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He is suggesting that the vibration may be from worn seals/bearings, out of balance impeller, etc. It may be time to re-build the pump in the near future. Some guys are good enough to do motor maintenance/re-building too. I never have been. If the motor/motor winding is bad, I call for a new motor and scrap the old one at the salvage yard. On that note, motor windings are a real good source of cash as copper scrap.
