Motor Trouble-Shooting (9)

Problem:
The motor, at start up, makes a loud rubbing or grinding noise.

Like Causes:
Rotor may be striking stator.

What To Do:
Ensure that motor was not damaged in shipment. Frame damage may not be repairable. If you cannot see physical damage, inspect the motor’s rotor and stator for strike marks. If signs of rubbing are present, the motor should be replaced. Sometimes simply disassembling and reassembling motor eliminates rubbing. Endbells are also sometimes knocked out of alignment during transportation.

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