Abnormal gear mesh noise distinct from airend rotor noise.
1
Low or degraded gear oil
Rotary screw
CheckCheck gearbox oil level and condition (viscosity breakdown, water contamination, particulate).
FixTop up or change gear oil per OEM interval and spec.
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2
Gear tooth wear or pitting
highRotary screw
CheckOil analysis for metal particles; borescope inspection if accessible.
FixGearbox rebuild/replacement by qualified technician.
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3
Bearing wear within gearbox
Rotary screw
CheckVibration analysis at gearbox; listen with stethoscope at bearing housings.
FixReplace bearings; inspect gears for collateral damage.
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4
Misalignment introducing abnormal gear loading
Rotary screw
CheckCheck motor-to-gearbox alignment.
FixRealign per OEM tolerance.
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Safety
Lockout/tagout before opening enclosures. Verify zero energy. Bleed system pressure before opening any pneumatic connection.