This manual covers the Forklift Truck Type D003 series, specifically models H30H, H40H, H50H, and H60H. These industrial forklifts are engineered for reliability and efficiency in demanding work environments. The D003 series offers a range of capacities, designed to meet various material handling needs. Key features include robust construction, dependable engine options such as the Ford 4-172 and Perkins 4.203, and advanced transmission systems like the Powershift with Monotrol pedal or the Oil Clutch transmission. The forklifts are built with a focus on operator interface and durable components, ensuring consistent performance. This comprehensive workshop manual provides detailed information on the operation, maintenance, and repair of the Forklift Truck Type D003. It covers all major systems, including fuel, electrical, steering, hoist, brake, transmission, drive axles, engines, and frame components. The manual includes safe operation procedures, tune-up specifications, troubleshooting guidance, and detailed repair instructions for all covered systems. With high-quality images, circuit diagrams, and component diagrams, this 362-page English-language manual is an essential resource for owners, mechanics, and technicians seeking to maintain and repair these forklifts.