There are some differences between the 4 and 6 cylinder tractors. The 4's run at a lower pressure... 160-180 is where they peak out, but as far as I know the supply side is the same. Pressure regulation is done in the PTO control valve. Lube oil to the DP clutches IS different though. The 4's get their lube oil off the cooler return so the tractor is not dependant on being run in DP low for stationary PTO work like the 6's were. Otherwise, as far as I know, they're quite similar. I've never opened either one yet. I've been lucky enough to catch the pressure problems I've had early.... and haven't destroyed the DP... yet.
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