UnionSpecial 39500N Series Instruction sheet

FINEST QUALITY
STYLES
39500N
CATALOG
No.
103R
SECOND
EDITION
LEWIS • COLUMBIA
CLASS 39500 .
S TREAMLINED
®
INDUSTRIAL
S E WING
MACHINES
HIGH SPEED OVERSEAMERS
CH I CAGO
From the library of: Superior Sewing Machine & Supply LLC

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From the library of: Superior Sewing Machine & Supply LLC

Fe br ~ a ry. 1971
Catalog No. 103 R
INSTRUCTIONS
FOR
ADJUSTING AND OPERATING
LIST OF PARTS
CLASS 39500
Style
39500 N
Second E clition
Copyright 1957
by
Union Special Machin e Co.
Rights Reserved in All Countries
MACHINE COMPANY
INDUSTRIAL SEWING MACHINES
CHICAGO
Printed in U.S.A.
3
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FOREWORD
The Class 39500 machine is Union Special' s· latest overedger. New
streamlined styling, automatic lubrication, and light running high speed
performance are characteristics of these machines. All parts are made by
precision methods insuring complete interchangeability.
It is our constant aim to furnish carefully prepared information that will
enable the customer to secure all possible advantages from the use of Union
Specials. The following pages contain valuable operating and adjusting data,
and illustrates and describe the parts for Styles in Class 39500.
Union Special representatives will be found in all manufacturing centers,
anxious to cooperate with you to plan and estimate requirements.
~ MACH/NECOMPANY
Engineering Department
4
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IDENTIFICATION OF MACHINE
Each Union Sp e cial carries a Style number which is stamped in the name
plate on the machine. Style numbers are classified as standard and special.
Standard Style numbers have one or more letters suffixed, but never contain
the letter "Z". Example: "Style 39500 N". Special Style numbers contain the
letter "Z". When only minor changes are made in a standard machine, a "Z"
is suffixed to the standard Style number. Example: "Style 39500 NZ".
Styles of machines similar in construction are grouped under a Class num-
ber, which contains no letters. Example: "Class 39500".
APPLICATION OF CATALOG
This catalog applies specifically to the standard Styles of machines as listed
herein. It can also be applied with discretion to some special machines in
Class 39500. All references to directions, such as right and left, front and
back, etc .• are taken from the operator's position while seated at the machine.
Operating direction of handwheel is away from operator.
STYLES OF MACHINES
Single Curved Blade Needle, Two Looper, Three Thread, Overseaming Ma-
chine. Plain Feed, Trimming Mechanism with Spring Pressed Lower Knife,
Automatic Lubricating System.
39500 N For seaming garment pockets and similar operations on heavyweig-ht
fabrics. Seam specification 504 SSa-1, standard seam width 3/16 to 7/32
inch; stitch range 8-20 per inch
1
standard setting 12 per inch; cam adjusted
plain feed.
OILING
CAUTION! Oil was drained from machine when shipped, so reservoir
must be filled before beginning to operate. Oil capacity of Class 39500 is six
oun8es. A straight mineral oil of a Saybolt viscosity of 90 to 125 seconds at
100 Fahrenheit should be used.
Machine is filled with oil at spring cap in top cover. Oil level is checked
at sight gauge on front of machine. Red tip of oil indicator should show between
gauge lines when machine is stationary.
Machine is automatically lubricated. No oiling is necessary, other than
keeping main reservoir filled. Check oil daily before the morning start; add
oil as required.
Drain plug screw is located at back of machine near bottom edge of base.
It is a magnetic screw designed to accumulate possible foreign materials which
may have entered the crank case. It should be removed and cleaned periodi-
cally.
NEEDLES
Each UnionSpecialneedle has both type and size number. The type number
denotes the kind of shank, point, length, groove, finish and other details. Th e
size number, stamped on the needle shank, denotes largest diameter of blade,
measured in thousandths of an inch, midway between shank and eye. Collec-
tively, type and size number represent the complete symbol which is given on
the label of all needles packaged and sold by Union Special.
5
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NEEDLES (Continued)
Style 39500 N uses a curved blade needle. The standard needle for this
style is Type 154GAS. It is a curved blade, standard length, single groove,
shallow spot, long tapered point, struck groove, chromium plated in sizes
022, 025, 027' 029, 032, 036, 040, 044, 049, 054 ..
To have needle orders promptly and accurately filled, an empty package,
a sample needle, or the type and size number should be forwarded. Use de-
scription on label. A complete order would read: "1 000 Needles, Type 154GAS,
Size 036".
Selection of proper needle size is determined by size of thread used. Thread
should pass freely through needle eye in order to produce a good stitch forma-
tion.
Success in the operation of Union Special machines can be secured only by
use of needles packaged under our brand name, ~, which is
backed by a reputation for producing hi
0
hest quality needles in materials and
workmanship for more than three-quarters of a century.
CHANGING NEEDLES
Release pressure on presser foot by turning presser foot release bushin g
(U, Fig. 1) and swing presser arm (H) out of position. Turn handwheel in oper-
ating direction until needle is at its lowest point of travel. Usin g he xa g onal
socket wrench No. 21388 AU furnished with machine, loos en ne e dle clamp nut
about 1 /4 turn. Again turn handwheel until needle is at hi gh pos i tion; wi th-
draw needle.
To replace needle, leave needle holder at high posit i on and, wi th the flat
to the left, insert needle in holder until it rests aga in st stop pin. K ee pin g
needle in this position, turn handwheel until holder is again at its low po int of
travel; then tighten nut. Return press er arm (H) to positio n; r e -lock pr es s er
foot release bushing (U).
THREAD STAND
Afterthread comes from cone on thread stand (V, Fig. 1), it i s brou g ht up
through back thread eyelet, th en down throu gh fro nt thr e ad eyel et (W). Nex t it
is threaded through each pair of hole s in tens ion thread g uid e wir e (A). down
right hand hole and up throu gh l e ft hand hol e . Then thread cont i nu es be tw ee n
tension discs (AD), throu gh slot (AE), and on throu gh th rea d guide (B ).
THREADIN G
Only parts involv ed in thr e adin g are s hown in threadin g diagr am ( Fig . 1 ).
Parts are plac ed in th eir relative posit i ons for clar it y.
It will simplify thr e adin g this m a ch ine to f oll ow r e comm e nd ed se qu ence of
threadin g low er looper first, upper loo pe r se cond, and n ee dl e th ir d.
Before b egi nning to thr e ad, swin g clo th plate open, tu r n h andwh ee l in op er -
atin g direct i on until ne e dle (N) is at hi gh position, r ele a se pr ess ur e on pr esse r
foot by turn ing presser foot r e lease bu s hing (U); and s wi ng pr esser a rm (H) out
of position.
Be sure thr e ads, as th ey com e from t he ten si on thr ea d guide, are b et w ee n
tens
ion d is cs (AD) and in diagon al slot s (A E ) in ten si on po st s (AC).
(j
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llilitll Cll S I 011 1
ut
I'J:IIren ~ ion Po s t
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Ten:<ion Thread
1!1 Thread Guioc
BUpper Looper Thread Ey e! et
~Auxiliary Looper Thread Ey ele
IJ Lower Loo p er Thr ad E yel et
IJ Fabric Guard Br ac ket
aF'rame LoopPr
CJrr,.~ ~ • ·r Arm
Fig. 1
7
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Pres.rr foot HP! en•e H u s hin ~
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NPPdle Th read C am ! ~11-off
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Nee dle Thr e ad E yelet
Low er Loo per
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TO THREAD LOWER LOOPER
Doubl e end of thread and lead it through both eyes of lower looper thread
e yel et (E, Fi g. 1) from right to left. Note:thread must pass in front of looper
t hread pull-off (T). Lead thread behind fabric guard (F) and through both holes
of frame looper thread guide (G). Turn handwheel in operating direction until
heel of lower looper (K) is all the way to the left; then thread through both eyes
from left to right. Left eye of lower looper can be threaded easily if tweezers
are in left hand.
TO THREAD UPPER LOOPER
Turn handwheel until point of upper looper (L) is all the way left. Lead
thread through auxiliary looper thread eyelet (D) from back to front, then
through both eyes of upper looper thread eyelet (C) from left to right. Note;
thread must pass in front of looper thread pull-off (T). After pulling up upper
looper thread tube assembly (M), lead thread under neck of top cover casting
and down through thread tube assembly (M). Pull thread out bottom of tube;
push tube down, then insert thread through upper looper eye from front to back.
CAUTION! Be sure upper looper thread is under lower looper thread when
passing from tube assembly to upper looper eye.
TO THREAD THE NEEDLE
Turn handwheel in operating direction until needle (N, Fig. 1) is at its
highest position. Insert needle thread from right to left, through both eyes of
needle thread eyelet (R), under neck of top cover casting; then down through
hole in top cover needle thread eyelet (P). Thread needle from front.
THREAD TENSION
The amount of tension on needle and looper threads is regulated by three
knurled tension nuts (AA, Fig. 1). Tension on threads should be only enough
to secure proper stitch formation.
PRESSER FOOT PRESSURE
Sufficient pressure to feed work uniformly should
be maintained. Should it be necessary to increase or
decrease amount of pressure on presser foot, loosen
lock nut (A, Fig. 2) and turn adjusting screw (B).
Adjusting screw has a right hand thread; so tightening
increases pressure, loosening decreases pressure.
When pressure adjusting screw (B) has been properly
set, tighten lock nut (A). With presser foot resting
on throat plate, position locking nut (C) so that its
under surface is approximately 1/32 inch to 1/16 inch
from the top surface of adjusting screw (B). Set cap
(D) against locking nut (C).
FEED ECCENTRICS
Fig. 2
Feed eccentric used in this machine has been selected to produce approx-
imately 12 stitches per inch. It will be noted that the part number of feed
eccentric is No. 39540-12. Minor number of the part symbol indicates approx-
imately the number of stitches when usin g that eccentric. Unless otherwise
specified, machine will be shipped with above eccentric.
8
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FEED ECCENTRICS (Continued)
Following stitch number feed eccentrics are available under No. 39540- 4,
5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 20, 22. 24, 26, 28, 30. 32, 34,
36, 40. Only one eccentric is supplied with each machine. Additional eccen-
trics may be ord e red separately. To order an eccentric, use No. 39540 with
a minor number suffixed to indicate number of stitches desired. Example:
11
39540-8
11
•
ASSEMBLING AND ADJUSTING SEWING PARTS
Before assembling sewing parts, remove cloth plate, fabric guard, chip
guard. upper knife assembly, lower knife holder assembly; then follow this
suggested sequence.
Fig. 3
SETTING THE NEEDLE
With throat plate in position, needle should center in
the front end of needle slot. When needle is at high position,
needle point should be set
1/2 inch above throat plate
(Fig. 3). Move needle
driving arm (A, Fig. 3) by
loosening clamp screw (B).
Remove throat plate.
If needle t h r e a d cam
pull-off(A,•Fig. 4) overlaps
looper thread pull-off (B),
separate by moving looper
thread pull-off back. When
retightening looper pull-off
screw, be sure to take up
· end play in needle driving
arm.
At this point, in-
sert lower looper (A,
Fig. 6) into bar (B).
With lower looper at
left end of its stroke,
set looper point 1/8
inch from center of
needle (Fig. 6), using
looper gauge No.
21225-1/8. Do not
have lower looper de-
flecting needle.
Tighten nut.
Fig. 4
Fig. 6
Now assemble the main feed dog.
SETTING THE REAR NEEDLE GUARD
Set rear needle guard (A, Fig. 5) as high as pos-
sible, without interfering with either lower looper or
Fig. 5 movement of lower knife holder, but still in position
to deflect needle forward -. 002 - . 004 inch. Screw (B)
is used to set rear needle guard. Make sure th e re is no interference between
rear needle guard and lower looper.
9
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SETTING THE LOWER LOOPER
Now finish lower looper adjustment. As lower looper
moves to the right, its point should be set into the needle
scarf (A, Fig. 7) until the needle springs forward from
rear guard surface another . 002 - . 004 inch.
SETTING THE FRONT NEEDLE GUARD
Assemble front needJe guard (C, Fig. 5). When lower
looper is springing needle off back guard, set front needle
guard as close as possible to needle without touching.
Screw (D) is used to adjust and set front needle guard.
After this setting make sure there is no interference be-
tween needle guards and differential feed dog.
Fig. 7
Fig. 8
Fig. 9
SETTING THE UPPER LOOPER
Insert upper looper (A. Fig. 8) in its holder. Screw
(B, Fig. 8) holds upper looper in its holder, and permits
it to be pushed in or out or turned around its shank. Insert
upper looper holder into upper looper shaft, if it is not al-
ready in place. Screw (C. Fig. 8) on clamp holds the upper
looper holder in the shaft. Locate upper looper in its holder
so that the shank extends 1116 to 3132 inch beyond holder
(Fig. 8).
When the upper looper is at the right end of its stroke,
upper looper holder should be set to position upper looper
shank about vertically (Fig. 8).
By adjusting looper holder in or
out of upper looper shaft and by turning
the looper around its shank, set upper
looper point to cross lower looper to
the left of the lower looper eye with
0.002 to 0.004 clearance (Fig. 9).
Next. turn handwheel until upper
looper is at the left end of its travel;
check dimensions of upper looper point
with respect to needle and throat plate
(Fig. 10). If resetting is necessary,
do it by moving the upper looper holder
(A. Fig. 10). Figure 10 represents
the dimensional setting. Fig. 10
For example, dimension 1 I 2 inch is increased by turning upper looper
holder counter- clockwise looking from left end of machine; dimension 9I64 inch
is increased by pulling upper looper holder left, out of upper looper shaft.
After these changes are made, it may be necessary to turn upper looper around
its shank slightly to maintain the condition shown in Fig. 9.
10
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SETTING THE UPPER LOOPER (Continued)
When the correct setting is obtained, it can be checked
quickly as follows: As upper looper is moving to the right,
when upper looper eye centers on the needle, the eyes of
the upper looper and needle should align exactly (Fig. 11).
Check setting to avoid interference between upper looper
and needle on needle downstroke. If needle rubs the back
of upper looper, pull looper out of its holder slightly and
rotate looper a short distance counterclockwise, looking
from left end of machine. Reset to maintain dimensions
of Figs. 9, 10, 11.
Fig. 11
SETTING THE FEED DOGS
Assemble chaining feed
dog to main feed dog (A, B,
Fig. 12). Main feed dog
should be levelled with
respect to the throat plate by
rotating feed tilting adjusting
pin (C). This pin raises or
lowers the back end of the
feed bar.
~ The feed dogs should be
set level at the time teeth
firstappear above the throat
Fig. 12 plate. Screw (D) locks feed
tilting adjusting pin in place.
With the feed dogs at their highest point of travel, the top of the teeth on the
main feed dog (A) should be 3/64 inch above the throat plate. Now set chaining
feed dog teeth (B) flush with the top of throat plate.
SETTING THE LOWER KNIFE
Replace lower knife holder assembly. Lower
knife (A, Fig. 13) should be set with cutting edge
flush with throat plate surface. Adjustments are
made with hexagonal head screw which holds lower
knife. Lower knife is spring pressed against upper
knife, so no lateral adjustment is necessary when
width of trim is changed.
Lower knife may be secured in any position by
tightening screw (B) and locking nut (C) against sup-
port bracket. Because screw (B) also serves as
latch pin for the cloth plate latch spring, it should
always be locked with nut (C) even when screw is not
tightened against lower knife holder.
SETTING THE UPPER KNIFE
Replace upper knife assembly. Clamp upper knife Fig. 13
(D, Fig. 13) in position, setting screw (E) to hold
clamp (F) in its most clockwise position against upper knife. At bottom of its
stroke, front cutting edge of upper knife should extend not less than 1/64 inch
below cutting edge of lower knife.
11
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SETTING THE UPPER KNIFE (Continued)
After upper knife has been set for proper width of trim, screw (G) should
be tightened to lock upper knife holding block (H) in place. This will simplify
resetting when upper knife is replaced.
SETTING THE STITCH LENGTH
Length of stitch is determined by the feed eccen-
tric used. Note that part number of feed eccentric
in machine is No. 39540-12.
In assembling feed eccentric (A, Fig. 14), be
sure hubs side of eccentric is placed on right. Hub
side of feed eccentric spacer and oil slinger (B) should
be to the left. Use care in passing under oil tube (D)
to avoid loosening from its position. Be careful not
to damage shaft or key. Tighten nut (C) securely.
Be sure wool yarn in oil tube (D) touches feed eccen-
tric spacer and oil slinger (B).
To change feed eccentrics, remove nut (C) and oil
slinger (B) from end of shaft. Turn handwheel in
operating direction until key slot in eccentric is
toward front. Using hooked eccentric extractor (E),
supplied with machine, reach behind eccentric as
shown and withdraw eccentric. It may be necessary
to move handwheel back and forth sli g htly during
extraction.
Fig. 14
SETTING THE PRESSER FOOT
Fig. 15
Assemble presser foot to presser
arm. With needle in highposition, swing
presser arm into sewing position and lock
in place. If necessary, presser foot can
be reali g ned with throat plate slots by
shifting foot lifter lever shaft.
Foot lifter lever arm (A, Fig. 15)
and collar (B) secure the shaft. Be sure
presser arm does not bind and rise when
presser foot release bushing is unlocked.
To center presser foot and stitch tongue
with respect to throat plate needle hole,
loosen pr e sser foot hinge screw.
Adjust lifter lever stop screw (C) so that presser foot can be raised no
higherthanupperlooper will permit, then, lock nut(D). To find this maximum
safe position, turn the handwheel so point of upper looper is directly over
pre s ser foot tongue. Raise presser foot by depressing the presser foot treadle
and manually lower the toe of foot. Height adjustment is correct if presser
foot tongue does not contact the upper looper. There should be from 1I 16 to
1/8 inch free motion of foot lifter lever before presser foot begins to rise.
This adjustment is made with screw (E), locked with nut (F).
Finally, re-assemble chip guard, fabric guard, cloth plate.
12
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STARTING TO OPERATE
Be sure machine is threaded according to threading diagram (Fig. 1, page 7). With
thread tensions light, set looper thread eyelets (C & E) about horizontal and in th e middle
of their front to back locations. Operate machine slowly, without presser foot in place,
to make sure that chain forms and moves off the tongue freely. Swing presser foot into
position, insert material, and sew slowly.
NEEDLE THREAD CONTROL
While sewing on material, check needle thread control as follows: Usually all needle
thread is drawn on needle down stroke. At top of needle stroke, thread should be just
tight enough to feed chain off stitch tongue. Stitch tends to pull down slightly if excessive
thread is pulled on the up stroke. With needle at bottom of stroke, position needle thread
eyelet (R, Fig. 1) so that needle cam pull-off (S) just contacts needle thread. It is desire-
able to adjust the needle thread pull-off eyelet well forward (toward the operator) to delay
slightly, the tightening of the needle thread.
LOWER LOOPER THREAD CONTROL
With material under presser foot, set lower looper thread eyelet (E, Fig. 1) back far
enough so thread is a little slack when looper thread pull-off (T) reaches its most rear-
ward position. Looper thread pull-off (T) is set about 1/8 inch distance behind needle
thread cam pull-off (S). Frame looper thread guide (G) should be set with its left hand
eyelet approximately 1/8 inch right of lower looper (K) heel eyelet at the time lower looper
is at extreme left end of its travel.
While sewing on material, check drawing off of looper thread as follows: A portion of
lower looper thread should be drawn through the tension before lower looper thread comes
off upper looper. To increase amount of thread drawn through the tension while lower
looper thread is on upper looper, move lower looper thread eyelet (E) down. keeping the
same amount of pull-off action.
UPPER LOOPER THREAD CONTROL
Befor .e proceeding to adjust upper looper thread eyelet (C. Fig. 1) balance all three
tensions to give a normal appearing stitch. Moderate change in these tensions will not
markedly effect the purl.
During needle down stroke. forward stroke of looper thread pull-off (T) will draw
upper thread through the tension. When normal amount of looper thread is drawn, upper
looper thread will have almost all slack taken up as looper thread pull-off reaches its
most rearward position.
POSITIONING THE PURL
To move the purl more under the edge, both looper thread eyelets (C & E, Fig. 1)
should be raised keeping the same amount of pull-off. Usually it is better to have slightly
more pull-off on upper thread than on lower thread.
If it becomes necessary to move looper thread pull-off (T) be sure to take up all end
play in needle drive shaft before tightening. If upper looper is located so that it is higher
over throat plate than recommended in (Fig. 10). the purl will tend to form near top edge.
If upper looper is too low, the purl will form nearer bottom edge.
THREAD TENSIONS
The needle thread tension required is a function of needle thread and mat e rial being
sewn. In general, lower looper thread tension should be set as high as possibl e without
causing needle thread to be pulled down. Upper looper thread tension should be increased
as long as the elasticity of the chain increases, or until the purl is pulled too far over the top.
13
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Fig. 16
TO REMOVE CRANKSHAFT
Crankshaft c an be withdrawn easier if these steps are followed:
1. Drain oil by removin g plug screw lo-
c ated on back of ma c hine near bottom
edge of base.
2. Remove topandbottom covers of ma-
chine.
3. Removefeedeccentricnut(E, Fig. 16)
and, with the aid of the eccentric ex-
tractor, slip off the eccentrics (F).
4. Remove key (G).
5. R e m o v e
three counterweights (H).
Identify these counterweights so that
they will be re-assembled in the pro-
per places.
6. Remove screw (J) which holds crank-
shaft split bearing. This s'crew is
reached through bottom of bed casting.
7. Remove caps of bearings on crankshaft
at points A, B, and D. When re-
assembling bearing caps make sure
they are in their original position.
Trade marks are stamped on both
halves of the caps and both trade marks
should be on the same side ofthe bear-
ings. Also, screws should be re-
assembled in the same holes from
which they were removed.
8. Loosen clamp nut (A, Fig. 17)) which
holds upper knife driving arm (B).
Access to clamp nut is through top
cover. Draw driving arm to the left
until upper knife driving lever (C) and
connecting rod (D) drop, allowing re-
moval of bearing cap (E). This is at
bearing point (C, Fig. 16) on crank-
shaft. Observe same precautions when
re-assembling cap as described in 7
above.
9. Remove screw (K, Fig. 16) which holds
inner ri g ht crankshaft bearing. This
screw is reached through bottom of bed
casting.
10. Loosen two screws (L) in fan collar;
remove both halves of cooling fan.
11. Remove screw (M); take off pulley cap
(N).
12. Loosen two screws (P); remove pulley
(R).
13. Remove three screws (S); take off
bearing retaining plate (T).
14. Crankshaft maynowberemoved.
14
15. If necessary to replace ball bearing
(V), it should be pressed off shaft on
an arbor press. In replacing bearing
it must be pressed on carefully until
it seats against ground thrust washer
(U).
16. Carefully observing reverse of the
foregoing operations should simplify
re-assembly of crankshaft. Check-
ing exploded view drawings for loca-
tion of various parts and constant
testing for binds during re-assembly
will also prove helpful.
17. Before re-assembling, thoroughly
clean and dry top and bottom covers
and gaskets. Before re-assembling
bottom cover make sure that sprin g
pressed oil wick which lubricates left
crankshaft bearing is inserted in hole
in casting and that it contacts shaft .
The wick stands v e r t i c a 11y on its
spring against bottom cover. Coat oil
drain plug with a sealing compound be-
fore re-assemblin g to prevent oil
leakage. No. 1 Crane Lead Seal is
recommended.
Fig. 17
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ORDERING REPAIR PARTS
ILLUSTRATIONS
This catalog has been arranged to .::;implify ordering repair parts. Explod ed
views of various sections of the mechanism are shown so that the parts may be
seen in their actual position in the machine. On the page opposite the illustration
will be found a listing of the parts with their part number, description and the
number of pieces required in the particular view being shown.
Numbers in the first column are reference numbers only, and merely indicate
the position of that part in the illustration. Reference number should never be
used in ordering parts. Always use the part number listed in the second column.
Component parts of sub-assemblies which can be furnished for repairs are
indicated by indenting their descriptions under the description of the main sub-
assembly. Example:
41 29126 DF Lower Looper Drive Lever Connecting Rod Assembly----- 1
42 22729 D Screw - Connecting Rod Assembly------------------ 2
42A 22729 E Screw - Connecting Rod Assembly------------------ 2
43
97 Screw - Guide Fork, lower ------------------------ 2
44 39544 S Ball Joint Guide Fork----------------------------- 1
45
39544 U Lower Looper Bar Driving Lever------------------- 1
It will be noted in the above example that the eccentric, ball stud, and bearing
are not listed. The reason is that replacement of these parts individually is not
recommended, so complete sub-assembly should be ordered.
At the back of the book will be found a numerical index of all the parts shown in
this book., This will facilitate locating the illustration and description when only
the part number is known.
IDENTIFYING PARTS
Where the construction permits, each part is stamped with its part number. On
some of the smaller parts, and on those where construction does not permit, an
identification letter is stamped in to distinguish the part from similar ones.
PART NUMBERS REPRESENT THE SAME PART, REGARDLESS OF CATALOG
IN WHICH THEY APPEAR.
USE GENUINE NEEDLES AND REPAIR PARTS
Success in the operation of these machines can be secured only with genuine
Union Special Needles and Repair Parts as furnished by the Union Special Machine
Company, its subsidiaries and authorized distributors. They are designed according
to the most approved scientific principlesR and are made with utmost precision.
Maximum efficiency and durability are assured.
Genuine needles are packaged with labels marked ~ • Genuine
repair parts are stamped with the Union Special trademark. Each trademark is
your guarantee of the highest quality in materials and workmanship.
TERMS
Prices are net cash and subject to change without notice. All shipments are
forwarded f. o. b. shipping point. Parcel post shipments are insured unless other-
wise directed. A charge is made to cover postage and insurance.
15
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' ' I
27 24
16
From the library of: Superior Sewing Machine & Supply LLC

He f.
No.
1
2
3
4
5
6
8
9
10
11
12
13
14
15
16
17
18
19
20
21
21A
22
23
24
25
27
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
59
MAIN FRAME, MISCELLANEOUS COVERS, PLATES
Part
No.
39557 B
39557 E
39557 c
39557 F
39557
39556 A
39557 A
22541
39582 s
51-103 Blk
39582 L
39582 v
39582 AA
39563 F
22569 B
22571 E
22565
29477 GW
22743
39568 J
39568 G
39534 R
90
660-234
39594 A
22569
39501 A
39501
39501
c
39501 B
90
39532 A
39582 K
41071 G
86 X
22569 A
39594 G
39594 H
39578 BB
22569 D
39593 c
39593 D
660-243
39593 E
22894 AD
22565
39582 y
39582 X
22569 c
22586 R
22653 D-4
39582 F
39578 F
138
22657 D-12
39501 K
A mt.
Description Re q.
Presser Spring Plunger Cap Nut--------------------- 1
Presser Spring Plunger Locking Nut----------------- 1
Presser Spring Plunger Adjusting Screw ------------- 1
Lock Nut - Adjusting Screw------------------------- 1
Presser Spring------------------------------------ 1
Presser Foot Release Bushing---------------------- 1
Presser Spring Plunger---------------------------- 1
Screw - Top Cover--------------------------------- 8
Top Cover · ---------------------------------------- 1
Hinge Pin------------------------------------- 1
Oil Filler Cover------------------------------- 1
Spring---------------------------------------- 1
Top Cover Gasket---------------------------------- 1
Top Cover Needle Thread Eyelet-------------------- 1
Screw - Eyele~------------------------------------ 2
Oil Drain Plug Screw, magnetic--------------------- 1
Screw - Upper Looper Thread Tube Assembly -------- 1
Upper Looper Thread Tube Assembly---------------- 1
Screw - Tube Tension Spring-------------------- 1
Looper Thread Tub e Tension Spring------------- 1
Thread Tube---------------------------------- 1
Feed Bar Oil Shield-------------------------------- 1
Screw - Feed Bar Oil Shield ------------------------ 1
O il Tube Coupling---------------------------------- 1
Feed Bar Connecting Rod Oil Tube------------------- 1
Screw- Cloth Plate-------------------------------- 1
Cloth Plate, semisubm er g ed installation------------- 1
Cloth Plate, nonsubm er ge d installation--------------- 1
Cloth Plate, semisubm er g ed installation------------- 1
Cloth Plate, nonsubm er ge d installation--------------- 1
Screw - Latch Spring------------------------------- 2
Cloth Plate Latch Sprin g ---------------------------- 1
Feed Mechanism Cover----------------------------- 1
Nut - Feed Mechanism Cov e ~----------------------- 1
Screw - Feed Mechanism C ov e r------------ - -------- 1
Screw- Oil Screen and St ra i ne r--------------------- 3
O il Filter Screen------------------- - -------------- 1
Oil Strainer--------------------------------------- 1
Chip Guard---------------------------------------- 1
Screw- Chip Guard-------------------------------- 2
Oil Gauge Float------------------------------------ 1
Oil Gauge Indicator -------------------------------- 1
Oil Gauge Seal Ring------------------------- - ------ 1
Oil Sight Gauge----------------------------- - ------ 1
Screw - Lower Looper Bar Driv e L ever Sha f t--------- 2
Screw - Upper Looper Dr iv e L ever Shaft------------- 2
Bottom Cover Gasket ------------------------------ 1
Bottom Cove~---------------------------------- - -- 1
'icrew - Bottom Cover------------------------------ 14
Screw- Bottom Cov e r------------------------------ 1
Screw - Bottom Cover E xt ensi on -------------------- 2
Bottom Cover Extension---------------------------- 1
Cloth Pla te Fabric Gu a rd--------------------------- 1
Screw - Cloth Pla te Fabr ic Gu ar d ------------------- 2
Screw - Cloth Plate-------------------------------- 1
Stud - Cl oth Pla te---------------------------------- 1
17
From the library of: Superior Sewing Machine & Supply LLC

29
A - NEFDLE DRIVE BEAIIJNG
B - SPllEADER - Uf ·pfR LOOPER ~~~~
DRIVE u EAHII" G
C - U
PPER KNIF[ DIUVE nr . A'" """'
D - LOWEH LOOPER DRIVE BEA
18
From the library of: Superior Sewing Machine & Supply LLC

Ref.
No.
1
2
3
4
5
6
6A
6B
7
8
9
10
11
12
13
13A
14
14A
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
Part
No.
22769 A
39521 A
39521
95
39590 H
22569
39590 s
39590 R
660-268
39590 G
39590 J
39591 G
39591 H
22894 D
39590 K
22565 F
39590 p
77 Q
39522 E
39590 D
97 A
22747 B
39591 B
39591 A
22747 B
39590 N
39691
22747 B
39541
666-94
39590
39590 T
39555 E
39142 G
39573 K
39573 AA
39552 u
39544 L
CRANKSHAFT MECHANISM AND BUSHINGS
Amt.
Description
Req.
Screw
1
for pulley cap------------------------------- 1
Pulley Cap ---------------------------------------- 1
Pulley -------------------------------------------- 1
Screw ----------------------------------------- 2
Crankshaft Ball Bearing Retaining Plate-------------- 1
Screw--------------------------------------------- 3
Spacer Collar-------------------------------------- 1
Ball Bearing Stop Collar---------------------------- 1
Crankshaft Ball Bearing ---------------------------- 1
Crankshaft Ball Bearing Housing--------------------- 1
Thrust VVasher------------------------------------- 1
Crank Chamber Cooling Fan------------------------- 1
Crank Chamber Cooling Fan Collar ------------------ 1
Screw--------------------------------------------- 2
Crankshaft Bearing
1
inner right --------------------- 1
Screw--------------------------------------------- 1
Oil Slinger Collar---------------------------------- 1
Screw ----------------------------------------- 2
Crankshaft ---------------------------------------- 1
Crankshaft Split Bearing---------------------------- 1
Screw
1
for split bearing------------------------- 2
Screw
1
for crankshaft counterweight ----------------- 2
Crankshaft Counterweight~ right--------------------- 1
Crankshaft Counterweight
1
middle ------------------- 1
Screw
1
for crankshaft counterweight ----------------- 2
Stud
1
for crankshaft split bearing-------------------- 1
Crankshaft Counterweight~ left ---------------------- 1
Screw
1
for crankshaft counterweight ----------------- 2
Feed Driving Eccentric Key------------------------- 1
Oil VVick and Spring -------------------------------- 1
Crankshaft Bushing
1
left---------------------------- 1
Crankshaft Bushing
1
inner left----------------------- 1
Foot Lifter Shaft Bushing~ left----------------------- 1
Foot Lifter Shaft Bushing~ right --------------------- 1
Upper Knife Driving Arm Bushing~ left--------------- 1
Upper Knife Driving Arm Bushing~ right-------------- 1
Needle Driving Arm Crank Bushing ------------------ 1
Lower Looper Bar Bushing-------------------------- 1
19
From the library of: Superior Sewing Machine & Supply LLC

20
From the library of: Superior Sewing Machine & Supply LLC