4720 homemade 3rd function kit...issue
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Thread: 4720 homemade 3rd function kit...issue

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    Chris2002's Avatar
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    4720 homemade 3rd function kit...issue

    I made my own 4720 3rd function kit with the summit hyd. Valve. Works fine but with one issue! When I engage the electric operated scv my engine bogs down?Grapple operates just fine in both directions just have a drag on the engine. I ran 3/8" hoses from solenoid scv to front of tractor. I plumbed into pb circuit of my loader scv. Tractor Pump flows 12gpm, grapple I would assume doesn't need much flow 4--5gpm maby. Anyone else that has true 3rd funct kit tractor bog down when engaged? It almost seems like the pressure relief is opening when I operate it. Solenoid Valve factory relief setting is 2610 psi dunno the tractor setting....tractor data says operating psi is 2500?? Is this common with my set up? Steel line in the pic is the line I had to remove to plumb in valve. It comes from pb from loader scv to rockshaft (3point)
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    Last edited by Chris2002; 04-04-2019 at 07:41 AM.

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    Edit: My response related to a diverter system. I re-read you are using an SCV.
    Last edited by Old Machinist; 04-04-2019 at 07:40 AM.
    John Deere 4310 tractor, New Holland 575E backhoe, John Deere F725 mower

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    Captain Hook Kennyd's Avatar
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    Welcome to GTT,
    Your dumping a full 12 GPM into two small cylinders, I would expect it to bog down a bit, and the cylinders to move FAST.

    Can you link to what valve you used?
    Kenny

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    Chris2002's Avatar
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    Chris2002's Avatar
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    Off topic but Im trying to change my user name from email to something else...errrrr cant figure it out

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    Captain Hook Kennyd's Avatar
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    Remember when using a valve like that, it's ON or OFF. When activated you are directing 100% of the flow to the new circuit.

    Are you positive you have it hooked up in the correct direction?
    Kenny

    -John Deere 3720 Deluxe Cab TLB
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    Captain Hook Kennyd's Avatar
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    Quote Originally Posted by [email protected] View Post
    Off topic but Im trying to change my user name from email to something else...errrrr cant figure it out

    You can't...but I can do it for you. Please send me the info in a Private Message.
    Kenny

    -John Deere 3720 Deluxe Cab TLB
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    -John Deere 455 w/60" MMM


    Bolt on Grab Hooks and other cool stuff are now for sale!!

    Visit our YouTube Channel

    My Equipment:
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    Artillian 3K Forks, Grapple, Front-Hoe Bucket
    John Deere 455, 60" MMM

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    Chris2002's Avatar
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    Yes, loader valve pb to "P" on solenoid valve. "T" from solenoid valve back to rockshaft which completes my open center circuit. Everything operates as it should 3point, grapple. But when I engage EL scv it bogs down a bit...

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    Chris2002's Avatar
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    I'm getting a new valve tomorrow as the one I recieved was either faulty or has the wrong spool in it. One work port looses pressure. I can still operate grapple tho. I guess my thought is when i operate my loader scv it doesn't bog down at all unless I get to relief pressure..I'm thinking why is grapp. Bogging down. 12gpm thru 3/8" hose to small cylinders with fair amount of pressure Im assuming. Im going to plumb in pressure gauge if it keeps it up and see qhats going on I dont want to stress my pump more than I should.

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    Captain Hook Kennyd's Avatar
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    Your loader valve is proportional, this is not.
    Kenny

    -John Deere 3720 Deluxe Cab TLB
    FEL, MMM, Artillian 42" Forks and Modular Grapple, I-Match, Ballast Box, Trac-Vac 854 (for sale) and lots of other STUFF.
    -John Deere 455 w/60" MMM


    Bolt on Grab Hooks and other cool stuff are now for sale!!

    Visit our YouTube Channel

    My Equipment:
    John Deere 3720 Deluxe Cab, 300cx FEL, 366 Front Blade, 59" Front Snowblower, Ballast Box
    Artillian 3K Forks, Grapple, Front-Hoe Bucket
    John Deere 455, 60" MMM

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