Allis-Chalmers Crawlers: An Impressive Track Record

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

The Allis-Chalmers HD-15 diesel crawler was much the same as the HD-9 except for a 6-cylinder GM Series 71 engine in place of the 4-cylinder version. Also, hydraulic steering controls and self-energizing brakes made for better control. In Nebraska tests, the HD-15 could pull more than its own weight.
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