This manual covers the Komatsu WA400-5 Wheel Loader, serial numbers 70001 and up. Engineered for demanding tasks, this machine represents a commitment to robust performance and operational efficiency. Its design prioritizes reliability and durability, making it a dependable asset for various construction and material handling applications. The WA400-5 is built to meet the rigorous standards expected in its class, ensuring it can perform its intended functions effectively and consistently. This comprehensive Service Repair Manual and Operation & Maintenance Manual provides essential information for the proper care and upkeep of your Komatsu WA400-5. It details procedures for maintenance, assembly, disassembly, servicing, operation, handling, lubrication, checking, and adjustment. Within its pages, you will find technical specifications, safety guidelines, and troubleshooting information designed to assist owners, mechanics, and technicians in maintaining optimal performance and longevity of the equipment.