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Adding additional SCV's to JD 4720

16284 Views 27 Replies 5 Participants Last post by  Furu
I have searched the archives and find nothing that quite addresses my issue described below. Something similar on a JD 3720 mod but from the discussion it is plumbed much differently from the 4720.

I have a 2007 JD 4720 with power beyond and the standard dual SCV.
I want to add some additional SCV's. I know that I can put on the 3rd SCV kit (LVB25513) and the 4th and 5th SCV electric diverter kit (LVB26077) and get three rear SCV's out of the mod.

My question is with the power beyond has anyone put on a spooler valve on the power beyond hydraulics to get the extra control valves that way. They would have to be open valves similar to what is on the backhoe. If a bank of open hydraulic valves were plumbed into the output of the power beyond and returned the same way it seems that could be a viable method of gaining what I am looking for. It may not be viable economically or technically versus the JD kits but if doable would leave the front end SCV usable at the same time.

Any ideas or experience in this area.
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Where is the Backhoe return?

'First post, I've been out here learning from you guys for quite some time now... What a great resource!

OK, I am working on the same upgrade on a 2008 JD 4720. I'm installing the PB kit and using a Prince Wolverine WVS21BB5C1 2 spool valve with the PB adapter to achieve the 4th and 5th SCV functionality. I understand the serial nature of the PB circuit, the need for a low pressure return to a sump and the valve used is very clear on how it is plumbed. Everything has made sense to me up until I came across this post. I was confused about something you said in the quote below and was hoping someone could clarify.

Once the valve is mounted you will need to get two 1/2" hoses and the proper QD's to be able to plug it into the PB lines. You will NOT use the return port that the backhoe plugs into since that bypasses the 3PH, but rather the one that's used when you remove the backhoe. You should have one Male and one Female QD.
What are you referring to when you say not to plumb to the return port the backhoe uses? Is this the one just below the drivers right, rockshaft arm and part of the PB kit? I don't have a backhoe to reference and the above comment on the backhoe return makes me go hmmmmm...:unknown: These things are too expensive to risk screwing up when knowledgeable help is a question away!

If I'm OK using the transmission return port that's available after the PB installation, does anyone know what the standard is for the 3/8" QD? It doesn't mate to a spare 3/8" ag interchange QD I have and I'll need to know when I get hoses around. The QD is on the tractor miles from my house, so measuring with the calipers is a stretch.

Thanks for all the help!
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Thanks for clarifying!

Thanks for the clarification on the return - I was worried I had missed something big. My PB kit was shorted 2 fitings so I'm waiting for those and my bracket to mount the valve. A week or so and I'll have it buttoned up.

I'll post a pic or two when its "finished"... version 1.0 will have hoses. After I catch up on my stump grinding before the grass grows, I'd like to convert to hard lines. In the mean time, I have a great deal of work to do (mostly in the seat after the hydraulics are ready).

Thank you for the lead on the ISO designation for the return male QD. The QD's for the SCV's and PB are all 1/2", but the PB return is a 3/8" on the 4720.

I'll post more when I get things ready and a can provide a pic of the tractor hydraulics and a "before" pic of my once beautiful ash forest, now reduced to acres of ash stumps and firewood (the emerald ash borer is coming if it hasn't already gotten to you).

Thanks again! :thumbup1gif:
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Very interested...

When you get a chance/further into your project - Post a pic or two of your mounting/bracket solution. The plumbing is technical/academic, the creative aspect is in packaging and making the valves ergonomically functional. Since we have the same tractor, I'd love to see how you approach this.

Anyway, I followed this thread before I started my PB/SCV add-on so I'm very curious to see how you work out the details. Four valves poses some challenges to mount, even with the space available on the 4720 (lots of hoses/fittings and QD's!). It should be an awesome setup! :thumbup1gif:

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