Pfaff hobbylock 774 Owner's Manual - Page 18

d. Replacing the upper knife DURING THIS OPERATION DISCONNECT THE PLUG FROM THE MAINS OUTLET. 1. To remove the upper knife. Push into the right, and turn down anti-clockwise towards you, the upper knife release knob, until the knife is held in position by the carrier stopper (approximately horizontal to you). Then loosen the retaining screw and take off the knife, taking care not to touch the blade. 2. Fitting a new upper knife Place the new knife onto the carrier stopper (in the opposite manner as abnve), and, using a screwdriver, retighten the retaining screw (A) securely. Turn the release knob away from you, raising the knife to a vertical position, then, by releasing pressure on the knob, the knife will be brought firmly against the lower knife and behind the guard on the presser foot. It is now ready for normal operation. 3. To set the cutting position: Place the upper knife in the cutting position and, by turning the pulley wheel by hand towards you, lower it to its bottom position at which point the tip of the upper knife should overlap the lower knife by 1.0mm. When in this position, re-tighten the screw (A) securely, using a screw driver. If it is necessary to adjust, loosen the upper knife screw (A) and raise or lower as required. Only very tiny movements shouki be necessary. 1.0mm Surface of needle plate 17