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Caterpillar Dozers |
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The Caterpillar D9 is a series of heavy tracked-type tractors, propelled by Caterpillar tracks and usually used as bulldozers. It came out as a protoype in 1954 as a D9X. Ten D9X prototype models were built in 1954. The D9 would become one of the worlds best dozers. The legendary 385 hp (287 kW) D9G would appear in 1961 and would be on the scene for the next 13 years. Over its 13-year life the D9G would be the main crawler on many job sites testifying to the dozers sturdiness and design.
In 1980, the 460 hp (340 kW) D9L was introduced. This dozer had the same elevated drive sprocket undercarraige that the larger D10 had. Between 1970-71 a Caterpillar D9G was built with an elevated drive sprocket undercarriage. A picture of one can be found on page 95 in a book called "Caterpillar Chronicle" by Eric Orlemann. The D9 has undergone several generations of engineering enhancements. Each new model is an even better dozer than the previous one. The D9L was the first variation of the D9 to employ elevated drive sprocket design in which the drive sprocket is elevated above the track, and not on the ground. The elevated drive sprocket gives the "belly pan" more ground clearance and makes the dozer more effective. The elevated drive sprocket undercarriage is a modular design. The 370 hp (280 kW) D9N replaced the D8L in 1987. They are still some of the best dozers in the world. Some historical information is paraphrased from Wikipedia. |
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