MF 20 steering gear lube

[boatmoter]

Hi all, have a MF 20 industrial loader. I need to find out what type of lube the steering gear box takes. it is power steering,power steering works fine, want to service the steering gear box,it's empty,I know some tractor use grease, some use 80 - 90 wt gear oil,it's not in my shop manual,users manual or my parts manual