11
MC350E
Adjusting Clearance between Needle and Hook
The clearance between needle and rotary hook should be - 0.1 to + 0.05 mm.
1. Remove the needle plate, bobbin holder, base cover
and bed cover (See pages 3 - 4).
Replace the needle with the Test pin .
2. Loosen Screws , , temporarily and retighten
Screw slightly.
3. Turn the handwheel to bring the tip of the rotary hook
behind the test pin .
4. Adjust the clearance between the test pin
and the Tip of rotary hook to - 0.1 to + 0.05mm
by moving the Rotary hook set plate up or down.
Tighten the Screws , , firmly.
5. Check the rotary hook driver gear and the lower shaft
gear backlash.
If gears mesh or engage tightly or loosely, check
“Adjusting Backlash between Hook Drive Gear and
Lower Shaft Gear”. (See page 12)
Note:
Do not move the rotary hook set plate in a lateral
direction, otherwise the hook timing will change.
6. Reattach the needle.
Reattach the bed cover, base cover, base lid, bobbin
holder, needle plate and needle.
Screw
Screw
Screw
Test pin
Tip of rotary hook
–0.1 to +0.05 mm
Rotary hook set plate
A
B
C
B
D
E
G
A
B
C
F
D
D
A
B
C
G
D
E
F
D
B
A
C
D
F
E
G
