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Adjustment procedures
Results of Improper adjustment
1. Remove the feed bracket, the feed plate, and the throat plate. Ad-
just the positioning of shuttle upper spring
❷
with two setscrews
❶
.
2. Using the setscrew
❹
, adjust the amount of overlapping
D
for
the lower thread holder
❸
and the shuttle upper spring
❷
.
(Caution) Right and left position of the shuttle upper spring
❷
can also change during hook adjustments. Position
adjustment for the shuttle upper spring
❷
should be
done after the completion of standard "3.-(10) Hook
adjustment", without fail.
o
If there is a front and rear dis-
placement or a right and left dis-
placement, needle thread biting
may occur into the hook.
o
Too much motion to the rear side
will cause the moving knife to fail
to hook the needle thread.
o
Too much motion to the left side
will cause the moving knife to fail
to hook the bobbin thread.
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