Well that was quick!
I sincerely doubt the motor can be separated from the enclosing lead. I can disconnect the pulley, and remove the lead enclosure with the motor from the cradle (or whatever it's called) it sits in. I'm sure someone could fabricate a frame to center a new motor in that...
I know this is an old thread and I'm hoping someone knows what motor was used in the J1? I'm pretty sure it's a 24vDC. The motor axel in mine was bent during transportation. I don't know how, as the rest of the table is fine.