Question regarding use of backhoe hyd. connections

[KubotaOwner]

Forgive my perhaps dumb question as I have no experience with hydraulics and the terminology, and am also a new Kubota owner.

I have an L3700SU TLB and was wondering about how to connect a hydraulic top link for use with 3 pt implements. Is it as easy as adding a valve/controller plugged into the quick disconnects for the backhoe?

Thanks!

 

[wdchyd]

Yes.....just make sure the connections are set up right......pressure/in & return/out......

 

[KubotaOwner]

Yes.....just make sure the connections are set up right......pressure/in & return/out......

Thanks!

 

[kennyd]

If you do some searching-this has been discussed 100's of times Terms like "remote" and "power beyond" will return hours of reading.

 

[Ductape]

Though you could do it that way....... I wouldn't recommend it. I would permanently plumb the valve in. If you are buying a valve, hoses, fittings, etc...... its not like it will be more expensive or more difficult to have the rear romote valve plumbed permantly into the system.

 

[Jay4200]

Forgive my perhaps dumb question as I have no experience with hydraulics and the terminology, and am also a new Kubota owner.

I have an L3700SU TLB and was wondering about how to connect a hydraulic top link for use with 3 pt implements. Is it as easy as adding a valve/controller plugged into the quick disconnects for the backhoe?

Depends on how it was plumbed, and there aren't any standards. Generally, a valved function is a 3-terminal connection: input (pressure input), output (return to sump), and power-beyond (pressure line to the next function). Only the last function is two-terminal, which on my tractor is the 3pt hitch. My guess is that you have only two lines going to the backhoe.

My tractor (Kubota L4200) comes with a hydraulic block that drives the 3pt hitch. Turning a valve on the block diverts closes off the flow to the hitch, diverting it to an outlet hose (which goes to the 'IN' terminal for my loader). The loader's power-beyond outlet then is either returned to the 3pt to run that, or went back to the lines for the backhoe, at which point the 3pt was disabled. A hose had to be manually swapped to change from one to the other. As such, I had a choice of running the rear PB lines, or the 3pt hitch - but not both.

I ended up running one additional line from the back of the tractor to the 3pt hitch input. That way, I have the original PB from the loader and return (to sump) lines, and a new PB line to the 3pt. Connecting the two PB lines together enables the 3pt. When I connect the backhoe, I leave the 3pt PB line unconnected (now the backhoe is last in line). Any remote valves (with 3 terminal connections) can be placed in the back to run other stuff - there 'IN' port being powered by the PB line from the loader, their PB output going to the 3pt, and their 'OUT' port going to the return line.

In the pic, the two female QCs mounted onto the ROPS are the original backhoe connections - one PB from the loader and the other return to sump. The long line above those QCs (with male connector) that is plugged in closer to the valves (connects to the valve's PB output) is the PB line that powers the 3pt hitch.

JayC

 

[skyhook]

Hope you don't mind, i'm resurrecting this thread, Jay,,
Lots of good info here,
I also have the same tractor, L4200 with loader and 2 rear remotes.
I want to install a hoe also,

My first question is, can i use one of the rear remotes to "dress' the hoe,
it's been sitting for some time and is leaning badly, it has two lines on it also.
Will using the rear remote cause any damage? (I would bungee the lever "open" for this).
Also if this is feasible, can I permanently use this rear remote?
I would like to have all hyd fluid available for the hoe, or most of it anyways.
I wouldn't need the 3pht or the rear remotes when the hoe is in use.

I've read your post and the others and am still a little confused,,
did you "tap" into the power beyond from your loader spool to your hoe by disconnecting it and
adding a QC to it for the hoe?
If so, wher did the return line of the hoe go?
As you know, most of the hyd lines are steel tubes on these, not too many hoses around the 3pth.
You said something that got my attention...

Only the last function is two-terminal, which on my tractor is the 3pt hitch.

I'm not too well versed on hyd's, so treat me like a fifth grader....lol
Any help or input will be appreciated.

 

[J_J]

Since your BH is two hoses, you would remove the hose going into the tractor for the 3pt, and install a QD on it to match the BH IN hose.

Your BH return hose can connect to any return hose or directly to the filler cap.

Then install a short hose with a QD to the 3pt IN port.

When not using the BH, separate the BH IN hose and couple that to the 3pt hose. Now the 3pt will work normally.

 

[skyhook]

Thanks JJ, I'll have to check again, but I'm pretty sure the 3 point "in" hose is "piped" in.
It has one of those funny ends on it, but I'll re-check it to verify.
The only "return" line I can tap into is the "out" from the spool for the loader.
Could I add a "T" of some sorts in that....
What about the rear remotes, can I use them (temporarily) to re-position the hoe?
If I remember correctly, my power beyond goes to block that feeds the 3 pth and the rear remotes,
if that were the case, could I put a QC on the PB from the spool, connect to the hoe,
and use the "out" on the loader spool as a return?
The only "hose" I have to play with is that PB hose from the spool of the loader,
all the rest are "piped" lines.
There are four hose's for the rear remotes, but then they go to a block and again, are piped into the system.

 

[J_J]

Yes, you can use the remotes to move the BH or even run it by bungeeing the lever open.

You can tee a return line. A short hose with a QD.