TM 9-2350-277-20-2
PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS), INCLUDING
LUBRICATION INSTRUCTIONS — Continued
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ITEM
NO.
INTERVAL
MAN-
HOUR
ITEM TO BE
CHECKED OR
SERVICED
CREWMEMBER
PROCEDURE
EQUIPMENT
NOT READY/
AVAILABLE
IF:
c. Remove the four bolts, washers and gasket from
the access cover under the vehicle directly under
the powerpack.
d. Push the hydraulic hoses to the side and look
into the access opening.
You will see the rear bottom side of the engine’s
flywheel cover as well as a 2’’ by 3’’ opening on
the flywheel cover in the six o’clock location.
e. On a sharp angle through this opening, you will
see the back side of the flywheel, as well as the
clearance holes on the flywheel but through the
opening you can only see one hole at a time.
f. Looking at the clearance holes, you can also see
the studs and locking nuts that hold the spline
drive ring in place. The spline drive ring studs
and nuts are designed to protrude into the
flywheel’s clearance holes and clear the
flywheel’s holes by approximately 1/4’’.
g. As in the audio method, use the 3/8’’ bolts and
the breaker bar to detect any backlash. Turn the
engine manually to position one of the
flywheel’s clearance holes in the center of the
flywheel’s cover opening for visual accessibility.
h. As the person in the crew compartment moves
the engine, the person under the vehicle looking
into the access hole will be able to detect one of
the following two relative movements on the
spline drive coupling.
1) When the spline drive coupling is in good
condition, you can only detect unit
movements because the clearance between
the mating spline teeth is just a few
thousandths of an inch.
0155 00-172
