This Service Shop Repair Manual covers the Komatsu WA400-5 Wheel Loader, serial number 70001 and up. Engineered for heavy equipment applications, this machine is designed for robust performance and reliability in demanding work environments. Its intended use encompasses maintenance, assembly, disassembly, and servicing, ensuring optimal operational efficiency. The WA400-5 is equipped with the SAA6D114E-2 engine, a testament to Komatsu's commitment to powerful and dependable machinery. This comprehensive English-language manual provides detailed information essential for the upkeep and repair of your Komatsu WA400-5. It includes technical specifications, diagrams, real photo illustrations, and step-by-step procedures for repair, servicing, maintenance, and troubleshooting. The manual is structured to enable users to identify and resolve issues, perform necessary adjustments, and conduct disassembly and assembly tasks independently, thereby facilitating cost savings and ensuring the machine remains in optimal working condition.