This manual covers the Komatsu WA450-3 and WA450-3MC wheel loaders, designed for demanding operational environments. These machines are engineered for robust performance and reliability, featuring a powerful Komatsu SA6D125E-2 engine that delivers up to 315 gross horsepower. With a substantial operating weight of 21,480 kg and a bucket capacity ranging from 3.1 to 4.0 cubic meters, these wheel loaders are well-suited for heavy-duty material handling tasks. The planetary-gear type, full-powershift transmission with four forward and four reverse gears ensures efficient power delivery and maneuverability across various job sites. The Operation & Maintenance Manual provides comprehensive guidance for the safe and effective operation, maintenance, and repair of your Komatsu wheel loader. It includes detailed information on component explanations, operating procedures, troubleshooting, and technical specifications. This manual is essential for ensuring the longevity and optimal performance of your equipment, covering everything from initial service schedules and lubrication guidelines to safety precautions and cold-weather operation. It also details optional features and attachments, offering a complete resource for owners, operators, and technicians.