This Service Repair Manual covers the Komatsu WA300-1 and WA320-1 wheel loaders, representing the First Generation models. These machines are engineered for reliability and efficiency in various heavy-duty applications. With robust construction and dependable diesel engines, they are designed to provide consistent performance. The WA300-1 and WA320-1 models feature automatic power shift transmissions and offer substantial bucket capacities, making them versatile tools for construction, mining, and material handling operations. This manual provides comprehensive information to assist in the maintenance, repair, and troubleshooting of your Komatsu wheel loader. It includes detailed procedures for the powertrain, hydraulic systems, steering, braking, and electrical systems. With step-by-step instructions, high-quality diagrams, and clear explanations, this guide is an essential resource for owners, technicians, and mechanics. Following the guidance within this manual will help ensure the longevity and optimal performance of your equipment.