GMC C Series 1993, Repair Manual

Page: 52 / 264

3B1A-10 POWER STEERING GEAR UNIT REPAIR
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1.
2.
3.
4.
Assemble
• Lubricate new rings (27) and seals (26). 1
N ew seals (26) in the ring grooves. ;
New rings |(27) in the grooves over the seals (26).
• Lubricate valve spool seal (29).
Seal (29) over the valve spool.
• Lubricate the valve spool and the valve ;
body ( 2 8 ) . , . X. .• V<\- j1' ■.!;]
5.
(see Figure 21). . ;•;:!
• Rotate the valve spool while pushing it
into the valve body. Push until the shaft
pin hole is visible from the opposite end
(see Figure 24): v , :
• Lubricate the stub shaft (31) assembly.
S tu b s h a f t
(31) assembly into the valve spool
until the shaft pin can be placed into the valve spool
(see Figure 22). ;.!}
• Align the notch in the shaft cap with the pini
in the valve body (28).
9
6.
7.
Important
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• . ' ' ■
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Make sure that the shaft cap notch is rnatejd
with the valve body pin before installing thb
Valve body into the gear assembly. ; j
Valve spool and shaft (31) assembly into the?;valvp
body (28). The shaft cap should be below the valve
body notch (see Figure 25). ! 11' N
• Lubricate a new shaft cap to the seal (32).! j
N ew shaft cap and seal (32) into the valye body (28)
assembly. , :
PITMAN SHAFT AND SIDE COVER
Figure 1
l*
Inspect
Bearing in side cover (3). Needles should
rotate freely using finger pressure. Replace
bearing and side cover (3) if necessary , j j
Bearings’ surface in the side cover (3) for
scoring. Replace side cover assembly i f
necessary. r ! :;i •; /
Sealing and bearing surfaces o f the pitman
; shaft (5) for roughness, n icks, or other dabiageU
Replace pitman shaft assembly if necessary .;
Pitman shaft (5) for excessive wear .or
scoring. Check sector gear teeth for wear.
R eplace the pitman shaft assem bly if
necessary..'/ - ' / ' ■ ' ] _!, jj.j;
Pitman shaft (5) adjuster screw threads for
wear. The adjuster screw must be free to turn
with no end play. %
A-BAR, TORSION
31 - SHAFT, STUB ;
Figure 23 Stub Shaft Assembly
A-SHAFT PIN HOLE
B-VALVE, SPOOL
2 8 -BODY; VALVE
Figure 24. Installing the Valve Spool in the Valve Body
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A - NOTCH IN END CAP MUST FULLY ENGAGE
PIN PROJECTING INTO VALVE BODY , j
Figurb 25, Assembling the!Stub Shaft Cap and Valve Body
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