Singer 7258Q - Page 19

Page 19/37
Original issue
January 2009
Service Manual
COSMO-7/8
series
Model
9. Needle timing to shuttle hook --continued--
2．Tighten screws securely after adjustment.
Meshing condition of shuttle race gear and lower shaft gear
1. Check meshing condition of gear (A) after adjustment.
Check play of the gear at 4 positions –each 90 degree angle of 1 rotation of shuttle
race.
No play on 2 positions to save too loose condition – play on other 2 positions to
save too tight condition.
2. Adjustment of play between shuttle gear and lower shaft gear is made by turning
eccentric ball bushing (D).
*loosen screw (C) on pressing plate so that the ball bushing (D) may be turned.
*Turn the ball bushing (D) in either way by using concave portion.
*The ball bushing is to be placed with mark (F) positioned at upper side within angle of
180 degrees
3. Tighten the screw (C) securely after adjustment.
D
F
C
E