Help replacing Peachtree 81-112

Sure, I'd be happy to help! The first thing you need to do before anything else is remove the sliding door. Sometimes you can lift the door up and swing in to the house, other times you need to remove the screen door and stationary glass door and swing the door outside. Either way, once it's out you want to lay it on two saw horses, or any stable flat surface. Unscrew the two bottom frame screws and use a hammer and a block of wood to carefully knock off the bottom rail.

So that's the rail out. Now you can slide out the old wheel assembly and slide in the new 81-112. Reinstall the bottom rail by lightly tapping it back in place to the door and reinstall the door frame screws. Set the door in the track and adjust the wheels for the door to make sure it squares up and operates smoothly.

I would try silicone spray on the vinyl ribbed glazing spline to see if it would make the frame slide more easily on the glass.