Craftsman garage door opener 1/2 hp

fzrgerardApril 24, 2009

I have a Craftsman model 139.53627SRT that has worked great till now.The chain jumped off of the sprocket. I reinstalled the chain and adjusted to leave a little slack and it jumped off again. The door moves freely when unlatched. Any help would be appreciated.

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This is generally caused by a bad bearing letting the sprocket lean forward and the chain jumps off. You can get the part at Sears or any opener service company. It is called a Gear and Sprocket assembly and the part number is 41C4220A. It should also come with instructions.

    Bookmark   April 24, 2009 at 4:34PM
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Thanks a lot don 1. I will give that a try.

    Bookmark   April 24, 2009 at 8:48PM
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Changed the sprocket assy and the door works great!!

Thanks again don 1.

    Bookmark   April 26, 2009 at 11:43PM
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