This workshop manual provides comprehensive information for the Komatsu WA400-5h wheel loader, serial number WA400H50051 and up. Engineered for demanding applications, this diesel-powered, all-wheel-drive machine is built for reliability and performance. Its robust construction and advanced design ensure efficient operation in various work environments, making it a trusted choice for heavy-duty tasks. This factory service manual is your definitive guide for the repair, overhaul, and fault finding of the Komatsu WA400-5h. It contains detailed, step-by-step instructions, accompanied by high-quality diagrams, pictures, and illustrations, to ensure correct and efficient repairs. The manual covers all necessary technical specifications, tolerances, and explanations of component functions, empowering owners, mechanics, and technicians to maintain the vehicle's optimal performance and longevity.