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The Aultman-Taylor 30-60 was introduced in late 1910 or early 1911 and weighed almost 25,000 lbs. C.L. Best Gas Traction Co. came out with their Model 75 in 1913, it weighed 28,000 lbs. In 1918 Holt introduced their 70-120 Caterpillar. It weighed 24,800 lbs. During the 1913-1920 period Minneapolis Steel & Machinery Co. built their 60-90 tractor. Weight was 28,000 lbs. It's huge 6-cylinder engine had a 7.25x9 inch bore and stroke. IHC began producing their TD-24 in 1947. Weighing over 20 tons, it was powered by an IH 6-cylinder diesel engine with a 5.75x7 inch bore and stroke. The TD-24 boasted 148 drawbar horsepower. Caterpillar probably had the biggest, in terms of weight and horsepower. The "70", first build in 1932 weighed an impressive 30,000 lbs. The "70" diesel, build only in 1932 and 1933, weighed 31,000 lbs. Then there was the "75" diesel, it weighed over 16 tons and could pull nearly 9.5 tons on the drawbar, equivalent to about 80hp. Cat began making the RD-8 in 1935, it had a 6-cylinder engine with a 5.75x8 inch bore and stroke. This gave it the capability of over 103 belt horsepower. Weight was over 33,000 lbs. If you consider the D-9 an antique, it is larger, by far, than any of the previous tractors. Introduced in 1954 it weighed over 33 tons. With a 6-cylinder turborcharged engine having a 6.25x8 inch bore and stroke, it showed its power by pulling a load of nearly 57,000 lbs.
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