This workshop service repair manual covers the Komatsu WA250-5, WA250L-5, WA250PT-5, and WA250PTL-5 series wheel loaders. These machines are engineered for robust performance and reliability in various demanding applications. Featuring a powerful diesel engine and a hydrostatic transmission, the WA250-5 series offers versatile operation with articulated steering and optional parallel lift capabilities. This manual provides comprehensive information to ensure optimal functionality and longevity of your equipment. The purpose of this manual is to serve as a complete guide for the maintenance, repair, and technical understanding of the specified Komatsu wheel loaders. It details essential procedures, troubleshooting steps, technical specifications, and safety guidelines. Owners, mechanics, and technicians will find the information within this English-language manual invaluable for performing routine servicing, diagnosing issues, and executing repairs effectively, ensuring the continued efficient operation of the WA250-5 series.