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Sears/Craftsman Garage Door Opener

Posted by fred2006 (My Page) on
Wed, Jul 26, 06 at 21:19

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 ????

Follow-Up Postings:

RE: Sears/Craftsman Garage Door Opener

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.

RE: Sears/Craftsman Garage Door Opener

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.

RE: Sears/Craftsman Garage Door Opener

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.

RE: Sears/Craftsman Garage Door Opener

All the wires are connected and the contacts are clean.

RE: Sears/Craftsman Garage Door Opener

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

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