1
Oil carrying over into the air system
highRotary screw
CheckCheck the separator ΔP and inspect the downstream filter bowl and header low points for oil.
FixReplace the separator element and scavenge line orifice/strainer; verify the correct element is fitted.
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2
Overfilled sump foaming out through the separator
medRotary screw
CheckCheck level only after the machine has run and then stopped for the OEM settling time.
FixDrain to the correct mark; use only the specified fluid.
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3
Worn piston rings passing oil into the discharge (recip)
highReciprocating
CheckBlowby at the crankcase breather; oil in the tank discharge and downstream lines.
FixRebuild the pump with new rings, and hone or replace the cylinder.
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4
Oil lost through the blowdown muffler on each unload
medRotary screw
CheckLook for oil misting from the blowdown vent or a wet patch below the enclosure.
FixRepair the blowdown valve and separator scavenge; replace a saturated muffler element.
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Safety
Lockout/tagout before opening enclosures. Verify zero energy. Bleed system pressure before opening any pneumatic connection.