Plunger Hydraulic Jack

A hydraulic jack uses a liquid, which is incompressible, that is forced into a cylinder by a pump plunger. Oil is used since it is self lubricating and stable. When the plunger pulls back, it draws oil out of the reservoir through a suction check valve into the pump chamber.A hydraulic jack is a device that is used to lift heavy loads by applying a force via a hydraulic cylinder. Hydraulic jacks lift loads using the force created by the pressure in the cylinder chamber.