This Workshop Service Repair Manual in English covers the Komatsu SK815-5N and SK815-5NA Skid Steer Loaders, applicable to serial numbers A30001 and up for the SK815-5N, and A10001 and up for the SK815-5NA. These machines are engineered for demanding tasks, offering robust performance and reliability in various operational environments. This manual is designed to provide comprehensive support for maintaining and repairing these essential pieces of equipment. The purpose of this manual is to serve as a definitive guide for all aspects of servicing and repair. It includes detailed sections on general information, structure and function, maintenance standards, standard value tables, testing and adjusting procedures, disassembly and assembly instructions, and diagrams and schematics. Owners, mechanics, and technicians will find the precise information needed to ensure the optimal performance and longevity of their Komatsu skid steer loaders.