Union Special PT0203 Parts Book
CATALOG NO.
31200AQ64Z6
PT0203
First Edition
STYLES
31200AQ64
ADJUSTING INSTRUCTIONS
AND ILLUSTRATED PARTS LIST
04-02-04
31200AQ64
High Speed, Feed Up The Arm, Plain Feed, Two needle, two looper, Side Wheel Cylinder Bed Machine specifi-
cally designed for Taping Shoulders and Collar Seams on Knitwear.
DESCRIPTION OF MACHINE
31200AQ64Z6
NEEDLE TYPE:
SETTING THE NEEDLES:
SETTING OF THE NEEDLE BAR:
LOOPER ADJUSTMENT:
Equipped with top tape reel and Presser Foot with folder for a precut 3/4" (19mm) tape to finish 3/8" (9.5mm).
Seam Spec. 401SSag-3. 6.4mm (16ga) needle spacing only. 4500 R.P.M. Maximum speed.
Same as 31200AQ64 except without presser foot.
128 GJS: Short, double groove, struck groove, thin ball point, spotted, tapered blade reinforcement, chro-
mium plated - sizes 070 / 027, 075 / 029, 080 / 032, 090 / 036.
Before readjusting the machine insert two new needles type 128GJS as far as they will go into the needle bar
head. The long groove must show to the operator. Tighten set screws securely.
To set the needle bar for the correct needle space in line of feed use the assembled needle guard, as the
step of the needle guard is the same as the needle space. The needles should slightly touch the needle
guard. After the setting, check that the needles are in the center of the stitch holes.
Insert the rear looper in the rear looper holder and be sure that the screw rests on the looper flat. The looper
gauge is 13/64"(5.16mm) measured from the center line of the left needle to the looper point with the looper
at the extreme left of its travel. Use of looper gauge 21225 - 13/64" is of advantage. For adjusting the looper
gauge loosen the clamp screw of the rear looper holder and move holder on the looper shaft to obtain
proper setting.
NEEDLE BAR HEIGHT:
Set the needle bar so that the tops of the needle eyes are about 5/64"(2mm) below the looper points when
the points are flush with the right side of the needles on their travel to the right. Watch that the needle bar
does not turn during this adjustment.
LOOPER TO NEEDLE SET:
After setting the needle bar to the correct height, set the loopers front to back to touch but not deflect the
needles at loop taking time
2
LOOPER AVOID MOTION:
The amount of looper avoid has been set at the factory to approximately .080"
(2.0mm). If it becomes necessary to adjust the amount of avoid it is recom-
mended as a starting point, to have the points of the decending needles
contact the lower 1/3 of the back of the looper blade.
NEEDLE GUARD:
Set the rear guard horizontally so that it barely contacts the needles when at its extreme forward position. It
should be set vertically as low as possible, yet have its guarding surface in contact with the needle until the
points of the loopers moving to the right are even with the right side of needles.
NOTE: Any time you change stitch length you must reset the guard.
After changing the looper avoid motion check the adjustment with respect to
the needle.
After setting the rear looper insert the front looper. The adjustment of both
loopers is the same.
To adjust the looper avoid motion remove cover plate No.31182N
at the rear of the machine. Loosen the nut with wrench No. 21388
(see sketch). To increase the avoid motion the connection link must
be moved downwards and to reduce it upwards. Tighten the nut
and replace the cover plate No. 31182N with the gasket.
FEED DOG SETTING:
The feed dog height is set correctly when the tips of the teeth project ±3/64"(1.2mm) above the throat plate
at its highest position. The height adjustment is made by loosening the set screws No. 22894W and turning the
eccentric stud No. 31139A. After this adjustment tighten set screw. At maximum stitch length adjust feed dog
to have equal clearance at both ends of the slots. Loosen screw on feed dog and move front to back to
obtain proper setting.
PRESSER FOOT:
STITCH LENGTH ADJUSTMENT:
The mechanism for setting the stitch length is located in the cylinder
(see sketch).
This mechanism is accessible after removing the right plug screw
No. 95375 above the handwheel. Loosen the ball screw No.
31133K. Moving downwards results in a shorter, and upwards in a
longer stitch length.
NOTE: Any time you change stitch length you must reset the guard.
The presser foot must rest flat on the throat plate and feed dog.
With the presser foot raised the stop collar on the presser bar is set correctly when the needle shank or the
needle bar head does not contact the presser foot when the needle bar is at the bottom of its stroke.
The pressure regulating screw is the knurled screw located on top of the machine arm next to the needle bar.
Set the pressure of the presser foot spring so that there is just enough pressure for proper feeding of the fabric.
3
LOOPER THREAD TAKE-UP:
The double disc take-up must be set into the middle of the cast-off
plate slot. It is located on the left side of the crank shaft and is
adjustable with two set screws (see sketch). The looper thread cam
should be set so that the looper thread casts off the high lobe of
THREAD GUIDES OF THE CAST-OFF PLATE:
the cam as the point of the needle is 1/64" below the under side of
the looper as the looper moves to the left.
On the right and left side of the double disc take-up on the cast-off
plate there are adjustable thread eyelets. These eyelets must be set
as close as possible to the double disc take-up. Adjusting these
eyelets toward the operator results in more looper thread in the
system, and when moving them in the opposite direction less
looper thread will be drawn.
The looper thread retainer No. 31104 is adjustably mounted on the cast-off plate support. It should be set
laterally so that it is midway between the two discs of the take-up. The height of the retainer affects the
control of the looper thread as the looper moves to the right. More looper thread is given to the stitch when
the retainer is raised. However, if the retainer is raised too high, the looper thread may be wiped under the
looper blade causing triangle skips or pulled down stitches. This can be checked by observing the action of
the looper thread as the looper moves to the right.
NEEDLE THREAD CONTROL:
The frame eyelet No. G52758 located on the left side of the needle lever stud can be adjusted to get the
required amount of needle thread. Raising the left side of the frame eyelet puts less thread in the stitch.
Needle thread strike off should be set flush with bottom of thread holes in needle thread eyelet when needles
are at bottom of stroke.
THREAD TENSION:
The tension of the needle threads and looper threads should be sufficient to produce uniform stitches.
LOOPER THREAD RETAINING FINGER:
4
5
6
Ref.
No.
Part No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
719
34354
31194A
87U
43443Q
666-214
31194B
80262I
31154
31155
31194
51294Z
21212
53394Q
666-201
666-209
22729B
22729AB
21657X
31142C
999-1
999-35
31190B
31140A
31140
999-36
31140B
31291
15430L
22569B
660-202
31121A
22894G
31175C
G56375
22581
61321J
61321L
22574
Description
Screw ................................................................................................................
Needle Bar Bushing, Upper ..............................................................................
Oil Tube Clamp .................................................................................................................
Screw ................................................................................................................
Nut ......................................................................................................................................
Felt Lint Filter .......................................................................................................................
Felt ....................................................................................................................
Bushing For Presser Guide Bar ..........................................................................................
Needle Bar Bushing, Lower ..............................................................................
Bushing For Presser Bar ......................................................................................
Oil Siphon Tube .................................................................................................
Oil Tube Connection ........................................................................................
Oil Siphon Connection Locking Ring ...............................................................
Oil siphon Assembly ..........................................................................................
Felt Plug ......................................................................................................
Siphon Cup Disc, Felt .................................................................................
Screw .........................................................................................................
Screw ................................................................................................................
Bushing .............................................................................................................
Bushing .............................................................................................................
Gasket ..............................................................................................................
Gasket ..............................................................................................................
Crankshaft Bushing ..........................................................................................
Bushing For Looper Bar .....................................................................................
Bushing For Looper Bar .....................................................................................
Gasket ..............................................................................................................
Bushing For Looper Bar .....................................................................................
Crankshaft Bushing Housing, Including Bushing ..............................................
Felt ....................................................................................................................
Screw ................................................................................................................
"O"Ring ..............................................................................................................
Pulley ................................................................................................................
Screw ................................................................................................................
Cloth Guard ......................................................................................................
Belt Guard ........................................................................................................
Screw ................................................................................................................
Handwheel .......................................................................................................
Washer ..............................................................................................................
Screw ................................................................................................................
Amt.
Req.
2
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
4
1
1
2
1
1
2
1
1
3
7
8
Ref.
No.
Part No.
1
2
-
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
31184A
95375
- - - - -
31284B
31282G
22839C
22652E14
35876U
33784B
31284F
90
31284C
22541B
31282D
39582L
52882AC
50-789
52882AA
90
31158B
95
22768
31158A
31284E
31270
22565
31282E
52782C
22569
57WD
57WC
G57WB
43296
605
31117
33758D
22768
Description
Gasket ..............................................................................................................
Plug Screw ........................................................................................................
Adaptor for 95375 .............................................................................................
Gasket ..............................................................................................................
Cover ................................................................................................................
Screw ................................................................................................................
Screw ................................................................................................................
Washer ..............................................................................................................
Gasket ...............................................................................................................................
Baffle Plate ........................................................................................................................
Screw .................................................................................................................................
Gasket ..............................................................................................................
Screw ................................................................................................................
Chamber Cover ...............................................................................................
Oil Cap ..............................................................................................................
Oil Cap Torsion Spring .......................................................................................
Oil Cap Hinge Pin ..............................................................................................
Drip Plate ..........................................................................................................
Screw ................................................................................................................
Needle Thread Leading Wire ...........................................................................
Screw ................................................................................................................
Screw ................................................................................................................
Needle Bar Thread Eyelet ................................................................................
Gasket ..............................................................................................................
Pull-off Wire .......................................................................................................
Screw ................................................................................................................
Head Cover ......................................................................................................
Screw ................................................................................................................
Screw ................................................................................................................
Nipper Spring Screw .........................................................................................
Nipper Spring ....................................................................................................
Nipper Spring Plate ...........................................................................................
Needle Thread Nipper Bore .............................................................................
Screw ................................................................................................................
Needle Bar ........................................................................................................
Needle Lever Thread Eyelet .............................................................................
Screw ................................................................................................................
Amt.
Req.
1
1
1
1
1
4
4
4
1
1
2
1
3
1
1
1
1
1
2
1
1
1
1
1
1
1
1
2
3
1
1
1
1
1
1
1
1
9
10
Ref.
No.
Part No.
Description
Amt.
Req.
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
22585A
22889H
31295
22585A
G52758
22848
20
99287
99287B
31182
99287C
31279F
31258E
77K
31263
77L
31184R
31182B
31258D
94
31182K3
31182SK4
33784
96402
22524
31182C
31262B
G50-434
41394A
99242
22733B
31284D
22585A
40C149
22652E24
Screw ................................................................................................................
Screw ................................................................................................................
Needle Lever Eyelet Guard .............................................................................
Screw ................................................................................................................
Thread Eyelet ...................................................................................................
Screw ................................................................................................................
Washer .............................................................................................................
Screw ................................................................................................................
Screw ................................................................................................................
Cylinder Cover .................................................................................................
Screw ................................................................................................................
Cylinder End Cover ..........................................................................................
Thread Eyelet, Front .........................................................................................
Screw ................................................................................................................
Latch Spring .....................................................................................................
Screw .................................................................................................................................
Gasket ..............................................................................................................
Support For Cylinder Cover, Front ...................................................................
Thread Eyelet, Rear ..........................................................................................
Screw ................................................................................................................
Holding-plate ...................................................................................................
Splash-leather ..................................................................................................
Gasket ..............................................................................................................
Rivet ..................................................................................................................
Screw ................................................................................................................
Support for Cylinder Cover, Rear ....................................................................
Baffle Plate .......................................................................................................
Lucite Oil Gauge ..............................................................................................
Gasket ...............................................................................................................................
Screw .................................................................................................................................
Oil Drain Screw ..................................................................................................................
Gasket ..............................................................................................................
Screw ................................................................................................................
Washer .............................................................................................................
Screw ................................................................................................................
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
2
1
1
1
1
1
2
1
1
3
4
4
11
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