The Komatsu WA800-3 Wheel Loader is engineered for heavy-duty material handling, loading, and excavation tasks. Designed for peak performance, this machine prioritizes efficiency, economy, and safe operation. Its robust construction and advanced features ensure reliability in demanding environments, making it a trusted choice for large-scale operations. This comprehensive manual, covering Service Repair, Field Assembly, and Operation & Maintenance, provides essential information for owners, mechanics, and technicians. It details general procedures, structure and function, testing, disassembly, assembly, maintenance standards, and troubleshooting for serial numbers 50001 and up. The manual includes guidance on wear parts, lubrication, tightening torques, safety-critical part replacement, and the selection of optional parts and attachments, empowering users to maintain and repair the WA800-3 effectively.