Don't forget your good friends heat and lube.
Get some penetrating oil and give it time to seep down where it needs to go. Use heat to expand and constrict various parts. Even a jug of boiling water over the back of the engine cases can help them expand enough to break free of the axle.
In the past I have used a bolt; not threaded into, but sat into the hollow of the axle, to give a good flat perch to hammer against. If you chew up the head of the bolt just exchange it and keep going. A nice big hammer and as others have said lay the frame against some timber so that your force isn't being absorbed by the frame flexing away.
Stay patient and work at it over a couple of days cycling between heat, lube and a good few hits. Typically once it starts moving it all happens reasonably quickly.
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