I think Gapples is the man for this.
I have found that my tractors with the 1920 rpm ptos have faster hydraulics than those with 2140 or 2220 rpm ptos, I guess because their pumps are running faster, with the exception of the 4230 which is a bit faster than the others.
I would imagine you would start by putting some clocks on a spool and see what you get in terms of flow and pressure.
The power steering should have full pressure at tickover though.
I have found that my tractors with the 1920 rpm ptos have faster hydraulics than those with 2140 or 2220 rpm ptos, I guess because their pumps are running faster, with the exception of the 4230 which is a bit faster than the others.
I would imagine you would start by putting some clocks on a spool and see what you get in terms of flow and pressure.
The power steering should have full pressure at tickover though.