Crawler Bulldozer (track-type tractor, also called crawler dozer) by Benjamin Holt in 1904, successfully developed, which is installed in the track-type tractor in front of manpower to enhance the formation of the earth-moving equipment was the driving force is the steam engine, and later has successfully developed and powered by natural gas, gasoline engine-powered track-type tractors, bulldozers Blade also enhance the development of wire rope from a manpower increase. Benjamin Holt is also the U.S. Caterpillar Inc.’s Founder in 1925 5Holt manufacturing company and CL, Best Tractor Co. merge to form Caterpillar Tractor Co. to become the world’s first earth-moving equipment maker, and in 1931, under the success of line of the first with a diesel engine, 60 bulldozers.

As technology advances, the current momentum bulldozers have been used in all diesel engines, earth moving shovel knife and loosen the soil by a hydraulic cylinder to upgrade all devices. In addition to track-type tractor bulldozer, there are tire-type bulldozer, its appearance a decade later than the track-type tractor around. As the track-type tractor has good adhesion properties, can play an even greater traction, the variety and quantity of their products far exceeds the tire dozers. Internationally, Caterpillar is the world’s largest construction machinery manufacturing company, its production of track-type bulldozer large, medium and small total of nine series of D3-D11, the largest D11 RCD, diesel engine flywheel power to 634kw; Japan komatsu company out of second place in 1947 began to introduce production of D50 crawler dozers, crawler tractors now have 13 series, from the D21-D575, the smallest for the D21, diesel engine flywheel power 29.5kw, the largest for the D575A-3SD , diesel engine flywheel power up to 858kw, it is currently the world’s largest bulldozer; another a unique bulldozer manufacturers of Germany Liebheer, bulldozers used in all of its hydrostatic drive, the technology after 10 years of research and development, prototype in 1972, launched in 1974 began to mass production of PR721-PR731 and PR741 hydrostatic drive crawler tractors, hydraulic components, due to constraints, at present the maximum power is only 295Kw, model PR751 mining.