Remove the side brush, clear wrapped hair and reinstall it securely.
Roborock's Q Revo manual says the side brush should be removed and cleaned as routine maintenance, and its common-issues section specifically says a jammed side brush should be cleaned. Start there before assuming the drive motor has failed.
Find why the side brush is not turning
Is there hair, thread or debris wrapped around the side brush or its center hub?
Turn the robot off and inspect the brush closely before removing it.
How to restore side-brush movement
Power the robot off
Do not remove or clean a rotating brush while the robot is running.
Remove the side brush
Use a suitable screwdriver to loosen the center screw, then lift the brush away from the robot.
Clear the hub and brush
Remove wrapped hair, thread and debris from the center and from around the brush arms. Roborock recommends cleaning the Q Revo side brush monthly.
Inspect for wear or deformation
If an arm is badly bent, cracked or worn, replace the brush. The Q Revo manual gives a normal replacement interval of about 3–6 months, depending on actual use.
Reinstall it flat and secure
Seat the brush correctly on the hub and tighten the center screw so the brush is secure.
Run a controlled cleaning test
Put the robot upright on an open hard floor and run a short normal cleaning pass. If the brush remains stationary after cleaning and correct installation, use Roborock support.
When to stop DIY
If the side brush is clean, undamaged and correctly installed but never turns during normal cleaning, do not open the robot to reach the side-brush motor, gearbox or internal wiring. Have the drive system diagnosed by qualified service.
Check these guides if cleaning is still weak
Not Picking Up Dirt
Use this if the side brush turns but the Q Revo still leaves crumbs, dust or pet hair behind.
Auto-Empty Not Working
Use this if debris reaches the robot dustbin but is not transferred into the dock after cleaning.