I was wondering about that, but it doesn't seem to be an isssue. The cycling speed and strength of lift seem the same in the JD format vs the Cat which it was in (all though the opperators - Dad and I were pretty shaky).
I will drop by the Komatsu dealer later in the week and ask - the worst case would be to trace the pilot lines and switch them.
We will run it for a few days anyway and see how it is. We are digging out slabs 3'X3' of a cranberry field and replanting them in the holes and dammaged area of another field. We are digging them out with our PC-60 and using the PC-25 to scrape a bit of soil over them and pack the slabs down in the good field. If we need something bigger, we have our EX 120 sitting on the dyke to push out piles of sawdust and soil.
I'll update with the progress later in the week.