The Fahr D400B is a farm tractor produced by Fahr from 1955 to 1961 with a total of 4002 units built. It is powered by a Deutz F3L514 4.0L 3-cylinder air-cooled diesel engine producing 45 hp (33.6 kW). The tractor features a ZF A23 7-speed gear transmission with 7 forward and 2 reverse gears. It has a wheelbase of 91.3 inches (231 cm), length of 143.7 inches (364 cm), width of 87.8 inches (223 cm), and height of 92.9 inches (235 cm). The D400B is a two-wheel drive tractor with manual steering and an open operator station.