The Allis Chalmers HD-12G is a crawler loader produced from 1967 to 1974. It features a turbocharged 6-cylinder diesel engine with 195 hp net power, a 2-speed full power shift transmission, and 18-inch tracks. The tractor has an open operator station and is equipped with a front-end loader attachment capable of a 31400 lbs breakout force. It has a fuel capacity of 94 gallons and hydraulic system capacity varying from 37 to 49.5 gallons depending on the model year. The HD-12G is the successor to the HD-11G model.