The Komatsu WA1200-3 Wheel Loader is a robust and powerful machine designed for heavy-duty applications. Featuring a Komatsu SAA6D170E-3 diesel engine, this loader delivers substantial net power of 407 kW (546 HP) and is equipped with the Komatsu Advanced Transmission (KAT) for efficient operation. Its substantial operating weight of approximately 75,000 kg and a bucket capacity of around 9.5 m³ make it ideal for demanding tasks in mining, quarrying, and large-scale construction. The WA1200-3 is engineered for reliability and performance in challenging environments. This manual serves as a comprehensive guide for the Komatsu WA1200-3 Wheel Loader, covering essential information for maintenance, repair, and assembly. It details technical specifications, fluid capacities, and service schedules, including engine oil change intervals and hydraulic filter replacement. The manual also provides insights into the hydraulic system, cooling system, and transmission, offering procedures and data necessary for optimal performance and longevity. This resource is intended for owners, mechanics, and technicians to ensure proper upkeep and efficient operation of the WA1200-3.