PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS), INCLUDING
LUBRICATION INSTRUCTIONS Continued
ITEM TO BE
Remember that when the nylon coating on
the spline drive ring teeth is new or in
good condition, the clearance between the
spline drive ring and the flywheel internal
spline is only a few thousandths of an inch.
2) When the spline drive coupling is worn-out,
you will be able to detect the individual
movement between the spline drive ring
studs and nuts and flywheelss clearance
holes. This movement is due to the actual
wear of the spline teeth. The more the wear,
the more the movement.
i. If you should hear the metallic clanking sound,
as mentioned in any one of the above inspection
procedures, immediately notify your direct
support maintenance or supervisor
j. Using these three methods, you will easily be
able to tell the difference between the muffled
sound of a good spline drive coupling and the
metallic clanking of a bad spline drive coupling.
Detecting wear of the kind in its early stages
will reduce down time and keep your M113A3
ready for action.