This Shop Manual and Factory Service Manual covers the Komatsu WA900-3 Wheel Loader, serial number A50001 and up. Designed for material handling and construction applications, this heavy equipment is engineered for robust performance and reliability. The WA900-3 embodies Komatsu's commitment to quality, offering powerful capabilities for demanding operational environments. This comprehensive manual provides essential information for maintaining and repairing the Komatsu WA900-3. It details foreword, general information, structure and function, testing, adjusting, troubleshooting, disassembly, assembly, maintenance standards, and includes shop manual foldouts with diagrams. With easy-to-read text, high-quality illustrations, step-by-step instructions, specifications, tolerances, and component function explanations, this 937-page English-language guide is an indispensable resource for fault finding, repair, and overhaul procedures.