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

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I have a Sears Craftsman door opener which would not open the door more than a foot off the ground. I turned the adjusting dial for the open(Up) from pos 1 to about pos 3 and the door worked fine...until today. Now the lights come on and the motor runs but the chain drive dooes not move.

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Stripped gears. repair if yu are handy or replace entire unit

Posted on Jan 22, 2009

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Try this.

Loosen the chain enough so that you can remove it from the sprocket above the motor unit. With the door closed run the motor until the sprocket turns clockwise and stops. With everything attached replace and tighten the chain. Some adjusting of the up and down limits will probably be required.


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