Oil appears past the package separator, in the receiver tank or piping.
1
Excessive sump oil level causing over-carryover under load
Rotary screw
CheckVerify sight glass level while running under full load, not just at rest.
FixCorrect oil level to OEM running spec.
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2
Receiver tank never drained, accumulating an oil/water layer
CheckCheck tank drain for standing liquid layer.
FixDrain tank fully; verify automatic drain is functioning; consider tank interior inspection for corrosion.
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3
Piping installed with reverse pitch trapping oil/condensate
CheckVerify piping slopes toward drain points per installation best practice (~1% grade).
FixRe-pipe with correct slope and low-point drains.
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4
Separator element bypassing due to damaged gasket/seal
Rotary screw
CheckInspect element gasket and housing seal surfaces for damage on removal.
FixReplace gasket/seal; ensure correct torque on housing on reassembly per OEM spec.
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Safety
Lockout/tagout before opening enclosures. Verify zero energy. Bleed system pressure before opening any pneumatic connection.