Allis-Chalmers HD-6 crawler | Heritage Machines
The Allis-Chalmers HD-6 crawler brought big tractor design features to the 50 drawbar horsepower class. Although the Allis-Chalmers HD-6 crawler was the smallest in the range by drawbar performance and weight, it outsold its bigger brothers significantly. When production finally ceased in 1974, over 25,000 units had been produced.