Loader Massey Ferguson 40 Power Beyond on Model 34 Loader

[Thumbs Up Farm]

I need some info on how to attach to the Power Beyond port of my loader. I have a Massey Ferguson 40 with a Model 34 loader. I also have Big Deans CD that I purchased from him when I bough the tractor. I have several projects/attachments that I would like to run from the Power Beyond.

I have two issues that I need to resolve.

1.)Big Deans CD shows that there is a plug on the Loader control valve body that has another plug under it?? His instructions on this is a bit confusing. Is there another plug, under the one on the surface, that must be removed or is there something that must be added inside there?

2.) Big Deans CD shows the Power Beyond port at the bottom of the Loader control valve body and says that a special fitting is needed to attach the hose going to the new remote control valve. What is this "special fitting"?

I am sure I can complete these projects if I can understand what needs to be done at the loader control valve to supply pressure to my remote valve. Any help/info would be appreciated.

Thanks,

 

[J_J]

In order to use the PB port, there is an adapter that will close off the main gallery and separate the return/OUT with the main flow.

It will be a hex plug or a PB sleeve. Your dealer will have or will show you the correct part.

The PB port is the high pressure port for the main flow path.

Try several different ports. If it is just a plug, the gage will act as a plug, but if in the main gallery, it will indicate pump pressure.

In order to see pressure, you have to work the hyd and to see relief pressure, just max out the cyl and hold it for a few sec.

If you can not determine the pressure, then the loader valve will be the main PRV, and yu can set the remote valve to max clockwise or use large shims to keep the remote relief from operating.

So now, you will have the loader relief valve and the 3pt relief valve.

If you drop by the dealer, the hyd tech in the back will help you determine the gage port.

It is just a matter of deduction.

The PB adapter will be one of these.

 

[Thumbs Up Farm]

Big Dean seems to indicate a plug is needed inside the valve body. Is that what you are also telling me about the return/OUT?

I looked at the valve and the PB port has a large, what appears to be, hex adapter already in place instead of the socket head plug. It has a square plug apparently brazed into the end of the adapter. I am thinking that maybe the previous owner had a backhoe or other attachment, wanted to remove it, and just plugged the adapter.

I guess I will have to take all of that apart to see what is in there.

Assuming I take this plug/adapter apart and can cut off the plug/brazing to reclaim the adapter. Can I just screw in the test gauge in the PB adapter and see the system pressure? I shouldn't have to open any spools to see pressure on this port, correct? What issues might I have with this?

 

[J_J]

Please show a picture of the PB port as is, and then another picture with the large hex plug removed showing the inside of the port.

Here is an explanation about the PB port.

The PB port is designed to pass high pressure fluid to the next valve.

When the valve comes from the factory the main flow ans the cyl flow flows through the OUT port, and if that is the last valve in the series path, that is OK.

Since most all tank ports should go to tank, because there is a back pressure on th eOUT port usually in the 500 psi.

This is where the PB adapter comes in.

If your valve uses the internal hex screw, it will separate the main gallery from the return/OUT port, making your valve an open center valve with PB..

The PB sleeve in other valves does the same thing.

The PB port is also used to make the valve a closed center valve for closed center hyd systems.

A plug is inserted in the PB port to make the valve a CC valve.

If you have the hex screw inside, and a large hex plug, that valve is setup for closed center.

If the valve has a PB sleeve, and a large hex plug, it is a closed center valve,

If you only have a small hex plug inside, and an open port, that is a PB port and can pass fluid to the next valve.

If the valve has a PB sleeve installed and an open port, that is a PB port and can pass fluid downstream.

You need to install the test gage in a tee in the first valves IN port to monitor the complete the hyd system.

Once you get the PB right, just run a hose to the next valves in port, or make yourself a QD setup for a BH.

 

[Thumbs Up Farm]

Thanks again J_J,

This is starting to make sense to me now and may explain another issue with my control valve that I had forgotten.

The loader boom control cause the engine to be loaded when lowering the boom arms. Is it possible that because the PB adapter has been plugged and the internal plug is in place that this is causing what should be an open center system to be closed center thereby creating the resistance to the pump when lowering the main boom arms?

I will send pictures when as soon as I can get this apart.

 

[namyessam]

I need some info on how to attach to the Power Beyond port of my loader. I have a Massey Ferguson 40 with a Model 34 loader. I also have Big Deans CD that I purchased from him when I bough the tractor. I have several projects/attachments that I would like to run from the Power Beyond.

I have two issues that I need to resolve.

1.)Big Deans CD shows that there is a plug on the Loader control valve body that has another plug under it?? His instructions on this is a bit confusing. Is there another plug, under the one on the surface, that must be removed or is there something that must be added inside there?

2.) Big Deans CD shows the Power Beyond port at the bottom of the Loader control valve body and says that a special fitting is needed to attach the hose going to the new remote control valve. What is this "special fitting"?

I am sure I can complete these projects if I can understand what needs to be done at the loader control valve to supply pressure to my remote valve. Any help/info would be appreciated.

Thanks,

Be sure your loader is a 34 there is also a 34a 34b and 34c
Go to agcopartsbooks.com sign in as guest user. search 34 loader / Massey Ferguson select 34 loader click on control valve (w / self leveling) If this looks like your control valve this mfg note is found in the top right hand side with the parts list. Hope this helps. I'm still confused on the power beyond also. Hope I can learn something here.

9905-10814

ITEM 1 708600M91 FOR THE POWER BEYOND USE
70917970 PLUG AND 366851X91 FITTING.(PARKER HANNIFIN)
ITEM 3 1093783M1 WAS EXTERNAL THREADS, NEW INTERNAL
THREADS. ALSO NEED TO ORDER P/N 3780821X1
SET SCREW ALSO.

 

[Thumbs Up Farm]

Thanks nayessam,

I think I already have the adapter and that the previous owner has plugged the adapter, brazed it shut, and did not remove the internal plug. Which according to J_J makes the system closed center instead of open center as it should be.

If my thinking is correct, then this will mean that the fluid cannot pass through the, now plugged hole, from the loader boom valve which is the last valve in the circuit, and back to the tank. That means that my pump is being loaded when lowering the boom because all the returning oil is being forced through the pressure relief.

This valve does have the boom float and secondary auto level positions on the boom lift, although until now, I never knew it.

I am hoping J_J can shed more light on this and I will try to take this apart in place on the tractor and get some pictures. Hoping I will have an ah ha moment and know what to do.

 

[Thumbs Up Farm]

Ok, so maybe my thinking was wrong on the internal plug being present, it wasn't :shocked:

I remove the side plug and there was no internal plug inside like I thought there would be. That means my boom lift arm issue is not caused by the internal plug being present while the PB was plugged

So, back to the issue at hand. I have a couple of pictures.
1 is of the of the PB adapter (converted to a plug) as mounted in the valve. The other is of the adapter/plug after I took it out. You can see the brazing that was done on the adapter around the square end that converts it to a plug.

Anyway, I called my local Massey Dealer and he has the plug/adapters that I need to attach the PB. So, I think this will solve this issue for me. Thanks for everyones input:thumbsup:

Now, I just need to correct the other issues with the loader control valve, determine my system pressures, and order my auger system parts. In case you didn't pick up on it, that last statement it was a cry for more help.

Here is the link to the other forum topic with more info on the loader valve issues. http://www.tractorbynet.com/forums/hydraulics/292165-loader-valve-test-port-location.html

 

[J_J]

The plug you show with the brazing is a fitting adapter and not a PB adapter.

What someone did was to braze a cap on a fitting, making the valve an open center valve, allowing the full pump flow and the cyl flow to exit the OUT/return port.

You have no PB at the present.

 

[Thumbs Up Farm]

Thanks J_J,

Yes, I understand that I have no PB at the moment. I have the adapter and internal plug order from my local dealer. Should have it Wed. I think the fitting I have with the brazed plug is acually the adapter. It has internal threads in it that can be seen in the picture. The reason I say that is because this thing is 1 3/16" NF thread and I couldn't find that thread anywhere on Hydraulic supply sites.

Once I get the plug and adapter I should be able to install PB.