for a ten wich in fact the same principle as a 22 (the 15 is same as ten and after the 15 came 20 and after that your 22 and i only talk about the final drive now!)
a tappered bearing under the nut on the inside is now holding it from dismanteling, so with some force you can press it out of there or put the nut back on but not tight and slam with the hammer, maybe some heat on the bearing carefull not to much!
in simple words :you have to take of one side of the bearing of of the axle to take it all out.
its easyer if the sprocket is of , btw
with a good puller you can pull of the clutch if the nut is of , again some heat or hammering on the puller , carefull it can come of with alot of force , dont stand in the line of it!!!!!, always besides !!!!
goodluck!
marco