This service repair manual covers Komatsu wheel loaders, models WA470-5H and WA480-5H, for serial numbers WA470H50051 and up, and WA480H50051 and up. These robust machines are engineered for demanding work environments, featuring powerful Komatsu SAA6D125E-3 turbocharged, aftercooled diesel engines with gross power outputs around 330 HP for the WA480-5H and 290 HP for the WA470-5H. They are equipped with the Komatsu Advanced Transmission with Lock-up (K-ATLS) offering 4 forward and 4 reverse gears, hydrostatic power steering, and ROPS/FOPS certified cabs with air conditioning for operator comfort and safety. Their substantial operating weights and large bucket capacities, approximately 4.0 m³ for the WA470-5H and 4.5 m³ for the WA480-5H, make them ideal for heavy-duty material handling and construction applications. The purpose of this manual is to provide comprehensive guidance for the maintenance and repair of the Komatsu WA470-5H and WA480-5H wheel loaders. It details essential procedures across key areas including safety protocols, general information, structure and function of components, testing and adjustment methods, and disassembly and assembly instructions. Additionally, an appendix is included for further reference. This manual serves as an indispensable resource for owners, mechanics, and technicians, enabling them to perform routine maintenance, diagnose issues, and execute repairs effectively, ensuring the continued optimal performance and longevity of the equipment.