Jim L -
I've been thinking about your "Hydro Valves spraying Hytran out the top",,,,,
Now that I've opened the 1250 valves up it's more clear "to me anyway" that the only possible scenario that could cause such a thing would be:
#1 Hydro Pressure Greater than Steve's mention of 625psi,,, per service manual,,,,
The 1,000psi pressure gauge is quick easy check,,,
My 149 was spot on except for the deadhead max pressure reading,,,
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Idle was at 100psi
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WOT 200psi
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And then this is where fell off a bit,,, WOT Hydro lift deadhead pressure 450psi, just below the Service Manual 500-625psi
The pressure check will atLeast let you know where you stand pressure wise,,,
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And if pressures check out ok then:
#2 would have to be what Earl F mentioned about defective "New" or "Rebuilt" valves,,,,
o-ring on plunger just below top of valve,,,,
I've been looking at rebuild kits for these valves and
Many don't include the small internall plunger o-ring,,,,
Good Luck,,,, Hope you get it sorted out,,, can't wait 2 see pics of that Awesome Loader in Action!!!!