d 19 -190 hi low

Hydraulic version will old much more HP and it even has it's limits.

Ok another question on a 190 valve at 400 psi how much flow do you need and does the 3rd line return from the valve back to the base or direct it some where else thanks

The hydraulic pump delivers between 5 and 6 GPM to the steering orbitrol motor connected to the steering wheel. When the steering circuit is done with the 5 to 6 GPM delivered to it,  the same 5 to 6 GPM of hyd oil is sent downstream to the Power Director valve and the back pressure to the orbitrol motor is modulated to between 250 and 350 psi. Whenever you are in LOW or HIGH range, this 250 to 350 psi oil is directed to either the front tube or rear tube to apply that selected clutch. If it takes 2 GPM to apply the selected clutch, then the remaining 3 to 4 GPM goes thru the center tube for lubrication of the intermediate gears, bearings and the Power Director clutch discs themselves, and then of course has been returned to the sump. The gallons of "lube circuit" oil is dependent upon how much leakage each clutch pack has and how many GPM's were delivered from the pump to begin with. The priority is that each clutch is delivered enough volume of pressurized oil to lock up the clutch so it won't slip under load. So, I guess the answer is, you need 5 GPM minimum because that's what the specs are.  I don't quite understand what you're trying to do, but I will advise you that the PD clutch has it's HP/torque limits and there is only so much you can do to it to hold increased HP.....300 HP isn't a problem....500 HP starts to be, depending on tires and weight class, etc.

Thanks mack i have elimanated all hydrolic and am installing a small pump for just the power director wasnt figuring but about 3000 rpms for this season gona get the bugs out then build a new motor and then the power director will have to go but think i might need it with the small motor again thanks