There are typically three types of hydraulic pump constructions within mobile hydraulic applications. These include equipment, piston and vane; nevertheless, there are also clutch pumps, dump pumps and pumps for refuse automobiles such as dry valve pumps
The hydraulic pump is the component of the hydraulic system that takes mechanical Hydraulic Pump china 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 push) such 
as the power take-off or straight from the truck engine.
With each hydraulic pump, the pump will be of either a uni-rotational or bi-rotational design. As its name implies, a uni-rotational pump is made to operate in one direction of shaft rotation. However, a bi-rotational pump has the ability to operate in either direction.