This workshop manual covers Fiat tractors from the 66 Series, including models 466, 566, 666, 766, 45-66, 55-66, 60-66, 65-66, 70-66, 80-66, and their respective DT (4WD) variants. These utility and general-purpose tractors, produced primarily in the 1980s and early 1990s, are known for their reliability and robust engineering. Designed for a wide range of agricultural applications, they feature naturally aspirated diesel engines and dependable mechanical transmissions, representing a significant contribution to Fiat's strong reputation in the agricultural machinery sector.

This comprehensive manual provides detailed guidance for maintenance, troubleshooting, and repair across all major technical systems. It covers the engine, transmission, hydraulics, electrical system, fuel system, cooling system, braking system, steering system, driveline, PTO, chassis, and operator station. With step-by-step instructions, diagnostic flowcharts, and essential technical specifications such as torque values and fluid requirements, this resource is invaluable for farmers, agricultural contractors, mechanics, and technicians seeking to maintain and repair these Fiat tractors efficiently and accurately.