sash replacement kit contains everything needed
gently pry old side stop off
remove pulleys and weights from frame cavity
Remove the Old Window Sash Pieces
The new kit should include jamb tracks, a pair of sashes, mounting clips, a parting stop and complete set of directions (Image 1). The steps shown in this project were for the particular sash-replacement kit shown. Individual steps may vary somewhat for different models, so read any instructions that included with the window kit you select.
Once you've received your kit and are ready to remove the old sash, begin with the window stops. Using a utility knife, score the side-stop all the way down the length of the window from top to bottom. Gently pry the old side stop off using the pry bar (Image 2). The stops can be reused or replaced with new ones -- if you intend to reuse the old ones, take care in removing them so they don't get damaged.
Then, remove the sash-parting stop. Since this area will later be covered by the new insert, you can break these pieces out with a pry bar (Image 3). After removing all of the old sash-parting stops, remove the upper sash by sliding it down and lifting it out (Image 4). If your window has a pulley system, you'll need to cut the pulley rope before removing the sash.
Finally, remove the the pulleys and weights from the window-frame cavity (Image 5).