how much hydraulic fluid?

[plum dum]

i have an older massey (i think around 1965) that needs new hydraulic fluid. how much does it hold?

 

[Ken1945]

Does your 135 have the strainer in the bottom of the transmission and is the hydraulics and transmission use the same fluid?

The reason for my question... I have a 253, which is a 3 cyl diesel turbo charged, the tranny and hydraulics are combined. I just changed it and it took about 12 gallons. Hope this helps you. Ken