This manual covers the Komatsu WA450-3 and WA450-3LE Wheel Loader models, with serial numbers A30001 and up. These machines are engineered for demanding work environments, offering robust performance and reliability. Notable operational features include handling for the ECS suspension and auto-greasing system, along with options display handling, all designed to enhance efficiency and operator experience in various applications. This Operation & Maintenance Manual provides comprehensive guidance for owners and technicians. It details maintenance procedures, including a maintenance schedule, lubrication guidelines, and the periodic replacement of safety-critical parts. The manual also covers general safety precautions for operation and maintenance, as well as the placement of safety labels. With easy-to-follow, step-by-step instructions and numerous pictures and diagrams, this manual empowers users to perform their own repairs and maintain their equipment effectively, leading to cost savings and prolonged service life.