This workshop service repair manual covers the Komatsu WA450-3MC wheel loader, serial numbers A31001 and up. Engineered for demanding operational environments, this machine features a robust Komatsu SAA6D125E-3 turbocharged, water-cooled, 4-cycle diesel engine producing 220 HP, coupled with a Komatsu Dynamic-Type Transmission offering 4 forward and 4 reverse gears. Its substantial operating weight of approximately 23,000 kg and a standard bucket capacity of 3.1 m³ make it a powerful and reliable tool for heavy-duty material handling tasks. The machine's design emphasizes durability and efficiency, ensuring consistent performance across a wide range of applications. This comprehensive English-language manual provides essential information for maintaining and repairing the Komatsu WA450-3MC. It includes detailed step-by-step repair procedures, explanations, and a wealth of pictorial diagrams, exploded views, and photos to guide users through every task. Technical data, including service specifications, tightening torques, and wear limits, is readily available. The manual also features extensive troubleshooting guidance, routine maintenance schedules, and critical safety precautions, marked with DANGER, CAUTION, and NOTE indicators. This resource is invaluable for owners, mechanics, and technicians seeking to ensure the optimal performance and longevity of their equipment.