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Re: Eagle hitch and loader valves on same hydraulics?

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Christopher Mikesell

01-30-2013 21:13:12

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The hydraulic system works by circulating oil continuously. When you need to move a cylinder, you direct the flow of oil into a cylinder and it puts a load on the pump. The pump stays loaded until you either shut off the lever or the pressure gets high enough that the fluid flows through a safety relief valve (like when hitting the end of travel on the cylinder).
In the original eagle hitch system, the hydraulic fluid freely flows from the pump through the control valve and back to the pump. When you raise the lift, either partial or the full flow of the pump is directed to the piston which lifs the hitch, depending on how far you push the lever. Full, unrestricted, low-pressure flow is restored when you return the lever to neutral.
Thus, if you leave the two valves open and try to work the loader, then the fluid is free to circulate through the eagle hitch circuit with little back pressure. This means that you will get almost no flow to the loader valve. Try this: open both valves and fully raise the eagle hitch while leaving the eagle hitch lever in the full up position, and simultaneously try to operate the loader. Once the eagle hitch raises all of the way up, the loader should work normally. This just demonstrates how the system works.
Most tractor hrdraulic systems have a hydraulic priority. Using the valve closest to the pump in the hydraulic circuit will render all of the other valves inoperable until that first valve is released. This is the case with the accessory Case control valve that was intended for the VAC. Denending on your control valves, it might be possible to replumb the hydraulic system so that the loader has priority over the eagle hitch or vice/versa, and eliminate the valves.
It is not a problem with pressure, it is just the way that the system works.

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Christopher Mikesell

01-30-2013 21:17:28

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 Re: Eagle hitch and loader valves on same hydraulics? in reply to Christopher Mikesell, 01-30-2013 21:13:12  
In other words, your system is working like it should. Also, we need to know exactly what you have for control valves in order to advise you on how to hook it up.

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