Chevrolet 1988 Light Duty Truck Repair Manual page 122

3B3-8 POWER STEERING
A. In s ta ll P itm a n
S h a ft B e a rin g
Figure 21— Installing the Pitman Shaft Bearing
and Seals
• Mark the housing in line with one of the holes
in the adjuster plug (figure 17).
• Measure back (to the left) 13 mm (1 /
re-mark the housing (figure 18).
A. T orque W re n c h
B. 12 P o in t S o c k e t
227. N u t
222. A d ju s tin g S c re w
251. S tu b S h a ft
a
251 • ' ' J l i v '
B
--------------
Figure 22— Aligning the O ver-Center Preload
Figure 23— Installing the Retaining Ring
B. In s ta ll P itm a n
S h a ft S e a ls
F-01869
2 -inch) and
^
222 927
V
J ^ T ^ I
j J
S *
J i f
JP n
1
F-04929
• Rotate the adjuster to the left until the hole in
the adjuster is in line with the second mark
(figure 19).
NOTICE: R e fe r to " N o tic e " on page 3 B - 1 o f
th is m anual.
• Install the adjuster nut (245) and torque the
nut to 108 N m (80 ft. lbs.). Hold the adjuster
plug to m aintain alignm ent 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 w hile turning the wrench
to the left at an even rate (figure 20). 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
adjustm ent procedure.
• Lubricate the stub shaft (251) area outside the
dust seal (206) with chassis lubricant or an all
purpose grease.
2. Rack piston (214) using J 21552 (figure 4).
3. Bearing (209) using J 22407 and J 8092.
4. Washers (207) and seals (208) using J 6219 (figure
21 ).
5. Retaining ring (205).
6. Pitman shaft (221), gasket (224) and side cover
(225).
7. Bolt (226) and nut (227).
A d ju st (F ig u re 22)
Tool Required:
J 7754-01 Torque Wrench
Pitman shaft preload (figure 22).
Attach tool J 7754-01 and a 12-point socket on
the stub shaft splines.
2 C enter the steering gear by turning the stub
.
shaft (251) from right to left and counting the
num ber of turns. Turn the shaft back halfway
to the center position.
3. C heck the com bined ball and bearing preload
by tu rn in g the torque w rench through the
center of travel. Note the highest reading.
4. Tighten the adjusting screw (222) until the
torque wrench reads 0.6 - 1.2 N-m (6-10 in.
lbs.) higher than the reading noted in step " 3."
• The total reading should not exceed 2.25
N m (20 in. lbs.) torque.
NOTICE: R efer to " N o tic e " on pag e 3 B 3 - 1 o f
th is m anual.
T ig h te n
• Nut (227) to 27 N m (20 ft. lbs.).
5. Re-check the preload after tightening the nut
(227).
8. Plug (215), seal (216), ring (217), and seal (218).
9. Plug (219) and retaining ring (220) (figure 23).