Certain sewing troubles, such as skipping of stitches or thread breaking, can
not be remedied by lavish oiling.
Excessive
quantities of oil are liable to
soil
the
work
or
mix
with
the
dirt
and
lint
in
the
machine
and
cause
hard
run
ning. Therefore, oil sparingly, but regularly!
Pfaff sewing machine oil is non-resinous ond has the right lubricating pro
perties for this machine. For this reoson, use no other oil in this machine,
b. Dismantling the Shuttle Race
If the machine is in operation continuously, clean the shuttle race from time to
time.
To dismantle the shuttle race, see that the machine is in the regular stopping
position.
Then
tilt it over to the
left,
resting
it on the
wooden
peg. Open the
cylinder
bed cap, press
down
and
pull
it out of the
machine.
Remove
the
bobbin case and the bobbin. Take out screws h and I
{Fig.
71), strip shuttle
race ring d, and take the shuttle out of the shuttle race. Take care that the
springs on screws h and i do not get lost.
The shuttle race proper need not be stripped for cleaning. Take a pair of
tweezers and remove pieces of thread that have accumulated in the
area
behind the shuttle race. Then, with a toothpick or similar wooden object,
clean
the shuttle race.
Never
use a metal tool for this purpose.
To assemble the shuttle
mechanism^
reverse the above procedure.
Fig.
71
Dismantling the shuttle race
77
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