chevrolet truck Light Duty Truck 1994 Series, Repair Manual

Page: 74 / 919

Key No. Part Name Key No. Part Name
1 - RING, RETAINING
32 SEAL, DOUBLE LIP
2 - PLUG 33 WASHER, BACKUP
3 - SEAL, O-RING 35 RING, RETAINING
5 - RING, TEFLON 36 WASHER, LOCK
6 - SEAL, O-RING 37 NUT
7 - COVER, SIDE 38 SEAL
8 - NUT, ADJUSTER LOCK
40 SHAFT, STUB
10- BOLT 41 SPOOL, VALVE
11 - GASKET
42 SEAL
12- SHAFT, PITMAN
43 BODY, VALVE
1 3 -SHAFT, WORM 45 SEAL, O-RING
1 5 - RACE
46 RING
16- BEARING, THRUST
47 SPACER
1 7 - RACE
48 NUT, ADJUSTER PLUG LOCK
1 8 - VALVE, CHECK
50- RING, RETAINING
20 - HOUSING 51 - SEAL, DUST
21 - SCREW 52- SEAL, LIP
22 - CLAMP 53- BEARING, NEEDLE
23 - GUIDE, BALL 55- PLUG, ADJUSTER
25 - BALLS 56- SEAL, O-RING
26 - PISTON, RACK 57- RACE
27 - PLUG 58- BEARING, THRUST
28 - BEARING, NEEDLE 60- RACE
30 - SEAL, SINGLE LIP
61 - SPACER, BEARING
31 - WASHER, BACKUP 62- RETAINER, BEARING
Figure 2 708 Power Steering Gear - Legend
STEERING GEAR ADJUSTMENTS
Important
• Before any adjustments are made on the steering
gear, refer to “Steering, Suspension, Tires and
Wheels Diagnosis” (Section 3) for reviewing the
possible steering system problems. Any steering
gear adjustment is made only as a correction and not
as a periodic adjustment.
For proper adjustment, remove the steering gear from the
vehicle. Drain the power steering fluid from the gear. Mount
the gear in a vise and make the following adjustments.
The steering gear requires two adjustments:
• The worm thrust bearing preload
• The pitman shaft over-center preload
adjustment
The worm thrust bearing preload is controlled by the
amount of compression force exerted by the adjuster plug
on the conical worm bearing thrust races.
The pitman shaft over-center preload is controlled by the
pitman shaft adjuster screw, which determines the clearance
between the rack piston and the pitman shaft sector teeth.
|
9
| Important
Adjust the Worm thrust bearing preload first, then
adjust the pitman shaft over-center preload.
WORM THRUST BEARING PRELOAD
ADJUSTMENT
Figures 1 thru 6
Tool Required:
J 7624 Spanner Wrench
1. Remove steering gear from vehicle. Refer to
“Power Steering Gear Replacement” in Section 3B.
2. Rotate stub shaft (40) back and forth to drain power
steering fluid.
3. Remove ad juster plug lock nut (48) from
housing (20).
Notice: Be careful not to cause any burrs on the back face
of the locknut during removal. A burr on the locknut can
affect valve alignment and steering effort.
Notice: See “Notice” on page 3B1A-1 of this section.
4. Turn adjuster plug (55) in (clockwise) using J 7624
until adjuster plug (55) and thrust bearing (58) are
firmly bottomed in housing (20).
^ Tighten
• Adjuster plug (55) to 30 N*m (22 lb. ft.).
5. Place an index mark on housing (20) even with one
of the holes in the adjuster plug (55).
6. Measure back counterclockwise 13 mm (1/2 inch)
and place a second mark on housing (20).