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Noisy operation of a motor is usually caused by the motor's bearings. Use an instrument that can check the temperature of the bearings. If they are hotter than the surrounding temperature of the motor's frame then change them out for new ones. New bearings should quiet the motor.

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9y ago
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9y ago

The noise is usually caused by vibration. Try mounting the engine on rubber pads.

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Q: What will cause noisy operation of a motor?
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