Bulldozers are machines that are classified as crawlers, which means that they move using continuous tracks or rigid plates joined to each other set on a system of wheels. The purpose of continuous track movement is to distribute the weight of the machine over a larger surface than wheels are able to distribute. A bulldozer is equipped with a blade known as a "dozer blade." Although the term "bulldozer" is often used to describe many different kinds of machinery, its correct use describes only a tractor with a dozer blade. The blade is used to move sand, soil, or debris, particularly during construction work. In early bulldozers, the blade was controlled by a winch/brake system, but now they are fitted with hydraulic cylinders, which allow more precision in the blade's operation.
A backhoe is another piece of machinery that uses hydraulics in order to function. A backhoe is a type of excavating equipment often referred to as a "digger." Essentially it is a tractor fitted with a two-part articulated arm with a digging bucket on the end for excavation purposes. The arm nearest the vehicle is called a "boom" and the second part of the arm is called the "dipper." The arm and bucket are powered by advanced hydraulic systems that allow precision of movement.
Fork lifts are also powered by hydraulic systems. These machines are powered industrial trucks used in the lifting and transporting of materials, particularly lifting pallets in warehouses and distribution centers. The mast of a fork lift is what does the work of raising and lowering a load. The mast is usually operated by one or more hydraulic cylinders.