Internationally, Caterpillar is the world's largest construction machinery manufacturing company. Its crawler-type crawler bulldozers have 9 series D3-D11, large, medium and small, the largest D11 RCD, and the diesel engine flywheel power reaches 634kw; Japan's Komatsu Company ranks second. It only began to introduce and produce D50 crawler bulldozers in 1947. There are 13 series of crawler bulldozers, from D21-D575, the smallest is D21, and the diesel flywheel power is 29.5kw, the largest The D575A-3SD diesel engine has a flywheel power of 858kw. It is also the largest crawler bulldozer in the world.
Another unique manufacturer of crawler bulldozers is the German Liebheer Group (Liebheer). Its crawler bulldozers are all driven by hydrostatic pressure. After more than ten years of research and development, the technology has launched a prototype in 1972 and started mass production in 1974. Production of PR721-PR731 and PR741 hydrostatically driven crawler crawler bulldozers. Due to the limitation of hydraulic components, the current maximum power is only 295Kw, and the model is PR751 for mining.
