GMC C Series 1993, Repair Manual

Page: 57 / 264

POWER STEERING GEAR UNIT REPAIR 3B1A-15
Adjust
Pitman shaft preload, as follow s (see Figure 39):
1. Attach tool J 7754-01 and a 12-point socket on the
stub shaft splines.
2. Center the steering gear by:
• Counting the number o f turns while turning
the stub shaft (31) counter-clockwise until
bottomed.
• Turn the shaft back half the number o f turns
counted above to centered position.
3. Check the combined ball and bearing preload by
turning the torque wrench through the center o f
travel and recording the highest reading.
4. Tighten the adjusting screw on pitman shaft (5)
until the torque wrench reading is 0.7-1.1 N*m
(6-19 lb. in.) higher than the reading recorded in
step 3.
• The total reading sh ould not e x c e e d
2.25 N*m (20 lb. in.) torque.
NOTICE:
See “Notice” on page 1 o f this section;
5. Tighten the nut (1) to 90 N«m (66 lb. ft.).
6. Recheck the preload after tightening the nut (1).
J 7754-01
19-PLUG, ADJUSTER
Figure 36 Checking the Bearing Preload
Figure 37 Pitman Shaft Gear Teeth
Figure 39 Over Center Preload Adjustment