Bulldozer, also called Dozer, powerful machine for pushing earth or rocks, used in road building, farming, construction, and wrecking; it consists of a heavy, broad steel blade or plate mounted on the front of a tractor. Sometimes it uses a four-wheel-drive tractor, but usually a track or crawler type, mounted on continuous metal treads, is employed. 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.
Bulldozers are used for shallow digging and ditching; short-range transportation of material; spreading soil dumped from trucks; rough grading; removing trees, stumps, and boulders; and cleaning and leveling around loading equipment. A bulldozer alone can do many types of excavation, and it is useful in combination with other machinery in most excavation work.
Most people don't realize this, but a bulldozer is actually classified first and foremost as a tractor! The difference between a dozer and a farm tractor comes from the metal plate (also called a blade) featured in the front of the bulldozer. Similar to a tractor, however, the bulldozer is used to push massive amounts of debris and raw material, including sand, rocks, dirt, and bricks.
Bulldozers work primarily thanks to the force exerted by their tracking system. The tracks that rotate around the bottom of the dozer, like a circulating belt, are responsible for its considerable resilience on tough terrain and its ability to transport and retain hefty loads.
Other significant parts of the bulldozer are the ripper and the blade. As mentioned, the blade is often used interchangeably with “plate” to refer to the large metal structure on the front of the dozer. This is the part responsible for doing the heavy pushing.
The ripper of the bulldozer is found on the opposite side from the blade, all the way in the back of the machine. As the name suggests, this device "rips" up the ground and material covered by the bulldozer. It is shaped like a claw to produce this powerful shearing effect. If the ground is tightly packed together or compacted, the ripper will render the soil into a softer, more workable state.
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