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

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Door goes down but continues to bounce back up

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If the door reverses when it hits the floor it is traveling too far in the down direction. Locate the 'down limit' adjustment on the side of the motor unit. Turn this control in the opposite direction of the arrow printed on the cover. Some tweaking will be necessary to get it just right.

Posted on Oct 03, 2010

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freetek
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SOURCE: door goes back up part of the time

Make sure the path for the optical sensor isn't obscured by dust or spiderwebs; this can cause erratic operation. Also, the limit switch that should turn off the drive motor just before it contacts the concrete can have an adjustment that has drifted.

Posted on Aug 19, 2009

  • 3197 Answers

SOURCE: My garage door sometimes gets stuck and then goes

Don't tighten the chain. It sounds like you have either a broken door spring or the drive gear in the motor unit is going bad. Release the opener from the door and operate it by hand. It should be easy enough to raise that your wife can do it with no problems and it should stay put when released about waist to shoulder high.

Posted on Jul 28, 2010

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1 Answer

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It sounds like your door is traveling too far in the down direction. Locate the 'down limit' control on the side of the motor unit and turn this control in the opposite direction of the arrow printed on the cover. Some tweaking may be necessary.

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