This workshop service repair manual covers Fiat Trattori 480, 480DT, 500, 500DT, 540, 540DT, 640, 640DT, and Special Tractor models. These agricultural tractors, produced by the Italian manufacturer Fiat Trattori, are known for their reliability and versatility in demanding work environments. Likely manufactured from the late 1970s into the 1980s, these machines represent a significant development in agricultural machinery, offering robust performance and essential functionality for farming operations. The models feature diesel engines, with variants likely including 3-cylinder and 4-cylinder configurations, providing an estimated horsepower range of 45-70 HP, suitable for a wide array of tasks. This comprehensive manual provides in-depth technical information for owners, mechanics, and agricultural repair businesses. It details engine overhaul procedures, including all internal components, lubrication, and cooling systems. The powertrain, including transmission, differential, and axles, is thoroughly explained. Coverage extends to hydraulic systems, PTO and belt drive, fuel system, brakes, and the electrical system. With step-by-step instructions, exploded diagrams, and troubleshooting guidance, this manual serves as an essential resource for maintaining these tractors in optimal condition, ensuring longevity and minimizing repair costs.