This manual pertains to the Hyundai HL770-9 Wheel Loader, a robust piece of equipment designed for demanding operational environments. Engineered for reliability and performance, the 9 Series models represent a significant advancement in wheel loader technology, built to assist in a wide range of construction and material handling tasks. Its construction emphasizes durability and efficiency, ensuring consistent output across various applications. The purpose of this Service Repair Manual is to provide comprehensive guidance for the maintenance, assembly, disassembly, servicing, diagnosing, and troubleshooting of the Hyundai HL770-9 Wheel Loader. It covers essential systems including the engine, powertrain, brake system, steering system, and work equipment, detailing their structure, function, and repair procedures. With detailed technical specifications, troubleshooting charts, and clear photo illustrations, this manual serves as an indispensable resource for owners, mechanics, and technicians to ensure optimal performance and longevity of the equipment.