GMC 1976 ZEO 6083 Maintenance Manual page 508

7- 6 0 TRANSMISSION
Figure 87-Air Check Forward Clutch Piston
11 . Air check forward clutch and piston operat-
ion, Figure 87 .
INSTALL FORWARD CLUTCH
1 . Install Front Unit End Play Checking Tool,
J-22241 into forward clutch, Figure 36 .
2. Install forward clutch assembly into transmis-
sion, making certain main shaft goes into forward
clutch hub. It will be necessary to rotate clutch hous
ing to allow direct clutch driving hub to index with
direct clutch composition-faced plates .
3. Remove Front Unit End Play Checking Tool,
J-22241 .
INSTALL PUMP COVER PLATE
1 . Install new pump cover plate gasket on trans-
mission.
A-9 BOLTS '/16-18X .750
B-9 BOLTS 5/16-18X .875
C-1 BOLT 5 /16-18 X 1 .00
D-4 BOLTS 5/16-18 X 1 .125
E-5 BOLTS 5 /16-18X .875
F-b BOLTS 5/16-18X1 .50
Figure 88-Pump Cover Plate Screws
A-2197
2. Install pump cover plate on transmission and
install attaching bolts per bolt chart, Figure 88 .
NOTE :
Do not install pump attaching bolts (F)
or single bolt (E) in pump cover plate at this
time .
3 . Using the driven sprocket as a driver rotate the
forward clutch .
NOTE :
If the forward clutch housing cannot be
rotated as the pump cover plate is being pulled
into place, the forward or direct clutch housings
have not been properly installed to index with all
the clutch plates . This condition must be cor-
rected before the pump cover plate is pulled fully
into place.
4. Torque all bolts to 20 foot-pounds.
5. Repeat front unit end play check as described.
6. Install remaining bolt (E) in driven support
housing, tightening to 20 foot-pounds.
OIL PUMP
DISASSEMBLY
1 . Mark drive and driven gears for reassembly in
same position and remove the pump body .
NOTE:
Installing the gears in the same position
as removed will assure the quietest operation, as
the gear teeth will mesh in the established wear
pattern.
2. Remove drive and driven gears from pump
body .
3. Remove and discard pump body to case
square-cut O-ring seal .
INSPECTION
1 . Using tip of finger, inspect gear pocket and
crescent for nicks, burrs, scoring or galling.
2. Inspect drive gear for nicks, burrs, scoring, or
galling.
3. Inspect driven gear for nicks, burrs, scoring, or
galling.
4. Place pump gears in pump body and check
pump body face to gear face clearance. Clearance
should be .0013"-.0035" .
5 . Check face of pump body for nicks, burrs,
scoring, or galling.