Takeuchi TB250 Mini Excavator Workshop Manual (CK7E013) (SN 125000004-)

On a TB250 that spends its life trenching, loading trucks, and working around utilities, this workshop manual is what I’d keep open on the bench or tablet while the machine’s stripped down. It walks you through how to tear down, inspect, and correctly put back together the main systems so you don’t miss a step. For example, if you’ve got a weak boom or jerky travel, this is what I’d use to trace the hydraulic circuit, verify adjustments, and confirm everything is reinstalled and bled properly before sending it back to the job.

Applications & Use Cases

• Plan a full repair sequence before you start pulling pumps, motors, or final drives, so hoses and brackets go back where they belong.
• Isolate hydraulic faults by following a logical check order instead of guessing at cylinders, valves, or pilot lines.
• Inspect wear points on swing, undercarriage, and boom components and decide what must be replaced versus reused.
• Verify reassembly and adjustments on controls, linkages, and travel gear to avoid binding, drift, or misalignment.
• Support parts identification by matching what you see on the machine to the illustrated assemblies while it’s apart.

FAQ

Q: Can I use this manual on a tablet in the field?

A: Yes, it’s practical to keep it on a tablet or laptop so you can zoom in on diagrams right beside the machine.

Q: Is it worth printing sections of this manual?

A: Printing the procedures you’re doing that day is handy—you can mark notes, keep it from getting oily, and tape it inside the cab.

Safety Note

Always lock out, support, and relieve system pressures exactly as described before loosening any component.

Takeuchi TB250 Mini Excavator Index:

• REVISION HISTORY
• FOREWORD
  • Directional terms: front, rear, left, right
  • Machine serial number
  • Symbols used in this manual
  • Manual structure
• 1 SAFETY
  • SAFETY ALERT SYMBOL
  • SAFETY PRECAUTIONS
    • Observe all safety rules
    • Wear safe clothing and protective gear
    • Install an extinguisher and a first aid kit
    • Lockout/Tagout (LOTO)
    • Use the correct tools
    • Regularly replace the safety-critical parts
    • Explosionproof lighting
    • Prohibit access by unauthorized persons
    • Prepare the work area
    • When the canopy is tilted up
    • Keep the machine clean
    • Stop the engine before performing maintenance
    • Keep clear of the moving fan and belt
    • When working under the machine
    • When working on the machine
    • Securing the working equipment
    • Secure the engine hood and guard when they are open
    • Place heavy components in a stable position
    • Caution when filling with fuel or oil
    • Handling of hoses
    • Be careful with hot and pressurized components
    • Handling of radiator
    • Be careful with oils under pressure
    • Release the residual pressure from the hydraulic system before performing maintenance
    • Be careful with grease under pressure
    • Handling of the accumulator
    • Disconnect the battery
    • Use caution when handling batteries
    • Have a service agent repair welding cracks or other damage
    • Checks after maintenance
    • Disposing of wastes
  • CAUTIONS WHEN WORKING
    • Before starting work
    • When disassembling or assembling
    • When removing/installing the hydraulic unit
    • When connecting/disconnecting the hoses or pipes
    • Handling of seals
    • Pressure adjustment for hydraulic devices
• 2 SERVICE DATA
  • DIMENSIONAL DRAWING
  • SPECIFICATIONS TABLES
  • LUBRICANT AND FUEL CHART
  • PERFORMANCE CRITERIA
  • TIGHTENING TORQUE
  • HYDRAULIC CIRCUIT DIAGRAM
    • For outside Japan
      • 125000004 or later
      • High flow specification
        • 125000004 or later
    • For Japan
      • 125000583 or later
      • High flow specification
        • 125000583 or later
    • Angle blade specification
      • 125000583 or later
      • High flow specification
        • 125001216 or later
  • ELECTRICAL CIRCUIT DIAGRAM
    • Type 1
      • Serial No.: 125000004 to 125006894
      • Serial No.: 125006895 or later
    • Type 2
      • Serial No.: 125000004 to 125006894
      • Serial No.: 125006895 or later
    • Type 3
      • Serial No.: 125000004 to 125006894
      • Serial No.: 125006895 or later
    • Type 4
      • Serial No.: 125000004 to 125006894
      • Serial No.: 125006895 or later
    • Air conditioner
  • WIRE HARNESS WIRING DIAGRAM
• 3 FUNCTION
  • Piston pump
  • Gear pump
  • Control valve
  • Pilot valve
  • Proportional control solenoid valve
  • Emergency shut-off valve
  • CylinderS
  • Travel motor
  • Slew motor
  • Swivel joint
• 4 DISASSEMBLY AND ASSEMBLY
  • Service standards
  • Drive system
  • Travel system
  • Slew system
  • Upper frame
  • Control system
  • Attachments
  • Hydraulic tank
  • Hydraulic pump
  • Control valve
  • Pilot valve
  • Proportional control solenoid valve
  • Pilot valve (auxiliary)
  • Pilot valve (travel)
  • Solenoid valve (1-section)
  • Solenoid valve (2-section)
  • Solenoid valve (Auxiliary line piping switching)
  • Cylinders
  • Travel motor
  • Slew motor
  • Swivel joint
  • Air conditioner
• 5 TROUBLESHOOTING
  • Overall machine
  • Traveling
  • Slewing
  • Boom
  • Arm
  • Bucket
  • Boom swing
  • Dozer blade
  • Auxiliary hydraulics
  • Piston pump
  • Gear pump
  • Control valve
  • Pilot valve
  • Proportional control solenoid valve
  • Cylinders
  • Travel motor
  • Slew motor
  • Air conditioner

Takeuchi