When high operating pressures are required, piston pumps are often used. Piston pumps will traditionally endure higher pressures than gear pumps with comparable displacements; however, there exists a higher initial cost connected with piston pumps in addition to a lower level of resistance to contamination and improved complexity. This complexity falls to the equipment designer and service technician to understand in order to ensure the piston pump is usually working correctly with its extra shifting parts, stricter filtration requirements and closer tolerances. Piston pumps tend to be used in combination with truck-mounted cranes, but are also found within other applications such as snow and ice control where it could be desirable to alter system movement without varying engine quickness.

A cylinder prevent containing pistons that move around in and out is housed within a piston pump. It’s the motion of these pistons that draw oil from the supply interface and then push it through the outlet. The position of the swash plate, which the slipper end of the piston rides against, determines the length of the piston’s stroke. As the swash plate remains stationary, the cylinder prevent, encompassing the pistons, rotates with the pump’s input shaft. The pump displacement is definitely then dependant on the total volume of the pump’s cylinders. Fixed and variable displacement styles are both available.