Visible oil weeping or dripping near the drive-end shaft seal.
1
Worn shaft seal (lip seal or mechanical seal)
Rotary screw
CheckWipe area clean, run unit, and observe for fresh seepage at the seal specifically (vs. gasket elsewhere).
FixReplace shaft seal per OEM kit and procedure; inspect shaft surface for grooving.
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2
Sump pressure/crankcase pressure abnormally high, forcing oil past seal
Rotary screwReciprocating
CheckCheck breather/vent for restriction; verify normal sump pressure.
FixClear restricted breather/vent line.
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3
Shaft misalignment or coupling wear causing seal wobble
CheckCheck coupling alignment (laser or dial indicator) per OEM tolerance.
FixRealign drive train; replace worn coupling elements.
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4
Bearing wear allowing shaft runout at the seal
highCheckCheck for radial play at the shaft with a dial indicator.
FixReplace bearings; inspect seal bore for damage.
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Safety
Lockout/tagout before opening enclosures. Verify zero energy. Bleed system pressure before opening any pneumatic connection.