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Home >> Chevrolet >> 1999 >> Forward Control P12 >> Repair and Diagnosis >> Steering >> Power Steering >> Power Recirculating Ball Steering >> Description & Operation

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 lower end by a thrust bearing with 2 races. It is supported at 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 reservoir. See Figure . The Model "CB" pump is mounted below reservoir. See Figure . On both models, vanes are driven by a rotor and move fluid from intake to pressure cavities of pump ring.

Fig 1: Exploded View Of Power Steering Gear
G93E76525Courtesy 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)
G95J27838Courtesy of GENERAL MOTORS CORP.
Fig 5: Exploded View Of Steering Linkage (Commercial Van - "I" Beam Axle)
G95A27839Courtesy of GENERAL MOTORS CORP.
Fig 6: Exploded View Of Steering Linkage (Commercial Van - Motorhome)
G95D27840Courtesy of GENERAL MOTORS CORP.
Fig 7: Exploded View Of Steering Linkage (Express, G-Van & Savana)
G92H21904Courtesy of GENERAL MOTORS CORP.
Fig 8: Exploded View Of Steering Linkage (2WD Escalade, Sierra, Suburban, Tahoe, Yukon & "C" Series Pickup)
G92I21905Courtesy of GENERAL MOTORS CORP.
Fig 9: Exploded View Of Steering Linkage (4WD Escalade, Sierra, Suburban, Tahoe, Yukon & "K" Series 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 (2WD Blazer, Jimmy, Sonoma & "S" Series Pickup)
G91J13531Courtesy of GENERAL MOTORS CORP.
Fig 12: Exploded View Of Steering Linkage (4WD Blazer, Jimmy, Sonoma & "T" Series Pickup)
G91A13532Courtesy of GENERAL MOTORS CORP.
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