Singer class 251 - Upright Arm Shaft Removal and Replacement; Wick and Connecting Stud Replacement; Oil Wick Holder Removal

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38
TO
REMOVE
AND
REPLACE
THE
UPRIGHT
ARM
SHAFT
If it is
found
necessary
to
remove
the
upright
arm
shaft
K3, Fig.
52,
it
should
be
removed
in
the
following
manner:-
1.
Remove
oil
pump,
as
in-
structed
on
pages 33
and
34.
2.
Remove
sewing
hook
shaft,
as
instructed
on
page
33,
except
that
instead
of
immediately
replacing
hook
shaft
merely
remove
hook
shaft
bevel
gear.
3.
Remove
arm
top
cover.
4.
Remove
screw
L3
and
oil
lead
M3,
Fig. 52.
5.
Remove
four
cap
screws
N3,
Fig. 52.
6.
Remove
oil
flow
window
cap
03,
window
P3,
oil flow
body
R3
with
two
gaskets
Q3,
Fig.
52.
7.
Mark
the
two
bevel
gears
S3,
Fig. 52,
with
chalk
or
crayon,
on
one tooth
of
one gear and
the corresponding space be-
tween the teeth of the other
gear
so
that
these
gears
may
be
re-assembled,
if
necessary,
in
their
original
relative
posi-
tions
without
difficulty.
Fig.
52.
Removing
Upright
Arm
Shaft
8.
Loosen
set
screws
T3, Fig.
52
in
bevel
gear
at
upper
end
of
up-
right
arm
shaft.
9.
Make
certain
bevel
gear
at
lower
end
of
upright
arm
shaft
is
fastened
securely.
Then
while
holding
upper
bevel
gears
S3
in
mesh,
draw
upright
arm
shaft
down
and
out
of
machine
and
insert
new
upright
arm
shaft
up
through
bevel
gear,
as
shown
in
Fig.
52.
l 0. Turn
shaft
so
that
one
of
the
two
set
screws
T3
will
bear
upon
the
upper
gear
flat
on
the
shaft
and
tighten
the
set
screws
T3.
11.
Replace
hook
shaft
with
hook
shaft
bevel
gear
as
instructed
on
page
33.
12.
Replace
oil
pump,
as
instructed
on
page
34.
13.
Replace
oil
flow
window
assembly,
oil
lead
and
arm
top
cover
as
shown
in
Fig. 52.
39
TO
REMOVE
AND
REPLACE
ARM
SIDE SHIELD
WICK,
NEEDLE BAR
WICK
AND
NEEDLE BAR
CONNiCTING
STUD
WICK
Arm side shield wick
may
be
removed,
after
removing
face
plate
and
two
screws
U3,
Fig.
53.
Lift
arm
side
shield
V3,
Fig.
53
up
and
out
of
machine.
When
replacing
arm
side
shield
wick,
make
sure
that
lower
end
of
wick
drops
into
oil
pool
beneath
needle
bar
crank
and
that
the
two
upper
wick
loops
come as
close
as
possible
to
the
needle
bearings
F3,
Fig.
54
without
touching them.
Then
replace
and
securely
tighten
screws
U3.
To
remove
needle
bar
wick
and
connecting stud wick,
move
take-up
lever
H3,
so
that
it
does
not
inter-
fere
with
removal
of
oil
guard
W2.
Then
remove
face
plate
and
screw
R2, Fig. 53;
lift
take-up
oil
guard
W2,
Fig.
53,
with
the
two
wicks,
up
and
out
of
machine.
When
replacing
needle
bar
___
-R
2
~~
I
...
-HJ
\
W2
r-N~EDLE
ll
·BAR
WICK
if.
STUD
WICK
wick
and
connecting
stud
wick
Fig.
53.
Arm
Side
Shield
Wick,
Needle
Bar
make
sure
that
lower
end
of
wick
Wick
and
Connecting
Stud
Wick
drops
into
oil
pool
behind
lower
needle
bar
bushing
and
that
upper
wick
loop
is
behind
the
needle
bar,
as
shown
in
Fig.
53.
TO
REMOVE
OIL
WICK
HOLDER
Oil
wick
holder
includes
two
oil
wick
leaders,
see
Fig.
55,
and
one
oil
wick
for
the
needle
bar
link
and
for
the
two
sets
of
needle
bPminq~
in
the
thread
take-up
as
shown
in
Fig.
54.
It is
removed
in
the
follow-
ing
manner:-
.....--YJ
~'Ji
HOLDER
LOOP
~
SHOULD(
TOUCH
:(
W3
:r
BOTH
; ; LOOPS
''
' JUST
CLEAR
FJ
l.
Remove
face
plate,
needle
bar
and
upper
needle
bar
bushing
from
the
machine,
as
instructed
on
page
35.
2.
Remove
upper
section
of
presser
bar,
as
instructed
on
page
35.
3.
Remove
stud
C3, Fig.
46,
as
in-
structed
in
steps
6
and
7
on
page
36.
4.
Remove
holder
screw
W3,
Fig. 54.
5.
Pulling
gently,
draw
entire
oil
Fig.
54.
Wick Loops
for
Needle
wick
holder
assembly
out
of
the
Bar
link
and
Thread
Take-up
head
of
the
machine.
TO
INSTALL OIL
WICK
HOLDER
l.
Remove
parts
mentioned
in
Steps
l
to
3,
above,
under
removal
of
oil
wick
holder.