How to remove top window sash

Looking for help since YouTube isn't returning a good result.

I need to remove the top window sash for glass replacement on a double hung window. There are no tilt latches. I am able to push up the bottom sash ~ 6 inches and pull the bottom sash out no problem.

I'm not sure how to remove the top sash though. Do I need to consider the balance and possibly damaging that? It looks like I have a channel balance system in the window based on a Google search. I can provide any additional information or pictures if needed.

http://imgur.com/a/o21OfnI