DC Motor Troubleshooting
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Motor won't start
Motor Hesitates when starting
Hums, will not start
Hums, starts if shaft is turned
Motor won't start, shaft turns back and forth rapidly
Motor trips breaker or blows fuse instantly
Motor vibrates loudly
Motor runs very hot
Motor won't start sometimes
Shaft radial looseness (side to side, up & down)
Shaft axial looseness
Contactor overload trips
Motor won't reverse rotation
Motor starts, runs wrong rotation
Motor runs too slow
Motor runs too fast
Shaft is discolored, blue
Loud, rubbing or grinding sound
Shaft will not turn freely or at all
Motor speed is unsteady-surges,sags