craftsman garage door opener

carlen-2010June 20, 2010

After replacing worm gear and very worn down drive gear, I carefully reassembled my 13 year old GDO. Initially, the motor worked fine, but the door only went up about five inches. Then, with chain off the sprocket and the trolley in door-down position, I pressed the wall control again and got very short (1 to 2 second) motor activation, and then nothing. The new gears did revolve, but only slightly -- for the very short time the motor ran. I tried repositioning the black cover on the motor shaft and reinstalling the four prong part next to the cover, but this didn't change anything. I'm not too technically adept -- the instructions that came with the replacement gears just about maxed me out -- so any relatively easy to understand help anyone might offer will be greatly appreciated. Thanks very much.

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Hope this helps.

Make sure you put the black cup back on the end of the motor shaft and that it is pressed all the way on. Make sure the RPM sensor is plugged in. If neither of these are the issue, then you probably did not have the motor shaft pushed all the way back when you tightened the coupler after replacing the worm gear. Loosen that coupler up and from the front of the motor (opposite end in which the coupler is on) push the shaft back as far as it will go. Hold it there while you tighten the coupler back up and then try it.

    Bookmark   June 21, 2010 at 4:37PM
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Thanks very much, Don. You had it exactly right -- it was the motor shaft, and tightening the coupler just as you suggested got us up and running again (after undoing some careless handling on my part of the limit adjustment screws). So again, thanks. I really do appreciate your help.

    Bookmark   June 22, 2010 at 3:51PM
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