TM 9-2350-277-20-2PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS), INCLUDINGLUBRICATION INSTRUCTIONS — Continued0155 00ITEMNO.INTERVALMAN-HOURITEM TO BECHECKED ORSERVICEDCREWMEMBERPROCEDUREEQUIPMENTNOT READY/AVAILABLEIF:NOTERemember that when the nylon coating onthe spline drive ring teeth is new or ingood condition, the clearance between thespline drive ring and the flywheel internalspline is only a few thousandths of an inch.2) When the spline drive coupling is worn-out,you will be able to detect the individualmovement between the spline drive ringstuds and nuts and flywheels’s clearanceholes. This movement is due to the actualwear 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 inspectionprocedures, immediately notify your directsupport maintenance or supervisorj. Using these three methods, you will easily beable to tell the difference between the muffledsound of a good spline drive coupling and themetallic clanking of a bad spline drive coupling.Detecting wear of the kind in it’s early stageswill reduce down time and keep your M113A3ready for action.0155 00-173
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