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

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Motor runs but gear doesn't turn on my Craftsman 1/2 HP

Have tried adjusting tension on the chain, cleaning and relubing the chain .

When I push the remote button to operate, I can pull on the chain and the gear will turn about a half turn then stop. The motor continues to run, then seems to reverse and run continuously and doesnt stop until I press the button again.

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  • lboftc Jan 10, 2009

    I am having the exact same problem. Also started today.

  • teruse1 Jan 15, 2009

    I found the solution. Plastic gear inside the housing was badly stripped. Not handy, so had a contractor replace it. He also mentioned that the garage door opener was fine, but the cheap spring that came with the garage door was causing more tension on the gears than the older kind of springs and therefore the plastic gears wear out over time. They replaced the gear; added more tension to the spring and it's working beutifully.

  • marty metzger May 11, 2010

    if gear on top of motor (Sprocket) does not turn, you need new unit, or if handy, you can buy and replace gears.

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What did you pay for near gears. curious. often get stripped gears in cold weather as door is frozen down to ground. if possible, kick door bottom edge with heel to break bound if you suspect it is frozen to ground.

Posted on Jan 15, 2009

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you can order a new gear kit from amazon for $20. It's and easy fix.

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