OK, just got through taking one of those apart last week.
Get ready for a fight.
On the back side,the side that faces the axle nuts, around the hollow shaft is a ring. Its not a snap ring, the best way to describe it is a spiral ring.
It has an end, that you have to work out of the groove, then it winds around the shaft about 3 times.
After you get it off, it all comes apart from spring tension.
Putting it back together was fun. Its not all that hard, but I had about decided I was going to have to go out and use a vise to hold it all together while I got that darn keeper started.
If you don't get it back on easily, go for some kind of clamp or vise. Don't spend about 30 minutes like I did trying to do it with just my hands.
The one I was taking apart was brand new, never installed. I wanted to know how it went together and worked for future reference.
From the factory, it had a small amount of red grease. NOT heavily packed. That hollow shaft had a bronze bushing right under the keeper ring, and I put a small amount of the excess grease on it when I put it back together.