The Caterpillar D8 is an agricultural crawler tractor produced from 1937 to 1965 by Caterpillar in Peoria, Illinois, USA. It features a 20.4L 6-cylinder liquid-cooled diesel engine producing 115 hp, with a 6-speed gear transmission and crawler drive. The tractor has a weight of 36,520 lbs and 20-inch wide tracks, designed for agricultural use with an open operator station.