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I have a craftsman garage door opener and the chain came off the track. I've put the chain back on the track wheel but i had to loosen the chain to do so. now, when the door closes the bar bows up and the door opens again. how do i adjust the door?

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  • Thomas F. Schneider May 11, 2010

    Your problem is listed under washing machine.




    I believe that thetr is an ajustment at the end of the chain?

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The reason your door is opening again is because there is a limit switch that is not making contact at the appropriate time to tell the drive to stop closing the door. The chain drive motor is controlled by a circuit that is expecting to see a signal telling it that the door is closed. If it doesn't see this signal to stop at the appropriate time, it continues to drive the door down unless it sees a certain amount of back pressure, which then tells it to return the door to the up/open position. This is a built in safety feature for most garage door drives and is industry standard now due to children getting caught under them and being killed. You can try this yourself. Stick a 4 foot 2x4 vertically under the middle bottom of the door as it's coming down, after a second or two the door will reverse direction.

With the chain falling off the drive and loosening it to replace it, you may have inadvertantly positioned the actuator of the switch, which is usually attached to the chain, out of position by a couple of links. There is a momentary contact switch mounted close to the door on the support shaft of the drive mechanism. This support shaft is the one holding the motor drive on one end, along with the chain and is anchored to the header over the garage door. This momentary switch may have a short metalic or plastic arm hanging down that is moved by the actuator on the chain and needs to be reset to a position where the switch contact will be closed when the door is in it's closed position. There are other options also depending on how new/old your door drive is. Some of the newer models use a through beam sensor or photo eye as a stop switch.

Please let me know if this helps.

Backyard_Jim

Posted on Dec 31, 2008

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