The Komatsu WA320-6 and WA320PZ-6 Wheel Loaders, designed for demanding work environments and serial numbers 70001 and up, represent robust engineering and reliable performance. These machines are equipped with a powerful Komatsu SAA6D107E-1 turbocharged, aftercooled, direct injection diesel engine, delivering 175 HP gross power and featuring the advanced Komatsu Advanced Transmission with Lock-up Torque Converter (K-ATSC) for efficient operation. With a substantial operating weight of 22,267 kg and a bucket capacity ranging from 3.0 to 4.5 m³, these wheel loaders are built for productivity in construction, material handling, and other heavy-duty applications, showcasing Komatsu's commitment to quality and durability. This manual provides comprehensive guidance for the maintenance, repair, and operation of the Komatsu WA320-6 and WA320PZ-6 Wheel Loaders. It covers essential information including specifications, structure and function, standard values, testing and adjusting procedures, troubleshooting, disassembly and assembly, maintenance standards, and detailed diagrams. The manual is designed to assist owners, technicians, and mechanics in ensuring the optimal performance, longevity, and safety of their equipment, offering detailed instructions and technical data necessary for effective service and upkeep.