does not sound right to me. that steam is a red flag to me, leak or stopped up radiator!!!!!!
drain the coolant out of the radiator. (be sure to keep it out of the way of your animals, they love the taste of that old green antifreeze)
hold your hand over the bottom radiator hose opening, fill the radiator with water.
now release your hand and see how fast the water runs out of the radiator.
if it gushes out, you are good to go, but if it dribbles out, runs out slow, then your radiator may need cleaning out.
also, I would assume you have washed the fins out on the radiator from motor side to front of radiator and insured the front of the radiator is not covered in leaves and dead grass.
fan belt is tight and turning the water pump at the proper speed.
may not be able to do this on your ford, but my radiator repairman told me to run my radiator cap loose, he said these old tractors have plenty of cooling capacity and do not need the pressure.
do you have the right pressure radiator cap on the tractor, I do not know your cap pressure but you should know and insure its right. the one on my tractor is 6 or 8 lbs, but again I keep it loose,
have been bush hogging heavy stuff lately with no coolant problems.
good luck and do not let the tractor motor get hot.
losing oil pressure is the fastest way to ruin a good engine.
letting the engine get too hot is the second fastest way to ruin a good engine.