Bosch Mechanical Drive Noise / Worn Bearings

Carpet cleaner makes loud rattling or grinding noise during operation

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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 brush roll bearings, Damaged brush motor bearings, Foreign object in brush housing, Loose fan impeller on suction motor

How to Fix / Troubleshooting

Safety first: Unplug the machine immediately if abnormal noise occurs.

  • 1. Inspect brush area
    • Remove the brush access cover and brush roll.
    • Look for coins, stones, or hard objects trapped in the housing.
    • Check brush bearings for play or roughness; replace the brush roll if worn.
  • 2. Check brush motor
    • Spin the brush motor shaft by hand; it should turn smoothly without grinding.
    • If noisy, replace the brush motor assembly.
  • 3. Inspect suction motor fan
    • Access the suction motor compartment.
    • Check that the plastic or metal fan impeller is secure on the shaft and not rubbing the housing.
    • If the impeller is cracked or loose, replace the motor or fan as a unit.
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Repair Difficulty

Medium 3/5

Required Part

Brush Roll Assembly
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