This Service Repair Manual covers the Komatsu WA300-1 and WA320-1 Wheel Loaders, with serial numbers starting from 10001. These machines are engineered for demanding tasks, offering robust performance and reliability in various operational environments. Their design prioritizes efficiency and durability, making them suitable for applications requiring consistent power and precise control. This comprehensive manual provides detailed instructions for maintenance, assembly, disassembly, servicing, repair, and troubleshooting. It includes information on the engine, power train, steering system, brake system, work equipment system, and electric and electronic systems. With numerous diagrams, real photo illustrations, schemes, and exploded diagrams, this manual is an essential resource for owners, mechanics, and technicians to ensure the optimal performance and longevity of their Komatsu wheel loaders.