The Allis Chalmers HD-11E is an industrial crawler tractor produced from 1960 to 1974. It features a turbocharged 6-cylinder liquid-cooled diesel engine with 150 hp power output. The tractor was available in three variants with different transmission types: gear drive, power shift, and torque converter. It has a crawler drive with 16-inch tracks and an open operator station. The HD-11E is known for its robust construction and versatility in industrial applications.