The D9L is also the heaviest D9 in history at 130,000 lbs. The D9L is the most powerful D9 in history, with a flywheel power of 460 hp. The main difference between the D9T and the D9R is the installment of the new Cat C18 ACERT engine. The D9L was replaced by the 520 hp (390 kW) D10N in 1987. The L, N, R and T models of the D9 are visually very similar, differing primarily in the design of their internal systems. ![]() The current model is the D9T however, older models such as the D9R, D9N, and D9L are still commonly used. The D9T has a low-emissions ACERT diesel engine. In 1988, Caterpillar produced their 25,000th elevated-drive-sprocket track-type tractor, a D9N. As a result, one can pull the powershift transmission out the rear. To repair the machines one breaks down the tracks and pulls the drive sprockets out. The elevated-drive-sprocket undercarriage is a modular design. The new undercarriage design reduced strain and shock loads on the final drives and gave the "belly pan" more ground clearance. The unit featured the same new type of elevated-sprocket undercarriage as was used in the larger D10. The DD9H and the SxsD9H would soon follow. The D9H is still the most powerful conventional track-type tractor in company history. In 1974, the improved 410 hp (310 kW) D9H was introduced to replace the D9G. In 1969, Caterpillar introduced this new SxS D9G. Peterson also built the first SxS D9G which has two D9Gs side-by-side, pushing a 24-foot (7.3 m) wide bulldozer blade. In 1986 Caterpillar bought the rights to this concept and thus the 770 hp (570 kW) DD9G was created (D stands for Dual D9G). In 1965, West Coast businessman Buster Peterson hooked up a pair of D9Gs to pushload the largest wheel tractor scrapers built. Over its 13-year life the D9G became the main crawler on many job sites, testifying to its sturdiness and design. Two years later, in 1961, the legendary 385 hp (287 kW) D9G was introduced, that remained in production for 13 years. The new 335 hp (250 kW) D9E replaced that model in 1959. In 1956 the D9 had its engine power raised to 320 hp (240 kW). The D9 came equipped with a 1,473 cid D353 which powered the D9 right up until the 1980 introduction of the D9L. ![]() ![]() ![]() In 1955, the 286 hp (213 kW) D9 was introduced to compete against the more powerful Euclid TC-12. Ten D9X prototype models were built in 1954. The series began in 1954 with a prototype tractor called the D9X. The D9 is a series of heavy tracked-type tractors, propelled by Caterpillar tracks and usually used as bulldozers. The D9, with 354 kW (474 hp) of gross power and an operating weight of 49 tons, is in the upper end of Caterpillar's track-type tractors, which range in size from the D3 57 kW (77 hp), 8 tons, to the D11 698 kW (935 hp), 104 tons. It is usually sold as a bulldozerequipped with a detachable large blade and a rear ripper attachment. The Caterpillar D9 is a large track-type tractor designed and manufactured by Caterpillar Inc.
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