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As the post says, the springs aren't unwound. Jackshaft units don't work like the regular ones you are used to.

Had some guys over working on the AC. I believe they were trying to open the garage manually and lifted my garage door to get into the garage (but won't admit it). Not really sure. But I came home to my jackshaft garage door cables in a spaghetti mess at the top of the door and the door...

I have plenty of room to raise the back. Should I go as high as I can?

My drums are directly over top of the track. They wind "normal" not reverse. The advice I saw above to raise the back of the track a bit to slant the door down so as to always keep tension (esp when it first starts to close) seems like pretty good advice.

Thanks. That makes sense, I kind of had a suspicion the problem would be with going down, not up. I called and spoke with Liftmaster. They did not know why I wasn't supposed to do it. Do you think if I backed off the tension on the spring, I would have enough weight to make the door want to...

Thanks. I have the 3900, just thought some people might still be most familiar with the 8500. The LM document says: The 3800/8500 will NOT work on the following types of doors: Low Headroom Dual track doors: Dual track doors are opened by pulling the top of the door back towards the rear...

Ok, so I've seen the youtube video where this was done so it know it is possible. I can hand lift my door from the bottom, so that seems possible too. I have a double track, low headroom, from clopay on a clopay door. I have a normal (not reverse) wind drum. There does not appear to be...