GMC 1990 Light Truck Repair Manual page 120

3B3-6 POWER STEERING
A. Guide Halves
213. Balls
B. Petroleum Jelly
Figure 13—Retaining the Balls In the Ball Guide
A. J-7079-2
B. J-8524-1
C Bearing with
Identification
Towards Tool
D. Wood Block
Figure 14— installing the Needle Bearing
240. Adjuster Plug
251. Stub Shaft
Figure 15— Bottoming the Adjuster Plug
A. Mark
B. Adjuster
Hole
251. Stub Shaft
B6518
Figure 16—Marking the Housing
• Retain the balls in the guide with petroleum
jelly.
3. Ball guide (212), clamp (211) and screws (210) to
the rack piston (214).
4. Stub shaft (251) into the valve body (250) (figure
10 ).
• Lubricate the stub shaft (251) with power steer­
ing fluid.
5. Valve spool (252) and seals (230, 231) into the
valve body (250).
• Lubricate the valve spool (252) and seals (230,
231) with power steering fluid before assem­
bling.
6. Valve body (250), seal (249), wormshaft (248),
bearing races (246) and roller bearing (247).
7. Seal (239) on the adjuster plug (240).
8. Needle bearing (241) in the adjuster plug. Use
J 8524-1 and J 7079-2 (figure 14).
B6503
9. Seal (242), washer (243), and retaining ring (244)
in the adjuster plug (240).
Important
• The retainer projections must not extend beyond
the washer (243) when the retainer ring (244) is
seated. The washer must be free to rotate.
10. Wormshaft, valve assembly into the steering gear
housing.
11. Adjuster plug (240) into the steering gear housing.
Use spanner wrench J 7624.
Adjust (Figures 15 through 22)
Tools Required:
J 7624
Wrench
1. Bearing preload:
• Use tool J 7624. Turn the adjuster plug (240)
B6531
to the left until the plug and bearing (237) are
firmly bottomed - about 27 N m (20 ft. lbs.)
(figure 15).
• Mark the housing in line with one of the holes
in the adjuster plug (figure 16).
Spanner Wrench J 7754-01
B6532
Torque