This document provides comprehensive information for the Komatsu WA500-3H wheel loader, serial numbers WA500H 20051 and up. Engineered for demanding applications, this machine features a powerful Komatsu SAA6D140E-3 diesel engine delivering 210 kW (282 HP) and a robust Planetary Gear Type Automatic Transmission with 4 forward and 4 reverse gears. Its substantial operating weight of 26,400 kg, 4.5 m³ bucket capacity, and impressive full turn tip load of 17,470 kg underscore its capability in heavy-duty material handling operations. The WA500-3H is built with Komatsu's renowned commitment to reliability and performance, making it a dependable asset for construction and industrial sites. This Workshop Service Repair Manual in English is designed to be an essential resource for maintaining and repairing your Komatsu WA500-3H. It covers a wide range of topics including general information, structure and function, testing, adjusting, troubleshooting, disassembly, assembly, and standard maintenance procedures. Detailed technical specifications, lubrication capacities, and performance data are also included to aid in proper operation and upkeep. This manual will assist owners, mechanics, and technicians in understanding the machine's systems and ensuring its optimal performance and longevity through accurate maintenance and repair practices.