3pt hitch on 670 (650?)D

[newbury]

Trying to find out more about the 3pt. It doesn't have a FEL.
It's not my tractor so I don't want to sink a lot of $$ in it.

in

if you have a front end loader the tractor will need hydralic tranny fluid.if you just have the 3 point hitch you can use gear oil.the manual explains it.try links for a manual. Valley Power. Sheaffer's Town & Country Tractor . used compact tractors, front end loaders, backhoe attachments, implements

it's stated "you can use gear oil".
Can I also use hydraulic?
Any pointers to where drain valves, filters etc. are?
thanks