This Service Repair Manual provides comprehensive information for the Hyundai HL780-9S Wheel Loader. Engineered for demanding applications, this machine is built for reliability and performance in various operational environments. Its robust design and advanced systems ensure efficient material handling and productivity. This manual serves as an essential guide for maintaining and repairing the Hyundai HL780-9S. It covers detailed procedures for the engine, power train, brake, steering, and work equipment systems, along with in-depth electrical system diagnostics. Included are sections on structure and function, operational checks, troubleshooting, testing, adjustments, and disassembly/assembly, enabling owners and technicians to keep the equipment in optimal working condition.