This operating manual covers the Hyundai HL780-3A wheel loader, a robust piece of heavy equipment engineered for demanding tasks such as material handling, loading, and excavation. Its design prioritizes reliability and efficiency, ensuring optimal performance in various work environments. The manual provides comprehensive details on the machine's major components, working range, lifting capacities, and an essential bucket selection guide, all contributing to its versatility and operational excellence. The purpose of this manual is to serve as a definitive resource for the operation, maintenance, and troubleshooting of the Hyundai HL780-3A. It details all aspects of the machine, from cab controls and instrument cluster information to engine start-up and efficient working methods. Furthermore, it includes vital maintenance procedures, recommended oils, tightening torque specifications, and a complete troubleshooting guide for the engine and electrical systems, empowering owners and technicians to keep the equipment in peak condition.