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

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Motor hums but door will not open or close.

I have a 1/2 HP Craftman Part #41A4315-7A (5-94) HBQ0777, garage door opener. I am told by Sears that this is an old opener and no longer available. I would like to know what would be compatable with this motor so I don't have to replace the whole thing. There are two big springs that are pulled by cable on either side of the door and one chain in the middle of the door.

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  • Anonymous Jan 23, 2009

    I have the same problem, and when I removed the cover the gears where turned into a big pile of powder = no Gears left!

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Well Good thing is that sears openers have not changed much int eh way they are hooked up. If you have a chain drive you can pretty much buy and chain drive sears opener and it should bolt right up. But you might have to run safety sensors as of 1993 they have to be on all openers. Also if you are going to do a motor head change out make sure your chain and door are in the closed position. All openers will start up once they are plugged in

Posted on Feb 10, 2009

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Have you increased the WORK setting on the unit? springs get weaker over time, and the opener must be adjusted.
Look on the rear of the unit for an adjustment knob labeled WORK or FORCE.
Increase the setting, and re-try.

Posted on Jan 12, 2009

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Posted on Jan 02, 2017

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