![]() 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. 1 Engineering and technical descriptionĮngineering and technical description.Information is available at or by calling 41 or e-mailing. We seek to develop relationships in the equipment manufacturing industry, and we offer a college scholarship for engineering and construction management students. Individual memberships within the USA and Canada are $35 for one year, $65.95 for two years and $99.95 for three years, and $45.00 US elsewhere. Our 2017 show will be November 3-5 at the Ederville Train and Tractor Show, Carthage, North Carolina, USA. With approximately 4,000 members in 25 countries, our activities include publication of a quarterly educational magazine, Equipment Echoes operation of National Construction Equipment Museum and archives in Bowling Green, OH and hosting an annual working exhibition of restored construction equipment. The Historical Construction Equipment Association (HCEA) is a 501(c)3 non-profit organization dedicated to preserving the history of the construction, dredging and surface mining equipment industries. Named Double Dude, the massive machine has been retired for some years, and Russell & Sons has restored the blade as a unique billboard. The curvature and angle of the blade was designed to move the most material possible to the side with minimal resistance, and working in passes up to 70 feet long it moved 14,210 cu. long, variably curved angle dozer fabricated by Balderson. behind the left-hand machine, and equipped it with an enormous 48 ft. They modified one of their two SxS D9H sets so that the right-hand tractor was offset 11 ft. Russell & Sons Construction Company of Longview, TX, took the SxS idea to its ultimate form in 1976. Also, the D11N was a highly effective machine for ripping, a task unsuitable for the SxS D9s. That, combined with greatly improved engine control systems, gave the D11N a decided advantage in fuel consumption. Although the paired D9Gs had the same horsepower at 1,375 rpm that the D11N generated at 1,800 rpm, the D11N cranked it out of 8 cylinders versus 12 for the two D9s. When the D11N was introduced in 1986, it had a substantial competitive advantage over the SxS and Dual D9s. The SxS concept met with limited success 11 D9G sets and 13 D9H sets were built until discontinuance in 1977. The two D9Gs combined for 770 hp, and the SxS D9H, which replaced it in 1974, was rated at 820 hp. The two tractors could be separated for individual use as needed. The operator was stationed on the left-hand unit, as seen from the rear, and operated both machines through a joystick and air over hydraulic controls, with the control lines on the rear tie bar. The ball-and-socket joints provided optimum traction under load and on rough ground. The two tractors were physically connected with ball and socket joints at the rear and at the two inside crawlers, and they pushed a 24-ft. The concept was similar to the Dual D9G, but instead of end-to-end these worked side-by-side (SxS). ![]() introduced the Dual D9G for pushloading, it also introduced the SxS D9G. In 1969, the same year that Caterpillar Inc. And while modified dozer designs such as the concave U- and semi-U dozers gave a single tractor increased blade capacity, there was still room for improvement. The Euclid TC-12, for all its power, was still only a single-width dozer and lacked the higher dozer capacity of its experimental predecessors. Various experiments were attempted – and failed – in creating a more powerful, higher-capacity dozer by combining two large crawler tractors onto one undercarriage. As with other large-scale earthmoving operations, efficiency, cost reduction and other issues were best addressed by machines designed for the task.īuster Peterson combined two Cat D9Gs end-to-end to create a single pushloading tractor with twice the power, but for high-volume material handling with a crawler tractor, the issue wasn’t so much the horsepower as it was blade capacity. Not only must the mineral be uncovered, but the overburden must be replaced to reclaim the land. Strip mining, by its very nature, requires massive amounts of earthmoving.
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