Allis-Chalmers Crawlers: An Impressive Track Record

Tracing the history of the Allis-Chalmers crawler and its parent companies.

Basically the same as the HD-20, the Allis-Chalmers HD-21 used the Allis-Chalmers/Buda 6-cylinder, 4-cycle diesel engine with gear-driven supercharger, rather than the 2-cycle GM diesel of the HD-20.
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