HP d640 HP D640 High-Volume Printer - User Manual (Printer and Accessories), C - Page 151

Printer Pick Roller Kit - Replacing the Tray Pick Rollers 1. Install the smaller lower roller (torque limiter roller) so that the notch in the roller's plastic fits over the metal pegs on the shaft. When this roller is correctly in all the way, the roller is locked and will not rotate. See Figure 4-47. Notch correctly positioned to go over metal peg Roller correctly installed all the way, with notch over the metal peg Figure 4-47 Correct Torque Limiter placement 2. Install the larger lower roller on the same shaft. The larger roller (when correctly positioned) fits onto two small plastic pegs on the smaller lower roller. You may need to rotate the larger roller against the smaller roller until it snaps into place. See Figure 4-48. Larger lower roller positioned on the same shaft as the smaller roller Larger lower roller rotated to engage plastic pegs on smaller Figure 4-48 Correct Larger Lower Roller placement 4-38 Ordering and Replacing Consumables