Need Hydraulic Help

I have a '68 2000 that has only the stock self contained internal hydraulics. I have a 711 one arm loader that has only upward pressure that needs to be plumbed. I have purchased an adapter plate and have some questions about how is the best way to hook it up. The plate has both a standard pressure port and a power beyond port and a single return port. What I would love to be able to do is put a open center valve on the standard port with connections that will be used for single action cylinder on the loader and double action cylinders on various other pieces of equipment with the loader disconnected. I also would like to put connectors on the power beyond port that can be used with my woodsplitter which has it's own controls.

Does anyone have a resource, reference or suggestions for a rookie at hydraulics. Am I dreaming about what I can do with the plate or am I missing a simple thing that will add flexibility for little extra cost.

All help is appreciated.

Yes it has the following Return Port, Pressure Port and Power Beyond port. I guess that would illustrate my obvious ignorance if the PB port is in instead of out. I have tried to research what Power Beyond really is but all I can find is that most tractors now have it. That is one of the reasons I asked if anyone has a reference manual or information source. I do this kind of stuff to learn as well as to have a better tool.

The adapter plate is made by Tisco and is model #HV5902 Adapter Plate Kit. The kit comes with good instructions about how to install the basic plate between the standard housing and the standard accessory plate. I am not going to have a problem with that but I am afraid that Tisco assumed that I knew what I was doing with the plumbing. The instructions have a caution statement that says "Do not start the engine until a complete hydraulic circuit is installedbetween port P (pressure) and port PB (power beyond). Plug in port P will cause the hydraulic system to overheat and cause damage to the hydraulic system" It also refers to another warning which says "If for any reason the remote control valve is removed from the circuit DO NOT simply plug the "P" and "PB" ports of the HV5902 adapter plate. Either remove the HV5902 from the tractor completely or install a hose loop connecting the "P" and "PB" ports."

All it says about the plumbing other than the warnings is "This adapter plate kit is designed for open center type hydraulic valves, with power beyond capability. Use of directional valve with out power beyond capability is not recommendedand should not be used. Closed center type hydraulic valves will cause damage to the hydraulic system."

If you intend to use the tractor hydraulics and this plate for your power source, I have it figured out now. The "P" port is for pressure in to your loader control valve. A word about the loader control valve that you choose. It HAS TO BE open center WITH power beyond capability. This type of valve will also have 3 ports (in addition to the work ports): pressure, return, and power beyond. The PB port is a source of pressure oil tapped downstream of the loader valve circuit used to power the 3 point, via the adapter plate. Also, the loader valve does not need to have its own relief valve, as the tractor has its own relief. The exception would be if you don't want the loader to operate at 2500 PSI (the tractor relief setting).

Think of the system as a series circuit. The oil goes from the pump straight to the adapter plate. From there it flows out of the "P" port and on to the inlet of your loader valve (this is why the "P" port can never be plugged, the system will then be constantly going over high pressure relief). If the loader is not in use, then pump oil flows out of the loader valve PB port and onto the PB port of the adapter plate. This oil then goes to the 3 point hitch circuit. Without this plumbing in place, the 3 point would not work, as it is the last function to receive oil.

The return port on your loader valve only flows oil when you are actually moving the loader (return oil from the cylinders). This oil goes to the return port on your adapter plate and then straight to sump. This oil cannot be used to power the three point because the loader valve return oil gallery cannot stand the potential high pressure being generated by 3 point use.

So then, at the risk of confusing you even more, I'll tell you how to plumb this thing: one hose from the "P" port of the adapter plate to the inlet of the loader valve. One hose from the PB port of the loader valve to the PB port of the adapter plate. One hose from the outlet (or return) port of the loader valve to the return port of the adpater plate. The first two hoses need to be rated for 2500 PSI minimum. The return hose can be lower.

On your log splitter, you again have two choices: 1) plumb the two power hoses for the splitter control valve directly into the loader valve lift or dump circuit, using quick couplers. Doing this, you would have to hold the loader valve lever back while the log splitter is in use. You would also have to be careful not to reverse the flow. You could reduce the potential for problems here by running the return for the splitter straight to sump, rather than through the loader valve. 2) you could tap the pressure line for the splitter valve directly into the PB hose coming off the loader valve, again using quick couplers. The return would again have to be routed straight to sump.

Both of the above options would be fine as long as you don't expect the 3 point to work while you are using the splitter (I'm not sure if the splitter is mounted on the 3 point or not). If you went with option #1, you could return the loader valve spool to neutral momentarily to make the 3 point active again (remember, the loader valve has priority to the oil over the 3 point). Another option would be to replace your log splitter valve with one similar as the loader valve, then route the oil as follows: pump>loader valve>splitter valve>3 point. This is not likely to be a viable option due to the added expense.

Hope all this helps and that I didn't confuse you even more.

Thanks again and do you ar anyone else have recommendation for a valve!!!!