This Service Repair Workshop Manual provides comprehensive information for the Hyundai HL780-9S Wheel Loader, a robust machine designed for demanding operational environments. Engineered for reliability and performance, the 9S Series represents a significant advancement in heavy equipment technology, offering efficient power delivery and durable construction suitable for a wide range of construction and material handling tasks. Its design emphasizes operator comfort and productivity, making it a valuable asset for any project. This manual serves as an essential guide for maintaining and repairing the Hyundai HL780-9S Wheel Loader. It covers detailed procedures for the power train, brake, steering, and work equipment systems, along with in-depth electrical system diagnostics, component specifications, and troubleshooting guides. Additionally, the manual includes critical safety information, general specifications, and operational checks, empowering owners, technicians, and mechanics to ensure the longevity and optimal performance of their equipment.