This Service Shop Manual covers the Komatsu WA300-1 and WA320-1 Wheel Loaders, manufactured from serial number 10001 onwards. These robust machines are engineered for demanding operational environments, offering reliable performance and efficiency. Their design prioritizes durability and ease of operation, making them a valuable asset for various industrial and construction applications. This manual is dedicated to ensuring these wheel loaders operate at their peak performance throughout their service life. The purpose of this comprehensive manual is to provide essential guidance for the repair, servicing, and preventative maintenance of the Komatsu WA300-1 and WA320-1 Wheel Loaders. It includes highly detailed, step-by-step repair information, servicing procedures, and troubleshooting methods for common issues, all supported by photos and illustrations. By utilizing the information contained within, owners and technicians can effectively maintain the equipment, understand its operation, and reduce overall repair and maintenance costs, ensuring optimal functionality and longevity.