1
Saturated separator element
CheckDifferential pressure across separator > 8–12 PSI.
FixReplace separator element.
2
Scavenge line blocked
CheckRemove scavenge orifice and check.
FixClean orifice and line.
3
Overfilled sump
CheckSight glass at running level.
FixDrain to correct level.
4
Wrong oil type / degraded oil
CheckOil analysis.
FixDrain, flush, refill with correct OEM spec.
5
Min pressure valve failed open
CheckDischarge pressure builds slowly.
FixRebuild MPV.
Safety
Lockout/tagout before opening enclosures. Verify zero energy. Bleed system pressure before opening any pneumatic connection.