Across 258 pages, the Takeuchi TB25 shop manual PDF covers the TB25 compact excavator from teardown through final performance checks. Hydraulic system diagrams lay out the circuits from pump and control valve to the travel and slew motors, and electrical wiring diagrams map the machine's circuits. Troubleshooting is sorted by function: entire machine, travelling, slewing, boom, arm, bucket, boom swing and dozer blade. Torque tables cover hose fittings, pipe fittings and 10.9 bolts. Fill to a 72 l total hydraulic system capacity, and on serials 00103 to 00834 check the P1 and P2 main relief valves at 190 kgf/cm² at 22 l/min. If your job is pulling a hydraulic unit and its piping, with the seal handling that goes with it. Section bookmarks and a searchable text layer take you straight there, and the fittings go back on at the tightening torques the book prints.
What's Inside This Takeuchi TB25 Manual
| System | Pages | Key Topics |
|---|---|---|
| General Cautions | 9 | Safety Guidelines |
| Cautions During Disassembly and Reassembly | 10 | Disassembly Procedures |
| Cautions During Removal and Installation of the Hydraulic Units | 11 | Hydraulic Unit Handling |
| Cautions During Removal and Installation of Piping | 12 | Hydraulic Hose Installation |
| Handling of Seals | 13 | O-Ring Handling |
| Tightening Torques and General Specifications | 14-24 | Hydraulic Hose Fittings, Pipe Fittings, ISO Strength Category 10.9 Bolts, Machine Dimensions, Lifting Capacities |
| Hydraulic Unit Specifications and Fluid Capacities | 25-26 | Main Relief Valve Settings, Travel Motor Displacement, Slew Motor Displacement, Hydraulic Pump Displacement, Fluid Capacities |
| Performance Check Judgment Standards | 27-35 | Travel Speed, Travel Curve, Slewing Time, Cylinder Natural Fall, Swing Cylinder Natural Fall |
| General Check Judgment Standards | 36-44 | Lever Operating Force, Slew Bearing Backlash, Crawler Belt Tension, Pin and Bushing Wear, Bucket Tooth Wear |
| Lubricants and Hydraulic/Electrical Diagrams | 45-52 | Recommended Lubricants, Hydraulic System Diagrams, Electrical Wiring Diagrams |
| Disassembly and Reassembly Procedures | 53-108 | Lower Machinery, Hoe Attachment, Upper Machinery, Swivel Joint, Slew Bearing |
| Hydraulic Units Structure and Operation | 109-206 | Hydraulic Tank, Hydraulic Pump, Relief Valve, Control Valve, Travel Motor, Slew Motor, Swivel Joint |
| Troubleshooting Procedures | 207-258 | Entire Machine, Travelling, Slewing, Boom, Arm, Bucket, Boom Swing, Dozer Blade |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Main Relief Valve Settings (S/N 00103 ~ 00834) P1, P2 | 190 kgf/cm² @ 22 l/min | p. 25 |
| Main Relief Valve Settings (S/N 00103 ~ 00834) P3 | 150 kgf/cm² @ 22 l/min | p. 25 |
| Hydraulic Oil Tank Capacity | 59 l | p. 26 |
| Hydraulic Oil Total System Capacity | 72 l | p. 26 |
| Steel Crawler Belt Tension | 125 ~ 145 mm | p. 38 |
| Rubber Crawler Belt Tension | 105 ~ 110 mm | p. 38 |
| Grease amount for spline | 50 cc | p. 90 |
| Main Relief Valve Setting (P1, P2) (S/N 00103-00834) | 190 kgf/cm² @ 22 l/min | p. 25 |
| Main Relief Valve Setting (P3) (S/N 00103-00834) | 150 kgf/cm² @ 22 l/min | p. 25 |
| Fuel Tank Capacity | 40 l | p. 26 |
| Cooling System Capacity | 5.5 l | p. 26 |
| Travel Motor Reduction Gear Capacity | 600 cc | p. 26 |
Takeuchi TB25 Common Problems This Manual Covers
Takeuchi TB25 excavator hydraulic system dead, boom, arm, bucket, travel and slew operations not possible
Check the hydraulic oil level first. If it is low, loosen plug (A) to release tank pressure, remove plug (B) and top up with the same brand already in the machine; page 45 says do not mix brands. If the level is good, remove and plug the main pump discharge hoses, then crank on the starter with the throttle at engine stop per page 212. No flow, or flow that stops against your palm, means a defective pump or coupling.
Manual Section: Entire Machine Troubleshooting p. 212Hydraulic pump makes abnormal noise, all functions operate but have no power
Check the oil level, then inspect the suction piping for air suction by smearing grease or oil on suspect joints and listening for a change. Check the suction filter for clogging. Next ground the dozer blade, extend the other cylinders and turn the relief valve adjusting screw gradually clockwise toward 210 kg/cm² per page 214. No pressure rise after 1/4 turn means a defective relief valve.
Manual Section: Entire Machine Troubleshooting p. 214One track will not move, right or left travel not possible while boom and arm work
Test other functions first: operate the boom if right travel is dead, the arm if left travel is dead; weakness there points to the relief valves and pump. Otherwise verify 6.0 mm spool stroke per page 217, check the return spring bolt and spool to yoke linkage, and measure travel pressure against 190 kg/cm². Then check the brake valve plunger; one stuck at neutral blocks travel.
Manual Section: Travelling Troubleshooting p. 217Excavator does not travel straight, speed of the right or left crawler has dropped
Measure curvature: up to 70 cm over 10 m on hard, level ground is normal per page 220. Check crawler belt tension (125 to 145 mm steel, 105 to 110 mm rubber, page 38). Swap the first and second pump discharge hoses; a reversed curve means a bad pump. Measure travel motor drain at 50 to 60°C oil and rated engine speed against 1200 cm³ per minute.
Manual Section: Travelling Troubleshooting p. 220Travel will not shift up, travel does not accelerate with the accelerator pedal pressed
Verify spool stroke at 6.7 mm and check that the yoke moves with the snap pin and pin pulled. Disconnect the sub-valve to swivel joint hose, fit a pressure gauge, step the travel accelerator pedal and confirm 26 to 30 kg/cm² per page 224. Repeat at the swivel joint to accel selector valve hose; if pressure is good, check the accelerator valve plunger for sticking or foreign matter.
Manual Section: Travelling Troubleshooting p. 224Upper structure will not slew at all while bucket and right travel still operate
Verify the selector lever is on the slewing side, then fit a gauge on the joystick lever discharge port with the lever stand ON and check sequence valve pressure at 26 to 30 kg/cm² per page 227. Measure joystick secondary pressure (0 to 20 kg/cm² depending on lever angle). Remove the brake valve plugs and push the plunger by hand; a plunger stuck at neutral stops slewing both ways.
Manual Section: Slewing Troubleshooting p. 227Frequently Asked Questions
What are the hydraulic pressure specifications for the Takeuchi TB25?
For machines with serial numbers 00103 to 00834, the main relief valve settings for P1 and P2 are 190 kgf/cm² (2702 psi) at 22 l/min, and P3 is 150 kgf/cm² (2134 psi) at 22 l/min. Port relief valve settings are 240 kgf/cm² (3414 psi). p. 25
What are the tightening torque specifications for hydraulic hose fittings on the Takeuchi TB25?
Tightening torques for hydraulic hose fittings depend on the thread size. For a 1/2 inch union nut (PF), the torque is 6.0 kgf-m (43.4 ft-lb), and for a 1/2 inch taper thread (PT), it is 9.0 kgf-m (65.1 ft-lb). p. 14
What is the recommended interval for changing the hydraulic oil on a Takeuchi TB25?
The hydraulic oil should be changed every 1,000 hours of operation. When the oil is dirty or has deteriorated, it should be replaced at shorter intervals than this. p. 45
What is the standard crawler belt tension for the steel crawler?
The standard tension for the steel crawler belt is 125 to 145 mm. This is measured as the clearance (B) between the frame undersurface in the center of the crawler frame and the top surface of the crawler shoe. p. 38
How do you check the hydraulic oil level?
Check the oil level with the arm cylinder and bucket cylinder each fully retracted and with the bucket and blade resting on the ground. The oil level should be within the appropriate range indicated on the gauge. p. 113
How is this Takeuchi TB25 Shop Manual delivered?
A single searchable PDF file of 258 pages, downloadable right after payment. Nothing ships, nothing waits in the mail.
Am I able to print pages from this Takeuchi TB25 manual?
Yes. It prints from any PDF reader, so run off the pages you need for your own repair work.
