JUKI 35800 Series Quick start guide

40052737
No.E376-00
ENGINEER’S MANUAL
Feed-off-the arm, 3-Needle, Double Chainstitch Machine
35800 Series
®

Introduction
This Engineer’s Manual is written for the technical personnel who are responsible for the service and mainte-
nance 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.

CONTENTS
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 .........................................................................................................49
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
12.Troubles and corrective measures........................................................... 53

– 1 –
No. Specifications
35800DLU9 35800DNU8/9 35800DZ32/36 35800DRU8/9 35800PZ32/36 35800DWW8/9
1Stitch type 3-needle, 6-thread, double chainstitch machine (401 LSc-3)
2 Application Denim, working clothes, felt, etc.
3Max. sewing speed 4500 rpm
4Sewing speed 3500 rpm
8 gauge: 3.2 mm, total width: 6.4 mm
9 gauge: 3.6 mm, total width: 7.2 mm
6Stitch length 2.1 to 3.6 mm (standard: 3.2 mm) at 1-inch intervals
UY130GS (standard) (Caution 1)
125 (#21) 140 (#24)
8Needle 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
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
16 Lubrication Automatic rotary pump lubrication 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
20 Temperature: 5 - 35°C, humidity: 35 - 85% (No dew condensation permissible)
21
Supply voltage/frequency Rated voltage ±10%, 50/60Hz
1. Specifications
Model
Item
7Needle (standard size)
5 Needle gauge
17 Lubricating oil
18 Oil tank capacity
(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.
19 Installation
(1) Roller mechanism/clutch type
14 Feed roller shape
15 Feed adjustment
Working temperature/
humidity ranges

– 2 –
No. Specifications
35800BLW9 35800BQW8/9 35800BWDN8/935800BWDR8/9 35800BRWH9 35800BWW8/9
1Stitch type 3-needle, 6-thread, double chainstitch machine (401 LSc-3)
2 Application Denim, working clothes, felt, etc.
3Max. sewing speed 4500rpm
4Sewing speed 3500rpm
8 gauge: 3.2 mm, total width: 6.4 mm
9 gauge: 3.6 mm, total width: 7.2 mm
6Stitch length 2.1 to 3.6 mm (standard: 3.2 mm) at 1-inch intervals
UY130GS (standard) (Caution 1)
125 (#21) 140 (#24)
8Needle 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
Standard Rubber Standard
(wide type) (wide type) (wide type)
14 Lifting amount of presser 9mm 10mm
Main feed: Slide type stitch pitch adjusting system
Differential feed Differential feed
lever adjusting 1 piece feed lever adjusting 1 piece feed
system system
16 Lubrication Automatic rotary pump lubrication 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
20 Temperature: 5 - 35°C, humidity: 35 - 85% (No dew condensation permissible)
21
Supply voltage/frequency Rated voltage ±10%, 50/60Hz
(2) Roller mechanism/belt type
13 Feed roller shape
15 Feed adjustment
Working temperature/
humidity ranges
Model
Item
7Needle (standard size)
5 Needle gauge
17 Lubricating oil
18 Oil tank capacity
(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.
19 Installation

135800BLW9
235800BQW8
335800BQW9
435800BWDN8
535800BWDN9
635800BWDR8
735800BWDR9
835800BRWH9
935800BWW8
10 35800BWW9
Double lap seam, hip overlapped seam
(Denim fabric of 10 to 14 oz.)
For medium-weight to heavy-weight materials
Double lap seam, hip overlapped seam
(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 (denim fabric of 10 to 14 oz.)
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.
For heavy-weight to extra-heavy-weight materials
2. Model list
The standard model is the feed-off-the-arm 3-needle, double chainstitch machine for double lap seam
– 3 –
(1) Model list using the roller mechanism of the clutch type
Needle
Number of needles
3 pieces as
standard
130GS
(140)
2-3
130GS
(140)
2-3
130GS
(140)
2-3
130GS
(140)
2-3
130GS
(140)
2-3
Number of
threads
6 pieces as
standard
4-6
4-6
4-6
4-6
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
Yes
No
No
Yes
Lifting
amount
of
presser
9mm
9mm
9mm
9mm
10mm
Upper puller
drive
Clutch type
Clutch type
Clutch type
Clutch type
Clutch type
Roller width
11.9mm
11.9mm
11.9mm
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
Narrow
Narrow
Narrow
Wide
Unevenness
of throat
plate
2.4mm
2.4mm
2.4mm
2.4mm
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
3500
3500
3500
3500
Max.
sewing
speed
(rpm)
4500
4500
4500
4500
4500
135800DNU8
235800DNU9
335800DZ32
435800DZ36
535800DRU8
635800DRU9
735800PZ32
835800PZ36
935800DWW8
10 35800DWW9
No. Model Application
Double lap seam, denim (denim fabric of 6 to 9 oz.),
working clothes, working pants, etc
For light-weight to medium-weight materials
Double lap seam,
denim (denim fabric of 6 to 9 oz.), jacket, working clothes, etc.
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
Double lap seam/high throw feed eccentric mechanism
Denim (denim fabric of 15 to 14 oz.), felt, etc.
For heavy-weight to extra-heavy-weight materials
(2) Model list using the roller mechanism of the belt type Needle
Number of needles
3 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
Number of
threads
6 pieces as
standard
4-6
4-6
4-6
4-6
4-6
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
No
Yes
No
No
No
Lifting
amount
of
presser
9mm
9mm
9mm
9mm
9mm
10mm
Upper puller
drive
Belt type
Belt type
Belt type
Belth type
Belt type
Belt type
Roller width
14.9mm
14.9mm
14.9mm
14.9mm
14.9mm
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
Wide
Wide
Wide
Wide
Wide
Unevenness
of throat
plate
1.0mm
1.0mm
2.4mm
2.4mm
2.4mm
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
3500
3500
3500
3500
3500
Max.
sewing
speed
(rpm)
4500
4500
4500
4500
4500
4500
No. Model Application
* In regard to the JUKI part numbers, refer to [10. Maintenance-(1) Spare parts.]

MEMO
– 4 –

– 5 –
3. Description of US model code
Model name: Feed-off-the-arm, 3-Needle, Double Chainstitch Machine
123 4567891011
35800
Code Puller drive
BBelt type
DClutch type (mechanical type)
PSame as "D", only for PZ
Code Classification of needle gauge
83.2mm
93.6mm
32 3.2mm
36 3.6mm
Code Application and outline
Differential feed mechanism/Double lap seam/For light- and medium-
weight materials (denim fabric of 6 to 9 oz.)/1 mm of throat plate un-
evenness/Standard type wide roller equipped/Denim, jacket, working
clothes, etc.
QW Same as above, but 1 piece feed mechanism
Differential feed mechanism/Double lap seam/For medium- and heavy-
weight materials (denim fabric of 10 – 14 oz.)/2.4 mm of throat plate
unevenness/Standard type wide roller equipped/Denim, jacket, work-
ing clothes, etc.
WDR Same as above, but 1 piece feed mechanism
RWH Same as WDN, but rubber type wide roller equipped
Differential feed mechanism/Double lap seam/For medium- and heavy-
weight materials (denim fabric of 10 – 14 oz.)/2.4 mm of throat plate
unevenness/Standard type narrow roller equipped/Denim, jacket, work-
ing clothes, etc.
RU Same as above, but 1 piece feed mechanism
Differential feed mechanism/Double lap seam/For heavy-weight ma-
terials (denim fabric of 15 – 16 oz.)/2.4 mm of throat plate uneven-
ness/Standard type wide roller equipped/Denim, felt, etc.
Z Same as DNU and DRU, but inverted type narrow roller equipped
LW
WDN
NU
WW

– 6 –
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 ●
4. Description of model code
Machine name: Feed-off-the-arm, 3-needle, double chainstitch machine
123456789101112131415
35800 –AA
Differential motion
Yes No
For light- and medium-
weight materials (6 to 9 oz.),
denim, working clothes,
pants, etc.
Belt type
Clutch type
Clutch type
14.9mm
11.9mm
Steel gear
Steel gear
(inverted)
Steel gear
2.4mm
For medium- and heavy-
weight materials (10 to 14
oz.), denim, etc.
For extra-heavy-weight
(15 to 16 oz.), denim, felt,
etc.
Needle
gauge
Stitch
count
Unevenness
of throat plate

– 7 –
5. Names of machine head
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 Window screw for stitch length adjustment Upper feed roller assembly
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 Roller pressure regulating spring
Oil circulation inspection window (front) Looper cover Roller pressure regulating screw
Looper push button Throat plate Needle thread lever-thread guide
Front top cover Three folding device Rocking balance thread guide
Rear top cover Presser Needle thread rocking balance
Needle thread guide path Needle guard & needle cooling pipe Needle thread support adjuster
Needle thread adjusting path Needle bar Needle thread small tensioner
Belt drive upper
feed roller

– 8 –
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.
4
3
2
1
56
5
64
3
2
Tension section
[Model: 35800DNU]
Needle section
Looper section
Looper thread cam section
1
6. How to pass the threads
(1) Differential feed

– 9 –
2
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.
(2) 1 piece feed
5
64
3
[Model: 35800DRU]
1
Tension section
4
3
2
1
56
Needle section
Looper section
Looper thread cam section

– 10 –
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)

– 11 –
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.

– 12 –
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.
(2) Timing between the looper and needle bar
19mm
Clearance at rotation in both
directions: 0 to 0.1 mm
Touch between the steel rod
and throad plate
Match mark
Clockwise-counterclockwise
direction
Right-left direction
Standard Adjustment

– 13 –
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.
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 .
oImproper synchronization position
adjustment may cause stitch
skipping or thread breakage.
Adjustment Procedures Results of Improper Adjustment

– 14 –
(3) Adjustment of the needle entry positions in the right-left and front-rear directions
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".
Center
Hole at the top of the
needle bar
Clockwise-counterclockwise direction
A
B
Same in 3 needles
Right-left direction
Front-rear
direction
Clockwise-counterclockwise direction
Standard Adjustment

– 15 –
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 .
oImproper needle entry position
adjustment may cause stitch
skipping, needle breakage, or
thread breakage.
Adjustment Procedures Results of Improper Adjustment

– 16 –
(4) Looper adjustment
1) Looper return
When each looper ( , , and ) is at the most left position, the standard distance from the tip of each
looper ( , , and ) to the center of each needle ( , , and ) is 3.6 mm (9/64").
1. Standardization of the front looper
When the front looper is at the most left position, measure the distance from the tip of the front looper
to the center of the left needle with the gauge and a scale and adjust the distance to the
standard value, i.e. 3.6 mm (9/64").
2. Standardization of middle and rear loopers
When the tips of the middle and rear loopers ( and ) are simultaneously aligned with each left
surface of the middle and right needles as well as the tip of the front looper with the left surface of the
left needle , the middle and rear loopers are in the standard positions.
(Caution) For the front looper , the looper return is adjusted with the gauge and a scale, and for
the middle and rear loopers ( and ), the looper return is adjusted by aligning the tips
of the middle and rear loopers ( and ) with the left surfaces of the needles ( and ),
respectively.
• •
Front-rear direction
Alignment
2) Adjustment of the clearance between the looper and needle
When the tips of each looper ( , , and ) are at the center of each needle ( , , and ), the standard
clearance is 0.0mm (slight touch).
After adjusting the rear needle guide , make sure again that the clearance between the loopers ( , ,
and ) and the needles ( , , and ) is 0.0 mm respectively, and perform final adjustment of the clearance
after threading.
(Caution) If clearance adjustment is performed without the rear needle guide , a little strongly touch
the tips of the loopers ( , , and ) with the needles ( , , and ), respectively.
Alignment 3.6mm
9/64
Front-rear direction
• •
Center of needle
Looper tip
Clearance of 0.0 mm (slight touch)
Clearance of
0.0 mm
(slight touch)
Right-left direction
Standard Adjustment