Power Steering Pump

The power steering pump is a vane-type pump. Pump components include an engine-driven eccentric rotor with vane plates, an eccentric cam ring, and a flow control valve to regulate amount of oil flow and maximum oil pressure.

Vane plates (fitted in slotted grooves) are pressed against the cam ring surface by pressure produced in adjoining slots. As the rotor turns, space between the rotor and the cam ring changes. This produces oil pressure.