This manual covers the Komatsu WA900L-3 Wheel Loader, designed for heavy-duty industrial and construction applications. Known for its robust engineering and reliability, the WA900L-3 is equipped with a powerful SAA12V140ZE-2 diesel engine. This service shop repair manual provides comprehensive information for maintaining and servicing this formidable piece of equipment, ensuring its continued operational efficiency and longevity in demanding environments. The purpose of this English-language Service Shop Repair Manual is to provide detailed instructions and technical specifications for the Komatsu WA900L-3 Wheel Loader, serial numbers 52001 and up. It includes essential information on general maintenance, structure and function, testing and adjusting, disassembly and assembly, maintenance standards, and troubleshooting. With step-by-step operations, diagrams, and photo illustrations, this manual is designed to assist owners, mechanics, and technicians of all skill levels in performing repairs and maintenance effectively, saving time and resources.