UnionSpecial 63400 Series Instruction sheet

From the library of: Superior Sewing Machine & Supply LLC
®
QUALITY
STYLES
63400A
634008
CATALOG ·
No.
121 M
SECOND
EDITION
Ztnu,n~
L E W I s® • C O L U M B I A®
CLASS 63400
STREAMLINED
INDUSTRIAL
SEWING
MACHINES
HIGH SPEED LOCKSTITCH MACHINES
UNION SPECIAL CORPORATION
CHICAGO

From the library of: Superior Sewing Machine & Supply LLC
Catalog No. 121 M
INSTRUCTIONS
FOR
ADJUSTING AND OPERATING
LIST OF PARTS
CLASS 63400
Streamlined Lockstitch
Styles
63400 A 63400 B
Second Edition
@ 1961
By
Union Special Corporation
Rights Reserved in All Countries
UNIO N SPECIAL CORPORATION
INDUSTRIAL SEWING MACHINES
CHICAGO ·
Printed in U.S.A.
2
August, 1981

From the library of: Superior Sewing Machine & Supply LLC
IDENTIFICATION OF MACHINES
Each UNION SPECIAL machine is identified by a Style number which is stamped into 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
63400 A". 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 63400 AZ".
Styles of machines similar in construction are grouped under a class number which differs
from the style number, in that it contains no letters. Example: "Class 63400
11
•
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 Styles of machines in this Class. Refer-
ence to direction, such as right, left, front, back, etc., are given from the operator's posi-
tion while seated at the machine. Operating direction of the handwheel is toward the operator.
STYLES OF MACHINES
High Speed Streamlined Long Arm Lockstitch Machines, One Needle, Light, Medium and Heavy Duty,
Drop Feed, Rotary Hook, Horizontal Hook Shaft, Push Button Stitch Regulator, Stitch Length In-
dicator, One Reservoir Enclosed Automatic Lubricating System, Head Oil Siphon, Adjustable Hook
Oil Control, Automatic Head Oiling, Needle Bearing Adjustable Feed Eccentric, Needle Bearings
for Take-up Lever and Needle Bar Driving Link, Feed Timing on Lower Main Shaft, Maximum Work
Space to Right of Needle Bar 11 1/8 Inches,
*63400 A For miscellaneous plain seaming operations on light and medium weight work, 1 9/64
inch needle bar travel. Type 183 GXS or 183 GYS needle. Specify presser foot, throat
plate, feed dog, stitches per inch, thread size, needle type and size, attachments and
guides.
63400 B For miscellaneous plain seaming operations on medium and medium heavy weight work,
1 13/64 inch needle bar travel. Type 180 GXS or 180 GYS needle. Specify presser foot,
throat plate, feed dog, stitches per inch, thread size, needle type and size, attachment
and guides.
* DISCONTINUED - In most instances, component parts can be ordered for customer repair.
NEEDLES
Each needle has both a type and size number. The type number denotes the kind of shank,
point, length, groove, finish and other details. The size number, stamped on the needle shank,
denotes largest diameter of the blade measured across the eye. Collectively, the type number
and
the size number represent the complete symbol.
Needle Type 180 GXS or 180 GYS is recommended for Style 63400 Band needle Type 183 GXS
or 183 GYS is recommended for Style 63400 A. Their description and the sizes available are
listed below.
Type
No.
180 GXS
180 GYS
183 GXS
183 GYS
Description and Sizes
Round shank, round point, lockstitch, short length, ball eye, single groove,
wide angle groove, struck groove, deep spot, ball point, chromium plated -
sizes 075/029, 080/032, 090/036, 100/040, 110/044, 125/049, 140/054, 150/060.
Round shank, round point, lockstitch, short length, ball eye, single groove,
wide angle groove, struck groove, deep spot, chromium plated - sizes 075/029,
080/032, 090/036, 100/040, 110/044, 125/049, 140/054, 150/060.
Round shank, round point, lockstitch, extra short length, ball eye, single
groove, wide angle groove, struck groove, deep spot, ball point, chromium
plated - sizes 025, 075/029, 080/032, 090/036, 100/040, 110/044.
Round shank, round point, lockstitch, extra short length, ball eye, single
groove, wide angle groove, struck groove, deep spot, chromium plated - sizes
028, 080/032, 090/036, 040, 044.
3

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NEEDLES (Continued)
To ha ve needle orders promptly and accurately filled, an empty packa g e, a
sampl e ne e dle, or the type and size numb er should be forwarded. Use descrtption
onlab e l. A complete order would read:
11
1000 Needles, Type 180 GXS, Siz e 080/032'~
Selection of proper needle size should be de termin ed by the siz e of th e thread
u se d. Thread should pas s fr e ely through th e needl e eye in ord er to produc e a good
stitch formation.
SELECTING THE SIZE OF THE NEEDLE
The strength requirement of the seam produced -.is lar g ely dependent upon the
size of the th r ead employed.
The followin g table shows the preferred size of needle for a g iv en size and kind
of thread. The choice, however, should g ive consideration to factors r efe rr e d to
above, which may dictate the selection of a needle size sli g htly lar g er or smaller
than the size specified.
Cotton Thread
Size
0
30
36
40
50
60
70
80
90
100
Mercerized Thre ad
Size
B
A
A
0
00
000
0000
0000
IDENTIFYING PARTS
Ne edle
Size
15 0/060
140/054 to 150/060
125 / 049 to 140/ 054
110/044 to 125/049
110/044 to 125/049
100/ 040 to 110/ 044
090/036 to 100/040
080/ 032 to 090/ 036
080/ 032 to 090/ 036
075/ 029 to 080/ 032
Where the con s truction permits, each part is st a mp ed with it s part numb e r.
P a rts too small for a complete catalog stampin g are identified by letter symbols
which distingui sh one part from another that is similar in appearance.
Pa rt numb ers r e pre se nt the same part, re ga rdless of the cat a lo g in wh ic h th ey
a
pp ea r .
IMPORTANT ! ON ALL ORDERS, PLEASE INCLUDE PART NAME AND ST Y LE
OF MA C HINE FOR WHIC H P ART IS ORDER ED .
4

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ORDERING OF REPAIR PARTS
ILLUSTRATIONS
The arrangement of this catalog is to facilitate easy and accurate ordering of
Class 63400 replacement parts.
Six exploded view plaues cover the Standard Styles listed in this catalog. Each
plate presents a sector of the machine, parts being aligned as in their assembled po-
sition. Small keyline views show by a blackended area exactly where the parts being
discussed fit in the assembled machine. On the page opposite the illustration will be
found a listing of the parts with their part numbers, descriptions 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 the part in the illustration. Reference numbers should never be used in
ordering parts. Always use the part number listed in the second column. Each exploded
view plate carries a reference number for each part for sale.
Sub-assemblies, which are sold complete, or by separate part, are in a bracket
or a solid line box on the picture plate. 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:
20
21
22
23
29126
DD
61438 B
660-225
88
Feed Driving Eccentric and Connecting Rod Assembly------------ 1
Feed Drive Eccentric Connecting Rod---------------------- 1
Needle Bearing------------------------------------- 1
Set Screw------------------------------------------- 1
In those cases where a part is common to all of the machines covered by this
catalog, no specific usage will be mentioned in the description. However, when the
parts for the various machines are not the same, the specific usage will be mentioned
in the description, and, if necessary, the difference will be shown in the illustra-
tion.
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.
USE GENUINE REPAIR PARTS
Success in the operation of these machines can be secured only with genuine
UNION SPECIAL Repair Parts as furnished by the Union Special Corporation, its subsid-
iaries and authorized distributors. They are designed according to the most approved
scientific principles, and are made with utmost pr e cision. Maximum efficiency and
durability are assured.
TERMS
Prices are strictly net cash and subject to change without notice. All shipments
are forwarded f.o.b. shipping point. Parcel Post s hipments are insured unless other-
wise directed. A charge is mad e to cover the postage and insurance. ·
5

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INSTALLING
CAUTION! When unpack ing, DO NOT lift machine out of box by placin g one hand on handwheel. Usin g both hand s
on
bed casting, h ft g ently .
Before leavin g factory, each UNION SPECIAL machine is sewed off, inspected and carefully packed, After the
mac h i ne and accessories have been removed from the packin g box, the followin g steps should be followed :
PREPARATION OF MACHINE FOR INSTALLATION
A ba g of assembly parts, consisting of one frame thread eyelet , one eyelet attachin g screw, one extra bobb in, two
hi nge studs, and two screws for holdin g miscellaneous attachments to the be d plate, is packed wi th each machine.
Insert hin ge studs in holes provided for them in rear of cloth plate. Assemble the upper frame eyelet (A, F i g. 2).
STANDARD ACCESSORIES
Included also with each machine is a box of STANDARD ACCESSORIES--conta i nin g one bobbin winder assembly, th e
machine mountin g frame, one oil drain jar and its clamp sprin g, one knee lifter assembly and i ts rubber pad , bed
positionin g sprin g and screw, four isolator pads and c ips, and one mach i ne rest pin. These parts are ess e ntial wh n
set ti ng up the mach i ne.
TABLE TOPS
Lockstit ch machines are i nstalled m table tops, prepared with cut-out, so that the bed plate is FLUSH wi th the top
of the machine mountin g frame.
MACHINE MOUNTING FRAME INSTALLATION
On a suitable ta bleboard, place mach i ne mount ing frame (21393 N) in the mac hi ne cut-out with the hin ge lu g s to the
rear (F ig. 1). Inse rt the countersunk wood screw throu gh left hinge pad and ti g hten se c urely. As semble bed po si t i onin g
sprin g (63474 A) over ri g ht hin ge pad; insert round head w ood screw and tig hten securely. Assemble the retain ing plate
(213 93 R) to outside front of pan section, as shown, and snu g up nuts li g htly.
Place sew ing head in the frame mountin g, and af ter be ing sure there is about 1/ 16 inch clearance betw e en the cloth
plate ed ge and the frame sides, rap the retain ing plate smartly upward with a hamme r to insure a g ood g rip on the
u nders id e of the board and ti g hten lockin g nuts securely.
Tip mach i ne ba ck a gai nst rest pin, and assemble the knee press assemb ly as shown. A ll end play of the c ross shaft
should be taken up by t he cone bearin g s, but must not bi nd.
2 28 46Q- l6
6347 6
6347 6A ---
TABLE
BOAR D
il 663 D
21393N _/ &._
61477
Fig. 1
6

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INSTALLING (Continued)
MA C ffiNE MOUNTING FRAME INSTALLATION (Continued)
Before the machine is put into production, the bell crank (21665 J) of the knee lifter rod should be
adjusted. The left stop screw (22597 F) should be set so that the maximum lift of the presser bar and its
parts do not interfere with moving parts within the head. This may be done by settin g the s top s crew so that
the presser bar raises approximately 5/16 inch.
BOBBIN WINDER
The bobbin winder should be secured to the table top so that its pulley will be locat ed directly in front of
the sewin g machine belt and will bear ag ainst the belt when in operation. The base of the winder has two
elongated attaching holes, which allow the mechanism to be moved closer to or farther away from belt as
needed. The pulley of the winder, when in operation, should exert only enough pressure ag ainst the belt to
wind the bobbin. Regulation and operat i on of the bobbin winder is described under "Windin g the Bobbin",
under OPERATOR'S INSTRUCTIONS.
BELTS
These machines are equipped to use either #1 "Vee" or round belts.
Fig. 2
7

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LUBRICATION
CAUTION! Oil has been drained from the main reservoir before shipment and the
reservoir must be filled before starting to operate.
Lubricate machine thoroughly, in accordance with instructions which follow, and run
slowly for several minutes to distribute the oil to the various parts. Full speed operation
can then be expected without damage.
RECOMMENDED OIL
Us3 a stainless water-white straight mineral oil ofa Saybolt viscosity of 90 to 125 seconds
at 100 Fahrenheit in the main reservoir. This is equivalent to Union Special specification
No. 175. Fill main reservoir at plug screw (B, Fig. 2) and check oil level at gauge (C); oil
is at maximum level when needle is in yellow band marked "full". Oil should be added when
needle is in yellow band marked "low".
It is recommended that a new machine, or onethathasbeen out of servicefor an extended
period, be lubricated as follows: Remove the end cover and directly oil the bearings of the
needle bar link, take-up and its lever and needle bar. Replace end cover as no further hand
oiling will be required.
CAUTION! The machine is provided with automatic or manual head mechanism oil
control. The oil control dial (D, Fig. 2) is shown in the automatic oiling position, and should
manual giling of the head mechanism be desired, remove locking screw (G, F i g. 2) and turn
dial 180 to expose the manual oiling port. In the manual oiling position, five or six drops of
oil should be introduced into the oiling port twice daily - preferably at starting time and
mid-day.
Oil may be drained from main reservoir by removing plug screw (F, Fi g. 2).
OIL GAUGE
The oil gauge is set at the factory to show the proper oil level in the reservoir. Should
an adjustment become necessary, the following steps should be followed:
1. Place the machine upright on a level table or bench.
2. Remove the reservoir plug screw (located below the handwheel and near the bottom of the
machine).
3. Oil should be added or removed so that th e oil level is approximately 1/ 8 inch below the
bottom edge of the hole.
4. Loosen the lock nut on the calibratin g screw, and turn the screw left or right so that the
gauge needle rests on the ye llow band marked
II
FULL" on gauge ( C, Fig. 2).
5. Tighten lock nut and replace plug screw.
Fig. 3
L ubrication ofthe mechanism below the cloth plate
is automatically accomplished through the feed driving
shaft (D, Fig. 3), which is tubular. Oil is i ntroduced
into the shaft at the sp r ocket e nd by means of an oil
distributing plate (A, Fig. 3) which is secur ed to the
bottom cover (B) by means of two scr e ws ( C).
Should it become necessary to remov e th e re s ervoir
cover, it is imperative that the adju stm ent of the oil
distributing plate (A) be checked very c are fully . This
can be done by removing the large plu g s crew at the
right end ofthe reservoir and l oo k in g throu gh the hole.
The low point of the oil distributing plat e mu st be eve n
with or slightly below the center of shaft (D) and just
touching it.
8

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SEL F- P RIMING HEAD OIL SIPHON
Class 63400 mach in es ar e e quipp ed with a self-priming head oil siphon. When th e
machine is started, oil spl a sh es on th e primin g cup felt, filters through the felt and trickles
down the vertical oil tub e, thus priming th e si phon. Once the prime is established, it is
maintained, unless the f elt s ar e r e mov ed. Th e siphon operates twenty-four hours a day,
removing oil that accumulates in the head, even when the machine is not running.
614 94 L
Scr e w----.J.:
61494 N
r-----~':'---- Retainin g
£ND
INST ALLING AND MAINTENANCE OF OIL SIPHO N
Gromm et
666-237
Primin g
Cup
Felt
63 494 D
Oil Siphon
63994 B
Oil Tube
The felt in the priming cup is designed for a sp e cific purpose. This felt, No. 666-23 7
is thin and relatively dense to meter the flow of priming oil and to prevent the entrance of
air. The felt, at the intake of the siphon, keeps the siphon clear of lint, and prevents th e
entrance of air at that point.
A newly installed siphon starts its act i on w ithin five to ten minutes after the ma chine is
operating. However, it may be forty minutes or so be fore the air is removed from the line
and the siphon is in full operation.
When a customer receives a new machine, it ha s probably been tu rned upside do wn in
shippin g, oil has accumulated in the head, a nd the siphon may not be pr i med. It will,
however, automatically reprime itself when run. After the first day of operation, th e
siphon can be checked by inspecting the tygon tube at the junction visible at the pr ess er foot
lifter arm to be sure it is full of oil.
The siphon may also be checked by removin g the head cover and w ett ing th e i nl et f elt
with oil. The felt should visibly dry out as the oil is drawn into the s iphon.
If the siphon felts become clogged and the siphon does not fu nction pr op e rly, ch an ge th e
felts as follows:
To change th e inlet fe lt, remo ve the inlet tube with th e ty g on tub e disconn e ct ed only at
the column end. Repl a ce the felt and reassemble.
To change the prime cup felt, fir st remov e th e acce ss plu g screw at th e r ear of the
column. Remove felt with a tweezers. Replace with a new felt bein g sur e the f elt is pushed
down ti ghtly into the prime cup.
9

From the library of: Superior Sewing Machine & Supply LLC
INSTRUCTIONS FOR OPERA TORS
THREAD
While the direction of the twist in the bobbin thread is immaterial, the direction
of the hook rotation favors the use of a left twist thread in the needle. To determine
the direct i on of twist, grasp a short length of thread between thumb and forefinger
of each hand. Turn the thread a way from you with your right hand. If the strands
unwind, it is a left twist, if not, it is a right twist.
REMOVING THE BOBBIN CASE
To remove the bobbin case, turn handwheel in operating
direction until the needle reaches its highest position. Using
the left hand, reach under the table, open the bobbin case
latch (A, Fig. 4), and pull the bobbin case out of the sewing
hook.
Fig. 4
WINDING THE BOBBIN
Opening the latch retains the bobbin in the case. When
the latch is closed, the bobbin is released and can readily
be removed.
Thread the bobbin winder by leading the thread
from the supply down through the eyelet (A, Fig. 5),
down between the tension discs, and under the tension
post. Press an empty bobbin on the winder shaft (B)
up to the stop, wind the end of thread around the bobbin
a few turns in a clockwise direction, and press down-
wardly on hand lever (D) until pulley is moved into
contact with machine belt, and is locked in that
position. When the machine is operated, the bobbin
will be rotated and filled until the thread engages the
automatic throw-out member, which disengages the
pulley. The extent to which the bobbin is filled can be
varied by regulating the screw ( C).
The tension post bracket is mounted on the winder
base, and can be shifted from left to right by loosening
screw (E) so that any tendency of the bobbin to wind
unevenly may be readily corrected.
The purpose of the bobbin winder is to assure an
Fig. 5
operator of a full bobbin at all times. When the bobbin in the machine is used up,
replace it with the full one, and begin to wind the empty one immediately. Bobbins
can be rewound while the machine is sewing.
Fig. 6
THREADING THE BOBBIN CASE
The bobbin case should beheld between the thumb,
forefinger and second finger of the LEFT hand
(A, Fig. 6).
The bobbin itself should be held between the thumb
and forefinger of the right hand (B, Fig. 6) with
thread coming off the bottom of the bobbin.
10

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INSTRUCTIONS FOR OPERATORS (Continued)
THREADING THE BOBBIN CASE (Continued)
Place the bobbin in the bobbin case. In one continuous motion, with the thumb
and forefinger of the right hand, draw the bobbin thread through the diagonal slot in
bobbin case (A, Fig. 7) under the tension spring (B) and into self threading eyelet
(C) on case. Note the direction of the rotation of the bobbin as the end of the thread
is pulled when looking at the bobbin case from the back. The bobbin should rotate
counterclockwise.
REPLACING THE BOBBIN CASE
Have the needle bar at its highest position, allow about two
and one half inches of thread to hang free. The bobbin case
latch should be opened with the left hand, and by reaching under
the table and through the opening in the table, it should be placed
C part way into the sewing hook. The latch should then be released
and bobbin case snapped into position.
INSERTING THE NEEDLE
Fig. 7
Insert the needle into the needle bar as far
as it will go with the spot ( sometimes called scarf) toward the right,
facing the handwheel. Tighten set screw securely.
The cross hole in the needle bar, about 1/ 4 inch from the end
(A, Fig. 8), is to show the operator when the needle has been
inserted as far up as it will go, and to provide a means for cleaning
the accumulated lint from needle hole so the needle will seat properly.
THREADING THE NEEDLE
Threading diagram (Fig. 2) shows the places where the needle
Fig. 8
thread passes. Please note that the needle thread passes through the needle eye
from left to right.
PREPARATION FOR SEWING
With your left hand, hold the end of the needle thread, leaving it slack, and turn
the handwheel in operating direction until the needle moves down and up again to its
highest position. Pull up the needle thread and the bobbin thread will come up with
it through the needle hole in the throat plate. Draw both threads under the presser
foot.
8
TENSIONS
A perfect stitch is one in which the needle thread and bobbin
thread are locked together in the center of the material being
sewed. A stitch of this kind is secured by regulating the
tensions on both threads.
BOBBIN THREAD TENSION
The tension on the bobbin case is applied by means of a set
Fig. 9 screw (A, Fig. 9) which regulates tension spring (B). The
tension on the spring is correct when it is just sufficient to hold
the bobbin case and l?obbin suspended by th~ bobbin thread. The thread should not be
in the eyelet for this adjustment check.
11

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INSTRUCTIONS FOR OPERA TORS (Continued)
BOBBIN THREAD TENSION (Continued)
Remove the bobbin case from its holder and turn set screw in spring in a
clockwise direction to apply more tension or counterclockwise to release tension.
When the bobbin thread tension is correct, it rarely becomes necessary to make
any changes as varying the needle thread tension will usually attain a good stitch.
NEEDLE THREAD TENSION
The needle thread tension is varied by turning the tension regulating nut
(H, F i g. 2). Turning the nut in a clockwise direction increases the tension, while
counterclockwise decreases it. This should not be done when the presser foot is in
its raised pos i tion, but is generally done while the machine is sewing on a piece of
scrap material.
TO CHANGE THE STITCH LENGTH
Press plunger (J, Fig. 2) in firmly. While holding plunger in, turn handwheel
in op e rating direction until stitch regulating finger is felt to drop into the slot of
feed eccentric. Continuing to hold the plunger in, turn handwheel in operating
direction to increase the stitch length and in opposite direction to decrease the
stitch length.
Stitch lengths are indicated by graduations on the indicator
dial and are viewed through the window in the belt guard
(K, Fig. 2).
PRESSURE ON MATERIAL
The presser spring should exert only enough pressure to
make the work feed uniformly. To increase the pressure on
the presser foot, turn presser spring regulator (A, Fig. 10)
in clockwise direction. Turning the regulator counterclockwise
decreases the pressure.
12
Fig. 10

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INSTRUCTIONS FOR MECHANICS
SETTING THE NEEDLE BAR TO HEIGHT
The lower needle bar bushing, the one to which the needle bar is timed, is set
at the factory. The distance from the bottom of bushing (A, Fig. 11) to the throat
plate seat is 2 1/ 4 inches.
Fig. 11
The four lines engraved on the needle bar are used in setting
needle bar to height and are referred to as TIMING LINES. The two
upper lines are used with the extra short length needle Type 183 GXS
or 183 GYS, which are recommended for Style 63400 A.
The two lower lines are used with the short length needle Type
180 GXS or 180 GYS, which are recommended for Style 63400 B.
When the needle bar is at its lowest position, the upper timing
line (B, Fig. 11) (of the pair selected) dependent upon the needle used,
should be EVEN with the lower edge of the lower needle bar bushing
(A).
To change the position of the needle bar, turn the handwheel until
the bar is at its lowest position. Then, loosen the clamp screw (C) and
move the bar to the proper timing line, Keeping the needle bar link at
its lowest position, tighten screw securely.
The illustration (Fig. 11) shows the proper setting of the needle bar on Style
63400 A, using extra short length needle., Type 183 GXS or 183 GYS. The setting
of the needle bar on Style 63400 B, using short length needle, Type 180 GXS or
180 GYS, is accomplished in the same manner, except that the lower pair of timing
marks on the bar is used.
TIMING THE HOOK
Tip the machine back so that it rests on the rest
pin in the table top. Insert a new needle. Loosen the
two screws and swing out the bobbin case positioning
finger (A, Fig. 12). Loosen the three set screws (B)
in the hook and hold the hook and bobbin case holder
in such a position as to prevent interference with the
needle. Turn the handwheel in operating direction until
the needle bar is at its low est position and continue
to turn the handwheel until the needle is ascending and
the lower timing mark (of the pair selected) (Fig. 11)
used in setting the needle bar is even with the lower
edge of the needle bar bushing (A).
Fig. 12
Turn the hook on the shaft until the point of the hook is even with the center of
the needle and as close to the needle as possible without deflecting it. A spacin g of
•003 to • 005 inch between the needle and the point of the hook is satisfactory. With
the hook in this position, tighten the set screw opposite the hook point securely.
Then, tighten the two remaining screws securely and recheck the timing of the hook
with the needle, at which time, the top of the eye of the needle should be about 1/64
inch below the bottom of the hook point. If this condition does not exist, recheck the
setting of the needle bar bushing in relation to the throat plate seat (Fig. 11).
Adjust the bobbin case holder positioning finger by turning the bobbin ca s e holder
until the finger recess is at the top. Place the projection on the finger into the bobbin
case holder recess and tighten the finger attaching screws securely, allowin g 1/32
inch clearance between the outside edge of projection and the inside edge of bobbin
case recess (Fig. 12).
13

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INSTRUCTIONS FOR MECHANICS (Continued)
NEEDLE GUARD INSTRUCTIONS FOR NO. 29474 P
In the hook, at the right side of the needle hole in the bobbin case holder
(B. Fig. 13) is found a needle guarding surface (A, Fig. 13).
The purpose ofthis guarding surface isto prevent the hook point (C) from coming
in contact with the needle (D) at loop-taking time, should the needle be deflected
toward the hook point. The needle guard will deflect the needle slightly. when needle
is at bottom of its vertical travel, if the hook is properly timed. (At loop-taking
time, there should be little or no deflection of needle by the needle guard.)
For additional needle clearance, especially with use
of size . 048 and larger needles, removal of some needle
guarding surface may be necessary.
Before metal removal from the guarding surface, all
related settings should be checked as follows:
1. See that the needle bar is set to correct height.
2. Check for proper hook timing.
3. Rotate handwheel in operating direction by hand.
Check for excessive needle deflection beyond what is
cited above as a desirable condition. Fig. 13
4. If needle deflection is excessive, follow steps 1 and 2 below.
(1) Remove bobbin case holder from hook.
(2) Remove excess metal from needle guarding surface. This may be done by
using a 1/8 inch strip of fine emery cloth (#320), with one end secured to the
bench and rubbing the guarding surface back and forth until sufficient metal
is removed. When metal is being removed from needle guarding surface,
the bobbin case holder should be re-inserted frequently and tested until proper
needle guarding is obtained.
CAUTION! Damage to hook point may result if too much metal is removed from
needle guarding surface.
The bobbin case holder should be thoroughly cleaned before re-assembly into
hook base.
When altering needle guarding surface, it is suggested the hook NOT BE
REMOVED or disturbed from its timed position.
Bobbin case holder only may be removed by removing gib screws and gib and by
pull i ng on bobbin case stem as the handwheel is rocked backwards and forwards
slightly.
HOOK LUBRICATION
CAUTION! Do not run the machine without the bobbin case in the hook as hook
damage may result.
With the bobbin case in the hook, run the machine for a full minute. Place a
piece of white paper directly under the hook and continue running the machine. After
about five seconds, remove the paper and a definite and distinct pattern of oil spots
should be observed.
14

From the library of: Superior Sewing Machine & Supply LLC
INSTRUCTIONS FOR MECHANICS (Cont i nued)
HOOK LUBRICATION (Continued)
Should more or less oil be
required, turn the oil control adjust-
ing shaft (E, Fig. 2). located on th e
front cf the machine just below th e
cloth plate surface, in the direct i on
of the change required. After a
change in the hook o il flow. th e
machine should be run about one
minute before checking for th e
desired oil flow.
FEED DOG HEIGHT
In regulating the height of the
feed dog, it should be at its highest
position and the presser foot resting
directly against it.
The feed dog holder attaching
Fig. 14 screw (A, Fig. 14) should be loosened
slightly, and regulating screw (B)
should be turned either clockwise, to raise the feed dog, or counterclockwise to
lower it. Make sure that the bottom of ~he shank of the feed dog holder rests against
the head of the regulating screw.
1
A suggested initial setting is as follows:
Feed dogs having 22 or more teeth per inch
should show about 3/ 64 inch above the throat
plate at highest point of travel. Those having
16 or less teeth per inch should show the
depth of a full tooth above the throat plate.
Fig. 16
The feed dog can
be tilted up or
down as required
by 1o o s e n i n g
screws (A and C).
Loos en feed
dog holding
s c r e w s ( D ) t o Fig. 15
s pa c e the feed
dog, front to back or sideways in the throat plate.
PRESSER BAR CONNECTION
The presser bar connection (A, Fig. 16) should be set
so that it is about 1/ 16 inch below the presser bar guide
(B). This is accomplished by tipping the machine back
against the rest pin, loosening the lock nut (A, Fig. 15),
and relocating the stop screw (B) on the lifter lever bell
crank (C). By turning the stop screw to the right or left,
the proper setting of the presser bar connection is
accomplished. Tighten the lock nut (A) to lock the stop
screw in place.
15

From the library of: Superior Sewing Machine & Supply LLC
INSTRUCTIONS FOR MECHANICS (Continued)
PRESSER BAR GUIDE
When locating the presser bar guide (B, Fig. 16), the presser foot must rest
directly against the throat plate with the feed dog in its lowest pos i tion. The guide
is set properly when there is a 4 3/ 4 inch space between the thread take-up wire and
the top of the throat plate ( Fig. 16)
To obtain th is setting, remove the pressure from th e pr e sser s prin g (F) and
loosen set screw (C). Tap on presser foot to i nsure its be in g down on th e throat
plate. Set the guide to the 4 3/ 4 inch dimension, center th e foot by turn ing it so that
the needle enters the mi ddle of its slot and retighten screw (C) in g uid e. Now, apply
pressure to the presser foot by tu r ning the regulator (A, Fi g. 10) clockw i se .
PRESSER BAR
The presser bar No. 63457 J is desi gned primarily to r eceive Uni on Specia l
presser feet. However, should feet of a different manufactur e be r e quir d, th e
presser bar is adaptable.
To adapt the machine to receive pr es se r f eet of other manufactur e, proceed as
follows:
1. Remove presser foot and pr esser foot sc re w from pr e sser bar.
2. Insert Presse r foot screw in th e pr es s er bar so it scr ews in from rig ht to left.
3. Loosen the set screw in the pr e ss er bar guide and r ot ate p resser bar 180° using
the screw as a handle.
4. Attach presser foot to th e bar a nd a li gn th e n ee d le hol e or s lot of the foot with
the needle.
5. Check the pr sser bar gu id e for corr e ct h eig ht and t ·g ht en se t s c re w se cu rely.
CAUTION! When presser f ee t oth er than of Un i on Sp ec ial m a nufactur e ar used,
the presser guide height must be ch e ck d a nd rese t wh ere ne c essar y.
TENSION ASSEMBLY A DJUSTMENT
Test check s pring tension (A, F ig . 1 7). Th er e
should be enough tension to assur e a g ood re turnin g
snap when sprin g is de press ed a nd r el ease d. Should
it require adjustin g, loos en s et screw in th e h ea d
located under arm and to th e ri g ht of tens ion
assembly, and r e mov e tens i on as s e mbly. Par ti ally
loosen tension post se t screw (B) in t en si on post
socket (C). Turn th e tension post (D) count er c lo ck -
wise until the ch e ck sprin g mov es away from th e
upper stop (E) and has no te nsion on i t. Tu r n th e
tension post (D} in a clockwis e di rection until th e
spring again touch es the uppe r 8top (E). Th en ,
proceed further in the sam e direction u nt il th e
desired ten si on is obtained. Wh en c orr ec tly se t,
D
Fi g. 17
the tension po st s et s cr ew (B) s hould be d ra wn up snu g ly, yet not for ce fully . Fur th er
adjustm e nt of th e ch e ck sprin g tens ion can be ma de by i ns er ting a s cr e wdr i ver in to
the slotted end of th e t en si on post (D) a nd turnin g in th e r e qu i re d dir ec ti on.
Replace te nsion a ss e mbly wi th th e ch e ck spr ing about 3/ 8 i nch a bov e th e th rea d
take-up wir e. While the tens i on po st asse mb ly is be ing r e pl a ce d, th e pr ess er foot
should be restin g on the throat pl at e.
16

From the library of: Superior Sewing Machine & Supply LLC
INSTRUCTIONS FOR MECHANICS (Continued)
TENSION RELEASE
The tension release should be set so that it will not release when sewing over
seams or when the presser foot is raised for back tacking. The adjustment of the
tension release cam (D, Fig. 16) and the in and out position of the tension assembly
are required for proper operation.
The in and out position of the tension assembly is correct
when the tension discs are in line with the check spr i ng eyelet
(A, Fig. 18). Set the stop screw (B, Fig. 18) so that when
the flange of the tension assembly rests against it, this
position is maintained. Tighten the tension assembly set
screw.
The tension release cam (D, Fig. 16) should now be
positioned by loosening set screw (E, Fig. 16) and then
raising or lowering the cam to suit the sewing conditions,
the average release point being between 1/ 4 to 5/ 16 inch
of presser foot lift above the throat plate. Tighten tension
release cam set screw securely.
THREAD CONTROL
Fig. 18 Check the adjustment of tension assembly (A, Fig. 18A).
Check spring tension. There should be enough tension to
insure a good returning snap when spring (B, Fig. 18A)
is depressed and released. The check spring tension
is adjusted from about 1 to 1 1/ 4 ounces when measured
with a postal scale (C, Fig. 18A). This is measured
when the check spring is 1/ 32 to 1/ 16 inch from its stop. C
The · tension post set screw should be drawn up snugly
but not forcefully tightened (B, Fig. 17). The tension
release pin should move freely in the tension post
(D, Fig. 17). The check spring eyelet (A, Fig. 18),
located just below the tension discs, should be set for
correct height as follows:
With a thread running from the tension post to the
thread wire in a straight line, the check spring eyelet
should be set 1/ 16 to l / 8 inch below the thread line
(Fig. 18). Be surethe eyelet is setclosetothetension ----- - -------
discs so that the check spring will pass freely over it
without obstruction. After making this setting, proceed
to thread machine as per threading diagram (Fig. 2).
Fig. 18A
Fig. 18B
Class 63400, and as a result,
Sew slowly on a p ie ce of mate rial and obs er ve
the action of the check spri ng . Th e thr e ad from
the check spring to the tak e -up w ire sho u ld be
taut when the take-up is at the botto m of i ts
stroke. Slight chan g es in n ee dl e t hr ead ten si on
may be necessar y at th is point, but a re as on a ble
tension should be used to mainta in a un ifo rm a nd
consistent stitch. The mach in es are sewn off
with 3 to 4 ounc es needle thread te ns i onon 70-2
cord or simil ar th r ead usin g a po stal scale
(A, Fig. 18B). Depr es s ch eck sp rin g when
checking the ten s ion. The ch e ck s pri ng will fe el
heavy to you wh en compa re d to Cl ass 61400
adjustment, but t his is a requ i red se tt ing for th e
the disc tension can be reduc e d.
17

From the library of: Superior Sewing Machine & Supply LLC
INSTRUCTIONS FOR MECHANICS (Continued)
BOTTOM COVER
Before removing the bottom cover, place the machine on bench so that the plug screw is
accessible from underneath. Remove this plug screw and catch the reservoir oil in some convenient
clean container. Tipthemachineback, loosenandremovethetwocoverscrews. The cover should
be tapped free with a wooden block or mallet. Do not pry cover loose with any sharp instrument
as the gasket may become damaged.
CAUTION! When the bottom cover is removed, care should be taken not to mar or scratch
the gasket seat area of the machine bottom.
Before replacing the cov e r, the machine gasket seat should be wiped clean and free of all lint
and dirt. The cover gasket should also be inspected for damage and cleaned of dirt. Two additional
gaskets are used to seal the boltsandmust be cleaned before assembly. Carefullysetthecover in
place and tighten the two bolts securely.
To replace a damaged cover gasket, proceed as follows:
1. Clean cover gasket recess of any foreign matt e r.
2. The gasket in cross section is triangular in shape wi th a groove in the top or widest part. With
the cover resting as it does in the machine, oil di stributing plate to your right, begin insert i ng
the gasket in the middle of the back recess. The grooved wide edge of the gasket should be up
and the long sloped edge inward. Continue pressing the gasket into the cover recess until
gasket is in place.
The bolt sealing gaskets may have a tendency to fall out when installing the cover, but may be
temporarily cemented in place by applying g rease to their recesses.
HOOK SHAFT
The hook shaft (A, Fig. 19) is held in pos i tion by the pinion (B) and collar (C) thrusting against
hard steel washers (D) between the long left hand bushing (E) and the short right hand bushing (F).
Should the hook shaft setting
be disturbed, the left and right
position can be determined by G A E D BcD F
measuring from the hook end of
the hook shaft to the point of a new
needle (G) and reading 35/ 64 inch
on a scale.
To reposition the hook shaft,
loosen the set screws of the pinion
and collar and establish the 35/ 64
inch dimension. Move the pinion
and thrust washer against the left
bushing, and after making certain
one of the set screws is on the
shaft FLAT, tighten both screws
securely. Liberally coat the
collar and its washer with oil and
press the collar a way from the
pinion so as to remove all end play
and tighten both set screws
securely. Fig. 19
Hook oiling is accomplished by a high speed rotary pump on the end of the hook shaft. The
quantity of oil supplied to the hook is regulated by the lon g er or shorter path the oil is required to
travel through the metering feltofmetering cup (G, Fig. 20). (Increase or decrease of 9il supply
is controlled by a dial (P, Fig. 20) with an arrow marked "INCREASE", found below the cloth
plat e ). The hook oil feed roller (A, Fig. 20) :which rests against the metering cup felt serves not
only to feed oil to the unit from the oil reservoir, but filters the oil as well.
REMOVAL OF OILING DEVICE
The following steps are necessary to remove hook oiling device:
1. Remove hook oil feed roller (A, Fig. 20).
2. Remove hook oil control finger (B).
3, Apply finger pressure to hook oil control shaft (D) to prevent loss of pump disc pivot pin (E);
using Allen wrench, loos en set screw ( C). Mov e assembly slowly to right, being careful not
to drop pivot pin located in the end of the hook oil control shaft. When pivot pin is clear of
pump disc (F). disc is free to fall.
4. Remove metering cup (G) along with oil supply felt (K) and air seal felt (J).
5. Remove cog (H) from hook oil control shaft.
18

From the library of: Superior Sewing Machine & Supply LLC
INSTRUCTIONS FOR MECHANICS (Continued)
RE-ASSEMBLY OF OILING DEVICE
Before re-assembly, the end of the hook shaft, its spiral groove and the pump
disc should be thoroughly cleaned. Remove any end play found in hook shaft and
determine that th e 35/ 64 inch dimension has been maintained (Fig. 19).
Fig. 20
The following steps are necessary to re-assemble the hook oiling device:
1. Remove and separate the air seal felt (J, Fig. 20) from oil supply felt (K).
2. Make sure small end of air seal spring (R) is located on boss of meter i ng cup
behind felt attached to cup. Position metering cup (G) and air seal spring on hook
shaft (S) with open end toward handwheel end of machine (Fig. 20).
NOTE: The hook shaft should pass through hole of felt attached to metering cup.
3. Position oil supply felt (K, Fig. 21) on hook shaft making certa in the felt's
projection extends into dovetail of metering cup.
4. Po s it i on air seal felt (J) on hook shaft.
5. Insert pump disc (F) inJo assembly tool No. 21227 BY, with stop pin on the
spring side of tool, 180 from handle. Insert disc approximately half way into
spring and center in tool (Fig. 22).
19

From the library of: Superior Sewing Machine & Supply LLC
INSTRUCTIONS FOR MECHANICS (Continued}
RE-ASSEMBLY OF OILING DEVICE (Continued}
6. Insert hook oil control shaft (D) and its bushing (L} part way into its boss which
is located directly behind the hook shaft, being careful NOT TO DROP the pump
disc pivot pin (E).
7. A clearance cut on the edge of the
metering cup, located between the
dovetail and the long horizontal slot,
has been provided for the pump disc
tool and should be facing you ( Fig. 22}.
8. With the fork of the tool in line with
the metering cup clearance cut and
centered about the hook shaft end,
press the felts to the left with the tool
until the pump disc is in contact with
the end of the hook shaft.
9. Press hook oil control shaft bushing Fig.
21
(L) to left until control shaft (D} is approximately 1/ 16 inch away from pump
disc (F}. Make sure the control shaft pivot pin (E) seats in the depression at the
center ofthe pump disc. Tighten set screw (C, Fig. 22} and withdraw assembly
tool. Be sure air seal felt (J) has seated against the pump disc.
10. Turn hook oil control shaft (D, Fig. 23) until screw hol8 (M) is accessible.
Manually rotate pump disc (F) so its stop pin (N} is 90 above screw hole.
11. Rotate metering cup so the short slot (T) is 180° from the stop pin (N). Now,
install the hook oil control finger (B) by first hanging the hooked portion of the
finger over the stop pin (N) and lowering to insert the projection at bottom left
Fig. 22
into the short slot of the metering cup. Tighten
finger(B) inplacebymeans ofscrewand washer,
making sure the hook oil control finger does not
bind or distort the metering cup.
12. Assemble the hook oil feed roller
(A, Fig. 24), and rotate the metering cup
so that the roller contacts the meterin g cup
felt at point (U, Fig. 24). Turn the oil
control adjusting shaft (P, Fig. 24) in the
incr e ase direction until projection s tops
against the stop pin (this is maximum oil
supply) and install the cog (H, Fig. 24) on
the hook oil control shaft. After meshing
the teeth, tighten the set screw securely.
13. Check for prope r contact of the hook oil feed roller and th e meterin g cup by
turningthe oil controladjusting shaftthroughits complete tr avel and observ e the
feed roller turning as the metering cup turns. With th e oil control adju st ing
shaft set at maximum, the feed roller po i nt of contact with the metering cup felt
should be at the mid-point of the slot that permits the metering cup felt to e nter
the metering cup.
NOTE: The feed roller should be in contact with the metering cup felt th r ough
its complete travel.
20