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 | dietmar
Join Date: Jul 2003 Posts: 2 Fort Erie, Canada 
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2003-06-14 57603
Help, can someone tell me the right valve to use on a Yanmar 155D tractor with a new FEL. I,m ready to complete the hydraulic hookup, but am now told that this might not work. The valve I would like to use is a double spool type,open center with a single acting spool installed on one side to accomadate the single acting lift cylinders.
Pressure line enters the inlet side of valve, and exits from outlet side and continues back to the 3 point hitch
valve. Will this work or do I need power beyond type valve.
Will the 3 ph work when loader is not being in operation.
Thanks for any help. Dean
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley 
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2003-06-15 57682
I guess that you don't have a valve now and that the loader has double acting bucket cylinders and gravity lift cylinders. I think that some older loaders work that way and valve assemblies for them probably are available but I don't know specifically. The conventional assemblies found today are for double acting cylinders on both bucket and lift and the lift spools. I can't see that they'd work for a one-way cylinder.
If you have identified a valve assembly and the question is about power-beyond I believe the answer is that it should work but there's a risk. A valve that isn't power-beyond rated can be ruined if a control valve is operated at the same time that a loaded 3ph is in lift mode.
The exhaust galley on the loader valve is exposed to high-pressures generated by the 3ph load and can rupture. People do operate such configurations and they're just careful to avoid operating both at the same time. The issue would exist for the bucket circuit and may also exist for the lift circuit.
The thing is that some single return line valve assemblies are power-beyond rated, so a particular valve might be fine for the application. You just have to know the particular valve. I'm thinking that there may be some issues I'm not aware of but it might be easier to buy double-acting lift cylinders and use a conventional loader valve. There a bunch of useful features available for loader valves that may not be available in a valve that is designed for the loader.
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