Growl Noise in Steering Pump for Chevrolet Chevy P42 Commercial Chassis 1998

Excessive back pressure in the hoses or the steering gear caused by a restriction (noticeable with vehicle moving)

Locate and repair the restriction.

Scoring on the pressure plates, thrust plates, or rotor (noticeable with vehicle at a standstill)

Replace the components and flush the system.

An excessively worn cam ring (noticeable with vehicle at a standstill)

Replace the components.