Takeuchi TB228 Mini Excavator Workshop Manual (CE7E013) (SN 122800004-)

On a TB228 that spends its life trenching, digging around services, and working in tight construction sites, this workshop manual is what I’d keep open whenever I’m into major components. It walks you through structured repair sequences so you’re not guessing on teardown order or how to put things back without binding or leaks. If you’re chasing a boom drift, noisy final drive, or a weak travel function, this is the document that helps you trace the fault, inspect the right spots, and then reinstall everything with the correct checks before it goes back in the dirt.

Applications & Use Cases

• Plan a full component strip-down and rebuild on the bench, with a clear sequence to avoid damage or missed parts.
• Isolate hydraulic issues by following logical checks instead of swapping parts blindly.
• Verify undercarriage and slew system alignment and reassembly after major repairs.
• Inspect, clean, and reseal key joints and housings so they stay dry once back on site.
• Double-check control linkages and safety devices after repairs to ensure smooth, predictable operation.

FAQ

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

A: Yes, it’s practical to keep it on a tablet; you can zoom diagrams and search text while standing next to the machine.

Q: Is it still worth printing sections of this manual?

A: Definitely; printing the pages you’ll use lets you mark measurements, notes, and oil paths without risking your device.

Safety Note

Always lock out, support, and depressurize the machine exactly as described before opening any component.

Takeuchi TB228 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 Japan
      • 122800004 or later
    • Other
      • 122800004 or later
      • Angle blade specification
        • 122801073 or later
  • Electric circuit diagram
  • 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
• 5 TROUBLESHOOTING
  • Overall machine
  • Slewing
  • Arm
  • Bucket
  • Boom swing
  • Auxiliary hydraulics
  • Piston pump
  • Gear pump
  • Control valve
  • Pilot valve
  • Proportional control solenoid valve
  • Cylinders
  • Travel motor
  • Slew motor
  • Air conditioner

Takeuchi