Checking Feed Port; Checking Exhaust Port; Front Servo-Exploded View; Removing Accumulator Piston From Servo - Pontiac TRANS AM 1977 Service Manual

TURBO HYDRA-MATIC 4 0 0 AUTOMATIC TRANSMISSION 7A4-39
Fig. 7A4-65 Checking Feed Port
Fig. 7A4-66 Checking Exhaust Port
SERVO PISTON
\
SERVO
SPRING
/
SPRING RETAINER
I
FIG. 7A4-67 FRONT SERVO
-
EXPLODED VIEW
4. Remove washer, spring and retainer.
ACCUMULA~OR PISTON
2643
Fig. 7A4-68 Removing Accumulator Piston From Servo
Fig. 7A4-69 Removing E-Ring From Servo Pin
REAR SERVO
INSPECT
1.
Inspect the freeness of accumulator rings in piston
groove.
2. Inspect the fit of band apply (servo) pin in servo
piston.
3. Inspect the band apply (servo) pin for scores or cracks.
4. Inspect accumulator and servo pistons for cracks or
porosity.
NOTE: Refer to Fig.
7A4-70. Do not remove the teflon
oil seal rings from the accummulator piston unless they
require replacement.
I f the tenon inner (small diameter) oil seal nng requires
replacement, use the aluminum oil seal nng, Group No.
4.242, Part No. 8623671 or equivalent. The large diameter
ring groove in the accummulator piston is machined
shallower in order to accept the tenon outer (large diameter)
oil seal k g . If this ring requires replacement, use only the
teflon oil seal ring, Group No. 4.242, Part No. 8627153 or
equivalent.