The PF (Paper Feed) gear is used to fix carriage jams in which the cartridge no longer moves to the left. Instead, the print carriage is stuck to the right. Whether the printer is powered on or powered off, the carriage cannot be moved manually, not even with significant force. The error message shows "Paper Jam. The print carriage cannot move. Open the carriage access door, clear any paper jam or obstruction and select OK ." This replacement part replaces the PFG (paper feed gear), which may cause the problem. Follow the steps in the video below to troubleshoot your printer's problem. If a cracked PFG causes the problem, follow the video to replace it. Replace cracked or damaged drive gear that attached to PF drive rod (see picture below). Make sure your carriage jam IS caused by the broken PFG. Inspection & installation video below. Replace cracked or damaged drive gear that attached to PF drive rod. Compatible to HP 8000 Series: Officejet Pro 8010 Officejet Pro 8011 Officejet Pro 8012 Officejet Pro 8013 Officejet Pro 8014 Officejet Pro 8015 Officejet Pro 8016 Officejet Pro 8017 Officejet Pro 8018 Officejet Pro 8019 Officejet Pro 8022 Officejet Pro 8025 Officejet Pro 8028 and other Officejet 80xx