I assume these are two piece axles, are there bolts on the hubs? If so, un-do them a few turns, they will be really tight. Use two hydraulic bottle jacks, one on each side of the axle hub, pump them up and strick the bolt head with a hammer till it cracks free.
You open the chain case, remove the bolts on the end of the sprockets. With them removed, keep pumping one of the jacks on the hub to pull the axle out. With them out, i use a long metal bar to slide inside the axle tube and knock the cups out of the axle tubes. You will need to pull them off the axles too, i have installed them with a pin punch before, but a piece of water pipe large enough to go over the axle will work to knock them back on.