neither of mine make any noise, i just adjusted for alignment and it got rid of it. make sure you have your pump setup for the correct thickness of the glass you have it on. i dont remember the name of it but the rubber boot that goes over the motor half is adjustable. if you remove it completely from your motor it will tell you where to line up the slot for the thickness of the glass, also depending on the thickness of glass you may have to replace the bearing with the one they send with it. hope this helps and doesnt confuse you more.
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