27.
Changing
the
Sewing Hook
1. Remove needle, needle plate, feed dog and bobbin
case
position finger bracket.
2.
Loosen
hook
set
screws
K
and
T (Figs. 29
and
30).
3. Rotate the
balance
wheel until the feed bar is at its highest point.
4. Pull
the
sewing
hook
off Its
shaft.
5. With
the
feed
dog
set
at Its
highest
point,
push
the
new
hook
onto
the
hook
shaft
and
replace
the
bobbin
case
position finger bracket. As you
replace
this
bracket,
make
sure
there is a
clearance
of .024 to .036", or 0.6 to 0.9 mm, between the tip of the
position finger
and
the
bottom
of
the
position
slot
in
the
bobbin
case
base
(Fig. 31).
6.
Time
the
sewing
hook
as
instructed
in
Chapter
25
and
tighten
set
screws
K
and
T
securely.
7.
Replace
feed
dog
and
needle
plate.
28.
Dismantling
the
Thread
Take-up
1.
Remove
face
cover,
presser
foot
(with
screw)
and
needle.
2.
Take
out
pressure
regulating
screw
and
remove
presser
bar
spring.
Loosen
set
screw
c (Fig. 28)
and
pull
the
presser
bar
up
out
of
the
machine.
Pull
thread
regulator
J (Fig. 28),
presser
bar
guide
collar
and
presser
bar
lifting
bracket
back
out
of
the
machine.
3.
Remove
complete
needle
bar
frame
assembly
so
that
the
height
setting
of
the
needle
bar
will not be
disturbed.
To do this,
loosen
set
screw
b (Fig. 36)
and
remove
eccentric
stud
a.
Then
loosen
screw
f
(Fig.
28)
and
pull
out
hinge
stud
g.
This
done,
pull
the
needle
bar
frame,
enclosing
the
needle
bar,
forward
out
of
the
machine.
4.
Take
out
plastic
plug
U
on
the
back
of
the
machine
arm
(Fig.
32)
and
strip
the
lift
ing
lever
assembly.
5.
Rotate
the
balance
wheel
until
take-up
crank
screw
Q in
the
needle
bar
crank
can
be
reached
through
the
aperture
on
the
back
of
the
machine
arm
(Fig.
33).
6.
Loosen
take-up
crank
screw
Q.
7.
Loosen
set
screw
P on
take-up
link
stud
(Fig. 33).
8.
Place
the
bar
of
the
pull-off
device
across
the
face
side
of
the
machine,
as
shown
in
Fig. 34.
Insert
the
threaded
end
of
the
pull-off
device
through
the
hole
in
the
bar,
screw
it into
the
hollow
hinge
stud
of
the
take-up
link
and,
in
this
way, pull
the
hinge
stud
out
of its mount. (The pull-off device is available under No. 880141/00 and will be
supplied
at
extra
cost.)
9.
Cautiously
pull
out
the
take-up
lever
assembly,
including
the
take-up
lever
link,
take-
up
crank
and
needle
bar
connecting
link.
43
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