Clearance between needle and hook
Check
1. Insert a new #90 needle.
2. Set pattern selector dial to "C", stitch width to "Max".
The clearance between the needle and shuttle hook should be 0 to +0.07 mm.
Adjustment
1. Remove free arm cover.
2. Remove shuttle hook holder.
3. Set needle at its lowest point when it swings to right, stop at the position when point of the needle and shuttle hook
align.
4. Loosen screws (a, b) of open shuttle race.
5. Move shuttle race (B) forward / backward to adjust movement.
Forward = tighten the distance
Backward = lengthen the distance
6. Make sure space between needle and tip of hook is 0- 0.07mm.
7. After adjustment, re-tighten the screws.
8. Re-assemble shuttle hook holder and covers.
NOTE! This adjustment affect "Timing of needle and hook" and "Play between shuttle driver shaft gear and lower shaft
gear"
104 72 72-26
0-0.07 mm
17