This workshop manual covers the Komatsu WA800-3 Wheel Loader, serial number prefix 50001 and up. Designed for demanding operational environments, the WA800-3 represents robust engineering and reliable performance. Its advanced features and powerful capabilities make it a versatile machine for heavy-duty applications. This factory-produced workshop manual provides comprehensive guidance for maintaining and repairing the Komatsu WA800-3. It includes detailed step-by-step instructions for fault finding, disassembly, assembly, and overhaul, supported by top-quality diagrams, pictures, and illustrations. All necessary specifications and tolerances are listed, along with explanations of component functions, ensuring that owners, mechanics, and technicians have the resources needed to keep the machine operating at peak efficiency. The manual covers all major systems, including the powertrain, axles, steering, braking, and work equipment hydraulics.