Support the axle with heavy wood blocks, and give a couple really good whacks with the biggest hammer you have. If it starts moving, keep at it till you get close to the end. Keep measuring the pin before driving it out so you don't force the swelled out parts through the hole. You may have to grind down the pin or cut it off before continuing. Spray lube is you friend here along with heat. Switch your propane bottle to a bottle of MAP gas, it will get much hotter. The axle should almost be cherry red.
I have had to drive pins out of school bus axle with sledge hammers taking full overhead swings, it's not a fun job!
Joe
