This Service Repair Manual provides comprehensive information for the Komatsu WA320-6 and WA320PZ-6 Wheel Loaders, designed for robust performance in demanding work environments. These machines are engineered with advanced features, including a SAA6D107E-1 engine, a power shift transmission, and a Z-bar linkage for efficient material handling. Their construction emphasizes reliability and durability, ensuring consistent operation and productivity across a wide range of applications. This manual serves as an essential resource for maintaining and repairing your Komatsu wheel loader. It covers critical areas such as detailed specifications, structure and function explanations, maintenance standards, testing and adjustment procedures, and disassembly and assembly instructions. With integrated troubleshooting guidance for engine, hydraulic, electrical systems, and failure code diagnosis, this document empowers owners, mechanics, and technicians to effectively service the WA320-6 and WA320PZ-6 models, ensuring optimal performance and longevity.