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

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Chamberline 1/2 hp belt drive opener that stops opening

Opens up to 1 ft and closes fine. Will run when not connected to door. Door will open fine manually. Springs are not broke and were replaced about 2 years ago.

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  • fosfam Jun 16, 2009

    Not very heavy.Twice today it actually worked.Each time after it had been setting quite a while. I did check the springs out pretty well and could not see any breaks, the springs are only about 2 years old.I'm thinking maybe spring adjustment, bad belt,up pressure too low?

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  • Master
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It sure sounds like a broken spring. Sometimes the break can be difficult to see. How heavy is the door to lift manually. This will give you a good idea.

Posted on Jun 15, 2009

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