The track press is a hydraulic piston/ram system used to press the track pins in/out. It creates a SERIOUS amount of pressure in a small area. As I recall these things create on the order of 150 or 200 tons of pressure.
I've got a 20 ton bottle jack that can pick up the whole back of my 450. I use it when I need to jack up a side to reset the track.
Suppossedly you can use a sledge hammer and a big punch to drive the pins, but mine are so rusty I doubt it would work. The master pin is suppossed to be easier to drive, but to save me I can't locate it on my machine. The master pin has a machined ring or something to distinguish it from the others.
Fortunately my tracks are so worn and streched that I can use a come-along to pull back the idler and then use a couple of pry-bars, chains etc to put the track back in place. Then again having worn tracks means that they come off easier too.
1968 Case 450