The Caterpillar D6C is an industrial crawler tractor produced from 1963 to 1976. It features a Caterpillar diesel liquid-cooled engine delivering 120 hp (89.5 kW) net power. The tractor uses a direct drive and 3-speed power shift transmission with 3 forward and reverse gears. It is designed with a crawler drive and has a track gauge of 74 inches (187 cm).