Brother MFC 8840, Document Feeder is not workting

Question

Need some guidience, we have a Brother MFC 8440, the document feeder is not working. Originally the copier was not acknowledging the paper in the feeder, after looking through this site, we replaced the Left Hinge, now the feeder acknowledges there is paper in the feeder, but it will not pull pull the paper through the feeder.

I used this copier a lot, every day, it gets to be a pain to have to place each paper on the glass bed to get a copy or fax done.

Thanks for any help you can offer.