A TL12 that pulls to one side on a loaded push points straight at the drive circuit, and this 418-page Takeuchi TL12 service manual PDF (factory publication CU7E006) for the track loader is where your diagnosis starts. Hydraulic circuit diagrams trace oil through the control valve, standard and high flow, out to the lift arm and bucket cylinders, while wiring diagrams lay out the electrical circuits. Disassembly and assembly fills the biggest share of the book, covering the HST pump, drive system, frame and attachments, followed by troubleshooting sorted by traveling, lift arm and bucket faults, plus air conditioner service. Check charge pressure at 2.3 MPa low and 2.4 MPa high (334/363 psi), then confirm 34.5 MPa (5003 psi) on each forward travel circuit. A guessed relief setting can split a hose. Chapter bookmarks and a searchable text layer take you from the cover to the arm and bucket relief figures in two clicks.
What's Inside This Manual
| System | Pages | Key Topics |
|---|
| Safety | 3-12 | |
| Service Data | 13-79 | Specification Tables, Performance Criteria, Tightening Torque, Hydraulic Circuit Diagram |
| Function | 80-112 | Control Valve, Control Valve High Flow |
| Disassembly and Assembly | 113-129 | Service Standards, Drive System, Travel System |
| Frame | 130-164 | Operating Device, Attachments, Hydraulic Tank |
| HST Pump and Gear Pumps | 165-227 | HST Pump, Gear Pump, Gear Pump (High Flow), Test Operation |
| Control Valve | 228-254 | Control Valve (High-Flow), Sub Valve, Pilot Valve, Proportional Control Solenoid Valve |
| Cylinders | 255-269 | Piston Rod Assembly, Rod Cover, Special Tools, Inspection After Assembly |
| Travel Motor | 270-291 | Hydraulic Motor, Planetary Gear, Brake Piston, Floating Seals, Special Tools |
| Troubleshooting | 292-331 | Overall Machine, Traveling, Lift Arm, Bucket |
| Other | 332-418 | Air Conditioner, Air Conditioner System Red Dot, Maintenance Software Manual |
Quick Reference Specifications
| Specification | Value | Page |
|---|
| Track tension | 25 to 50 mm (1.0 to 2.0 in.) | p. 21 |
| Right travel (forward) pressure | 34.5 MPa (5003 psi) | p. 23 |
| Left travel (forward) pressure | 34.5 MPa (5003 psi) | p. 23 |
| Parking brake torque | 363 N·m (267.7 ft.-lb.) | p. 36 |
| Parking brake release pressure | 1.5 MPa (218 psi) | p. 36 |
| Track roller A Standard dimension | 216 mm (8.5 in.) | p. 114 |
| Track roller A Allowable value | 208 mm (8.2 in.) | p. 114 |
| Sprocket A Standard dimension | 410 mm (16.1 in.) | p. 114 |
| Sprocket A Allowable value | 402 mm (15.8 in.) | p. 114 |
| Idler A Standard dimension | 450 mm (17.7 in.) | p. 114 |
| Idler A Allowable value | 440 mm (17.3 in.) | p. 114 |
| Crawler belt weight | 255 kg (562 lb) | p. 127 |
