This Operation & Maintenance Manual provides comprehensive information for the Komatsu WA380-3 Wheel Loader, including the WA380-3MC variant, with serial numbers A51001 and up. Engineered for demanding applications, the WA380-3 is recognized for its robust construction and reliable performance. This manual details procedures for optimal operation, handling, lubrication, and maintenance, ensuring peak efficiency and safety throughout its service life. The purpose of this manual is to serve as an indispensable resource for owners, operators, and service technicians. It covers essential areas such as general operation, specialized procedures for transportation, cold weather, and long-term storage, as well as troubleshooting guidance. Detailed maintenance schedules, lubrication charts, standard torque values, and procedures for periodic replacement of safety-critical parts are included. Furthermore, this manual provides technical specifications, information on optional parts and attachments, and crucial safety precautions for both operation and maintenance.