Oil filter on JD B

Joe, removing the oil pump won't gain you anything. The filter body & filter head are in a different place than the pump.
~Your best bet is to pull the crankcase cover, drain the oil & stick a light way down in the crankcase. Then you will have to figure out if you will be able to work under the crankshaft & rods to access that filter head. ~All the oil lines will have to be removed from the filter head. Then # 7 will have to pulled down & out the bottom [an old 5 gal pail handle with the wire handle re-bent a little will usually work by inserting it in the side holes in #7 then swatting down on the wire handle with a hammer or piece of pipe], then bolts #5 will have to be removed.
~It is awfully hard to work under that crankshaft & rods & pulling the governor will help to see down in there. I find it much easier to work if the R/H rod is pulled loose from the crank & the piston/rod pushed forward.
~It�s a dirty job & will leave your hands & arms cut up but CAN BE DONE without pulling the governor. ~Using short cut down wrenches helps & being about 16 years old & ambidextrous is also a big asset.
~Go slow, ask questions & remove what you have to so you can see & work in that crankcase.

You folks were so right when you said this would be a dirty, nasty job. It probably would help if one was 16 and ambidextrous--this I know -being 80 and having short arms is not to my advantage. Still think that working on an old JD is great sport. Thanks and God Bless