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

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Sears Craftsman 3/4

Can you help?

My gears were finally shredded on my 15+ y/o Crafstman 1/2hp motor - so I replaced it with a 3/4 new model. I left the door hardware and simply replaced the motor, kept the chain. I have a 15 ft wooden door.

It worked very well for about two days after I had dialed it in using the force/travel adjustments, but yesterday, it started bouncing up off the floor. I turned down the down travel as far as I could go (and it still bounced). It looks like its really pushing hard when the door is closed, then reverses.

I played with both force and travel - and nothing seems to work.

The upward travel works like a charm, I can dial that in to stop 2-3" from the stop bolt - and it works as it shoud. Down travel seems "broken."

Any thoughts?

Posted by on

  • tvaughn243 Jan 09, 2009

    It was a new motor - so I assumed that it was right when it came to me in the box. I opened up the case, and sure enough had a broken part.

    The small metal "t" that travels between the up and down travel limits was broken. Travel assembly was replaced - and door works PERFECTLY.



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  • 98 Answers

Open up the caseand look at the travel assy. Sometimes the limit (up or down) do fall off the assy. Just snap it back on.

Posted on Jan 09, 2009


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