12
MC350E
A
B
Adjusting Backlash between Hook Drive Gear and Lower Shaft Gear
The rotary play of the hook should be 0.8 mm or less.
Adjust the backlash after the adjustment of the clearance between needle and rotary hook.
To check:
1. Turn the power switch “OFF”.
2. Remove the base cover, bed cover, needle plate
and bobbin holder.
3. Jog the hook race with fingers to check the rotary
play.
“If the play is larger than 0.8 mm or the gears do not
turn smoothly, adjust the backlash as follows”.
Adjustment procedure:
1. Remove the bed cover (See page 4) and loosen the
Screw .
2. Turn the Lower shaft bushing (Eccentric), in the
direction “B” when the play at shuttle hook tip is too
small.
3. Turn the Lower shaft bushing (Eccentric), in the
direction “A” when the play at shuttle hook is too large.
4. Tighten Screw securely after adjustment.
Note:
Do not move the lower shaft bushing in a lateral
direction, otherwise the torque of thelower shaft will
change.
Screw
Lower shaft bushing
A
B
B
A
B
A
The rotary hook play
should be 0.8 mm or
less.
B
A
