This Service Repair Manual covers the Komatsu WA400-5H Wheel Loader, serial numbers H50051 and up. Engineered for demanding applications in construction and material handling, the WA400-5H is designed for robust performance and reliability. Its advanced features and durable construction ensure efficient operation in challenging environments, making it a trusted choice for heavy equipment needs. This comprehensive manual provides detailed information essential for the maintenance and repair of your Komatsu WA400-5H. It includes critical sections on safety, general information, structure and function, testing and adjusting, disassembly and assembly, and an appendix. This resource is designed to assist both do-it-yourself enthusiasts and experienced mechanics in understanding, maintaining, and servicing the equipment effectively.