Thank you for using the Support Forum. I am not sure what the part is called it may be the separator if that is a picture of a duplex document feeder. See this article for how to change it out. If this does not help please consider contacting your support centre for further assistance.
Thanks, CherylO-Xerox Community Manager
Be sure to click Kudos for those who have helped you. Select Accept as Solution for posts that have helped to solve your issue(s)!