Backhoe hydraulic hook up

[orangeman2009]

I have a Kubota M6800 with a M720 loader and I would like to know where to hook up my Woods 1025 backhoe on the tractor's hydraulic system. I Have two remote hydraulic valves in the back, I don't want to use them because I have to jam it open with a bunggie cord or wedge the valve open. Any suggestion would be appreciated.

 

[J_J]

If you have PB on the rear valve, add a detent valve for use with the BH. If you have to , you can take the Tank port from the Rear remotes and run that to an OC detent valve IN port, and that will complete the loop. The output of the BH valve will go to reservoir.

 

[orangeman2009]

Sorry I'm a newbie at this and still a bit confused. I don't think I have PB on my rear valve. Put I think I have it on my loader control valve. My loader valve has 2 lines coming from the pump and one going back behind the tractor to the transmission case (I assume this is the return). So basically I need to get oil pressure to my backhoe's inlet valve and return the oil back to the tractor's reservoir. I'm confused how to accomplish that with PB. I will post pics later maybe that will help. Thank you.

 

[J_J]

Do you not have your rear remots connected to the PB port?

 

[J_J]

If you are not using the PB port on the FEL, then remove the PB plug and install a PB sleeve for your valve, and run the hose from the PB port to the back and install a detented valve for the BH.

 

[orangeman2009]

I guess I'm not exactly sure what PB really is. I'm wondering if I can get a 3rd remote valve with a detent for my Kubota M6800. I have 2 remotes one is a SCD (self canceling detent) and one is a FD (float detent), they both return to neutral when the lever is released. Any one knows is I can get one and where. I included diagrams of my rear remote valves. Sorry I don't have anything for the FEL valve.Thank you.

 

[kennyd]

You have 7 hoses connected to the backhoe valve correct?

On of these is connected to the "power beyond" port and should be labeled PB. That hose feeds the 3PH at the rear and should be connected to the tranny case.

You need to remove that hose, and add two longer ones that will reach to the rear to connect your backhoe. These hoses will have the full flow of the hydraulic pump whenever the tractor is running so you must ensure they are always either hooked together using QD's (quick disconnects) or coupled to the backhoe-you CANNOT interupt that "loop" while the tractor is running.

 

[orangeman2009]

Here's a few pics of my FEL valve. Hope this helps.Thanks for all the replies.

 

[jgrobert2720]

Yeah orangeman2009 I completely agree with kennyd. The third picture you have uploaded in this discussion shows, (in red) the port where the flow from your hyd. pump enters the tractor valve system, correct? If that is correct, then as kennyd suggested, simply splice into that circuit and plumb it to the backhoe and return it to that hydraulic circuit at the other end of the splice. Also as kennyd remarked, that hydraulic circuit must have a continuous flow path from pump back to the return reservoir, even if it's through the tractor valve set-up and/or the backhoe control valve body.
I made a crude drawing of what I'm talking about. Hope you can catch your breath after laughing. LOL. But, maybe you can get some help from it.
Simply splicing the original tractor piping at the red "X's" and plumbing in the lines (red & blue) to and from the backhoe valving. And, of course the purple part of the line (in the drawing) is to be removed.
Hope that helps.
View attachment 142901

 

[jgrobert2720]

Orangeman2009: This web page link (below) shows the basic principals behind the open center hydraulic circuit and why the pump discharge must be returned to the reservoir. If not it will short circuit through the relief valve and cause excess heat build up to the hydraulic system and damage the pump and relief valve eventually. Not to mention rob power from the tractor itself. Basic Hydraulic Open Center System Schematic - Engineers Edge