I have I believe a 1989 case 580 super e. Boom model number is 35c. I am rebuilding the dipper cylinder. I need a diagram of how the seals and other parts go on it because when I took it apart, some of the seals and o rings were completely destroyed. The rebuild kit I got seems to have some extra parts in it. There is a whitish flat ring that I'm not sure if I need.
That is a backup ring or a buffer seal
You can do the on-line, casece.com and go to parts, type in 580se and go to the hyd section, should show the breakdown.
Do I have to install it because I can seem to get it to fit anywhere.
If you don't see it in this drawing, then no, you don't use it. It is not unusual to not use all the parts in a seal kit.