Remove the needle from its resting place. Turn the handwheel forward to set the needle bar at its lowest position.
Put the spacer (63-102600-18) over the needle bar and push it up against the needle bar frame. Put the needle-rise clamp (00-870 137-01) onto the needle bar and tighten it lightly. Place the 2 mm feeler gauge (00-870 136-01) onto the needle bar with its cutout placed above the needle-rise
clamp on the sewing machine.
Loosen the needle-rise clamp and push the 2 mm feeler gauge tightly up against the spacer. Adjust the knurled screw of the needle-rise clamp by tightening it. Turn the handwheel back and forth slightly to ensure that there is no play on the feeler gauge.
Remove the 2 mm feeler gauge from the needle bar. Turn the handwheel in the direction of the sewing until the needle-rise clamp rests on the spacer on the needle bar. Tilt the machine backwards so that you can see the feeding eccentric and connection rod. The lines on each of these parts must be directly opposite each other.
Loosen the three screws in the lower belt if the lines on the feeding eccentric and connection rod are not in direct opposition. Replace the needle-rise clamp and repeat Steps 1 through 4.