The Shibaura SD4643 is a compact utility tractor produced from 1980 to 1985 as part of the SD 3 Series. It features a turbocharged 2.1L 4-cylinder liquid-cooled diesel engine delivering 46 hp (34.3 kW). The tractor offers a 12-speed gear transmission with an optional 24-speed creeper, four-wheel drive, and an open operator station. It was built in Matsumoto, Japan, and is equipped with standard agricultural tires sized 8-18 front and 12.4/11-28 rear. The SD4643 is a versatile and reliable tractor suitable for various compact utility tasks.