Hydraulic Fluid Replacement

Hey everyone,

So I just purchased a used 3320 with allied loader, going through a complete fluid change.
As for the hydraulic / trans fluid, I've read many cases that 80w-90 should be used and others where TDH is used. It was recommended that I use 80W-90 but my fear is that as I will be using the tractor for plowing in the winter and the hydraulics would run too slow (-25 c).
Also any diagrams as to the location of the drain plugs? I was told that the large plug underneath the rear 3 pt hitch will drain most of the hydraulic oil.

Thanks

80w/90 and 15w/40 UTTO or STOU are quite similar in viscosity, just gear oil is measured at room temperature and the other two at 60 degrees or so.

With a loader you will do a lot of hydraulic work so i'd recommend the UTTO because it will age less when warm, and it has anti foam additives.