front loader washer - Lg Tromm

Hi there:
We bought the new bearings and seal to the Lg Tromm model # wm2277hw. My husband has been trying to remove the inner metal tub from the outer tub to remove the bearing and seal. How do we remove actually do this. We have the hammer and punch but the shaft does not come out. Please help.
Thank you
Dawn
dawnsa12@Gmail.com