year of your Kubota RTV 400.

Kubota RTV 400 Windshield

The windshield for a Kubota RTV 400 is a critical component that provides protection from the elements and helps maintain visibility for the driver and passengers. If you need to replace or install a windshield on your Kubota RTV 400, consider the following:
  1. OEM Replacement: Kubota offers original equipment manufacturer (OEM) windshields designed specifically for the RTV 400. These windshields are engineered to fit the vehicle’s dimensions and maintain the manufacturer’s standards.
  2. Aftermarket Windshields: Aftermarket windshields are produced by third-party manufacturers. They may offer alternatives to OEM options, potentially with variations in design or materials. Ensure that the aftermarket windshield is designed for the Kubota RTV 400 and meets safety standards.
  3. Material and Design: Windshields can be made from various materials, including tempered glass or polycarbonate. Consider the material’s durability, impact resistance, and clarity. Some windshields may also feature tinting or coatings to reduce glare.
  4. Installation: Proper installation is crucial for the effectiveness and safety of the windshield. Follow the manufacturer’s guidelines or seek professional installation if needed. Some windshields may come with installation kits, including necessary hardware.
  5. Ventilation Options: Some windshields may have adjustable vents or openings to allow airflow into the cabin. This can be beneficial for comfort, especially in varying weather conditions.
  6. Compatibility: Verify that the windshield is compatible with your specific model and year of the Kubota RTV 400. Dimensions and attachment points may vary between models.
  7. Local Dealerships and Suppliers: Check with Kubota authorized dealerships, local automotive parts stores, or online suppliers specializing in Kubota RTV accessories for windshield options.

Here are some options for windshields for the Kubota RTV 400

Kubota RTV 400 and RTV 500 Full Vented Windshield

Made from 1/4” Clear Polycarbonate Lexan
All clamps and screws are made with no rust stainless steel hardware
Available on Amazon from various sellers

Kubota RTV400/500 Windshields – UTV Parts and Accessories

Offers vinyl windshield/top combo and vinyl windshield/top/rear window combo
Available on utvpartsandaccessories.com

Kubota #77700-V4368 Poly Windshield for RTV-400 RTV-500

Steel framed hard coated poly windshield

Kubota RTV 400 Accessories

Some popular accessories for the Kubota RTV 400 include:

  1. Roof and Windshield Options:
    • Hard or soft roofs provide protection from the sun and rain.
    • Full or half windshields offer protection against wind, dust, and debris.
  2. Winches:
    • Electric or hydraulic winches assist in pulling heavy loads or navigating challenging terrain.
  3. Cargo Boxes and Bed Accessories:
    • Cargo boxes, bed liners, and tool holders add functionality to the vehicle’s cargo bed.
  4. Lighting Accessories:
    • Additional headlights, light bars, or spotlights enhance visibility during low-light conditions.
  5. Cab Enclosures:
    • Enclosures with doors and windows offer protection from the elements, making the RTV suitable for all seasons.
  6. Heating and Cooling Systems:
    • Cab heaters or air conditioning units provide climate control for the cabin.
  7. Snow Plows and Blades:
    • Snow plow attachments are useful for clearing snow during winter months.
  8. Lift Kits:
    • Lift kits can increase ground clearance and improve off-road capabilities.
  9. Tires and Wheels:
    • Upgrading to off-road tires or custom wheels can enhance traction and aesthetics.
  10. Suspension Components:
    • Heavy-duty shocks or suspension kits improve ride comfort and handling.
  11. Mirrors:
    • Additional rearview or side mirrors can improve visibility.
  12. Stereo Systems:
    • Audio systems with speakers or Bluetooth connectivity provide entertainment while on the go.
  13. Seat Covers:
    • Durable seat covers protect the vehicle’s seats from wear and tear.
  14. GPS and Navigation Systems:
    • Navigation units can be added for users navigating unfamiliar terrain.

Kubota RTV 400 Battery Size

The battery size for the Kubota RTV 400 can vary based on the specific model and year. The battery specifications typically include information such as voltage, capacity (ampere-hours or Ah), and dimensions.

To determine the correct battery size for your Kubota RTV 400, you should consult the owner’s manual or check the existing battery for the following information:

  1. Voltage: The voltage rating of the battery, often expressed in volts (V), is a crucial factor. The Kubota RTV 400 likely uses a 12-volt electrical system, but it’s essential to confirm this.
  2. Capacity (Ah): The battery capacity, measured in ampere-hours (Ah), indicates how much charge the battery can store. Common capacities for RTVs may range from 30Ah to 50Ah, but it’s essential to verify the specific requirements for your model.
  3. Dimensions: The physical size of the battery, including length, width, and height, should match the available space in the battery compartment of your RTV 400.

Kubota RTV 400 Starter Removal

Before you begin, make sure to disconnect the battery to ensure safety.

Tools and Materials:

  • Socket and wrench set
  • Screwdriver
  • Pliers
  • Torque wrench


  1. Disconnect the Battery:
    • Locate the battery in your Kubota RTV 400 and disconnect the negative terminal to ensure safety during the process.
  2. Locate the Starter:
    • Identify the location of the starter motor. It is typically mounted on the engine and connected to the transmission or bell housing.
  3. Remove Electrical Connections:
    • Disconnect the electrical connections to the starter. There should be a large cable (positive) connected to the starter solenoid and a smaller wire for the ignition switch. Use pliers or a wrench to remove the nuts or bolts securing these connections.
  4. Remove Mounting Bolts:
    • Locate the bolts securing the starter to the engine. There are typically two or more bolts holding the starter in place. Use a socket and wrench to remove these bolts.
  5. Support the Starter:
    • Once the bolts are removed, support the weight of the starter with one hand while removing the last bolt with the other. This prevents the starter from falling and causing damage.
  6. Remove the Starter:
    • Carefully pull the starter away from the engine. You may need to wiggle it slightly to release it from the mounting area.
  7. Inspect and Replace:
    • Before installing a new starter or performing any repairs, inspect the removed starter for any visible damage or issues. If you are replacing the starter, install the new one by reversing the steps above.
  8. Torque the Bolts:
    • When installing the new starter or reattaching the existing one, use a torque wrench to tighten the mounting bolts to the specified torque values. Refer to your Kubota RTV 400 service manual for the correct torque specifications.
  9. Reconnect Electrical Connections:
    • Reconnect the electrical wires to the starter solenoid. Ensure that all connections are secure.
  10. Reconnect the Battery:
    • Finally, reconnect the negative terminal of the battery.

Kubota RTv 400 Oil Filter

The Kubota RTV 400 uses the Kubota Genuine Oil Filter W21ESO1500. This is the recommended filter for optimal performance and engine protection. However, there are also compatible aftermarket options available that might be more budget-friendly.

Here are some options for your Kubota RTV 400 oil filter:

Genuine Kubota:

  • Kubota Genuine Oil Filter W21ESO1500: This is the OEM filter, guaranteeing compatibility and performance as intended by Kubota. You can find it at Kubota dealerships or online retailers authorized by Kubota.
  • Kubota Engine Service Kit: This kit often includes the oil filter along with other maintenance items like air filters and fuel filters. It can be a cost-effective option if you plan to replace other filters as well.

Compatible Aftermarket:

  • RAParts New Aftermarket Oil Filter (Fits Kubota RTV400, RTV500, RTV900, RTV900XT): This is a popular aftermarket option known for its affordability and compatibility with various Kubota models.
  • Generic Oil Filter: You might find generic oil filters compatible with the RTV 400 at auto parts stores, but always double-check compatibility and filter specifications before using them.

Important things to consider when choosing an oil filter:

  • Compatibility: Ensure the filter fits your specific RTV 400 model year. Refer to your owner’s manual or consult a trusted mechanic for verification.
  • Filter quality: Choose a reputable brand for quality materials and proper filtration performance.
  • Micron rating: Select a filter with an appropriate micron rating to effectively capture contaminants in your engine oil.
  • Price: Balance affordability with quality and ensure the filter meets your requirements.

Additional tips:

  • Replace your oil filter at the recommended intervals specified in your owner’s manual.
  • Use the correct engine oil viscosity grade recommended by Kubota for your RTV 400.
  • Dispose of used oil filters responsibly at designated recycling facilities.