GMC 1976 ZEO 6083 Maintenance Manual page 518

7- 7 0 TRANSMISSION
4. Install modulator retainer with curved side of
tangs inboard and install attaching screw. Tighten
screw to 18 foot-pounds.
GOVERNOR ASSEMBLY
NOTE:
All components of the governor assem-
bly, with the exception of the driven gear, are a
select fit and each assembly is factory calibrated .
The governor, including the driven gear, is ser-
viced as a complete assembly . However, the
driven gear can also be serviced separately .
GOVERNOR INSPECTION
1 . Wash in cleaning solvent, and blow out all
passages .
2. Inspect governor sleeve for nicks, burrs, scor-
ing or galling .
3. Check governor sleeve for free operation in
bore of transmission case .
4. Check governor valve for free operation in
bore of governor sleeve.
5. Inspect governor driven gear for nicks, burrs,
or damage .
6. Check governor driven gear for looseness in
governor sleeve .
7. Inspect speedometer drive gear for nicks,
burrs, or damage .
8. Check speedometer drive gear for looseness on
governor sleeve .
9. Inspect governor springs for distortion or dam-
age.
10 . Check governor weights for free operation in
their retainers.
11 . Check valve opening at entry and exhaust
( .020" minimum) .
GOVERNOR DRIVEN GEAR
REPLACEMENT
To facilitate governor repair in the field, gover-
nor driven gear and replacement pins are available
for service use. The service package contains a nylon
driven gear and one governor gear retainer split pin.
Replacement of gear must be performed with care in
the following manner :
Figure 104-Installing Governor Gear
1 . Place governor sleeve on a block of wood and
drive retaining pin out, using a small punch or 1/8"
drill rod .
2 . Remove governor driven gear as follows:
a. Insert governor driven gear in a vice .
b. Firmly grip governor sleeve with hands
and twisting and pulling at the same time, pull gover-
nor sleeve away from the governor driven gear.
c. Discard governor driven gear.
3. Remove governor valve and wash all parts in
cleaning solvent and blow off parts.
4. Install governor valve, end with holes last, into
governor sleeve .
5 . Support governor on 7/64" plates, installed in
exhaust slots of sleeve, position new gear in sleeve
and with a 7/16" socket, press gear into sleeve until
seated . See Figure 104.
Figure 105-Drilling Governor Gear Shaft