Tilt the window sash toward you and lift it out of the frame. Set it down in a safe place.
Remove the cap from the screws on the jamb liner, the liner on either sides of the window frame. Loosen the screws in the liner and pull the jamb off of the Pella window.
Locate the weight cord inside the frame. Pull the cord off the pulley mechanism and unhook the loop at the end of the cord from the Pella window. Pull the weight cord out.