Tracked bulldozers (Track-type tractor, also known as Crawler dozer) were developed by the American Benjamin Holt in 1904, which was formed when a human-powered bulldozing device was installed in front of the crawler tractor, which was driven by a steam engine, After the successful development of natural gas powered and gasoline engine-driven crawler-type bulldozers, bulldozing blade is also promoted by human development for wire rope promotion. Benjamin Holt is also a caterpillar in the United States (Caterpillar One of the founders of the company, the 1925 5Holt Manufacturing Company and the C.l,best Bulldozer Company, formed Caterpillar Bulldozer Company, became the world's first bulldozing equipment manufacturer, and successfully rolled out the first batch of 60 bulldozers with diesel engines in 1931. With the continuous progress of technology, bulldozer Power has been all adopted diesel engines, bulldozing blade and the Ripper are all raised by the hydraulic cylinder. Bulldozers in addition to crawler-type bulldozers, and tire-type bulldozers, it appears more than a crawler-type bulldozer about ten years later. Because the crawler bulldozer has better adhesion performance and can exert greater traction force, the variety and quantity of its products is far more than that of the tyre type bulldozer at home and abroad. At the international level, Caterpillar is the world's largest engineering machinery manufacturing company, its crawler-type bulldozers have large, medium and small total of 9 Series D3-d11, the largest D11 RCD, diesel engine flywheel power up to 634kw; Komatsu (Komatsu) Company of Japan, second place, 1947 The introduction of the production of D50 Crawler bulldozers, crawler-type bulldozers have 13 series, from d21-d575, the smallest for D21, The diesel engine flywheel power is 29.5kw, the biggest is D575A-3SD, the diesel engine flywheel power reaches 858kw, it is also the current world biggest bulldozer; another unique bulldozer manufacturer is the German Liebherr Group (Liebheer), whose bulldozers are powered by hydrostatic, a technology that has undergone more than 10 years of research and Development, 1972 launched prototype, 1974 began mass production of pr721-pr731 and PR741 static hydraulic drive crawler bulldozers, due to the limitations of hydraulic components, the current maximum power of 295Kw, the model for PR751 mine.
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