Xerox Phaser 8510 User Manual page 233

5.
Adjust the output tray for short or long paper.
For media shorter than 190 mm (7.5 in.), flip up the
paper stop.
Phaser® 8560MFP/8860MFP Multifunction Printer
8860mfp-016
For media longer than 297 mm (11.7 in.),
extend the output tray.
9-10
Clearing Paper Jams
8860mfp-017