sonny the last time I broke track on the 977 i didnt have a track press so I just burned the master pin out of the track links (inside link and outside) I was going to replace it with a new master pin anyway..if you are careful you can burn the weld away that holds it in place and re-weld it again with the new(er) rails. I did make a track jack with a section of 7/8"acme threaded hard rod and heavy pattern nuts,and some rectangular tubing..sure made connecting up the track rails easy later.
I had three worn track bushings in my replacement used tracks I put on,I just welded them up with ER70-S6 MIG,overlapped it and ground it down again to take the same shape as the other bushings..a lot of time spent with a grinder but it worked out OK..-that was 20yrs ago..man how time flies and crawlers don't..work safe,best of luck..lookin at your photos I'dve steam jenny'ed that little Case before wrenchin on it,but thats just me..I'll bet it was thick in there
