560 Priority Block?

My new 560 has the two steel hydraulic lines that run to the lift in the back.

Those lines have been cut and capped off near the shifter. Rubber hose has been run from the right side ports from another control to the back to the lift cylinder instead.

That works, but I'd like to get things back closer to original, if I can, and run the lift off the proper lever.

My question: What IS the priority block for (if I'm calling it the right thing - going off of what I've seen online - it's the block at the end of the steel lines that mounts under the seat)? What does it do?

I don't have much experience with hydraulics, so forgive me if it's obvious.

One steel line is broken off right at that block. I'm wondering if I can have a machinist friend kind of bore it out and tap it for a threaded fitting to make this repair. Then I could run some new steel line straight to the existing stubs that are left up front (plenty of of material left to work with on that end).

OR should I just run rubber lines off what's left of the steel lines directly to the cylinder, and not worry about the priority block at all? (since that seems to be how it's running now anyways off the other controller).

I know these lines are famous for rotting out under the seat area, and I'm guessing that's what happened to mine, and that's why the were cut and plugged.

Thanks

I am parting out a 560 diesel; the steel lines & block appear complete.
My E-mail is open if you are interested.

The block bolted to the side of the block that is part of the lines, is a check valve to hold the load up. Some have two hoses coming out , those being double action check valves and some have just one hose coming out of the check valve and the other hose comes out of block built onto end of pipes, making that a single way check valve. Double check valve holds loads on cyl both ways, single only holds load one way.

ah ha - thank you - mine has the two ports in the one block. But I've seen the others where the ports are offset - one being in each block.

Interesting.

I still don't quite get how the double action check valve works, but I kind of understand what it does - I'll research that more on my own.

Thank you for explaining.

I'm assuming (hoping) since I have the double, if I were to happen to buy a set of lines that has the single action port on it - that I could still use those lines on my double action block if I seal off the unused port on the line block.

I think I might have a set of those steel lines with blocks for a 560 somewhere if interested. Email is open

This should explain how a double acting check valve assembly works.