There is excessive back pressure in the hoses.

1. Inspect the hoses for restrictions. Refer to Power Steering System Test .
2. Replace the hoses as needed. Refer to Power Steering Hoses Replacement or Power Steering Hoses Replacement .

There is excessive back pressure in the steering gear.

1. Inspect the steering gear for restrictions. Refer to Power Steering System Test .
2. Replace the steering gear if needed. Refer to Steering Gear Replacement .

The pressure plate is scored.

Replace the pressure plate. Refer to Power Steering Pump Replacement or Power Steering Pump Replacement .

The thrust plate is scored.

Replace the thrust plate. Refer to Power Steering Pump Replacement or Power Steering Pump Replacement .

The rotor is scored.

Replace the rotor. Refer to Power Steering Pump Replacement or Power Steering Pump Replacement .

The pump ring is worn.

Replace the pump ring. Refer to Power Steering Pump Replacement or Power Steering Pump Replacement .