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Description & Operation

Steering gear is a variable ratio, recirculating ball-type which acts as a rolling thread between worm shaft and rack piston. The worm shaft is supported at the lower end by a thrust bearing with 2 races. It is supported at the upper end by a bearing assembly in the adjuster plug. Control valves, located inside steering gear housing, direct power steering fluid to either side of rack piston. See Fig 1 .

Steering linkage connects steering gear to front wheels through pitman arm. Steering linkage consists of pitman arm, idler arm, relay rod and tie rods. See Fig 2 -Fig 12 . Tie rod ends connect to relay rod by ball studs. Adjuster tubes between inner and outer tie rod ends are used to adjust toe. Some models have a shock absorber attached to relay rod.

Two different types of vane-type power steering pumps are used. The Model P pump is mounted inside the reservoir. See Figure . The Model TC pump is mounted below the reservoir. See Figure . On both models, the vanes are driven by a rotor and move fluid from the intake to the pressure cavities of pump ring.

Fig 1: Exploded View Of Power Steering Gear
G92E21901Courtesy of GENERAL MOTORS CORP.
Fig 2: Exploded View Of Steering Linkage (Astro & Safari - 2WD)
G92F21902Courtesy of GENERAL MOTORS CORP.
Fig 3: Exploded View Of Steering Linkage (Astro & Safari - AWD)
G92G21903Courtesy of GENERAL MOTORS CORP.
Fig 4: Exploded View Of Steering Linkage (Commercial Van)
G30278Courtesy of GENERAL MOTORS CORP.
NOTE: All figures in this article are Courtesy of General Motors.
Fig 5: View Of Steering Linkage (Commercial Van - I-Beam Axle)
G30281
Fig 6: View Of Steering Linkage (Commercial Van - Motorhome Chassis)
G30282
Fig 7: Exploded View Of Steering Linkage (Van)
G92H21904Courtesy of GENERAL MOTORS CORP.
Fig 8: Exploded View Of Steering Linkage (Sierra 2WD, Suburban 2WD & "C" Series Blazer & Pickup)
G92I21905Courtesy of GENERAL MOTORS CORP.
Fig 9: Exploded View Of Steering Linkage (Sierra 4WD, Suburban 4WD, Yukon & "K" Series Blazer & Pickup)
G92J21906Courtesy of GENERAL MOTORS CORP.
Fig 10: Exploded View Of Steering Linkage ("C" Series Pickup - I-Beam Axle)
G92A21907Courtesy of GENERAL MOTORS CORP.
Fig 11: Exploded View Of Steering Linkage (Jimmy 2WD, Sonoma 2WD & "S" Series Blazer & Pickup)
G91J13531Courtesy of GENERAL MOTORS CORP.
Fig 12: Exploded View Of Steering Linkage (Bravada, Jimmy 4WD, Sonoma 4WD, Syclone, Typhoon & "T" Series Blazer & Pickup)
G91A13532Courtesy of GENERAL MOTORS CORP.
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