The British and Belgian tractors do have some extra baffles in the area around the pinion shaft but I think those were more related to the hand brake than the hydraulics.
I was into one of those on a 4000 but can't remember exactly now.
The filter on those should be the same as a US built one.
You can take them out and wash in solvent then blow them out good and get more service out of them.
You do have to pull the lift cover to get at it though.
As to the hand brake, my 4000 had that on it. It was completely shot and the oil seal was allowing a lot of water to get into the rear end. It is a nice feature but the parts to fix it were very expensive when I looked maybe 6? years ago.
I simply removed the entire unit and covered the hole with a round plate from an American 3000. Was simple to remove it.
If I were you I would pull the handbrake off and start the tractor. Put a good load in the 3 point and lift it. Then look inside that hole. If the lift piston seals are bad you will see a lot of leakage from above.
Lift piston is easy to install if needed.
Thus site sells the kit - new lift piston, seals and cover gasket. Cheap - $15-$20?
Service the filter while you have the cover off.
No silicone. Silicone - especially around hydraulics, is for morons.
Welcome to the Ford board.
Those are very good tractors.