Seal: outer seal to keep junk out
Okay, not a very good description...I believe slash 5 from 1970 and bikes clear up to about 1985 used the same format. In a perfect world where the swingarm was greased/serviced on a regular basis you could just continue the regular service like you described. On bikes that sat around or were not greased on a regualr basis the grease gets hard. When you attempt to insert the grease tool to send in that shot of fresh grease the old stuff does not want to move. So I pul the swingarm seal, 31 41 2 000 331, which destroys it, and then pull the bearing out. The bearing is usually not worn much, clean it and fill it with wheel bearing grease, clean out the housing and re-insert the bearing into it's race. New swingarm seal and you are back in business! Here is a pic of what most of us would see when we started. I have removed the spacer at this point.
Cycleworks tool: swingarm bearing puller 1955-1984
What a range of years the tool works in, wow. Sweet tool that does not damage the swingarm. The brass colored nut in the middle is pushed down and the Allen screws expand to grab hold of either the seal or the bearing race.
another piece of the tool
seal is out, ruined but that's the way of life
The seal is now out, destroyed but no damage to the swingarm or the bearing.