This Service Repair Workshop Manual provides comprehensive information for the Komatsu WA-5 Series wheel loaders, specifically covering models WA65-5, WA70-5, and WA80-5, for serial numbers H50051 and up. These machines are engineered for demanding operational environments, offering robust performance and reliability. With their versatile design, they are well-suited for a range of applications in construction, material handling, and general site work. The series is characterized by its efficient power delivery, durable construction, and operator-focused features designed to maximize productivity and minimize downtime. This manual serves as an essential resource for owners, technicians, and mechanics. It details critical maintenance procedures, troubleshooting guides, and technical specifications necessary for the upkeep and repair of your Komatsu wheel loader. Covered sections include safety protocols, general information, structure and function analysis, testing and adjusting procedures, and disassembly and assembly instructions. By following the guidelines within this document, users can ensure their equipment operates at peak performance and longevity, adhering to factory standards.