Question about Sears Craftsman LiftMaster Chamberlain Garage Door Opener Wireless Keypad Model 976LM Security+

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My garage door opener motor runs but the chain does not move and the door does not lift. What could the problem be?

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Remove the cover from the motor unit and I am sure you will find the drive gear is stripped. You will also find what looks like white sawdust. The part number for the gear is 41A2817 and is available at any good door opener service company. It will come with instructions.

Posted on May 11, 2010

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