Were there any 550's built without power steering?

I do not think the one I just bought has it...cannot see any lines or anything.  The problem is that is steers like it has power steering that is not working...REALLY Heavy.

I have ordered the I&amp;T manual for the tractor...waiting for it to come in. 

Does the steering box need to be filled with gear oil or??  If so, can anyone describe where to put it in?  I figure that is the main problem with the steering could be that the box is dry, but I can't figure out where to check or add.  (doesn't help that I am 6'3&quot; with large hands!  lol)

Thanks All!