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7A1-12
1 9 7 7 PONTIAC SERVICE MANUAL
HYDRA-MATIC (200) DIAGNOSIS CHART
TRANSMISSION PROBLEMS AND RELATED CAUSES
PROBLEM
POSSIBLE CAUSE
POSSIBLE CONDITION
NO DRIVE IN DRIVE
A. Low Oil Level
1. Incorrect level.
RANGE (Check Oil
2. External leaks.
Pressure)
B.
Manual Linkage
1. Maladjusted.
C. Low or No Oil Pressure
1. Pump
-
pressure regulator
valve stuck with chips or burrs
2. Pump drive or driven gear
damaged or broken.
3. Cup plugs missing from pump
cover.
4. Plugged or restricted oil
screen.
5. Oil screen gasket off
location.
6. Case-porosity in intake bore
D. Control Valve Asm.
1. Manual valve disconnected
from inside detent lever pin.
2. Control valve assembly
gasket mis-positioned.
E. Forward Clutch
1. Forward clutch does not
apply
-
piston cracked
seals missing, damaged;
clutch plates burned; snap
ring out of groove.
2. Forward clutch oil seal
rings missing or damaged on
turbine shaft; leak in feed
circuits; pump to case gasket
mis-positioned or damaged.
3. Clutch housing check ball
stuck or missing.
4. Cup plug leaking or
missing in the rear of the
turbine shaft in the clutch
apply passage.
5. Wrong forward clutch apply
ring or wrong number of
clutch plates.
6. Feed orifice plugged in
turbine shaft.
7. Turbine shaft not welded
to housing.
8. Feed passage in turbine
shaft intersecting lube
passage.
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