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.
Lavoy
John Deere 350 hydraulic system pressure relief valve o-rings sought
Re: John Deere 350 hydraulic system pressure relief valve o-rings sought
Parts and restoration for antique and late model John Deere crawlers.
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Re: John Deere 350 hydraulic system pressure relief valve o-rings sought
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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