Diverter to 3rd function

[J_J]

A FEL valve can have many ports.

Some older loader valves had 6 ports.

Newer loader valves have 7 useful ports.

IN port
OUT port/return port
4 work ports
1 PB port.

Some valves do not use the PB port and it is plugged and all fluid goes through the OUT port.

PB stands for power beyond.

This newer type FEL valve may use the PB port to pass fluid downstream to the next valve. In order to do this , the fluid in the valve is separated, and the pump flow is routed through the PB adapter. All cyl fluid goes through the OUT port.

This same valve can also be converted to closed center by plugging the PB port so it can be used by tractors with closed center hyd systems.

Some FEL valves have spare ports for connection convenience. Unused port are plugged.

 

[topbuilder]

What does your FEL valve look like? Can you replace the 2 spool valve with a three spool valve?

 

[J_J]

Why would he want to replace his FEL valve for a three spool valve.

He already has a diverter valve, a 3rd function valve, and the knowhow to install same.

 

[topbuilder]

That puts all three levers where he needs them. No need for power beyond/open center/closed center discussion.

 

[J_J]

I believe this is the valve you are talking about.

3 SPOOL 25 GPM JOYSTICK LOADER VALVE W/GRAPPLE

It might be a good choice if you had no FEL valve.

However it is a 25 GPM valve, and you should match the valve to the pump flow.

 

[kennyd]

What does your FEL valve look like? Can you replace the 2 spool valve with a three spool valve?

The valve body is shown in all the pictures, it's mounted below the operators station and cable operated.

 

[jcummins]

Other issues came up, but trying to get back to this project this afternoon.

I opened up what we think is the PB outlet, and the black nut just above it. Pictures below of both. The hose adapter is nothing more than a jic to oring hydraulic connector. The nut has a recessed hole in it that a small pin with a flared washer type bottom slides into with a spring between them....something pressure related?...but not sure it's related to the PB, unless it handles the requirement for a PB adapter.

I do not see anything that looks like the PB adapter you spoke of J_J.

The hose I took off, traces back to the rectangle box I spoke of. From there one routes to the casting immediately below the rear remote valves, the other goes back into the tractor at the very top of the body.

It would appear the line I took off, feeds the rear remotes....or the rear remotes feed the FEL valve. From J_J's post, it feeds the rear remotes. This means, that the PB adapter...has to be there somewhere, or the rear remotes wouldn't work?



sorry for the blurred pic.

 

[J_J]

The other PB adapter looks this.

 

[J_J]

Looking at your tractor hyd, I see the pump feeds a bracket with two fittings which are coupled together with a U shaped tube. If you have a FEl valve, the coupling tube will not be there. Feed tube is item #10, and comes directly from the pump..

With no FEL, I believe this loop feeds back to the side of the tractor, and maybe the remotes, which I can not confirm.

It stands to reason that to add a FEL valve, the pressure line is used to feed the FEL, and the PB from the valve comes back to that bracket with the two fittings, and then goes back to the side of the tractor.

The feed line from the pump is item #50.

The PDF is to large to post, so if you go to Kubota Parts | Full Service online retailer.

Enter your tractor data, and select hydraulic, and they will send you the PDF in minutes.

Can you verify the other ports on the valve?

The IN port usually has the relief valve close by.

The OUT port will connect back to tank, and you may see some tees in that line.

Then you have the four work ports.

Only port left should be the PB and it should have something in it to separate the galleries so the PB fluid will pass downstream,and the cyl fluid only goes through the OUT/return port.

Can you take a better picture of those parts that came from that port.

One PB adapter is a sleeve type fitting as in the first picture.

The other PB adapter is only a single 1/4 in plug and fits down inside of the port. Are there threads on the inside bottom lip.

 

[jcummins]

The loop is not there, instead the line 050 connects to the line I removed on the green marked port on the FEL valve, that we was thinking was the PB port. The other line at the loop goes to the line behind the 4 work ports. You can see that line in the first picture in this thread. The 7th line, is shown in the 2nd picture on this thread, that come in near the top of the valve, and next to it, does appear it could be a relieve valve, and from your description this is the IN port. It is a larger metal line and goes back only a short ways then into the side near the top of the tractor.

So in my way of thinking, we have id the IN port, and the 4 work ports, we have the bottom line on the fel connecting to line 050, and the other line connecting to 010. 7 ports on the fel valve is all there is, right?....BUT I don't see anything that looks like the PB adapter from the line I took off.

 

[Sysop]

sorry for the blurred pic.

I think it is the part between the 90 and what appears to be a spring. It sure looks to me like what J.J. posted.

This is what a PB adapter looks like.

 

[jcummins]

That item has a solid head, unlike what J_J posted.

The three items on the right go together and screw into the opening above where the hydrualic hose was attached....which we were thinking is the PB port. It's design is pressure related...to probably control fluid internal to the fel valve based upon pressure.

Given where those two hoses from the fel route to, should tell someone the correct story, but I don't know enough ....yet....to say. I wish I knew of a M7040 with 3rd function so I could look at how it's plumbed in.

 

[Sysop]

Didn't think it would be that simple... Best of luck!

 

[J_J]

It could be that whoever did the FEL job left out the PB adapter.

If you did not have PB, The pump fluid would try and take the route of least resistance, and that would be the OUT port. .

So if the remotes and 3pt work, then you have PB somewhere.

Did you determine the manufacturer of the valve?

Are you sure tr parts yu removed are not the load check.

Is there a similar port on the other side of the valve.

Most all hyd valves have load checks, usually between the work ports or close by.

A load check has a poppet, and a spring.

 

[jcummins]

It could be that whoever did the FEL job left out the PB adapter.

If you did not have PB, The pump fluid would try and take the route of least resistance, and that would be the OUT port. .

So if the remotes and 3pt work, then you have PB somewhere.

So the hose I took off, that routes to hose 050, is my PB port? If so I should simply route hoses from that port to my 3rd function valve, and back to the hose so it can continue on it's route to that hose number 050? Sounbd right?

 

[J_J]

J_J thanks....

I understand this....
Once the PB is established, run a hose from the PB adapter to the IN port of the 3rd function valve.
The OUT of the 3rd function valve then connect to the 90 degree hose you remove from the PB port.

And it was the way I was thinking all the time. I was not aware of the PB adapter though. It seems if a tractor has a PB port....the adapter should be built in, if PB is not functional without it. And, I was not aware the rear remotes runs off PB. Thought the rears had it's own setup. If a tractor with existing remotes has a fel added, the pressure line must require rerouting to the fel first.

Also, not sure I understand the plug above the hose with the elbow though. What is it's purpose?

I'll open some things up tomorrow.

The PB option makes that valve a convertible valve.

Originally, you tractor did not have a PB port, and the pump fed the remotes and 3pt with pressure.

So any valves installed in series should have a PB port.

The valve with just a plug in the PB port is just an open center hyd valve and will work fine if it is the last valve in the series flow.

Same valve with a PB adapter allows the valve to pass the pump flow downstream and can withstand pressure.

Same valve with PB adapter and a plug in the PB adapter makes that valve a closed center valve.

Some valves do not have the PB option, but the PB port with adapter is necessary for other valve downstream.

The main reason for the PB port is that the OUT port is usually a low pressure port about 300 to 500 psi.

The PB port can take full pressure.

If you use that port for high pressure upward of 2500 psi, you could damage the spools

 

[J_J]

So the hose I took off, that routes to hose 050, is my PB port? If so I should simply route hoses from that port to my 3rd function valve, and back to the hose so it can continue on it's route to that hose number 050? Sounbd right?

You need the valve manual to verify that a PB adapter is available.

If you had a 5 valves in an open center hyd series circuit, the first four valves should have PB adapter installed and connected to the next valve and so and so.

Last valve does not need PB as the flow is going to tank.

 

[jcummins]

You need the valve manual to verify that a PB adapter is available.

If you had a 5 valves in an open center hyd series circuit, the first four valves should have PB adapter installed and connected to the next valve and so and so.

Last valve does not need PB as the flow is going to tank.

Have we determine that the rear remotes are driven through the fel valve? If so, the PB has to be there.
And any new 3rd function valve then has to have the PB adapter too....since the flow from 3rd function would be to the rear remotes.

Your comment....If you use that port for high pressure upward of 2500 psi, you could damage the spools....makes me think you don't believe this port is PB.

 

[J_J]

That statement was for the fact that the OUT port is only designed for about 300 to 500 psi, and if all pump flow was to pass through that port, it could damage the seals.

I am still not sure you have PB as I have not seen the PB adapters.

You haven't answered my questions about a manual for the loader, or that you have seen a PB adapter.

Who is the manufacturer of the valve?

Is there a threaded hole inside the green port?

If your remotes and 3pt work normally, then we must assume that there is an adapter somewhere.

If there is no PB adapter, the FEL valve would work fine, but pump flow and cyl flow would take the path of least resistance and go though the OUT port.

On some of the Prince valves, the PB screw in under a plugged port, and the port used for PB out will not show this. Prince LVS, and LVT valves are like this.

 

[jcummins]

That statement was for the fact that the OUT port is only designed for about 300 to 500 psi, and if all pump flow was to pass through that port, it could damage the seals.

I am still not sure you have PB as I have not seen the PB adapters.

You haven't answered my questions about a manual for the loader, or that you have seen a PB adapter.

Who is the manufacturer of the valve?

Is there a threaded hole inside the green port?

If your remotes and 3pt work normally, then we must assume that there is an adapter somewhere.

If there is no PB adapter, the FEL valve would work fine, but pump flow and cyl flow would take the path of least resistance and go though the OUT port.

On some of the Prince valves, the PB screw in under a plugged port, and the port used for PB out will not show this. Prince LVS, and LVT valves are like this.

Have no manual on loader, nor seen PB adapter.

Mfg of valve, no idea, I see nothing on valve to clue me in.

No threaded port inside green hole.



Give how the fel valve is plumbed in, th PB port should be identifiable by where those hoses go. I've identified all that, but not knowledgeable enough to still id the PB port.