Sears GDO Not Fully Opening

cciaffoneFebruary 16, 2009

It's an older (10 years?) chain drive model.

Very often, the door stops about 10-12 inches from

the bolt. But often is opens to within 4 inches

of the bolt where it belongs. No consistency!

But when the door does not fully open, I can then

trip the catch on the trolley and the door fully

opens by the springs, which tells me it's not

the tracks binding the door.

So, an intermittent, not-fully-opening Sears

chain drive garage door with no binding.

What causes that??


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On the rear of the motor unit near where all those white wires go you will find the 'up force' control. Increase this a bit and see if it doesn't help.

    Bookmark   February 16, 2009 at 5:54PM
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Oh, way back I have tried to increase both the
up travel and the up force. Still inconsistent.
Currently up force set almost to max, up travel
set so "WHEN IT WORKS" it goes up to 4" before
the bolt. Again ... sometimes it works great;
other times it stops 10-12 inches before the bolt.

    Bookmark   February 16, 2009 at 7:44PM
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Try disconnecting the door and checking the balance. It should stay 3 to 4 feet above the floor with your hands off. I would also remove the cover and take a look at the limit switch operation and the condition of the drive gear.

    Bookmark   February 17, 2009 at 9:31AM
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Thanks Don. At 2-3 feet off the ground, the
disconnected door holds steady just fine.

I will check out the internals in the next few
days. What should I be looking for??


    Bookmark   February 18, 2009 at 12:17PM
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If you watch the limit switch assembly you will see how it works and can see if that is part of the problem. The gear will be obvious if the teeth are starting to wear.

    Bookmark   February 18, 2009 at 4:31PM
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Cover is now off.

All gears look great. Sharp and well lubed.

The upper-limit contact WAS stopping the upward
movement prematurely so I rotated the screw a bit
and the door opens all the way now.

I could understand this, but ... while the upper-limit
was off, stopping the upward movement early,
why then did the door open all the way sometimes???

    Bookmark   February 19, 2009 at 1:23PM
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only you who can physically see the mechanism can properly answer that question. Anything else is pure speculation.

Glad it's working for you.

    Bookmark   February 19, 2009 at 4:59PM
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Then ... after working fine for a while ... last
night it slammed up against the bolt and then would
not go down. Jammed again. Everything inside looks
like it's working OK, then oliversudden it either
goes up too far, or not nearly enough.

Maybe time for a new operator.

    Bookmark   February 22, 2009 at 7:27AM
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