Singer 678B002 Troubleshooting guide

SINGER
678B002,B005,B007 ,BOOS
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Service Manual Bnd- Parts List
6788002
6788005
6788007
6788008
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IDENTIFICATION OF MACHINES
Each 678B rrachine is identified by a Variety number on a metal plate on the
ma.chine.
APPLICATION OF CATAI.CX;
This catalog applies specifically to the standard Varieties of ma.chines as
listed herein. References to direction such as right, left, front, back, etc.,
are given from the operator's position while seated at the ma.chine unless otherwise
noted. Operating direction of handwheel is toward the operator.
VARIEI'IES OF MACHINES
Advanced High Speed, Two and Three Needle, One Looper, One Spreader, Offset
and Tandem, Top Screw Adjusted Differential Feed Flat Bed Machines, Medium
Throw, Needle Bearing Needle Bar Drive, Light Weight Presser Bar and Needle
Bar Driving Mechanism, Single Reservoir, Enclosed PositiveAutomatic Lubricating
System, Filtered Oil Return Pumps for Head and Base, Wakefield Bearings for
Feed Rocker Shaft, Single Disc Looper Thread Take-up with an Adjustable Cast-off
plate Support. Large Handwheel and Improved Belt Guard. Prepared for use with
Knee Press for Presser Foot Lifter, Equipped with Disc Type Thread Tensions,
Maximum Work Space to Right of Needle Bar 8 1/4 Inches (209. 55 mm).
678B002 Three needle five thread interlock stitch, offset differential feed machine,
for attaching cuffs in one operation to knitted undergarments, and similar opera-
tions on light to medium weight materials. Seam specification 605-FSa-1. cat.
7 2 8 4 needle . Standard Gauge No. 16 only. Maximum recommended speed
5500 R. P.M.
f)78B005 Two needle four thread interlock stitch, offset differential feed machine,
for attaching cellarettes to knitted undergarments and similar operations on
light tomedium weight material. Long lengthribbed knit strip cutperpendicular
to the wale or parallel with the wale. Constant strip tension, Seam specification
602-BSa-1. cat. 7 2 8 4 needle. Standard Gauge Nos. 8 and 12. Standard
finished widths 3/4, 7/8, 1, 11/4 inches (19.05, 22.23, 25.40, 31.75 mm).
Specify gauge and finished width. Maximum recommended speed 5500 R. P.M.
678B007 Three needle five thread interlock stitch, offset differential feed machine,
for attaching cellarettes to knitted undergarments and similar operations on
light to medium weight rna terial. Long length ribbed knit strip cut perpendicular
to the wale or parallel with the wale. Constant strip tension. Seam specification
605-BSa-1. cat. 7 2 8 4 needle. Standard Gauge Nos. 14 and 16. Standard
finished widths 3/4, 7/8, 1 and 1 1/4 inches (19. 05, 22. 23, 25. 40, 31.75 mm).
Specify throat plate, gauge, finished width and stitches per inch. Maximum
recommended speed 5500 R. P.M.
678B008 Three needle five thread interlock stitch, tandem differential feed machine,
for patch operations on flat and ribbed knit undergarments and similar opera-
tions on light to medium weight material. Seam specification 605-LSa-1. cat.
7 2 8 4 needle .• Standard gauge No. 16 only. Maximum recommended speed
5500 R.P.M.
3
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NEEDLES
The standard recommended needle for machines in this catalog is
Cat. 7284 (available in sizes 10 to 18).
Selection of proper needle size is determined by the size of thread
used. Thread should pass freely through needle eye to produce a good
stitch formation.
ORDERING REPAIR PARTS
ILLUSTRATIONS
This catalog is arranged to simplify ordering replacement parts.
Exploded views of various sections of the mechanism are shown on the
left hand pages so that parts may be seen in their actual positions
in the machine. On the right hand pages opposite the illustrations,
the parts are listed with descriptions and the quantity of parts re-
quired in the particular view being shown.
Numbers in the first column are reference numbers only, indicating
position of a part in the illustration. Do not use the reference num-
bers in ordering.
In the second column in the examples below are the part numbers
as listed in this catalog. In the third column is the coded number
to be ordered. The prefix "910" must be used. Additionally, letter
suffixes generally are transposed as a prefix to the ?art number.
Components of sub-assemblies which can be furnished as replace-
ments are indented under the description of the main sub-assembly.
The
of
this
Ref.
examples below show how to order using parts on Page 35
catalog to illustrate the instructions above:
Part
Order
No.
No.
As
Description
Qty.
1
56381-219
910-56381-219
Cloth
Plate
Lever
----------- 1
2
51281 AC
910-AC
51281
Spring
----------------- 1
3
35772 H
910-H
35772
Washer
----------------- 3
4
22760
A
910-A
22760
Screw
------------------ 3
5
22845 B
910-B
22845
Screw
------------------ 1
Where the parts for all machine varieties covered in this catalog_
are not the same, the difference will be shown in the illustrations
or mentioned in the descriptions. When a part is used in all machines
in this catalog, the variety number is not mentioned.
A numerical list of all parts shown in this catalog appears on
Pages 46 and 47 to facilitate locating the illustration and description
when the part number is known.
4
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~~.-----~---.---/-_---=-·~~~~~---~
FILL
MAIN
RESERVOIR
HERE
I fo
Fig. 1
CAUTION!
FOR CORRECT
OIL LEVEL
NEEDLE OF GAUGE
SHOULD BE IN
OPERATE POSITION
FILL ALL OIL RESERVOIRS
BEFORE STARTING.
MACHINE
HAS BEEN DRAINED
BEFORE SHIPPING.
THREADING AND OILING DIAGRAM FOR 6 7 8 B t1achines
Thread machine as indica ted. The looper threading has been enlarged for clarity.
The machine illustrated above is a three needle machine, but the two needle machines
are threaded in substantially the same manner.
The oil has been drained from the machine before shipping and the reservoir
mustbe filledbefore starting to operate. To fillmachine with oil, remove plug screw
in top cover and add oil until needle of oil gauge (A, FiR. 1) i~ on ~he qlack line,
located to the right of "OPERATE" zone marked ''FULL • Malntaln Oll level
in ''OPERATE" position and add oil when needle is to the black line located to the left
of ''OPERATE" zone marked "LOW". The machine is automatically lubricated and no
oilif!.g other th~n keeping the main reservoir filled is necessary. Use Singer Type
C Oll or equlvalent.
Excessive oil in the main reservoir may be drained at the plug screw, located
in the main frame to the left of the oil gauge.
5
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H
VAPOR
mSPLASH ACTION
OIL RESERVOIR
gOIL FEED
lflorL RETURN
SCRE\\ \\'ITH
BY-PAS" CH'TI :c:T
6
M
OIL FRO:\I LEFT
CRA'-:KSR'\FT BCSHI='!G
''
I '
I
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Figure
Letter
A.
B.
c.
D.
E.
F.
G.
H.
I.
J.
K.
Figure
Letter
L.
M.
ADVANCED FLA. TBED LUBRICATION SYSTEM
SUPPLY SYSTEM
Bearing or Machine Area
Crankshaft drives, upper ball straps
and crankshaft bearings.
Needle lever cross shaft bearing.
Head area (all mechanisms and bear-
ings).
Looper drive crank, looper drive
lever bearings.
Opposing Helical grooves in right
end of mainshaft. Short groove pre-
vents oil leakage from right main-
shaft bearing.
Right mainshaft bearing.
Left main shaft bearing and all ecc en-
tric bearings located on mainshaft.
Lower ends of connecting rods of
mainshaft eccentrics.
Looper cone, right and left looper
rocker shaft bearings, and left loo-
per rod ball joint.
Right looper rod needle bearing
joint.
Feed rocker shaft and upper feed
rocker shaft bearings.
RETURN SYSTEM
Machine Area
Head
Base
7
Method of Lubrication
Oil agitation as a result of extens-
ions on needle lever connecting
rods.
Oil trough (51282 AE) which is
supplied by splash in column area.
Mist as a result of splash in column.
Oil agitation as a result of splasher
(56343 E) on bottom of looper drive
connecting rod.
Oil drip plate which accumulates
splash in chamber.
Supply grooves in right end of main-
shaft.
Oil supplied from hollow mainshaft
and metered by felt plugs. Oil is in-
troduced into center of shaft in the
r i g h t mains haft bearing area.
Amount of lubricant in center of
shaft controlled with by-pass hole
in right end of mainshaft.
Oil run-out from eccentric bearing
supplies.
Supplied from hollow looper rocker
shaft which contains 4 strands of
yarn as a metering device.
Oil supplied from front base felt
to lubricating plate (56393 K).
Self-lubricated bearings.
Method of Return
Felt pad in head collects oil. Return
pump located on crankshaft and
primed by oil from left crankshaft
bearing.
Felt pad in base collects oil. Second
return pump located on crankshaft
and primed by oil drip plate which
accumulates splash in looper drive
chamber.
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INSTRUCTIONS FOR MECHANICS
LUBRICATION
CAUTION! Oil has been drained from the main reservoir before shipment, so the
reservoir must be filled to the proper level as indicated on oil gauge (A, Fig. 1)
before beginning to operate. Run machine slowly for several minutes to distribute
the oil to the various parts. Full speed operation can then be expected without
damage.
RECOMMENDED OIL
use Singer Type C oil or equivalent in the main reservoir. Fill
main reservoir at plug screw in upper crank chamber cover (A, Fig. 2)
and check oil level at gauqe (B) . Oil is maximum safe operating level
when needle is to the black line, located to the right of "OPERATE"
zone, marked "FULL''. Oil should be added when needle is to the black
line, located to the left of "OPERATE" zone, marked "LOW".
CAUTION! It is important that these machines not be over filled.
It is recommended that a new machine, or one that has been out of service for
an extended period be lubricated as follows: Remove the head cover, clean out lint
and directly oil the needle bar link and the needle bar. Replace head cover as no
further hand oiling will be required. Run machine slowly for several minutes to
distribute oil to the various parts.
For machines in operation check the oil for dirt
and lint deposits at reasonable intervals. If dirty,
change the oil. An oil change is recommended
every 2000 operating hours. Oil may be drained
from main reservoir by removing plug screw (C,
Fig. 2) located below the cloth plate at front of the
machine, or by removing the lower crank chamber
cover, located at the back of machine.
NOTE: Looper avoid and feed lift eccentrics re-
ceive oil thru the mainshaft, so when assembling
be sure oil holes in the eccentric line up with oil
holes in mainshaftwhen spot screw is in time spot.
OIL GAUGE
The oil gauge is set at the factory to show the
proper oil level in the reservoir. Should an adjust-
ment become necessary, however, the following
steps should be followed:
1. Place the machine upright on a level table
or bench.
2. Remove the oil reservoir plug screw (C,
Fig. 2) and tip machine forward to drain
oil from the reservoir.
3. Make sure all oil is drained from main
reservoir.
8
Fig. 2
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Fig. 3
OIL GAUGE (Continued)
4. Remove lower crank chamber cover, located at
the back of the machine.
5. Fill main reservoir to a level even with the bot-
tom contour of the knee press shaft bushing (D,
Fig. 2).
6. Loosen lock nut (E) on calibrating screw (F), and
turn the screw to the left or right until the gauge
needle rests on the black line, located to the left
of ''OPERATE" zone, marked "LOW".
7. Tighten lock nut (E) and replace plug screw (C)
and lower crank chamber cover.
8. Add oil so that gauge needle rests on the black line, located to the right of
''OPERATE" zone, marked ''FULL".
NEEDLE LEVER BEARING OILER
Remove the head cover and upper crank chamber cover (G, Fig. 2). Check
position of needle lever bearing oiler (A, Fig. 3) located inside the arm casting,
below the upper crank chamber cover, which lubricates the needle lever stud (B).
Make sure it is tilted downwardly and that its delivery end (C) contacts the inside
wall of the bed casting at the back, just above the notch of the needle lever shaft stop
collar. (Do not allow the oiler to rest on the needle lever). Allow 1I64 inch (. 40 mm)
clearance as in Fig. 3.
ALIGNING THE NEEDLE BAR
Align the needle bar (A,
Fig. 4) and set to height,
using
the proper test
pins
and test plate of the right gauge. See chart below.
Machine
Test Plate
Right Test Pin
Left Test Pin
Style
No. No.
No.
678B002
698 BB-16
699 D
699 L
fi7'3B005
698 BB-8 699 R-8
699 L
670,"?.005
698 BB-12
699 R-12
699 L
6738007
None None
699 L
673B007
698 BB-16
699 D 699 L
673:SOOJ
698 BB-16
699 D
699 L
Insert test pin No. 699 L in the left seat of the needle holder and the proper
right hand test pin (See Chart) should be inserted in the right needle seat. Now
assemble test plate to machine using the throat plate attaching screws. The needle
bar is located properly if the test pins align with the holes in the test plate and the
height of the needle bar is correct when the shoulder of the test pins rest on the test
plate, when the needle bar is at its lowest position.
9
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ALIGNING THE NEEDLE BAR (Continued)
If test plate and test pins are not available, insert a new set of needles (Type
and Size as required) and align the needle bar so the needles center in the needle
holes of throat plate. To align needle bar, loosen needle bar clamp screw (B, Fig.
4) and turn bar as required. Tighten clamp screw.
SYNCHRONIZING LOOPER AND NEEDLE MOTIONS
Check the synchronization of the looper and
needle motions, using gauge No. 21227 R as follows:
Insert the pin, which is included with the gauge,
in the back hole in the looper rocker. Place the
gauge plate on the throat plate seat using the throat
plate screws for attaching. Place the shank of the
indicator in the take-up wire hole in bed. Turn the
handwheel in operating direction until the pin in the
looper rocker contacts the edge of the gauge plate
andset theindicatorso thatthe leftend ofthe point-
er rests against the top of the needle bar and the
right end of the pointer rests at 'b". Tighten the
set screw and note indicator reading. Turn the hand-
wheel in the reverse direction until the pin again
contacts the plate. If the motions are in synchroni-
zation, the pointer of the indicator will return to the
same reading. A variation of one graduation on the
scale is allowable. If the reading is higher on the
scale when the handwheel is turned in the opera-
ting direction, the looper drive lever shaft will have
to be moved to the rear. If the reading is lower,
this shaft will have to be moved to the front.
NOTE: If gauge No. 21227 R is not available, syn-
chronization may be checked as follows:
Fig. 5
Fig. 4
Insert the looper in the looper rocker and turn handwheel in operating direct-
ion until the point of the looper (A, Fig. 5), moving to the left is even with the left
side of right needle (B). Note the height of the eye of the needle with respect to the
looper point, then turn handwheel in the reverse direction until the looper point again
moves to the left, and is even with the left side of the right needle.
10
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SYNCHRONIZING LOOPER AND NEEDLE MOTIONS (Continued)
If the motions synchronize, the height of the eye of the needle with respect to the
looper point will be the same. A variation of . 005 inch (.127 mm) is allowable.
If the distance from the eye of the needle to the point of the looper is greatest when
the pulley is turned in the operating direction, move the looper drive shaft syn-
chronizing stud (A, Fig. 6) to the rear. Moving it in the opposite direction acts the
reverse.
Fig. 6
Moving of the looper drive lever shaft synchronizing stud is accomplished as
follows: Loosen the clamp screw (B, Fig. 6) of the looper drive lever (C). To move
stud to rear (away from operator), a light tap with a small hammer, directly on the
stud, is all that is required. To move stud forward (toward operator), remove the
cloth plate, throat plate support, oil reservoir top cover and oil reservoir back
cover, then, a light tap on the looper drive lever rocker shaft, toward the opera-
tor, is all that is required.
NOTE: Looper drive lever (C, Fig. 6) has an oil seal collar and an "O" ring between
it and the bed casting. All end play must be removed from the looper drive lever
rocker shaft by compressing the ''0" ring until drive lever (C) and the oil seal collar
make metal to metal contact with the bed casting. Tighten screw (B).
With the looper at the extreme right end of its travel,
check the location of the center line of the right looper
connecting rod bearing, using gauge No. 21227 CX. Remove
nut (C, Fig. 5) and place hole in gauge over threaded stud. The
left end of the gauge should locate against the right side of the
looper rocker cone (D). If adjustment is necessary, loosen the
clamp screw (B, Fig. 6) and reposition the looper drive lever
(C) as required. Tighten clamp screw. If gauge is not available
setting can be checked with a scale. The distance between
the center line of the looper rocker cone and the center line
of the looper lever stud should be 4 1/16 inch (103.19 mm)
(Fig. 6), when looper is at the extreme right end of its
travel. Refer to ''NOTE" in above paragraph.
11
Fig. 7
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SETTING THE LOOPER
Insert a new needle in the right needle seat, type and size as specified. If the
looper gauge is 3/16 inch (4.76 mm), for example, set the looper (D, Fig. 6) so the
distancefrom the centerof the right needle(E) to the pointof the looperis 3/16 inch
(4. 76 mm) when the looper is at its farthest position to the right. Looper gauge No.
21225-3/16 can be used advantageously in making this adjustment. Refer to chart
below for needle Type, looper gauge setting and looper gauge number for the various
styles of machines. If adjustment is required, loosen nut {F) (it has a left hand thread)
and nut {G) on connecting rod (H), turn the connecting rod forward or backward to
obtain the 3/16 inch (4. 76 mm) dimension. Retighten both nuts, first nut {G) and then nut
(F). Make sure the left ball joint is in vertical position and does not bind after adjust-
ment.
Machine Needle
Looper Gauge
Type
Setting
678BC02 -16
Cat. 7284
3/16
11
(4.76 mm)
673BOOS-'3
Cat. 7281
7/32
11
(5. 56 mm)
6788005-12
Cat. 7284 7/32
11
(5. 56 mm)
678'3007 -14
Cat.
7284
3/16
11
(4. 76 mm)
673B007-16
Cat.
7284
3/16
11
(4. 76 mm)
673.3003-16
Cat. 7284
3/16
11
(4. 76 mm)
The looper is set correctly in line-of-feed, if, as
it moves to the left, behind the needle, its point (A,
Fig. 7) brushes, but does not pick at the rear of the
needle (B).
If adjustment is necessary, loosen lock screw
(J, Fig. 6) and turn stop screw (K) as required. Turn-
Looper Gauge
Number
21225-3/16
21225-7/32
21225-7/32
21225-3/16
21225-3/16
21225-3/16
ing stop screw clockwise sets the looper to the rear Fig. 8
and turning it counterclockwise acts the reverse.
Holding looper to the front while making this adjustment may prove helpful. Tighten
lock screw (J) when setting is obtained and recheck the adjustment.
SETTING HEIGHT OF NEEDLE BAR
The height of the needle (C, Fig. 4) is correct when the top of its eye is 3/64
inch (1.19 mm) (Fig. 5) below the underside of the looper, with the looper point
flush with the left side of the needle. If adjustment is necessary, loosen screw (B,
Fig. 4) and move needle bar {A) up or down as required and retighten screw. Care
should be taken not to distur"b the alignment of the needle bar when moving the needle
bar either up or down.
The needles are to have equal clearance on the right and left sides of needle
slots in throat plate.
SETTING THE MAIN FEED DOG
The main feed dog should be set to rise the depth of a full tooth, or approximately
3/64 inch (1.19 mm) above the throat plate, at the highest point of travel. The feed
dog should be centered in the slots of the throat plate at maximum feed travel.
To raise or lower the main feed dog, loosen Allen screw (A, Fig. 8) and adjust
the feed dog holder (B) to set the feed dog at specified height. Retighten screw (A).
12
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SETTING TilE .lVIAIN FEED DOG (Continued)
NOTE: A change of feed dog height will necessitate a check of the·rearneedle guard
setting.
The main feed dog should have equal clearance on all sides of feed slots in the
throat plate at maximum feed travel. To adjust the main feed dog across-the-line-
of-feed, loosen screws (C, Fig. 8) and position feed dog as required. Retighten
screws (C). To adjust main feed dog in-line-of-feed, loosen nut (A, Fig. 9) and
move feed bar as required. Retighten nut.
SETTING THE DIFFERENTIAL FEED DOG
The differential feed dog should also be set to rise the depth of a full tooth above
the throat plate, at the highest point of travel and center in the feed slots of the
throat plate at maximum feed travel. In addition to this the teeth of the feed dog
should be parallel to the top surface of the throat plate across the line-of-feed.
Fig. 9
To raise or lower the differential feed dog, loosen screw (B, Fig. 9) and set
the feed dog at the required height. Retighten screw.
Loosen set screws (C, Fig. 9) and move the differential feed bar (D) forward
or backward as required. The loosening of set screws (C) will also allow the differ-
ential feed bar (D) to be rotated, so the differential feed dog can be aligned parallel
with the top surface of the throat plate, across-the-line-of-feed. Tighten screws
securely.
NOTE: Turn machine by hand to make sure the differential feed dog has clearance
through its cycle and does not contact the main feed dog at back end of its travel or
the throat plate at the forward end of its travel.
13
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SETTING THE DIFFERENTIAL FEED RATIO
The differential feed ratio is set by
loosening screw (A, Fig. 10) and moving the
selector slide (B) to the desired position.
The screw and selector slide are accessible
through the top of the cloth plate on the left
side. Moving the differential feed selector
slide (B) toward the front increases the
amount of differential and moving it back
decreases the differential feed. Retighten
screw.
This Class ofmachine has a stretching Fig. 10
ratio of 3I4 to 1 up to a gathering ratio of 2 to 1, depending on the length of stitch
set at the main feed dog. Turn machine by hand, making sure the differential feed
dog clears the main feed at the back end of its stroke.
Fig. 11
CHANGING STITCH LENGTH
Set the stitch to the required length. This is ac-
complished by loosening locknut (A, Fig. 11) (it has
a left hand thread) and turning the stitch adjusting
screw (B). Turning screw (B) clockwise shortens the
stitch and turning it in a counterclockwise direction
lengthens the stitch. The head of the mainshaft (C)
is marked with an 'S" and an "L", moving the stitch
regulating stud toward the "S" shortens the stitch and
toward the ''L" lengthens the stitch. Retighten locknut
(A). To prevent destructive damage to the feed drive
bearing, the Key screw (D) must engage the "U" shaped
key slot in the ferrule (E).
NOTE: Any change in stitch length will necessitate a corresponding change in the
rear needle guard setting and a check of the feed dog height.
SETTING THE REAR NEEDLE GUARD
Set the rear needle guard ( C, Fig. 10) horizontally so that it does not quite contact
the rear of the right needle (D) when at its most forward point of travel. A clearance
of.005inch(.127mm) ispermissible. It shouldbe set aslowaspossible, yethave its
vertical face approach within about 3I64 inch (1. 19 mm) of the needle, until the point
of the looper (E), moving to the left, is even with the needle. To move needle guard
merely loosen screw (F), move needle guard as required, and retighten screw.
NOTE: Adjustment of the rear needle guard will necessitate a check of the main
feed dog height,
SETTING FRONT NEEDLE GUARD
Set the front needle guard so that it pushes the
left needle back toward the path of the looper as it
moves behind the needle. The looper may brush but
not pick at the left needle. It should be set as low as
possible, yet have its vertical face push the left needle
until the point of the looper is just past the left side
of the left needle. The front needle guard should not
contact the rear needle guard or right needle at any
time. To move guard forward or backward, merely
loosen screws (A, Fig. 12) move needle guard as
required and retighten screws. To raise, lower or
rotate needle guard, loosen screws (B), move guard
and retighten screws after guard is properly set. Fig. 12
NOTE: A change in stitch length WILL NOT require a change in front needle guard
setting. 14
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THREAD TENSION RELEASE
The thread tension release is set correctly when it begins to function as the
presser foot is raised to within 1I8 inch (3. 17 mm) of the end of its travel and is
entirely released when the presser foot has reached its highest position.
Fig. 13
If adjustment is needed, loosen tension release lever screw
(A, Fig. 13), located at the back of the machine and move tension
disc separator as required. Retighten screw. After adjustment
there should be no binding at any point.
SETTING HEIGHT OF PRESSER BAR
The height of the presser bar (A, Fig. 14) is set correctly
if it is possible to remove the presser foot when the foot lliter
lever (B, Fig. 13) is fully depressed. Also there should be
approximately 1116 inch (1. 59 mm) clearance between lower
surface of the presser bar connection and guide (B, Fig. 14) and
the bottom surface of head opening in the bed when the foot lliter
lever is released and the presser foot resting on the throat plate,
with the feed dog down below the throat plate.
If adjustment is needed, turn handwheel in operating direction until the needle
bar is in the low position. Loosen screw (C), then, while holding presser foot down
on the throat plate surface~ pry up presser bar connection and guide with a screw-
driver to obtain the 1 I 16 inch (1. 59 mm) setting and retighten screw. Check setting
by turning handwheel so that needle bar is in its high position and see if presser
foot can be removed as mentioned in previous paragraph.
Set the presser bar collar (D, Fig. 14) so that the presser foot does not contact
the spreader when raised.
SETTIN"G THE SPREADER
Set the arc travel of the spreader, as listed below, by loosening nut (E, Fig.
14) and moving the connecting link (F) up or down to the desired amount of arc
travel. Measurement of the spreader arc travel is made by placing a scale between
the two extreme spreader arc travel points.
Machine
678B002-1C
678:3005-8
6783005-12
67'3'3007-14
678B007-1€
678BOOS-16
Spreader Arc Travel
11116" (17.46 mm)
9116" (14.29 mm)
518" (15.88 mm)
21132" (16. 67 mm)
11116" (17 .46 mm)
11116" (17 .46 mm)
Set the ball stud (G, Fig. 14) in the spreader holder carrier (H) square to the
front of the bed when at the middle of its travel as viewed in Figure 14. This is
accomplished by loosening nut {J) and moving the spreader rocker shaft arm (K)
to position the carrier properly.
15
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SETTING THE SPREADER (Continued)
With the needle bar in the up position, and the
spreader (A, Fig. 15) at the left end of its stroke,
the upper spreader point should extend 7/32 inch
(5. 56 mm) to the left of the center line of the left
needle. This is accomplished by loosening screws
(A, Fig. 16) and rotating spreader holder (B) to
position the upper spreader point. Retighten screws.
CAUTION: The spreader holder is also the lower
thrust collar for the spreader shaft, so when tight-
ening screws (A, .IHg. 16) be sure to push down on
the spreader shaft and up on the spreader holder.
The spreader should clear the left needle shank
by 1I64 to 1/32 inch (. 40 to. 79 mm) and the bottom
of the spreader should be 21 I64 inch (8. 33 mm)
above the throat plate (Fig. 15). To adjust, loosen
screws (C, Fig. 16) and position spreader as re-
quired.
The left edge of the spreader thread guide (B,
Fig. 15) should clear the right needle l:>y approxi-
mately 3/32 inch (2. 38 mm) and be kept close to the
top of the spreader. This is accomplished by loosen-
ing screws (C) and moving the guide as necessary.
THREADING
Fig. 14
Thread machine as indicated in Fig. 1 and start operating on a piece of fabric.
Fig. 15
THREAD TENSION
Pull the thread through the eye-
lets and set the left needle thread
tension and center needle thread
tension at 4 ounces (113. 40 gr.) on
678B002, 007 and 008. Set the left
needle thread tension at 3 ounces
(85• 05 gr. ) on 678B 005 only, and
the right needle thread tension at 4
ounces (113.40 gr.) on all varieties.
c
Set the spreader thread tension Fig. 16
at 1 ounce (28. 35 gr.) on the upper
thread tension. The adjusting nut below the needle lever
thread eyelet should be set so that the tension on the spread-
er thread is 1/2 onnce (14.18 gr.) or more, depending on
the type of thread being used. This applies to all varieties.
The looper thread tension is set at 2 ounces (56.70 gr.) on all varieties. It is
applied at the thread tensions located on the front of the machine just above the
oil gauge.
16
From the library of: Superior Sewing Machine & Supply LLC

SETTING THE NEEDLE AND SPREADER THREAD FRAME EYELETS
Set the needle thread frame eyelet (A, Fig. 17) 1 inch (25. 4 mm) above the
center of the mounting screw (B).
Fig. 17
SETTING LOOPER THREAD
TAKE-UP
The looper thread take-up (A, Fig. 18)
is not spotted on the main shaft and conse-
quently, can be set to compensate for vary-
ing conditions. It is set correctly when the
looper thread is just cast off the highest
lobe of the take-up when the point of the left
needle is clearly visible below the underside
of the looper. The cast-off plate support (B)
is adjustable, and its setting determines the
amount of thread pulled off by the take-up.
Moving support (B) up towards the bottom
of its mounting screw slots (C) causes more
thread to be pulled from the cones. Moving
it down towards the top of its screw slots
causes less thread to be pulled. The looper
threads should just become taut as the loop-
ers reach their extreme position to the left.
Before tightening the two screws which se-
cure support (B), center the looper thread
take-up in the cast-off plate support (right
to left) by useofshims No. 39152 U-4 inserted between same. When take-up is cen-
tered, tighten two screws securing support (B) and remove shims.
SETTING SPREADER THREAD TAKE- UP
The "U'' shaped eyelet (C, Fig. 17) should be set to allow the spreader thread
to engage the bottom of the needle lever eyelet (D) by 1/4 inch (6. 35 mm). Raising
the eyelet makes a looser cover thread, lowering same makes a tighter cover thread.
PRESSER FOOT PRESSURE
Regulate the presser spring regulating screw (E, Fig. 17)
so that it exerts only enough pressure on the presser foot to
feed the work uniformly when a slight tension is placed on the
fabric. This is the knurled screw, located directly behind the
needle bar in the head of the machine. Turning it clockwise
increases the pressure, counterclockwise acts the reverse .
TORQUE REQUIREMENTS
Torque (measured in inch-pounds) is a rotating force (in Fig. 18
pounds) applied through a distance by a lever (in inches or
feet). This is accomplished by a wrench, screwdriver, etc. Many of these devices
are available, which when set at the proper amount of torque, will tighten the part
to the correct amount and no tighter.
All straps and eccentrics should be tightened to 19-21 inch-pounds, (22-24 em/kg)
unless otherwise noted. All other nuts, bolts, screws, etc., should be tightened by
hand as tightly as possible, unless otherwise noted.
The screws requiring a specific torque, will be indicated on the picture plates.
17
From the library of: Superior Sewing Machine & Supply LLC

CA UTilO~e!servoir
Fill Ol tarting.
before : has been
Machmd before
drame
shipping.
18
21
5
From the library of: Superior Sewing Machine & Supply LLC

Ref.
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
IMPORTANT: BEFORE ORDERING ANY PARTS BELOW, REFER TO THE DETAILED
INSTRUCTIONS ON PAGE 4
Part
No.
57882 E
357
56382 K
56382 J
22829
56382 F
22848
56382 L
22548
56382 D
56382 E
56382
lVI
22733 E
22541 c
56382 B
56382 c
90
52882 y
22539 s
21375AV
22829
98 A
98 A
158 B
56391
22569 D
57857
57804
28
52958 B
22848
20
51858
22889 A
95
57844 B
57858
22585 c
57844
57892 A
80665 F
57892
D-1
57892 B
22542
57844 A
57944 A
605 A
57944 B
57882
22733 c
22569 c
57882 B
22564 B
57831
22513
35731 A
22539 G
22894 E
51282 AE
MAIN FRAME, CAST-OFF PLATE AND MISCELLANEOUS COVERS
Amt.
Description
Req.
Oil Drip Plate -------------------------------------------------- 1
Screw---------------------------------------------------------- 2
Gasket --------------------------------------------------------- 1
Looper Drive Shaft Reservoir Cover ------------------------------ 1
Screw---------------------------------------------------------- 2
Oil Reservoir Back Cover---------------------------------------- 1
Screw---------------------------------------------------------- 9
Gasket --------------------------------------------------------- 1
Screw---------------------------------------------------------- 4
Crank Chamber Cover, lower ------------------------------------ 1
Gasket--------------------------------------------------------- 1
Gasket--------------------------------------------------------- 1
Oil Filler Plug Screw-------------------------------------------- 1
Screw---------------------------------------------------------- 4
Upper Crank Chamber Cover------------------------------------- 1
Gasket --------------------------------------------------------- 1
Screw---------------------------------------------------------- 2
Baffle Plate----------------------------------------------------- 1
Plug Screw ----------------------------------------------------- 1
Belt Guard ----------------------------------------------------- 1
Screw---------------------------------------------------------- 2
Screw for 678B002 and 008 ------------------------------------ 3
Screw: for 678BOOS and 007 ------------------------------------- 2
Looper Thread Eyelet ------------------------------------------- 1
Looper Thread Guard, for 678B002 and 008 ----------------------- 1
Screw---------------------------------------------------------- 2
Cast-off Plate Support ------------------------------------------- 1
Cast-off Plate--------------------------------------------------- 1
Screw---------------------------------------------------------- 2
Looper Thread Eyelet-------------------------------------------- 1
Screw---------------------------------------------------------- 1
VVasher -------------------------------------------------------- 1
Needle Thread Frame Eyelet ------------------------------------- 1
Adaptor Plug Screw---------------------------------------------- 1
Plug Screw ----------------------------------------------------- 1
Spreader Thread Eyelet :\Iounting Plate---------------------------- 1
Spreader Thread Pull-off Eyelet ---------------------------------- 1
Screw---------------------------------------------------------- 1
Spreader Thread Guide------------------------------------------- 1
Spreader Tension Post------------------------------------------- 1
Spreader Tension Disc------------------------------------------- 2
Spreader Tension Spring ----------------------------------------- 1
Spreader Tension Post Nut--------------------------------------- 1
Screw---------------------------------------------------------- 2
Thread Guide --------------------------------------------------- 1
Thread Eyelet -------------------------------------------------- 1
Screw---------------------------------------------------------- 2
Spreader and Needle Thread Guide-------------------------------- 1
Head Cover----------------------------------------------------- 1
Plug Screw ------------------------------------------------- 1
Screw---------------------------------------------------------- 3
Gasket--------------------------------------------------------- 1
Screw---------------------------------------------------------- 2
Presser Bar Connection Guide Plate, rear------------------------- 1
Screw---------------------------------------------------------- 2
Presser Bar Connection Guide Plate, front------------------------- 1
Plug Screw ----------------------------------------------------- 1
Screw---------------------------------------------------------- 2
Needle Lever Bearing Oiler -------------------------------------- 1
19
From the library of: Superior Sewing Machine & Supply LLC

From the library of: Superior Sewing Machine & Supply LLC