Backlash ( Lower Shaft Gear ) - Janome JP720 Servicing Manual

Mechanical Adjustment

Backlash ( Lower shaft gear )

To check
1. Turn the power switch off.
2. Remove the needle plate and bobbin holder.
3. Turn the handwheel slowly toward you until the tip of the hook
4. Rock the hook race with fingers to check the rotary play. It should be within 0.8 mm.
*If there is more than 0.8 mm play, adjust as follows.
Adjustment procedure:
1. Remove the bed cover and loosen the setscrew
2. Turn the lower shaft bushing (eccentric)
3. Turn the lower shaft bushing (eccentric)
e
4. Tighten setscrew securely after adjustment.
E
F
e
e
.
r
, in the direction " E " when the play at hook tip is too small.
r
, in the direction " F " when the play at hook tip is too large.
r
Lower shaft gear
q
is between both ends of feed dog
Groove of lower shaft bushing (D)
F
E
14
w
w
q
Check the play.
.