4430 Hydraulic Pump failure - Page 2
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Thread: 4430 Hydraulic Pump failure

  1. Top | #11

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    having same issues, with my 4430

    I an educating myself on my 4430 issues, this seems a lot like mine. what did you ever figure out?
    where can I find more info on hyd testing?
    can someone repost the diagrams?

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  3. Top | #12

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    JD closed center systems are very complicated. My advice to you is acquire a JD 4430 tech manual & study it diligently.
    DRobinson likes this.

  4. Top | #13

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    Quote Originally Posted by Tx Jim View Post
    JD closed center systems are very complicated. My advice to you is acquire a JD 4430 tech manual & study it diligently.
    I couldn't agree with you more, I have been gathering gauges and o-ring fittings, building a hyd test kit, I had a JD 4430 service manual but it was a b/w copy, gray pressure line pics are not very helpful. that manual is now a door stop.
    just bought a new serv manual from deere. fixed several issues, figured out how to isolate a few things, building a pressure test chart, and when I get the numbers I intend to come pester you and the forum again, because I value your experience, and there is only one way to get that experience and that is hands on.
    DRobinson, BigJim55 and Tx Jim like this.

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