Singer 251-2 - Needle Bar and Presser Bar Procedures; Removing and Replacing the Needle Bar; Removing and Replacing the Presser Bar

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
33
TO REMOVE AND
REPLACE
THE
NEEDLE
BAR
(See
Fig. 51)
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Fig.
51.
Removing
and
Replacing
Needle
Bar
and
Presser
Bar
Remove
the
needle
bar
in
the
following
manner:-
1.
Remove
needle
and
needle
set
screw
(or
needle
clamp).
2.
Remove
face
plate.
3.
loosen
clamping
screw
M.
4.
Loosen
screw
R2
sufficiently
to
allow
needle
bar
to
pass,
then
slip
needle
bar
up
through
both
needle
bar
bushings
and
out
of
machine.
NOTE:
If
it
becomes
necessary
to
remove
upper
needle
bar
bushing
N,
first
remove
screw
R2
and
take-up
lever
oil
guard
W2.
Then
loosen
set
screw
P
and
drive
bushing
N
down
and
out
of
head
of
machine.
Use a
13.
32
inch
driving
pin.
Before
replacing
needle
bar,
replace
upper
needle
bar
bushing
N,
by
driving
it
down
into
hole
provided
for
it
in
head
of
the
machine.
Make
certain
top
of
bushing
N
is
level
with
top
of
arm.
Tighten
set
screw
P.
Replace
needle
bar
in
the
following
manner:-
1.
Slip
needle
bar
down
through
both
bushings
in
head
of
the
machine.
Tighten
screw
M.
2.
Replace
needle
clamp
and
needle.
See
page
8.
3.
Set
needle
bar
at
correct
height
and
replace
face
plate,
as
instructed
in
last
paragraph
on
page
18.
4.
Replace
oil
guard
W2
and
fasten
it
securely
to
bushing
with
set
screw
R2.
TO REMOVE AND
REPLACE
THE
PRESSER
BAR
To
remove
the
presser
bar:-
1.
Remove
presser
foot
and
face
plate.
2.
Remove
presser
bar
pressure
regulating
thumb
screw,
X2,
with
pressure
bar
guide
from
head
of
the
machine.
3.
Loosen
clamping
screw
V
about
one
turn
(just
enough
to
make
it
loose).
loosen
screw
AS
and
slip
guide
bracket
T
up
off
presser
bar
and
out
of
machine.
4.
Slide
presser
bar
up
through
lifting
bracket
U,
Fig.
51
and
bushing
and
out
of
machine.
To
replace
the
presser
bar:-
1. Slip
presser
bar
down
through
lifting
bracket
U,
Fig.
51
and
lower
presser
bar
bushing.
2.
Replace
guide
bracket
T
as
shown
in Fig. 51.
3.
Replace
presser
foot.
4.
Replace
presser
bar
pressure
regulating
thumb
screw
X2
with
presser
bar
guide.
5.
Set
the
presser
bar
at
the
correct
height,
as
in-
structed
on
page
20.
6.
Tighten
screw
V.
7.
Tighten
screw
AS;
making
sure
that
slack
thread
regulator
BS
iust
clears
the
casting.
Replace
face
plate,
as
instructed
on
page
18.