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7A4-58
1977 PONTIAC SERVICE MANUAL
Fig.
7A4-129
Vacuum Modulator
-
Cross Section
5. Inspect modulator valve for nicks or damage.
6. Check freeness of valve operation in case bore.
Once the modulator assembly passes all of the above
tests, it is an acceptable part and should be re-used.
M A N U A L A N D PARKING
LINKAGE
1. Inspect parking actuator rod for cracks or broken
spring retainer lugs (Fig. 7A4-130).
LOCK
RETAINING-
N U T
OETENT ROLLER A N D
PARKING?RAKE PAWL
A
PARKING BRAKE
PAWL SHAFT
PARKING PAWL
R E T U R N SPRING
\PAWL
SHAFT COP"
2703
Fig.
7A4-130
Manual and Parking Linkage
-
Exploded
View
2. Inspect actuator spring for damage.
3. Inspect actuator for free fit on actuator rod.
4. Inspect parking pawl for cracks or wear, if removed.
5. Inspect manual shaft for damaged threads or loose
lever.
6. Inspect inside detent lever for cracks or a loose pin.
7. Inspect parking pawl shaft for damaged retainer
groove, if removed.
8:
Inspect parking pawl return spring for deformed coils
or ends.
9. Inspect parking bracket for cracks or wear.
10. Inspect detent roller and spring assembly.
CASE ASSEMBLY
1. Inspect case for cracks, porosity or inter-connected
passages (Figs. 7A4- 13 1 and 132).
CA U TI 0 N
:
If the case assembJy requires
replacement, make sure that the center support-to-
case spacer is removed fiom the old case and
reinstalled in the new case.
NOTE: If the case assembly requires replacement,
remove the nameplate from the old case and reinstall it
onto the new case, using the truss head nameplate
attaching screw that is serviced with the case.
-
I
I
INF
.
DRIVE
MODULATOR
Fig.
7A4-13 1
Case Passages
-
Front View
Fig.
7A4-132
Case Passages
-
Bottom View
2. Check for good retention of band anchor pins.
3. Inspect all threaded holes for thread damage.
4. Inspect intermediate clutch plate lugs for damage or
brinneling.
5. Inspect internal case snap ring grooves for damage.
If grooves are broken, it is caused by either incorrectly
installed snap rings and/or spacer or by high oil pressure
causing excessive forces (the usual cause of high pressure is
found in the pressure regulator valve system).
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