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Kubota K008-3, U10-3 Workshop Repair Manual

Kubota K008-3, U10-3 Excavator Workshop Repair Manual

$32.00

🚜 Equipment
Brand	Kubota
Type	Excavator
Model	K008-3, U10-3
📄 Documents
Type	Repair Manual
Publication	97899-60730
Language	English
Format	PDF
No of Pages	392

The Kubota K008-3 and U10-3 Ultra-Compact Excavators are designed for operators who need powerful performance in tight spaces. These models combine reliability, maneuverability, and precision with Kubota’s advanced engineering, making them ideal for landscaping, utility work, and small construction projects. With engines delivering 10.3 horsepower, both models provide consistent digging performance while maintaining a compact footprint for access through narrow passages.

The K008-3, weighing around 2,200 lbs, features a retractable undercarriage (700–860 mm) for superior stability and access in confined job sites. It offers a maximum digging depth of approximately 1.7 meters (5’7”) and a bucket breakout force of 2,200 lbs. The U10-3, slightly heavier at 2,470 lbs, is equipped with an advanced zero-tail swing design, enabling full swing capability in limited spaces. It provides a digging depth of 1.8 meters (5’11”) with a bucket breakout force of 1,060 kgf (10.4 kN). Both models use Kubota’s D722 three-cylinder diesel engine, ensuring efficiency and durability.

The workshop repair manual delivers comprehensive coverage of every system, including engine, electrical, undercarriage, hydraulic circuits, swivel motor, and control valves. It includes detailed service fundamentals, safety procedures, step-by-step disassembly/reassembly, wiring diagrams, hydraulic schematics, torque specifications, lubrication intervals, and testing procedures. This ensures that technicians and owners can maintain factory performance and extend machine life with confidence.

Key Highlights

Kubota D722 three-cylinder diesel engine with 10.3 hp output
K008-3: 2,200 lb operating weight, 1.7 m digging depth, adjustable track frame (700–860 mm)
U10-3: 2,470 lb operating weight, 1.8 m digging depth, zero-tail swing design
Hydraulic system output of ~21 L/min for efficient attachment use
Bucket breakout forces: 2,200 lb (K008-3) / 1,060 kgf (U10-3)
Compact width under 1 m for access to confined job sites
Repair manual includes servicing fundamentals, hydraulic/electrical schematics, and troubleshooting
Step-by-step assembly/disassembly procedures with torque and lubrication data
Designed for easy maintenance and operator safety with comprehensive service guidance

Table of Content

📙 Table of Contents

Wsm_K008-3_U15-3

WSM_K008-3_U15-3
- CONTENTS
- I. General
  - A. Body and engine identification marks
  - B. Safety precautions for servicing, disassembly and reassembly
    - a. Safety measures before starting work
      - (1) Work clothes
      - (2) Inspecting equipment and tools
      - (3) Keep workshop in order
    - b. Safety measures during work
      - (1) Protectors
      - (2) Team work
      - (3) Disassembly and assembly
      - (4) Cranes
      - (5) Others
    - c. Preparation for disassembly
      - (1) Cleaning
      - (2) Acceptance inspection
      - (3) Equipment and tools
    - d. Precautions for disassembly and reassembly
      - (1) Disassembly
      - (2) Reassembly
  - 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 Wire harness Clamps are in their Specified Positions.
    - c. With the Machine Front in a Specified Posture, Check the Amount of Hydraulic 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) Tightening torque table for hose clamp (Screw type)
      - (7) Nuts for piping
      - (8) Tightening torque of bolts and nuts
      - (9) Types and materials of bolts and nuts
      - (10) Washer-equipped elbow
  - F. Machine Quality Specifications
    - a. K008-3, U10-3 EU-Version
    - b. K008-3 KTC KCL, KTA – Version
  - G. Maintenance intervals
    - a. Hydraulic Oil Check for machines with Hydraulic Breakers
- II. Machine body (Mechanism section)
  - A. Specifications
    - a. EU – version
    - b. KTC, KCL, KTA – version
  - B. Component interchangeability
    - a. Bucket
  - C. Machine structure
    - a. Control linkage
      - (1) Operating lever lock (K008-3)
      - (2) Traveling lever
      - (3) Operating lever
      - (4) Dozer (K008-3)
      - (5) Swing and Service port (K008-3)
      - (6) Accelerator lever
      - (7) Change lever for retracting track frame
    - b. Engine mount
    - c. Under carriage
      - (1) Crawler Tension
      - (2) Track roller
      - (3) Retractable undercarriage
      - (4) Rubber Crawler
- II. Machine body (Service section)
  - A. Specifications
    - a. Machine Weight
      - (1) K008-3, U10-3 EU – version
      - (2) K008-3 KTC, KCL, KTA – version
    - b. Machine specifications
      - (1) K008-3, U10-3 EU version
      - (2) K008-3 KTC, KCL, KTA version
    - c. Lever stroke and operating force
      - (1) K008-3, U10-3 EU version
      - (2) K008-3 KTC, KCL, KTA version
    - d. Dimensions of Parts
      - (1) Front pins
      - (2) Bucket
      - (3) Rubber crawler
      - (4) Track roller, idler, sprocket
      - (6) Dozer
      - (7) Parts weight
      - (7) Water and Oil Quantity
  - B. Front attachment
    - a. Front attachment assembly procedure
    - b. Greasing points
  - C. Upper Structure
    - a. Operating unit
      - (1) K800-3 mechanical operating unit
      - (2) Accelerator lever
    - b. Dozer lever
    - c. Swing pedal
    - d. Service port pedal
    - e. Tank
      - (1) Oil tank
    - f. Weight
  - D. Under carriage
    - a. Swivel bearing
      - (1) Assembly sketch of swivel bearing (K008-3)
      - (2) Exploded view of swivel bearing (K008-3)
      - (3) Assembly sketch of swivel bearing (U10-3)
      - (4) Exploded view of swivel bearing (U10-3)
    - b. ROPS
    - c. Seat belt setup angle
    - d. Take-up Unit
      - (1) Idler assembly
      - (2) Track roller
      - (3) Grease cylinder
    - e. Track Frame (Adjustable Leg Specification)
      - (1) Route of adjustable leg hose
      - (2) Exploded view of track frame
      - (3) Adjustment of crawlers
- III. Engine (Mechanism section)
  - A. Safety first
  - B. Engine specifications for construction machinery
  - C. Engine electric components
  - D. Performance Curve
  - E. Dimensions
- III. Engine (Service section)
  - A. Engine mount on the machine
    - (1) Engine bracket, vibration proof rubber
    - (2) Muffler
  - B. GENERAL
    - [1] ENGINE IDENTIFICATION
    - [2] GENERAL PRECAUTION
    - [3] TIGHTENING TORQUES
      - (1) Tightening torques for special use screws, bolts and nuts
      - (2) Tightening torques for general use screws, bolts and nuts
      - (3) Main bearing case assembly – Type 1
      - (4) Main bearing case assembly – Type 2
- IV. Hydraulic system (Mechanism section)
  - A. Main pump (K008-3, U10-3)
  - B. Pilot pump (U10-3)
  - C. Control valve
    - a. Specifications
    - b. General view of Control valve
    - c. Sectional view
      - (1) K008-3 EU – version : P/N RA021-61160
      - (2) K008-3 KTC, KCL, KTA – version : P/N RA021-61130
      - (3) U10-3 : P/N RA131-61160
    - d. Structure and function
      - (1) Relief valve function
      - (2) Anti cavitations valve function
      - (3) Load check valve function
  - D. Pilot valve
    - a. Structure
    - b. Pilot valve control diagram
    - c. Function
      - (1) Basic function
      - (2) Functions of major parts
      - (3) Operation
  - E. Hydraulic pilot circuit
    - a. Flow of oil at the time when the control lever lock is at lock position (A)
      - a. Control lever lock being at lock position
    - b. Flow of oil at the time when the control lever lock is at unlock position (B)
      - b. Control lever lock being at unlock position
    - c. Flow of oil in boom lifting operation
    - d. Flow of oil in bucket dumping operation
      - d. Flow of oil in bucket dumping operation
    - e. Flow of oil in arm crowding operation
      - e. Flow of oil in arm crowding operation
    - f. Flow of oil in right swivel operation
      - f. Flow of oil in right swivel operation
  - F. Swing motor (K008-3, U10-3)
    - a. Structure and specifications
    - b. Operating principle
  - G. Rotary joint (Swivel Joint)
  - H. Travel motor
    - a. Single speed motor (K008, EU-version)
      - (1) Structure & Specifications
    - b. Two speed motor
      - (1) Structure & Specifications
      - (2) Specifications
  - I. Hydraulic circuit
    - a. K008-3 : EU – version
    - b. K008-3 : KTC, KCL, KTA – version
    - c. U10-3 : EU – version
    - d. Hydraulic components layout : K008-3
- IV. Hydraulic system (Service section)
  - A. Troubleshooting
    - a. Machine general
    - b. Hydraulic System
      - (1) Hydraulic system
      - (2) Swivel system
      - (3) Travel system
  - B. Specifications
    - a. Pump System
      - (1) Discharge
      - (2) List of pressures
    - b. List of Relief Valves
    - c. Noise
    - d. Swivel system
    - e. Traveling system
    - f. Cylinder system
      - (1) Cylinder speed
      - (2) Degree of free-fall
      - (3) Boom/Arm/Bucket/Swing/Blade Specification
      - (4) Table of dimensions of cylinder parts
  - C. Testing
    - a. Pump flow test
    - b. Pilot pressure (U10-3)
      - (1) Primary pressure
      - (2) Secondary pressure
      - (3) Main relief valve pressure
    - c. Swivel motor block performance
    - d. Traveling motor block performance
    - e. Operating speed
      - (1) Checking each operating speed.
      - (2) Boom cylinder
      - (3) Arm cylinder
      - (4) Bucket cylinder
      - (5) Swing cylinder
      - (6) Dozer cylinder
      - (7) Swivel speed
      - (8) Traveling speed
    - f. Straight travel performance
    - g. Cylinder natural fall amount
    - h. Control and Traveling lever operating force
    - i. Lever stroke
  - D. Disassembling and Assembling
    - a. Pump coupling
    - b. Pump
      - (1) Pump (Main) assembly drawing
      - (2) Route of delivery hose
      - (3) Pump (Pilot) assembly drawing
      - (4) Disassembly and reassembly
      - (5) Control valve
      - (6) Control valve joint
    - c. Pilot valve
      - Hydraulic operating unit
    - d. U10-3 Component parts of hydraulic operating unit
      - (1) Unload valve
      - (2) Super change valve
      - (3) Valve assembly (Relief)
      - (4) Pilot valve
    - e. U10-3 hydraulic operating unit bleeding procedure
    - f. Disassembling and assembling
      - (4) Trouble shooting
    - g. Swivel motor
      - (1) K008-3 mounting position
      - (2) U10-3 mounting position
      - (3) Swivel motor disassembly and assembly procedure.
  - E. Swivel Joint
    - a. Assembly and Disassembly
      - (1) Disassembly and assembly of swivel joint
    - b. Wheel Motor
      - (1) Mounting the wheel motor adaptor
      - (2) Route of wheel motor hose
    - c. Wheel Motor (made by Eaton Equipment Co. Ltd.)
      - (1) Wheel motor disassembly and assembly procedure
      - (2) Troubleshooting
    - d. Cylinder
      - (2) Disassembling and assembling
      - (3) Inspection
  - F. Route of Hydraulic Hose
    - (1) Route of control valve hydraulic hose (Fixed leg, 1-speed)
    - (2) Route of return hose
- V. Electrical system (Service section)
  - A. Wire harness
    - a. Wire harness (1)
    - b. Wire harness (2)
    - c. Wire harness (3)
  - B. Electric Wiring
    - a. Cautions on electric wire clamping method
      - (A) Clamp to valve assembly (check)
      - (B) Wiring to fuel sensor
      - (C) Clamping to bracket (step)
      - (D) Clamping of wire harness (1) and the battery plus cord
      - (E) Clamping of wire harness for alternator, oil switch and slow-blow fuse
      - (F) Clamping to the engine breather
      - (H) Clamping to the support (radiator)
      - (G) Clamping of the battery plus cord and the wire harness (1) to the swivel frame.
      - (I) Clamping of the cord (battery plus) and the cord (battery minus) to the wire harness for sole…
      - (J) Assembling the cord (battery)
      - Front
      - (K) Assembling the body ground and the battery minus cord
      - (M) Wiring to working light
      - (L) Assembling the cord (battery plus)
  - C. Troubleshooting of Electric System
    - a. Outline of troubleshooting
      - (1) Procedure
    - b. Cautions in general
      - (1) Checking of conductivity and voltage at coupler
      - (2) Checking procedure for removal of pin
      - (3) Checking method
      - (4) Checking of fuse
      - (5) Checking of wire harness
      - (6) Handling and checking of battery
      - (7) Measuring instrument and special tools
    - c. Troubleshooting
      - (1) Engine system
      - (2) Panel (key switch: ON)
      - (3) Panel (Engine start)
      - (4) Others
    - d. Checking procedure
      - (1) Starter
      - (2) Engine stop
      - (3) Charger
      - (4) Horn, fuel pump and working light
      - (5) Charge lamp, oil lamp and fuel lamp
      - (6) Others

Specification

Specification	Kubota K008-3 Ultra-Compact Excavator	Kubota U10-3 Ultra-Compact Excavator
Engine Model & Type	Kubota D722-E4, 3-cyl diesel, Tier IV/E-TVCS	Kubota D722-E3-BH6, 3-cyl diesel
Gross / Net Power	~10.3 hp (7.7 kW)	~10.3 hp (7.7 kW)
Operating Weight	~2,200 lb (1,000 kg)	~1,120 kg (2,470 lb)
Digging Depth	~1.7 m (5′ 7″)	1.8 m (5′ 11″)
Travel Speed	~2.5 mph (4 km/h)	~4 km/h (2.5 mph)
Breakout Force (Bucket)	~2,200 lb (9.8 kN)	~1,060 kgf (10.4 kN)
Auxiliary Hydraulic Flow	~5.55 gpm (21 L/min)	21 L/min
Track Width (adjustable)	700–860 mm	750–990 mm
Bucket Capacity	~0.022 m³	0.022–0.024 m³

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Frequently Asked Questions❔

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