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3. BACKLASH OF HOOK GEAR
If there is too much play on the hook gear on the
turning direction, it may be the cause for machine
not to sew properly and/or making excessive sewing
noise.
Check
1. Free play at the tip of hook may be 0.1-0.3 mm.
Note: To do this check on least 3 different spots
during the revolution of the hook by turning the
handwheel.
Adjustment
1. Remove the front enclosure.
2. Loosen the screw (a) and turn the lower shaft ec-
centric ball bushing up or down by hooking the tip
of (–) driver into the left side groove (b) of bushing.
• Turn upward: The play will increase
• Turn downward: The play will decrease.
3. Re-tighten the screw (a) tentatively and check that
the correct play has obtained.
4. Tighten the screw (a) securely.
5. When you have adjusted the backlash of hook
gear, check the timing of the hook again. (Sec. 2)
4
Settings
1
0.1-0.3 mm
2
View from upward
View from frontward
a
b
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