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This guide will explain how to change the side brush motor gear assembly on your Roomba Discovery 4XXX/4XX series, pictured below:

Roomba Discovery 4XXX & 4XX Servicing and Repair Guide

8.1         Side Brush Gear Assembly Replacement

Roomba replacement side brush gear assembly can be found at RobotShop.

Removal Phase

1 –           Remove the spring from the side brush motor holder.

Roomba Discovery 4XXX & 4XX Servicing and Repair Guide

2 –          Unscrew and remove the side brush motor holder.

Roomba Discovery 4XXX & 4XX Servicing and Repair Guide

3 –          Remove the side brush motor.

Roomba Discovery 4XXX & 4XX Servicing and Repair Guide

4 –          Unscrew the two screws in order to remove the side brush gear assembly.

Roomba Discovery 4XXX & 4XX Servicing and Repair Guide

5 –          Remove the side brush gear assembly.

Roomba Discovery 4XXX & 4XX Servicing and Repair Guide

6 –          Unscrew the side brush from the side brush gear assembly and remove it.

Roomba Discovery 4XXX & 4XX Servicing and Repair Guide

Assembly Phase

1 –           Screw the side brush onto the replacement side brush gear assembly.

Roomba Discovery 4XXX & 4XX Servicing and Repair Guide

2 –          Place the replacement side brush gear assembly in its place.

Roomba Discovery 4XXX & 4XX Servicing and Repair Guide

3 –          Screw the two screws to hold it in place.

Roomba Discovery 4XXX & 4XX Servicing and Repair Guide

4 –          Place the side brush motor in its socket in the side brush gear assembly.

Roomba Discovery 4XXX & 4XX Servicing and Repair Guide

5 –          Place the wires correctly.

Roomba Discovery 4XXX & 4XX Servicing and Repair Guide

6 –          Place the side motor holder properly on the side brush motor.

Roomba Discovery 4XXX & 4XX Servicing and Repair Guide

7 –          Screw the side brush motor holder into place.

Roomba Discovery 4XXX & 4XX Servicing and Repair Guide

8 –          Connect the wheel spring to the side brush motor holder. You have now changed the side brush motor gear assembly.

Roomba Discovery 4XXX & 4XX Servicing and Repair Guide

For details on how to reassemble the Roomba’s frame, please see the Roomba Discovery 4XXX & 4XX Servicing and Repair Guide, Ch. 2: How to Open Roomba / Replace Frame.

For addition help contact the RobotShop Technical Team via our Online Support Center.

Roomba replacement parts can be found at RobotShop.

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