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

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The chain came off my Craftsman 53920 garage door opener. How can I fix this problem?

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  • lilbigredhea Sep 11, 2010

    Is the operator newer than 1983?

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When a chain comes off it is an indication of another problem. The bearing on the sprocket shaft is bad and lets the sprocket lean forward and the chain pops off. The part number you need is 41C4220A Gear and Sprocket Assembly. The chain can be loosened by the nuts on the trolley.

Posted on Sep 13, 2010

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You can fix this by loosening the chain enough that you can lift it off the sprocket. Then run the opener until the sprocket turns counterclockwise and stops. Now with the door in the open position replace the chain. This will get the chain running the right direction. You will have to adjust the open and close limits along with the force adjustments but that will all be covered in your owners manual.

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