GMC 1989 Light Duty Truck Repair Manual page 122

3B3-8 POWER STEERING
Figure 18—Aligning the Adjuster Hole with the Second
Mark
N. B lo c k Tooth
O ver-C enter
O.
Preload A d ju s te r
Figure 19— Pitman Shaft " Over-Center" Sector
Adjustment
A. In sta ll P itm an
S h a ft B earing
Figure 20— Installing the Pitman Shaft Bearing and
0
F-01872
B. In s ta ll P itm an
S h a ft Seals
F-01809
Seals
A. Torque W re nch
B. 12 P o in t S o c k e t
227. N ut
222. A d ju s tin g S cre w
251. S tu b S h a ft
a
B -----------------
Figure 21—Aligning the Over-Center Preload
• Rotate the adjuster to the left until the hole in the
adjuster is in line with the second mark (figure
18).
NOTICE: R efer to " N o tic e " on p ag e 3B-1 o f this
m anual.
• Install the adjuster nut (245) and torque the nut
to 108 N-m (80 ft. lbs.). Hold the adjuster plug to
maintain alignment of the hole with the mark.
• Check the turning torque of the stub shaft,
using J 7754-01 and a 12-point socket. The
reading should be taken with the beam of the
wrench near vertical while turning the wrench to
the left at an even rate (figure 19).If the reading
is less than 0.45 N-m (4 in. lbs.) or more than
1.15 N-m (10 in. lbs.), repeat the adjustment
procedure.
• Lubricate the stub shaft (251) area outside the
dust seal (206) with chassis lubricant or an all
purpose grease.
Rack piston (214) using J 21552 (figure 4).
Bearing (209) using J 22407 and J 8092.
Washers (207) and seals (208) using J 6219 (figure
20
).
• 1989 Interim: Washer (207) and seal (254) using
J 6219 (figure 1).
Retaining ring (205).
Dust seal (253).
Gasket (224).
Pitman shaft (221), side cover (225), nut (227) assem­
bly.
Bolts (226).
Adjust (Figure 21)
Tool Required:
J 7754-01 Torque Wrench
Pitman shaft preload (figure 21).
Attach tool J 7754-01 and a 12-point socket on
the stub shaft splines.
2 Center the steering gear by turning the stub
.
shaft (251) from right to left and counting the
number of turns. Turn the shaft back halfway to
the center position.
^
2 2 2 227
s * j 1
J
Jhsa
F-04929