GM Service Manual Online
For 1990-2009 cars only

The power steering pump is a vane-type pump which provides hydraulic pressure for the system. The power steering system consists of the following components:

    â€¢ The driveshaft
    â€¢ The pump housing
    â€¢ The pump ring
    â€¢ The pressure plate
    â€¢ The thrust plate
    â€¢ The flow control valve
    â€¢ The rotor
    â€¢ The vanes

The opening at the rear of the pump housing contains the following components:

    â€¢ The pump ring
    â€¢ The pressure plate
    â€¢ The thrust plate
    â€¢ The rotor
    â€¢ The vanes
    â€¢ The end plate

The small opening on the side of the housing contains the following components:

    â€¢ The pressure line fitting
    â€¢ The flow control valve
    â€¢ The spring

The flow control orifice is a component of the pressure line fitting. A pressure relief valve inside the flow control valve limits the pump pressure.