(quoted from post at 06:58:26 03/10/17) I asked you previously:
Was it working before you changed the lines? If it was then I doubt it is the pump
You never answered my question, all you said was "what else could it be?" We can't help you if you don't provide us with the answers to our questions...
With that being said your response also said that it sat for almost a year with the pistons off. By that I take it that you mean the cylinders were disconnected. The pistons are inside the cylinders. If the cylinders were disconnected for a long time then anything could have gotten into the lines and could be clogging things up.
We are not mind readers, could you please tell us step-by-step what you did when you tried to get things working after it sat for that long. Did you connect the cylinders back up and try to run it before anything else? If so then whatever crud got into the lines while they were disconnected probably got circulated through the system and is clogging up something, possibly inside the pump and possibly in the control valve, or at any point where there is a connection for a line or any other place in the circuit where the passageway gets narrower.
Another question that you never answered was this one from Destroked 450:
What do you mean by drop piston port?
Are you talking about one of the cylinders or back at the remote outlets.
If you don't use the proper terminology then we don't know what you're referring to, so we ask questions like this to try to figure out what you are referring to, and once we determine what it is we will tell you the proper name for whatever it is so that we can communicate on the same page going forward. If there is something connected to the hydraulics on your tractor that you are calling a "drop port" and we don't know what it is, then we are working blind and will probably not be able to help you. If you don't know what it is and can't describe it well enough for us to determine what it is, post a picture of it and we can usually figure it out.
We are here to help, but we need proper information from you sf we are going to be able to provide that help.
Maybe the best place to start would be for you to go back to the very beginning and tell us why the cylinders were disconnected in the first place before it sat for almost a year and then tell us what was done when you tried to get things working again.