Your KX080-4 is down and every idle hour costs money, so this OEM manual (#RY911-21600) skips the fluff and goes straight to the machine, boom pin to travel motor. The hydraulic section runs 222 pages: two full circuit diagrams (standard and angle blade spec), dual tandem piston pump horsepower control curves, and teardown procedures for the swivel motor, travel motor, control valve, and every pilot valve. Over 100 electrical pages add troubleshooting trees, 60 error codes with diagnosis steps, ECU wiring routing, and a full-page circuit diagram for fuses, relays, solenoids, and operator controls. Torque the swivel bearing bolts to 259.9-304.0 N·m, the track roller mounting bolts to 166.7-196.1 N·m. Swap the hydraulic return filter at 500 hours, the pilot filter at 1,000. Open the bookmarked PDF on any device and land the factory answer first try.
What's Inside This Kubota KX080-4 Manual
| System | Pages | Key Topics |
|---|---|---|
| I Information | 4-18 | - |
| G General | 19-43 | Contents, Checking Excavator Identification, Engine Identification (Model Name and Serial Number, Cylinder Number) |
| 1 Machine Body | 44-86 | Contents, Front (Boom Assembly/Disassembly, Table of Dimensions, Bucket, Pin, Bushings, Arm, Blade) |
| 2 Engine | 87-92 | General, Specifications, Dimensions, Performance Curves, Fan Drive |
| 3 Hydraulic System | 93-314 | Contents, Diagram of Hydraulic Circuit, Hydraulic Device Layout |
| 4 Electrical System | 315-421 | Contents, Layout of Electrical Devices and Wiring Routing (Precautions on How to Clamp the Electrical Wiring, Precautions on Handling Electrical Connectors) |
| 5 Cabin | 422-486 | Air Conditioning System, Structure, How The Mechanisms Of The System Work, Compressor, Air Conditioning Unit, Condenser, Receiver, Pressure Switch |
| Electrical Circuit Diagram | 487 | Composition Specification Code Notes, Engine Control Unit and Sensors, Relays and Solenoids, Fuses and Power Distribution, Operator Controls and Indicators |
| Connector Chart | 488-490 | Engine Control Unit Connectors, Sensor Connectors, Actuator and Solenoid Connectors, Power Distribution Connectors, Operator Interface Connectors |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Track roller mounting bolts | 166.7 to 196.1 N·m, 17.0 to 20.0 kgf·m, 123.0 to 144.6 lbf·ft | p. 80 |
| Swivel bearing tightening torque | 259.9 to 304.0 N·m, 26.5 to 31.0 kgf·m, 191.7 to 224.2 lbf·ft | p. 68 |
| Hydraulic return filter cartridge replacement interval | replace every 500 hrs | p. 41 |
| Filter in the pilot hydraulic system replacement interval | replace every 1000 hrs | p. 41 |
| Fuel filter cartridge replacement interval | replace every 500 hrs | p. 41 |
| Air filter element Outer element clean interval | clean every 200 hrs | p. 41 |
| Air filter element Outer element replacement interval | replace every 1000 hrs | p. 41 |
| Pilot filter replacement interval | replace every 1000 hrs | p. 41 |
| Track Rollers O.D. (Factory spec) | 132 mm | p. 83 |
| Track Rollers O.D. (Recommended replacement values) | 124 mm | p. 83 |
| Front Idler O.D. (Factory spec) | 390 mm | p. 83 |
| Front Idler O.D. (Recommended replacement values) | 384 mm | p. 83 |
Kubota KX080-4 Common Problems This Manual Covers
Hydraulic power fades while digging and every actuator crawls or stalls on the Kubota KX080-4
Replace the pilot filter every 1000 hours per the schedule on page 41. Hook a pressure gauge to the test port and read the main relief valve setting against page 107. Confirm the unload pressure sits at exactly 2.7 MPa. Adjust the relief valve if it falls short.
Manual Section: 3 Hydraulic SystemTravel function feels weak or track fails to travel right and meanders during heavy operation p. 83
Measure the track rollers' outer diameter against the 132 mm factory spec on page 83. Swap the rollers if they fall below 124 mm. Torque the replacement mounting bolts to 166.7 to 196.1 N·m per page 80 so the track stops binding.
Manual Section: 1 Machine BodyEngine fails to start sometimes or starts with unregistered keys when turning the ignition switch p. 89
Test the ignition circuit and trace the wiring routing with the electrical layout on page 315. Check engine compression pressure and confirm it reaches 3.1 MPa as specified on page 89. Clean every battery terminal and replace any damaged start-up equipment relays.
Manual Section: 4 Electrical SystemCabin air conditioning cooling not working and blower pushes warm air with loud compressor noise p. 446
Inspect the AC compressor magnetic clutch air gap on page 446 and confirm it sits between 0.30 to 0.65 mm. Recover the spent refrigerant and pull a deep vacuum. Recharge with exactly 970 ± 50 g of fresh refrigerant to bring cooling back.
Manual Section: 5 CabinFrequently Asked Questions
How do you reset the Kubota KX080-4 service light?
Open the 'Periodic Check' menu in user settings mode. Once an item is within 10 hours of its check time, press switch 5 to run the check. If 'Periodic Check Selection' is set to Auto, turning the key ON/OFF 10 times completes it instead.
How do you reset the Kubota KX080-4 error code?
Enter the service/dealer mode and select 'Delete Fail Record' to clear past failures. With the record gone, restart the engine and confirm the warning no longer shows on the meter panel.
What does the Kubota KX080-4 oil pressure warning mean?
An oil pressure warning on the meter panel points to one of three things: low engine oil pressure, an oil switch stuck ON, or a short in the harness. Shut the engine down right away and check the oil level and lamp status.
Why does the Kubota KX080-4 engine shut down after a few minutes?
If the PM clog level blinks red at Level 3, the engine is forced to stop after 60 seconds. The fix: turn the accelerator dial to maximum and restart. That blinking points to a DPF issue that needs attention.
What do I get after purchasing this Kubota KX080-4 manual?
Immediate download of the complete 490-page searchable Service Manual. Open it on any device, from the laptop at your desk to the phone in the field.
Is this Kubota KX080-4 Service Manual printable?
Yes. The PDF carries no DRM, so print any page or section you need for the shop. Works with any standard printer.
Does this Kubota KX080-4 Service Manual cover the hydraulic system?
Included. Hydraulic system schematics cover all circuits, control valves, and component specifications for the Kubota KX080-4.
Document Quality
This document is a native digital PDF, allowing you to easily search and copy all text, which is crisp and clear throughout. Diagrams and illustrations are a mix; some are sharp vector images, while others are clear raster images or photos with readable labels. All pages are clean with no notable scan artifacts, stains, or skewed content. You will find a few blank filler pages with only a section title.
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