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

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Craftsman Garage Door Opener Won't Open

All of a sudden today the motor for the garage door opener runs but the chain doesn't move and the door doesn't open. Any suggestions?

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  • darapegg Dec 08, 2008

    Because it's way too cold here this time of year to live without an opener and because my husband isn't really very handy, I did have a garage door repair person come over. It was indeed a stripped gear. Thanks for your help.

  • boobooqt Dec 29, 2008

    The garage door motor works but the chain is not moving.

  • mary kay Nap Feb 26, 2009

    Hi reschlud
    i have the same problem - how do I check the motor box? Will I see it if I get up there?
    Thanks

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When mine did this, it was because the nylon gears that drive the chain had stripped. My wife had to live without the opener for a week or more, but I was able to find a new gear kit online and replace the damaged gears. It wasn't difficult.
The other option is to buy a new opener.

Posted on Dec 07, 2008

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Check the gear on top of the motor box.A set screw probably came loose that holds the chain gear to the motor shaft.

Posted on Dec 10, 2008

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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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If the motor is working but the chain does not move you must remove the cover on the motor and check to see that the chain is on the sprocket. If the chain is on the sprocket and the sprocket is not moving but the motor shaft is moving then the sprocket must be retightened onto the motor shaft.

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