Adding an extra valve to my Jinma FEL

[Rick in WA]

This is mostly the original tractor piping, with the FEL installed first in line off the pump.
Rick

 

[Harry in Ky]

What does that prove? It's your loader valve that that's in question.

 

[lman]

I put one of these on my tractor. It works for me. It sounds like your hydraulics may not be up to running 3 functions at one time anyway.

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[Rick in WA]

What does that prove? It's your loader valve that that's in question.

I am just showing how my system is built right now so others know what I am working with. I figured it might make a difference to others if they knew how all of it tied in.
Rick

 

[etpm]

An open center valve means that when the valve is in the neutral position the hydraulic fluid goes through the valve and returns to the reservoir. When the valve is actuated this return is closed off and the fluid goes to the device plumbed to the port the valve directs. If the device is a cylinder then fluid will flow to the cylinder as long as the valve is open to that cylinder. When the valve is returned to the neutral position the flow to and from the cylinder is blocked and this means the cylinder will not leak down, it will hold its position. And once again the fluid will flow through the valve to the return port to the reservoir. When the power beyond port is used if a valve downstream from the first valve is opened the return to reservoir port in the first valve closes and pressurized fluid goes to the downstream valve. If the downstream valve is teed into the return to reservoir hose the downstream valve will share fluid with some going to the reservoir and some going to the downstream valve. This means lower pressure and slower motion. The proper way to install a valve downstream, in other words in series, of another valve is to use the power beyond port on the first valve in the series.
Eric

 

[ericm979]

Losing your steering when you operate the loader must be a pain. I'd look into putting the loader valve in series between the splitter and the 3pt. The new valve for the grapple would go in between the splitter and 3pt as well.

The grapple valve either needs a PB port if it does not have a tank port that can handle full system pressure (usually 2200-2400 psi). Many valve's tank ports can only handle 500 psi or so.

Many valves send all excess flow to the tank port when a spool is moved off neutral, even when they have PB. So the order of the valves would be important.

The common electrically activated 3rd function valves used for grapples do not have a PB but do have a tank port that can handle full pressure. So they can have valves downstream from them. But I think when activated they flow everything into the work ports. So any downstream valve would not get flow at that time.

 

[Harry in Ky]

Rick, do your own research on power beyond as it applies to series plumbed open center valves. Don't believe everything you read here. Misinformation is worse than no information at all.

 

[LouNY]

My preference in your situation would be to replace your existing valve with a new loader valve with a power beyond port.
Then install a diverter in the bucket curl circuit to operate the grapple.
As mentioned if installed after your steering splitter you would always have power steering, the loader would operate just a bit slower.
Also a 3 section valve would provide you a spare hydraulic circuit.
I would want float in the loader lift circuit.

 

[etpm]

Rick, do your own research on power beyond as it applies to series plumbed open center valves. Don't believe everything you read here. Misinformation is worse than no information at all.

Harry is correct. What I posted may indeed be wrong, though I don't think so. Checking other's work as well as your own is important.
Eric

 

[Harry in Ky]

My preference in your situation would be to replace your existing valve with a new loader valve with a power beyond port.
Then install a diverter in the bucket curl circuit to operate the grapple.
As mentioned if installed after your steering splitter you would always have power steering, the loader would operate just a bit slower.
Also a 3 section valve would provide you a spare hydraulic circuit.
I would want float in the loader lift circuit.

While I agree with some of that, placing the valve after the steering flow divider will reduce a rather small flow to begin with, to an even smaller flow. Judgement call there. He would need to evaluate for himself just which option would suit his needs more. I'm guessing the loader is already pretty slow.

The diverter valve might be a simpler option than adding more spools, but adding wires to the mix can nearly as confusing as hydraulics to some people. I wouldn't jump off into replacing the current valve without first confirming that it couldn't be made to work