This manual covers the Hyundai HL780-7A Wheel Loader, a robust piece of heavy construction equipment engineered for demanding tasks. Designed for material handling, loading, excavation, and transport, this machine is ideal for construction and mining environments. It features a powerful Cummins QSM11-C300 engine, delivering 221 kW (296 HP) from its 10.8 L displacement, coupled with a 4WD automatic transmission for optimal performance and control. Its substantial operating weight of 27400 kg and dimensions, including a length of 8580 mm and width of 2990 mm, underscore its capability in large-scale operations. This Service and Operating Manual in English provides comprehensive guidance for the maintenance and operation of your Hyundai HL780-7A. It details essential procedures, technical specifications, and safety guidelines necessary for optimal performance and longevity. You will find information on fluid capacities, including 30 L for engine oil and 230 L for hydraulic oil, as well as general recommendations for diesel fuel and oil types. This manual is an indispensable resource for owners, mechanics, and technicians seeking to ensure the reliable and efficient functioning of this heavy construction equipment.