This manual covers the Komatsu WA450-3MC Wheel Loader, applicable to serial numbers A31001 and up. Designed for robust performance in demanding environments, this machine embodies Komatsu's commitment to engineering excellence and reliability. Its advanced design and powerful components ensure efficient operation for a wide range of material handling tasks. This comprehensive Repair Service Manual / Workshop Manual provides essential information for mechanical technicians. It details routine maintenance, diagnostic procedures, component repair, and overhaul instructions for various systems, including fuel, lubrication, electrical, and transmission. The manual emphasizes safety precautions and uses specific notations like WARNING, CAUTION, and NOTE to ensure accuracy and help users achieve the best value from their machine through informed repairs.