D85 Botvac is working fine, but now has a loud knocking/clunking sound when maneuvering. It is intermittent. I service clean the brush and bearings almost every run. I have tightened up the wheel hubs, so that is not the issue. At a loss.
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So the clunking turned out to be the brush motor becoming loose from the brush gearbox.
I removed the gearbox from the D85 and put blue thread-locker on the motor mount screws. I also added a thin nylon washer between the main transmission gear and the gearbox.
Everything is perfecto now.
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where is the gear box
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