Need to pull hood off and drain antifreeze system.  Book says you will need to remove radiators and frame to get fan motor out.  However, you can sneak fan motor out the top if you discount all the hoses and remove all radiator bolts and tip radiator ahead.  You will want two guys for lifting motor since its heavy and awkward position doing it this way.  Getting the big hydraulic line nut loose can be another problem due to space if you don't pull radiator.  We used an air hammer to vibrate nut loose.  It was way faster not pulling everything.  You should also check speed of hydraulic fan motor once you install new at certain temps.  We never had to readjust ours after checking.