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

 

[jgrobert2720]

Orangeman2009: I'd splice it here. Or somewhere between here (red arrow) and the pump and run it to the backhoe valving and then return it to the other end of the splice.

 

[kennyd]

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

Your drawing is incorrect, it would disable the FEL valve if done that way. The backhoe connection needs to be on the PB line, which is technically after the FEL valve.

Also...your avatar is driving me crazy! I had mine for 3 or so years and yours being the same is confusing me!

 

[kennyd]

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

FYI, HERE is a better picture...

 

[J_J]

If the pump input hose is coming into the FEL valve, on the left, which says pressure, then the line on the right is mislabeled. The line/hose on the right appears to be the PB port, and is feeding the rear remotes. So, what are you guys suggesting? He already has hyd fluid to the back, so why not add a detent valve with a PB port, and then connect the remotes to the output of the BH valve. , or add a detent valve after the rear remotes. The jumper hose is a safety factor, in case you accidentally shift the levers into a dead head situation.

The more hose , joints, fittings, orifices, the fluid is flowing through, the more heat is generated. It should be kept simple. Changing out the rear remotes would be the more simple way, using detented valves, and using the BH off the rear remotes. Just doing the bungee thing is the most simple process.with he has as the present time.



If you have a PB output hose going to the back, you do not need to add another hose to the back. The hyd circuit is already there waiting.

 

[kennyd]

If the pump input hose is coming into the FEL valve, on the left, which says pressure, then the line on the right is mislabeled. The line/hose on the right appears to be the PB port, and is feeding the rear remotes. So, what are you guys suggesting? He already has hyd fluid to the back, so why not add a detent valve with a PB port, and then connect the remotes to the output of the BH valve. , or add a detent valve after the rear remotes. The jumper hose is a safety factor, in case you accidentally shift the levers into a dead head situation.

The more hose , joints, fittings, orifices, the fluid is flowing through, the more heat is generated. It should be kept simple. Changing out the rear remotes would be the more simple way, using detented valves, and using the BH off the rear remotes. Just doing the bungee thing is the most simple process.with he has as the present time.



If you have a PB output hose going to the back, you do not need to add another hose to the back. The hyd circuit is already there waiting.

He has "factory" remotes, so adding a detented valve section is not as easy as it sounds...

 

[dfkrug]

He already has hyd fluid to the back, so why not add a detent valve with a PB port, and then connect the remotes to the output of the BH valve. , or add a detent valve after the rear remotes. The jumper hose is a safety factor, in case you accidentally shift the levers into a dead head situation.

You can't put the hoe between two valves because the hoe has only a
low-presssure return (no PB). It has to be the last valve in the circuit
(using PB from the last valve) or you can add a valve WITH PB and
use detented work ports. That is an overkill, however, as you can just
use a diverter valve in the circuit between the FEL valve and the
AUX valves. That is how it is sometimes done from the factory. If you
buy an aftermarket diverter valve and put it between the two valves in
the diagram, then that eliminates the use of any down-stream valves (as
does a detented open-center valve). In this case, the hoe OUT hose
goes to a new low-pressure connection on the sump, or T-ed into the
tank port on any of the other valves.

The AUX valve in the photos does not seem to have a PB; only a Tank
port. I wonder where the 3-pt gets its power?

I would not worry about dead-heading, as there is a RV on the tractor (I
am sure), and on the hoe, FEL, and AUX valves.

 

[jgrobert2720]

Yeah, I see what you're saying kennyd. My bad.

And chill about the avatar.......... we're not 2 years old playing in a sand box.
Mommy, he stole my toy! LOL.

 

[J_J]

dfkrug ,

Look at the fittings for T port, and T1 port, I believe one of those fittings is a PB sleeve, and both the hose goes to the back. The hose on the right back looks more like a PB fitting . Tell me again why a BH valve has to be the last valve in the system. If all the valves are OC, when a valve is not being used, the fluid has a path to tank. Every valve in the system probably has a relief.

 

[kennyd]

And chill about the avatar.......... we're not 2 years old playing in a sand box.
Mommy, he stole my toy! LOL.

I thought that was what your backhoe was for

 

[dfkrug]

Look at the fittings for T port, and T1 port, I believe one of those fittings is a PB sleeve, and both the hose goes to the back. The hose on the right back looks more like a PB fitting . Tell me again why a BH valve has to be the last valve in the system. If all the valves are OC, when a valve is not being used, the fluid has a path to tank.

Yeah, the valve in the photo COULD have PB....I can't tell. You may be
right....maybe T1 is worth checking out.

I agree that you can use a downstream valve as a low pressure path to
the tank. As long as you do not use that valve, however. If the
downstream valve is not likely to be used because mounting the hoe
and its valve essentially KEEPS you from using the downstream valve....then
it is OK. I have done that, but only with the downstream valve being the
3-pt cylinder, which I can not use with the hoe mounted. If you have
AUX valves downstream, then you may want to use them while the hoe
is mounted. That would damage the hoe valves.