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Kubota KX080-3 Excavator Workshop Repair Manual

Kubota KX080-3 Excavator Workshop Repair Manual

$33.00

🚜 Equipment
Brand	Kubota
Type	Excavator
Model	KX080-3
📄 Documents
Type	Repair Manual
Publication	97899-61620
Language	English
Format	PDF
No of Pages	758

The Kubota KX080-3 Mini Excavator is a powerful and versatile machine engineered for mid-size excavation projects that demand strength, efficiency, and advanced operator features. Built with a Kubota V3307DI-T diesel engine producing approximately 64 horsepower, the KX080-3 delivers excellent digging performance and fuel efficiency while meeting stringent Tier 4 emissions standards. With an operating weight of around 8.2 tonnes and a maximum digging depth of 4,290 mm, this excavator provides the lifting capacity, reach, and breakout force needed for demanding applications in construction, utilities, and site development.

The KX080-3 incorporates a load-sensing hydraulic system with a variable 3-pump configuration, ensuring smooth, responsive control and efficient power distribution across attachments and digging functions. A bucket breakout force of over 14,600 lbs and arm forces exceeding 6,500 lbs highlight its capability in tough digging and lifting conditions. Operator comfort is emphasized through a spacious cab with climate control, ergonomically designed controls, and ROPS/TOPS safety compliance. Compact tail swing design improves maneuverability in confined workspaces, while features like auxiliary hydraulic flow adjustment and dozer blade options add versatility for multiple job requirements.

The workshop repair manual provides full technical coverage of the KX080-3, including detailed sections on the machine body, engine servicing, hydraulic circuits, swing and travel motors, electrical systems, anti-theft system, and air conditioning unit. It includes wiring and hydraulic schematics, troubleshooting flowcharts, torque specifications, lubrication intervals, and detailed disassembly/reassembly procedures. This ensures precise diagnostics and professional-level repairs, enabling owners and technicians to maintain peak machine performance and extend service life.

Key Highlights

Kubota V3307DI-T diesel engine, ~64 hp gross output
Operating weight ~8,170 kg (~18,000 lbs)
Maximum digging depth ~4,290 mm (15 ft 1 in)
Bucket breakout force ~6,650 kgf (~14,650 lbs)
Load-sensing 3-pump hydraulic system with variable auxiliary flow
Compact tail swing design for better maneuverability in confined spaces
Operator-focused cab with ROPS/TOPS, ergonomic controls, and climate control
Workshop manual covers engine, hydraulics, electrical, travel/swing motors, anti-theft and A/C systems
Includes wiring/hydraulic schematics, torque specifications, lubrication charts, and troubleshooting guides
Designed for durability, easy maintenance, and reliable long-term operation

Table of Content

📙 Table of Contents

Cover

Cover

Contents

CONTENTS

I General

I General
- A. Body and engine identification marks
- B. Safety precautions for servicing, disassembly and reassembly
  - a. Safety measures before starting work
  - b. Safety measures during work
  - c. Preparation for disassembly
- C. IMPORTANT SAFETY PROCESS AND CRITICAL FUNCTIONAL PROCESS
  - a. Essential Adhesives
  - b. Important Safety Process .
  - c. Important Critical Functional Process .
- D. IMPORTANT INSPECTION ITEMS AFTER REASSEMBLING
  - a Operate the Machine and check for Unusual Noise and Vibrations.
  - b Make Sure the Safety decals and Wireharness Clamps are in their Specified Positions.
  - c With the Machine Front in a Specified Posture, Check the Amount of Hydrauric Oil
- E. SERVICING FUNDAMENTALS
  - a. Items for Servicing
  - b. O-ring, Oil seal, Circlip and Roll Pin
  - c. Piping
    - (1) General precautions
    - (2) Hydraulic hose
    - (3) Precautions in tightening the bolts and nuts
    - (4) Hose screw
    - Metric Size Hose
    - (5) Joint bodies
    - (6) Hose clamp (screw-in type) tightening torque chart
    - (7) Nuts for piping
    - (8) Tightening torque of bolts and nuts
    - (9) Types and materials of bolts and nuts
    - (10) Washer-equipped elbow
- F. Maintenance intervals
  - a. Maintenance intervals chart : EU-version
  - b. Maintenance interval chart : PP-version
  - c. Water and oil quantity
  - d. Recommended oil
  - f. Periodic replacement of important parts

Ii. Machine Body

II. Machine Body
- chapter2_Mechanism
  - A. New Product Feature
    - a. Feature, quick chart
    - b. Feature points
      - 1. Performance
      - 2. Durability and service ability
      - 3. Safety
  - B. Maintenence components layout
  - C. Rubber track vs Iron track
  - D. Greasing intervals
- chapter2_Service
  - A.Specifications
    - a. Machine weight
    - b. Major specifications
    - c. Lever stroke and operating force
    - d. Dimensions of parts
    - e. Quality specification
  - B: Removing and reassembling
    - a. Front attachment removing
    - b. Grease nipple set up
    - C. Pin and bushing installation
    - d.Shim installation
    - e.Fitting the control lever
    - f.Travel levers
    - g.Dozer lever
    - h.Cab
    - i.Bonnet
    - J.Sound absorber and insulator
    - k. Counterweigt
    - l. Clearances of cover
    - m. Labels
    - n. Swivel bearing
    - o. Undercarriage
    - p. Track adjustment
    - q. Swivel frame and track frame
  - C. Kit instruction manual
    - a. Convert tracks from rubber to steel

Iii. Engine

III. Engine
- chapter3_Mechanism
  - A. Engine
    - a. Engine specifications
    - b. Performance curve
    - c. Different installation from V3800 basic model.
      - 1. Starter moter
      - 2. Oil filter
- chapter3_Service
  - A. Troubleshooting
  - B. Servicing specifications
  - C. Disassemble and Reassmble
    - a. Pump coupling
    - b. Radiator
    - c. Air cleaner
    - d. Muffler
    - e.Fuel tank
    - f. Fuel hose
    - g. Compressor
    - h.Control cable
    - i. Fan belt
    - j. Engine stop lever
    - k. Engine bracket
    - l. Engine assy
  - D.Engine WSM
    - General
      - 1. ENGINE IDENTIFICATION
      - 2. GENERAL PRECAUTIONS
      - 3. MAINTENANCE CHECK LIST
      - 4. CHECK AND MAINTENANCE
      - 5. SPECIAL TOOLS
    - Mechanism
      - 1. FEATURE
      - 2. ENGINE BODY
      - 3. LUBRICATING SYSTEM
      - 4. COOLING SYSTEM
      - 5. FUEL SYSTEM
      - 6. TURBOCHARGER SYSTEM
      - 7. INTAKE SYSTEM
    - Service
      - 1. TROUBLESHOOTING
      - 2. SERVICING SPECIFICATIONS
      - 3. TIGHTENING TORQUES
      - 4. CHECKING, DISASSEMBLING AND SERVICING

Iv. Hydraulic System

IV. Hydraulic system
- chapter4_Mechanism
  - A. General
    - a. Features of the hydraulic system
    - b. Main specifications of hydraulic components
    - c. Hydraulic components layout
    - d. Hydraulic Circuit Diagram
      - 1. Circuit diagram, EU-version
      - 2. Circuit diagram, PP-version
      - 3. Circuit Diagram, PP-version
  - B. Hydraulic pump
    - a. Main specifications
    - b. Outer view
    - c. Structure
    - d. Functional parts 1
    - e. Functional parts 2
    - f. Pump control circuit
      - 1. LS control 1
      - 2. LS control 2
      - 3. LS control 3
      - 4. Horse power control 1
      - 5. Horse power control 2
      - 6. Horse power control 3
      - 7. LS control and Horse power control
    - g. FYI (For Your Information)
      - 1. LS pump swash plate control mechanism
      - 2. Horse power control mechanism
  - C. Control Valve
    - a. Feature
    - b. Outline
    - c. Control valve
      - 1. Overall view of control valve
      - 2. Control valve specifications
      - 3. Swing section
      - 4. Control valve; Uni-block section assy
      - 5. Boom
      - 6. S/P1
      - 7. Bucket
      - 8. Arm
      - 9. Travel independent valve
      - 10. Travel, R section
      - 11. Travel, L section
      - 12. Combined valve
      - 13. S/P2 valve
      - 14. Dozer section
      - 15. Swivel section
      - 16. Outlet section, P3 bypass valve
    - d. Layout, delivery circuit and external pipe flow
    - e. Inlet section of mono-block valve
    - f. Center closed valve section (Bucket, S/P 1, Boom)
    - g. Center closed valve section (Arm)
    - h. Arm regenerative flow
    - i. Swing section (Center closed valve)
    - j. P1 and P2 inlets and travel selector valve
    - k. Travel section (Center open type)
    - l. P3 inlet and P3 confluence section
    - m. SP2 section (Mechanical flow adjustment)
    - n. Swivel section
    - o. P3 bypass confluence valve
    - p. LS bleed
  - D.Control valve circuit
    - a. Control valve hydraulic circuit diagram
    - b. Control valve hydraulic circuit in traveling
    - c. Control valve hydraulic circuit under LS system control without traveling
    - d. Control valve P3 hydraulic circuit
    - e. Control valve P3 confluence hydraulic circuit
    - f. Control valve P3 bypass circuit
    - g. Control valve high-pressure selection function
    - h. Control valve AI signal hydraulic circuit
    - i. FYI (For Your Information)
      - 1. LS load’s maximum pressure detection method
      - 2. SP2 flow control : Mechanical oil flow adjustment
      - 3. S/P2 flow control mechanism
  - E. Travel pilot valve (with damper)
    - a. Outline
    - b. Specifications
    - c. Structure
    - d. Function
      - 1. Reducing valve section
      - 2. Operation section damping mechanism
      - 3. Shuttle valve section
  - F. Pilot valve (Control lever L and R )
    - a. Structure & specifications
    - b. Pilot valve control diagram (L and R)
    - G.Pilot valve, swing and dozer
    - d. Internal structure
      - 3. Release function of negative valve
    - d. Shock-absorbing valve (Anti Swivel Back Valve)
      - 1. Outline
      - 2. Structure
      - 3. Function
      - 4. Swivel motor, swivel back prevention mechanism
  - G.Pilot valve, swing and dozer
  - H. Swivel motor
    - a. General
      - 1. Swivel motor outer view
      - 2. Swivel motor structure
      - 3. Structure of reduction gear case
      - 4. Structure of brake valve
    - b. Function of swivel motor
      - 1. Hydraulic motor
      - 2. Relief valve
      - 3. Negative brake release
      - 4. Negative brake function
      - 5. Planetary reduction ratio
    - c. Parking brake and hydraulic timer
    - d. Shock-absorbing valve (Anti Swivel Back Valve)
      - 1. Outline
      - 2. Structure
    - e. Shuttle valve (High-pressure selector valve)
      - 1. Outline
      - 2. hose connection
  - I. Travel motor (GM10VA : S/N 10410~)
    - a. General
      - 1. Product applications
      - 2. Specifications
      - 3. Type coding
    - b. Outside dimensions
    - c. Basic structure and drawings
  - J. Shockless valve of Boom cylinder pilot line
  - K. Boom cylinder holding valve
    - a. Outline
    - b. Specifications
    - c. Circuit diagram
    - e. Holding valve installation
    - f. Main parts function
    - g. Circuit function
      - 1. Neutral position
      - 2. With oil flowing from A-port to B-port (from main control valve to cylinder)
      - 3. With oil flowing from B-port to A-port (from cylinder bottom side to main control valve)
      - 4. Over-pressure in the cylinder (Relief valve activated)
      - 5. Manual release of cylinder bottom oil
  - L. Proportional Solenoid valve (S/P1)
    - a. Specifications
    - b.Structure
    - C. Structure and function
  - M. Solenoid valve for S/P2
  - N. Change valve (Pilot system unload valve)
  - O. Accumulater
  - P.TPSS(Two pattern selection system)
  - Q. Accessaries
    - a. Suction filter
    - b.Return filter
    - c.Pilot filter
    - d.Hydraulic oil tank cap
    - e.Oil cooler
- chapter4_Service
  - A. Troubleshooting
    - a. Case – Study : Abnormal speed
    - b. Case – Study : The power is weak.
    - c. Case – Study : Poor Manipulation and Abnormal Operation
    - d. LS control system troubleshooting
    - e. Pump component trouble causes and remedy
    - f. Control valve component troubleshooting
    - g. Travel motor component troubleshooting
  - B.Specifications
    - a.Specifications of pump
    - b.Relief Valve pressure setting
      - 4.Remove gear pump.
    - c.Swivel performance
    - d.Traveling performance
    - e.Cylinder
  - C. Testing
    - a. Testing Instruments & special tools
    - b. Precautions in handling the pump
    - c. Pilot pressure
    - d. Main relief valve : LS system
    - e. Main relief valve : Travel system
    - f. Unload valve
    - g. Overload relief valve
    - h. Swivel brake valve pressure
    - i. Measuring the main pump Max. flow rate
    - j. Measuring the main pump’s stand-by flow rate
    - k. LS control pressure
    - l. Traveling motor drain amount
    - m.Swivel motor drain amount
    - n. Swivel motor block performance
    - o. Traveling motor block performance
    - p. Operating speed
  - D.Disassembling and Reassembling
    - a. Coupling flange
    - b.Pump
    - c.Gear pump (P3, Pp)
    - d.Control valve
    - e. Pilot valve
    - f.Dozer pilot valve
    - g.Swing pilot valve
    - h.Travel pilot valve
    - i.Swive. motor
    - j.Travel motor (Wheel motor)
    - k.Rotary joint (Swivel joint)
    - l. Holding valve
    - m. Hydraulic tank
    - n.Filters
    - o.Three way change valve
    - p.Pilot primary line and T port block
    - q.Swivel shuttle valve
    - r.pilot hose relay plate
    - s.Pilot hose relay adapter
    - t.Unload valve
    - u.SP1 and SP2 solenoid valve
    - v.Pilot pump relay block
    - w.Pilot line filter
    - x.Cylinders
    - y.TPSS valve
    - z.Hydraulic hose
    - aa.Hose route
    - ab.Hose list :

V. Electrical System

V. Electrical system
- chapter5_Mechanism
  - A. Feature and main function
    - a. Development concept
      - 1. Features of KX080-3 system
      - 2. Electrical system : Functional comparison
    - b. Service port1 (S/P1) speed limit control
      - 1. Background and concept of R&D
      - 2. Outline of new function
      - 3. How to operate servcie port 1
      - 4. Setting of limited flow volume (10 steps)
      - 5. Setting of limited flow volume, S/P1 (15 steps)
      - 6.1-way or 2-way CIRCUIT
      - 7. One way flow operation
      - 8. Second service port operation
      - 9. Second service port operation
      - 10. Instrument panel, switch
      - 11. FYI (For Your Information)
    - c. Fuel supply pump
      - 1. Main parts
      - 2. How to use
      - 3. Structure
      - 4. Electrical system function
    - d. Intake air heater control
      - 1. Location of main components
      - 2. Outline of control system
    - e. Boom cylinder overload sensing
      - 1. Part name
      - 2. Specifications
    - f. Travel alarm system
  - B. Electrical components and circuit diagram
    - a. Components layout
    - b. Main components diagram
    - c. Electrical circuit diagram
    - d. Electrical wiring diagram
    - e. Service mode flow chart
  - C. Finger control service port system
    - a. Feature and purpose
    - b. Outline of control system
      - 1. Aux. port finger operation
      - 2. Control layout
      - 3. Service port system components
    - c. Hydraulic circuit diagram
    - d. Knob Switch structure and function
      - 1. Structure of knob switch
      - 2. Basic operation of the knob
      - 3. Flow chart; Service port operation
      - 4. S/P switch (service port switch)
      - 5. How the knob switch works
      - 6. Breaker operation
      - 7. Interrelation among current, pressure and flow
    - e. Initial settings of the knob
      - 1. Set-up and adjustment of service port
      - 2. Purpose
      - 3. Background and meaning of knob initial set-up
    - f. S/P valve start point setting
      - 1. Performance characteristics profile: Knob shift amount vs Output current
      - 2. Background and meaning of start-point setting
      - 3. Illustration of the start-point setting
      - 4. Practical behavior at the start-point setting
      - 5. S/P valve initial set-up flow chart
      - 2. Display flow chart with photo
      - 3. Knob initial set-up
      - 4. S/P valve initial set-up
      - 5. S/P operational feeling adjustment
    - g. Manual feeling setting
    - h. Panel display operation flow chart
    - i. Proportional control solenoid valve (S/P valve)
    - j. Other controls
    - k. Troubleshooting
  - D. Kubota Intelligent Control System (KICS)
    - a. Features of digital meter
    - b. Operating Mode
    - c. Service mode menues
    - d. Auto idling (AI) control system
    - e. Main component’s function
    - f. Failure Diagnosis
    - g. Service mode flow chart
  - E. Other main components
    - a. Amp. unit
- chapter5_Service
  - A. Troubleshooting
    - a. General guideline
    - b. Troubleshooting flow chart
  - B. Wire harness installation
    - a. Precautions
    - b. Engine earth, starter switch
    - c. Checking cables, wires and battery
    - d.Wireharness route
  - C.Installation of main parts, couplers and harnesses
    - a.Around the operator’s seat
    - b.Front
    - c.Fuel tank
    - d.Starter, alternator, battery
    - e.Fuses
    - f. Solenoid valve wiring
    - g. Air conditioner wiring
    - h.Cab wire harness
    - i.Circuit diagram of cab harness
    - j.Relay
    - k. Travel alarm kit

Vi. Air Conditioner

VI. Air Conditioner
- chapter6_Mechanism
  - A. Air conditioner system
    - a. Introduction of air conditioner
    - b. Function and structure
  - B. System components; KX080-3
    - a. Components and location
    - b. Control panel
    - c. Air conditioner unit
  - C. Main components
    - a. Compressor
      - (1) Outline of sliding-vane type compressor (SV07 type) : KX080-3, KX121-3, 161-3
      - (2) Feature
      - (3) Main specifications
      - (4) Structure & Function
    - b. High pressure relief valve
    - c. Magnetic clutch
      - (1) Principle
      - (2) Magnetic Clutch
      - (3) Operation
    - d. Condenser
      - (1) Description
      - (2) Type of Condenser
    - e. Receiver
    - f. Dual pressure switch
      - (1) Location & structure
      - (2) When the Pressure is Abnormally High
      - (3) When the Pressure is Abnormally Low
    - g. Air Conditioner Unit
    - h. Box type expansion valve
    - i. Evaporator
    - j. Heater core
    - k. Water valve
    - l. A/C blower
    - m. A/C blower resistor
    - n. Relays
  - D. Frost control
    - [Function]
    - a. KX121-3, 161-3
      - [Function]
    - b. KX080-3
      - [Function]
  - E. Electric circuit diagram
    - a. KX121-3, 161-3
    - b. KX080-3
- chapter6_Service
  - A. Servicing specifications
    - a. Specifications of A/C system and components
    - b. Performance specifications
    - c. Adjustment and testing
    - d. Ambient temperature vs normal high-low pressure range
    - e. Tightening torques
  - B. Regular check and service points
    - a. Maintenance interval ; Air conditioner
  - C. Troubleshooting
    - a. Procedure
    - b. Asking the user and confirming the phenomenon
    - c. Troubleshooting from problem symptoms (except refrigeration cycle troubles)
    - d. Connecting the pipes
      - (1) Replacing the O-rings
      - (2) Charging compressor oil in replacing the functional parts
    - e. Checking the refrigeration cycle
      - (1) Checking the refrigerant amount
      - (2) Using a gauge manifold
      - (3) Checking for gas leak
      - (4) Precautions
      - (5) Check performance of air conditioning system

Vii Anti-Theft System

VII Anti-theft System
- A.Outline of anti-theft system
  - 1.Feature of Kubota New Security Key
  - 2.System structure
  - 3.Principle of new security system
- B. Types and roles of keys
  - 1.Black key
  - 2.Red key
- C.Meter panel display for owners and operators
  - 1.Display with the registered key (normal meter panel display)
  - 2. Attempt to start the engine with the unregistered key
  - 3.Black key registration
- D.Service mode meter panel display
  - 1.Function of tester menu
  - 2.How to reach the tester menu
  - 3.Service mode flow chart
- E.Electric circuit diagram
  - 1.KX080-3 circuit diagram
  - 2..KX080-3 wiring diagram
- F.Troubleshooting
  - 1. Kubota I.C.S. navigation display and troubleshooting.
  - 2. Diagnosis flow chart
- G. Anti-theft key handling
- H.Engine starting method with the anti-theft black key
- I.Kubota original Anti-theft key and registration
- J. Anti-theft key function test
- K. For sales feature
- L. For structural study
- M. FAQ

Conversion Tables

Conversion Tables

Specification

Specification	Kubota KX080-3 Mini Excavator
Engine Model & Power	Kubota V3307DI-T diesel, ~64 hp gross (47.8 kW) @ 2,000 rpm
Operating Weight	~8,170 kg (~18,000 lb) including operator
Digging Depth (Max)	~4,290 mm (~15 ft 1″)
Vertical Wall Digging Depth	~3,490 mm (~12 ft 7.6″)
Bucket Breakout Force	~6,650 kgf (~14,650 lb)
Auxiliary Hydraulic Flow	Variable flow via load-sensing 3-pump system
Dimensions (L × W × H)	6,420 mm × 2,200 mm × 2,510 mm (~21 × 7.2 × 8.2 ft)
Track Width	450 mm

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