11
MC450e
Adjusting the Backlash between the Rotary Hook Gear and Lower Shaft Gear
1. Remove the bed cover (refer to page 3).
2. Remove the needle, presser foot, needle plate and
bobbin holder.
3. Loosen the setscrew.
Check the rotary play of the hook.
4. Turn the lower shaft bushing (eccentric) in the
direction “A” if the gears do not turn smoothly.
Turn the lower shaft bushing in the direction “B” if the
rotary play is larger than 0.8 mm.
5. Tighten the setscrew.
6. Attach the bobbin holder, needle plate, presser foot
and needle.
7. Attach the bed cover.
The rotary play of the hook should be 0. 8 mm or less.
A
B
Setscrew
Lower shaft bushing
Rotary play should be
0.8 mm or less.
