The Fiat 55-90 Series Tractor represents a robust and reliable line of agricultural machinery, produced by the esteemed Italian manufacturer Fiat Trattori from the late 1980s through the 1990s. These tractors are recognized for their durable construction and efficient performance across a variety of farming tasks. Built with a focus on functionality and cost-effectiveness, the 55-90 series embodies Fiat's long-standing heritage of innovation in agricultural equipment, offering a dependable solution for demanding operational needs. This comprehensive Workshop Service Manual, presented in English and spanning 377 pages, provides extensive technical information for the Fiat 55-90 Series Tractor. It covers all major systems, including detailed procedures for engine, transmission, hydraulics, electrical, braking, steering, power take-off, and axle components. The manual includes routine maintenance schedules, troubleshooting guides, step-by-step disassembly and assembly instructions, repair and rebuild procedures, and precise adjustment and calibration guidelines. With rich illustrations and factory specifications, this manual is an indispensable resource for mechanics and DIY individuals aiming to maintain and repair their tractor effectively.