This Service Shop Repair Manual covers the Komatsu WA420-3MC Wheel Loader, serial number range A31001 and up. Engineered for demanding applications, this machine represents a commitment to robust performance and operational efficiency. Its design prioritizes reliability and durability, ensuring consistent productivity across various work environments. This comprehensive English-language manual provides detailed information essential for the maintenance and repair of your Komatsu WA420-3MC. It includes step-by-step procedures for assembly, disassembly, servicing, testing, adjusting, and troubleshooting, supported by actual photo illustrations and diagrams. The manual is designed to empower owners and technicians to perform necessary upkeep and repairs, enhancing the longevity and performance of the equipment.