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1. Remove the work feed bar, feed plate, and the throat plate. Make
adjustments with the screw .
(Caution) The right and left positions can also change during (10)
hook adjustments. Position adjustment for the large hook
upper spring should be done after the completion of
standard hook adjustment, without fail.
Adjustment Procedures
Results of Improper Adjustment
o If there is a front and rear
displacement or a right and left
displacement, needle thread
biting may occur into the hook.
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 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.
1. If the shuttle felt seems to be protruded or it has been replaced
with a new one, push it in by means of tweezers or the like.
(Caution) Do not push it in excessively. Align the height and the
plane of the shuttle race .
Adjustment Procedures
Results of Improper Adjustment
o If the shuttle felt is protruded,
this will be turned into a rotary load
of the inner hook, causing a
sewing error.
o If the shuttle felt is missing or
pushed in too much, this will re-
sult in hook lubrication deficiency,
causing hook overheating and
wear.
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