Any thread sealant required on these fittings?
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Thread: Any thread sealant required on these fittings?

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    stevepsd's Avatar
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    Any thread sealant required on these fittings?

    Getting prepared to install new hydraulics to my 4R tractor and wanted to know if any thread sealant is recommended on the fittings shown below or is the o-ring sufficient? There a quite a few of these types of fitting in the 3rd SCV and Power Beyond kits from JD.

    I believe they are referred to as SAE Straight Thread O-Ring (O-Ring Boss) SAE J1926-1 ??

    If so, would Loctite 565 LOCTITEĀ® 565ā„¢ Thread Sealant Controlled Strength - Henkel or a paste PTFE thread sealant like RectorSeal T Plus 2 https://www.rectorseal.com/rectorseal-t-plus-2/ be acceptable?
    Attached Thumbnails Attached Thumbnails 20180208_101719.jpg   20180208_101728.jpg  
    Last edited by stevepsd; 02-08-2018 at 11:43 AM.
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    Senior GTT Super Slacker Gizmo2's Avatar
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    No, IMO.
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    Keith

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    Quote Originally Posted by Gizmo2 View Post
    No, IMO.
    ️X2. The o-ring should be all you need.
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    Senior GTT Super Slacker Gizmo2's Avatar
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    Keith

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    No but: smear some oil on the o-ring before installing.
    Kenny

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    stevepsd's Avatar
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    Quote Originally Posted by Kennyd View Post
    No but: smear some oil on the o-ring before installing.
    Good call on that.
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    PTFE on threads do not act as a sealant,,
    the Teflon simply allows you to turn the fitting together more than if tightened dry.

    There is a negative to Teflon,,,
    since it allows the threads to move easier,, the fitting can also loosen easier,,,
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    I agree. No sealant is needed and those don't need to be super tight either. We use them at work all the time. The O-ring does the work.
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    Pipe sealant with teflon is one thing...and not needed on this application as the o-ring does the sealing...but NEVER, and I mean NEVER, use teflon tape on any fitting or component in a hydraulic system. "Bits" of teflon can break off & clog and even stop valve spools and pumps from operating. Most modern tapered hydraulic fitting are NPTF and only require a lubricant, not a sealant, on the threads to tighten & seal properly.
    Last edited by rwmeyer; 02-09-2018 at 04:14 AM.
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