why does my garage door only open halfway
Garage door springs support most of the weight of the door when it's opening and closing. A broken spring typically will make the door very hard to lift, rather than causing the door to stick halfway. But some spring problems can contribute to a stuck door.
The springs help turn metal wheels, called pulleys, that help lift the door via vertical cables at each side of the door. A pulley can become jammed by an obstruction or possibly a misaligned or hung-up cable.
Any problems with springs or pulley should be examined by a garage door professional. Springs (and pulleys) are highly tensioned and can be very dangerous to work with.
First, unhook from the opener and try to lift the door.
If you can't lift it by hand then something is in a bind or a spring is broke. Try running the opener without lifting the door. Does it open all the way? Openers need adjusting from time to time. Weather affects them too.
It may just need a little more upforce. Next I'd look for a pulley or belt slipping. Let us know what you find. Oh, and you should be able to lift the door and it stay near or at whatever level you lift it to. It shouldn't slam down (or up)
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