Sears/Craftsman Garage Door Opener

fred2006July 26, 2006

I have just replaced the chain drive gear and sprocket assembly (plastic gears were stripped)as per the instructions with the carriage and limits in the down position. When I plugged the unit in the motor want's to drive in the down rotation, I tried changing the limit switch to the up position but the motor only wants to rotate in the down rotation. I believe this may have been the problem that caused the gears to strip. Any ideas?? circuit board or ????

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Don_

Loosen and remove the chain from the sprocket. Run the opener until the sprocket turns in the clockwise direction and stops. Replace and tighten the chain and try it. You will probably have to adjust the up and down limits a bit. Let me know.

    Bookmark   July 27, 2006 at 5:47PM
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fred2006

I did that but it drives in the down position and takes the limit switch to the end of it's travel so that it falls off it's threaded rod.

    Bookmark   July 27, 2006 at 9:58PM
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Don_

Are you sure all the wires are connected on the limit switch assembly. There are three wires. The brown wire goes to the down contact. The grey wire goes to the center limit contact and the yellow wire goes to the up contact. You might also try cleaning those contacts where they touch each other.

    Bookmark   July 28, 2006 at 5:41PM
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fred2006

All the wires are connected and the contacts are clean.

    Bookmark   July 28, 2006 at 9:43PM
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fred2006

Found the problem, removed the printed circuit board and took the covers off the relays, the down relay had stuck contacts. FIXED IT ,

    Bookmark   August 1, 2006 at 8:11PM
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