This workshop service repair manual covers the Hyundai HL780-3A Wheel Loader. Engineered for demanding operational environments, this machine represents a commitment to robust performance and reliability in heavy-duty applications. Its design prioritizes efficiency and durability, making it a trusted choice for a wide range of construction and material handling tasks. This manual is specifically intended for service and repair operations, ensuring that the integrity and functionality of the HL780-3A are maintained throughout its service life. The purpose of this comprehensive English-language manual is to provide detailed guidance for the maintenance, troubleshooting, and repair of the Hyundai HL780-3A Wheel Loader. It includes essential information on safety, general specifications, engine details including QSM11 fault codes, and in-depth procedures for the power train, brake, steering, work equipment, and electrical systems. With step-by-step instructions, detailed illustrations, exploded diagrams, and drawings, this manual is an indispensable resource for owners, mechanics, and technicians seeking to ensure optimal performance and longevity of their equipment.