Overview
The Kubota KX080-3 Excavator Workshop Service Manual provides technical documentation for inspecting, maintaining, troubleshooting and repairing the Kubota KX080-3 compact excavator. The workshop reference covers machine identification, safety precautions, front attachments, undercarriage, engine systems, hydraulic components, electrical controls, air conditioning and the anti-theft system. Separate mechanism and servicing sections provide component specifications, operating principles, diagnostic procedures, adjustments, disassembly and reassembly information.
The documentation includes load-sensing hydraulic pump operation, horsepower control, main and pilot valve circuits, swivel and travel motor servicing, auxiliary service-port flow adjustment and hydraulic pressure testing. Electrical coverage addresses the Kubota Intelligent Control System (KICS), Auto Idling, finger-operated auxiliary controls, sensor diagnostics and wiring harness installation. Additional chapters provide engine workshop information, air-conditioning service procedures and security-key registration references, with European and PP configurations distinguished where applicable.
Safety: Review the general servicing, disassembly and reassembly precautions before beginning workshop operations. The documentation identifies critical safety and functional processes, hydraulic hose and fitting precautions, and post-reassembly inspections. Follow the specified procedures when working with pressurized hydraulic components, suspended attachments and refrigerant equipment.
Important Information: Hydraulic diagrams and maintenance requirements distinguish European and PP machine versions. The travel motor section identifies GM10VA service information from serial number 10410 onward. The anti-theft chapter describes registered security keys and associated electronic diagnostics. Verify the machine identification, serial number and installed equipment before selecting the applicable instructions.
Table of Contents
Kubota KX080-3 Manual
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01. General Information, Safety and Maintenance
- Machine Body and Engine Identification Marks
- Workshop Safety Precautions Before Starting Work
- Safety Measures During Servicing and Disassembly
- Preparation for Component Disassembly
- Important Safety Processes and Critical Functional Procedures
- Essential Adhesives and Assembly Requirements
- Post-Reassembly Noise and Vibration Inspection
- Safety Decal and Wiring Harness Clamp Inspection
- Hydraulic Oil Level Checks After Reassembly
- Service Fundamentals — O-Rings, Oil Seals, Circlips and Roll Pins
- Hydraulic Piping, Hose Connections and Fitting Precautions
- Hydraulic Hose Clamp and Joint Tightening Torques
- Fastener Types, Materials and General Tightening Torques
- Maintenance Intervals — European Version
- Maintenance Intervals — PP Version
- Water and Oil Filling Quantities
- Recommended Oils and Lubricants
- Periodic Replacement of Important Components
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02. Machine Body — Mechanism and Servicing
- KX080-3 Machine Features and Technical Improvements
- Machine Performance, Durability and Serviceability Features
- Maintenance Component Locations
- Rubber Track and Steel Track Differences
- Front Attachment and Undercarriage Greasing Intervals
- Machine Weight and Major Technical Specifications
- Control Lever Stroke and Operating Force Specifications
- Component Dimensions and Quality Specifications
- Front Attachment Removal and Reassembly
- Grease Nipple Installation
- Front Attachment Pin and Bushing Installation
- Bushing Press-Fitting and Shim Installation
- Operator Control Lever Installation
- Travel Lever and Dozer Lever Assemblies
- Cab and Bonnet Removal and Installation
- Sound Absorber and Insulator Components
- Counterweight Installation
- Cover Clearances and Machine Labels
- Swivel Bearing Servicing
- Undercarriage Component Removal and Reassembly
- Track Tension Adjustment
- Swivel Frame and Track Frame Components
- Rubber-to-Steel Track Conversion Kit Instructions
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03. Engine — Mechanism and Workshop Servicing
- Engine Technical Specifications
- Engine Performance Curves
- Engine Installation Differences from the Basic V3800 Configuration
- Starter Motor and Oil Filter Installation Arrangements
- Engine Troubleshooting and Service Specifications
- Hydraulic Pump Coupling Removal and Installation
- Radiator and Cooling Component Servicing
- Air Cleaner and Muffler Installation
- Fuel Tank and Fuel Hose Removal
- Compressor and Control Cable Installation
- Fan Belt and Engine Stop Lever Servicing
- Engine Bracket and Engine Assembly Removal
- Engine Identification and Maintenance Instructions
- Engine Special Service Tools
- Engine Body Construction and Operating Principles
- Engine Lubrication and Cooling Systems
- Engine Fuel System
- Turbocharger and Intake System
- Engine Troubleshooting, Tightening Torques and Service Specifications
- Internal Engine Checking, Disassembly and Servicing
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04. Hydraulic System — Mechanism, Testing and Repair
- Hydraulic System Features and Main Component Specifications
- Hydraulic Component Layouts
- Hydraulic Circuit Diagrams — European and PP Versions
- Main Hydraulic Pump Structure and Operation
- Load-Sensing (LS) Pump Control
- Hydraulic Pump Horsepower Control
- Pump Swashplate Control Mechanism
- Main Control Valve Structure and Component Sections
- Boom, Arm, Bucket, Swing and Dozer Control Valve Sections
- Travel Independent Valve and Travel Selector Valve
- Arm Regeneration Hydraulic Circuit
- P1, P2 and P3 Hydraulic Inlet and Confluence Circuits
- P3 Bypass Circuit and LS Bleed Function
- High-Pressure Selection and Auto Idling Signal Circuits
- S/P2 Mechanical Hydraulic Flow Adjustment
- Travel Pilot Valve with Damper
- Pilot Reducing Valve, Shuttle Valve and Damping Mechanism
- Left and Right Control Lever Pilot Valves
- Swing and Dozer Pilot Valves
- Swivel Motor Structure and Reduction Gear Case
- Swivel Motor Negative Brake and Brake Release Functions
- Swivel Motor Parking Brake and Hydraulic Timer
- Anti-Swivel-Back Shock-Absorbing Valve
- Swivel Motor High-Pressure Selector Valve
- GM10VA Travel Motor — Serial Number 10410 and Later
- Travel Motor Construction and Specifications
- Boom Cylinder Pilot-Line Shockless Valve
- Boom Cylinder Holding Valve and Hydraulic Circuit
- Boom Holding Valve Manual Release and Relief Functions
- S/P1 Proportional Solenoid Valve
- S/P2 Solenoid Valve
- Pilot System Unload and Change Valves
- Hydraulic Accumulator and Two Pattern Selection System (TPSS)
- Hydraulic Suction, Return and Pilot Filters
- Hydraulic Oil Tank and Oil Cooler
- Hydraulic Troubleshooting — Abnormal Speed and Weak Power
- Load-Sensing Control System Troubleshooting
- Hydraulic Pump and Control Valve Fault Diagnosis
- Travel Motor Troubleshooting
- Hydraulic Pump and Relief Valve Specifications
- Swivel, Travel and Hydraulic Cylinder Performance Specifications
- Hydraulic Testing Instruments and Special Tools
- Pilot Pressure and Main Relief Valve Testing
- Travel Relief, Unload and Overload Relief Valve Testing
- Swivel Brake Valve Pressure Testing
- Main Pump Maximum and Standby Flow Measurement
- Load-Sensing Control Pressure Testing
- Travel and Swivel Motor Drain Flow Measurement
- Travel and Swivel Motor Block Performance Testing
- Hydraulic Operating Speed Testing
- Main Pump and Gear Pump Disassembly and Reassembly
- Main Control Valve and Pilot Valve Disassembly
- Dozer, Swing and Travel Pilot Valve Servicing
- Swivel Motor and Travel Motor Disassembly and Reassembly
- Rotary Joint and Boom Holding Valve Servicing
- Hydraulic Tank, Filter and Unload Valve Servicing
- S/P1, S/P2 and TPSS Valve Servicing
- Hydraulic Cylinder Disassembly and Reassembly
- Hydraulic Hose Routing and Connection References
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05. Electrical System — KICS, Auxiliary Controls and Diagnostics
- KX080-3 Electrical System Features and Functions
- S/P1 Auxiliary Service-Port Speed Limiting Control
- S/P1 Limited Hydraulic Flow Settings
- One-Way and Two-Way Auxiliary Hydraulic Control Circuits
- Second Service-Port Operation
- Fuel Supply Pump Electrical Controls
- Intake Air Heater Control System
- Boom Cylinder Overload Sensing
- Travel Alarm System
- Electrical Component Locations and Circuit Diagrams
- Electrical Wiring Diagrams and Service Mode Flowcharts
- Finger-Controlled Auxiliary Service-Port System
- Auxiliary Control Knob and Service-Port Switch Functions
- Service-Port Proportional Solenoid Valve
- Service-Port Knob Initial Setup and Adjustment
- S/P Valve Start-Point Setting
- Auxiliary Control Flow and Output Current Characteristics
- Service-Port Operating Response Adjustment
- Finger-Control Service-Port Troubleshooting
- Kubota Intelligent Control System (KICS)
- KICS Digital Meter and Operating Modes
- KICS Service Mode Menus
- Auto Idling (AI) Control System
- KICS Electrical Component Functions
- Controller Failure Diagnosis and Service Mode Flowcharts
- Electrical Troubleshooting and Diagnostic Flowcharts
- Electrical Wiring Harness Installation Precautions
- Engine Grounding, Starter Switch and Battery Connections
- Electrical Wiring and Connector Inspection
- Main Wiring Harness Routing
- Operator Seat and Front Electrical Component Installation
- Fuel Tank and Engine Room Wiring
- Starter, Alternator, Battery and Fuse Installation
- Hydraulic Solenoid Valve Wiring
- Air Conditioner Electrical Wiring
- Cab Wiring Harness and Circuit Diagram
- Electrical Relay and Travel Alarm Kit Installation
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06. Air Conditioning — Mechanism and Servicing
- Air Conditioning System Construction and Operation
- Refrigerant Cycle and Air Conditioning Principles
- KX080-3 Air Conditioning Component Locations
- Climate Control Panel and Air Conditioner Unit
- SV07 Sliding-Vane Compressor Construction
- Compressor Specifications and Operating Functions
- Compressor High-Pressure Relief Valve
- Compressor Magnetic Clutch
- Condenser and Refrigerant Receiver
- Dual-Pressure Switch and Pressure Protection Functions
- Expansion Valve and Evaporator
- Heater Core and Water Valve
- Air Conditioning Blower Motor and Resistor
- Air Conditioning Electrical Relays
- Air Conditioner Frost Control — KX080-3
- KX080-3 Air Conditioning Electrical Circuit Diagram
- Air Conditioning Service and Performance Specifications
- Refrigerant Pressure Ranges and Adjustment Data
- Air Conditioning Tightening Torques
- Air Conditioner Maintenance Intervals
- Air Conditioning Troubleshooting Procedures
- Refrigerant Pipe Connections and O-Ring Replacement
- Compressor Oil Replenishment During Component Replacement
- Refrigerant Charge Quantity Inspection
- Manifold Gauge Pressure Checks
- Refrigerant Leak Detection and System Performance Testing
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07. Anti-Theft System and Security Key Diagnostics
- Kubota Anti-Theft System Overview
- Kubota Security Key System Structure
- Anti-Theft System Operating Principles
- Black Security Key Functions
- Red Security Key Functions
- Registered and Unregistered Key Meter Panel Displays
- Black Key Registration References
- Anti-Theft Service Mode and Tester Menu
- Anti-Theft Service Mode Flowchart
- KX080-3 Anti-Theft Electrical Circuit Diagram
- KX080-3 Anti-Theft Wiring Diagram
- KICS Anti-Theft Messages and Fault Diagnosis
- Anti-Theft Troubleshooting Flowchart
- Security Key Handling Precautions
- Engine Starting with a Registered Security Key
- Security Key Registration and Function Testing
- Anti-Theft System Structural and Technical References
- 08. Conversion Tables
Load-Sensing Hydraulics, Auxiliary-Port Calibration and Security Controls
The KX080-3 hydraulic system uses detailed load-sensing and horsepower-control references for the main pump, together with separate P1, P2 and P3 control-valve circuits. The workshop procedures include maximum and standby pump flow measurements, load-sensing pressure checks, motor drain testing and hydraulic component disassembly. The travel motor documentation identifies GM10VA information beginning at serial number 10410, making the applicable component and machine identification important when selecting service instructions.
The electrical chapters provide additional coverage of finger-operated auxiliary hydraulic controls, including S/P1 and S/P2 functions, proportional solenoid valves, service-port flow settings and initial calibration. The Kubota Intelligent Control System supplies operating and service modes for electronic diagnostics, while the separate Anti-Theft System chapter documents security keys, registration references, meter-panel indications and system testing. These functions should be serviced according to the relevant configuration and documented procedures.
Air-conditioning servicing is organized separately from the main electrical system. Its chapter includes compressor and magnetic-clutch construction, refrigerant pressure checks, component testing and refrigerant-circuit inspection. Use the specified refrigerant and service requirements for the installed system when performing cabin climate-control repairs.
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