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Disassembly Procedure
Lower Shaft Unit Assembly
1. Remove the retainer ring E4 and loosen the screw (screw, bind M 4 × 14) to remove the feed transmission lever.
3. Remove the two screws (M4) to remove the needle plate A.
4. Remove the one screw (screws pan (S/P washer) M 3 × 6) and remove the inner rotary hook rotation
prevention bracket assembly.
5. Remove the two screws (screw, bind M 3 × 6) to remove the feed dog.
6. Loosen the screw (set screw, socket (CP) M 4 × 4) for the rotary hook shaft receptacle and remove the rotary
hook assembly.
7. Remove the three retainer rings E3 from the vertical feed shaft and then remove the vertical feed shaft and
the feed adjuster.
8. Loosen the two screws (set screw, socket (CP) M 4 × 4) on the lower shaft set collar and then remove the set collar.
9. Remove the one screw (screw, bind M 3 × 4) and remove the feed auxiliary plate.
10. Remove the three screws (screw, bind M 3 × 6) to remove the metal retainer B.
11. Remove the metal.
12. Remove the retainer ring E6 from the timing pulley side of the lower shaft, loosen the screw (set screw,
socket (CP) M 4 × 4), and then remove the timing pulley.
13. Remove the lower shaft assembly.
14. Remove the retainer ring E5 from the horizontal feed shaft and then remove the horizontal feed shaft.
15. Remove the feed base tension spring (Ø3 × 10.5 mm).
16. Remove the two screws (screw, bind M 4 × 20) to remove the rotary hook shaft receptacle.
17. Remove the retainer ring shaft CS and then remove the feed arms A and B from the feed base assembly.
18. Remove the retainer ring shaft CS and the feed arm B.
19. Remove the feed arm receptacle.
20. Remove the feed adjuster shaft assembly.
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