16
MotorComponentTestingandInspectionELECTRICVEHICLE-MOTOR
754
Figure16-10BrushRigging
755
Figure16-11BearingRetainingRing
MOTORCOMPONENTTESTINGANDINSPECTION
SeeGeneralWarningsonpage1-2.
ARMATUREINSPECTIONANDTESTING
1.Removethemotorfromthevehicle.SeeMotorRemovalonpage16-4.
2.Removetheendcapandarmaturebyperformingsteps1through7ofMotorDisassemblyonpage16-5.
VisualInspection
•Burned,charredorcrackedinsulation
•Improperlycuredvarnish
•Thrownsolder
•Flaredarmaturewindings
•Damagedarmaturecorelaminations
•Worn,burnedorglazedcommutators
•Dirtyoroilycommutators
•Raisedcommutatorbars
•Wornarmaturebearingorshaft
Adirtyoroilycommutatorshouldbecleanedandwipeddry.Abnormalitiesidentiedduringtheinspectioncanhelp
determineoriginalcauseoffailure.Slightroughnessofthecommutatorcanbepolishedsmoothwith400gritor
nersandpaper.SeefollowingCAUTIONandNOTE.
Page16-82020Precedent,Villager2and4MaintenanceandServiceManual