Why no "Power Beyond" for Kubota tractor?

[k0ua]

I was going to write another book about how regeneration works and why you would maybe want it in a valve. But this guy explains if pretty well.
I haven't seen rear remotes or Selective Control Valves with regen, but I can see why you might want one. An example would be extending the batwings on a mower for instance, a low load but you might like the high speed. Many Kubota (and other brands) have regen on the loader valves. This is for a "fast dump" function to dump the load rapidly. The load actually helps the regen function. End result the worktime is reduced as you don't wait on a bucket to dump if you just used the normal speed of the pump flow to fill the cylinder. The additional flow from the rod side of the cylinder can be added to the cap side to push that piston out faster. Watch this video with diagrams to help out with understanding regen. When you are done you will have a much better understanding than a lot of mechanics.

 

[Cat_Driver]

It sounds like it's not the Kubota BH.

I think Kubota makes a kit that would give you the BH connection. It should be a loop of hose at the back that is connected with male and female connectors. You disconnect it and connect to the male and female on the BH. That puts the BH in the loop. Like what you're doing with having your wife hold the valve open but without the valve and wife.

You can make the same without the kit, if it doesn't exist or is expensive. There should be a line from the remote valve body to the transmission. You'd replace that with a line that has the male and female connectors in it.

BTW I wonder if regen on the remote valve is causing your BH freezing up problem.

I've come to the conclusion with everyones guidance that I ned to do as you and all other suggested get the fluid BACK to the transmission.

Now the problem is HOW. I have four ports used for two rear attachment quick disconnect. Two ports used for the loader. Two ports used for the grappler and the dealer locally doesn't seem to understand the concept of what you are all advising about the loop.

I may disconnect one of the rear quick disconnects and use that return back to the transmission OR somehoe make a T

 

[Cat_Driver]

You should still write the book. You way of explaining is amazing and helpful to the lay person.
You have so much knowledge it needs to be shared and you need to make a buck or two.

Even if you do a PDF book for download on Amazon for $2.99 it would be worth it.

 

[k0ua]

You should still write the book. You way of explaining is amazing and helpful to the lay person.
You have so much knowledge it needs to be shared and you need to make a buck or two.

Even if you do a PDF book for download on Amazon for $2.99 it would be worth it.

Thanks for the kind words. You should see me lecture on subjects I REALLY know something about, (electronics/radio/antennas). Most of my hydraulic knowledge is theoretical, not practical. I was a tech, then engineer with telecom companies, so electronics is more my forte.

 

[ericm979]

I've come to the conclusion with everyones guidance that I ned to do as you and all other suggested get the fluid BACK to the transmission.

Now the problem is HOW. I have four ports used for two rear attachment quick disconnect. Two ports used for the loader. Two ports used for the grappler and the dealer locally doesn't seem to understand the concept of what you are all advising about the loop.

I may disconnect one of the rear quick disconnects and use that return back to the transmission OR somehoe make a T

If you tee into two valves, neither will work as the flow will continue through the other side and won't build pressure in the cylinder you're trying to move. (unless you operate both at once, but that's not practical).

You can make your BH loop by replacing the line from the remote's valve body to the tank (transmission) with one that has male and female connectors. Keep them connected when the BH is off so the flow is the same, and connect them to the BH when its on. That puts the BH valves in the chain. If your remote valve body is bolted to the transmisison and it's output dumps directly into it, then you'd use the line from the loader valve to the remote valve body.

 

[Tractor Seabee]

Cat Driver,

I am still not seeing your whole picture. I posed some clarify questions you have not answered. Let's take the BH situation first. Do you have, or are contemplating getting the Kubota companion BH for your L? If not; are you using a third party frame mounted BH? If not that; are you thinking a 3 point mounted BH? Those are your only options. They may present different solutions depending on how they come equipt. Once you answer those questions we can get down to specifics of your installation. If you are getting the Kubota BH it should come with everything you need, make sure it does.

Believe me I am trying to help, not harass. Since getting my BX I have done a lot of research into hydraulic systems. Do you have the WSM for your L? If not get one, it is essential for what you are contemplating. Around $100, and have to order from a dealer.

Ron

 

[lilranch2001]

James has given many helpful tips over his 10 years on TBN, and is always a gentleman

 

[Michael In Tennessee]

It sounds like you are getting some useful information. I'll add my own and hopefully, it helps rather than confuse.

Your Kubota L4060 is quite similar to my MX4800. It is important to have Kubota unique information and not just generic info.

On your L4060, your rear remotes are fed from a port on the side of your 3 pt cylinder under your seat with hard lines that are custom built for your model tractor and are not very useful for a backhoe. Using the rear remote is an unnecessary burden for powering a backhoe as well.

So, lets completely ignore the rear remotes for this issue.

What you want to do is to mimic the way Kubota powers the OEM backhoe. As has been previously mentioned, they install the backhoe with a loop of hose from the PB port of the FEL to the back of the tractor, returning the fluid to the hydraulic block under the floorboard on the right side of the tractor. This takes two hoses and a male/female quick disconnect pair. The hose from the FEL power beyond port to the rear is about 8 ft long and the return is about 6 ft long. Use some garden hose or such to snake through the tractor frame and measure out for your specific tractor. Use the same diameter hose, with the same type of ends, as currently used from the FEL PB port to the manifold block. (My MX is 1/2" with JIC flare fittings.)

Since the picture you posted of your aftermarket Backhoe hose diagram does not show a tank line, then it hooks up just like a OEM backhoe and two lines are all that is needed. You do not need a tank line.

At the FEL valve, the power beyond connection should be the most outboard hose that is not a hose going forward to the FEL. It should go from the FEL valve to the block under the right floorboard. That hose gets removed and replaced with a long hose to the rear of the tractor terminating with a QD. Then, The mating QD and a hose come back forward to the hydraulic block under the floorboard.

Now, if you do what I said in the previous paragraph, you will see that all you have effectively done is created a really long output hose from the FEL. Logically, no hydraulic re-routing has been done, but you now have power beyond capability at the rear of the tractor.

Then, you add mating connectors to your backhoe, connect it up and your done.

NEVER, EVER start the tractor without the backhoe connected or the two rear hoses connected. The flow loop must always be functional.

This also works on your trencher IF your trencher has its own control valves and does not have a provision for a tank line. If you need control valves for your trencher, then a different conversation has to occur around that specific tool.

 

[ericm979]

Doesn't Kubota make a kit for this? Perhaps the dealer's not understanding what it is that you want.

When I go on Kubota's build tool and add a backhoe to a 4060 it adds two packages, one of which sounds line a mount. The other ($300 something) might be the hydraulic connection.

 

[Tractor Seabee]

I think we all need to sit back and get back down to basics. Poor Cat is probably so overwhelmed with information on a subject he does not understand to begin with, that he cannot think straight. I am probably as guilty as anybody with providing information that does not bear on his basic problem. With long discourses he probably gets lost in the first couple sentences.

As I have asked twice now and he as never provided an answer to the basic question: What BH are you trying to connect; Kubota companion to his L, some brand after market frame mount, or 3 point hitch unit. That probably creates 3 different solutions. One of his posts has a BH piping diagram that could allude to an after market BH. From what I know about Kubota all their BHs have a return to tank (T) line from its valve stack.

Once he answers that question, we can probably provide a direct to that unit definitive answer. Pictures and diagrams always help more than words as long as they deal with his specific brands and models.

Ron