I am seeing high Na on my oil analysis report for a hydraulic oil. What might cause this? It is not water cooled.

What other elements are you getting? It might be together with other minerals from dust? Water content? (sea water?)

This message has been edited. Last edited by: mr. Hughes,

What type of water is used in and around your Hyd. system ?
What type of product are you using in your proces ?

Sodium is generally from coolant additives but if its not a water cooled system like you've said then consider looking at what content is in the dust around your machine. Take 2 fresh samples and leave one open to the atmosphere for awhile, then send both off to your lab. This will give you information on what is typical of your environment your machine is in.

Is somebody washing down your machines, this could be getting in your reservoir?

Failing all this, could grease be coming into contact with your hydraulic fluid somewhere in your system?

Hope this helps.

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Originally posted by jreamer:
I am seeing high Na on my oil analysis report for a hydraulic oil. What might cause this? It is not water cooled.

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Acid removal filters made from Alumina will shed sodium into Phosphate ester hydraulic fluids
PTD

I would suggest sending a sample of your new, unused oil to the lab for analysis. This might show up as part of the oil additive package. Just a thought.