This manual covers the Komatsu WA320-6 and WA320PZ-6 (KA SPEC.) Wheel Loaders, designed for heavy equipment applications. These machines are engineered for robust performance and reliability in various operational tasks. This documentation is intended to support the maintaining, assembly, disassembly, servicing, operation, and maintenance of these specific wheel loader models, ensuring they operate at peak performance. The scope of this manual encompasses both Service Repair and Operation & Maintenance procedures. It provides comprehensive guidance on specifications, structure and function, maintenance standards, standard values, testing and adjusting, troubleshooting, disassembly and assembly, and diagrams. Detailed information on safety, operation, and maintenance is also included. This resource is designed to empower owners, mechanics, and technicians with the knowledge to effectively maintain, repair, and operate these Komatsu wheel loaders, enabling them to perform tasks independently and efficiently.