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TURBO HYDRA-MATIC 3 5 0 TRANSMISSION
7A3-5
TURBO HYDRA-MATIC 350 TROUBLE DIAGNOSIS
CHART
CONDITION
POSSIBLE CAUSE
CORRECTION
No drive in drive
1.
Low oil level.
1. Correct level
-
check for
range
-
(install
external leaks or vacuum
pressure gage).
modulator (leaking diaphragm
will evacuate oil from unit).
2. Manual linkage
2. See Page 7A3-14.
adjustment
3. Low oil pressure.
3a. Filter assembly-blocked.
b. Pump assembly-pressure
regulator, pump drive gear,
tangs damaged by converter.
c. Case-porosity in intake bore.
4. Manual valve disconnected
from inner lever.
5a. Forward clutch does not
apply
-
piston cracked; seals
missing, damaged; clutch plates
burned.
b. Pump feed circuit to forward
clutch oil seal rings missing
or broken on pump cover; leak
in feed circuits; pump to case
gasket mispositioned or damaged.
c. Clutch drum ball check stuck
4. Control valve assy.
5. Forward clutch.
6 . Roller clutch assy.
or missing.
6. Broken spring or damaged
cage.
Oil pressure high
or low
1. High oil pressure
2.
Low oil pressure
la. Vacuum line or fittings
leaking.
b. Vacuum modulator.
c. Modulator valve.
d. Pressure regulator.
e. Oil pump.
2a. Vacuum line or fittings
obstructed.
b. Vacuum modulator.
c. Modulator valve.
d. Pressure regulator.
e. Governor.
f. Oil pump.
-
- -
1-2 shift
-
full
1. Detent valve
1. Sticking or linkage misadjusted.
throttle only
2. Vacuum leak
2.
Vacuum line or fittings leaking.
3. Control valve assy.
3a. Valve body gaskets
-
leaking,
damaged, incorrectly installed.
b. Detent valve train stuck.
c. 1-2 valve stuck.
4. Case assembly
4. Porosity.
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