DURKOPP ADLER 755 A Service Instructions Manual page 44

Needle bar
4. Manually position the gear tongues (1) so that they are parallel.
5. Turn the needles to bottom dead center.
Fig. 33: Aligning the needle bars with the throat plate (2)
③ ④
(3) - Needle bar linkage (4) - Needle holes
6. Turn the needle bar linkage (3) such that the needles are at the center
of the needle holes (4).
7. Tighten the screw (2).
42 Service Instructions 755 A/756 A - 00.0 - 02/2019