The Allis Chalmers HD16A is an agricultural crawler tractor produced from 1955 to 1970. It features a 6-cylinder, 13.8L diesel engine delivering 163 hp gross and 148 hp net power. The tractor has a 6-speed gear transmission with 6 forward and 3 reverse gears, hydraulic clutch steering, and contracting band brakes. It rides on 20-inch wide tracks and weighs 31,500 lbs. The open operator station and crawler drive make it suitable for heavy-duty agricultural tasks. It was built in Springfield, Illinois, USA.