This workshop manual provides comprehensive service and repair information for the Komatsu FD and FG Series of vehicles. Designed for reliability and efficient operation, these models are engineered to meet demanding industrial needs. This manual covers a wide range of specific models including FG10/15/18-20, FG15H/18H-20, FD10/15/18-20, FG20/25/30-16, FG20H/25H/-16, FG20N/25N/30N-16, FG35A-16, FD20/25/30-16, FD20H/25H/30H-16, FD20N/25N/30N-16, and FD35A-16. The engineering quality and robust design of the Komatsu FD and FG Series ensure dependable performance across various applications. The purpose of this English-language workshop manual is to guide mechanics, vehicle owners with basic mechanical skills, and independent auto service professionals through the maintenance, repair, and troubleshooting of the covered Komatsu models. It includes detailed step-by-step instructions, diagrams, illustrations, and wiring schematics for all major topics, from general specifications and inspection to disassembly and assembly. This manual facilitates accurate diagnostics, provides essential technical data on engine, transmission, and chassis systems, and offers criteria for periodical inspection, ensuring the longevity and optimal performance of your vehicle.