Pictures of all damaged parts would help too!The housing would have to come off to release the inner end of the axle. Is the axle housing cracked? Oil leaking out? Is the wheel bent?
This is your answer!What kind of tractor.BX series ??? If it's a BX series in order to pull the axle out you'll have to take the rear wheel off and remove the axle seal. Behind the axle seal is a internal snap ring remove it and the axle will slide out.