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Service Manual
SEC.12-2
Needle timing to shuttle hook (2)
Meshing condition of shuttle race gear and lower shaft gear
1. Check meshing condition of gears after adjustment.
Check play of the gear at 4 positions –each 90 degree angle of 1 rotation of shuttle
race.
No play on 1 positions to save too loose condition – play on other 3 positions to
save too tight condition.
One rotation of main shaft
will rotate shuttle by two
revolutions.
There should be some
space between those two.
Adjustment of play between shuttle gear and lower shaft gear is made by turning
eccentric ball bushing (A).
*loosen screw (B) on pressing plate so that the ball bushing (A) may be turned.
*Turn the ball bushing (A) in either way by using concave portion.
*The ball bushing is to be placed with mark (C) positioned at upper side within angle
of 180 degrees
3. Tighten the screw (C) securely after adjustment.
Original issue
Page 33／64
Model
C
May 2014
XL-420
| 33
A
B
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