Up until about 1960 ALL CRAWLER TRACTORS where crawler tractors. The dealer would add a blade, bucket, crane, or side boom used on pipe lines. Partly for working sidehills and because you could get bigger horsepower the west was farmed with crawlers on almost all tillage. Only with the coming of Versatile, and Steiger did it really change. Cat built Special Application steel tracked machine even after they had gone to the high track sprocket with the D8 L SA tractors. Primarily used for deep ripping of irrigated ground and ground being prepped for tree and vine crops.
Allis Chalmers got in the crawler business buying the Monarch tractor company. At the time of the AC U they came the Model M,K, S, and L . As the casting of radiator is the same look as the wheel tractors. Just prier to WW2 they had made the decision to use the Detroit Diesel 2 stroke engine in the more or less same chassis as before. But changing model names to HD7,HD 10, and HD 14. I think the HD 5 and HD 19 had to wait until the war was over. None of these had blade or other attachment made by AC all supplied by outside vendors. In about 1950 AC changed numbers again to HD 5 , HD 9, HD 15, and HD 20. In the 56 to 58 years AC bought Buda engine company and changed again to HD 6, HD 11, HD 16 , and HD 21. Have gotten a deal with Garwood manufacturing about the same time as the Buda deal AC was providing blades designed by Garwood. And soon bought that part of Garwoods business.
For what ever reasons never many if any of the small AC crawlers here. So no time on the H 3 or HD 3 but I believe the same engines as the D wheel tractors. But no dedicated dozers until the late 50's early 60's. Just a steel tracked tractor somebody added a dozer blade to.
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