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Well when you start getting air out the other end, you know the system now has fresh fluid in it:)

Well if you take one off and fluid comes out of the port instead of the line when you operate the pump, you got the wrong one:)

I described a way. you need a pressure container with a valve though. I have used old gas cylinders and fire extinguishers for this to pre-lube engines and cycle cylinders. you can also use plain compressed air. 120 PSI X3.14 SQ/IN piston surface area = 360 pounds of force on the piston...

Is there fluid in the hand pump reservoir? There is a filler plug on the top left/front corner...

There are filters in the valve body, I believe at different locations depending on which valve model you have. There are flow limit check valves in the cab tilt and tire crane cylinders that are there to prevent a cab or tire falling in the event of a hose failure. There are restricted...