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TURBO HYDRA-MATIC 350 TRANSMISSION
7A3-7
No motion in
Reverse or slips
in Reverse
-
(install pressure
gage).
I.
Low oil level.
2. Manual linkage.
3. Oil pressure.
4. Control valve assy.
5. Intermediate servo
6. Low and reverse
clutch
7. Direct clutch
8. Forward clutch
1. Add oil.
2. Misadjusted.
3a. Modulator valve stuck.
b. Modulator and reverse
boost valve stuck.
c. Pump hub
-
direct clutch
oil seal rings broken,
missing.
d. Direct clutch piston seal
cut or missing.
e. Low and reverse clutch
piston seal cut or missing.
f. No. 1 check ball missing.
4a. Valve body gaskets
-
leaking,
damaged, incorrectly installed
(other malfunctions may also
be indicated).
b. 2-3 valve train stuck in
up-shifted position. This will
also cause 1-3 upshift in
drive range.
c. 1-2 valve train stuck in
upshifted position.
5. Piston or pin stuck so
intermediate overrun band
is applied.
6. Piston out or seal
damaged or missing.
7a. Outer seal damaged or
missing.
b. Clutch plates burned-
may be caused by stuck ball
check in piston.
8. Clutch does not release
(will also cause Drive in
Neutral).
Slips in all ranges,
slips on take-off
-
(install pressure
gage)
1. Oil level low.
2. Oil pressure.
3. Case
4. Forward clutch
1. Add oil.
2a. Vacuum modulator
inoperative.
b. Vacuum modulator valve
sticking.
c. Filter assy
-
plugged
or leaks.
3a. Pressure regulator valve
stuck.
b. Pump to case gasket damaged
or incorrectly installed.
4. Cross leaks, porosity.
a. If burned, look for cause.
b. Oil seal rings on pump
cover broken or worn.
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