Union Special 35800 Parts List

Feed-off-the arm, 3-Needle, Double Chainstitch Machine

35800 Series

ENGINEER’S MANUAL

40052737

No.E376-00

Introduction

This Engineer’s Manual is written for the technical personnel who are responsible for the service and maintenance of the machine. The maintenance services to be done on this sewing machine should be based on this manual. This manual gives the "Standard Adjustment" on the former section under which the most basic adjustment value is described and on the latter section the "Results of Improper Adjustment" under which stitching errors and troubles arising from mechanical failures and "How To Adjust" are described.

1. Specifications ........................................................................................................ 1

(1) Roller mechanism/clutch type............................................................................................... 1

(2) Roller mechanism/belt type ...................................................................................................2

2. Model list ................................................................................................................ 3

(1) Model list using the roller mechanism of the clutch type................................................... 3

(2) Model list using the roller mechanism of the belt type....................................................... 3

3. Description of US model code.................................................................... 5

4. Description of model code .......................................................................... 6

5. Names of machine head .............................................................................. 7

6. How to pass the threads.............................................................................. 8

(1) Differential feed....................................................................................................................... 8

(2) 1 piece feed ............................................................................................................................. 9

7. Standard adjustment ............................................................................................10

(1) How to remove the gauge components and upper feed roller......................................... 10

(differential feed mechanism and 1 piece feed mechanism)

(2) Timing between the looper and needle bar........................................................................ 12

(3) Adjustment of the needle entry positions in the right-left and front-rear directions ..... 14

(4) Looper adjustment ............................................................................................................... 16

1) Looper return .....................................................................................................................................16

2) Adjustment of the clearance between the looper and needle ............................................................16

(5) Adjustment of the needle bar height .................................................................................. 18

(6) Adjustment of the looper motion paths.............................................................................. 20

(7) Adjustment of rear needle guide......................................................................................... 22

1) Longitudinal adjustment of the rear needle guide ..............................................................................22

2) Height adjustment of rear needle guide .............................................................................................22

(8) Adjustment of feed dog height and longitudinal movement

(differential feed dog mechanism) ...................................................................................... 24

1) Height of main feed dog.....................................................................................................................24

2) Height of differential feed dog ............................................................................................................24

3) Adjustment of longitudinal movement of main feed dog ....................................................................24

4) Adjsutment of vertical height of main feed dog and differential feed dog ..........................................24

5) Gradient of main feed dog and differential feed dog......................................................................... 24

(9) Adjustment of feed dog height and longitudinal movement

(1 piece feed dog mechanism) ............................................................................................ 26

1) Height of main feed dog.....................................................................................................................26

2) Adjustment of longitudinal movement of main feed dog ....................................................................26

(10)Adjustment of feed mechanisms ........................................................................................ 28

1) Adjustment of stitch length.................................................................................................................28

2) Adjustment of differential feed amount ..............................................................................................28

(11)Presser adjustment .............................................................................................................. 30

1) Adjustment of amount of rise of presser ............................................................................................30

2) Adjustment of presser bar pressure...................................................................................................30

(12)Adjustment of upper feed roller .......................................................................................... 32

(13)Replacement of upper feed roller........................................................................................ 34

(14)Adjustment of drawing amount of upper feed roller ......................................................... 36

(15)Adjustment of needle thread path....................................................................................... 38

1) Height of needle thread adjusting path ..............................................................................................38

2) Height of rocking take-up path ...........................................................................................................38

3) Height of needle thread guide adjuster ..............................................................................................38

(16) Adjustment of bobbin thread cam...................................................................................... 40

(17) Adjustment of tension disk rise.......................................................................................... 42

(18) Adjustment of air nozzle (air blow)..................................................................................... 44

(19) Adjustment of folder ............................................................................................................ 46

8. Lubrication ........................................................................................................... 48

9. Folder types .........................................................................................................

10. Maintenance ........................................................................................................ 50

(1) Spare parts ............................................................................................................................. 50

11. Part numbers and names of the modification parts for the

35800 Class – B8/B9 soft chain stitches (balloon stitches)............................ 52

Troubles and corrective measures........................................................... 53

12.

1. Specifications

(1) Roller mechanism/clutch type

No. Specifications

Item 1 Stitch type 3-needle, 6-thread, double chainstitch machine (401 LSc-3) 2 Application Denim, working clothes, felt, etc. 3 Max. sewing speed 4500 rpm 4 Sewing speed 3500 rpm

5 Needle gauge

6 Stitch length 2.1 to 3.6 mm (standard: 3.2 mm) at 1-inch intervals

7 Needle (standard size)

8 Needle bar stroke 33mm 9 Number of threads 6 pcs.

10 External dimensions H : 420 x W : 285 x D : 345 mm 11 Machine head weight 23.5 kg 12 Lifting amount of presser 9mm 10mm 13 Feed roller width 11.9mm 14.9mm

14 Feed roller shape

15 Feed adjustment

16 Lubrication Automatic rotary pump lubrication system

17 Lubricating oil

18 Oil tank capacity

19 Installation

Working temperature/

20 Temperature: 5 - 35°C, humidity: 35 - 85% (No dew condensation permissible)

humidity ranges

Model

35800DLU9 35800DNU8/9 35800DZ32/36 35800DRU8/9 35800PZ32/36 35800DWW8/9

8 gauge: 3.2 mm, total width: 6.4 mm 9 gauge: 3.6 mm, total width: 7.2 mm

UY130GS (standard) (Caution 1)

125 (#21) 140 (#24)

Standard Inverted Standard Inverted Standard

(narrow type) (narrow type) (narrow type) (narrow type) (wide type)

Main feed: Slide type stitch pitch adjusting system

Differential feed Differential feed

lever adjusting system 1 piece feed lever adjusting

system

Union Special Spec 175 (ISO grade 22) or

JUKI OIL SUP2000-1L

Front tank capacity: 70 to 80 ml

Rear tank capacity: 60 to 70 ml

Pedestal type

Table and auxiliary drive type

Supply voltage/frequency

Rated voltage ±10%, 50/60Hz

(Caution 1) Please be aware that many customers use the needle of UY128GLS with the needle size of 125

(No. 21) in Japan and check the needle number at shipment.

– 1 –

(2) Roller mechanism/belt type

No. Specifications

Item 1 Stitch type 3-needle, 6-thread, double chainstitch machine (401 LSc-3) 2 Application Denim, working clothes, felt, etc. 3 Max. sewing speed 4500rpm 4 Sewing speed 3500rpm

5 Needle gauge 6 Stitch length 2.1 to 3.6 mm (standard: 3.2 mm) at 1-inch intervals

7 Needle (standard size)

8 Needle bar stroke 33mm 9 Number of threads 6 pcs.

10 External dimensions H : 420 x W : 285 x D : 345 mm 11 Machine head weight 23.5kg 12 Feed roller width 14.9mm

13 Feed roller shape

14 Lifting amount of presser 9mm 10mm

15 Feed adjustment

16 Lubrication Automatic rotary pump lubrication system 17 Lubricating oil

18 Oil tank capacity

19 Installation

Working temperature/

20 Temperature: 5 - 35°C, humidity: 35 - 85% (No dew condensation permissible)

humidity ranges

Model

35800BLW9 35800BQW8/9 35800BWDN8/935800BWDR8/9 35800BRWH9 35800BWW8/9

8 gauge: 3.2 mm, total width: 6.4 mm 9 gauge: 3.6 mm, total width: 7.2 mm

UY130GS (standard) (Caution 1)

125 (#21) 140 (#24)

Standard Rubber Standard

(wide type) (wide type) (wide type)

Main feed: Slide type stitch pitch adjusting system

Differential feed Differential feed lever adjusting 1 piece feed lever adjusting 1 piece feed

system system

Union Special Spec 175 (ISO grade 22) or

JUKI OIL SUP2000-1L

Front tank capacity: 70 to 80 ml Rear tank capacity: 60 to 70 ml

Pedestal type

Table and auxiliary drive type

Supply voltage/frequency

Rated voltage ±10%, 50/60Hz

(Caution 1) Please be aware that many customers use the needle of UY128GLS with the needle size of 125

(No. 21) in Japan and check the needle number at shipment.

– 2 –

2. Model list

The standard model is the feed-off-the-arm 3-needle, double chainstitch machine for double lap seam

(1) Model list using the roller mechanism of the clutch type

No. Model Application

1 35800DNU8

Double lap seam, hip overlapped seam

(Denim fabric of 10 to 14 oz.)

2 35800DNU9

3 35800DZ32

For medium-weight to heavy-weight materials

Double lap seam, hip overlapped seam

(Denim fabric of 10 to 14 oz.)

4 35800DZ36

5 35800DRU8

For medium-weight to heavy-weight materials

Double lap seam

Denim (denim fabric of 10 to 14 oz.)

6 35800DRU9

7 35800PZ32

For medium-weight to heavy-weight materials

Double lap seam

Denim (denim fabric of 10 to 14 oz.)

8 35800PZ36

9 35800DWW8

For medium-weight to heavy-weight materials

Double lap seam/high throw feed eccentric mechanism

Denim (denim fabric of 15 to 14 oz.), felt, etc.

10 35800DWW9

For heavy-weight to extra-heavy-weight materials

Needle Number of needles 3 pieces as

standard

Number of

threads

6 pieces as

standard

130GS

(140)

2-3

130GS

(140)

2-3

130GS

(140)

2-3

130GS

(140)

2-3

130GS

(140)

2-3

4-6

Needle gauge 8ga-3.2mm 9ga-3.6mm

3.2+3.2

6.4mm

3.6+3.6

7.2mm

3.2+3.2

6.4mm

3.6+3.6

7.2mm

3.2+3.2

6.4mm

3.6+3.6

7.2mm

3.2+3.2

6.4mm

3.6+3.6

7.2mm

3.2+3.2

6.4mm

3.6+3.6

7.2mm

Number of

stitches (mm)

8 stitches as

standard

2.1 to 3.6mm

(at 1-inch intervals)

7 to 12 stitches

2.1 to 3.6mm

(at 1-inch intervals)

7 to 12 stitches

2.1 to 3.6mm

(at 1-inch intervals)

7 to 12 stitches

2.1 to 3.6mm

(at 1-inch intervals)

7 to 12 stitches

2.1 to 3.6mm

(at 1-inch intervals)

7 to 12 stitches

Differential

motion

Yes

Lifting

amount

presser

9mm

10mm

Upper puller

drive

Clutch type

Roller width

11.9mm

14.9mm

Roller shape

Standard

type narrow

roller

(35875AV)

Inverted

type narrow

roller

(35875AW)

Standard

type narrow

roller

(35875AV)

Inverted

type narrow

roller

(35875AW)

Standard type wide

roller

(35826X)

Optional roller

Inverted type

narrow roller

(35875AW)

Rubber type narrow

roller (35826EF)

Standard type

narrow roller

(35875AV)

Rubber type narrow

roller (35826EF)

Inverted type

narrow roller

(35875AW)

Rubber type narrow

roller (35826EF)

Standard type

narrow roller

(35875AV)

Rubber type narrow

roller (35826EF)

Inverted type wide

roller (35826CB)

Rubber type wide

roller (35826DZ)

Presser

width

(front view)

Narrow

Wide

Unevenness

of throat

plate

2.4mm

Feed shape

(side view)

0.8 mm of

unevenness

0.8 mm of

unevenness

0.8 mm of

unevenness

Standard

type folder

23420

AY18-1/8

23420

AY18-1/8

23420

AY18-1/8

23420

AY18-1/8

23420

AY18-1/8

Sewing

speed

(rpm)

3500

Max.

sewing

speed

(rpm)

4500

(2) Model list using the roller mechanism of the belt type

No. Model Application

Double lap seam, denim (denim fabric of 6 to 9 oz.),

1 35800BLW9

2 35800BQW8

3 35800BQW9

4 35800BWDN8

5 35800BWDN9

6 35800BWDR8

7 35800BWDR9

8 35800BRWH9

9 35800BWW8

10 35800BWW9

denim (denim fabric of 6 to 9 oz.), jacket, working clothes, etc.

Double lap seam/high throw feed eccentric mechanism

working clothes, working pants, etc

For light-weight to medium-weight materials

Double lap seam,

For light-weight to medium-weight materials

Double lap seam,

denim (denim fabric of 10 to 14 oz.)

For medium-weight to heavy-weight materials

Double lap seam,

denim (denim fabric of 10 to 14 oz.)

For medium-weight to heavy-weight materials

Double lap seam,

(denim fabric of 10 to 14 oz.)

For medium-weight to heavy-weight materials

Denim (denim fabric of 15 to 14 oz.), felt, etc.

For heavy-weight to extra-heavy-weight materials

Needle Number of needles 3 pieces as

standard

Number of

threads

6 pieces as

standard

130GS

(125)

2-3

130GS

(125)

2-3

130GS

(140)

2-3

130GS

(140)

2-3

130GS

(140)

2-3

130GS

(140)

2-3

4-6

Needle gauge 8ga-3.2mm 9ga-3.6mm

3.6+3.6

7.2mm

3.2+3.2

6.4mm

3.6+3.6

7.2mm

3.2+3.2

6.4mm

3.6+3.6

7.2mm

3.2+3.2

6.4mm

3.6+3.6

7.2mm

3.6+3.6

7.2mm

3.2+3.2

6.4mm

3.6+3.6

7.2mm

Number of

stitches (mm)

8 stitches as

standard

2.1 to 3.6mm

(at 1-inch intervals)

7 to 12 stitches

2.1 to 3.6mm

(at 1-inch intervals)

7 to 12 stitches

2.1 to 3.6mm

(at 1-inch intervals)

7 to 12 stitches

2.1 to 3.6mm

(at 1-inch intervals)

7 to 12 stitches

2.1 to 3.6mm

(at 1-inch intervals)

7 to 12 stitches

2.1 to 3.6mm

(at 1-inch intervals)

7 to 12 stitches

Differential

motion

Yes

Lifting

amount

presser

9mm

10mm

Upper puller

drive

Belt type

Belth type

Belt type

Roller width

14.9mm

Roller shape

Standard

type narrow

roller

(35826X) Standard

type narrow

roller

(35826X) Standard

type narrow

roller

(35826X)

Inverted

type narrow

roller

(35875AW)

Standard type wide

roller

(35826X) Standard

type narrow

roller

(35826X)

Optional roller

Inverted type wide

roller (35826CB)

Rubber type wide

roller (35826DZ)

Inverted type wide

roller (35826CB)

Rubber type wide

roller (35826DZ)

Inverted type wide

roller (35826CB)

Rubber type wide

roller (35826DZ)

Inverted type wide

roller (35826CB)

Rubber type wide

roller (35826DZ)

Standard type

wide roller

(35826X)

Rubber type wide

roller (35826CB)

Inverted type wide

roller (35826CB)

Rubber type wide

roller (35826DZ)

Presser

width

(front view)

Wide

Unevenness

of throat

plate

1.0mm

2.4mm

Feed shape

(side view)

0.8 mm of

unevenness

0.8 mm of

unevenness

Standard

type folder

23420

AY18-1/8

23420

AY18-1/8

23420

AY18-1/8

23420

AY18-1/8

23420

AY18-1/8

234-20

AY18-1/8

Sewing

speed

(rpm)

3500

Max.

sewing

speed

(rpm)

4500

* In regard to the JUKI part numbers, refer to [10. Maintenance-(1) Spare parts.]

– 3 –

MEMO

– 4 –

3. Description of US model code

Model name: Feed-off-the-arm, 3-Needle, Double Chainstitch Machine

123 4567891011

358 00

Code Puller drive

B Belt type D Clutch type (mechanical type) P Same as "D", only for PZ

Code Application and outline

QW Same as above, but 1 piece feed mechanism

WDN

WDR Same as above, but 1 piece feed mechanism RWH Same as WDN, but rubber type wide roller equipped

RU Same as above, but 1 piece feed mechanism

Code

32 3.2mm 36 3.6mm

Differential feed mechanism/Double lap seam/For light- and mediumweight materials (denim fabric of 6 to 9 oz.)/1 mm of throat plate unevenness/Standard type wide roller equipped/Denim, jacket, working clothes, etc.

Differential feed mechanism/Double lap seam/For medium- and heavyweight materials (denim fabric of 10 – 14 oz.)/2.4 mm of throat plate unevenness/Standard type wide roller equipped/Denim, jacket, working clothes, etc.

Differential feed mechanism/Double lap seam/For medium- and heavyweight materials (denim fabric of 10 – 14 oz.)/2.4 mm of throat plate unevenness/Standard type narrow roller equipped/Denim, jacket, working clothes, etc.

Differential feed mechanism/Double lap seam/For heavy-weight materials (denim fabric of 15 – 16 oz.)/2.4 mm of throat plate unevenness/Standard type wide roller equipped/Denim, felt, etc.

Z Same as DNU and DRU, but inverted type narrow roller equipped

Classification of needle gauge 8 3.2mm 9 3.6mm

– 5 –

4. Description of model code

Machine name: Feed-off-the-arm, 3-needle, double chainstitch machine

123456789101112131415

35800 –AA

6 to 10 Name

Sewing material Puller drive Roller width Roller shape

BLW 9 3 3.6mm ● BQW 8 3 3.2mm ● Belt type 14.9mm 1.0mm

BQW 9 3 3.6mm ● BWDN 8 3 3.2mm ● Steel gear

BWDN 9 3 3.6mm ● BWDR 8 3 3.2mm ● Belt type 14.9mm BWDR 9 3 3.6mm ● BRWH 9 3 3.6mm ● Rubber roller DNU 8 3 3.2mm ● DNU 9 3 3.6mm ● DRU 8 3 3.2mm ● DRU 9 3 3.6mm ● DZ 32 3 3.2mm ● DZ 36 3 3.6mm ● PZ 32 3 3.2mm ● PZ 36 3 3.6mm ● BWW 8 3 3.2mm ● BWW 9 3 3.6mm ● DWW 8 3 3.2mm ● DWW 9 3 3.6mm ●

For light- and medium-

weight materials (6 to 9 oz.),

denim, working clothes,

pants, etc.

For medium- and heavy-

weight materials (10 to 14

oz.), denim, etc.

For extra-heavy-weight

(15 to 16 oz.), denim, felt,

etc.

Stitch count

Needle

gauge

Differential motion

Yes No

Clutch type

Belt type

Clutch type

11.9mm

14.9mm

Unevenness

of throat plate

Steel gear

2.4mm

Steel gear

(inverted)

Steel gear

– 6 –

5. Names of machine head

Belt drive upper

feed roller

Clutch drive upper feed roller End cover Gear cover (front) Clutch rod Bobbin thread guide pipe Gear cover (rear) Clutch lever Differential regulation lever Swing guard Cover for needle bar and roller Pressure regulating nut Oil gauge (front) Upper feed roller Pressure regulating plate spring assembly Oil discharge screw (front) Needle clamp Oil circulation inspection window (rear) Cylinder side cover Right and left guide plates Thread tension knob Gauge plate Guide finger Thread guide Feed rocking lever eccentric pin Oil circulation inspection window (front) Looper cover Looper push button Throat plate Front top cover Three folding device Rocking balance thread guide Rear top cover Presser Needle thread rocking balance Needle thread guide path Needle thread adjusting path Needle bar Needle thread small tensioner

Window screw for stitch length adjustment

Needle guard & needle cooling pipe

Upper feed roller assembly

Roller pressure regulating spring Roller pressure regulating screw Needle thread lever-thread guide

Needle thread support adjuster

– 7 –

6. How to pass the threads

(1) Differential feed

How to pass the needle threads and looper threads

1. Drawing of differential feed threading (sample model: 35800DNU & BWDN) Needle thread: 1 for left needle thread, 2 for middle needle thread, 3 for right needle thread Looper: 4 for front looper, 5 for middle looper, 6 for rear looper Follow the drawing below to pass the threads.

Tension section

[Model: 35800DNU]

Needle section

Looper section

Looper thread cam section

– 8 –

(2) 1 piece feed

How to pass the needle threads and looper threads

1. Drawing of 1 piece feed threading (sample model: 35800DRU & BWDR) Needle thread: 1 for left needle thread, 2 for middle needle thread, 3 for right needle thread Looper: 4 for front looper, 5 for middle looper, 6 for rear looper Follow the drawing below to pass the threads.

Tension section

[Model: 35800DRU]

Needle section

Looper section

Looper thread cam section

– 9 –

7. Standard adjustment

(1) How to remove the gauge components and upper feed roller (differential feed

mechanism and 1 piece feed mechanism)

Disassembly procedure

1. Remove the gauge, its related parts (needle , presser yoke , throat plate , differential feed dog , and main feed dog ), the cover, its related parts (cover for needle bar and roller and looper cover ), upper feed roller assembly , roller pressure regulating screw , and pressure regulating plate spring assembly before adjustment.

(Caution) The directions of front, rear, right, and left during standard adjustment are based on the operator

working position. Therefore, the forward rotation of the pulley is counterclockwise.

Left side of the machine head

Right side of the machine head

Rear side of the machine head

Pressure regulating plate spring and its related parts

Left side of the machine head

Gauge and its related parts

(Differential feed mechanism)

Gauge and its related parts

(1 piece feed mechanism)

– 10 –

Disassembly procedure

Removal procedure of the gauge and upper feed roller

1. Loosen the setscrew and remove the needle bar and the roller cover together with the face cover and the packing, which are attached to the rear side.

2. Loosen the nut with a 3/8” spanner and remove the washer and clutch rod .

3. Remove the roller pressure regulating screw .

4. Loosen the setscrew securing the upper feed roller shaft with a 3/32" key wrench, remove the setscrew

securing the link, lift the upper feed roller shaft and the guide finger , and remove the upper feed

roller assembly .

(Caution) When the upper feed roller shaft is lifted, the guide finger interferes with the lift lever

crank . Therefore, remove the upper feed roller assembly after lifting the lift lever crank

slightly.

5. Loosen the pressure regulating nut and remove the pressure regulating plate spring assembly .

6. Loosen each setscrew that securing corresponding needles and remove three of each needle .

7. Loosen the setscrew securing the presser yoke with a 5/64" or 2mm key wrench and remove the presser yoke after lifting the presser shaft .

8. Loosen the setscrew with a 3/32" key wrench and remove the setscrew securing the cover. Removal of the setscrew allows you to remove the looper cover and spring stud .

9. Loosen three setscrews securing the throat plate and remove the throat plate .

10. Loosen the setscrew and remove the differential feed dog .

11. Loosen the setscrew and remove the main feed dog .

12. Loosen the setscrews securing the loopers and remove the loopers .

(Caution) The disassembly procedure mentioned above mainly describes about the differential feed

mechanism. As to the 1 piece feed mechanism, the differential feed dog and setscrew are not provided.

– 11 –

(2) Timing between the looper and needle bar

Standard Adjustment

1. Timing between the looper and needle bar (synchronization) Gauging equipment is mounted to perform synchronization adjustment. The reference state is that there is no clearance between the bottom surface of the lower needle bar bushing

and the top surface of the timing gauge when the steel rod touches the throat plate by rotating the pulley in the forward and backward directions. (Be sure to rotate the pulley in both directions to check the clearance.) The allowable clearance range is from 0 to 0.1 mm.

(Caution) The allowable clearance between the steel rod and the throat plate ranges from 0 to 0.1

mm when the bottom surface of the lower needle bar bushing touches the top surface of the timing gauge ahead of the other touch by rotating the pulley in both directions.

Right-left direction

Clearance at rotation in both directions: 0 to 0.1 mm

19mm

Touch between the steel rod and throad plate

Match mark

Clockwise-counterclockwise direction

– 12 –

Adjustment Procedures Results of Improper Adjustment

1. How to install and use the synchronization adjustment gauge (1) Put the steel rod in the front looper base and tighten the

setscrew .

(Caution) Use a key wrench (3 mm) instead of the steel rod if

necessary.

(2) Loosen the setscrew slightly and move the front looper base

with the steel rod integrated to the most left position. (3) Install the throat plate and tighten the setscrew . (4) Rotate the pulley to move the steel rod to the most left position,

set the clearance between the right surface of the steel rod and the

left surface of the throat plate to 19 mm, and tighten the setscrew

securing the front looper base .

(5) Rotate the pulley counterclockwise and stop it when the steel rod

touches the left surface of the throat plate .

(6) Mount the timing gauge to the needle bar . Be sure to mount

the timing gauge so that the top surface of the timing gauge

touches the bottom surface of the lower needle bar bushing .

(Caution) Use a clip instead of the timing gauge if necessary.

(7) When the pulley is rotated clockwise, the steel rod moves from

side to side.

Touch the steel rod with the left surface of the throat plate again.At

this moment, make sure that the clearance between the bottom

surface of the lower needle bar bushing and the top surface of

the timing gauge is within the allowable range.

(Caution) The bottom surface of the lower needle bar bushing

may touch the top surface of the timing gauge ahead of the other touch. In such a case, make sure that the clearance between the steel rod and the throat plate

is within the allowable range.

(8) If the timing between the looper (steel rod ) and the needle bar

is inappropriate, follow the procedure below.

oImproper synchronization position

adjustment may cause stitch skipping or thread breakage.

2. Corrective points and corrective measures (1) For adjusting the timing between the looper (steel rod ) and the

needle bar , loosen 9 setscrews securing the rear top cover

and remove the rear top cover and the packing. (2) Loosen 3 fixing nuts securing the front and rear main shaft

couplings ( and ) and engage a key wrench (3/32") with the

setscrew to move the front main shaft coupling in the clockwise-

counterclockwise direction for adjustment while keeping the rear

main shaft coupling unmoved. (For the fixing nut , use a 1/4"

spanner.)

(Caution) 1. Align the match marks.

2. For moving the front main shaft coupling , temporarily tighten one of the fixing nuts , which is close to the match mark, and make an adjustment.

oTo increase the clearance between the steel rod and throat plate

, rotate the front main shaft coupling clockwise.

oTo decrease the clearance between the steel rod and throat plate

, rotate the front main shaft coupling counterclockwise.

(3) After adjustment, put the rear top cover and packing back on

and tighten the setscrew .

– 13 –

(3) Adjustment of the needle entry positions in the right-left and front-rear directions

Standard Adjustment

1. Needle entry

1) Needle entry position in the right-left direction Mount 3 needles to the needle clamp . The standard needle entry position "A" in the right-left direction is the center of the needle hole of the throat plate .

2) Needle entry position in the front-rear direction The standard needle entry position in the front-rear direction is decided under the condition that the clearance between the needle and needle hole of the throat plate , "B", is the same for all of 3 positions.

(Caution) Adjust the needle entry position in accordance with the temporary needle bar height of

12.5 mm. Refer to "(5) Adjustment of the needle bar height".

Right-left direction

Clockwise-counterclockwise direction

Hole at the top of the needle bar

Front-rear

direction

Same in 3 needles

Center

Clockwise-counterclockwise direction

– 14 –

Adjustment Procedures Results of Improper Adjustment

1. Checking procedure of needle entry (1) Mount 3 needles to the needle clamp and tighten the setscrew

(2) Loosen the needle bar holding screw , set the temporary needle

bar height (12.5 mm), and tighten the needle bar holding screw {6} temporarily (approximately 4 turns of the needle bar ).

(3) Insert the torque rod into the hole at the top of the needle bar

and rotate the needle bar in the right-left direction to adjust the needle entry position in the front-rear and right-left directions.

(Caution) 1. When the needle position is not in the center of

the needle hole of the throat plate in the right-left direction, follow the procedure below.

2. For needle entry adjustment, mount the rear needle guides temporarily and make sure that 3 needles touch evenly.

2. Needle entry adjustment (1) For adjusting the needle entry position in the right-left direction,

remove 6 setscrews securing the front top cover to remove the front top cover and packing .

(2) Loosen the hexagon head bolt , engage a driver with the eccentric

pin , and rotate the driver in the right-left direction. Then, the

sylinder arm moves in the right-left direction. (3) Adjust the needle entry position in the right-left direction. o Rotation of the eccentric pin clockwise moves the cylinder arm

leftward. o Rotation of the eccentric pin counterclockwise moves the cylinder

arm rightward. (4) After adjustments, tighten the hexagon head bolt . (5) After adjusting the needle entry position, put the front top cover

and packing back on and tighten the setscrew .

o Improper needle entry position

adjustment may cause stitch skipping, needle breakage, or thread breakage.

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+ 42 hidden pages

Union Special 35800 Parts List

Introduction

CONTENTS

1. Specifications

(1) Roller mechanism/clutch type

(2) Roller mechanism/belt type

2. Model list

3. Description of US model code

4. Description of model code

5. Names of machine head

6. How to pass the threads

(1) Differential feed

(2) 1 piece feed

7. Standard adjustment

(2) Timing between the looper and needle bar

(3) Adjustment of the needle entry positions in the right-left and front-rear directions