There is excessive back pressure in the hoses or the steering gear caused by restriction

Locate and repair the restriction.

The pressure hose is touching other parts of the vehicle.

Adjust the hose position. Do not bend the tubing by hand.

There is scoring on the pressure plates, thrust plates, or rotor

Replace the power steering pump. Refer to Power Steering Pump Replacement .

There is an excessively worn cam ring

Replace the power steering pump. Refer to Power Steering Pump Replacement .