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

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Motor hums but door doesn't move. If I disconnect door and give chain a horizontal poke, it will move. When I reconnect door it returns to humming, without movement.

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Remove the cover from the motor unit and you will find the drive gear has stripped. White sawdust all over. The part number for the gear kit is 41A2817 and it comes with instructions. It is available at any good door opener service company.

Posted on Feb 04, 2010

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Complete repair instructions for this gear with huge pictures at:
http://dl.dropbox.com/u/1347192/lifter/liftmaster_repair.html

Posted on Feb 11, 2010

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I have a Sears Craftsman garage opener. The garage door motor runs but the chain will not move.

Posted on Feb 12, 2010

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If the motor is running and the chain or belt isn't moving, you have a broken gear in the opener.

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You have a stripped drive gear. Remove the cover from the motor unit and you will find white sawdust all over. The part number for the gear kit is 41A2817 and is available at any good door opener service company. It comes with instructions.

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Update: I remembered that I had a problem with the door reversing too much a while back. It was chattering in the tracks and I could not fix it with lubrication and changing spring tension. So I dialed up the down reversing force. This contributed to the jam-up I had when the lower limit was ignored. If I had a lighter force, it may have at least reversed.

After futzing with it I left it alone for several hours. The motor would hum every few minutes. I was considering cutting power to it overnight. I pressed the remote one more time and the motor ran normally to a limit and stopped. I tested it a few times then reconnected the chain and door. Seems fine now. I suspect an intermitten logic board problem. I'll try lightening up the down force and using it for a while.

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