My sectional, single-car door is tilted so the right end touched the
driveway before the left end, leaving about 5/8" gap at the left end for
bugs and wind-blown debris to enter the garage. The tracks are perfectly
plumb, so the problem seems to be with uneven tension.
Does it make a difference if I try to raise the right end by shortening
the cable (thus putting the spring under greater tension) vs lengthing
the spring by moving its free end further back away from the door?
I can manually stop the door at any height and it will remain there, so
the combined tension on the two springs is right.
Acutally, at the left end it is a bit low. But when I put a level across
any of the door's sections, clearly the door itself it tilted. And with
the door down, the easily visible gap between the left end of the door's
top and the track is much greater than the gap at the bottom.
I finally got it pretty level by increasing the tension on the high side
and reducing it on the low side. I changed cable length on one side and
moved the spring anchor point on the other. I thought I had tried these
things a couple of days ago without success. While not perfect, the door
will stay the way it is now.
Thanks to all for your comments.
Your most likely problem is simply that one or both of the drums slipped on
the torsion shaft. In that case the correct repair is to lower the door,
properly unwind the springs, reset the drums on the shaft, and rewind the
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