3rd function valve

[J_J]

Yep, I do see now, and the flow does go to the BH first,and then to the loader. . So the BH will have priority over anything else.

There must be a relief valve on the hyd block, as it is before the BH.

I don't see a relief valve on the loader valve, but I do see three relief valves on the BH valve.

The loader also feeds the 3pt valve.

 

[Rustyiron]

Talk about misuse of a term, look what they call a Marriage these days!:laughing::laughing:

 

[Tractor Seabee]

Yep, I do see now, and the flow does go to the BH first,and then to the loader. . So the BH will have priority over anything else.

There must be a relief valve on the hyd block, as it is before the BH.

I don't see a relief valve on the loader valve, but I do see three relief valves on the BH valve.

The loader also feeds the 3pt valve.

JJ, The main circuit relief is an attachment to the HST housing and it is the main relief for the attachment and 3PT circuit. What you may see as a relief valve at the BH valves is what they call a Load Check Valve in one place and an overload relief valve in another (appears to be one assembly performing both functions). There is one in the bucket valve and 2 in the swing valve. They are spring loaded but not field adjustable. The FEL has no relief valve. Attached are some more drawings. Reading the WSM manual it comes clear to me as it seems well worded and complete; I think.



We've gotten off the track on the OP but now that we started this might as well enlighten a few of our TBNers that eat this stuff up.



Ron

 

[jeepguy]

First reply for me, but a long long time reader on TBN. I bought a Kubota B26 TLB and want to run a hydraulic chainsaw on the end of the backhoe stick using the backhoe bucket curl circuit. I want to put a T and quick connect on the two hoses running to the backhoe bucket curl cylinder. The bucket will be removed and the chainsaw placed on the end of the stick and plumbed into the quick connect Ts. Using the curl on the joystick to forward and reverse the chainsaw. How far off am I in my thinking that this would be an alternative to third function or diverter setups? Thank you.

 

[J_J]

That will work just fine, but you will need to add a relief valve to lower the pressure to the hyd chain saw as I believe they run around 1500 psi.

I may be wrong, but the label on my hyd chainsaw says 1500 psi.

You might have regen on your valve which may give some problems. Of course, you would only want to run the chainsaw in the fwd direction. So use the non regen work port that will do that.

Also check to see if the saw is open or closed center.

 

[jeepguy]

Thanks J.J.

 

[k0ua]

Alrighty then. One experiment is worth a 1000 words.

As for oil flow from the Power Beyond when the loader lift valve is fully operated, or the Dump/Curl circuit is fully operated, NOT one single drop of oil goes to the PB circuit to run the SCV or the 3PT hitch cylinder.. None, and never will until you let go of the loader joystick.

The fluid flow just runs over the PRV (Pressure Relief Valve) which is before the PB circuit. Now if you feather the loader control to have the lift rising either slowly or even moderately fast, the PB circuit receives flow, and the 3PT will raise approximately normal speed (hard to tell without a stopwatch.) In fact it will be fully raised before the lift will be fully raised. I tried this at idle and full throttle, and got the same results. It is not a matter of not enough fluid flow to raise both at the same time, because there is if you don't try to raise the lift or curl fully.

The loader valve just closes off the PB circuit fully when you operate the joystick fully. So that was my big experiment, and that is at least how a Kioti DK35se loader valve and PB circuit works.

 

[J_J]

I have said all that more than once. Some people are very doubtful.

 

[k0ua]

I have said all that more than once. Some people are very doubtful.

Well we won't be doubting you any more!:thumbsup:

 

[J_J]

Yep, I do see now, and the flow does go to the BH first,and then to the loader. . So the BH will have priority over anything else.

There must be a relief valve on the hyd block, as it is before the BH.

I don't see a relief valve on the loader valve, but I do see three relief valves on the BH valve.

The loader also feeds the 3pt valve.

For those that think the loader is the first and second spool in the FUNCTION list, Looking at the BX25 brings up a new situation, as the hyd flow goes to the BH valve first. First six function is the BH valve with 6 functions.

Now, does that make the BX loader, the seventh and eighth function after the BH?

Unless someone can prove that the loader is the first and second function, I just don't buy it.

But again. Call it what you want.

Da**, I just realized I've got a TRUE 3rd function valve with relief for the rear of the tractor, but with no loader how is that possible? It must be a TRUE first function.

What happened to my first and second function.