This Service Shop Repair Manual covers the Komatsu WA300-1 and WA320-1 Wheel Loaders. These diesel-powered machines are engineered for demanding operational environments, offering robust performance and reliability. Their design prioritizes efficiency and durability, making them suitable for a wide range of construction and material handling applications. This manual is an essential resource for understanding and maintaining these powerful pieces of equipment. This comprehensive 841-page English language manual provides detailed information on maintenance, assembly, disassembly, servicing, repair, and troubleshooting. It includes complete step-by-step operations and actual real photo illustrations, diagrams, and schemes to facilitate understanding. The manual is designed to enable users to identify and resolve issues without requiring external service, covering key systems such as the engine, power train, steering, brakes, work equipment, and electrical systems.