The Hyundai HL770-9 Series is a robust wheel loader designed for demanding operational environments. Featuring a powerful Cummins QSB6.7 engine delivering 158 kW (212 HP) and a ZF 4WG210 Powershift transmission with electronic control, this machine is engineered for efficiency and reliability. Its substantial operating weight of 22,440 kg, coupled with a 3.5 m³ bucket capacity and a rated load of 10,000 kg, makes it suitable for heavy-duty material handling tasks. The articulated steering with load sensing and wet multi-disc service brakes ensure precise control and safety during operation. This Service Repair Manual provides comprehensive guidance for the maintenance and repair of the Hyundai HL770-9 Series wheel loader. It covers essential areas including detailed engine specifications, transmission operation, hydraulic system diagnostics, lubrication requirements, and recommended service schedules. With information on technical specifications, troubleshooting procedures, and safety guidelines, this manual is an indispensable resource for owners, mechanics, and technicians seeking to ensure the optimal performance and longevity of their equipment.