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

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THE DOOR IS NOT GOING ALL THE WAY UP AND WHEN IT CLOSES IT GOES DOWN AND LIFTS BACK UP HELP!!

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  • Don Maggard May 11, 2010

    Have you made any repairs to this or did this just start on it's own?

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Loosen the chain and remove it from the sprocket on top of the motor. Then run the opener until the sprocket turns counterclockwise and stops. Now with everything still hooked up and the door in the open position replace and tighten the chain. This should get you close to where you want to be and some minor adjustments of the up and down limit controls should do it.

Posted on Jul 22, 2009

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Posted on Jan 02, 2017

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