This Service Repair Factory Manual covers the Komatsu WA400-5H Wheel Loader, serial numbers WA400H50051 and up. Engineered for demanding applications, the WA400-5H is a robust and reliable piece of equipment designed for efficiency and performance. Its advanced diesel engine and automatic transmission system are built to deliver consistent power and smooth operation across various work environments, making it an indispensable tool for construction and material handling tasks. This comprehensive manual provides essential information for maintaining and repairing your Komatsu WA400-5H. It details crucial procedures for safety, general operation, structure and function, testing and adjustment, and disassembly and assembly. Technicians and owners will find detailed guidance on scheduled maintenance, fluid capacities, lubricant specifications, and other critical technical data necessary to ensure the longevity and optimal performance of the wheel loader.