#Weight of d7 dozer series
The machine’s incorporated several improvements that Caterpillar engineers had developed but were unable to introduce due to the necessity of maintaining production of the existing 7M for WWII requirements.Īs the urgent demand for tractors subsided these improvements made their way into series production. The D7 3T, D7 4T and D7 6T were introduced in mid-1944. Wartime D7’s acquitted themselves very well and were used on all fronts, earning a respected reputation for ruggedness and reliability. Some 8100 examples were manufactured before the model was supplanted in production by the improved D7 3T, D7 4T and D7 6T. This was the D7 7M series which was manufactured from 1940 through 1944.Īlso powered by the D8800 engine, this had been uprated to 93 flywheel horsepower and the machine was only available in 74” gauge, Caterpillar having dropped the 60” option due to very low sales demand. World War 2Īs America entered a war footing, a new version of the D7 was introduced, primarily intended for military service, but a great many were also sold into commercial use. Production ended in 1940 with more than 7000 machines manufactured. Very few RD-7 5E machines were built before Caterpillar came out with another version of the machine, the RD-7 9G series.Īlso powered by the D8800 engine, now rated at 80 flywheel horsepower, the RD-7 9G was available in narrow gauge (60”) or wide gauge (74”).Ĭaterpillar dropped the “RD” designation at machine number 9G6501 with the tractor now just becoming the D7. While only in production for two years, the design proved its viability and in 1935 an improved version with a new name was introduced, the RD-7 5E series, powered by a 76 horsepower Caterpillar D8800 four-cylinder diesel engine. The D7 owes its origins to the Caterpillar Diesel Fifty which was introduced in 1933.
It has fought in three major conflicts – WWII, Korea & Vietnam – and is strong testament to a product that really was “built for it” By RICHARD CAMPBELL The iconic Caterpillar D7 has been in continuous production in various versions since 1935.
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