Adding a 3-spool valve to an '86 316
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    Adding a 3-spool valve to an '86 316

    Question for all you folks. I have a 3-spool valve from a 140 H-3. Thinking about adding it to the existing hydraulics on my 316. My thought is to undo the return off the existing valve and run that to the 'in' port on the 3-spool. Then run that return back in place of the existing return. Would this work or would I be better off to put a tee into the existing lines. No way to just replace the single spool with this one as the steering is in the way for the handle linkage. More or less make an H-4 with it. Just thoughts at the moment.


    Edit: title should read '86 316
    Last edited by KennyP; 11-28-2019 at 10:11 AM.
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    Captain Hook Kennyd's Avatar
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    Thread title fixed. Sorry I can't help with you're question.
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    If one tee's a control valve into an open center hyd system such as a JD316 it will not function as designed. I think you can add the 3 spool valve as you stated after the original valve & hyd's will function correctly
    Last edited by Tx Jim; 11-28-2019 at 01:30 PM.
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    Quote Originally Posted by Tx Jim View Post
    If one tee's a control valve into an open center hyd system such as a JD316 it will not function as designed. I think you can add the 3 spool valve as you stated after the original valve & hyd's will function correctly
    This valve should be open center also since it came from a 140.
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    Quote Originally Posted by KennyP View Post
    This valve should be open center also since it came from a 140.
    I agree hyd valve from JD 140 will be open center.
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    Cool, Then I would have and H4.

    Now to figure out where to put it and make some handles since I don't have the 140 ones.
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    Quote Originally Posted by KennyP View Post
    Cool, Then I would have and H4.

    Now to figure out where to put it and make some handles since I don't have the 140 ones.
    I added the single spool valve from a 316 to my 318 in the manner you mentioned (return from the H2 valve into the added H1, return from the H1 to the OE return line.)
    I mounted the H1 at a 90 degree angle to the OE valve, and got the 3 handle set from a 420 ...turning one of the inside levers 90 degrees to operate the new valve.
    (Interestingly... the short inside lever had a key slot to do this.)
    It worked Awesome.

    While I did not have any adverse affects, and am sure it was safe... Some concern doing this with "just any system on just any tractor" is to be sure the return side of the original valve can stand the pressure.
    If the outlet port of the casting is designed for the lower pressure of a "'tank return" and not "power beyond" there could be trouble.
    That said.. the 950 psi max pressure the 31X tractors should be set to is unlikely to be an issue in most valve castings.

    I have no pics I can find.. and sold the tractor or I'd post up.. sorry.
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    I don't know if these will help, but this is straight from the 316, 318, and 420 tech manual. The later 318's had a 3-spool option, same system the 420 has.
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    It will work just fine as long as it is open center and in series with the original open center valve. I did just about what you are considering by adding a 2 spool valve downstream from the 3 spool valve on my 400 to give an H5. Had to be creative about finding space to put it and ended up with it under the fender. I just happened on a 2 spool valve (with a handy handle configuration) from a Toro sand trap conditioner on Ebay. I separated the rockshaft (3PH) and the deck lift with the 2 spool and left the 3 spool available for a loader and other options.
    Attached Thumbnails Attached Thumbnails 2spool1.jpg   2spool3.JPG  
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    That is SWEET!!!!!!
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