Pfaff 3811-2/45 Instruction Manual page 26

.1 Loosen the 2 screws 19 and the two screws 20 (fig. 20).
.2 Using the handwheel, bring the needle bar to its t.d.c. (adjustment hole "1", fig. 19) and lock it in this
position with the cylindrical pin.
.3 Adjust both feed lifting eccentrics 17 and 18 in accordance with the requirement.
.4 Tighten the two visible screws 19 and 20.
.5 Turn the handwheel until the other two screws 19 and 20 are visible. Tighten these screws also.
.6 Remove the cylindrical pin.
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With the needle bar at its t.d.c. (= adjustment hole "1") the notches in the feed
lifting eccentrics 17 and 18 (fig. 18 and 20) should point directly downwards.