The Hyundai Heavy Industry HL770A A Series wheel loader is engineered for demanding operational environments. Powered by a Cummins QSB6.7 diesel engine producing 209 HP, this machine offers robust performance with a 6.7-liter displacement. Its ZF 4WG210 Powershift transmission, featuring 4 forward and 4 reverse gears, ensures efficient power delivery. With an operating weight of 23,300 kg and a bucket capacity of 3.5 m³, the HL770A is designed for heavy-duty material handling tasks. Notable features include multiple wet disc brakes for reliable stopping power and a 40-degree articulation angle for superior maneuverability. This Service and Repair Manual provides comprehensive guidance for the Hyundai Heavy Industry HL770A A Series. It covers essential maintenance schedules, including engine oil changes every 250 hours and hydraulic filter replacements every 1000 hours, alongside detailed information on fluid capacities for the engine, hydraulic system, and fuel tank. Technical specifications for the powertrain, hydraulics, and dimensions are included, along with troubleshooting procedures and safety guidelines. This manual is an indispensable resource for owners, mechanics, and technicians seeking to maintain the optimal performance and longevity of their HL770A wheel loader.