Singer 9985 - Backlash of Hook Gear

SERVICE MANUAL
27
14. 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.
1. Free play at the tip of hook may be 0.1-0.3 mm.
If it is not so, adjust as follows.
2. Remove the front enclosure.
3. Loosen the screw (a) and turn the lower shaft eccen-
tric 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.
4. Re-tighten the screw (a) tentatively and check that the
correct play has obtained.
5. Tighten the screw (a) securely.
6. When you have adjusted the backlash of hook gear,
check the timing of the hook again. (Sec. 3)
3
a
b
1
0.1-0.3 mm