BX25 Remote Valve Project

[CHDinCT]

CHDinCT you are to be complimented for starting this excellent thread. My compliments also extend to other members for their valuable inputs.

I would like to install a remote valve on my BX25; however, I am having difficulty figuring out how those hydraulic lines attached to the backhoe actually work. Might some members be able to shed a bit of light on a few questions please? For example:

1) Is there a diagram available that illustrates how the oil flows through the three hydraulic lines between the BX25 and the BT601?
2) Might there be a diagram that shows to which ports on the remote valve the above hydraulic lines should be connected to?
3) Finally, is there a diagram showing which ports on the remote valve would be connected to two hydraulic cylinders on a new attachment (other than the BT601)?

Ip333, just saw your post with questions. I'll see if I can help you out some. While there may be a hydraulic circuit diagram in the BX25 Work Shop Manual (available for purchase from any dealer), I didn't have one but really didn't need it. I can tell you that the three connections for the backhoe consist of a pressure in line (which is the male ended line that when un-hooked extends about a foot out from the tractor), a power beyond line which is the line that plugs into the female quick connect on the tractor just to the right of the top link bracket, and finally the return-to-tank line which is the line that has a female end and plugs into the male QC just to the left of the top link bracket.

When the backhoe is connected to the tractor, pressure flows from the pressure in line through the backhoe valve and out to the power beyond line so as to feed pressure to downstream vales on the BX. This is the case when no functions on the backhoe are being used. As soon as you use any BH functions, pressure is diverted via the BH valve to whatever cylinder is in use and low pressure oil on opposite side of the cylinder is feed through the BH valve back to the HST tank via the return-to-tank line.

In my set up, I looked for a two spool valve with a power beyond function and in essence put it in place of the BH valve (conceptually). I hooked up the pressure in from the tractor to the pressure in port on the new vavle, the power beyond port on the new valve to the power beyond port on the tractor, and the tank return line on the valve to the tank return port on the tractor. When set up this way, pressure is fed through the new valve and down stream to other functions whenever the valve is not in use. When in use, the valve re-directs pressure to one of the two pairs of ports and then back to the HST tank via the tank return line on the new valve. To use the backhoe via the new valve, I used one set of ports on the valve to feed the pressure in and power beyond hoses on the BH and then hooked up the tank return line on the backhoe to the tank return line from the new valve via a "T" fitting.

Well, this may be hard to explain via works, but if you start with knowing which connections at the rear of your BX are for pressure in, power beyond and tank return (as I laid out above), you'll know how to hook them up to your new auxilliary valve since the new valve's ports will be labeled when you get it. If you attempt this project, start a new thread (my recommendation) and ask lots of questions and you'll get plenty of help from the hyraulic experts on TBN, which assuredly, I'm not one of. So I guess I could say, if I can do it, so can you. Hope some/any of this helps.

 

[CHDinCT]

Ip333, just realized I didn't address Q3 in your post. I guess it could depend on what implement you're powering via the aux valve, but as far as any two-way cylinder is concerned, it doesn't matter which port on the valve is connected to which port on the cylinder. Since the spool will operate in two directions, moving the spool in one direction will move the cylinder one way and vice-versa for the other spool position. If you don't like which position on the spool corresponds to which way the cylinder moves, just reverse the lines. Hope that helps.

 

[CORamos]

Chris,

This was very helpful. I've been wondering what each of the lines actually does.

Hopefully I'll get around to attaching my grapple soon.

 

[CompactTractorFan]

Also came in handy when I hooked up my carry all to move some firewood (hat tip to Wrooster and CTF for the carryall idea). Anyway, here's a few pic's of the top link fully extended and retracted.

:thumbsup:

 

[CHDinCT]

Sorry to resurrect this old thread, but I've had some PMs and posts including CORamos above on which port on the back of the BX25/25D/24 is for pressure in, power beyond and tank return so I thought I'd add this pic of mine with notes and arrows showing which line does what. This should help anyone that's looking to add an auxiliary valve using the existing BH power beyond loop.

Also, if it matters to anyone, I found that with the auxiliary valve hooked up and the detent spool active (I use a detent spool to send continuous flow/pressure to the BH when I run it off of the aux valve), that there is no pressure to the FEL valve or 3PH. So, that must mean that the BH pressure in is the first valve in series in the BX hydraulic system. I don't know if the FEL is next or the 3PH, but if I had to quess, I'd guess the FEL is next/second. Hope any of this is helpful to other hydraulic mod'ers out there.

 

[Ludovik]

Hello I have a question

I have a bx25d. I bought a prince 2 spool valve for snowblower trow control. I know that i need to run one hose from power beyon loop into valve intake, but where i'm confused is how to conect the rest of setup to be good. If i connect the exhaust port to the other end of power beyond loop will this be ok???

Help!!!
Sorry for my bad english, i usually speak french!

 

[samofsweden]

samofsweden, nice set up. Tripple remotes I see. Did you plumb yours into the backhoe ports?

Hi. I hoped you would see my thread, but there where only a few pics...
Sorry for that, yes I did plum it into the backhoe ports. You need to be just a little careful if you do as I did, you have to plum it so the oil can circle then using iit without BH.
Good luck!
/Sam

 

[samofsweden]

Nice job, Chris; I think they can use you at the sub base.
Sam's job looked like the factory did it.

Thanks Astanton!!!

 

[samofsweden]

samofsweden, nice set up. Tripple remotes I see. Did you plumb yours into the backhoe ports?

Posting a pic on my setup. You have to disconcet this setup when inuse of the BH, and reconnect when the BH is off. Its a very simple pluming.

 

[Ludovik]

Thanks alot everybody!! Works perfect!!!! Now its a whole new toy with a 2-spool valve!!!

 

[Ludovik]

Sorry to bother you with this but i have a little problem...
I did use this spool: 2 SPOOL 8 GPM PRINCE MB21BB5C1 DA VALVE
And those coupler: 1/4" QUICK COUPLER S10-2

On my bx25.

There is a major leak when i do use spool valve. The leak is between the male and female end of coupler. Does anyone had this problem???

 

[CHDinCT]

Sorry to bother you with this but i have a little problem...
I did use this spool: 2 SPOOL 8 GPM PRINCE MB21BB5C1 DA VALVE
And those coupler: 1/4" QUICK COUPLER S10-2

On my bx25.

There is a major leak when i do use spool valve. The leak is between the male and female end of coupler. Does anyone had this problem???

Ludovik, sorry I never saw your question posted here. Did you get the leak fixed? Sounds like either one of your fittings isn't tight or a defective quick connect. Not unusual to have a leak here or there on first firing of you hydraulics, but like I said, it's usually something not tight enough. I know some frown on teflon tape, but I use it on NPT fittings and am just careful to keep the tape back from the first or second row of threads. Any fitting with an O-ring seal shouldn't need tape, just a good snug tightening. Oh, that's another possibility, defective O-ring. Hope you got it fixed up.

 

[2fast916]

CHDinCT,

Thanks for all the info that's been pulled together by this thread.

Hopefully I read all the posts fully but, since you had the Kubota set-up on your previous tractor, was there anyway to retrofit the levers in the fender / seat area opening? I am not sure if that is the interference issue you described with the Kubota kit or not. That would be really slick, if you could retain the Kubota levers...was looking forward to that set-up.

 

[CHDinCT]

CHDinCT,

Thanks for all the info that's been pulled together by this thread.

Hopefully I read all the posts fully but, since you had the Kubota set-up on your previous tractor, was there anyway to retrofit the levers in the fender / seat area opening? I am not sure if that is the interference issue you described with the Kubota kit or not. That would be really slick, if you could retain the Kubota levers...was looking forward to that set-up.

The problem with using the non-backhoe remote valve set up on a BX24 or BX25 is that the valve itself that Kubota supplies, bolts to the side of the transmission and the levers then extent up through that blank lever slot. The valve can't be mounted to the transmission on a BX24/25 because the backhoe subframe is in the way. I suppose if you're a good enough fabricator, you could mount the valve under the fender somehow and use flexible hoses to make all the connections versus the steel pipes the kit comes with. Then, you might be able to have the levers come up through the blank lever slot after making new bends in the levers themselves. Never really though about trying that approach. If you had the Kubota valve in hand, you could play around with where it might go under the fender - not sure there's enough room with the BH frame. The other consideration is that the Kubota rear remotes mount inside the right, vertical ROPs tube and it might interfere with rotating the seat for backhoe use. Of course, you could move those too, but then you're buying a complete Kubota dual rear remote kit and throwing everything out except the valve, quick connects and levers. Probably cost a couple hundred more in parts for hoses, fittings, brackets, etc. But, I agree that would be cool if it could be done. Maybe if someone like 4Shorts did the mod, you could follow what he would do. Hint, hint for Paul Shorts (if he's still on TBN).

 

[2fast916]

Thanks again for all the great info! Let me ponder this one a bit...I might buy the kit this summer and see what I can figure out. The way I understand it, you can't buy anything but the kit from Kubota?...meaning I couldn't just order the valve if I wanted to?

 

[CHDinCT]

Thanks again for all the great info! Let me ponder this one a bit...I might buy the kit this summer and see what I can figure out. The way I understand it, you can't buy anything but the kit from Kubota?...meaning I couldn't just order the valve if I wanted to?

Hmmm. Guess you could order just the valve if you had the part number which i may have at home but i thought i read in one of these threads Kubota wants $800 for just the valve - a little foggy on where i saw that.

 

[2fast916]

Well that's certainly absurd, if true! No rush at all really but, if you come across the P/N, could you forward it along?

 

[CHDinCT]

Well that's certainly absurd, if true! No rush at all really but, if you come across the P/N, could you forward it along?

Just back home now, so will take a look soon. I think I kept the installation instructions which had a parts breakdown IIRC.

 

[CHDinCT]

Well that's certainly absurd, if true! No rush at all really but, if you come across the P/N, could you forward it along?

OK found my install manual and parts list. First off, the parts list is for the BX7326 Rear Aux. Kit. I think I saw in one of my earlier posts that Kubota changed the kit number for the 70 series tractors. No idea what changed or why as the BX25D is in all material respects the same as the BX25. Not sure which version you have. Anyway, the valve itself is listed as part YW305-0010-0. The levers which consist of two parts (identical pieces) and two plastic covers are:

• Lower lever - K2583-3731-0
• Upper Lever - K2563-3735-0
• Plastic Grips - K2563-3737-0

Again, you would need two of each if you want those on top of the valve itself.

 

[dannla]

Thank you for all this information. I am getting ready to add the hydraulic top link to my BX25 when I add a valve to operate the hydraulic scarifiers on the used Gearmore 54" box scraper I just picked up. I have good understanding of all the parts needed with the exception of the hydraulic top link itself. Can someone post a manufacturer and part number for a top link that they have used successfully on the BX25? If anyone has a manufacturer and part number of a cylinder they have used to add tilt function, that would be much appreciated as well. Thank you in advance!