A MF 231 holds about 9 gallons of hydraulic oil and is added via a plug in top of the transmission housing.
in the oil filler hole
The same oil as you put in the engine!
where do u put hydraulic fluid in a Massey Ferguson 275
Beside the gear shift levers
On the left side of the gear shifters
put the stick on the right in the middle and turn the key
Hydraulic fill is on top of the transmission but be sure to remove both drain plugs at the trans and back end as they are connected before refilling.
The same place as a massey165
There is a spout on the rear close to under the seat. See picture
To the left of the gear shift lever, large plug on top of transmission. Fill here,
Right side of engine right past the cab if it has one.