This manual covers the Komatsu WA800-3LC, also known as the WA 800 Avance, a robust Wheel Loader designed for demanding operational environments. Built with Komatsu's renowned engineering, this model, identified by serial numbers A50001 and up, features a powerful Cummins QSK19-C engine delivering 330 kW (443 hp) of net power and an advanced electronic control transmission. Its substantial operating weight of approximately 48,000 kg and impressive dimensions make it a reliable choice for heavy-duty material handling tasks, reflecting a commitment to durability and performance in its class. The purpose of this Service Repair Workshop Manual is to provide comprehensive guidance for the maintenance, repair, and technical understanding of the Komatsu WA800-3LC Wheel Loader. It details essential information including engine and transmission specifications, fluid capacities, recommended service intervals, and fluid types. This manual serves as an indispensable resource for owners, mechanics, and technicians, enabling them to perform routine maintenance, diagnose issues, and execute repairs effectively, ensuring the longevity and optimal performance of the equipment.