[kennyd]

First I would try to re-engage the rear PTO just to make sure that the hydro pump is not driven off of it, unlikely, but you never know what the previous did.
To test the rear hydraulic's, just try to operate the lever while the tractor is running and see if the engine lugs down (hydraulic system will go in "relif")-if it does then they are working, but my guess is they are not working either.

I am not real familiar with these older machines, but have a good understanding of hydraulics, othes will chime in shortly also I'm sure...