I f.....d up a little, quick question

I drive a New Holland tractor, T6 175, and after a small hydraulic leak I had top top up the hydro reservoir. This tractor has a combined rear axel/hydraulic reservoir containing 16-17 gallons of mobilfluif 426. This is where I fracked up and filled a gallon or two of diesel (never gonna NOT label a barrel again). Before I noticed this I have used the tractor for some hours. What is the correct course forward to undo this? I've found that some diesel in hydraulic fluid is ok, but I dont think this is the case with axle/gear system? Any advice?

I f.....d up a little, quick question