Hi yoda108,
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.
Someone removed this clear piece of plastic (former location marked on the picture). Does anyone know what it's called? I'm trying to get a hold of a new one, because now the paper get stuck..
Thanks!