help with eaton 2 spool

vtmbz · Feb 9, 2012

I replaced my old 2 spool valve with a new eaton 31922. It works fine but squeals when not in operation. This is a KB 7100 tractor . To operate the loader you pull a lever under the seat back. WHen I do that, I hear a squeal. In lift or curl, no squeal. Eaton says this is an open center valve, so what have I missed? Thanks

J_J · Feb 9, 2012

Your hyd system is open center, which valve did you replace? The FEL valve.

J_J · Feb 9, 2012

Please explain further. What valve under the seat?

vtmbz · Feb 9, 2012

There is a switch valve under the seat that directs the hydraulic to the 3pt hitch in one position and to the fel valve mounted on the fender in the other position.

In addition to this valve, there is a lever with three positions:
With switch valve directed to the 3pt hitch, you pull the lever full back to lift, center to hold, and forward to drop. To operate the fel, the lever is in the full back position.

Now: after install a new spool valve (eaton 31922), when the lever is in the full back position and the flow is to the FEL, with the FEL at rest, there is a squeal. Operating the lift or curl eliminates the squeal, but at rest the only way to eliminate the squeal is to disengage the lever; in other words I dont seem to be getting flow through my new valve. Since the lift and curl work, I am stumped.

oldnslo · Feb 9, 2012

First question is, which ports are plumbed to what? If you getting a squeal something changed, first place to start looking is what you did last. I.e. changing the valve caused the squeal, where the ports in different locations? Is this valve setup for open center? Does this valve have power beyond?

I am going to try and attach a spec sheet for reference. This was taken from Eaton website.

Reading through the literature this shipped as "Closed Center" valve. The power beyond is an option.

vtmbz · Feb 9, 2012

Thanks for the spec sheet: I got that myself before purchasing the valve. It does say that this is an open center valve, with an optional plug to make closed center, if I am reading it correctly.

I must have the work ports more or less right because the FEL works.

But I am doing something wrong, because I dont get any flow back. The supply and return are marked IN and OUT, and I have them so that the out line dumps into the reservoir, in this case thats the gearbox.

With the old valve, I could open the fill plug cap on the hydraulic and see fluid running, and now I dont.

I installed the PBY plug myself-- if this were the wrong plug would that be the problem? :confused2:

J_J · Feb 9, 2012

With your tractor running, the fluid is gong somewhere. I you installed the wrong PB plug, the fluid is just flowing to tank via the 3pt. is there any fluid coming out the PB hose?

Show us a picture of the outlet end of the valve .

I have the B-9200, and the switch allows me to run a remote valve at the back, and use the 3pt. The fluid path is pump, to hyd block, to remote, back to hyd block, to 3pt, to tank

What is the PB hose connected to.

The squeal is probably the relief dumping fluid.

Your hose connections might be wrong.

vtmbz · Feb 9, 2012

I dont know is this is how to upload a photo, but if so, this is my valve as it is installed. The port facing the tire is marked BYD I have a plug in it. It hose marked OUT is visible; the other end of it is by the gearshift lever and goes to the site of the fill plug.

J_J · Feb 9, 2012

If you have a plug in the PB port, that is an open center plug, so all the flow is going out the OUT or return port.

A PB plug separates the end chamber so the cyl fluid only goes to the tank port, and the pump fluid pass through the FEL valve for downstream operations, like a remote or the 3pt.

J_J · Feb 9, 2012

This is the way I think your path should be.

Your pump flow is going to the hyd block, so the out of the hyd block should go to the FEL, and after you install the correct PB adapter, run a hose from the PB port to the valve block. The fluid from the valve block will then go to the 3pt, and then to tank.

The return /OUT of the FEL should go to tank.

You probably need to set the FEL relief to about 50 to 100 below the pump max pressure.

This is a sleeve type PB adapter. The other PB adapter is a hex screw.

If that is an PB adapter in the end of the valve, and you put a plug in it, then you made the valve a closed center valve. If so remove that plug and connect a hose from the PB adapter to the valve block.

That would also block the fluid and cause the relief to dump/squeal, and build up heat if it stays that way. And yes, when you use the FEL, the used fluid is going to the out port, and the squealing stops while you are using the FEL.

Use air to check out the flow through all the valves.

What you have said and done is all logical, but not necessarily right.

Leejohn · Feb 9, 2012

Take PB fitting out and the plug you put in move it to the valve body where you took the PB fitting out. You are not using PB.

vtmbz · Feb 9, 2012

I noticed in the circular that the preset relief of the eaton valve is 2000 psi, while the tractor wants 1700 psi. Would this have any bearing on my issue?

If I understand what your previous post said you are recommending that I plumb things so that both the 3pt hitch and the FEL can be used concurrently....

J_J · Feb 9, 2012

Yes.

If your system calls for 1700 psi relief, adjust it down to that setting.

If you do it right, you will be able to use the FEL and the 3pt with out switching.

If the FEL is using all the fluid, there won't be any left for the 3pt. If you use only half for the FEL, then, you can use both the FEL and the 3pt at the same time.

Does your PB fitting look like the picture?

vtmbz · Feb 9, 2012

Not sure what you are asking. The picture is of my PB port.

I tried to hook up the new valve just like the old one was hooked up. I think I got all that right. THe only difference I could see between the old spool valve and the new one was the BYD port, which I dont have a use for at the moment. So I put a plug in it. The port marked OUT goes to the tank.

Maybe the plug in the BYD port is impeding the flow, or maybe there is a blockage that I havent discovered.

J_J · Feb 9, 2012

Let me ask this again, what is the fitting under the plug.

Did you receive the valve with PB installed? Did you just add a plug to the fitting?

vtmbz · Feb 9, 2012

NOw I understand your question! I will have to wait until tomorrow to answer that. I will photograph and send it.

J_J · Feb 9, 2012

There is a difference in a PB sleeve and a hex head plug. Looking at the picture of the valve, it looks like you added the PB sleeve and then you added a plug. You just made that valve a closed center valve, and it will block the fluid through the valve, and with your FEL valve levers in neutral, the pump fluid is flowing out the relief vlave, and squealing, if it doesn't blow up anything.

Just remove the hex plug and use the PB in the normal way. The PB hose goes to the next valve.

Take a pic of the hyd block also.

If you look at Roy's PDF, it will show the valve with an open center hex plug in the PB port.

A PB sleeve blocks off the galleries and allows the pump flow to flow downstream.

If you add the closed center plug, it is a solid plug that extends into the valve and closes or blocks the pump fluid. The only fluid that flows out a Closed center valve is the cyl expended fluid.

If you unscrew the fitting and remove the hex plug take a pic from the side of the fitting and through the fitting, then we will know for sure. See if you can get a pic inside the PB port

SSdoxie · Feb 9, 2012

Looks like they sent you valve with power beyond sleeve installed. See the photo. Take that sleeve out and install the plug directly in the valve.

With power beyond installed and plugged off is same as closed center.

J_J · Feb 9, 2012

If you do that, you make the valve an open center valve, and total pump flow and cyl expended fluid flows back to the hyd block.

I say if you have PB to use it.

I can almost bet the manufacturer says to run or must run the out/return hose to tank.

SSdoxie · Feb 9, 2012

vtmbz said:
I noticed in the circular that the preset relief of the eaton valve is 2000 psi, while the tractor wants 1700 psi. Would this have any bearing on my issue?

If I understand what your previous post said you are recommending that I plumb things so that both the 3pt hitch and the FEL can be used concurrently....

Leave the relief in the Eaton valve @ 2000 psi, it will function as a secondary relief for the loader in case the primary 1700 relief sticks.

You could replumb the system to have both FEL function and 3 pt without changing the selector valve under the seat. Take the line currently running from pump to selector valve and run to inlet of the Eaton valve, come out of the Power Beyond sleeve run that line to the selector valve. Then leave the selector valve in 3 pt. all the time and both will function.