This manual covers the Hyundai HL780-3A Wheel Loader, a robust machine designed for heavy equipment operation and material handling. Engineered for reliability and performance, this wheel loader represents a significant advancement in its class, offering efficient operation and durability for demanding work environments. Its construction and operational capabilities are optimized to meet the rigorous requirements of various industrial and construction applications. This Service Repair Workshop Manual provides comprehensive guidance for the maintenance and repair of the Hyundai HL780-3A Wheel Loader. It details engine structure and function, powertrain, steering system, and work equipment disassembly and assembly procedures. The manual also includes electrical system information, component specifications, troubleshooting guides for key systems such as the engine, powertrain, brake, steering, work equipment, and electrical systems, as well as general safety hints and operational checkout records. This resource is essential for owners, mechanics, and technicians to ensure the optimal performance and longevity of the equipment.