UnionSpecial 43500 Series Instruction sheet

®
F INE ST QUALITY
ST YLES
435000
43500F
43500L
CATALOG
No.
134M
Second
Edition
C 0 L U M 8 I A®
CLASS 43500
HI- S TYLED HIGH SPEED
S INGLE CURVED NEEDLE
PLAIN FEED MACHINE S
INDUSTRIAL
SEWING
MACHINES
UNION SPECIAL CORPORATION
C H ICAGO
From the library of: Superior Sewing Machine & Supply LLC

C a t a 1 o g No. 1 3 4 M
INSTRUCTIONS
FOR
ADJUSTING AND OPERATING
LIST OF PARTS
CLASS 43500
Styles
43500 D 43500 F
43500L
Second Edition
@ 1969
By
Union Special Corporation
Rights Reserved in All Countries
UNION SPECIAL CORPORATION
INDUSTRIAL SEWING MACHINES
CHICAGO
Printed in U.S. A.
2
March, 1976
From the library of: Superior Sewing Machine & Supply LLC

IDENTIFICATION OF MACHINES
Each UNION SPECIAL machine is identified by a Style number on a name plat e
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 43500 F". 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 43500 FZ".
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
43500".
APPLICATION OF CATALOG
This catalog applies specnically to the Standard Styles of machines as listed
herein. It can also be applied with discretion to some Special Styles of machines in
Class 43500. References to directions, such as right, left, front, back, etc., are
given from the operator's position while seated at the machine. Operating direction
of handwheel is away from operator.
STYLES OF MACHINES
Hi-Styled High Speed Plain Feed Single Curved Needle, Medium to Heavy Duty
machine, with Single Enclosed Reservoir for Automatic Lubrication.
43500 D For seaming canton flannel and jersey cloth gloves and similar operations
on medium to heavy weight materials. Seam specification 401-SSa-1. Stitch
range 6 to 12 per inch. Cam adjusted feed. Maximum recommended speed 6500
R.P.M.
43500 F For seaming trousers, coats, jackets, dresses and similar garments.
Seam specification 401-SSa-1. Stitch range 8 to 14 per inch. Cam adjusted
feed. Maximum recommended speed 6500 R. P.M.
43500 L For side seaming trousers, etc., with yielding section on left side of
presser foot. Seam specification 401-SSa-1. Stitch range 8 to 14 per inch.
Cam adjusted feed. Maximum recommended speed 6500 R. P. M.
OILING
CAUTION! Oil was drained from machine when shipped, so reservoir must be
filled before beginning to operate. Oil capacity of Class 43500 is six ounces. A
straight mineral oil of a Saybolt viscosity of 90 to 125 seconds at 1000 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 bulb on oil level indicator should show be-
tween 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.
The oil 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 periodically.
NEEDLE
Each UNION SPECIAL needle has both 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 blade, measur ed
in thousandths of an inch, midway between shank and eye. Coll e ctively, type and
size number represent the complete symbol which is given on the label of a ll
needles packaged and sold by Union Special.
3
From the library of: Superior Sewing Machine & Supply LLC

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Fig. 1
THREADING DIAGRAM AND OILING INSTRUCTIONS FOR CLASS 43500
Only parts involved in threading are shown in the above diagram. Thread machine
as indicated.
It will simplify the threading to follow the recommended sequence of threading
the looper first and the needle second.
No oiling is necessary other than keeping the red bulb between the lines on the
oil gauge on the front of the machine. Machine is filled with oil at the spring cap in
top cover.
A straight mineral oil of aSaybolt viscosity of 90 to 125 seconds at 100° Fah-
renheit should be used.
4
From the library of: Superior Sewing Machine & Supply LLC

NEEDLE (Continued)
Class 43500 machines use a curved blade needle. The standard recommended
needle is Type 157 GJS. Below is the description and sizes available of the recom-
mended needle.
Type No.
157 GJS
Description and Sizes
Round shank. round point. curved blade. flat tapered blade. Class
A. double groove. struck groove. long spot. government point.
chromium plated and is available in sizes 080/032. 090/036.
100/040. 110/044. 125/049.
To have needle orders promptly and accurately filled, an empty package. a
sample needle, or the type and size number should be forwarded. Use description
on label. A complete order would read: ''1.000 Needles, Type 157 GJS, Size 100/040".
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 formation •
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 highest quality needles in materials and workmanship for
more than three-quarters of a century.
G
A
CHANGING NEEDLE
Release pressure on presser foot by turn-
ing presser foot release bushing (A. Fig. 2) and
swing presser arm (B) out of position. With
needle at high position. loosen screw (C) and
withdraw needle.
To replace needle, leave needle holder at
high position and with the flat to the left. insert
the needle in the needle holder until it bottoms
against the needle thread eyelet (D). Tighten
screw (C). return presser arm (B) to position
and re-lock presser foot release bushing (A) •
PRESSER FOOT PRESSURE
Fig. 2 Sufficient presser foot 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 (E. Fig. 2) and turn adjusting screw (F). Adjusting screw has a right hand
thread. so tightening increases pressure. loosening decreases pressure. When
pressure adjusting screw (F) has been properly set. tighten lock nut (E). With
presser foot resting on throat plate. position locking nut (G) so that its under sur-
face is approximately 1/32 inch to 1/16 inch from the top surface of adjusting screw
(F). Set cap (H) against locking nut (G).
FEED ECCENTRICS
The feed eccentric used in these machines have been selected to produce ap-
proximately 10 stitches per inch on Styles 43500 F and L, while on Style 43500 D
the eccentric has been selected to produce approximately 8 stitches per inch. It
will be noted that the part number of the feed eccentric is No. 39540 B-10 on Styles
43500 F and L. while the part number of the feed eccentric is No. 39540 B-8 on
Style 43500 D. Minor numbers of the part symbol indicates approximately the
number of stitches produced when using that eccentric. Unless otherwise specified,
the machine will be shipped with above eccentric.
5
From the library of: Superior Sewing Machine & Supply LLC