Introduction
Replace a Roborock S5 side brush motor to fix the small three-pronged brush on the side when it no longer spins.
Tools
Parts
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Power down your Roborock and place it upside down on a flat work surface.
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Use a Phillips #2 screwdriver to loosen the captive screw holding the side brush in place.
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Remove the 2 screws of the gearbox.
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Carefully lift of the lid (try not to break the clip or loose the gears)
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Pull the 2 white plastic gear wheels off to the top (potentially inspect those for damage while it's open anyway).
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Conclusion
To reassemble your device, follow these instructions in reverse order.