| Symptom | Likely Cause | Recommended Action | | :--- | :--- | :--- | | High-frequency gear whine | Worn gear profile or low oil level | Inspect gear contact pattern; top up oil. | | Intermittent vibration spikes | Debris in gear mesh or bearing spalling | Perform oil analysis; borescope inspection. | | Oil leakage at output seal | High internal pressure or worn seal | Check breather vent; replace seal. | | Overload tripping | Material choking in mill or foreign object | Clear mill cavity; inspect coupling shear pins. |
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