This manual covers the Fiat 55-66 F Tractor, a robust and reliable machine from the renowned Fiat Trattori heritage. As part of the successful '66 Series', this tractor was engineered for efficiency and durability, making it a staple in agricultural operations. Its design emphasizes practical functionality, with a focus on dependable performance in various farming tasks. The engineering quality inherent in Fiat's long history in agricultural machinery ensures that the 55-66 F Tractor is built to withstand demanding work environments, offering owners a cost-effective and enduring solution for their needs. This comprehensive service repair workshop manual provides in-depth information for owners, independent service professionals, and technicians. It details essential maintenance procedures, step-by-step repair instructions, and troubleshooting guidance for all major systems, including the engine, powertrain, hydraulics, electrical system, front axle, and rear wheels. With manufacturer-written content equivalent to dealer-level documentation, this manual equips users with the knowledge to perform routine maintenance, complex repairs, and diagnostics, ensuring the longevity and optimal performance of the Fiat 55-66 F Tractor.