Allis-Chalmers Crawlers: An Impressive Track Record

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

With a 3-cylinder version of the GM 2-cycle Series 71 diesel engine, the Allis-Chalmers HD-7 was the smallest pre-war A-C diesel crawler, and also the best selling. More than 18,000 were built, some 5,000 of which were employed by the military in World War II.
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