Those can be a real bear to get out.
(assuming you"ve moved the large snap ring out of its groove and off to the inner side of the axle)
I had to make a bracket that has a threaded rod that pushes against the center of the axle....much like a gear puller.
It bolts to the inner casting where there are 2 tapped holes (not sure of the original intent)
After tightening the screw, I still had to beat it severly with a 2# hammer to get the axle to come loose.
If you"d like, I can get a pic of it to show what it is.