are you talking about the seal underneath or the seal where the shaft to the steering wheel is?
my old 800 had the lower one where the steering plate is attached leaked all the time. THe local CASEih dealer couldn't get them. may John can?
swapped in a new box from a late model 930/1030 wide front. steers with 1 finger even sitting still.
curious if John has those seals and parts.