The suction side on the pump is much smaller than the output side - you would have to try really really really hard to mess it up, but the pumps do fail and will cause the machine to dust. It is a PM item (2.4M if I remember correctly) and you should replace the sucked toner collection bottle, toner pump, and hoses as well. (I replace the hoses with vacuum line from an automotive parts store - the Ricoh lines collapse and the inside lining sometimes separates and bubbles - never had to clean one out after I started doing this)
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