Bleeding Hydraulic Cylinders - Best Way To Go About it?
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Thread: Bleeding Hydraulic Cylinders - Best Way To Go About it?

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    Boonie's Avatar
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    Bleeding Hydraulic Cylinders - Best Way To Go About it?

    I'm in need of some assistance, as the task I've never done before.
    I'm mounting a front 4-way plow from the JD140/318 era. Type "F" fluid was the bloodline previously.
    The old fluid needs to be bled out, then purge fresh (compatible with my x739) fluids through the two hydraulic cylinders.

    What's the best (most effective) way to go about what I need to do?
    Is it as simple as depressing both male ends and letting the fluid drain?
    Last edited by Boonie; 06-18-2018 at 12:47 PM.
    2018 X739 w/54HC MMM & Mulch Kit
    54" 4-Way Plow w/Custom Mount
    Ruegg 3PH and a gaggle of implements.

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    Captain Hook Kennyd's Avatar
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    Take the two QD nipples off and place the hose ends in a large bucket, then manually cycle the cylinder to push the old fluid out of the cylinder and let the hoses drain. It’s messy, but it works.
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    Kenny

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    Boonie's Avatar
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    Copy that.
    Thanks for the lead!
    2018 X739 w/54HC MMM & Mulch Kit
    54" 4-Way Plow w/Custom Mount
    Ruegg 3PH and a gaggle of implements.

    TSC = The Village of Idiots

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    1010's Avatar
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    To get ahead of the curve, you might want to go ahead get them repacked while you have them off. And have the ram cleaned up if any rust is there.
    Any local HYD shop can do this, or you could do the new o-ring seals in the cylinders, JD will have them or a HYD shop can get them.

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    Quote Originally Posted by Kennyd View Post
    Take the two QD nipples off and place the hose ends in a large bucket, then manually cycle the cylinder to push the old fluid out of the cylinder and let the hoses drain. It’s messy, but it works.
    I've even taken it one step further. Once the old fluid is drained out, dump the old fluid and put a little bit of new fluid in the bucket and then cycle the ram back and forth. That will pull in new fluid and further rinse out any old that is in there. In the process you can see if there is any dirt flushed out of the cylinder.
    1010 and Boonie like this.
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    @1010
    The cylinders are good to go. No leaks, no rust.

    Quote Originally Posted by jgayman View Post
    I've even taken it one step further. Once the old fluid is drained out, dump the old fluid and put a little bit of new fluid in the bucket and then cycle the ram back and forth. That will pull in new fluid and further rinse out any old that is in there. In the process you can see if there is any dirt flushed out of the cylinder.
    That was my intentions. My main concerns are getting them flushed real good and purged of air before connecting into my unit.

    Thanks

    Thanks everyone that responded. I appreciate it!!
    1010 likes this.
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    Ruegg 3PH and a gaggle of implements.

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    Quote Originally Posted by Boonie View Post
    @1010
    The cylinders are good to go. No leaks, no rust.



    That was my intentions. My main concerns are getting them flushed real good and purged of air before connecting into my unit.

    Thanks

    Thanks everyone that responded. I appreciate it!!
    I don't think you have to worry too much about the air. That will clear up just by cycling the hydraulics a few times once connected.
    Jim Timber and Auguste like this.
    2012 2720 -- 200CX Loader -- 54" Quick Attach Snow Blower -- Frontier LR5060 Rake -- Land Pride RB1660 Blade (Hydraulic Angle) -- Artillian 42" Forks -- Ken's Bolt on Grab Hooks -- Fit Rite Hydraulic top-link -- 2013 X500 for mowing duties

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