Singer 246K43 Troubleshooting guide

SINGER
246K42, 246K43 AND 246K45

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
(961)
SERVICE
MANUAL
AND
PARTS
LIST
FOR
SINGER*
OVEREDGING MACHINES
246k42,
246k4
3
and
246k45
Machine
246K42
CAUTION-See
that
machine
reservoir
is
filled
with
oil,
as
instructed
on
page
6
before
using
machine.
Copyright
Under
International
Copyright
Union
THE
SINGER
MANUFACTURING
COMPANY
*A
Trademark
of
THE
SINGER
MANUFACTURING
COMPANY
Printed
in
Great
Britain

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
CONTENTS
DESCRIPTION
SETTING
UP
LUBRICATION
INFORMATION
FOR
OPERATOR
ADJUSTMENTS
PARTS
LIST
Page
3,4
5
6
6-13
14-25
27
Page
PARTS,
COMPLETE
FOR
246K42
MACHINE
...
31
PARTS
SPECIAL
TO
246
K43
MACH
IN
E
......
.40
PARTS
SPECIAL
TO
246K45
MACHINE
.......
43
FITTINGS
...............................................
.46
ACCESSORIES
..........................................
54
NUMERICAL
LIST
OF
PARTS
.....................
57
INDEX
Accessories
to
Machines
Angular
Adjustment,
Stationary
Knife
Bight
Adjustment
Page
3
24
23,24
•
Cleaning
6,
25
Clearance
between
Looper
Carrier
Connection
and
Guide
Bar
Bracket
20
Contact
Point
of
Knives
23
Curvature
of
Needle
Blade
7
Description
of
Oil
Inside
Front
Cover
Differential
Feed
14
Drop
Feed
14
Edge
Guide,
Swing
Out
14
Feed
Controls
14,
15
Feed Dogs,
Setting
16
Feed Dogs,.
Tilting
16
Feed Eccentrics,
Changing
15
Feed Eccentric
Extractor
l
64203
l 4
Feed Eccentrics, Sizes
Recommended
Foot
Lifter
Formation
of
Stitches
Gathering
Gauge
164460
Gauge
164592
Knife
Grinder
701-9
Knife
Sharpening
Knives,
Removal
and
Replacement
Left Looper,
Setting
Length
of
Stitch
Looper
Thread
Eyelet,
Setting
Looper
Thread
Stripper
Looper
Thread
Take-up,
Adjustments
Machine
Pulley
Movable
Knife
Needle
Clamp,
Setting
14
3, 5
4
15
16
to
21
16
to
21
25
25
23
19
14,
15
22
22
22
3,5,
25
23-25
17
2
Needle
Curvature
Gauge
164588
Needle
Guard
Needle,
Setting
Needles
Needles
and
Thread
Needle
Thread
Controller,
Setting
Oil
Flow
Adjustment
in
Looper
Mechanism
Preparation
for
Threading
Page
7
24
8
3, 7
7
l 8
6
8
13,
25
13
21
20,
21
Pressure
of
Presser Foot
Regulation
Right
Looper,
Installing
Right
Looper,
Setting
Running-in
Machine
Sharpening
Knives
Speed
Spreader,
Installing
Spreader,
Setting
Stationary
Knife
Stitch
Formation
Stitch
Length,
Regulating
Stitch Types
Stretching
Stripper
Suggestions
for
Efficient
Operation
Take-up,
Adjustments
Threading
Threading
Wire
164196
Thread
Tensions,
Regulating
Tools
Trimmer,
Adjustments
Unwinder
Width
of
Bight
X-ray
View
of
Machine
6
25
7
21
20,21
23-25
4
14,
15
3, 4,
10-12
l 5
22
25
22
9-12
3,10,12
13,
25
3
23,24
3, 9
23,
24
3

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DESCRIPTION
Fig. 2.
X-ray
View
of Class
246K
Machine
(Lubricating System Shown in Solid Black)
Machines
246K42,
246K43
and
246K45
pro-
duce
high
speed
overedging
and
simultaneous
trimming
on
materials
ranging
from
lace
to
canvas.
Available
for
single needle
operations,
these
powerful
but
compact
machines
are
capable
of
producing
three
different
overedge
stitches.
Stitch
Types
503,
504
and
505.
Adaptable
for
gathering,
stretching
or
feeding
the
work
uniformly,
these
machines
of
C:lass
246K
have
proven
themselves
in
an
almost
endless
list
of
overedge
operations
including
serging,
inter-
mittent
gathering,
ruffling,
binding,
scalloping,
cuffing,
side-seaming,
yoking,
closing,
cording,
welting
and
inserting.
GENERAL CHARACTERISTICS
Curved needles:
Catalogue
#
1265
(151 x 7)
regular,
Catalogue#l263
(151 x 3)
tapered
blade.
Loopers (or
looper
and
spreader)
independently
driven,
permitting
variations
in
their
adjustment
in
relation
to
each
other
and
to
the
needle,
to
suit
the
work
required.
Either left or right twist of thread
may
be
used
in
needle
and
in
loopers.
Adjustable trimmer
cuts
cleanly;
operating
in
advance
of
needles.
Trimmings
guided
into
chip
chute
to
avoid
interference
with
work
and
with
mechanism.
Presser
foot
can
be
swung
toward
left
to
facili-
tate
threading
or
replacement
of
needle.
3
Tubular operation
is
accommodated
by
a
small
"horn"
extension
of
the
throat
plate
support.
Cloth plate
can
be
swung
to
the
left
for
con-
venience,
when
stitching
tubular
pieces
or
when
making
machine
adjustments.
Fittings for Machine
246K42
are
designed
to
retain
control
of
thread-chain
as
long
as
presser
foot
is
engaged
with
feed
dog,
enabling
operator
to
break
the
thread
chain
manually,
without
losing
control
of
chain
or
distorting
the
thread
loops.
Splash lubricating system,
shown
in Fig. 2,
automatically
and
continuously
oils
principal
bear-
ings
during
operation.
Oil cooling reservoir
in
rear
of
machine.
Oil level indicator
gauge
in
direct
view
of
operator.
Oils
recommended,
see
inside
front
cover.
Machine pulley
164231
for
3/8
inch
Y-belt;
also
used
for
5/16
inch
round
belt.
Machine pulley should
always
turn over
away
from operator
when
machine
is
in
motion.
ACCESSORIES
AND
TOOLS
Foot
lifter.
Knee
lifter
supplied
instead,
when
specified
on
order
..
Threading
wire
164196.
Tweezers
164204.
Socket wrench
164197
(for
needle
clamping
nut).
Flat, open-end wrench l
0875
(for
feed
eccentric
nut).
Screwdriver
85318.
Wrench
164831
(for
right
looper
carrier
guide
bar
oil
plug
screw
nut).
Thread unwinder
15103
l
(for
two-
or
three-
thread).
Thread unwinder
228705
(two-thread)
or
228706
(three-thread)
for
nylon
threads
will
be
supplied
instead
of
regular
unwinder,
upon
spe-
cific
order.

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
SPECIAL
FEATURES
.Machine
246K42
...
pants serging
...
light
and
medium
weight
fabrics
...
drop feed
...
one needle,
one
looper,
one
spreader
...
two-thread
serging
stitch
(Stitch Type
#503,
shown
in
Fig. 3).
See
page
12
for
instructions
on
threading
.
. . . trimmer
adjustable
to
cut
1/
16
inch
to
1/ 4
inch
from
needle
...
bight limit,
l /
16
inch
to
7
/32
inch
...
feed eccentric
164915,
bronze,
regularly
sup-
plied
for
5
stitches
to
the
inch.
...
maximum
speed
6000
stitches
per
minute
Machine
246K43
...
general overedging;
gathering,
stretching
or
uniform feeding
...
light
and
medium
weight
fabrics
...
differential feed
...
one needle,
two
loopers
...
three-thread tight needle
thread
stitch
(Stitch
Type
#504
shown
in Fig. 4).
See
pages l 0
and
11
for
instructions
on
threading.
...
machine
is
frequently
fitted
to
produce
the
three-thread
purl-on-the-edge
stitch
(Stitch
Type
#505
shown
in
Fig. 5), upon specific
order.
See
page
11
for
instructions
on
threading.
4
Fig. 3 Stitch
Formation
(Stitch
Type
#503)
El
7310
Fig.
4.
Stitch
Formation
(Stitch
Type
#504)
~==~
"r.:~==2'~a'===;;"."y--
" I
~·~~
.....:::..,..-~
~~d~~kl~~~~~
..._,-...::;
"'-./:::::;:::::;
c=:.::::
.....,::s::::s
EZ,'3!/
Fig. 5. Stitch
Formation
(Stitch
Type
#505)
...
trimmer
adjustable
to
cut
1/16
to
1/4
inch
from
needle
...
bight
limit,
1/
16
inch
to
7
/32
inch
...
two
feed eccentrics
164915,
bronze,
regularly
supplied
for
14
stitches
to
the
inch
...
maximum
speed,
6000
stitches
per
minute
Machine
246K45
Similar to
Machine
246K43,
except-
...
more
looper
stroke,
higher
feed
lift, higher
knife
stroke
...
adapted
for
medium
and
medium
-
heavy
weight
fabrics
...
trimmer
adjustable
to
cut
l
/8
to
l /
4 inch
from
needle
...
bight limit,
l
/8
inch
to
l
/4
inch
.
..
Maximum
speed
5500
stitches
per
minute

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INSTALLATION OF
MACHINE
AND
BASE
ON
TABLE
#6
Drill
Hole
(¾
inch
Diameter)
BELT
GUARD
Flat
Head
to
Accommodate
Chain
for
Presser
1 inch
Wood
Screws
~
#.~~~!-,.~•i.!~~g
Lever
.v
#8
Round Head
¾
Inch
Wood Screws
#7
Flat Head
¾ Inch Wood Screws
Fig. 6.
Machine
Base on Table, Showing Position
and
Drill Sizes
of
Holes Required
for
Installation
Place
machine
and
base
on
table
top
with
belt
groove
of
machine
pulley
in
line
with
belt
groove
of
driving
pulley.
Spot
position
of
hole
behind
machine
base,
di-
rectly
below
chain
slot
on
presser
foot
lifting
lever.
Remove
machine
from
base.
Draw
outline
of
machine
base
in
position
on
top
of
table.
Drill
hole
spotted
earlier,
3/
4
inch in
diameter,
to
accommodate
chain.
Using
base
and
belt
guard
as
template,
spot
and
drill six
holes
in
table
for
wood
screws,
as
shown
in
Fig. 6.
Fasten
machine
base
and
belt
guard
to
table
with
the
six
wood
screws,
described
in Fig.
6.
Set
machine
on
rubber
cushions
at
four
corners
of
base.
FOOT
LIFTER:
As
the
stand
recommended
for
Class
246K
Machines
with
foot
lifter
includes
a
suitable
foot
lifter
treadle,
foot
lifter
chain
6439,
without
the
treadle,
will
be
sent
with
the
machine.
If,
however,
the
machine
is
fitted
to
a
stand
or
other
equipment
which
does
not
have
a
suitable
treadle,
orders
should
state
that
foot
lifter
treadle
4885
is
required
and
it will
also
be
supplied,
with-
out
extra
charge.
CAUTION
All of the oil
is
drained from the machine before it
is
shipped from the factory.
DO
NOT
START
THE
MACHINE
UNTIL
IT
HAS
BEEN
THOROUGHLY
LUBRICATED
AS
INSTRUCTED
ON
PAGE
6.
5

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LUBRICATION
HS
~
f
as
Pour "TYPE A" or "TYPE C"
OIL into Oil Filler Cup
~
Keep
Oil in
~ght Gaug~at
,, FULL'' MARK
Check
-
~ Oil Level
~"-DAILY
BEFORE STARTING MACHINE
Fig. 7. Filling Oil Reservoir
Use "TYPE A" or "TYPE C" OIL, sold by
Singer Sewing Machine Company.
Apply this oil to oil filler cup on top of machine,
pouring oil into reservoir until oil in the sight
gauge is at "FULL" mark, as indicated in Fig. 7.
Check oil sight gauge daily before starting
machine
and oil machine, when necessary, as
instructed in Fig. 7 above.
WHEN A MACHINE HAS BEEN IDLE FOR A CON-
SIDERABLE TIME (OR AFTER A MAJOR INSTALLA-
TION OF PARTS}. Clean the machine thoroughly.
Then apply a few drops of oil to oil grooves of
feed bar connections QS (see inset at bottom left
of Fig. 7) and to looper carrier connection guide
bar at 02, Fig. 8 behind upper knife carrier and
chip guard. Apply a drop of oil to presser bar at
HS, Fig. 7. Check oil level in reservoir, as instructed
in Fig. 7.
AFTER MACHINE IS INSTALLED AND BEFORE
STARTING THE MACHINE:
Remove the chip guard from the front of the
machine.
6
Fig. 8. Oil Flow Adjustment
Check the oil flow on right hand looper carrier
connection guide bar at 02, Fig. 8.
To adjust amount of oil flow on guide bar
at 02, loosen lock nut DS and turn adjusting screw
LS, Fig. 8 clockwise as far as possible. Oil flow is
now shut off, completely.
Back off screw LS (turning screw anti-clockwise)
l /2 turn. Check lubrication again.
To increase oil flow, turn screw LS anti-clock-
wise a small amount and recheck lubrication.
If oil flow is too great turn screw LS clockwise
about 1/4 turn and recheck.
Never operate machine when oil flow is SHUT
OFF
at LS.
When correct oil flow is obtained, lock the nut
DS, Fig. 8. Replace the chip guard.
Remove belt and check freeness of machine by
turning machine pulley by hand. Replace belt.
Finally, "run-in" the machine for approximately
15 minutes at a moderate speed.

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
SPEED
MAXIMUM
SPEEDt Speed
recommended
(Stitches
per
for
Long Runs
or
while
MACHINE
minute)
sewing
long stitches
246K42 6000 5500
246K43 6000 5500
246K45 5500 5000
tMaximum
efficient
speed
is
dependent
upon
the
ability
of
the
operator,
the
nature
of
the
operation
and
the
type
of
material
being
sewn.
It
is
advisable
to
operate
these
machines
at
more
moderate
speeds
the
first
few
days,
after
which
they
can
be
run
at
top
speed.
When
the
machine
is
in
operation,
top
of
ma-
chine
pulley
must
always
turn
over
away
from
operator.
NEEDLES
AND
THREAD
Needles
are
of
curved
blade,
Catalogue
#1265
(151
x
7)
regular,
in
sizes
9
to
12, 14,
16,
18,
19
and
21.
Needles
of
Catalogue#l263
(151
x
3)
with
tapered
blade,
in
sizes
5, 6, 7, 9
and
11
are
available.
Selection of needles
can
make
a
great
differ-
ence
in
the
ease
and
quality
of
the
work.
It
is
im-
portant
that
each
needle
be
just
right
for
machine,
thread
and
work
being
done.
Choose your needle carefully.
The
correct
size
will
permit
~hread
to
pass
freely
through
needle
eye;
avoiding
strain
and
breakage
of
thread.
Either
right
twist
or
left
twist
thread
may
be
used.
If
trouble occurs during sewing:
Inspect
needle
point.
A
hook
or
burr
may
cause
poor
stitching
or
some
materials
may
be
cut
when
short
stitches
are
used.
Check curvature
of
each
needle,
as
instructed
below.
Unless
the
needle
has
the
correct
curva-
ture,
it
may
cause
skipping
of
stitches.
Orders
for
needles
must
specify
the
Quantity
required,
the
Size
number,
also
the
Catalogue
number
...
For
example
...
"100Size9,
Catalogue-#=1265(151 x
7)
Needles."
The
best
stitching
results
will
be
obtained
when
using
needles
sold
by
Singer
Sewing
Machine
Company.
CURVATURE
OF
NEEDLE
BLADE
(Gauge
164588,
for
needles
of
Sizes
7
to 16
only)
E2282..
Fig. 9. Checking
Needle
Curvature
7
Before
making
any
stitching adjustments,
the
curvature
of
each
needle
blade
should
be
checked
in
the
following
manner:
Using
Gauge
164588,
shown
in
Fig.
9,
insert
shank
of
needle,
with
its
flat
side up,
in
the
groove
A.
Push
the
needle along
the
groove
as
far
as
it
will
go
against
stop
B.
Tighten
clamping
screw
C.
Swing
the
indicator
D,
slowly
to
and
fro,
along
the
curve
of
the
needle
blade,
observing
the
dis-
tance
between
the
needle
blade
and
the
tip
of
the
indicator.
The
tip
of
the
indicator
should
just
make
con-
tact
at
the
needle
eye
and
should
clear
needle
blade,
at
upper
end
of
curve,
by
approximately
.005
to
.006
inch. Use
feeler
gauge.
Reject
any
needle
that
cannot pass this test.

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SETTING THE NEEDLE
Move needle clamp up to its highest position.
Insert needle, as instructed in Steps 1 to 5 in
Fig. 10.
When needle is correctly inserted in needle
clamp, securely tighten needle clamping nut. (See
Step 6, Fig. 10.)
1. Move to Highest Point
2. Raise 4.
Loosen with
Lever Socket Wrench
i 11164197
3. Swing ~ ./ / 5. lnse_rt Needle,
towo,d LEFT ~ // ./ against Stop
'NEEDLE4~
6. Tighten Nut
Fig. 10. Needle Correctly Set in Needle Clamp
PREPARATION FOR THREADING
For convenience in threading ...
. . . Machine 246K42: Swing edge guide out of
position, as instructed in Step 1, Fig. 11 .
. . . All Machines: ... Raise bench stand flap
and open front cover plate.
... Swing cloth plate toward left.
... Release presser bar as instructed in Step 5,
Fig. 11 and swing presser bar tow a rd left.
8
~\
4. Swing
Cloth Plate
toward LEFT
1. Swing Guide
toward Right
(246K42l
~3.Pull
~,this Cover open
~ 2.Raise
_.,,~this Bench Stand Flap
Fig. 11. Preparation for Threading

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
TO
THREAD
UNWINDER
Select
the
unwinder
suitable
for
the
type
of
stitch
and
work
to
be
accomplished
.
LOOPER
THREAt
i
NEEDLE
i
CREAD
...
.
.
..
,
RIGHT
/
I I
LOOPE~
! I
THREAD
: :
: :
. .
. .
. .
. .
•
•
• •
•
•
• •
<$~
~
~·
\ • ·- I
\\
l
i
i
i
LEFT
;
LOOPER
~
THREAD
.
.
.
.
.
.
\
\
.
\
...•.•
NEEDLE
THREAD
£27458
Fig. 12.
Unwinder
151031
Threaded
for
Two-Thread
Stitch Fig. 13.
Unwinder
151031
Threaded
for
Three-Thread
Stitch
USE
THREADING
WIRE
rl
►)
LEFT
,
LOOPER
\THREAD-._.
RIGHT
\
~~~~~_;\
~
··
..
NEEDLE
THREAD
Fig. 14.
Unwinder
228706
(for
Nylon
Thread)
Threaded
for
Three-Thread
Stitch
9