Getting a Komatsu WB146-5 backhoe loader through a transmission or axle rebuild on the first attempt is the job these 586 pages of Komatsu shop manual CEBM016503 were written for. Transmission overhaul alone fills close to a fifth of this Komatsu WB146-5 service manual PDF, taking the torque converter, clutch packs, gear shafts and valve body apart and back together, while engine removal and both axle overhauls take nearly as much again. Testing and troubleshooting get a section of their own, built around a standard value table and a troubleshooting guide covering the brake system and relief valves. Set main control valve pressure at 249 kg/cm² (permissible 238 to 264), and expect 178 kg/cm² at the steering unit; boom cylinder piston nuts take 1800 to 2200 Nm. A guessed torque means a second teardown. Bookmarked by section and fully text searchable, this copy is yours to keep and reopen every time your WB146-5 comes in for work.
What's Inside This Komatsu WB146-5 Manual
| System | Pages | Key Topics |
|---|
| General | 29-40 | Specification Drawing, Machine Systems Specifications |
| Structure, Function and Maintenance Standard | 41-136 | Power Train, Transmission, Hydraulic Pump, Main Control Valve, Clss |
| Testing, Adjusting and Troubleshooting | 137-206 | Standard Value Table, Brake System, Relief Valves, Troubleshooting Guide |
| General Disassembly and Assembly Procedures | 207-227 | Manual Usage, Safety Precautions, Special Tools, Connector Repair, Bleeding Air |
| Engine and Cooling System Components | 228-259 | Engine Hood, Radiator, Muffler, Air Filter, Turbocharger, Refrigerant Compressor, Fuel Tank |
| Cab, Steering, and Hydraulic Tank | 260-284 | Steering and Dash Assembly, Cab Removal, Hydraulic Oil Tank, Hydraulic Pump |
| Transmission Overhaul | 285-396 | Transmission Removal, Torque Converter, Clutch Packs, Gear Shafts, Valve Body, 4WD Solenoid Valve |
| Engine and Axle Assemblies | 397-499 | Engine Removal, Front Axle Assembly, Front Axle Overhaul, Rear Axle Assembly, Rear Axle Overhaul |
| Work Equipment and Cylinders | 500-560 | Front Loader PPC Valve, Front-End Loader Assembly, Backhoe PPC Valve, Backhoe Assembly, Work Equipment Cylinder Overhaul |
| Others | 561-586 | Hydraulic Circuit, Electrical Schematic |
Quick Reference Specifications
| Specification | Value | Page |
|---|
| Tightening torque of hose nuts (Nominal No. 02) | 19.6 - 29.4 Nm | p. 20 |
| Tightening torque of hose nuts (Nominal No. 03) | 29.4 - 68.6 Nm | p. 20 |
| Main valve pressure (Control valve) | 249 kg/cm² (Permissible: 238 - 264 kg/cm²) | p. 141 |
| Steering unit pressure | 178 kg/cm² (Permissible: 173 - 188 kg/cm²) | p. 141 |
| Boom Cylinder Piston Nut Torque | 1800 ~ 2200 Nm (1328 ~ 1623 ft/lbs) | p. 114 |
| Boom Cylinder Head Torque | 630 ~ 770 Nm (465 ~ 568 ft/lbs) | p. 114 |
| Hydraulic oil capacity | Approximately 40 liters (10.5 gal) | p. 275 |
| Drive shaft bolts | 38 ± 1 N·m (28 ± 1 lbf ft) | p. 284 |
| Pump bolts | 220 N·m (162 lbf ft) | p. 284 |
| Drive plate thickness | 2.5 ± 0.05 mm (0.098 ± 0.002 in) | p. 352 |
