Sears GDO Not Fully Opening
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??