Part of the Kubota Repair Manuals.
This is the Kubota factory Service Manual for the KX080-4 compact excavator, built around the V3307-CRS-T4 diesel engine. It runs 490 pages and is organized into General, Mechanism, and Servicing coverage, with detailed bookmarks for fast navigation.The manual works through machine-body and undercarriage service, the engine, the full hydraulic system including pumps, control valve, swivel and travel motors, cylinders, and pilot valves, the electrical system, and the cabin with its air conditioning. It closes with the electrical circuit diagram and a connector chart for wiring work.Use it to trace overheating and hydraulic power loss during digging, weak or jerky travel, a boom or bucket that drifts, engine stalling under load, or electrical warning lights, using factory troubleshooting, performance standards, and tightening torques. It is delivered as a downloadable, printable PDF you can keep in the cab or on the bench.
What's Inside This Kubota KX080-4 Manual
| System | Pages | Key Topics |
|---|---|---|
| I Information | - | - |
| G General | - | Contents, Checking Excavator Identification, Engine Identification (Model Name and Serial Number, Cylinder Number) |
| Machine Body | - | Contents, Front (Boom Assembly/Disassembly, Table of Dimensions, Bucket, Pin, Bushings, Arm, Blade) |
| Engine | - | General, Specifications, Dimensions, Performance Curves, Fan Drive |
| Hydraulic System | - | Contents, Diagram of Hydraulic Circuit, Hydraulic Device Layout |
| Electrical System | - | Contents, Layout of Electrical Devices and Wiring Routing (Precautions on How to Clamp the Electrical Wiring, Precautions on Handling Electrical Connectors) |
| Cabin | - | Air Conditioning System, Structure, How the Mechanisms of the System Work, Compressor, Air Conditioning Unit, Condenser, Receiver, Pressure Switch |
| Electrical Circuit Diagram | - | Composition Specification Code Notes, Engine Control Unit and Sensors, Relays and Solenoids, Fuses and Power Distribution, Operator Controls and Indicators |
| Connector Chart | - | 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
Overheating or hydraulic power loss when digging
The excavator can overheat or lose hydraulic power during digging and swinging from low fluid, a clogged filter, cooling restriction, or pump wear. The Hydraulic System section provides the circuit diagrams, performance standards, and troubleshooting.
Manual Section: 3 Hydraulic System p. 93Boom, arm, or bucket drifts
A boom, arm, or bucket that drifts or will not hold a load usually means cylinder seal leakage or control-valve internal leakage. The Hydraulic System section covers cylinder and control-valve service.
Manual Section: 3 Hydraulic System p. 93Worn track rollers and idlers
Undercarriage wear on the rollers and idlers shows up as tracking problems and rough travel. The Machine Body section covers the track frame, rollers, and their factory and replacement dimensions.
Manual Section: 1 Machine Body p. 44Engine starts but stalls under load
Stalling or poor running under load points to fuel restriction, air in the fuel system, or a clogged filter. The Engine section covers the engine specifications, performance curves, and related service.
Manual Section: 2 Engine p. 87Warning lights or unexpected shutdown
Electrical warning lights or an unexpected shutdown can come from a sensor, wiring, or solenoid fault needing diagnosis. The Electrical System section covers the device layout, meter panel, inspections, and troubleshooting.
Manual Section: 4 Electrical System p. 315Cab air conditioning not cooling
Weak cooling or an AC fault in the cab traces to the compressor clutch, refrigerant charge, or the AC circuit. The Cabin section covers the air conditioning system and its service and charging procedures.
Manual Section: 5 Cabin p. 422Frequently Asked Questions
Which machine does this manual cover?
It covers the Kubota KX080-4 compact excavator, built around the V3307-CRS-T4 diesel engine, and applies to the KX080-4A and KX080-4A2 variants.
Does it include wiring diagrams?
Yes. The Electrical System section covers the device layout and wiring routing, and the manual closes with the electrical circuit diagram and a connector chart. p. 315
Where do I find torque specifications?
The General section lists the general tightening torques, and the Machine Body section adds undercarriage values such as the track roller and swivel bearing bolt torques. p. 19
Does it cover hydraulic troubleshooting?
Yes. The Hydraulic System section is the largest in the manual, with the circuit diagrams, device layout, performance standards, and a full troubleshooting chapter. p. 93
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.
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