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

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Garage door shakes as if off balance when closing

Our garage door shakes when closing as if it is off balance. Sometimes so much that it causes the door to either stop closing or go back up. We haven't found any obvious loose parts. The opener is a 1/2 hp craftsman. We tightened the chain. Do the door springs need replacing? They are ~10 years old.

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  • The garage door may be out of balance or a spring may be broken. Close the door and use the emergency release handle to disconnect the trolley. Open and close the door manually. A properly balanced door should stay at any point of travel while being supported entirely by it's spring(s). If it does not, disconnect the garage door opener and call a garage door professional. Do not increase force to operate the garage door opener.

Posted on Feb 21, 2009

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