John Deere 350 hydraulic system pressure relief valve o-rings sought

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Lavoy
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Re: John Deere 350 hydraulic system pressure relief valve o-rings sought

Post by Lavoy » Sun Oct 19, 2025 7:33 pm

I have had pretty fair luck with Seafoam to get moisture out of hyd oil. Heat is also good, but you need the hyd oil hit for half an hour or so.
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Parts and restoration for antique and late model John Deere crawlers.
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briancady413
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Re: John Deere 350 hydraulic system pressure relief valve o-rings sought

Post by briancady413 » Mon Oct 20, 2025 4:17 pm

Lavoy, thanks for the tip - what's Seafoam? It turns out that this hydraulic oil had foamed, as it became clear after sitting some days.
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Stan Disbrow
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Re: John Deere 350 hydraulic system pressure relief valve o-rings sought

Post by Stan Disbrow » Tue Oct 21, 2025 8:20 am

Hi,

https://shop.advanceautoparts.com/p/sea ... gKTSfD_BwE

In other auto parts stores as well.

Stan
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