This manual covers the Mitsubishi FD100, FD115, FD135, and FD150A forklift trucks, models known for their robust construction and reliable performance in demanding industrial environments. These forklifts are engineered with a focus on durability and operational efficiency, featuring powerful 6D16 Diesel Engines and advanced powershift transmissions. The FD series represents Mitsubishi's commitment to providing dependable material handling solutions, designed to meet the rigorous needs of warehousing, logistics, and manufacturing operations. Their construction emphasizes ease of maintenance and longevity, ensuring consistent productivity and operational uptime. This comprehensive service repair workshop manual provides essential factory-level information for technicians, mechanics, and owners. It details maintenance procedures, including scheduled servicing, fluid changes, and filter replacements, alongside in-depth troubleshooting guides for all major systems. Coverage extends to the electrical system, power train, 2-speed and 3-speed powershift transmissions, axles, brake system, steering system, and the hydraulic system, including mast and forks. With clear text, high-quality diagrams, and step-by-step instructions for assembly, disassembly, and repair, this manual is an indispensable resource for maintaining the optimal performance and extending the service life of your Mitsubishi forklift.