DuroMax
Alternator Bearing Wear / Mechanical Noise
Generator makes high‑pitched whining or grinding noise from alternator end
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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 bearings, Misaligned rotor, Loose alternator mounting bolts, Foreign object contact inside alternator housing
How to Fix / Troubleshooting
Safety first: Shut down the generator, disconnect battery negative, and wait for all rotating parts to stop before inspection.
- Inspect alternator housing: Remove the end cover and look for debris or loose hardware contacting the rotor.
- Check mounting bolts: Tighten alternator mounting bolts and brackets to specification.
- Spin test: Rotate the rotor by hand (engine off). Roughness, grinding, or excessive play indicates bad bearings.
- Replace bearings or alternator: Bearing replacement requires alternator disassembly and press tools; many owners opt to replace the entire alternator assembly with a DuroMax unit.
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Repair Difficulty
Hard
4/5
Required Part
Alternator Bearing
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