GMC 1976 ZEO 6083 Maintenance Manual page 561

Figure 37-Removing Spool Valve
CAUTION : Do not pull the shaft assembly
out too far or the spool valve may become
cocked in the valve body.
c. Carefully disengage the shaft pin from the
valve spool and remove the shaft assembly (figure
36).
3. Push the spool valve out of the flush end of the
valve body until the dampener "O" ring is exposed
then carefully pull the spool from the valve body,
while rotating the valve (figure 37). If the spool valve
becomes cocked, carefully realign the spool valve,
then remove .
4. Remove the dampener "O" ring from the spool
valve and discard.
5 . If the teflon oil rings are to be replaced, cut the
three teflon oil rings and "O" rings from the valve
body and discard.
Cleaning and Inspection (Figure 38)
1 . Wash all parts in clean solvent and blow out
all oil holes with compressed air.
2 . If the drive pin in the stub shaft or valve body
is cracked, excessively worn or broken, replace the
complete valve and shaft assembly .
3. If there is evidence of leakage between the
torsion bar and the stub shaft or scores, nicks, or
burrs on the ground surface of the stub shaft that
cannot be cleaned up with crocus cloth, the entire
valve assembly must be replaced .
STEERING
9- 2 9
_.TEFLON RINGS (3)
"O" RINGS (3) -
INSTALLED UNDER
TEFLON RINGS
Figure 38-Valve Body and Shaft Assembly
4. Check the outside diameter of the spool valve
and the inside diameter of the valve body for nicks,
burrs, or bad wear spots. If the irregularities cannot
be cleaned up by the use of crocus cloth, the com-
plete valve and shaft assembly will have to be re-
placed .
5 . If the small notch in the skirt of the valve body
is excessively worn, the complete valve assembly will
have to be replaced . See Figure 39 .
6. Lubricate the spool valve with Power Steering
Fluid and check the fit of the spool valve in the valve
body (with the spool valve dampener "O" ring
removed) . If the spool valve does not rotate freely
without binding, the complete valve and shaft assem-
bly will have to be replaced .
Figure 39-Installing Stub Shaft Assembly