Hydraulic cylinders are often the preferred product for linear movements due to their high power density, velocity, long service life and compact design. These elements together make it a durable product difficult to match by other types of drives. The hydraulic drive mainly exists of cylinders, a power unit and a piping system. The power unit is the heart of the machine. The cylinders are the muscles which are put into motion. And the pipes are the veins through which the oil flows. All components need the best care possible; one cannot function without the other.