GMC C Series 1993, Repair Manual

Page: 55 / 264

POWER STEERING GEAR UNIT REPAIR 3B1A-13
GEAR REASSEMBLY
Figures 31 thru 39
Tool Required:
J 6222-A Shaft Seal Protector
J 7624 Spanner Wrench
J 7754-01 Torque Wrench
J 24655
£
Assemble
/
• Lubricate the worm (33), bearing (35), and
races (34) with power steering fluid.
v I
2 .
1. Race (34), bearing (35), and race (34) over the end o f
the worm (33). The race should be installed with the
angled surfaces parallel to each other (see Figure 32).
• Lubricate the valve body seals (26) and
the new shaft cap and seal (32) with power
steering fluid. ;
• Align the narrow notch in the valve body with
the pin in the worm shaft cap (see Figure 33).
Valve (28) and worm (33) assembly into the gear
housing (6). Apply pressure only to the valve body
when installing (see Figure 34).
• The valve body is properly seated when the
oil return hole in the housing is entirely
uncovered.
• Place tool J 6222-A over the end o f the
stub shaft.
3. Adjuster plug (19) assembly into the housing, until
it seats against the valve body (28).
Adjust
1. Bearing preload:
• Use tool J 7624-01. Turn the adjuster plug
(19) clockwise until the plug and bearing’
(22) are firmly bottomed— about 27 N»m
(29 lb. ft.).
• Mark the housing in line with one o f the holes
in the adjuster plug.
• Measure back (counterclockwise) 13 mm
(1 /2 in ch ) and re-mark the h ou sin g
(see Figure 35).
• Rotate the adjuster counterclockwise until
hole in adjuster is in line with the second
mark (see Figure 35).
NOTICE:
See “Notice” on page 1 o f this section.
• Install the nut (14) and torque to 108 N*m
(80 lb. ft.). Hold the adjuster plug to
maintain alignment on the hole with the
mark.
• Check the turning torque using a 3/4"
12-point socket and an inch-pound torque
wrench. Use tool J 7754-01 (see Figure 36).
• Push rack piston (with teeth toward pitman
shaft openings) into the housing until the tool
contacts the center o f the worm.
A-PRESS RAM
45 - BEARING ASM., NEEDLE (PITMAN SHAFT)
Figure 31 Pitman Shaft Bearing Installation
A - MAKE SURE ANGLE OF THRUST RACES
ARE AS SHOWN
Figure 32 Worm Shaft and Bearing
a
-
pi n
B-SLOT 1
2 8 -BODY, VALVE
3 3 -SHAFT, WORM
Figure 33 Notch and Pin Alignment