Massey Hyd. Pressure

[SAI]

We have a Massey 85 tractor that won't keep hydrualic pressure on the PTO clutch. The clutch pressure and steering run off a small Cessna, (seperate from the hydrauliuc system). I get 4gpm and 25 psi @ 750 rpm. At 2100 rpm 4gpm and 225 psi. The PRV dumps @600 psi. Our shop man. does not give us pressures only the 4 gpm. Does any body have any psi experience on this one?

 

[J_J]

What is the model number of that pump.

 

[SAI]

That pump has a couple of #s. One is 909, below that is 15602 00.
My brother piked up a repop some where that has 90261/0 & 50494 below that on it.
I've got to think the first #s are better. probably ser# & mod. #?