Then how do you know if you have enough fluid in both chambers??.

The reason I ask is I have put it back together, (I also replaced both the small idler pullies and
the belt to be on the safe side)jacked it up und done the air purging, got the wheels to go forward & back
then lowered it and tried it out.

It goes forward ok for a little bit then very slowly, in reverse some times it works then the next time it won't
I done the air purge 3 or 4 times for the same results.
When it does go it makes a howling type sound when under pressure, so that is why I queried the oil bit as I am wondering
if there is enough in each chamber - I put exactly 1.8L of 5w50 syn oil.

Or is it a matter of continuing the air purging.

Rich