The power steering fluid is low.

Add an adequate amount of power steering fluid. Refer to Refilling the Power Steering System .

The pump pressure is insufficient.

Refer to Power Steering System Test Procedure .

The gear pressure relief valve is faulty.

Replace the faulty gear pressure relief valve. Refer to Steering Gear Check Valve Replacement - Off Vehicle .

The steering linkage is binding.

1. Inspect the steering linkage for worn components.
2. Replace any worn components.