Kubota offers an extensive product range, primarily including excavators, tractors, skid-steer loaders, wheel loaders, engines, and agricultural machinery.
When purchasing Kubota parts, a common question is: are parts interchangeable between different series of equipment?
This article covers common Kubota parts and replacement parts, signs of malfunction, how to look up part numbers, and how to select the right aftermarket replacement parts.
What series does Kubota offer?
KX Series
Common Models: KX018, KX027, KX030, KX040, KX057, KX080, KX085.
Features: Standard small crawler excavators with a wide range of applications.
U Series
Common Models：U10、U17、U20、U27、U30、U35、U40、U48、U55
Features: Compact excavators; some models feature a zero-tail swing design.
K Series
Common Models：K008 ,etc.
Features: Ultra-compact excavators, suitable for construction in confined spaces.
SVL Series
Common Models：SVL65、SVL75、SVL90、SVL95、SVL97、SVL110.
SSV Series
Common Models：SSV65、SSV75
R Series
Common Models：R430、R540、R640
In addition, Kubota also offers a range of tractors and engines.
Key Replacement Parts for Excavators.
Kubota compact excavators consist of various mechanical and hydraulic systems that work in tandem.
The following are some of the most common product categories encountered during maintenance and the procurement of spare parts.
Hydraulic Pump
The hydraulic pump converts the mechanical energy supplied by the engine into hydraulic energy, providing power to the excavator’s working equipment and travel system.
Different Kubota models use hydraulic pumps with varying displacements, control methods, and mounting configurations.
Common fault symptoms:
- Slow hydraulic operation.
- Lack of power when raising the boom or bucket.
- Abnormal pressure in the hydraulic system.
- Abnormal noise from the hydraulic pump.
- Excessively high hydraulic oil temperature.
- Leakage from the hydraulic pump.
Travel Motor
The travel motor is a key component of the travel system in Kubota crawler excavators.It converts hydraulic energy into rotational mechanical power to drive the tracks.
Common fault symptoms:
- Abnormal movement on one side of the track.
- The left and right tracks are moving at different speeds.
- Unusual noise occurs during travel.
- Oil is leaking from the travel motor.
- The machine’s ability to climb slopes has decreased.
Final Drive
The final drive reduces rotational speed and increases output torque through a reduction gear mechanism, enabling the excavator to drive its tracks.
Common internal parts:
- Planetary Gear
- Sun Gear
- Ring Gear
- Bearings
- Oil Seals
Common fault symptoms:
- Gear wear
- Bearing failure
- Gearbox leak
- Abnormal noise
Swing Motor
The swing motor drives the rotation of the excavator’s upper structure.
If the machine experiences slow rotation, weak rotation, or abnormal noise, inspect the swing motor, swing gearbox, and related hydraulic control systems.
Hydraulic Cylinder
The hydraulic cylinders are responsible for driving the excavator’s working equipment to perform various movements.
Kubota compact excavators typically include the following hydraulic cylinders:
- Boom Cylinder
- Arm Cylinder
- Bucket Cylinder
- Blade Cylinder
Common fault symptoms:
- Scratches on the piston rod
- Worn seals
- External oil leaks
- Internal leaks
Hydraulic Seal Kit
Seals are common consumable parts in the maintenance of Kubota excavators.
Common products include:
- Piston Seal
- Rod Seal
- Dust Seal
- O-Ring
- Backup Ring
- Wear Ring
Kubota Engine Parts
Kubota not only manufactures excavators but also produces diesel engines widely used in construction machinery.
Some of Kubota’s compact excavators are equipped with Kubota’s own engines.
Common engine repair parts include:
- Fuel Injector
- Fuel Injection Pump
- Water Pump
- Starter Motor
- Alternator
- Oil Filter
- Fuel Filter
- Air Filter
- Gasket Kit
Before purchasing engine parts, check the engine nameplate to verify the complete model number and serial number.
Common Faults and Corresponding Parts for Kubota.
The following table can help equipment maintenance technicians make an initial assessment of which systems need to be inspected.
| Symptoms | Possible Affected Components or Systems |
|---|---|
| Slow Hydraulic Operation | Hydraulic pump, control valve, hydraulic oil supply system |
| Weak Boom Lifting Performance | Hydraulic cylinder, control valve, hydraulic pump |
| Abnormal Travel on One Side | Travel motor, hydraulic control circuit, final drive |
| Hydraulic Oil Overheating | Cooling system, hydraulic pump, internal hydraulic leakage |
| Hydraulic Cylinder Leakage | Piston rod seals, cylinder seal kit |
| Abnormal Swing Operation | Swing motor, swing gearbox, hydraulic control system |
| Abnormal Travel Noise | Travel motor, final drive, bearings, gears |
| Engine Starting Problems | Starter motor, fuel injection system, battery, electrical connections |
These are common troubleshooting approaches; they do not imply that every symptom corresponds to a specific faulty part. The cause of the malfunction should be determined by referring to the equipment maintenance manual and the test results.
How to Find Part Numbers for Kubota Parts？
If you need to purchase the correct replacement parts for a Kubota excavator, it is recommended that you follow these steps to look them up.
Step 1: Identify the Excavator Model
Confirm the complete equipment model number.
For example:Kubota KX057-5/Kubota U17-3
Step 2: Check the Machine Serial Number
The equipment serial number helps identify the production batch and specific configuration.
Step 3: Use the Kubota Parts Lookup
Kubota provides an official online parts lookup system:Kubota parts
Step 4: Check the Original Part Number
If the old part has a nameplate or serial number, take a clear photograph of it.
Step 5: Verify Replacement Compatibility
How to Choose Between Original Kubota Parts and Aftermarket Replacement Parts?
Original Parts vs. Aftermarket Parts
| Comparison Factors | Genuine Excavator Parts | Aftermarket Excavator Parts |
|---|---|---|
| 1. Price | Usually more expensive. | Generally more cost-effective, with more competitive pricing. |
| 2. Quality | Manufactured according to the original manufacturer’s specifications and quality standards. | Quality varies depending on the manufacturer and production standards. |
| 3. Materials | Materials are selected according to original design requirements. | Material quality may vary between suppliers. |
| 4. Dimensional Accuracy | Manufactured according to original design specifications. | Depends on machining precision and quality control. |
| 5. Compatibility | Generally designed to match specific original equipment models. | Compatibility should be verified by part number, dimensions, and specifications. |
| 6. Service Life | Depends on operating conditions and maintenance. | Depends on product quality, operating conditions, and maintenance. |
| 7. Warranty | Covered by the original manufacturer’s warranty policy. | Warranty is provided according to the supplier’s or manufacturer’s policy. |
| 8. Delivery Time | Some genuine parts may require longer ordering and delivery times. | Some aftermarket parts may be more readily available from suppliers. |
| 9. Brand | Supplied under the original equipment manufacturer’s brand. | Produced by independent manufacturers or aftermarket brands. |
| 10. After-Sales Service | Support is generally provided through authorized dealers or the original manufacturer. | Support is provided by the aftermarket parts supplier or manufacturer. |
Both original and aftermarket excavator parts have their own advantages. Original parts offer original manufacturer specifications and brand assurance, while aftermarket parts provide more competitive pricing and flexible purchasing options. The best choice depends on your budget, equipment requirements, operating conditions, and the reliability of the supplier.
Common Mistakes When Purchasing Kubota Parts.
If the tonnage is similar, it is assumed that Kubota parts are interchangeable.
Kubota compact excavators vary in structure and accessory configurations depending on the model, so parts may not be interchangeable.
Ignoring the Equipment Serial Number
For example, providing only the model name—such as KX040 or U35—may not allow for accurate identification of parts.
Confusing the Travel Motor and Final Drive
The Travel Motor and Final Drive Gearbox are distinct functional components.
You must specify whether you need to purchase a hydraulic motor, a reduction gearbox, or a complete assembly.
If you would like to learn about the detailed differences between the two, you can refer to this guide.“Excavator Final Drive vs. Travel Motor”.
Ignoring the Specific Engine Model
Engine parts must be selected based on the actual engine model.
FAQ
How do I find the correct Kubota part number?
Use the machine model and serial number to search the official Kubota Parts Lookup system. You can also check the original part number on the old component and compare it with the applicable parts catalog.
Are Kubota KX and U series parts interchangeable?
Not necessarily. Compatibility depends on the specific component, machine configuration, production year, and serial number range.
What are the most common Kubota excavator replacement parts?
Common replacement parts include hydraulic pumps, travel motors, final drives, swing motors, hydraulic cylinders, seal kits, filters, starter motors, and alternators.
Conclusion
Before purchasing Kubota parts, prepare the complete machine model, serial number, original part number, and component photos.
For hydraulic pumps, travel motors, final drives, and cylinder seal kits, always verify the technical specifications and compatibility before ordering.
FarinParts provides sourcing support for excavator hydraulic components and replacement parts. If you need Kubota parts, submit your machine information and old component photos to help identify suitable replacement options.
Farin
Kingsley
Hi, I’m Kingsley, the author of this post. With over 30 years of experience in manufacturing and supplying excavator parts, we serve customers in more than 50 countries. We provide reliable, high-quality components for construction, mining, agriculture, and heavy equipment applications. If you need durable excavator parts or a free quote, feel free to contact us.
