A slipping transmission or slow lift arms on your wheel loader is today's job, and this Komatsu WA450-3 shop manual PDF answers it with 854 pages of factory data (form CEBM003602) for both the standard machine and the -3MC. Hydraulic schematics trace oil from the pump through the main control valve to the lift and bucket cylinders, and the wiring diagrams at the back map the electrical circuits. Troubleshooting fills nearly a fifth of the book, working through engine, electrical, transmission controller and ECSS faults, while disassembly and assembly takes over a third, from the torque converter to the hydraulic cylinders. Set main relief to 210 +10/-3 kg/cm² at high idle with oil at 45 to 55 °C, then confirm clutch pressure holds 23 ± 2 kg/cm². Alone with the loader, there's nobody to ask. Bookmarked and text-searchable, the file is yours after one purchase, for as long as your loader runs.
What's Inside This Manual
| System | Pages | Key Topics |
|---|
| Foreword | 2-13 | Contents, Product Publications, Revised Edition Mark, Symbols |
| Safety | 14-15 | General Precautions, Preparations for Work, Precautions During Work |
| General | 16-43 | How to Read Shop Manual, Hoisting Instructions, Coating Materials, Standard Tightening Torque, Electric Wire Code, Conversion Tables |
| Structure and Function | 44-250 | Power Train, Transmission, Steering Valve, Brake Piping, Hydraulic Piping, Work Equipment, ECSS, Machine Monitor System |
| Testing and Adjusting | 251-310 | Standard Value Tables, Engine Speed, Intake Air Pressure, Valve Clearance, Stall Speed, Brake Performance, Load Meter |
| Troubleshooting | 311-467 | Troubleshooting Sequence, Engine System, Electrical System, Transmission Controller System, ECSS System |
| Disassembly and Assembly | 468-792 | Starting Motor, Radiator, Engine, Torque Converter, Transmission, Parking Brake, Main Control Valve, Hydraulic Cylinders |
Quick Reference Specifications
| Specification | Value | Page |
|---|
| Mounting bolt torque for turbine and case assembly to stator shaft and pump assembly | 30.9 ± 3.4 N•m (22.8 ± 25.1 lbf ft) | p. 511 |
| Mounting bolt torque for turbine (6) to case (7) | 30.9 ± 3.4 N•m (22.8 ± 25.1 lbf ft) | p. 511 |
| Slow blow fuse | 80 amp, 120 amp, 30 amp | p. 221 |
| Fuse | 10 amp | p. 221 |
| Clutch pressure | 23 ± 2 kg/cm² | p. 253 |
| Main control valve relief pressure | 210 +10/-3 kg/cm² | p. 255 |
| Specified dimension c | 3.8 ± 0.2 mm | p. 270 |
| Clearance between cam (3) and roller (4) | 0 to 0.5 mm | p. 297 |
| Dimension b (roller at notch at both ends of cam) | 0 to 1 mm | p. 297 |
| Voltage between E19-1 and chassis ground | 20 to 30 V | p. 396 |
| Engine Oil Capacity (Refill) | 38 L | p. 37 |
| Torque Converter/Transmission Oil Capacity (Refill) | 60 L | p. 37 |
