Tom,

The oil pump is covered in the manual from 2-98 through 2-100. I don't have the manual in front of me (I've got some of it scanned, but not that particular part) but it should cover how to work on it. I was thinking that it had its own relief valve, but according to the parts book, it doesn't. Later tractors do. Could be it has worn vanes, a weak spring between the vanes, or someone could have put the vanes in facing the wrong direction. These would all cause low oil pressure. 

On the front seal, do not put sealant on the cork seal or the face that it rides against. Put you can put some where the tin part of the seal meets the crankshaft. Could be that oil is pushing through that area. I've never had trouble with one there, but a poor fit would let that happen. I'm trying to remember if we have discussed the condition of the front seal. Could be it is defective somehow. More brainstorming...