Sears Opener Keeps Opening

yardbagSeptember 2, 2006

My Sears Craftsman 1/2HP Opener is an old Model (#139.664002) without electric eyes. It recently refused to stay in the closed position - dutifully opening when triggered either by pushing both wall buttons or by using the remote. It closes until impacting the floor then switches direction operating until fully raised.

I've read a good many summer posts & responses, not quite seeing a similar explanation. Springs look good, traveler is not obstructed, visible wiring appears in good condition, rollers are greased. Ideas on trouble-shooting this symptom?

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brickeyee

Sounds like it is bouncng off the floor.
Try adjusting the down force.

    Bookmark   September 3, 2006 at 8:26AM
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Don_

Your door is closing too far. On the side of the motor unit you will find two controls. One is the 'up limit' and the other is the 'down limit'. With a small screwdriver turn the 'down limit' in the opposite direction of the arrow printed on the cover until the door stops at the garage floor but does not reverse to the open position.

    Bookmark   September 5, 2006 at 12:09PM
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yardbag

Brickeye & Don -
Kudos to each of you. The up & down limits were actually on the bottom of the unit, but hidden by the light cover. After a few foolish attempts at playing with the up & down force screws (on the side), I realized where they were. The limit screw location has probably changed over the years. I'm in business, at least for now. And, the unopened replacement unit is on its way back to Sears.

Oh, I tried the tech # you mentioned in an earlier thread, Don. But because I had a pre-electric eye version, they wouldn't even talk to me. "I'm not UL-certified". I suppose eventually, I will be. Thanks for keeping me questioning.

    Bookmark   September 9, 2006 at 3:01PM
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