1
Saturated separator element
Rotary screw
CheckDifferential pressure across separator > 8–12 PSI.
FixReplace separator element; verify ground strap installed.
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2
Scavenge line blocked
Rotary screw
CheckRemove scavenge orifice and check; flow test return line.
FixClean orifice and line; replace if cracked.
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3
Overfilled sump
Rotary screw
CheckSight glass at running level.
FixDrain to correct level.
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4
Wrong oil type / degraded oil
Rotary screw
CheckOil analysis: TAN, viscosity, particle count, water.
FixDrain, flush, refill with correct OEM spec.
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5
Min pressure valve failed open
Rotary screw
CheckDischarge pressure builds slowly; sump pressure equals line pressure.
FixRebuild MPV.
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6
Cracked separator vessel weld
criticalRotary screw
CheckVisual; oil weep at weld seam.
FixReplace separator vessel.
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Safety
Lockout/tagout before opening enclosures. Verify zero energy. Bleed system pressure before opening any pneumatic connection.