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16. CLEANING SHUTTLE RACE
It is necessary to disassemble the shuttle race and take out the shuttle hook for cleaning
after a long time of using. Otherwise the fluff would accumulate there and cause frequent
hitching of the thread.
We have two types of shuttle race, back-open and front-open, which are different in
disassembling.
(1) To disassemble the back-open shuttle race, take off the driving belt, turn up the
machine head, raise the needle bar to its top position, take out the bobbin case, loosen the
shuttle race screws (Fig. 28-1-1) by a screwdriver and you can remove the shuttle race.
Hold the front-face of it with your left hand, take out the shuttle hook from the back-face
of it with your right hand. Be careful that the hook tip should point downwards and the
hook should be lightly pulled out of the center of the circle of the shuttle race.
If the fluff accumulated in the shuttle-retaining ring (Fig. 28-2-1), the ring should be
removed before cleaning. Remove the ring spring (Fig. 28-2-3) by taking out the screw
(Fig. 28-2-2) with a screwdriver. After cleaning, put the ring (bevel face outwards) into
the two pins (Fig. 28-2-4), place the spring on it and retighten the screw. You can
assemble the shuttle hook ad shuttle race by reversing the processes. Making sure that the
guide rail (Fig. 28-2-5) should engage with the guide slot before retightening the shuttle
race screws.
(2) It is very simple to disassemble the front-open shuttle race.
Raise the needle bar to its top position, draw the slide plate open, and take out the bobbin
case. Push aside the left and the right latches (Fig. 28-3-1).
Fig. 28-1
Fig. 28-2
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