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

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My 1/3 hp craftsmen door opener just hums when you hit the wall button or remotes in the car. I replaced the starter motor capacitor and nothing changed any ideas?

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Is the door stuck in the open position? If so the trolley is probably jammed against the bolt just in front of the motor unit. Loosen the chain until the tension is removed from the trolley. Run the motor until the door is closed. While the door is closed locate the 'up limit' adjustment on the side of the motor unit and turn this 2 complete turns in the opposite direction of the arrow printed on the cover. Tighten the chain.

Posted on Dec 22, 2010

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  • proy6 Dec 23, 2010

    you nailed it I should have looked at the trolley first. it was jammed on that bolt followed you instructions and it works mint. Thank You

  • ridgewayne Dec 31, 2010

    good advice. it was 5 minute solution to a problem that raised considerations of a unit replacement

  • Bruder_Mann Jul 24, 2011

    Excellent! We just recovered from a horrid power outage with intermittent/ flickering power that wouldve reached havoc with my electronics. While I unplugged those and major appliances I neglected the garage opener. Then this problem occurred. I was sure It was a power surge victim and gonna cost me some major loot. Thanks for the tip. It worked like a champ!!!!!

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