Pfaff 3811-2/45 Instruction Manual page 30

.1 Bring the needle bar into a position 0.8 mm below its t.d.c. (handwheel) and lock it in this position
with the cylindrical pin.
.2 Loosen screw 3 (fig. 4).
.3 Change the size of the clearance in accordance with the requirement by pulling out or pushing back
the connection rod 1.
.4 Tighten screw 3.
.5 Carry out a check.
.6 Remove the cylindrical pin.
30
With the needle bar 0.8 mm below its t.d.c. (= adjustment hole "4") there
should be a clearance of approx. 16.5 mm (0.65 inches) between the eye of
the connecting rod 1 (fig. 2) and the machine housing 2.