Joe's Random Ramblings

I have owned a Roomba for some time now. Some time ago, I wrote about my positive experience with the iRobot customer service, which resulted in me getting a new Roomba.
After extensive use, this Roomba now developed some problems: The engine would run idle, and the brushes would not turn. Since the warranty is now long expired, I set out to investigate this myself.
I found that the gearbox at the brush motor was broken. Some gears had flat spots:

A look at eBay showed somebody selling the gear set. So, I ordered that, and replaced the old gears in the gearbox:

The result: the Roomba works fine again.