There are typically three types of hydraulic pump constructions found in mobile hydraulic applications. Included in these are equipment, piston and vane; nevertheless, additionally, there are clutch pumps, dump pumps and pumps for Hydraulic Pump china 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 usually taken from what is called the prime mover (a turning push) such as the power take-off or straight from the pickup 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 made to operate in one path of shaft rotation. On the other hand, a bi-rotational pump has the ability to operate in either direction.