4430 high pressure leak to return
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Thread: 4430 high pressure leak to return

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    4430 high pressure leak to return

    trying to diagnose hydraulic heating issue with tractor as per tech manual diagnostic procedures. says I have a high pressure leak to return and to fix steering . can a person remove hose from steering valve return and measure separate from hose that runs from metering pump return line to return circuit below cab. At present I am getting a quart a minute. Trying to prove steering valve verses metering pump fault.

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    flyweight's Avatar
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    Any faulty high pressure component can cause a high pressure leak to return. How did the technical manual lead you to the steering?
    Michael

    2019 JD Z540R, 54" cutting deck w/MulchControl™
    1984 JD 750 Tractor
    1971 JD 15 Chainsaw, ← hasn't run since ~1975

    Also have a bunch of other useless stuff.










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    The John deere technical manual has a step by step procedure to test parts of the system and depending upon test results it gives areas to look at and fix . It is correct as I have to much oil coming from the steering return line . But I wanted to know if someone knew how to fault either of the two components of the steering system, metering pump or steering valve.

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    Welcome to GTT
    A laser thermometer is a good tool to utilize to find component contributing to an internal high pressure leak. I think hyd steering valve would be a more likely candidate for internal leak than metering pump.
    Last edited by Tx Jim; 09-07-2018 at 07:49 AM.
    Zebrafive likes this.

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    flyweight's Avatar
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    Quote Originally Posted by Lynn View Post
    The John Deere technical manual has a step by step procedure to test parts of the system and depending upon test results it gives areas to look at and fix . It is correct as I have to much oil coming from the steering return line . But I wanted to know if someone knew how to fault either of the two components of the steering system, metering pump or steering valve.
    So, your tractor must be S/N 027635 and above(steering metering pump with hydraulic steering valve).

    I agree with TxJim.
    Last edited by flyweight; 09-07-2018 at 05:24 PM.
    Michael

    2019 JD Z540R, 54" cutting deck w/MulchControl™
    1984 JD 750 Tractor
    1971 JD 15 Chainsaw, ← hasn't run since ~1975

    Also have a bunch of other useless stuff.










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