This factory service repair manual covers the Fiat 55-90 tractor, a robust machine known for its reliability and engineering quality, part of Fiat's respected '90' series. Designed for agricultural applications, this tractor likely features a naturally aspirated diesel engine and a manual transmission, embodying the practical functionality expected from Fiat Tractors. The manual provides detailed information to assist owners and technicians in understanding and maintaining this agricultural workhorse. This comprehensive manual offers factory-trained technician-level information, covering routine maintenance, advanced troubleshooting, and step-by-step repair procedures for all major systems, including the engine, lubrication, cooling, fuel, clutch, transmission, drive chain, axles, brakes, steering, hydraulics, and electrical systems. With hundreds of pages of detailed content, including illustrations, diagrams, and photos, this English-language manual is designed for easy use and navigation, enabling efficient diagnostics and repairs. It serves as an essential resource for ensuring the longevity and optimal performance of your Fiat 55-90 tractor.