The Komatsu SK1020-5N and SK1020-5NA series represent robust compact equipment designed for demanding operational environments. These models are powered by the Komatsu S4D98E-2 engine, delivering 65.1 HP (48.5 kW) at 2700 RPM from its 3.30 L displacement. Featuring a hydrostatic transmission and four-wheel drive, they offer a rated operating capacity of 907 kg (2000 lbs) and a tipping load of 1814 kg (4000 lbs). With an operating weight of approximately 3,100 kg (6,834 lbs) and a maximum travel speed of 12 km/h (7.5 mph), these machines are engineered for reliability and performance in various applications. This Service Repair Manual provides comprehensive guidance for the Komatsu SK1020-5N and SK1020-5NA, covering serial numbers SK1020-5N: A70001 and up, and SK1020-5NA: A60001 and up. It details essential maintenance procedures, troubleshooting steps, technical specifications, and safety guidelines. The manual includes information on structure and function, standard value tables, testing and adjusting, disassembly and assembly, as well as diagrams and schematics. Its purpose is to assist owners, mechanics, and technicians in effectively maintaining, repairing, and understanding the intricacies of these Komatsu machines.