Singer class 251 - Hook Shaft Removal and Replacement; Oil Pump Removal and Replacement

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
32
Fig.
45.
Removing
and
Replacing
Bobbin
Case
Holder
(Correct Position
of
Bobbin
Case
Holder
in
Relation to
the
Sewing
Hook)
NOTE:
While
the
sewing
hook
is
off
the
shaft,
it
is
advisable
to
replace
the
oil filter
143350,
Fig.
45,
in
the
end
of
the
hook
shaft.
Unscrew
the
filter
from
the
center
of
the
shaft
al
H2, Fig.
45
and
replace
with
a
complete
new
filter
143350.
C2
~~-
~
~~
G2
-,
J2
F2
Fig.
46.
Removing
Sewing
Hook (Correct Position
of
Thread
Guard
and
Bobbin
Case
Holder)
TO
REPLACE
THE
SEWING
HOOK
When
placing
a
new
sewing
hook
on
the
shaft,
have
the
sewing
hook
thread
guard
F2
at
the
bottom
and
the
bobbin
case
holder
G2
turned
to
the
position
shown
in
Fig.
46,
so
that
the
hook
will
clear
the
feed
bar
C2.
Place
the
hook
in
position
on
the
shaft
and
turn
the
bobbin
case
holder
G2
until
the
notch
J2
is
al
the
top.
Replace
the
bobbin
case
holder
position
bracket
E2,
Fig. 44,
making
certain
that
the
finger
K2,
Fig.
44
enters
the
notch
J2
(which
is
now
at
the
top
of
the
bobbin
case
holder.)
Then
securely
fasten
the
position
finger
by
means
of
the
screw
D2, Fig. 44.
Replace
the
needle.
Time
the
sewing
hook
as
instructed
on
pages
22
and
23.
Replace
the
bobbin
case
and
slide
plate.
33
TO REMOVE
AND
REPLACE
THE
HOOK
SHAFT
Remove
and
replace
the
hook
shaft
in
the
following
manner:-
1.
Remove
the
sewing
hook,
as
instructed
on
pages
31
and
32.
2.
Mark
the
two
lower
bevel
gears
L2
and
S4, Fig.
47,
with
chalk
or
crayon,
on
one
tooth
of
one
gear
and
the
corresponding
space
in
the
other
gear.
This
is
important,
as
these
gears
may
become
separated
during
removal
of
shaft.
These
marks
will
then
make
it
possible
to
obtain
the
original
relative
position
of
the
gears.
3.
While holding the
two
gears
L2
and
S4
in mesh,
as
instructed
in
Fig.
47,
loosen
the
two
set
screws
#1
and
#2
in
the
hook
shaft
bevel
gear,
withdraw
the
old
hook
shaft
and
insert
the
new
shaft.
N2
52;;:~
#2
VJ
Qi
/•1~
HOOK
sf,)f'iiiJJ
SHAFT
/._/
/L2
HOLD GEARS
IN
MESH
Fig.
47.
Removing
and
Replacing
Hook
Shaft
4.
Make
certain
that
set
screw
#1
(the
first
of
the
two
bevel
gear
set
screws
to
appear
as
the
machine
pulley
is
turned
over
toward
oper-
ator)
seats
over
flat
on
the
hook
shaft.
Remove
all
end
shake
from
hook
shaft,
by
pushing
hook
firmly
against
front
hook
shaft
bushing
and,
at
the
same
time,
pushing
gear
S4, Fig.
47
toward
the
hook
on
the
shaft.
Securely
tighten
first
set
screw
#1,
then
securely
tighten
the
second
screw
#2.
5.
Replace
the
sewing
hook,
as
instructed
on
page
32.
6.
Time
the
sewing
hook,
as
instructed
on
pages
22
and
23.
TO
REMOVE
THE
OIL PUMP
Remove
the
oil
pump
from
the
upright
arm
shaft,
in
the
following
manner:-
1. Loosen
the
two
oil
pipe
clamping
sleeve
nuts
S2,
Fig.
47.
2.
Remove
the
four
screws
N2,
Fig.
47.
3.
Remove
the
screen
frame,
screen
and
oil
pump
cover
02,
Fig.
47.