Machine vibrates excessively or feels unstable when the brush is running.

Safety first: Unplug the machine before inspecting the brush.

• Inspect brush roller: Remove the brush and roll it on a flat surface to check for bending or warping.
• Check bristles: Look for areas of uneven wear or missing bristles that could cause imbalance.
• Verify mounting: Ensure all screws and brackets holding the brush housing are tight and not cracked.
• Replace brush: If the roller is bent or badly worn, replace it with a new Numatic brush assembly.