1
Rising iron and chrome — bearing or rotor wear
highRotary screw
CheckTrend the last three reports rather than reacting to one sample; correlate with vibration data.
FixSchedule an airend inspection; plan a rebuild before failure.
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2
Silicon high — dirt ingress past the intake filter
medCheckInspect the intake filter seal, housing gasket and any cracked inlet hose.
FixReplace the filter and repair the leak path; re-sample after 100 hours.
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3
Water content high
medRotary screw
CheckCheck for a milky sample, and confirm the machine reaches 180–200°F discharge in service.
FixFix the thermostatic valve or low-load running so the unit runs hot enough to drive off moisture; change the oil.
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4
Oxidation / TAN above limit
medCheckCompare TAN and viscosity with the new-oil baseline.
FixChange the oil now and shorten the interval; high temperatures accelerate oxidation.
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Safety
Lockout/tagout before opening enclosures. Verify zero energy. Bleed system pressure before opening any pneumatic connection.