Custom hydraulic backhoe thumb

[IslandTractor]

If you detent the first valve open, all of the flow is flowing through the backhoe. You MIGHT get some flow at the 2nd valve if the restriction is less than the first circuit. You could also probably swap the valve order in the stack and make it work. ac

I can understand that if I am actively digging there might be no flow left for the thumb but if my hands are off the BH controls, shouldn't there be flow to the second valve/remote??

 

[avc8130]

I can understand that if I am actively digging there might be no flow left for the thumb but if my hands are off the BH controls, shouldn't there be flow to the second valve/remote??

I don't think so. You have diverted that flow to the hoses on the valve rather than through the power beyond within the valve.

At least that is my interpretation.

You could test this if you have a cylinder you can hook up while you have the backhoe connected.

ac

 

[dfkrug]

If you detent the first valve open, all of the flow is flowing through the backhoe.
You MIGHT get some flow at the 2nd valve if the restriction is less than the first circuit.

Yes, all flow from the first valve goes thru its work ports to the hoe, regardless of the position of the hoe's
valves. The hoe is also an open center (tandem center) valve.

The return flow from the hoe is back thru the 2nd of the 2 work ports on the AUX valve, which goes to the
tank from its Out port. No flow goes from the 1st AUX valve thru the internal Power Beyond passage to the
2nd AUX valve. Therefore the 2nd AUX valve is non-op as long as the 1st AUX is detented ON.

I don't know what your 2nd sentence means, AC.

 

[dfkrug]

$140 each. Not too bad. Takes a few weeks to get.

Not bad at all. Did you use the MFGR quotation request form on the HydraForce website? If so,
you then have to go to a disti to sell/ship it to you. Maybe adds $35-50.

I see no downside to using this valve over the manifold-mounted valves. It is SOOOOO much less, too.

 

[kennyd]

$140 each. Not too bad. Takes a few weeks to get.

I don't quite understand the six port configuration and operation but that certainly is quite a bit less expensive than the WR Long diverter valve. Not sure what the relative benefits/pros/cons are of this valve vs the more standard diverter valve set up though. I have a diverter valve from WR Long that runs my grapple from the FEL circuit.

IT, did you clarify if that price included the valve body itself? I think it may be just for the cartridge and solenoid possibly?

 

[dfkrug]

Also, I wonder if my DK40 might be plumbed a bit differently than the CK I suppose.

That is why I asked. Kioti has moved toward using detented AUX valves to power their hoes. They used to have
manual diverters, but that's another topic.

Anyway, powering the hoe this way works, but is not ideal. The usual way is to insert the hoe valve stack in the
Power Beyond daisy chain of valves on the tractor. Usually that means after the FEL valve and after
the AUX valve. The hoe valve "never" has PB, so it should be the last in such a daisy chain, draining into the tank.

I have already modified my detented work-port hoe configuation by connecting the hoe return hose to the tank
instead of the B work port on the AUX valve. That relieves some back pressure and fluid heating.

 

[dfkrug]

I think it may be just for the cartridge and solenoid possibly?

I am sure that is a complete valve. I would have guessed about $150, about 3-4x what
the SV08s are above.

You should try one of these, Kenny, cuz you have familiarity with the D03 valves, and have done
installs in the past. You can provide some pro/con info with experience. I have never bought
the manifold valves before, myself.

 

[kennyd]

I am sure that is a complete valve. I would have guessed about $150, about 3-4x what
the SV08s are above.

You should try one of these, Kenny, cuz you have familiarity with the D03 valves, and have done
installs in the past. You can provide some pro/con info with experience. I have never bought
the manifold valves before, myself.

D, I have no personal experience with DO3's since they are so bulky and most of my work is geared towards smaller machines. I am a proponent of using diverters most of the time especially for grapples and such as I believe they offer a cleaner install, and the PB lines on JD tractors are not as accessible as they are on other machines. When I helped design the diverter I sell, small and easy to mount was top priority.

This little valve is intriguing, but for most applications you would need to switch both lines for complete control, and that one does not do that from what I can see.

 

[avc8130]

Yes, all flow from the first valve goes thru its work ports to the hoe, regardless of the position of the hoe's
valves. The hoe is also an open center (tandem center) valve.

The return flow from the hoe is back thru the 2nd of the 2 work ports on the AUX valve, which goes to the
tank from its Out port. No flow goes from the 1st AUX valve thru the internal Power Beyond passage to the
2nd AUX valve. Therefore the 2nd AUX valve is non-op as long as the 1st AUX is detented ON.

I don't know what your 2nd sentence means, AC.

It means I'm punished to another hour of staring at the hydraulic circuit diagram. Haha

Ac

 

[bindian]

You can not use your 2nd AUX valve to power a thumb if the 1st one is used to power the hoe, since no fluid gets
to the 2nd one while the first is detented in the ON position.

Yep, learned that years ago after getting my BH. Can you put the BH on #2 aux and the thumb on #1? I know you can do that on a Mahindra 4110, as a friend does this.
hugs, Brandi