Always a good idea to change the crank seals.
If you don't have them, Mark H may have some or,
New replacements
FW side, MAC pn 61618 crosses to National 471551 or SKF CR5756, single lip 0.562 in Shaft, 1.379 in
PTO side Mac pn 110260 crosses to SKF CR6119 double lip or SKF CR6120 single...