Singer 281-1 User manual

SINGER
281-1,-3-,21

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
Form 21288
... (264)
"'
. .,
...
SINGER*
Service Manual
Machines
281-1, 281-3 and 281-21
Regulation View - Machine 281-1
THE SINGER COMPANY
Copyright f 1964 by The Singer Company
Copyright Under International Copyright Union
Ali Rights Reserved under Infer-American Copyrigh• Union
*A Tradomor• of THE SINGER COMPANY
Printed in U. ~- A.

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
CONTENTS
DESCRIPTION
...........................................................
3
INSTALLATION
.........................................................
4
LUBRICATION
AND
CLEANING
................................
4, 5
OPERATION
..........................................................
4,
9
ADJUSTMENT
.....................................................
10,
16
PARTS
..................................................
Rear
of
Manual
INDEX
Babbin,
Removal
and
Replacement
.................................
8
Babbin
Case,
Removal
and
Replocement
..........................
8
Bobbin
Case,
Threoding
...............................................
8
Babbin
Case
Halder,
Removal
and
Replacement
..............
13
Centralizing
the
Feed
Dag
.....................................
l
5,
16
Check
Spring,
Height
Setting
.......................................
14
Check
Spring,
Tension
Adiustment
................................
14
Check
Spring,
Timing
.................................................
14
Cleaning
.............................................................
6,
13
Description
of
Machines
...............................................
3
Determining
Thread
Twist
............................................
7
Disc
Tension
.............................................................
3
Federal
Stitch
Type
••...........••..•..••.•.•••...••.•.•.•..•.•....•..•
3
Feed
Bar
Eccentric
Hinge
Pin
................................
14,
15
Feed
Bar
Linkage
....................................................
16
Feed
Dag,
Centralizing
.........................................
15,
16
Feed
Dog,
Height
Settings
.....................................
14,
15
Feed
Eccentric
Stop
Screws
Available
...........................
15
Feed
Leveling
..........................................................
15
Feed,
Pendant
Link
....................................................
3
Filter
(Sewing
Hook
Lubrication)
...................................
5
Guard.
Needle
..........................................................
13
Guard,
Needle
Thread
..................................................
3
Guide
Bracket
..........................................................
16
Hook
...................................................
(see
Sewing
Haak)
Haak
Section
............................................................
13
Installation
............................................................
4
Knee
Lifter
............................................................
3,
4
Length
of
Stitch
.................................................
3,
9,
10
Leveling
the
Feed
.....................................................
15
Lifting
Bracket
.........................................................
16
Lint
Wiper
......................................................
,
.........
3
Lower
Threading
........................................................
8
Lubricating
System
...................................................
3.5
Lubrication
...........................................................
4,
5
Machine
Base
............................................................
4
Machine
Pulley
..........................................................
3
Magnet
on
Oi
I
Pump
....................................................
6
Materials
Sewn
..........................................................
3
Maximum
Stitch
Length
...........................................
3,
15
Needle
Bar
Bushing
(Lower),
Setting
............................
.10
Needle
Bar
Height,
Setting
..........................................
10
Needle
Bar
Stroke
......................................................
3
Needle
Clearance
with
Hoak,
Setting
........................
11,
12
Needle
Guard
at
Loop-taking
Time
...............................
.13
Needle
Guard,
Stringing
..............................................
13
TO
ALL
WHOM
IT
MAY
CONCERN:
Needle
Recommended
..................................................
6
Needle,
Setting
.......................................................
6,
7
Needle
Stop
.............................................................
l 0
Needle
Thread
Guard
...................................................
3
Need
le
Threading
.......................................................
7
Oil
Flow
Regulator
.....................................................
5
Oil
Flaw
Windaw
.....................................................
3, 5
Oi
I
Pump
..............................................................
3,
6
Oi
I
Recommendations
..................................................
5
Oil
Reservoir
.........................................................
3,
4
Oil
Retaining
Callar
..................................................
11
Oil
Spray
Pattern
........................................................
5
Parts
Charts
...........................................
Rear
of
Manual
Pendant
Link
Feed
.....................................................
3
Presser
Bar
Height,
Setting
...••.••••.•••..••••.•.•.••...•••••••••••
16
Presser
Bar
Lift
...............................................•....
3,
16
Presser
Foat
Clearance
..............................................
16
Presser
Foot
Pressure,
Adiustment
.................................
9
Preventing
Unauthorized
Changes
in
Stitch
Length
...........
l
0
Position
Finger,
Settings
............................................
12
Radial
Position
of
Sewing
Hook
...................................
11
Regulator
Button
(Stitch
Length)
...............................
9,
10
Reservoir
..............................................................
3,
4
Sewing
Hook
Clearance
with
Needle,
Setting
..............
11,
12
Sewing
Haak
Filter
Screw
.............................................
5
Sewing
Hoak
Lubrication
.............................................
5
Sewing
Hook,
Oiling
Wick
.............................................
5
Sewing
Hook,
Timing
.................................................
11
Space
at
Right
of
Needle
.............................................
3
Speed
Recommendations
...............................................
6
Stitch
Length,
Maximum
..........................................
3,
15
Stitch
Length,
Preventing
Unauthorized
Changes
.............
l 0
Stitch
Length,
Regulation
........................................
9,
10
Stop
Screws
(Feed
Eccentric)
......................................
15
Stringing
the
Needle
Guard
..........................................
13
Take-up
Lever
Movement
............................................
14
Tension
of
Check
Spring,
Adjustment
............................
14
Thread
.....................................................................
7
Threading,
Lawer
......................................................
8
Threading,
Upper
........................................................
7
Thread
Tensions
........................................................
9
Timing
...............................................................
11,
14
Thread
Twist,
Determination
.........................................
7
Upper
Threading
.........................................................
7
Unauthorized
Changes
in
Stitch
Length,
Preventing
..........
l O
V.belt
......................................................................
3
Wick,
Sewing
Haak
......................................................
5
The
improper
placing
or
renewal
of
the
Trademark
SINGER'
or
any
other
of
the
Trademarks
of
The
Singer
Campany
(all
of
which
are
duly
Registered
Trademarks)
on
any
machine
that
has
been
repaired,
rebuilt,
reconditioned,
or
altered
in
any
way
whatsoever
outside
a
SINGER
factory
or
an
authorized
SINGER
agency
is
forbidden.
2

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DESCRIPTIOH OF MACHINES
Machines
281-1,
281-3
and
281-21
are
high
speed,
single
needle,
lockstitch
machines
designed
for
sewing
a
wide
variety
of
fabrics
ranging
from
light
weight
to
heavy
weight.
Outstanding
straight
line
stitching
is
produced
by
these
machines
in
materials
such
as
wash-and-wear,
synthetic
and
natural
fabrics.
General
Features
Balanced,
air
cooled,
rotating
hook.
Horizontal
axis.
Lint
wiper
keeps
lint
and
abrasive
matter
from
ac-
cumulating
on
hook.
Drop
feed
consisting
of
pendant
link
feed
with
feed
leveling
hinge
pin.
Pendant
link
feed
mechanism
maintains
longer
feed-
ing
cycle.
Three
plain
superfinished
bearings
support
the
arm
sh
aft.
Fully
automatic
lubricating
system
with
oil
flow
window
in
direct
view
of
operator.
Knee
lifter
mechanism
integral
with
machine
base
and
oil
reservoir.
Independent
light
fixture
mount.
Federal
stitch
type
301.
Improved
needle
thread
guard
and
other
thread
hand-
1
ing
parts.
Disc
tension.
Machine
pulley
147139
for
3/8
inch
V-belt.
Variations
of
Machine
Varieties
Machine
281-1
Light
weight
to
medium-heavy
weight
fabrics.
Needle
bar
stroke,
1-13/64
inches.
Presserbar
lift,
5/16
inch.
Maximum
stitch
length:
Feed
eccentric
stop
screw,
regularly
furnished,
I
imits
the
maximum
stitch
length
to
7
stitches
per
inch.
A
stop
screw
for
5-1/2
stitches
per
inch
will
be
furnished
when
specified
on
order.
Space
at
right
of
needle,
11
inches.
Machine
281-3
Light
weight
to
extra-heavy
weight
fabrics.
Needle
bar
stroke,
1-7/16
inches.
Presser
bar
lift:
Regularly
furnished
with
3/8
inch
I
ift
for
sewing
I
ight
weight
to
heavy
weight
fabrics.
Available
on
order
with
7/16
inch
lift
for
sewing
extra-heavy
weight
fabrics.
Maximum
stitch
length,
5-1 2
stitches
per
inch.
Space
at
right
of
needle,
11
inches.
Machine
281-21
Light
weight
to
medium-heavy
weight
fabrics.
Needle
bar
stroke,
1-13/64
inches.
Presser
bar
I
ift,
9/32
inch.
Maximum
stitch
length:
Feed
eccentric
stop
screw,
regularly
furnished,
limits
the
maximum
stitch
length
to
7
stitches
per
inch.
A
stop
screw
for
5-1/2
stitches
per
inch
will
be
furnished
when
specified
on
order.
Space
at
right
of
needle,
8
inches.
3

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
. .,,:.,'
,._,_, __ , __ L
GASKET
PLUNGER
HIGH MARK
OIL
RESERVOIR
LOW MARK
Fig. 2. Machine Base and Oil Reservoir
See that plunger is in place, as shown in Fig. 2,
before placing machine on base.
Machine base and oil reservoir fits into standard
table cut-out and rests on four corners without bolting.
Rasp edges of cut-out, shown in Fig. 2, if necessary,
so that machine does not touch table when placed on
base.
STOP SCREW
LOCK NUT ROCK SHAFT
KNEE PLATE
Fig. 3. Knee lifter
4
Use shims on corners, when required to insure that
base is level, so that oil level will be accurately in-
dicated by marks on base.
Machine head 1s not fastened but should rest on cork
gasket in base. Machine hinge pins must not support
the head except when machine is tilted back.
THE KN EE LIFTER
Knee lifter is shipped assembled to the base ex-
cept for the knee plate and I ifter lever.
Loosen the two clamp screws shown in Fig. 3 and
slide the rock shaft forward to position shown. Attach,
lifter lever.
Set the stop screw, Fig. 3, so that there is only a
little play in the lever before it start~ to lift the presser
bar. Then tighten lock nut on stop screw.
Set the rear stop dog to allow the presser bar to be
raised to its limit and tighten the two clamp screws.
CAUTION: Do not operate machine unti I it has been
thoroughly lubricated in accordance with the following
instructions.

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LUBRICATION
Before
starting
machine,
the
oil
reservoir
must
be
filled
to HIGH MARK
shown
in
Fig.
2
Use
SINGER
OIL
"TYPE
A"
or
"TYPE
C".
Use
"TYPE
C"
OIL
when
an
oil
is
desired
which
will
produce
a
minimum
of
stain
on
fabrics
even
after
a
long
period
of
storage.
Do
not
use
additives
in
sewing
machine
oil,
as
they
may
cause
a
reduction
in
normal
oil
flow
that
can
result
in
damage
to
machine.
Should
the
oil
flow,
passing
through
the
oil
How
window
as
shown
in
Fig.
4,
stop
or
become
erratic,
STOP
MACHINE
AND
DO
NOT
RUN AGAIN
unti
I
the
cause
has
been
eliminated.
Check
oi
I
level
often
to
keep
it
from
going
below
low
mark.
The
Oil
Flow
Regulator
Lubrication
of
the
sewing
hook
is
automatically
control
led
by
the
oil
flow
regulator
shown
in
Fig.
5.
Regulator
is
set
at
the
factory
for
lubrication
under
average
sewing
conditions.
To
determine
whether
oil
is
properly
flowing
to
the
hook,
run
machine
for
approximately
one
minute
to
es-
tablish
a
uniform
rate
of
flow.
Then
open
the
bed
slide,
hold
a
piece
of
paper
under
the
hook
and
run
the
ma-
chine
for
about
ten
seconds.
There
should
be
a
distinct
line
of
oil
on
paper,
beneath
the
hook
bearing,
with
a
fine
spray
on
each
side
of
this
line.
If
there
is
no
trace
of
oil
or
an
excess
of
oil
on
the
paper,
turn
oil
flow
regulator
to
right
or
left
to
increase
or
decrease
the
flow
of
oil,
as
shown
in
Fig.
5.
Machine
must
run
at
least
one
minute
between
ad-
justments
to
insure
uniform
oi
I
flow.
If
the
proper
rate
of
flow
cannot
be
obtained
by
turning
the
regulator
inspect
the
oil
flow
mechanism
as
fol
lows:
Remove
needle,
bobbin
and
bobbin
case
from ma-
chine.
Remove
bracket
screw
and
position
finger
shown
1n
Fig.
5.
Loosen
two
hook
body
screws
and
turn
machine
pulley
until
feed
bar
reaches
its
highest
point.
SHOULD
SHOW
STEADY
FLOW OF OIL
/\
\
Fig.
4.
Oi I
Flow
Window
THREAD
GUARD
HOOK
BODY
SCREWS
BRACKET
SCREW
OIL
FLOW
REGULATOR
Fig.
5.
Oi I
Flow
Regulator
SEWING
HOOK
OIL
FLOW
REGULATOR
-"\""
~~,
.,
fr--1
FILTER
SCREW
WICK
Fig.
6.
Sewing
Hook
Filter
Screw
and
Wick
Turn
the
sewing
hook
until
thread
guard
is
at
the
bottom
as
shown
in
Fig.
5
and
slide
hook
from
shaft.
Loosen
filter
screw
shown
in
Fig.
6
and
check
to
see
if
wick
has
become
detached
or
clogged.
Inspect
all
passages
for
dirt
and
lint
accumulation.
Replace
wick
if
necessary.
Assemble
sewing
hook
and
Position
finger
to
ma-
chine.
Re-check
01i
flow
as
previously
instructed.
5

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CLEANING
Using a short bristle brush (not point of scissors or
other sharp instrument), remove I int and other waste
from around sewing hook, from between feed rows and
underside of throat plate and from all other operating
points.
CLEAN
Tilt machine back on hinges. Wrap clean rag around
magnet, shown in Fig. 7, on oil pump body and pull
accu mu I ated foreign part ic I es from magnet.
Wipe exterior of machine dry with a soft cloth.
Fig. 7. Magnet on Oil Pump Body
SPEED
Maximum speed for machine 281-1 and 281-21 is
6000 stitches per minute.
Maximum speed for Machine 281-3 is 5000 stitches
Size of needle to be used should be determined by
weight of thread and type of material being sewn.
Orders for needles should specify quantity required,
size number and catalog number.
per minute. For example:
It is advisable to operate new machines at a speed 100 No. 16, Catalog 1361 Needles
of 500 stitches less than maximum, for the first 100
hours of operation.
NEEDLES
SETTING THE NEEDLE
Machines 281-1 and 281-3
Turn machine pu 11 ey over toward operator unt iI
Use SINGER* Needle, Catalog 1955, in sizes rang- needle bar reaches highest point as shown in Fig. 8.
ing from 8 to 22.
Machine 281-21
Use SINGER* Needle Catalog 1361, in sizes rang-
ing from 8 to 22.
6
Loosen needle clamping screw. Insert needle into
needle bar as for as it will go, with long groove of
needle to the left and eye of needle directly in line
with arm of machine. Then tighten the clamping screw.

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THREAD
Left
twist
thread
should
be
used
in
needle.
Either
right
or
left
twist
thread
may
be
used
in
bobbin.
Thread
twist
1s
determined
by
holding
thread
as
shown
in
Fig.
9
and
twirling
thread
over
toward
you.
If
left
twist,
strands
will
wind
tighter.
If
right
twist,
strands
will
unwind
or
separate.
Rough
or
uneven
thread,
or
thread
which
passes
through
needle
eye
with
difficulty,
will
interfere
with
successful
operation
of
the
machine.
UPPER
THREADING
Turn
machine
pulley
over
toward
operator
until
needle
bar
is
at
highest
point.
Pass
thread
through
threading
points
indicated
in
Fig.
10.
Draw
approximately
two
inches
of
thread
through
needle
eye
with
which
to
start
sewing.
\\
\\
·11
'·.
\~
..•
\ !, I
I /
.
•'·
:•
.
/
·~\
11
f I /
~
\/1
LL/,.
......
"'·
' !
2.
LOOSEN
l.
· ·
CLAMPING
SCREW
MOVE
TO
HIGHEST
POINT
LONG
GROOVE
3.
INSERT
NEEDLE
UP
,,
~
AS
FAR
AS
POSSIBLE
_::;.
'
\
\__
u;:):-,'---
~
Fig.
8. Setting the Needle
Fig.
9.
Determining Thread
Twist
Fig.
10.
Upper Threading
7

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
8
1. OPEN LATCH--,-,--~
2. HOLD LATCH ~(
AND PULL ,
CASE
FROM~~
HOOK
LOWER THREADING
Bobbin Removal
Turn machine pu 11 ey over toward operator unt iI
needle bar is at highest point.
Reach beneath bed of machine with left hand and
remove bobbin case from machine as shown in Fig. 11.
Release latch and bobbin will drop out of case, as
shown in Fig. 12.
Threading Bobbin Case
Fig. 11. Removing Bobbin Case
Hold bobbin so that thread will unwind in the direc-
tion shown in Fig. 13. Hold bobbin case as shown and
place bobbin into it.
3. RELEASE LATC~h Pull thread into slot and under tension spring,
shown in Fig. 14, so that thread enters delivery eye
at end of spring.
Bobbin Case Replacement
~
@'• BOBBIN DROPS OUT
Place bobbin case on center stud of bobbin case
holder and release latch. Place bobbin case back until
latch catches near end of stud as shown in Fig. 15.
Draw about two inches of thread from bobbin to start
the sewing.
Fig. 12. Removing Bobbin
SLOT NEAR TOP
I\~
f ''
Fig. 13. Replacing Wound Bobbin
1. HOLDING LATCH, REPLACE
I
I
~- I
: \,
! l
2. DRAW THREAD
DOWN AND
UNDER SPRING
Fig: 14. Threading Bobbin Case
2. RELEASE LATCH.
Fig. 15. Replacing Bobbin Case
3. PRESS BACK, UNTIL LATCH
CATCHES GROOVE IN STUD.

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ADJUSTING THE TENSION
Tension
on
thread
should
be
as
light
as
possible
while
still
sufficient
to
set
stitches
correctly
in
mate-
ria
I.
Regulate
needle
thread
tension,
as
instructed
in
Fig.
16.
Make
certain
presser
foot
Is
DOWN
during
tension
adjustment.
Tighten
lack
nut
to
maintain
tension
adjustment.
Regulate
bobbin
thread
tension
as
instructed
1n
Fig.
17.
ADJUSTING
THE
PRESSURE
Correct
presser
foot
pressure
helps
insure
proper
feeding
of
material.
Pressure
should
be
as
light
as
possible
while
still
sufficient
to
insure
correct
feeding
of
material.
Regulate
as
instructed
in
Fig.
18
with
presser
foot
down.
Pressure
regulating
thumb
screw
is
fitted
w,th
lock
nut.
Tighten
lock
nut
to
maintain
pressure
adjustment.
REGULATING
THE
STITCH
LENGTH
Changes
in
stitch
length
shou
Id
never
be
attempted
while
the
machine
is
running.
See
page
3
for
information
on
maximum
stitch
length
for
your
machine.
Regulate
the
stitch
length,
as
instructed
1n
Fig.
19.
Button
mentioned
in
Step
4,
Fig.
19,
drops
into
notch
with
an
audible
click.
MORE
TENSION
I
2.
TURN
,-
/
--",
THUMB
NUT
'
,
\\
, I
1.
LOOSEN/4
LOCK
NUT
\ \
\'
\ \ LESS TENSION
UJ
Fig.
16.
Needle
Thread Tension
Fig.
17.
Bobbin
Thread
Tension
~---2.
TURN
THUMB
SCREW
MORE PRESSURE
...
LESS
PRESSURE
1.
LOOSEN--_-~====,c:.,_=-_-_~~~1_-<-:,---_----
-,
\
Fig.
18.
Presser
Foot
Pressure
1.
STOP
MACHINE
2.
DEPRESS
BUTTON
l
4.
UNTIL
BUTTON
DROPS
INTO
NOTCH
3.
TURN
MACHINE
PULLEY
TOWARD
YOU
SLOWLY
5.
THEN
TURN
MACHINE
PULLEY
TO
DESIRED
STITCH
LENGTH
AND
RELEASE
BUTTON
Fig.
19.
Regulating
the
Stitch
Length
9

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
10
"
Fig. 20. Removing Stitch Length Regulator Button
BUSHING
SET SCREW
BAR BUSHING
2.312" (281-1, 281-21)
THROAT PLATE 2.599" (281-3)
c=sE=A=T-=--=---=~--=~--=~-~~1;:=~=::::::::===-::::-il ______ _
Fig. 21. Correct Setting: Needle Bar Bushing
CLAMPING
SCREW
--...-
~-:
~- ~
! ,.,,. ,cr=="-1_-=c....vl
l
i
!:
!
UPPER
TIMING
MARK
THROAT PLATE 1!21
SEAT l '(, .. 1.031" (281-1, 281-3)
_ ~-1.-:: 0.866" (281-21)
C f I , -- -
Fig. 22. Correct Height: Need! e Bar
Stitch regulator button may be removed by loosening
the four screws and removing arm top cover, shown in
Fig. 20.
Remove retaining ring near tip of button allowing
button to be withdrawn.
Hole in top cover should then be filled by inserting
plug screw 140607 which may be obtained at additional
charge.
Replace arm top cover.
Inspect and adjust the machine, when it is required,
in the order given.
SETTING THE LOWER NEEDLE BAR
BUSHING
Gauge distance from throat plate seat to bottom of
lower needle bar bushing, as shown in Fig. 21, is ---
2.312 inches for Machines 281-l and 281-21.
2.599 inches for Machine 281-3.
Raise or lower needle bar bushing, as required to
obtain correct height setting, after loosening bushing
set screw shown in Fig. 21.
SETTING THE NEEDLE BAR HEIGHT
Remove face plate, slide plate and throat plate.
When needle bar is at its lowest point (during rota-
tion of machine pulley), the gauge distance from throat
plate seat to needle stop in needle bar, as shown in
Fig. 22, is ---
l.031 inches for Machines 281- l and 281-3.
0.866 inch for Machine 281-21.
When needle bar is set at correct height, UPPER
TIMING MARK on needle bar will be level with bot--
tom of lower needle bar bushing.
To set needle bar height, remove face plate, slide
pI ate and throat plate from machine. Loo sen need Ie bar
clamping screw shown in Fig. 22. Raise or lower
needle bar as may be required. Securely tighten clamp-
ing screw. Replace all other parts previously removed.

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
TIMING THE MACHINE
Timing
the
machine
consists
of
first
adjusting
the
radial
position
of
sewing
hook
with
relation
to
move-
ment
of
needle
bar
and
needle
thread
toke-up
lever,
to
make
certain
that
loop
of
thread
formed
by
needle
will
be
correctly
token
by
point
of
hook
at
proper
time.
The
check
spring
and
feed
ore
then
timed
to
syn-
chronize
their
motions
with
needle
and
hook
movement.
TIMING THE
SEWING
HOOK
Remove
slide
plate,
throat
plate,
presser
foot
and
feed
dog.
Turn
machine
pulley
over
toward
operator
unti I
needle
bar
reaches
its
lowest
point
and
rises
to
posi-
tion
where
LOWER
TIMING MARK
on
needle
bor
is
level
with
bottom
of
lower
needle
bar
bushing,
as
shown
1n
Fig.
23.
At
this
pos1t1on,
point
of
sewing
hook
should
be
at
center
of
needle,
as
shown
in
inset,
in
Fig.
23.
Loosen
two
hook
body
screws
shown
and
turn
hook
on
shaft
as
required
to
bring
point
of
hook
to
center
of
needle.
See
Fig.
24.
Make
certain
thot
hub
of
hook
1s
against
oil re-
taining
col
lor
and
tighten
hook
body
screws.
Check
clearance
between
needle
and
hook
point,
in
occc•donce
with
the
following
instructions.
SEl;TING THE CLEARANCE BETWEEN
NEEDLE
AND HOOK POINT
Check
to
see
that
needle
is
properly
seated
in
needle
bar
and
time
sewing
hook
as
previously
in-
structed.
Point
of
sewing
hook
should
poss
needle
as
closely
as
possible
without
striking
or
deflecting
needle.
A
clearance
of
about
the
thickness
of a
piece
of
note
paper
(approximately
.005
inch),
as
shown
in
Fig.
25,
is
sufficient.
EYE
CLEARANCE
ABOVE
EYE
.z~---,
I
;=-_,_-_-
!
I
~
'---"
HOOK
-/
'4fl'-
LOWER
TIMING
MARK
LEVEL
WITH
BOTTOM
OF
LOWER
NEEDLE
BAR
BUSHING
POI
NT
Fig.
23.
Hook
Point
at Center
of
Needle
Fig.
24.
Hook Body
Screws
I
I~
I '
I
NOTE-PAPER
,l
-rl
{711\\
/
~
"
I \ -
\_
/
-~.,
•,_JI
J.~)y"
®
.i
Fig.
25.
Clearance
Between
Needle
and Hook
11

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
SETTING THE CLEARANCE BETWEEN
NEEDLE AND HOOK POINT (Continued)
To move hook point toward or away from needle,
first remove slide plate, throat plate and bobbin case.
Then, loosen the two bevel gear screws shown in Fig.
26 and loosen bushing set screw shown in Fig. 27.
MAKE CERTAIN THAT BEVEL GEARS ARE
KEPT IN MESH CONSTANTLY UNTIL THEIR SCREWS
ARE SECURELY RETIGHTENED.
12
Fig. 26. Bevel Gear Screws
Fig. 27. Position of Drift Pin when
Moving Hook
Toward Needle
BOBBIN
CASE
HO LOER ------1
POSITION~
FINGER
.018" TO .022"
CLEARANCE
POSITION
FINGER
(})~SCREW
Fig. 29. Position Finger
Using a I ight mallet and a 1/4 inch brass drift pin,
move hook assembly toward or away from needle as
required. Figs. 27 and 28 show correct placement of
drift pir.. TAP VERY LIGHTLY to avoid damaging
hook assembly.
Securely tighten bushing set screw.
Remove all end play from hook shaft by moving
hook assembly firmly against front hook shaft bushing
and, at the same time, moving hook shaft ·bevel gear
toward sewing hook end of shaft.
Tighten screw l, Fig. 26, on bevel gear. Securely
tighten bevel gear screw 2, Fig. 26.
Replace all parts previously removed.
C~eck thread clearance between position finger
and !Jobbin case, as instructed next.
0:[\ \ '~ , LOO SEN
if\r \l ,1" BusH1NG
\~' ._ j ~?....JW SET SCREW
'----------''v~ di , ,:, ~
i' ~~, ::::::::-; ' ~
I ' ~ )LJ) I /. ~:i
I ;-$ f(,I~~
1',J: ~/
TAP VERY• J'~/ / ~ '--._,
1 1
IK'~
LIGHTLY-+ i '1>\~.1. LJ / \. ~QI~~
A WAY G ~7-·:::;::;/,,,;/ j Ir r
FROMNEEDL;-\\~~•( -·~
1/4
1
" BRASS
I)~ \ DO NOT
DRIFT PIN .d I/~, • HIT
~= ~·~. BRIDGE
Fig. 28. Position of Drift Pin when
Moving Hook Away from Needle
SETTING THE POSITION FINGER
Clearance between position finger and bobbin case
holder should be just sufficient to allow thread to pass
through easily. Normally an .018 to .022 inch clear·
ance, as shown in Fig. 29, is required. If necessary,
bend position finger CAREFULLY to achieve this
setting.
Top surface of the position finger must be kept
level with the top surface of the bobbin Cose holder.

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
STRINGING
THE
NEEDLE
GUARD
BOBBIN-
CASE
HOLDER
A
HOOK
POINT
NEEDLE
GUARD
-·
-
- . '
LARGE
·,v.
::
!!
.,
B
Incorrect:
Stringing
Required
;1
BOBBIN
--~-
------=-.:
CASE
...
:
ilJ
]
HOLDER
ilJ
____
_
Correct
L;
~
ll_~
.
Relationship
~
HOOK
POINT
NEEDLE
GUARD
Fig.
30.
Needle
Guard
at
Loop-Taking
Time
The
need
le
guard
on
the
bobbin
case
holder,
shown
1n
Figs.
30
and
33,
should
prevent
needle
from
con·
tacting
hook
or
bobbin
case
at
any
time.
See
Fig.
30
(A) for
correct
relationship.
When
large
needles
(size
20
or
larger)
are
used,
needle
guard
may
deflect
needle
too
far
toward
left
resulting
in
damage
to
needle.
See
Fig.
30
(B).
To
avoid
this,
it
may
be
necessary
to
string
the
needle
guard
in
accordance
with
the
follow-
ing
instructions.
Remove
needle,
slide
plate,
throat
plate
and
bobbin
case
from
machine.
Turn
machine
pulley
until
feed
bar,
Fig.
31,
is
at
its
highest
point.
Remove
position
finger
shown
in
Figs.
29
and
31.
Turn
hook
body
to
position
shown
in
Fig.
31
and
remove
three
small
screws
and
hook
section
shown.
Turn
bobbin
case
holder
until
position
finger
slot
on
thread
guard
is
at
location
shown
in
Fig.
32
Slip
bobbin
case
holder
out
of
hook
body.
Remove
a
slight
amount
of
metal
from
needle
guard
by
rubbing
needle
guard
along
a
l/8
inch
strip
of
very
fine
emery
cloth,
as
shown
in
Fig.
33.
EXTREME
CARE
should
be
taken
to
avoid
removal
of
too
much
metal
as
this
may
permit
needle
to
strike
hook.
See
Fig.
30
(C).
Bobbin
case
holder
wil
I
then
need
rep
Ia
cement.
Clean
bobbin
case
holder
thoroughly
before
re-
placing
it
in
hook
body.
Replace
al I
parts
in
reverse
order
instructed
for
removal.
HOOK
POINT
HOOK
SECTION
Fig.
31.
Hook
Section
Fig.
33. Stringing Needle Guard
13

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
SETTING
THE
CHECK SPRIHG HEIGHT
Thread
the
machine.
Turn
machine
pulley
over
slowly
toward
operator,
observing
check
spring
shown
1n
Fig.
34.
When
take-up
lever
begins
to
rise,
::heck
spring
should
make
a
slight
dip
and
return
to
its
higher
posi-
tion.
As
take-up
lever
approaches
top
of
its
stroke,
set-
ting
the
stitch,
check
spring
should
be
drawn
all
the
way
down.
14
Fig.
34.
Check Spring
FEED
DOG
TEETH
1/32"
FOR "WASH AND
WEAR"
PARALLEL
TO
~J.~;~~~~~~N~~J~~~~~~~~~-~~=-
-r----------
------
---
-----:,
-
~-;"'z~
3/64"
FOR
ALL
OTHER
MATERIALS
PLATE
Fig.
35.
Correct
Height
of
Feed
Dog
HINGE
PIN
ECCENTRIC
HINGE
PIN
ECCENTRIC
SET
FOR
3/64"
RISE
SET
FOR
L32"
RISE
Fig.
36.
Feed
Bar
Hinge
Pin
(Eccentric)
As
take-up
lever
descends,
check
spring
should
return
to
rest.
To
increase
or
decrease
height
of
check
spring
(which
respectively
increases
or
decreases
its
move-
ment),
loosen
stud
set
screw
shown
in
Fig.
34.
Turn
stud
along
with
entire
check
spring
assembly
to
set
check
spring
height
as
required.
Securely
tighten
set
screw.
NOTE:
Height
setting
should
be
checked
each
time
a
different
presser
foot
is
used
with
machine.
SETTING THE CHECK SPRING TENSION
Tension
on
check
spring
should
be
sufficient
to
insure
action
at
top
speed
but
light
enough
to
allow
check
spring
to
be
drawn
al
I
the
way
down.
To
adjust,
first
make
certain
that
stud
set
screw
shown
in
Fig.
34
is
securely
tightened.
Then,
using
a
screwdriver
in
slot
of
stud,
turn
stud
alone
toward
left
to
decrease
tension
or
toward
right
to
increase
tension.
SETTING
THE
FEED
DOG
HEIGHT
Feed
dog
height
should
be
adjusted
with
machine
set
for
longest
stitch.
ALL
the
teeth
of
the
feed
dog
should
rise
equally
high
above
the
throat
plate,
as
shown
in
Fig.
35.
The
correct
height
of
feed
dog
for
wash
and
wear
fabrics
is
L
32
inch
above
throat
plate.
For
all
other
fabrics
the
correct
height
is
3,64
inch
above
throat
plate.
To
set
feed
dog
at
correct
height,
loosen
the
two
hex-head
screws
shown
in
Fig.
37.
To
obtain
a
height
of
3/64
inch
above
throat
plate,
turn
hinge
pin
eccentric,
Fig.
36,
until
flat
on
slotted
end
is
at
top
as
shown.
To
obtain
a
height
of
Li32
inch
above
throat
plate,
turn
hinge
pin
eccentric
until
flat
is
at
bottom.
To
raise
or
lower
the
REAR
END
of
feed
dog,
turn
hinge
pin
eccentric
out
of
set
position,
as
required.

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
SETTING THE FEED
DOG
HEIGHT
(Continued)
If
desired
height
cannot
be
obtained
as
previously
stated,
loosen
clamp
screw
on
crank
shown
in
Fig.
37.
Raise
or
lower
feed
bar
as
required
to
obtain
desired
height.
Securely
tighten
clamp
screw.
Level
the
feed
dog
by
means
of
hinge
pin
eccentric
as
previously
instructed.
Securely
tighten
the
two
hex-
head
screws
shown
in
Fig
..
37.
NOTE:
Variations
in
feed
dog
height
may
sometimes
be
necessary
to
balance
height
in
relation
to
presser
foot
pressure.
AVAILABLE
FEED
ECCENTRIC
STOP
SCREWS
Machine
is
prevented
from
making
longer
stitches
than
o
predetermined
maximum
by a
stop
screw
shown
1n
Fig.
38,
in
the
feed
eccentric.
The
fol
lowing
stop
screws
are
available
for
these
machines:
140256, 7
stitches
per
inch
140257,
5Vi
stitches
per
inch
140258,
14
stitches
per
inch
140568, 8
stitches
per
inch
CENTRALIZING
THE
FEED
DOG
Feed
dog
shou
Id
never
contact
edges
of
throat
plate
but
should
move
midway
between
sides
of
throat
plate
slots
and
maintain
its
movement
equidistant
from'front
and
rear
edges
of
throat
plate
slots.
Sidewise
Setting
To
move
feed
dog
toward
left
or
right,
loosen
the
two
clamp
screws
on
feed
bar
carrier
and
the
clamp
screw
on
feed
bar
crank,
shown
in
Fig.
39.
Move
feed
bar
as
required
to
position
feed
dog
mid-
way
between
sides
of
throat
plate
slots~
Make
certain
that
feed
dog
height
is
correct
as
in-
structed
previously.
Securely
tighten
all
three
clamp
screws.
Fig.
37.
Feed
Bar
and
Crank
FEED
ECCENTRIC
VL
STOP
SCREW
Fig.
38.
Feed
Eccentric
Stop
Screw
TWO
CLAMP
SCREWS
FEED
BAR
CARRIER
Fig.
39.
Centralizing
the
Feed
Dog
15

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
CENTRALIZING
THE
F EEO
DOG
(Continued)
Lengthwise
Setting
Set
machine
for
longest
stitch
and
loosen
hex-head
screw,
shown
in
Fig.
40,
on
rock
shaft.
Move
feed
bar
carrier
and
rock
shaft
so
that
move-
ment
of
feed
dog
is
equidistant
from
front
and
rear
edges
of
throat
plate
slots.
Securely
tighten
hex-head
screw.
Check
linkage
for
freedom
of
movement
to
reduce
wear
and
insure
maximum
efficiency.
FEED
BAR
CARRIER
ROCK
SHAFT
HEX-HEAD
SCREW
Fig.
40.
Feed
Bar
Linkage
SETTING
THE
PRESSER BAR
HEIGHT
When
presser
foot
rests
firmly
on
throat
plate,
with
feed
dog
below
throat
plate,
there
shou
Id
be
a s I
ight
clearance
between
guide
and
lifting
bracket,
shown
in
Fig.
41.
When
presser
foot
is
raised
to
highest
point
and
needle
bar
is
at
bottom
of
its
stroke,
top
of
presser
foot
should
not
contact
needle
bar.
To
adjust
for
clearance
between
guide
bracket
and
Ii
ft ing
bracket,
remove
large
pIug from
face
pI
ate
and
loosen
clamp
screw
thus
made
accessible.
This
clamp
screw
is
shown
in
Fig.
41.
Face
plate
1s
removed
in
this
illustration
only
to
show
entire
presser
bar
assembly.
Raise
or
lower
guide
bracket
as
required.
Make
certain
that
presser
bar
is
correctly
turned,
with
needle
centered
in
needle
slot
!or
between
the
toes)
of
presser
foot
then
securely
tighten
clamp
screw.
16
CAUTION:
Whenever
guide
bracket
has
been
moved
on
presser
bar,
inspect
the
check
spring
for
correct
setting
as
previously
instructed.
CLAMP
SCREW
BRACKET
BRACKET
Fig.
41.
Presser
Bar
Assembly
I