For the working of a hydraulic jack it depends on force which is generated by pressure. It depends on this basic kind of principle to lift heavy loads. They even use pump plungers to push oil through 2 cylinders. Firstly the plunger is drawn back; it then opens the suction valve ball inside and thus hauls oil in the pump chamber.
As the plunger is being pushed in a forward direction, oil moves past an external discharge valve into the chamber of cylinder. The suction valve shuts and this results in building of pressure inside the cylinder. If you are looking for the best hydraulic jack Singapore, get in touch with Springwell.