Im a little late on this, but the 801 under my ranch king was already oil filled. idk if they did some of these oil, some grease. somebody could have added some to it, but from the gunk that was in it, it didnt look like it had ever been changed. i threw 90weight gear oil in it and it seems to be doing fine. no leaks, at least the last time i checked it.
And honestly dude, we should have checked the levels in that simplicity a long time ago. the way it sang something had to be wrong, but neither of our lazy a$$es ever checked it, which should be the first thing you do. just like checking the oil in an engine. then you end up with the problems you ran into