The power steering pump is used to assist the driver to steer the vehicle at low speeds. The is powered by the fan belt, it has a similar design as an oil pump. It uses a rotor with vanes on it inside a cam ring to pump the power steering fluid to the steering rack. The pump has a high pressure hose that goes to the steering rack and a low pressure hose that returns the fluid from the steering rack. The pump has a pressure relief valve to let the fluid return to the reservoir when the car is traveling at high speeds.
The main problems that occur in steering pumps is that the fluid lines break or the seals wear out so the pump loses fluid. The bearings also wear out due to its age or the fan belt is over tightened. Most power steering pump pulleys are bolted on to the pump shaft although some are pressed on. To get a pulley off that has been pressed on the pulley needs to be heated up so that it expands and then pulled off with a puller.
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