Takeuchi TB235 Mini Excavator Workshop Manual (CG7E008) (SN 123500004-)
Out on utility digs or foundation prep, the TB235 spends its life in tight spaces, working around services and structures. This workshop manual is what I reach for when I need the correct sequence to strip, inspect, and reinstall major components without creating new problems. If, for example, the boom drifts down when you park the machine, I’d use this book to trace the hydraulic circuit, verify adjustment points, and refit the valve or cylinder safely once the fault’s found.
Applications & Use Cases
- Plan a full teardown of major components so parts come off and go back on in the right order.
- Trace hydraulic issues like weak travel or slow boom by following the recommended diagnostic steps.
- Inspect wear points on pins, bushings, and swing components and decide what must be replaced now vs. later.
- Align and tighten undercarriage and slew components to factory patterns after repairs.
- Verify all controls function correctly after reassembly before sending the machine back to work.
FAQ
Q: Can I keep this manual on a tablet in the field?
A: Yes, it’s practical to use digitally; you can zoom diagrams and search terms while standing at the machine.
Q: Is it worth printing sections of this manual?
A: I print the pages for the job I’m doing so they can get greasy without risking my device.
Safety Note
Always follow the manual’s isolation, blocking, and pressure-relief steps before loosening any component.
Takeuchi TB235 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
- Other
- 123500004 or later
- Angle blade specification
- 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)
- Cylinders
- Travel motor
- Slew motor
- Swivel joint
- Air conditioner
- 5 TROUBLESHOOTING
- Overall machine
- No operation is possible.
- All systems working, but insufficient power.
- Boom, bucket, slew and arm fail to move or are too slow.
- Traveling
- Right or left travel is impossible
- Right or left travel speed drops causing the machine to veer to one side
- Machine will not travel in 2nd speed
- Slewing
- No slewing
- Does not slew to the right or left
- Slewing is slow or lacks power
- The machine slews, but the overrun when slewing stops is large, or slewing cannot be stopped
- When stopped on a slope, the slewing mechanism cannot maintain its posture
- Boom
- The boom cylinder does not move
- Boom cylinder operation is slow or lacks power
- When the boom control lever is pulled slowly, the boom drops at first
- Spontaneous drop of the bucket is too large
- Arm
- Arm cylinder does not move
- Arm cylinder is slow or the power is insufficient.
- Spontaneous drop of the arm is too large
- Bucket
- Bucket cylinder does not move or lacks power
- Spontaneous drop of the bucket is too large
- Boom swing
- Swing cylinder does not move
- Blade
- Blade cylinder does not move or lacks power
- The spontaneous drop of the blade is too large, or the blade cannot support the machine
- Auxiliary hydraulics
- Proportional control does not work
- Piston pump
- Gear pump
- Control valve
- Pilot valve
- Proportional control solenoid valve
- Cylinders
- Travel motor
- Slew motor
- Air conditioner
Takeuchi
