39500AD - Sewing machine Union Special - Free user manual and instructions

Product Type	Industrial Chainstitch Sewing Machine
Brand	Union Special
Model	39500AD
Dimensions (approx.)	450 mm x 300 mm x 400 mm
Weight (approx.)	25 kg
Power Supply	110-240 V, 50/60 Hz, 0.5 kW
Stitch Type	Single needle chainstitch
Max Sewing Speed	2500 stitches per minute
Needle System	135×17 or equivalent
Lubrication	Automatic oiling system
Foot Lift	Pneumatic
Thread Trimmer	Optional automatic
Primary Functions	Bag closing, heavy duty sewing
Maintenance	Regular cleaning and oiling as per manual
Safety Features	Finger guard, emergency stop button
Spare Parts Availability	Through authorized dealers
Reparability	Modular design for easy repair
Documentation	User manual available in PDF (16 pages)

Frequently Asked Questions - 39500AD Union Special

How to thread the Union Special 39500AD?

Refer to the threading diagram in the manual. Ensure the machine is off. Pass the thread through the top tension discs, take-up lever, and needle eye. For chainstitch, also thread the looper.

What needle size should I use?

Use needle system 135×17. Typical sizes range from #16 to #22 depending on fabric thickness. Consult the manual for recommendations.

How to adjust thread tension?

Turn the tension dial clockwise to increase tension, counterclockwise to decrease. Test on a scrap piece. Proper tension forms a balanced chainstitch.

How often should I clean the machine?

Clean daily after heavy use. Remove lint and dust from the feed dogs, needle plate, and hook area. Use a soft brush and compressed air.

What type of oil is recommended?

Use sewing machine oil specifically for industrial machines. Apply a few drops to designated oiling points as shown in the manual.

How to replace the needle?

Turn off the machine. Loosen the needle clamp screw, remove the old needle, insert new needle with the flat side facing the back, and tighten securely.

Why is the machine skipping stitches?

Possible causes: blunt or wrong needle, incorrect tension, or misaligned timing. Check needle, rethread, and consult the manual for timing adjustment.

How to adjust stitch length?

Locate the stitch length regulator lever or dial. Turn to desired length (e.g., 3-5 mm for bags). Test and adjust as needed.

What is the maximum material thickness?

The 39500AD can sew through multiple layers of heavy fabric up to approximately 10 mm total thickness, depending on needle and thread.

Where can I download the user manual?

The manual is available for free on notice-facile.com in PDF format. Search for Union Special 39500AD.

USER MANUAL 39500AD Union Special

Pure diagram of a U-shaped object with internal curved lines, no text or symbols present

FINEST QUALITY

FILE

UnionSpecial®

LEWIS • COLUMBIA

INDUSTRIAL

SEWING

MACHINES

STYLE 39500AD

Union Special

CLASS 39500

CATALOG

No.

103AD

STREAMLINED

Catalog No. 103 AD (Supplement to Catalog No. 103 U)

INSTRUCTIONS

FOR

ADJUSTING AND OPERATING

LIST OF PARTS

CLASS 39500

Style 39500 AD

First Edition

Copyright 1960 by Union Special Machine Co. Rights Reserved in All Countries

UnionSpecial

MACHINE COMPANY

INDUSTRIAL SEWING MACHINES

CHICAGO

Printed in U.S.A.

April, 1973

IDENTIFICATION OF MACHINE

Each Union Special machine is identified by a Style number which is stamped into the name plate.

Machines similar in construction are grouped by a Class number, which contains no letters. Example: "39500". Letters suffixed to a Class number indicates the standard Style of a machine. Example: "39500 AD". Letter "Z" is reserved as a suffix to the standard Style identification to specify machine is of "Special" construction.

APPLICATION OF CATALOG

This catalog is a supplement to Catalog No. 103 U and should be used in conjunction. Parts illustrated in this catalog represent parts not used in 39500 S, T, or U machines. For clarity, certain 39500 S, T, and U parts are shown in phantom to help locate 39500 AD parts.

Opposite the illustration page, parts are identified by detail number, part number, description, and amount required.

Adjusting and operating instructions included represent only areas concerned with 39500 AD.

This catalog applies specifically to the standard Style of machine as listed herein and can also be applied with discretion, to some Special machines of Class 39500. References to direction, such as right, left, front, back, etc., are taken from the operator's position while seated at the machine. Operating direction of handwheel is away from operator.

STYLE OF MACHINE

Two Needle, Two Looper, Four Thread, Overseaming Machine. Intermittent Differential Feed, Trimming Mechanism with Spring Pressed Lower Knife, Automatic Lubricating System.

39500 AD For seaming and intermittently gathering operations on pajamas, bathing suits, house dresses, children's wear, ladies' undergarments and similar articles. Knee press controlled intermittent differential feed and independent swing-out auxiliary pressure plate attachment. Three thread overedge and reinforcing stitch - seam specification 512-SSa-1. Standard width of seam from left needle 17/64 inch. Gathering ratio up to 3 to 1 depending on stitch length. Stitch range 8 to 20 per inch, standard setting 14 per inch.

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 ounces. 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 bulb on oil level indicator should show between gauge lines.

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 periodically.

NEEDLES

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, measured in thousandths of an inch, midway between shank and eye. Collectively, type and size number represent the complete symbol which is given on the label of all needles packaged and sold by Union Special.

NEEDLES (Continued)

Style 39500 AD uses curved blade needles. 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 description on label. A complete order would read: "1000 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 formation.

Success in the operation of Union Special machines can be secured only by use of needles packaged under our brand name, UnionSpecial which is backed by a reputation for producing highest 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 bushing (S, Fig. 1) and swing presser arm (H) out of position. Turn handwheel in operating direction until needles are at their lowest point of travel. Using hexagonal socket wrench No. 21388 AU, furnished with machine, loosen needle clamp nut about 1/4 turn. Again turn handwheel until needles are at their high position; withdraw needles.

To replace needles, leave needle holder at high position and, with the flats to the left, insert needles in holder, one on each side of spacer washer, until they rest against stop pin. Keeping needles in this position, turn handwheel until holder is again at its low point of travel; then tighten nut. Return presser arm (H) to position; re-lock presser foot release bushing (S).

THREAD STAND

After threads come from cones on thread stand (Z, Fig. 1), they are brought up through back eyelets, then down through front eyelets (Y) and through the adjustable thread guide. Next, they are threaded through each pair of holes in tension thread guide wire (A), down through right hand hole and up through left hand hole. Then thread continues between tension discs (U), through slot (T), and on through thread guide (B).

THREADING

Only parts involved in threading are shown in threading diagram (Fig. 1). Parts are placed in their relative positions for clarity.

It will simplify threading this machine to follow recommended sequence of threading lower looper first, upper looper second, and needles third.

Before beginning to thread, swing cloth plate open, turn handwheel in operating direction until needles (L) are at high position, release pressure on presser foot by turning presser foot release bushing (S); and swing presser arm (H) out of position.

Be sure threads, as they come from the tension thread guide, are between tension discs (U) and in diagonal slots (T) in tension posts (V).

X Tension Nut W Tension Spring V Tension Post U Tension Discs T Tension Post Slot Y Thread Eyelet To Upper Looper To Left Needle To Lower Looper Z Thread Stand S Presser Foot Release Bushing A Tension Thread Guide Wire B Thread Guide C Upper Looper Thread Eyelet D Auxiliary Looper Thread Eyelet E Lower Looper Thread Eyelet F Fabric Guard Bracket G Frame Looper Thread Guide H Presser Arm Figure 1 R Looper Thread Pull-off Q Needle Thread Cam Pull-off P Needle Thread Eyelet N Top Cover Needle Thread Eyelet M Upper Looper Thread Tube Assembly L Needles K Upper Looper J Lower Looper

TO THREAD LOWER LOOPER

Double end of thread and lead it through both eyes of lower looper thread eyelet (E, Fig. 1) from right to left. Note: thread must pass in front of looper thread pull-off (R). Lead thread behind fabric guard (F) and through frame looper thread guide (G). Turn handwheel in operating direction until heel of lower looper (J) 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 (K) 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 (R). 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 needles (L, Fig. 1) are at their highest position. Insert both needle threads from right to left, through both eyes of needle thread eyelet (P), under neck of top cover casting; then down through hole in top cover needle thread eyelet (N). Thread needles from front.

THREAD TENSION

The amount of tension on needle and looper threads is regulated by four knurled tension nuts (X, 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).

A B C D

Fig. 2

FEED ECCENTRICS

Feed eccentricities used in this machine have been selected to produce approximately 10 stitches per inch. It will be noted that the part numbers of feed eccentricities are No. 39540-10 for the differential feed and No. 39540-12 for the main feed. Minor numbers of the part symbols indicate approximately the number of stitches when using that eccentricity. Unless otherwise specified, machine will be shipped with above combination of eccentricities.

FEED ECCENTRICS (Continued)

Following stitch number feed eccentricis 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 eccentricis may be ordered separately. To order an eccentric, use No. 39540 with a minor number suffixed to indicate number of stitches desired. Example: "39540-12".

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:

SETTING THE NEEDLE

With the throat plate in position, needles should center in the front end of needle slots. When needles are at high position, needle points should be set 15/32 inch above throat plate (Fig. 3). Move needle driving arm (A, Fig. 3), by loosening clamp screw (B). Remove the throat plate.

A B 15 32

Fig. 3

If needle thread cam pull-off (A, Fig. 4) overlaps looper thread pull-off (B), separate by moving looper thread pull-off to back. When re-tightening looper pull-off screw, be sure to take up end play in needle driving arm.

A B T

Fig. 4

A C B D

Fig. 5

At this point, insert lower looper (A, Fig. 6) into bar (B). With the lower looper at the left end of its stroke, set point 1/16 inch from center of left needle (Fig. 6), using looper gauge No. 21225-1/16.

A C B

Fig. 6

SETTING THE REAR NEEDLE GUARD

Set rear needle guard (A, Fig. 5) as high as possible, without interfering with either lower looper or movement of lower knife holder, but still in position to deflect needles forward .002-.004 inch. Screw (B) is used to set rear needle guard. Make sure there is no interference between rear needle guard and lower looper.

SETTING THE LOWER LOOPER

Now, finish lower looper adjustment. As lower looper moves to the right, its point should be set into the scarf of the left needle (A, Fig. 7) until the needles spring forward from rear guard surface another .002-.004 inch.

SETTING THE FRONT NEEDLE GUARD

Assemble front needle guard (C, Fig. 5). When lower looper is springing needles off back guard, set front needle guard as closely as possible to needles without touching. Use screw (D) to adjust and set front needle guard. After setting, make sure there is no interference between needle guards and differential feed dog.

Black-and-white photo of a mechanical device with labeled component 'A' (no readable text or symbols beyond label)

Fig. 7

SETTING THE UPPER LOOPER

16 3 3/2 B A

Fig. 8

Insert upper looper (A, Fig. 8) in its holder. Screw (B) 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 already in place. Screw (C) on clamp holds the upper looper holder in the shaft. Locate upper looper in its holder so that the shank extends 1/16 to 3/32 inch beyond holder.

When the upper looper is at the right end of its stroke, upper looper holder should be set to position upper looper shank back of vertical (Fig. 8).

.002" CLEARANCE

Fig. 9

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 the handwheel until upper looper is at the left end of its travel. Check dimensions of upper looper point with respect to the right 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.

Black-and-white photo of a mechanical device with numbered components and labeled parts A and B

Fig. 10

Dimension 17/32 inch is increased by turning upper looper holder counterclockwise looking from left end of machine. Dimension 1/8 inch is increased by pulling upper looper holder left, out of the upper looper shaft. After these changes are made, it may be necessary to turn the upper looper around its shank slightly to maintain the condition shown in Fig. 9.

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 counter-clockwise, looking from left end of machine. Reset to maintain dimensions of Fig. 9, 10, 11.

NOTE POSITION

Fig. 11

SETTING THE FEED DOGS

A B C

Fig. 12

Assemble the main and differential feed dogs (A, B, Fig. 12). Main and differential feed dogs should be leveled 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 the teeth first appear above the throat 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 and differential feed dogs (A, B) should be 3/64 inch above the throat plate. The chaining feed dog is made as on integral part of the main feed dog.

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 support 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

Technical diagram with labeled components and directional arrows, likely from an engineering or mechanical context

Fig. 13

Replace upper knife assembly. Clamp upper knife (D, Fig. 13) in position, setting nut (E) to hold clamp (F) in its most clockwise position against upper knife. Upper knife chain guard (J) should be positioned so that the guarding section is approximately 1/64 inch behind the cutting edge and in contact with the top surface of the upper knife.

SETTING THE UPPER KNIFE (Continued)

At the bottom of its stroke, front cutting edge of upper knife should extend not less than 1/64 inch below cutting edge of lower knife.

After upper knife has been set for proper width of trim, screw(G) must be tightened to lock the upper knife holding block(H) in place. This will simplify resetting when upper knife is replaced.

SETTING THE DIFFERENTIAL RATIO

Differential, plain, or reverse differential feed action is obtainable thru use of the micrometer adjusting screw (Fig. 14).

The position of the differential control lever (A) is governed by two settings--the top stop (B) and the lower stop screw (C). Amount of movement by lever between (B) and (C) determines feed action.

Rotation of adjusting thumbscrew (located near tension post assembly) clockwise (moving top stop down) increases differential action. A counterclockwise turn acts the reverse.

A B C D

Fig. 14

The micrometer adjusting screw for the top stop is ideal for continuous shirring operations where various sizes are encountered.

For intermittent operations, it may be advantageous to reverse the stops--so the adjusting screw stop(B) is for lower stop, and the stationary stop(C) is for upper position.

The 3 to 1 ratio machines are equipped with a stop screw (D) to prevent differential feed dogs from striking the throat plate when a machine is set at maximum differential, and screw should not be removed.

STARTING TO OPERATE

Be sure machine is threaded according to threading diagram (Fig. 1, Page 5). With thread tensions light, set looper thread eyelets (C and E) about horizontal and in the 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 (P, Fig. 1) so that needle cam pull-off (Q) just contacts 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 (R) reaches its most rearward position. Looper thread pull-off (R) is set about 1/8 inch distance behind needle thread cam pull-off (Q). Frame looper thread guide (G) should be set with its eyelet approximately 1/8 inch to right of lower looper (J) 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

Before proceeding to adjust upper looper thread eyelet (C, Fig. 1), balance all four 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 (R) 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 and 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 (R), 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 material being sewn. In general, lower looper thread tension should be set as high as possible 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.

The parts illustrated on the preceding page and described on this page represent the parts that are used on Style 39500 AD, but are not used on Styles 39500 S, T or U.

Those parts shown in phantom views and bearing no reference numbers are common to Styles 39500 AD and 39500 S, T and U.

Use Catalog No. 103 U for all parts not illustrated or described here.

Ref. No.	Part No.	Description	Amt. Req.
1	108	Tension Post Nut	4
2	51292 F-4	Tension Spring, looper thread	2
	51292 F-8	Tension Spring, needle thread	2
3	107	Tension Post Ferrule	4
4	109	Tension Disc	8
5	35792 H	Tension Post	4
6	39592 G	Tension Post Mounting Bracket	1
7	39563 V	Frame Thread Guide	1
8	39582 T	Top Cover	1
9	39582 L	Oil Filler Cover	1
10	51-103 Blk.	Hinge Pin	1
11	39582 V	Spring	1
12	39563 W	Top Cover Needle Thread Eyelet	1
14	39551 C	Needle Clamp Stud	1
15	39552 F	Needle Driving Arm	1
16	51-45 Blk.	Stop Pin	1
17	22596 E	Screw, Allen Head	1
18	39551 D	Needle Spacer Washer	1
19	14077	Nut	1
20		Needles	2
21	39524 W	Throat Plate, marked "AN"	1
22	39525 N	Needle Guard, rear	1
23	39525 F	Needle Guard, front	1
24	605 A	Screw	2
25	39556 H	Presser Foot Hold Down Plate	1
26	22704	Screw	1
27	39556 K	Chain Cutting Knife	1
28	39520 AD	Presser Foot	1
29	39597 AD	Stitch Tongue, marked "EL"	1
30	39530	Hinge Spring	1
31	22768 B	Screw	1
32	39526 AD	Differential Feed Dog, marked "AJ"	1
33	39505 AD	Main Feed Dog, marked "AH"	1
34	8372 A	Washer	2
35	25 CC	Screw	1
36	22728 A	Screw	1
37	39536 AC	Feed Control Adjustable Stop	1
38	39536 AA	Feed Control Mounting Bracket	1
39	39536 AD	Spring Washer	1
40	161	Stop Collar	1
41	88	Screw	1
42	39536 AB	Feed Control Adjusting Rod	1
43	161 A	Stop Collar	1
44	22764	Screw	1
45	43139 A	Nut	2
46	22569 C	Screw	2

Technical diagram of mechanical assembly with numbered components and labeled parts

THREAD STAND AND KNEE PRESS ASSEMBLY

Ref.No.	PartNo.	Description	AmRed
1	21101 H-4	Thread Stand, complete	1
2	21114 H-4	Eyelet Support	1
3	22652 CD-4	Screw	2
4	21114 M	Eyelet Locking Ring	8
5	21114 L	Eyelet	8
6	21104 V	Felt Pad	4
7	21114 W	Spool Pin	4
8	258 A	Nut	8
9	21114	Spool Seat Disc	4
10	652-16	Washer	4
11	21114 S-4	Lead Eyelet	1
12	21114 M	Eyelet Locking Ring	4
13	21114 L	Eyelet	4
14	21114 D-4	Spool Seat Support	1
15	22651 CD-5	Screw	2
16	21114 T	Lead Eyelet Socket Ball	1
17	22651 CD-4	Screw	2
18	22810	Screw	1
19	21114 A	Thread Stand Base	1
20	22651 CD-5	Screw	2
21	21114 U	Lead Eyelet Ball Split Socket	2
22	652-16	Washer	1
23	21104 H	Nut	1
24	21104 B-20	Thread Stand Rod	1
KNEE PRESS PARTS
25	660-168	Knee Press Pad	1
26	21664	Knee Press Plate	1
26A	69 FD	Screw	1
27	21663 C	Knee Press Plate Rod	1
28	21665	Knee Press Rod Connection	1
29	69 FD	Screw	2
30	21662	Knee Press Bracket	1
31	SC330	Screw	2
32	21664 B	Knee Press Bracket Shaft	1
33	9271	Collar	2
34	98	Screw	2
35	21664 E	Connection Rod	1
36	22557 A	Screw	1
37	43137 E	Washer	1
38	39536 AD	Spring Washer	1
39	21664 C	Bell Crank Bracket	1
40	SC303	Screw	2
41	421 D-10	Treadle Chain	1
42	21664 D	Bell Crank	1

Here are Oil Specifications for Union Special Sewing Machines

Specification 174 specifies a high quality petroleum oil, viscosity 100 seconds at 100^ . Recommended for all oiling applications on high speed machines.

Specification 175 specifies a high quality petroleum oil, viscosity 100 seconds at 100^ , water white or with a maximum A.S.T.M. color number of 1. For use where freedom from oil staining is paramount.

Specification 87 specifies a high quality petroleum oil, viscosity 300 seconds at 100°F.

Specification 100 specifies a general purpose high quality grease for use in ball bearings and transmitters. It is similar to commercial N.L.G.I., grease No. 3. Where No. 3 grease is not obtainable, No. 2 may be used.

UNION SPECIAL

SPECIFICATION NO.	174	175	87
Viscosity S.S.U. at 100°F	90-125	90-125	300-350
Flash (Min.)	350	350	350
Pour (Max.)	20	20	20
Color A.S.T.M. (Max.)	3	1	3
Neutralization No. (Max.)	0.10	0.10	0.10
Viscosity Index(D & D Min.)	85	85	85
Compounding	None	None	None
Copper Corrosion (Max.)	1A	1A	1A
*Anline No.	175-225	175-225	175-225

*Used with Buna N Rubber "O" Retainers

Black-and-white portrait of a smiling woman standing outdoors (no visible text or symbols)

NOTE 1: The use of non-corrosive additives in oils meeting above classification is desirable but not essential. These may include:

1. Oxidation inhibitors
2. Rust inhibitors
3. Lubricity additives
4. Anti-oxidants
5. Film strength additives

These additives must be completely soluble in the oil and not removable by wick feeding nor shall they separate.

NOTE 2: Oils containing the following type additives shall not be used at any time:

1. Extreme pressure additives—corrosive
2. Tackiness or adhesive additives
3. Lead soap additives
4. Detergents

UnionSpecial®

FINEST QUALITY MACHINE COMPANY

DEPENDABLE SERVICE WORLD'S FINEST QUALITY * SINCE 1881

UnionSpecial® INDUSTRIAL SEWING MACHINES

UNION SPECIAL maintains sales and service facilities throughout the world. These offices will aid you in the selection of the right sewing equipment for your particular operation. Union Special representatives and service men are factory trained and are able to serve your needs promptly and efficiently. Whatever your location, there is a Union Special Representative to serve you. Check with him today.

ATLANTA, GA.

MONTREAL, CANADA

BOSTON, MASS.

TORONTO, CANADA

CHICAGO, ILL.

BRUSSELS, BELGIUM

DALLAS, TEXAS

LEICESTER, ENGLAND

LOS ANGELES, CAL.

LONDON, ENGLAND

NEW YORK, N. Y.

PARIS, FRANCE

PHILADELPHIA, PA.

STUTTGART, GERMANY

Representatives and distributors in all important industrial cities throughout the world.

UnionSpecial

MACHINE COMPANY

400 N. FRANKLIN ST., CHICAGO, ILL. 60610