This manual covers the Mitsubishi FG/FD 40/45/50K/KL Series Forklift Trucks, industrial vehicles renowned for their durability and reliable performance in demanding environments. These robust internal combustion engine forklifts are designed for heavy-duty material handling applications. The series includes models such as the FG40K/KL, FG45K, FG50K, FD40K/KL, FD45K, and FD50K, offering lift capacities ranging from approximately 4,000 to 5,000 kg. Powered by either the Mitsubishi S6S Diesel Engine or the Mitsubishi TB45 Gasoline Engine, these forklifts are engineered for productivity and longevity, reflecting Mitsubishi's heritage in industrial equipment manufacturing. This comprehensive workshop service repair manual provides in-depth technical information essential for the maintenance, repair, and overhaul of your Mitsubishi forklift. It covers a wide array of systems including the cooling, electrical, power train, clutches, manual and power shift transmissions, front and rear axles, brake system, steering system, and hydraulic system, as well as the mast and forks. Detailed instructions are provided for both the S6S Diesel and TB45 Gasoline engines, encompassing tune-up procedures, mechanical overhauls, and system diagnostics. This manual is an invaluable resource for industrial operations, material handling businesses, and maintenance technicians seeking to ensure optimal performance and extend the lifespan of their equipment.