This manual covers the Komatsu WA800-3E0 and WA900-3E0 wheel loaders, designed for demanding heavy-duty applications. These machines are engineered for exceptional performance, reliability, and operational efficiency, making them a cornerstone in construction, mining, and material handling operations. Their robust construction and advanced features ensure productivity and longevity in challenging environments. This comprehensive Service Repair Factory Manual provides essential information for maintaining and repairing your Komatsu wheel loader. It details specifications, structure, function, maintenance standards, testing, adjusting, troubleshooting, disassembly, and assembly procedures. The manual also includes diagrams, drawings, and field assembly instructions, offering a complete resource for owners, technicians, and mechanics to ensure optimal performance and longevity of the WA800-3E0 (serial numbers 70001 and up) and WA900-3E0 (serial numbers 60001 and up) models.