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Introduction
The pinion gear on the electric brush can wear out, causing the brush to stop spinning.
What you need
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Turn the device over and remove all screws.
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Remove the white cover
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Remove the inner cover. To do this, carefully loosen the cover and then pull it out to the right so as not to damage the fiber-optic cables.
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Disconnect the gearbox from the circuit board and remove it.
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If you want to replace the complete gearbox, you can install the replacement part now
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Remove the rubber damper.
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Heat the upper part of the gearbox with a heat gun until the cover can be pried off using a spatula or similar tool.
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Then remove the green pinion gear and replace it with a new one.
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Follow the steps in reverse order to reassemble your device.
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