Getting a WB140-2 or WB150-2 backhoe loader through a transmission overhaul right the first time is what you buy with the 509 pages of this Komatsu WB140-2, WB150-2 shop manual PDF, publication WEBM001102. Wiring diagrams trace the electrical circuits, hydraulic schematics map oil flow from the pump through the control valve block, and nearly a fifth of the book explains how the power train works before you pull a bolt. Disassembly and assembly fills more than half the manual: starting motor, injection pump, transmission dismantling, front and rear axles, final drives and the backhoe and loader cylinders, backed by Testing and Adjusting checks and Maintenance Standard wear limits. Set the max pressure valve at 23 bar (333.6 psi) and run 8 mm grade 8.8 bolts to 23 ± 2 Nm. A wrong guess on clutch clearance costs you a second teardown. Search the text, jump between bookmarked sections, and have that WB150-2 back on the job sooner.
What's Inside This Komatsu WB140-2, WB150-2 Manual
| System | Pages | Key Topics |
|---|
| Structure and Function | 18-103 | Power Train, Control Valve Block, Hydraulic Pump |
| Testing and Adjusting | 104-174 | Engine Speed, Hydraulic Drift |
| General Information and Special Tools | 175-181 | Manual Reading, Safety Precautions, Special Tools List |
| Engine and Power Train Components | 182-231 | Starting Motor, Alternator, Injection Pump, Transmission Removal and Installation |
| Transmission Overhaul | 232-275 | Transmission Dismantling, Input Shaft, Secondary Shaft, Clutch Function Testing |
| Axle and Final Drive Components | 276-384 | Boom Swing Cylinder, Front Axle Disassembly, Rear Axle Final Drive, Differential Locking |
| Hydraulic Cylinders and Working Equipment | 385-468 | Differential Lock Assembly, Backhoe Boom Cylinder, Front Bucket Tilt Cylinders, Backhoe Working Equipment |
| Maintenance Standard | 469-509 | Transmission, Front Axle, Brakes |
Quick Reference Specifications
| Specification | Value | Page |
|---|
| Standard Tightening Torque (6mm bolt, 8.8 grade) | 9.5 ± 1 Nm | p. 8 |
| Standard Tightening Torque (8mm bolt, 8.8 grade) | 23 ± 2 Nm | p. 8 |
| Standard Tightening Torque (6mm bolt, 10.9 grade) | 13.5 ± 1.5 Nm | p. 8 |
| Standard Tightening Torque (8mm bolt, 10.9 grade) | 32.2 ± 3.5 Nm | p. 8 |
| Max. pressure valve | 23 bar (333.6 psi) | p. 22 |
| Front shovel control valve nominal pressure | 206 ± 8 bar (2987 ± 116 psi) | p. 149 |
| Standard tightening torque for 6mm bolt (8.8) | 9.5 ± 1 Nm | p. 10 |
| Standard tightening torque for 24mm bolt (10.9) | 905 ± 98 Nm | p. 10 |
| Engine oil pan capacity (WB140-2 Aspirated) | 8.6 L | p. 15 |
| Engine oil pan capacity (WB140-2 Turbocharged) | 7.9 L | p. 15 |
| Hydraulic system capacity | 150 L | p. 15 |
| Fuel tank capacity | 130 L | p. 15 |
