Introduction
This motor is what keeps that yellow side brush turning, picking up hairs and things dust in those hard to reach places.
Tools
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            First start by removing the two - 6mm screws with your Phillips head #1, that unlock the motor from your Roomba 
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            Pull the brush motor out 
 
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            Next, with the same head remove the screw holding the plastic housing together 
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            Carefully pry the gear box open by placing a flat head screwdriver in the slot 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.