Steering System - Integral Power: Description
Integral power steering unit consists of a rotary hydraulic control valve housing, input shaft/worm gear/valve sleeve assembly, sector shaft, and 1-piece piston containing 27-29 recirculating balls. The 1-piece piston's teeth are meshed to sector shaft teeth. Sector shaft is connected to Pitman arm. Rotary hydraulic control valve assembly contains upper input shaft/valve sleeve, sleeve Teflon seals, and internal torsion bar. The input shaft/control valve sleeve is retained inside control valve housing by bearing and lock nut. Hydraulic action is generated by relative rotary motion between input shaft/control valve sleeve and worm/piston assembly. See Fig 1 and Figure .
The C-II power steering pump is used on all models except Van. The C-II pump is a belt-driven, slipper-type integral pump with a fiberglass/nylon reservoir. Reservoir is attached to rear of pump housing plate. See Fig 2 .
The C-II pump high-pressure hose is attached to pump using a swivel type fitting with "O" ring seal. This type fitting allows for hose movement without stressing line or fitting. Pump low pressure hose is slip-on design with hose clamp. Pump's high pressure hose fitting and low pressure hose pipe are located below filler neck at outboard side of reservoir. A pump identification tag with basic model number is attached to reservoir. See Fig 2 .
The Saginaw power steering pump is used on Van. Pump is a constant displacement vane-type pump. The reservoir is "O" ring sealed onto the pump housing. All integral pump moving parts are submerged in fluid. The fluid filler opening is on top of reservoir, unless engine type requires alternate remote reservoir. Pump reservoir cap is sealed when using remote reservoir.
Rectangular pump vanes are mounted into rotor and cam, and are driven by main pump shaft. Vanes move fluid from reservoir into cam ring. Fluid is pressurized by vanes in cam ring, then forced into cavities of thrust plate and through flow control valve. The flow control valve, regulates pressurized fluid to the steering gear unit. See Figure .