The Fahr D66 is a farm tractor produced by Fahr from 1956 to 1958 with a total of 518 units built. It is powered by a Guldner LX 0.6L 1-cylinder air-cooled diesel engine producing 11 hp (8.2 kW). The tractor features a ZF A4 6-speed gear transmission with 6 forward and 2 reverse gears. It has a wheelbase of 65 inches (165 cm), length of 99.8 inches (253 cm), width of 57.9 inches (147 cm), height of 58 inches (147 cm), and weighs 1750 lbs (793 kg). The D66 is a two-wheel drive tractor with manual steering and an open operator station.