Winco
Alternator Bearing Wear
High-pitched whining or growling noise from alternator end of generator.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Worn alternator front or rear bearing, Misalignment causing bearing load, Contaminants in bearing
How to Fix / Troubleshooting
Safety first: Disable AUTO and keep clear of rotating parts.
- Localize noise: Use a mechanic's stethoscope or a long screwdriver (handle to ear) to confirm noise is from the alternator housing, not engine accessories.
- Inspect for heat: After a short run, carefully feel (without touching moving parts) for excessive heat at alternator ends.
- Plan bearing replacement: Alternator bearing replacement requires disassembly of the generator end and should be done by a qualified shop.
Do not ignore bearing noise; failure can damage the rotor and stator.
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Repair Difficulty
Professional Required
5/5
Required Part
Alternator Bearing
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