10
MC450e
Adjusting the Clearance between Needle and Hook
1. Remove the base plate (refer to page 2).
2. Remove the presser foot, needle plate and bobbin
holder. Replace the needle (#11) with the test pin.
3. Loosen the setscrews (A), (B) and (C) and tighten the
setscrew (C) slightly.
4. Turn the hand wheel to bring the tip of the rotary hook
behind the test pin.
Adjust the clearance between the test pin and the tip
of the rotary hook to -0.10 to +0.05 mm by moving the
rotary hook set plate up or down.
5. Tighten the setscrews (A), (B) and (C) firmly.
6. Check the backlash between the rotary hook gear and
lower shaft gear and adjust the backlash if necessary.
7. Attach the bobbin holder, needle plate and presser
foot. Replace the test pin with the #11 needle.
8. Attach the bed cover.
The clearance between the needle and the rotary hook should be -0.10 to +0.05 mm.
Test pin
Tip of rotary hook
-0.10 to +0.05 mm
Setscrew (A)
Setscrew (C)
Setscrew (B)
