8. Seize Ihe bobbin cose
base
with thumb
and
forefinger, pull it to the
left
end
down,
and
take
iit
out
of
the machine.
9. Clean hook and bobbin
case
base
thoroughly
and
remove lint with a
pointed wooden instrument, never with o screw driver.
10. It is recommended to screw on position finger bracket a before replac
ing
Ihe
bobbin
case base.
When
inserting
the
bobbin
case base, make
sure that
position
finger
h engages
in
slot I
in
its
rim
and that there
is a clearance of
about
between the tip of position finger h and
the
bottom
of
slot
I.
11. Reploce hook gib d and tighten screws e,,
Oj
and
e^.
12.
Push
the opener finger onto its shaft. Take care that screw c
ride:s
in the
lengthwise
groove of the shaft and that the opener finger covers
about
Vj
of the projection on the
rim
of the
bobbin
cose base.
Tighten
screw
c securely. (Photo 14).
Photo
16
19.
Care
and
Maintenance
Since
the
PFAFF
433
is provided with automatic lubrication there
will
hardly
any
maintenance
be
required
while
the
machine
is
in
operation.
Merely
check the automatic lubrication system regularly and clean the machine
thoroughly.
From
time
to
time
the
oil
in
the
hook
lubrication
system
should
be replenished.
It is
urgently
recommended
to
make
it a
daily
routine
to
brush
off
lint
and
fluff which have accumulated between needle plate and feed dog and on
19
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