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

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Craftsman opener motor works, but chain does not move.

Craftsman opener quit operating the door. The motor works but the chain does not move and open/close the door. Any thoughts would be much appreciated.

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  • Greg Waddell Apr 20, 2009

    The door will open manually, so I beleive the springs are not broken, but I will double check. The sprocket situation sounds like a more likely possibility. I will check on that when I return home from work. Thank both of you for the possibilities.

  • Algallery Apr 27, 2009

    The horizontal ring gear has lost all of its teeth. They were apparently ground off when door stopped opening.

  • aklarichjr May 11, 2010

    look at the springs above your door from the inside when its closed....they may be broken

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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.

Posted on Apr 20, 2009

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es la estrella de plastico que esta desgasta, solo abre el motor y cambiala por otra el costo es de 10dlls mas omenos, si nesecitas hayuda mi msm es cissat_alex@hotmail.com

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Everything is moving but the door isn't opening


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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.

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