I have a Sears garage door opener (1/2 hp, Model 139.53606). Recently, the sprocket quit turning the chain but the motor ran when I activated the opener. After opening the case I discovered the White PVC drive & worm gears had stripped and had worn down after years of service.

I ordered replacement parts from Liftmaster, disassembled the mechanism, replaced the parts and reassembled just as the direction stated. Before I reconnected the chain to the sprocket, the instructions advised the following:

Run the opener until the sprocket has completed a clockwise cycle.

I tried running the opener until it ran a full clockwise cycle, but the opener refuses to do that. The opener will rotate clockwise for approximately one second, then it stops and reverses for the same period of time. Even with the chain drive on the opener, it still does the same thing.

Another problem that has cropped up is the lights on each side of the opener do not light up.

How do I fix the problem?

Thanks

 

teddford

At this point the best thing would be to call a professional. You have done most of the expensive labor part and I'm sure he could get it going with out much more labor to the opener. The safety lights may just need to be lined up with each other.
But the real problem is the door needs to be adjusted. Normally when the gears go out of the opener it is sign the door is not adjusted right.

Roger

 

Roger,

The door adjustment is not the problem. The door is equally balanced.

The problem has nothing to do with the weight of the door...for I don't even have the chain on the sprocket. The "safety eyes" are properly aligned as well. According to the operation manual, the green lights would be on in the event everything is lined up properly. There is nothing in the door track which would cause the motor to reverse like it is doing. However, the moter cycles as though the infrared sensor is obstructed or misaligned. As the manual suggests, I even disconnected the sensor and tried it. Had the opener worked then, then it would have meant that I needed to re-align the sensors at the bottom of the door on both sides.

One clue I haven't yet figured out is that there is a green light on one side of the opener that continually flashes in a series of 5 pulses, pauses, resumes, pauses, etc.

Anyone else have a clue?

 

teddford,

I am not the pro at this but it may be possible that one or 2 things might be happening.

I believe the flashing wall LED indicated that you have selected lock out or the vacation switch which disables any wireless operation. Look for small dip switch on the side of the wall switch or a button with a lock icon on it.

It sounds like your garage door opener's receiver might be at fault. Take your controllers to the nearest Sears store and ask them to test it with there in-store display units. I'm sure they won't mind. If they function OK there. You probably need a new receiver board in your garage door opener. Then call Sears parts and service number.

You can email technical.support@chamberlain.com or call toll-free S.O.S. Hot Line® at 1-800-528-5880 for more information. Customer service team is on call SEVEN days a week.

Let us know how its going!

 

Thanks Doug!