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Garages/Workshops

Repaired Sears garage opener still not working

19 years ago

When my 1/3hp Sears chain drive opener stopped working I realized a metal bushing was gone and replaced it. Now the motor and shafts spin free again. I also replaced the plastic gears which were in the kit. However, now the door will only go up six inches and then immediately go back down six inches. The limit controls seem to be set fine and the door is not binding. I am wondering if the circuit board could be messed up as we had lightning the day it stopped working. However the other garage door opener in the garage works fine. I have unplugged the unit for an hour and the manual gives me no other ideas.

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Comments (4)

Don_
19 years ago
Disconnect the door from the opener and lift it manually. In fact ask your wife to lift it. I think you have repaired the results of a door problem. I know you said the door isn't binding but I am concerned with the weight of the door. It really isn't normal for the door to stop after a few inches on the way up and then reverse. This is a symptom of a very heavy door.
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quest88
Original Author
19 years ago
thanks Don for the followup. I thought about the heavy
door issue to, but the opener acts this same when even when
I disconnect the chain from the door, so I am sure it is the opener. It has been working well for about 20 years.
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This is a problem with the logic board. Being of that vintage, you will probably find a small grey or yellow learn button on the rear of the motor unit. It's possible that you will have the dip switches, but I doubt it. 91 was about the time they got away from switches. Whatever color of learn button you have, go to your local garage door service company and see if they have any used boards with the same color of button. Most door companys, including us, keep old boards for just this kind of circumstance. Don't pay anymore than ten bucks for it. Unplug the motor unit, take the four screws off the back plate and unplug the logic board by lifting straight up on the white plastic plug. Plug in the new board and re secure to the motor unit. You will need to re program your remotes. It's worth ten bucks to try to fix your problem, but with a unit that old, don't be spending any more.
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sooner4ever
18 years ago
I also replaced the gears in my opener and its doing the exact same thing. It goes up about a foot the goes back down. I know the door isn't too heavy because it worked for 5 years. I also disconnected the door and the bracket only travels about a foot then goes back. Anyone know what else I should try?
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Don_
18 years ago
Loosen the chain so you can remove it from the small sprocket on top of the motor housing. Run the unit until that sprocket turns counter clockwise and then stops. With the door in the open position replace and tighten the chain. You will probably have to make minor adjustments on the up and down limits on the side of the unit but this should get everything in sync again.
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