The Komatsu SK1020-5N and SK1020-5NA Skid Steer Loaders are robust machines designed for demanding operational environments. These loaders, built with Komatsu's commitment to engineering quality and reliability, are equipped with a powerful Kubota V2203-M-DI diesel engine, delivering a gross power of 54.3 hp and a net power of 50.7 hp. Their hydrostatic transmission and 4-wheel drive system provide efficient power and maneuverability, making them suitable for a wide range of construction, landscaping, and material handling tasks. With an operating weight of 5511 lbs and a rated operating capacity of 1750 lbs, these skid steer loaders are engineered for performance and durability. This Workshop Manual serves as a comprehensive guide to aid in improving the quality of repairs and maintenance for the Komatsu SK1020-5N and SK1020-5NA Skid Steer Loaders. It is meticulously organized into chapters, each focusing on a main group of components, and further divided into sections covering Structure and Function, Testing and Adjusting, Disassembly and Assembly, and Maintenance Standards. This manual is an essential resource for owners, mechanics, and technicians, providing the detailed information necessary to perform accurate diagnostics, routine maintenance, and complex repairs, thereby ensuring the continued optimal performance and longevity of the equipment.