GMC 1976 ZEO 6083 Maintenance Manual page 488

7- 40
TRANSMISSION
REMOVE OIL PUMP
1 . Remove two opposite pump attaching bolts
from the drive support housing.
2. Install two 5/16-18 x 4" guide pins in holes
from previously removed bolts.
3 . Remove the remaining pump attaching bolts
from the drive support housing.
4. With one hand hold the underside of the pump
and gently tap the guide pins until the pump is
removed from the case .
REMOVE PUMP COVER PLATE,
CONVERTER OUT CHECK VALVE
AND DRIVE AND DRIVEN
SUPPORT HOUSING
ASSEMBLIES
1 . Remove the twenty-three pump cover plate-to-
case attaching screws and remove pump cover plate.
Do not remove sprocket support housing bolts at this
time .
2 . Remove pump cover plate and plate-to-case
face gasket . Discard gasket .
NOTE : Drive and driven support housing assem-
blies are pressed into and removed with the
pump cover plate. Do not remove them unless it
is necessary.
3. If necessary, remove oil seal rings from the
driven support housing. See Figure 37 .
4. Remove the front unit end play selective thrust
washer from the hub of the driven support housing.
5 . If necessary to remove the drive and driven
sprocket support housing assemblies, proceed as fol-
lows :
a. Remove the remaining sprocket support to
pump cover plate attaching bolts.
b. Support cover plate on wooden blocks and
using a plastic mallet, vigorously strike the stator
shaft of the drive sprocket support, Figure 38, and
the hub of the driven sprocket support, until they are
removed from their pump cover plate bores.
CAUTION:
When driving the housings out of
the pump cover plate, avoid damaging or
Figure 38-Removing Drive Sprocket Support
c. Remove and discard housing to pump
cover plate gaskets.
39 .
distorting the stator shaft or the ring
grooves in the hub ofthe driven housing by
striking the shaft or hub centrally .
d. Remove converter out check valve, Figure
e. Install converter out check valve.
f. Install drive sprocket support housing to
pump cover plate gasket .
g. Install drive sprocket support housing into
pump cover plate by using a plastic mallet to seat the
housing. Use bolts for guides, Figure 40 .
h. Install driven sprocket support housing to
pump cover plate gasket .
i. Install driven sprocket support housing to
pump cover plate attaching bolts for gasket guides .
j. Install driven sprocket support housing into
pump cover plate by using a plastic mallet to seat the
housing.
k. Install all but one driven support housing
to pump cover plate attaching bolts. Torque to 20 ft .
lbs.
6. Install proper front unit end play selective
thrust washer on the hub of the driven sprocket sup-
port housing. Use micrometer to determine the ac-
tual thickness of the thrust washer .
7 . If necessary, install oil seal ring into the
grooves in the hub of the driven sprocket support
housing. See Figure 37 .