Position of needle and hook
18 Service Instructions 171/173 - 00.0 - 01/2020
Proper setting
The distance between the middle of needle and the lower shaft bearing on
the left is 39.8 mm.
The distance between the middle of the needle and the end of the rocker
bolt is 38.8 mm.
The rocker bolt must be pushed up against the face of the lower shaft.
To adjust the rocker bolt for the hook drive and the lower shaft bearing on
the left:
1. Tilt the machine head.
2. Loosen the screw (9).
3. Drain the oil.
4. Erect the machine head.
5. Disassemble the following components:
• Needle
• Needle guard
• Hook carrier (8) with hook
• Thread trimmer (7)
6. Loosen the screw (11).
7. Carefully pull off the hook drive housing (10).
While doing so, slowly turn the lower shaft (3).
8. Tighten the gage (1).
9. Loosen the screws (5).
10. Move the lower shaft bearing (6) up to the gage (1).
11. Tighten the screws (5).
12. Loosen the screws (4).
13. Check if the rocker bolt (2) is pushed up against the face (3) of the lower
shaft.
14. Disassemble grease cap and oil collection tray (15).
15. Loosen eccentric (13), set collar (14) and gear wheel (12).
16. Move the lower shaft (3) such that there is a distance of 1 mm between
lower shaft bearing (6) and rocker bolt (2).
The rocker bolt (2) abuts on the gage (1).
17. Push the set collar (14) up against the eccentric (13).
18. Align the gear wheel (12).
19. Tighten the screws.
20. Check the movement of the toothed belt on the lower toothed belt
wheel.
21. If required, align the lower toothed belt wheel.
22. Tighten the screw (9).
23. Assemble the hook drive housing (10).
24. Top off the oil.
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