This manual covers the Hyundai HSL600T and HSL680T Skid Steer Loaders, robust diesel-powered machines designed for construction, material handling, and earthmoving applications. Engineered for reliability and performance in various outdoor terrain and operating conditions, these 4-wheel drive loaders offer a seating capacity for one operator and feature a diesel engine. Their substantial weight, approximately 2600-2800 kg for the HSL600T and 2800-3000 kg for the HSL680T, underscores their industrial-grade construction. This comprehensive Service Manual and Operating Manual, provided in English, is an essential resource for maintaining and operating your Hyundai Skid Steer Loader. It details critical maintenance procedures, including recommended oil types and capacities, troubleshooting guidance, and technical specifications for the hydraulic system and other components. By following the instructions and safety guidelines within this manual, owners, mechanics, and technicians can ensure the optimal performance, longevity, and safe operation of the HSL600T and HSL680T models.