Steering System - Power: Other Chevrolet Pickup C2500

HYDRAULIC SYSTEM BLEEDING

1. Fill reservoir to correct level. Allow fluid to settle for no less than 2 minutes. Start engine and run for 30-60 seconds, then turn off. Check fluid level and add fluid (as necessary). Repeat procedure until fluid level in reservoir remains constant.
2. Raise and support vehicle with both front wheels off ground. Start engine. Turn wheels right and left, lightly contacting stops. Check fluid level and add fluid (as necessary).
3. Lower vehicle. Turn wheels right and left, slowly from lock to lock. Turn off engine. Check fluid level and add fluid (as necessary). If fluid is foamy, allow vehicle to sit for a few minutes and repeat bleeding procedure.

POWER STEERING PUMP BELT

BELT TENSION (1)

WORM BEARING PRELOAD

1. Remove steering gear from vehicle and mount in vise before performing preload adjustments. See STEERING GEAR R & I. Remove worm bearing adjuster lock nut. see scheme 1 Using spanner wrench, turn adjuster plug clockwise until plug is seated in housing. Torque should be about 20 ft. lbs. (27 N.m).
2. Index mark housing even with one hole in adjuster plug. (Scheme 15) Measure back 1/2" counterclockwise from first index mark. Mark housing with second index mark. Rotate adjuster plug back counterclockwise until hole in adjuster plug aligns with second index mark on housing. Install and tighten adjuster plug lock nut. Ensure adjuster plug remains in position.

Scheme 15

OVER-CENTER PRELOAD

1. With worm bearing preload adjusted, rotate stub shaft slowly from stop to stop while counting total number of turns. With stub shaft positioned at either stop, rotate stub shaft back 2/3 total number of turns counted. Stub shaft should be back to exact center position. Flat on stub shaft should be facing upward and parallel to side cover and master spline on pitman shaft should be aligned with adjuster screw.
2. Turn pitman shaft adjuster screw counterclockwise until extended, then back off one full turn. Place INCH-lb. torque wrench in vertical position on end of stub shaft. Measure gear over-center torque by rotating torque wrench attached to stub shaft in a 90 degree arc, 45 degrees on each side of center. (Scheme 16) Record highest degree of arc on each side of center. Record highest reading.
3. Turn adjuster screw in until torque required to rotate stub shaft is 6-10 INCH lbs. (.6-1.1 N.m) greater than reading in step 2). Continue adjustment until over-center reading is within specification. See «LASH ADJUSTMENT PRELOAD»(ref-55269-S30718553632001011700000) table. Tighten adjuster screw lock nut when reading is obtained.

LASH ADJUSTMENT PRELOAD

Scheme 16