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

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When I hit the button to close the door, the unit hums for a little while then quits. Is there something I can do?

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Check to see if the trolley is jammed against the bolt just in front of the motor unit. If it is you can either remove the bolt or loosen the chain just a bit to relieve the strain on the chain and then run the opener until the door closes. While the door is closed locate the 'up limit' control on the side of the motor unit and turn it 2 complete turns in the opposite direction of the arrow printed on the cover. Replace the bolt or tighten the chain.

Posted on Sep 15, 2010

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