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

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Craftsman 1\2 hp clicks, motor wurrs for 1 sec', but doesn't open

My 13 year old Craftsman unit suddenly quit working. All it does when the control button is pushed, is a click the light comes on and then a wurr from the motor for about a second and then it quits.
I have disengaged the door fron the chain, but the same happens.

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  • Pete Feb 26, 2009

    I guess the "wurr" is more of a buzz. The motor does not move and the gears are in good shape with little or no wear.

    It seems that the motor is in a bind or the starter/circuit board has a problem.




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You have a stripped gear on the opener. Take off the cover on the motor. The bottom of the cover will be filled with white shavings. You can repair this with a "liftmaster gear and sprocket assembly".

Posted on Feb 26, 2009

  • Vince Heuser Feb 26, 2009

    The trolley is probably pinned against the stop bolt. If so, loosen the screw on the trolly and take the chain off the sprocket on top of the motor. move the trolly a few inches off the bolt and put the chain back on. You will have to adjust the limit screws on the side of the opener. Test the limits with the door disengauged to get close and then fine tune with the door attached. Make sure the force settings are not turned up above five. They are the blue screws on the back of the opener.


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