You will need to release the tension on the torsion shaft, remove the shaft
and spring so you can install the drive unit over the shaft..
Any time your going to release or tighten one of these torsion springs, it
is dangerous.. You need to follow the door installation instructions..
I you didn't install the door yourself, you may want to get assistance from
someone who has..
I haven't installed a Wayne Dalton drive yet, plan to when I can afford
one.. However I just finished installing my own door and torsion spring
system.. It's scary as hell, as you get more and more torsion on the shaft..
I had to release the torsion once (due to a change in the installation) and
that was just as scary..
I would expect that the Wayne Dalton units would have some warnings and
safety instructions included.. Be sure to look for them and proceed with
My opinion and experience. FWIW