Those track presses are nice on bigger machines. On D-6 and smaller the sledge hammer and pin work just fine as it takes a little time to rig the press up. I have maxed out the 150 ton cylinder pressing a 245B track apart and had to help it with heat and a sledge. Fun Fun!
Here's a picture from ACMOC of one tool. Cutting into each end is by far the easiest way, especially if it doesn't move after several tries and the master pin starts to swell. Using two torches, one on each link, is better also. Phil