There are usually three types of hydraulic applications. Included in these are equipment, piston and vane; however, there are also clutch pumps, dump pumps and pumps for refuse automobiles such as dry valve pumps
The hydraulic pump may be the component of the hydraulic system that takes mechanical energy and converts it into fluid energy in the type of oil flow. This mechanical energy is certainly taken from what is called the primary mover (a turning force) such as the power take-off or directly from the truck engine.
With each hydraulic pump, the pump will be of the uni-rotational or bi-rotational design. As its name implies, a uni-rotational pump is designed to operate in one direction of shaft rotation. However, a bi-rotational pump has the ability to operate in either path.