Bosch
Motor Bearing Wear or Fan Damage
Vacuum is extremely loud or makes grinding/rumbling noises
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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 motor bearings in Bosch high-speed motor, Foreign object in motor fan, Misaligned motor shaft, Cracked fan blades
How to Fix / Troubleshooting
Safety first: Remove the battery before inspecting the motor area. Do not insert metal tools into the motor.
- Check for external causes: Remove the dust bin and filters. Inspect the motor inlet for debris. Use a flashlight to look for foreign objects near the fan.
- Spin test: If accessible, gently spin the fan with a plastic tool. Roughness, scraping, or wobble indicates bearing or fan damage.
- Isolate noise: Run the vacuum briefly without the tube/nozzle to confirm the noise is from the main body, not the brush head.
- Do not lubricate: Motor bearings are sealed and not user-lubricable. Adding oil can cause more damage.
- Replace motor: If grinding or rumbling persists, the motor assembly should be replaced. Continued use can lead to complete failure or overheating.
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Repair Difficulty
Hard
4/5
Required Part
Motor Assembly
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