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TURBO HYDRA-MATIC 400 AUTOMATIC TRANSMISSION
7A4-37
REAR
INTERNAL
GEAR
a
Fig.
7A4-62
Removing Rear Internal Gear
-
Mainshaft
OVERHAUL OF
GOVERNOR ASSEMBLY
All components of governor assembly, with exception of
driven gear, are a select fit and each assembly is calibrated.
The governor, including the driven gear, is serviced as a
complete assembly. However, the driven gear can also be
serviced separate] y.
It is necessary to disassemble governor assembly in order
to replace driven gear. Disassembly may also be necessary due
to foreign material causing improper operation. In such cases,
proceed as follows:
Disassemble Governor
1. Cut off one end of each governor weight pin and
remove pins, governor thrust cap, governor weights and
springs. Governor weights are interchangeable from side to
side and need not be identified (Fig. 7A4-63).
2. Remove governor valve from governor sleeve. Be
careful not to damage valve or sleeve.
3. Perform the following inspections and replace
governor driven gear, if necessary.
Inspect Governor
1. Wash all parts in cleaning solvent, air dry and blow
out all passages.
2. Inspect governor sleeve for nicks, burrs, scoring or
galling.
3. Check governor sleeve for free operation in bore of
transmission case.
4. Inspect governor valve for nicks, burrs, scoring or
galling.
5. Check governor valve for free operation in bore of
governor sleeve.
6. Inspect governor driven gear for nicks, burrs or
damage.
MAJOR UNITS
7. Check governor driven gear for looseness on governor
sleeve.
8. Inspect governor weight springs for distortion or
damage.
9. Check governor weights for free operation in their
retainers.
10. Sleeve must be tight in carrier.
GOVERNOR DRIVEN GEAR
Replace
To facilitate governor repair in the field, a governor
driven gear and replacement pins are available for service use.
The service package contains a nylon driven gear, two
governor weight retaining pins and one governor gear retainer
split pin. Replacement of gear must be performed with care
in the following manner:
1. Drive out governor gear retaining split pin, using
small punch (Fig. 7A4-64).
2. Support governor on 7/64" plates installed in exhaust
slots of governor sleeve, place in arbor press and, with long
punch, press gear out of sleeve.
3. Carefully clean governor sleeve of chips that remain
from original gear installation.
4. Support governor on 7/64" plates installed in exhaust
slots of sleeve, position new gear in sleeve and, with suitable
socket, press gear into sleeve until nearly seated. Carefully
remove any chips that may have shaved off gear hub and press
gear in until it bottoms on shoulder.
5. A new pin hole must be drilled through sleeve and
gear. Locate hole position 90" from existing hole, center
punch and then, while supporting governor in press, drill new
hole through sleeve and gear using a standard 1/8" drill.
6. Install retaining pin.
7. Wash governor assembly thoroughly to remove any
chips that may have collected.
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