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Master
3,197 Answers
- Posted on Apr 08, 2010
Re: Liftmaster garage door squeaks very loudly, I have...
This is usually caused by a bad bearing on the shaft of the Gear and Sprocket Assembly. When it wears enough it will also let the chain come off the sprocket. If you look at the sprocket closely you can usually see that the shaft is leaning toward the door.
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