The Hyundai Thomas HSL600T and HSL680T Skid Steer Loaders represent robust and reliable machinery designed for demanding operational environments. These diesel-powered units feature a hydrostatic drive system, offering efficient and variable power delivery for a wide range of tasks. Engineered for durability and performance, these skid steer loaders are built to tackle construction, landscaping, and material handling challenges with consistent capability. This Service Repair Manual provides comprehensive technical information for the Hyundai Thomas HSL600T and HSL680T Skid Steer Loaders. It covers essential maintenance procedures, detailed troubleshooting guides, and critical technical specifications, including hydraulic system components, final drive systems, and main frame structural repair. The manual also includes electrical wiring diagrams and is intended to assist owners, technicians, and mechanics in maintaining the optimal performance and longevity of their equipment.