The car hydraulic steering pump is the ideal vehicle for engine, the use of the pump can greatly reduce the intensity of the work of the driver, thereby enhancing safety and comfort of driving vehicles. The pump itself with the flow of control and the over-current protection system applicable to rotational speed changes required to maintain constant flow pump, and motor drive back system with over-current protection , a good rotational speed, flow properties, is widely used in heavy medium trucks, buses, cars and construction vehicles to the system.