I have a Ford 3000 that I have a hydraulic pressure problem with. I am completely stumped at this point. I pressure checked at the pump, before it was rebuilt. I could get 500 psi. Rebuilt the pump, thoroughly. Pressure checked it again after rebuild at the same spot, and now I have less pressure than I had before. Circulated the hydraulic fluid through a valve with a hose, no signs of air. The back lift arms go all the way up slowly. Flow control valve is turned in, all the way. When I turn the valve off at the pump pressure gauge, I still get no pressure. When I turn the valve on to let the fluid run through the half inch hose into the hydraulic fill area, there is a constant flow, but not much pressure. What I don’t understand, is the flow from the suction filter runs directly to the pump. When I isolate at the pump with the valve engaged why don’t I get any pressure reading? Yes, the gauge is brand new I am testing with, it’s a good liquid filled gauge. I took the lift cover off, and checked the suction and discharge filters to see if there was sludge in the bottom of the reservoir. Everything appears to be clear. Should I take the pump back off? Blow through the suction line, now that the reservoir is empty? I’m missing something. I’ve worked on these Ford tractors for 30 years, I guess that hasn’t been long enough, because this one is schooling me. I thought maybe the relief valve was dumping, but I am not sure. I appreciate the help. If it wasn’t in the barn I would have considered setting it on fire tonight. 
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