15
Lower shaft bushing
Hexagonal socket screw (D)
0.8mm or less (F)
Tip of hook (E)
A
B
1. Remove the machine base (refer to page 2).
2. Remove the needle, needle plate and bobbin
holder.
3. Loosen the hexagonal socket screw (D).
4. If the backlash is too much, turn the lower shaft
bushing in direction A.
If the backlash is too little, turn the lower shaft
bushing in direction B.
5. Tighten the hexagonal socket screw (D).
6. Attach the needle, needle plate and bobbin
holder.
7. Attach the machine base.
NOTE: After adjusting the backlash, be sure to
check and adjust the ”HOOK TIMING” and
the “FEED DOG HEIGHT” (refer to pages 12
and 17).
TO ADJUST BACKLASH OF HOOK DRIVE AND LOWER SHAFT GEARS
The gears turns smoothly and rotary play of the hook should be 0.8 mm or less (F) when the tip of
hook (E) is within the width of the feed dog (C) as shown below.
Width of the feed dog (C)
