Chevrolet’s linkage-type power steering is available as an RPO (Regular Production Option) on all models except Forward Control Chassis. New ease and fingertip steering control are provided because up to 80 percent of the steering work is done by hydraulic power. Maneuvering a heavily loaded truck in a small space becomes much easier, and straightaway highway travel is less fatiguing. In addition, power steering effectively damps road shock and vibration at the steering wheel.
A hydraulic pump, driven by an extension of the generator shaft, provides hydraulic pressure of 750-900 pounds per square inch. (A 30-ampere or heavy-duty 40-ampere generator is included with the power steering option.) The control valve on the Pitman arm reacts to movement of the steering wheel and regulates the flow of fluid to the power cylinder.
This valve directs fluid under pressure to either the left or right side of the piston in the power cylinder, thus providing assistance for both left and right turns. Manual steering, in case the system is inoperative, is always available.