JD 790 Spool Valve Install
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Thread: JD 790 Spool Valve Install

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    JD 790 Spool Valve Install

    I'm planning to add a TNT to my 790. I was able to get my hands on a BM18005 Power Beyond kit, so this is what I'm working with. Also If I can ever find a #7 backhoe I'll be set for that.

    As far as the spool valve, I'll be using one with the Power Beyond feature. The spool valve will be fed from the tractor PB "To Valve" coupler, the PB port on the valve will go to the "From Remote Valve" coupler and the spool valve output port will be returned to the case / tank.

    Does anyone have a clue as to where I can tie in the tank return from the valve output to this tractor? I'm not seeing a spot to tie into. Here is a pic of what I'm trying to do.

    Click image for larger version. 

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    Last edited by wsmitty; 11-28-2017 at 04:06 PM.
    2000 JD 790 w/70 loader and bolt on hooks. 5' King Kutter rotary mower, 5' EA box blade, 6' King Kutter rear blade, 6' Countyline landscape Rake, Countyline middle buster, Leinbach 7300 PHD, 5' VL EGF155 flail mower

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    Captain Hook Kennyd's Avatar
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    I searched JDParts and TBN, the best I can come up with isthe port with the #6 plug in it, but since you have SCV I'm guessing this has a pipe hooked to it. You could replace the pipe with a hose and add in a Tee there. I believe this is the tank line for the SCV valve.

    Click image for larger version. 

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    Another option might be to make a adapter for the fill plug on the rockshaft case (#38), or even drill/tap the case next to it for a return line.

    Click image for larger version. 

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    Ray_PA likes this.
    Kenny

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    I do have the SCV due to having the loader. It does look like #6 has a pipe with a banjo fitting going to it. I've seen the "through the fill cap" version somewhere online. Not a big fan of that idea, but even having to remove it to add oil might be less of a hassle than trying to T into that other line.
    2000 JD 790 w/70 loader and bolt on hooks. 5' King Kutter rotary mower, 5' EA box blade, 6' King Kutter rear blade, 6' Countyline landscape Rake, Countyline middle buster, Leinbach 7300 PHD, 5' VL EGF155 flail mower

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    I verified with the dwg from JD parts. The #6 plug is only in place w/o SCV. I'll have to take a closer look but I'm wondering if I can plumb to the pipe plug at the strainer (item#10 in first dwg.).

    Not sure if that's a good idea. I did find the pic of someone using the fill cap. Not the most elegant solution, but it would work. I'd just have to stand the fitting straight up to be able to remove it to add oil.

    Pretty sure the bracket is too close to try it the way this guy did.

    Click image for larger version. 

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    2000 JD 790 w/70 loader and bolt on hooks. 5' King Kutter rotary mower, 5' EA box blade, 6' King Kutter rear blade, 6' Countyline landscape Rake, Countyline middle buster, Leinbach 7300 PHD, 5' VL EGF155 flail mower

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