One of my garage doors has moved off center. It has an electric operator,
that has always worked flawlessly, but recently, because the door is off center,
the door hits one of the tracks, then pops, and then centers itself and goes up.
Going down is no problem--it doesn't hit the track going down. All of the
rollers are free--both the wheels and the shafts--everything slides properly.
Over the last 2 years, I have replaced the springs, as they broke one by one.
They are extension springs--not torsion springs. With the operator disconnected,
the door operates fine by hand, but still hits one of the tracks. The door is
light and moves easily by hand.
What actually centers the door between the tracks ???
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