The hydraulic pump which is used to drive the fluid has many different forms. Gear pump is the simplest form of hydraulic pump. In gear pumps, a case acts as an enclosure for two meshed gears. Rotatory action of these gears pushes the oil from inlet to outlet. The rotatory vane pump is another type of hydraulic pump. In this form of hydraulic pump, the oil is pushed with the help of a rotating beam, which further passes through a screw pump.