The Bush Hog D4-12 is a garden tractor produced from 1971 to 1972 by Bush Hog in Galesburg, Kansas, USA. It features a 12 hp Tecumseh HH120 453cc 1-cylinder air-cooled gasoline engine with electric start. The tractor has a shaft-driven 4-speed gear transmission with 4 forward and 2 reverse gears, two-wheel drive, manual steering, and an open operator station. It includes a mid PTO with an independent manual clutch. Electrical system is 12 volts with negative ground. Attachments include 32" and 42" mid-mount mower decks with manual lift and left discharge. The D4-12 is related to the D4-10 model.