Engine originally specified single wt oil based upon temperature. I have a good tight engine so use 10w-30. If engine is loose use 10W-40. The transmission hydraulic and pto are the same cavity and same oil, most people uae hydrolic/transmission oil it is about 20 wt. There are 3 plugs to drain this cavity.
Final drives can not drained without taking off the pan. Use 140 wt gear oil. The two stearing gear boxes usually leak oil so a lot of peoplre remove the plugs and put grease fittings there and use Gen purpose grease.
I have all the manuals so if I can help just e-mail me.