
The Allis-Chalmers HD-20 tractor
Allis-Chalmers manufactured approximately 3000 HD-20s before the type was discontinued in late 1954 to be replaced by the all-new HD-21, a tractor that was to have a long and very successful career. The HD-20 described. As mentioned earlier, power for the HD-20 came from a General Motors model 6-110 diesel. A naturally aspirated, Rootes blown ...