Mixing incompatible fluids can varnish, sludge and take out an airend.
1
PAO / PAG / diester and mineral fluids mixed
highCheckDraw a sample into a clear bottle: look for cloudiness, separation, gelling or a sudden colour change.
FixDrain completely, replace the filter and separator, flush per OEM procedure and refill with the specified fluid.
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2
Food-grade fluid topped up with standard fluid
highCheckReview the service log and drum labels; confirm the unit's certification requirement.
FixFull drain, flush and refill with H1 food-grade fluid; document the incident for audit.
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3
Wrong viscosity grade for the ambient
medCheckCompare the fluid grade to the OEM chart for the site's temperature range.
FixChange to the correct grade; expect high-temp trips or hard starts until it is corrected.
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4
Varnish already formed in the cooler and lines
medCheckInspect the sight glass, cooler inlet and filter media for brown lacquer deposits.
FixUse an OEM-approved flush, replace the filter twice on the short interval, and shorten the next change interval.
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Safety
Lockout/tagout before opening enclosures. Verify zero energy. Bleed system pressure before opening any pneumatic connection.