Not sure. Gardner Denver used Cat engines but mostly diesel, they had some with Buda gas engines. I have a Joy with D315.
I recently found this Chicago Pneumatic Tool (CPT) air compressor with a D311 (1951). Some of the CPT literature indicates they also used D3400 engines in the earlier versions.
[attachment=53260]D311 CPT Air Compressor 1951.jpg[/attachment]
This sounds like a good question for Mr. Ag Mike. He is very knowledgeable about welders, compressors, and gen sets. Also a very nice guy from the little bit I have talked with him on here about these things.
I'm sure cat offered gas power units, but don't know if anyone bought 'em for their compressor product line.
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