Oki ES3640MFP Component Replacement Manual page 45

Tray 1 Feed Rollers
Note:
Feed Roller (Pick-up, Feed. Retard) removal is identical for all Universal Trays. However, each roller is unique.
Match each replacement roller to the roller being removed.
1. Remove Tray 1.
2. Open Right Lower Door.
3.
Release the hook that secures each roller to the shaft
Side Output Tray
1. Open the Top Cover.
2. Remove the Left Front Cover.
3.
Release the Stopper Links from the printer frame.
4. Release the tray from the 2 posts by flexing the tray right to clear the left post and slide left to remove.