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

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My garage door opener suddenly started giving me problems a few days ago. it opens after i pull away so i was using it manually and now the chain came off what should i do. I also have a remote that did not come with it that i had to program

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If the chain came off the bronze bushing on the gear/sprocket assembly has most likely worn out and will need to be replaced. This would also let the door close too far, hit the floor and reverse to the open position. The door also needs to be checked for balance. Weak springs can cause all this.

Posted on May 27, 2010

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