This manual covers the Komatsu WA450-3 Wheel Loader, a robust machine designed for demanding work. Built with Komatsu's renowned engineering, this generation of wheel loader offers exceptional reliability and performance. Its powerful Komatsu SAA6D125E-2 engine, a turbocharged, air-to-air aftercooled diesel, delivers a gross power of 207 kW (278 HP). The machine features a Komatsu Advanced Transmission with Lock-up, providing 4 forward and 4 reverse gears for efficient operation. With an operating weight of 22,500 kg and a bucket capacity of 4.5 m³, the WA450-3 is engineered for productivity in various heavy-duty applications. This Full Service Repair Manual in English provides comprehensive guidance for maintaining and repairing the Komatsu WA450-3 Wheel Loader. It details essential procedures, including engine oil and transmission fluid changes, along with fluid capacities for engine oil, coolant, and hydraulic systems. Technical specifications covering dimensions, performance figures such as rated load and maximum dump height, and operational features like articulated steering and a ROPS/FOPS certified cab are included. This manual is an indispensable resource for owners, mechanics, and technicians to ensure the optimal performance and longevity of the equipment.