Motor runs but will not pull chain!

anthony11385February 5, 2010

i have a craftsman 139.5396o srt garage door opener and when you press the button the motor runs and turns the interrupter through the rpm sensor but nothing happens after that the area of the limit switch does not turn to pull the chain would it be the sensor or......???

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Your drive gear is stripped. It is a white nylon gear in the area of the interrupter. You will probably have what looks like white sawdust all over the cover when you remove it. The part number is 41A2817 and is available at any good local door opener service company.

    Bookmark   February 6, 2010 at 3:42PM
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Hey home owners. Hire a Pro. We make it sound easy because we've done it a hundred times and we have all the right tools. There are a lot a variables that cause the gears to wear out. If you hire a pro they can fix the opener and make sure everything else is working properly so you get the longest life out of your new gear. Homeowners are always having problems with the openers after they try to fix them because the main gear drive may just be a symtom of a problem and not the main problem. A lot of times a mom and pop type door guy is your best bet because they deal with service more, not just new construction so they see these problems every day. Know you limits when it comes to DIY.

    Bookmark   March 9, 2010 at 2:08PM
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