This operating manual pertains to the Hyundai HL780-3A Wheel Loader. Engineered for demanding operational environments, this machine is designed for efficient material handling, driving, and general construction tasks. Its robust construction and advanced systems ensure reliability and performance, making it a valuable asset for any project requiring powerful and dependable wheel loader capabilities. The manual covers all aspects of its operation and maintenance to maximize its service life and operational efficiency. This comprehensive manual provides essential information for the safe and effective operation, maintenance, and inspection of the Hyundai HL780-3A Wheel Loader. It details procedures for driving, handling, lubrication, and routine maintenance, alongside critical safety guidelines for operation and parking. Furthermore, it includes troubleshooting guidance for key systems such as the engine, electrical, power train, and hydraulic systems, as well as specifications for major components. This resource is intended to assist owners, operators, and technicians in maintaining peak performance and ensuring the longevity of the equipment.