Kubota Power Beyond Kit

[rbargeron]

.......
1. Do I need some kind of flow splitter? It seems if both valves are open center, neither would work because flow would be going through them simultaneously unless both (not likely) are in use.......

Bingo ! By your own reasoning process you have happened onto the reason for and the real definition of Power Beyond.
There have been many discussions on TBN - here is a typical one that may help clear things up.
An open-center 4-way valve's inlet port is connected internally to the exhaust port - the oil just flows through it until it's redirected to one of the work ports. To use the high pressure oil for an additional valve, a sleeve is installed in the inlet section of the first valve to block the connection to it's exhaust port. This "power-beyond-sleeve" is just a small part that changes the valve from open center to closed center. For an open-center hydraulic system to still work right, some other valve downstream has to be open-centered to the tank.
The confusion comes when marketers start packaging whole kits of parts as "PB" kits. There is no uniform definition of what is and is not included - because to make it all work right depends on the tractor and the other attachments it may have. Another source of confusion is that for many years JD hydraulics were closed center systems anyway (the variable pump flow was zero when all valves were centered). On closed center systems every valve had power-beyond and there was no need to give it a name.
There are so many differing ideas of what PB is, it takes some reading to understand what it really means to your tractor and your situation.

 

[Spaceman]

Thanks rbargeron, you really cleared up a lot for me in a couple of paragraphs. What do you think of the idea of a filter on the return line for the QD's?

 

[rbargeron]

.......What do you think of the idea of a filter on the return line for the QD's?

I don't think it's needed. It is good to keep the connectors clean, use the rubber plugs, wipe off before connecting, etc. all good practice - but there is nothing inherently contaminating about attachments, they generally have clean oil in them (except maybe rentals). Anyway the tractor's big hydraulic filter and magnet is on the suction side of the pump so anything that gets into the reservoir should get caught in the filter before it goes into the system. My 2 cents.

 

[Yankee Clipper]

Spaceman,

Kennyd is right on - even for a Deere guy, he is correct on how the Kubota power beyond works. They all work the same, for that matter.

If you have a loader, find the PB line and use it to feed you new open center valve for whatever you are doing. If no loader, cut in to the line from the gear pump to the top cover in series ahead of the top cover. Return the flow from the new valve to the top cover so the system relief will protect the entire circuit to discharge port of the pump.

This is easy and should also be fairly inexpensive - just be sure the new valve is open center and can handle 3000 PSI .

Good luck!

 

[radioman]

I assume you mean Surplus Center

yup - the one and same.

 

[DEEPNHOCK]

OK..
I used to be smart, but have forgotten much...
I need some sage advice...

I have a Kubota B7200HST that is a sweet machine.
Want to add a pair of QD's out back to run a log splitter.
The log splitter has an open center valve on it.
My unit has nothing. Plane Jane.
So......
If I add the p/n#70070-00385 diverter block, that will get the pressure side tapped into.
But I would need to add a second valve (with a power beyond port) to supply the QD out back.
What would be a good valve to do that. Don't want to clutter everything up more than necessary.
A simple on/off, or push pull valve would suffice. Nothing fancy.
The tractor valve would be an open center with power beyond, right?
The flow would go right through it to the 3pt in the off position, right?
Shopping for parts using the vendors here... Want to keep it simple.
Thanks ahead of time.
Jeff