Sorry to hear about the tornado and the havoc it must have left in its path!
I have had a 300 U for about 25 years, and have some of the answers you may be looking for. The PS oil is supplied by the one and only tractor hydraulic pump located near the right front of the engine. The pump is just ahead of the distributor. The hydraulic pump draws its oil from the big square resevoir beneath the operator's seat. It should have a dipstick attached to what looks like a pipe plug just under the front edge of the seat. You fill hydraulic oil into that same plug hole. You should be using the Case IH hytran fluid. Your PS gearbox has a small pipe plug for filling with gear lube...90 wgt. It needs both the gear lube and the pressurized hydraulic fluid supplied by the hydraulic pump. If your lift hitch goes up with lifting power, then your hyd pump is OK. I suspect the problem is in the PS priority valve, but other members of this board do understand the diagnostics of this better than I do.
Your tranny and rear end are partially filled with hy-tran oil. IIRC, there are 2 drain plugs, one small brass plug at the front bottom edge of the tranny housing, and the other a big pipe plug at the very bottom center of the rear end between the wheels. If your oil is milky color, then it has water in it and should be changed out. I think the tranny and rear end takes about 7 gallons of new oil. It is poured in a large pipe plug opening very close to the tranny shift stick. There is a small pipe plug near the left footboard that should be removed first so you can tell when you have poured in enough oil. Do not overfill, as it will come out the rear axle/wheel seals, and maybe the bottom clutch opening.
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