Hey John,
It's sorta like pulling apart a front hub but with an axle in it. Pull the cover or axle bolts from the end of the hub. Remove the cover and/or axle (depending on the set-up). There will be a double nut set up with a locking tab in between. Find the bent over tab of the locking ring and straighten it away from the nut. Remove the outer nut, then the lock mechanism and then the inner nut. Now it's free from the axle tube. Sometimes the inner bearing likes to stick so it may need persuation. Try to find a number on the seal before removing it so it can be cross referenced to modern part numbers. Most places (older places) should have it in stock.
Good luck,
Scott
