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Dozers are powerful machines for pushing earth or rocks used in road building, farming, construction, and wrecking. Some dozers have a four-wheel-drive tractor, but usually have a track or crawler type, mounted on continuous metal treads. The blade may be lifted and forced down by hydraulic rams. For digging, the blade is held below surface level; for transporting, it is held at the surface level; and for spreading, it is held above the surface level, as the tractor moves forward.