The Hyundai HL770-9 Wheel Loader is a robust piece of equipment engineered for demanding operational environments. Featuring a powerful Cummins QSB6.7 4-stroke, turbocharged, direct injection diesel engine, it delivers a gross power of 155 kW (208 hp) and a net power of 147 kW (197 hp) at 2000 rpm, with an engine displacement of 6.7 L. This wheel loader is designed for efficiency and reliability, incorporating a ZF Powershift transmission with 4 forward and 4 reverse gears, and boasts an operating weight of 22,500 kg. Its substantial dimensions, including a length with bucket of 7,430 mm and a width over tires of 2,500 mm, along with a bucket capacity of 3.5 m³, make it suitable for a wide range of material handling tasks. This comprehensive manual provides essential information for the operation and maintenance of the Hyundai HL770-9 Wheel Loader. It covers critical areas such as detailed service procedures, troubleshooting guides, and technical specifications, including fluid capacities for engine oil, hydraulic oil, transmission oil, and coolant, as well as service intervals for engine oil changes and air filter replacement. The manual is intended to assist owners, operators, and technicians in ensuring the optimal performance, longevity, and safety of the equipment. All information is presented in English to facilitate understanding and application across diverse user bases.