Custom hydraulic backhoe thumb

[IslandTractor]

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

I just gave him the model number that was in the link dfkrug posted a few days ago. I did not know to ask for anything else. To be honest, I feel like a baby walking through a mine field here. I can almost understand electricity and plumbing but hydraulics just leaves my head spinning.

 

[IslandTractor]

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

Thanks Brandi. Now I just need to figure out which is #1 and which is #2. I guess trial by error may be necessary.

 

[dfkrug]

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.

I see what you are getting at. Yes, the upstream valve in the stack would have priority, so you certainly
could put the thumb on #1, and the hoe on #2. In general circumstances.

I did not consider that cuz when you buy the OEM AUX valves from Kioti, #1 is detented and #2 is not
(tho I think it has float). That's the setup for the CK25/27/30/35 anyway. CK20 has only one AUX
offered. The detented valve is for the hoe.

I can not say for certain that the Kioti DKs all do it that way with the OEM AUX valves. If not, then IT,
tells us what you have.

 

[avc8130]

I see what you are getting at. Yes, the upstream valve in the stack would have priority, so you certainly
could put the thumb on #1, and the hoe on #2. In general circumstances.

I did not consider that cuz when you buy the OEM AUX valves from Kioti, #1 is detented and #2 is not
(tho I think it has float). That's the setup for the CK25/27/30/35 anyway. CK20 has only one AUX
offered. The detented valve is for the hoe.

I can not say for certain that the Kioti DKs all do it that way with the OEM AUX valves. If not, then IT,
tells us what you have.

If they are just standard stack valves, you should be able to re-order them physically...no?

How is your setup on the grapple? Is there a thread about that?

ac

 

[bindian]

I see what you are getting at. Yes, the upstream valve in the stack would have priority, so you certainly
could put the thumb on #1, and the hoe on #2. In general circumstances.

I did not consider that cuz when you buy the OEM AUX valves from Kioti, #1 is detented and #2 is not
(tho I think it has float). That's the setup for the CK25/27/30/35 anyway. CK20 has only one AUX
offered. The detented valve is for the hoe.

I can not say for certain that the Kioti DKs all do it that way with the OEM AUX valves. If not, then IT,
tells us what you have.

How are they numbered? :scratchchin: Sitting in the tractor's seat left as #1 and the right as #2?:confused3:
I had a non-aviation friend label stuff..............drivers side and passenger side. Drove me up the wall as I learned the Captain's side is always the left or #1 side and the co pilot's side is the right or #2 side. Except in helicopters.:gloomy: Then everything is backward.:banghead: The Captain sides on the right and the co pilot sits on the left.
hugs, Brandi

 

[avc8130]

How are they numbered? :scratchchin: Sitting in the tractor's seat left as #1 and the right as #2?:confused3:
I had a non-aviation friend label stuff..............drivers side and passenger side. Drove me up the wall as I learned the Captain's side is always the left or #1 side and the co pilot's side is the right or #2 side. Except in helicopters.:gloomy: Then everything is backward.:banghead: The Captain sides on the right and the co pilot sits on the left.
hugs, Brandi

I don't know how the numbering works either, but I'll try to explain what I think is happening and what might be able to be done to "fix" it.

I'm pretty sure the rear remotes are a "stack" valve. The way I UNDERSTAND these to work is that hydraulic flow enters one side of the valve from the tractor. This flow than normally travels through the stack valve and out the other side to either the PB or Tank port when no valves are in use.

I believe the 1st valve along the path is the detent valve he is using for his hoe. When he puts that valve in "detent", the flow enters from the tractor and then goes out one work port in the 1st valve...through the hoe...back into the other work port...and straight to tank. It never gets a chance to continue through the valve stack to be used by valve 2.

If he physically swaps the order of the valves in the stack (assuming this is possible), he can put the detent valve 2nd. This would have the flow going through the stack past the non-detent valve at all times before looping through the detent valve for the backhoe. Now when he uses his thumb, the flow will be "stolen" from the detent backhoe valve and run through the thumb circuit.

Does any of my thinking make any functional sense?

ac

 

[IslandTractor]

Unfortunately it will be a week or two before I can get down to my tractor and experiment. I currently use the detent valve (closest to driver) for the back hoe and use the spring return valve for my topping lift. When my BH is not mounted, I loop the ports together with a short U shaped hydraulic line and quick connects so I don't ruin the hydraulics if I accidentally activate the remote. I would imagine that if the port is activated that would be the same as having the BH mounted and active but not actually moving. I'll see what happens when I activate that circuit and try to adjust the topping lift.

 

[avc8130]

Unfortunately it will be a week or two before I can get down to my tractor and experiment. I currently use the detent valve (closest to driver) for the back hoe and use the spring return valve for my topping lift. When my BH is not mounted, I loop the ports together with a short U shaped hydraulic line and quick connects so I don't ruin the hydraulics if I accidentally activate the remote. I would imagine that if the port is activated that would be the same as having the BH mounted and active but not actually moving. I'll see what happens when I activate that circuit and try to adjust the topping lift.

I don't think you need that loop. If you "accidentally" activated the remote with nothing connected you would just hear the pressure relief valve as the fluid tried to move against the closed quick connects.

ac

 

[IslandTractor]

I don't think you need that loop. If you "accidentally" activated the remote with nothing connected you would just hear the pressure relief valve as the fluid tried to move against the closed quick connects.

ac

Yes, it does sound different when the remote is deadheaded, but that sound is easily lost in the myriad tractor noises and all too easily ignored. A number of folks have damaged their hydraulics by inadvertently activating a remote that was not connected. My dealer, who is not a worry wort, went out of his way to make that point. Besides, for just twenty bucks or so it is good insurance and also is better than caps for keeping the ports clean. I just store it in the tool box when the BH is mounted.

 

[dfkrug]

How are they numbered? :scratchchin: Sitting in the tractor's seat left as #1 and the
right as #2?:confused3:

Yeah, the Kioti docs are not clear. I would number any stack valve as #1 valve being closest to the IN line, then
#2, etc. Regardless of left or right positioning. The lower the #, the higher the priority.

I do not have the 2nd AUX valve from Kioti, but the instructions say that if you get the 2nd one, it must be
installed in a particular order or they will not work. In re-reading the docs just now, it is not really clear which
valve is the upstream one when both are installed. There is no substitute for a field test.

The stack of 2 valves uses internal passages for OUT and PB. The IN connection is to the #1 valve and is
an external hardline. That leads me to think that the second valve is plumbed after the 1st.

25 y ago I took a helicopter flying lesson in a Robinson R22 (piston-engine helicopter) and I
sat in the right-hand seat. The instructor (a very patient woman) sat in the left. Could it be different
in New Zealand?