JUKI MO-6800S Series User manual
TRIAL MODE − a valid license will remove this message. See the keywords property of this PDF for more information.
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For the sewing machine, automatic machine and ancillary devices (hereinafter collectively referred to as
"machine"), it is inevitable to conduct sewing work near moving parts of the machine. This means that there
is always a possibility of unintentionally coming in contact with the moving parts. Operators who actually
operate the machine and maintenance personnel who are involved in maintenance and repair of the machine
are strongly recommended to carefully read to fully understand the following SAFETY PRECAUTIONS
before using/maintaining the machine. The content of the SAFETY PRECAUTIONS includes items which
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DANGER :
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TO ENSURE SAFE USE OF YOUR SEWING MACHINE
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❶• There is the possibility that slight to serious
injury or death may be caused.
• There is the possibility that injury may be
caused by touching moving part.
❶
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SAFETY PRECAUTIONS
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v
Precautions to be taken so as to use the MO-6800S Series more safely
1. So as to avoid electric shock hazards, do not open the cover of the electrical box of the
motor or touch any part inside the electrical box with the power to the machine turned ON.
1. To prevent possible personal injury, never operate the machine with the belt cover and the
eye guard removed.
2. To protect against possible personal injury resulting from being caught in the motor, use a
motor that is provided with a motor pulley cover.
3. To avoid electric shock hazards, never operate the machine with the ground wire for the
power supply removed.
4. During operation, be careful not to allow your or any other person’s head, hands or ¿ngers
to come close to the handwheel, V belt and motor so as to prevent possible personal injury
that may occur when your hands¿ngers are caught in the machine. Also, do not place any-
thing close to them.
5. So as to avoid possible injury to your hands and ¿ngers, do not put any of them near the
cloth cutting knife and the needle when turning the power to the machine or while the ma-
chine is in operation.
6. To prevent possible injury to your hands and ¿ngers, do not put any of them inside the eye
guard while the machine is in operation.
7. To avoid electric shock hazards and accidents arising from damaged electrical components,
be sure to turn OFF the power switch before inserting/detaching the power plug.
8.
So as to protect against possible personal injury resulting from abrupt start of the machine,
make sure to turn OFF the power to the machine when you leave your machine.
9. In the event of a power failure, be sure to turn OFF the power to the machine to protect
against possible personal injury resulting from abrupt start of the machine.
10. So as to protect against possible personal injury resulting from abrupt start of the machine,
remove the belt cover, motor pulley cover and the V belt after turning OFF the power to the
machine and con¿rming that the sewing machine will not run even by depressing the start
pedal.
11. Before inspecting, adjusting or cleaning the machine, threading the machine head or replac-
ing the needle, so as to protect against possible personal injury resulting from abrupt start
of the machine, be sure to turn OFF the power to the machine so as to prevent an accident
and con¿rm that the sewing machine will not operate even when depressing the foot pedal
of the sewing machine.
12. In order to protect against personal injury due to a fall of the sewing machine head, never
carry the sewing machine by holding the cloth plate cover. If you carry the sewing machine
by holding the cloth plate cover, the cover can break to allow the sewing machine head to
fall resulting in personal injury.
13. Be careful of handling this product so as not to pour water or oil, shock by dropping, and
the like since this product is a precision instrument.
14. Please operate this machine in 80of the maximum speed in the ¿rst four weeks for en-
gagement. After four weeks, please do not operate under the maximum speed until replacing
the new lubrication oil.
15. Periodically maintain and clean the machine to ensure and extend the usage term of the
machine.
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vi
In addition, be aware that the safety devices such as the eye protection coverand ¿nger guard
are sometimes omitted in the sketches, illustrations and ¿gures included in the Instruction Manual
for the explanation's sake. In the practical use, never remove those safety devices.
CAUTION
CAUTION BEFORE OPERATION
• Read and understand well the content of this instruction book.
• Know the functions of major parts and understand the notices.
• Truely realize the meanings of all warning tags.
• Realize and be familiar with how to operate this machine.
• Operators please to keep well mental status.
• Operators shall wear appropiate and proper working suits.
• Develop the familiarity of how to operate the machine if needed.
WARNING :
To avoid malfunction and damage of the machine, con¿rm the following.
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DECLARATION OF INCORPORATION OF PARTLY COMPLETED MACHINERY
We hereby declare that the sewing machine (sewing head) described below ;
1. Must not be put into service until the machinery to which it is incorporated has been declared in
conformity with provisions of the Machinery Directive 2006/42/EC,and
2. Conforms to the essential requirements of the Machinery Directive 2006/42/EC, described in the
technical documentation,and
3. To be prepared with above technical documentation compiled in accordance with part B of Annex
VII,and
4. Also to conform to the RoHS Directive 2011/65/EU
5. Relevant information on which should be transmitted in response to a reasoned request by the
national authorities,by the electronic method or other according to the request.
Applied harmonized standards, in particular :
EN ISO12100, EN ISO10821, EN 50581
Manufacturer :
JUKI CORPORATION
2-11-1, Tsurumaki, Tama-shi, Tokyo, Japan
Model
Description Industrial Sewing Machine
Function make stitches and sew
MO-6800S Series
vii
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viii
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ix
CONTENTS
1. SPECIFICATION ............................................................................................................1
2. NAMES OF MAJOR PARTS.......................................................................................... 2
3. INSTALLATION.............................................................................................................. 3
4. LUBRICATION AND DRAINAGE .................................................................................. 6
5. THREADING .................................................................................................................. 8
6. ADJUSTING THE THREAD TENSION........................................................................ 11
7. REPLACE THE NEEDLE............................................................................................. 12
8. ADJUSTING THE STITCH LENGTH........................................................................... 13
9. ADJUSTING THE DIFFERENTIAL FEED RATIO ....................................................... 13
10. REPLACE THE KNIVES.............................................................................................. 14
11. ADJUSTING THE OVEREDGE WIDTH....................................................................... 15
12. ADJUSTING THE NEEDLE HEIGHT .......................................................................... 15
13. ADJUSTING THE PRESSER FOOT ........................................................................... 16
14. ADJUSTING THE FEED DOG..................................................................................... 18
15. THE RELATIONSHIP BETWEEN THE NEEDLE AND THE LOOPER ....................... 19
16. ADJUSTING THE AMOUNT OF TRAVEL OF THE DOUBLE CHAINSTITCH LOOP-
ER................................................................................................................................. 21
17. MAINTENANCE ........................................................................................................... 22
18. DIMENSIONS USE TO ADJUSTING THE LOOPER AND THE NEEDLE GUARD
..... 23
19. DIMENSIONS RELATED TO THE POSITION OF THE THREAD TAKE-UP AND
THE LOOPER THREAD CAM STANDARD ADJUSTMENT.................................... 24
20. TABLE DRAWING ....................................................................................................... 26
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1. SPECIFICATION
MO-6804S MO-6814S MO-6816S
Sewing speed Max. 7,000 sti/min (Excluding some subclass models)
Stitch length 0.6 to 3.8 (4.5) mm / 60H: 1 to 4.5 mm
Needle gauge - 2.0 mm 3.0, 5.0 mm
Overedge width 1.5, 4.0 mm 2.0, 3.0, 4.0 mm 4.0, 5.0, 6.0 mm
Differential feed ratio Gathering stitch 1 : 2 (Max. 1 : 4) / 60H 1 : 1.7
Stretching stitch 1 : 0.7 (Max. 1 : 0.6) / 60H 1 : 0.9
Needle DC × 27 (Standard)
Presser foot lift 5 to 7 mm
Lubricating oil JUKI MACHINE OIL #18
Weight 27 kg
Noise
-Equivalent continuous emission sound pressure level (LpA) at the workstation:
A-weighted value of 83.0 dB; (Includes KpA = 2.5 dB); according to ISO 10821-
C.6.2 - ISO 11204 GR2 at 6,500 sti/min.
-Sound power level (LWA);
A-weighted value of 88.0 dB; (Includes KWA = 2.5 dB); according to ISO 10821-
C.6.2 - ISO 3744 GR2 at 6,500 sti/min.
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2. NAMES OF MAJOR PARTS
❶❺❸❹❷❻❶Presser foot lifting lever
❷Presser foot (asm.)
❸Thread stand
❹Oil gauge
❺Pulley
❻Cloth plate cover
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3. INSTALLATION
After unpacking, do not carry the sewing
machine holding the lower section of cloth
plate cover ❶.
1) Install, air-blower case ❸and rubber cushion ❹
to frame support plate ❷, referring to the table
drawing and parts list.
WARNING :
• Machine installation should only be carried out by a quali¿ed technician.
• Contact your dealer or a quali¿ed electrician for any electrical work that may need to be done.
• The sewing machine weighs 27 kg. The installation should be carried out by two or more people.
• Do not connect the power cord until installation is complete. The machine may operate if the treadle
is depressed by mistake, which could result in injury.
• Use both hands to hold the machine head when tilting it back or returning it to its original position. If
only using one hand, the weight of the machine head may be too heavy to hold, and may cause human
physical injuries.
• To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
❶❷❸❹
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2) Assemble the waste disposal set and the thread stand.
3) Assemble the motor starting pedal ❺to the left side, and the presser foot pedal ❻to the right side.
❺❻
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4) The correct direction of rotation of the sewing
machine is clockwise.
Never allow the machine to rotate in the
reverse direction. If the machine rotates
counterclockwise, the oil pump will fail to
function resulting in seizure.
The best tension of the motor belt ❼is that the belt
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to the table shown below for the size of pulley ❽
and the sewing speed.
(The above applies to both the machine with ta-
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one.)
5) Then, close belt cover ❾. Tighten screws.
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10 mm
Sewing speed
(sti/min)
Motor pulley Diameter (mm) / V belt (in inches)
60 Hz 50 Hz
4,500 70 / 33 85 / 33
5,000 80 / 33 95 / 34
5,500 85 / 33 105 / 35
6,000 95 / 34 115 / 36
6,500 100 / 35 125 / 38
7,000 110 / 36 135 / 39
❾❼❽
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(1) Lubrication oil
4. LUBRICATION AND DRAINAGE
1) Remove oil sight window ❶IURPWKHRLOLQOHW$GGOXEULFDWLQJRLOVSHFL¿FDOO\PDGHIRUPDFKLQHVZKLFKUXQ
at a super-high speed (JUKI MACHINE OIL #18) supplied with the unit or equivalent through the oil inlet.
When the oil surface reaches the space between two marker lines on the oil gauge, tighten oil sight window ❶.
%HIRUHXVLQJDQHZVHZLQJPDFKLQHIRUWKH¿UVWWLPHDIWHUWKHSXUFKDVHRUWKHVHZLQJPDFKLQHZKLFKKDV
not been used for an extended period of time, the shaded sections of needle bar ❷and upper looper guide
❸have to be lubricated.
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
❶(2) Drainage and re¿ll the oil
1) Loosen the screw ❶and drain all the oil inside the
oil tank. Then, tighten the screw ❶again.
2) In order to extend the term of usage, please replace
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it every four months.
❶❷❸
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– 7 –
SILICON OIL
SILICON OIL
3) To extend the usage term, this machine has
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once every month and change it with a new one
where necessary.
Needle cooling lubrication oil : SILICON OIL
❷
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– 8 –
5. THREADING
MO-6814S
MO-6804S
WARNING :
Follow the procedures for threading. Wrong threading can cause stitching troubles such as thread
breakage, stitch skipping and puckering.
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– 9 –
MO-6814S-△△△-44H
MO-6816S
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– 10 –
MO-6816S-△△△-50H
MO-6816S-△△△-60H
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