The first bulldozers were used for the
fields to snow clearance. In order to dig water chanals, to raise
sand barriers and to make other earthmove the tractors was equipped
with a large thick metal plate. This thick metal plate (later it
received its curved form) called " blade".
Over the years, the large genius when
necessary machinary performe with large scales of excavation work, of
the companies as Caterpillar tracks started to manufacture large
indicated follow-up-type of earthwork of Tractors. They large,
powerful and noisy for this purpose and were called "
bulldozer". With the passing of years, the bulldozers have
larger, more powerful and more sophistacted.
Important improvements includes understands best the tracks, raised cabin, hydrualic controls which allowed menuever the blade and l' improvement of engine. Most known of model is the bulldozer Caterpillar D9 which gained a great reputation like if, durable and reliable bulldozer. is mainly because of its military applications - by the FDI and the American army. Bulldozers were also necessary for the urban building work and of smaller versions were developed - mobilized by the wheels and modified the blade \ shovel. With the d' place; a blade almost flat, they are equipped with deeper like bucket-shovel. The shovel is joined with hydrualic weapons which allows l' operator of weak and to raise the shovel, which returns useful to dig, the wearing of loading and stuff (dirtiness on trucks) tasks. Consequently, they are called chargers. Large chargers are serveral made by companies such as Caterpillar and Volvo (for example, the G966 model). Bulldozer can be found on the building sites, the mines, at the edge of the roads, of military bases, l' heavy industry and of large factories of government projects.