Backhoe hydraulics via power beyond valve

Rustytractorguy · Aug 27, 2015

The equipment in question is a 1979 Ford 545. I am adding a Bradco 11HD backhoe. I'll also be adding a loader valve with power beyond.

Here is my question, do I need to connect the backhoe remotes when the backhoe is not attached to prevent hydraulic pump damage? Or will the loader valve return prevent pressure from building with nowhere to go? Please refer to attached cheesy diagrams to help, feel free to laugh. FYI, the empty text bubble is suppose to point out a "T" fitting for the backhoe return.

I'll attach a link to the loader valve instruction manual.

Rustytractorguy · Aug 27, 2015

Here is a link to the manual for the power beyond loader valve I have. I appreciate everyone's help BIG TIME!
Power Beyond Loader valve manual

Sean in PA · Aug 27, 2015

You should connect the power beyond port to a return line to the sump when the backhoe is not connected.

That control valve that you provided the link to is similar to the one that I have. It is normally just a regular open center valve and you can add a conversion plug to convert it to power beyond. When it has the power beyond conversion plug installed, the power beyond port gets all of the flow when the valves are centered. The other "return" port only receives flow when the valves are not centered, from the non-powered side of the cylinder(s) that is/are receiving power to the other side of the cylinder.

gears · Aug 27, 2015

Sean, you don't have a schematic for a PB setup going to an open center valve do you? I keep failing to wrap my head around the power beyond flow pattern.

Rustytractorguy · Aug 28, 2015

Can the return from the power beyond to sump be permanently installed? If so, does there need to be a valve of any sort? Perhaps I'm thinking like electricity, but wouldn't the fluid divert through the easiest path when the backhoe is under load? Thanks for the info.

The attached diagram would apply whether or not the backhoe is attached.

RodinNS · Aug 28, 2015

It would depend on exactly what PB valve you have... I suspect Sean is correct in that if you have the PB port in use then it is the sole path of return flow once it's installed. Now if you remove the PB port and simply plug it... then no... the sump return on the valve would be sufficient. You'd just have to carefully read through the schematics and instructions for the particular valve you have.

Rod

Sean in PA · Aug 28, 2015

Can the return from the power beyond to sump be permanently installed?

No, the power beyond port from the loader valve is what powers the backhoe. If you installed a return line permanently where you have it in your drawing the fluid would follow the path of least resistance back to the sump and the backhoe would never get power. I guess you could put a ball valve there but you will have a return line from the backhoe to the sump when the backhoe is installed anyway, and you will want quick disconnects to make removing and installing the backhoe simpler and easier, so just put opposite gender quick disconnects on the lines going to and from the backhoe, and when you disconnect the backhoe just connect those two lines together.

Sean in PA · Aug 28, 2015

(quoted from post at 22:22:16 08/27/15) Sean, you don't have a schematic for a PB setup going to an open center valve do you? I keep failing to wrap my head around the power beyond flow pattern.

Gears - if you go to the link that Rusty provided for that Prince valve and look at the picture with the descriptions of the flow on the second page, it is basically the same except that the plug at the top of the drawing is replaced with a longer hollow plug that goes down far enough to seat against the center port coming up from the valves below it, so the "open center" return flow goes out through the power beyond port. The top channel that goes left-to-right in the picture to provide flow to the original "return" port is wide enough in the fore-to-aft orientation when looking at the picture that the fluid coming back from the non-powered side of the cylinders will go around the power beyond plug and make its way back to the original "return" port.

So when the valves are centered and not providing any power to the loader cylinders, the only flow out is through the power beyond port, and when you have one or both of the valves moved from center to power a cylinder, the fluid that gets pushed out of the back side (non-powered) of the cylinder flows out of the original return port.

Rustytractorguy · Aug 28, 2015

Ok, that's what I was thinking and attempted to depict with by original picture (the second picture) The yellow "U" from grey box (quick disconnect) to grey box (quick disconnect).

I appreciate your help, Sean and Rod.

Backhoe hydraulics via power beyond valve

Rustytractorguy

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gears

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Sean in PA

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