Intructions on how to replace a gearbox on a 1987 GMC suburban
set the front wheels in straight ahead position by driving vechicle a short distance on a flat surface. raise and support the vechicle safely on jack stands.place a drain pan below the steering gear. disconnect negative battery cable.disconnect fluid lines.cap the openings.mark the relationship of the pitman arm to the pitman shaft.remove pitman shaft nut and then remove the pitman arm from the pitman shaft using puller J - 6632. remove the steering gear to frame bolts and remove the gear assembly. TO INSTALL align the flat of the flexible coupling with the flat on the shaft push the coupling onto the shaft until the wormshaft bottoms against the end of the shaft.install the pinch bolt. make sure the bolt passes through the shaft undercut. tighten the pinch bolt to 75 ft lbs. place the steering gear into position guiding the coupling bolts into the proper holes in the shaft flange. install the steering gear to frame bolts and torque to 66 ft lbs.install the coupling flange nuts and washers. make sure the coupling alignment pins are centered in the flange slots. tighten the nuts to 20 ft lbs. maintain a coupling to flang dimension of 0.250 - 0.375 inches. install the pitman arm.install the hoses. you are done except bleeding power steering system. BLEEDING POWER STEERING. fill the the power steering pump reservoir to the proper level and let the fluid remain undisturbed for at least 2 minutes. start the engine and run it for only about 2 seconds.add fluid as necessary. keep doing this procedure until fluid level stop dropping. then raise the front of vechicle so the front wheels are off the ground.set the parking brake and block both rear wheels front and rear. manual transmission should be in neutral. automatic transmission should be in park. start the engine and run it at approximately 1500 rpm. turn the wheels off the ground to the right and left lightly, contacting the stops.add fluid as necessary. lower the vechicle and turn the wheels right and left on the ground.check the level and refill as necessary. if the fluid is extremely foamy, let the vechicle stand for a few minutes.with the engine off and repeat the procedure. if fluid looks foamy. once all done.dont drive vechicle on highway until normal steering is obtain.
Apr 13, 2011 |
1987 GMC Suburban