KIT-MAIN DRIVE ASSY

HP A2W77-67908 Main Drive Assembly is a replacement drive unit for compatible HP M855 and M880 printers. It supports the printer’s internal drive mechanisms, including the toner cartridge drive assembly, which is part of this unit.

HP service documentation identifies this assembly as a replacement when specified drive or sensor tests fail. It is intended for printer servicing where the main drive assembly is identified as the faulty component.