Rear Hydraulic remotes?

[s219]

On the L series, the 3-pt has to always the last valve in the lineup in the sense that it's downstream of the "final return" port on the main hydraulic block under the right footboard. Though I suppose you could cap that port off if you created another return path for hydraulic flow. But all the factory components, whether front loader, backhoe, or rear remotes, assume use of that port as the final return, making the internal 3-pt valve the last destination for flow before going to the tank.

Note that the factory rear remote kit attaches to the side of the transmission case and uses a hole in the transmission case as a return path for its implement flows, while also having a external port to continue the PB loop. If there is a backhoe, that is next in line for PB, and then flow runs from backhoe to the final return port on the main block. If no backhoe, the PB loop from the rear remotes runs to the final return on the main block directly.

The factory backhoe does route flow back to the final return on the main block under the seat where it sends flow to the 3-pt. So technically you should be able to actuate the 3-pt while a backhoe is attached, even though the arms aren't there.

I think the implicit assumption, in the case of the L series, is that the 3-pt is always last in the loop since it's downstream of the final return port on the main block, and internal to the transmission case. You would need to get creative to bypass the 3-pt and drill a whole new return port if not using the main block's final return port.

 

[Chilly807]

You would need to get creative to bypass the 3-pt and drill a whole new return port if not using the main block's final return port.

The remote install Steve in MT did on his L3400 cut into the steel line from the hydraulic junction block to the 3-point valve for the pressure side of the circuit. The PB port on his remote valve then goes to the same steel line he cut into to get the pressure feed (but on the 3-point side). His return goes into the covered port on the left side of the transmission case.

Very neat setup, I was considering reworking mine to mirror his job. The part I liked was there were no long hoses and the valve position is ideal near your right hand.

I used the PB line from the loader valve to the junction block for my high pressure source. Instead of going to the block then into a steel line up to the 3-point valve, the pb hose now goes to the "in" port on my remote valve, and my remote PB feed goes back to the junction block then up to the 3-point valve via the steel line. My remote valve return port is teed into the main "tank" return under the floorboard.

I'm glad I saw this thread, it rekindled my desire to make mine as simple and neat as possible. I can see a re-work job coming this summer..

Most of the confusion in this part of the thread stems from one of us (I'll eat this one ) referring to "return" and "PB" in terms that were less than clear. The two are very different, "PB" having the capability of full system pressure if needed, and the "return" should be low pressure, under 500 psi as JJ mentioned.

 

[MtnViewRanch]

The remote install Steve in MT did on his L3400 cut into the steel line from the hydraulic junction block to the 3-point valve for the pressure side of the circuit. The PB port on his remote valve then goes to the same steel line he cut into to get the pressure feed (but on the 3-point side). Very neat setup, I was considering reworking mine to mirror his job. The part I liked was there were no long hoses and the valve position is ideal near your right hand.
I used the PB line from the loader valve to the junction block for mine. Instead of going to the block then up to the 3-point valve, the pb hose now goes to the "in" port on my remote valve. My remote valve return port is teed into the main "tank" return under the floorboard. His goes into the covered port on the left side of the transmission case.


I'm glad I saw this thread, it rekindled my desire to make mine as simple and neat as possible. I can see a re-work job coming this summer..

Would this take the return filter out of the system??

 

[Chilly807]

To the best of my knowledge, there is no return filter. Only hydraulic filter is on the suction side of the pump.

 

[J_J]

Yep, both the L3400 hydro and gear tractors only have the suction filters.

 

[MtnViewRanch]

Good to know, thanks you guys. :thumbsup:

 

[Dieselrider]

Okay, I've been looking at the lines on my tractor.m The line the feeds the backhoe is from the PB port on the bucket valve. When the BH is not on the machine, the return line is connected directly into the pressure line which allows fluid to flow right back to the box under the floor board.

So, if I then ran that pressure line to the input of the valve I mount, then from the PB fitting on that valve run a line down to where it could then be used by the BH when connected, correct? Now the return line of the BH could be plugged into that line when the BH is not mounted.

Okay, the only other question I have then is where would I run the return line from the rear remote/ remotes (depending if I install one or two? They would come back to the valve but where from the valve? Thanks

 

[J_J]

The PB line from the FEL valve going to the hyd block, remove it and connect it to your new valve IN port

The remote PB will now feed the BH or go to the hyd blk for the 3pt.

The BH return will go to tank.

If your BH has three hoses, there are other options.

 

[Dieselrider]

The PB line from the FEL valve going to the hyd block, remove it and connect it to your new valve IN port

The remote PB will now feed the BH or go to the hyd blk for the 3pt.

The BH return will go to tank.

If your BH has three hoses, there are other options.

I am not sure what you mean by "the BH return will go to the tank". What tank?

Perhaps I am not being clear. The BH has two lines and it is a BH77 model from Kubota for this tractor.

Are you talking about some other way to dump the return oil into the tranny of the tractor?

Can't I just T into the return line going into the auxiliary block under the step?

 

[J_J]

Reservoir actually. Your hyd tank.

Sure , you can run the OUT/return into a return line if convenient.

 

[Dieselrider]

Reservoir actually. Your hyd tank.

Sure , you can run the OUT/return into a return line if convenient.

Where else would you run it?

 

[J_J]

Directly into the hyd fill cap using an adapter.

 

[Dieselrider]

Directly into the hyd fill cap using an adapter.

Thank you. That may be more convenient than having to tee into the return line. Do I get the adapter directly from Kubota or is there another source? Thanks

 

[J_J]

Make your own.

 

[Dieselrider]

I would definitely look at that option.

 

[Chilly807]

The stock configuration for your tractor with loader and no hoe is the PB port on the loader valve feeds the 3 point valve via the hyd. junction block under the right floorboard.

View attachment 419231

In your picture, is the hose with the yellow arrow the feed from the loader valve PB port to the backhoe? The blue arrow points to the backhoe return hose? If that's correct, then the backhoe return goes to the 3 point valve unless there's something else added that I can't see. The white arrow indicates the tank hose I teed into for the "tank" port on my remote valve.

I'd agree with S219's assessment of the project, which was to insert the new remote valve in the system between the loader valve and backhoe. PB from loader valve goes to inlet port of new valve, PB port (with adapter fitting if needed) from new valve goes to backhoe inlet hose. Tank port on new valve goes to a tee fitting on your junction block to route the return oil back to tank. Work ports go to the new remote quick connects. You'll have full use of the rear remote connection at all times, plus either the 3 point or the backhoe.

If you find you're getting confused with all the different options/opinions, your best bet is to visit your dealer and tell them what you want to do. They know your tractor better than all of us combined, it's the business they're in. Their advice should be sound, and it covers your azz in case of a warranty issue as well. In fact, if you do decide to go ahead with our advice I'd strongly suggest you run it past them first. They'll either agree or tell you it's a good thing you decided to double check first.

 

[J_J]

Some of you guys are messing up the sequence of how the hoses are run and which connection should be used.

The pump feeds the hyd blk.

Top right port goes to loader IN port.

Loader PB comes back to the left port, and feeds the 3pt.

Bottom right port is tank port, and can be teed.

To add a remote valve, remove the left hose on hyd blk and connect it to the IN port of the remote valve, the remote PB will feed the BH if installed . Plug the left hyd port if not using the 3pt. If the BH has a PB port, that hose will go to the left port to the hyd blk for the 3pt.

If no BH, the remote valve PB will connect to the left port on the hyd blk for the 3pt.

The 3pt is not used with a frame mounted BH.

So now, the BH is installed.

The remote valve PB will now feed the BH IN port and the OUT port of a two hose BH valve will go to tank/reservoir.

A three hose BH is different in that you can feed the hyd blk left port with the BH PB line

If you have a two hose BH valve and it is 3pt mounted, you need a supply for the 3pt.

You are using the supply for the BH, and the return has to go to tank.

What you have to do is to split the supply flow and feed the BH or the 3pt, and that can be done with the valve I posted above.

I don't see any other way to cheat the system.

If you go back and read my post they are usually correct. I spend a lot of time looking up data, and making sure things are right.

If you catch me wrong, just say so. I don't mind at all.

 

[Chilly807]

A friend of mine told me today he doesn't waste his time giving advice here. I think he's right.

 

[s219]

I don't see any other way to cheat the system.

If you go back and read my post they are usually correct. I spend a lot of time looking up data, and making sure things are right.

If you catch me wrong, just say so. I don't mind at all.

You are definitely correct, but I don't think it has to be done this way. I would put the remote valves after the loader and before the backhoe, and still route the backhoe output back to feed the 3-pt. This is exactly how the factory remote kit is installed on a machine with a backhoe (or another way to look at it, this is the way I would be installing a backhoe on my machine that already has rear remotes). It doesn't disable the 3-pt, so you can still use it when the backhoe is off the machine and the arms are reinstalled. And there's no need to make up a new return line/port into the fill cap or tee into anything.

Though the factory rear remotes bolt onto the side of the transmission case and make use of the return port there (it gets uncovered before the valve blocks bolt on), there's no reason a third-party valve setup couldn't also make use of that return port. Would be very simple to fab up a block that bolts on at that point, or even to weld a fitting to the blank cover plate and just use that.

 

[J_J]

You are definitely correct, but I don't think it has to be done this way. I would put the remote valves after the loader and before the backhoe, and still route the backhoe output back to feed the 3-pt. This is exactly how the factory remote kit is installed on a machine with a backhoe (or another way to look at it, this is the way I would be installing a backhoe on my machine that already has rear remotes). It doesn't disable the 3-pt, so you can still use it when the backhoe is off the machine and the arms are reinstalled. And there's no need to make up a new return line/port into the fill cap or tee into anything.

Though the factory rear remotes bolt onto the side of the transmission case and make use of the return port there (it gets uncovered before the valve blocks bolt on), there's no reason a third-party valve setup couldn't also make use of that return port. Would be very simple to fab up a block that bolts on at that point, or even to weld a fitting to the blank cover plate and just use that.

How many times do I have to repeat this.

You should not run any OUT hose into a high pressure path. It could damage your valve.

If you run the two hose BH valve OUT hose correctly, it will bypass the 3pt. You usually don't need the 3pt when using BH