JUKI MO-6800S/DD20 Series User manual

MO-6800S(D)/DD20 Series
INSTRUCTION MANUAL

i
CONTENTS
1. SPECIFICATION .............................................................................................................. 1
1-1. Specications of the sewing machine head ..................................................................................1
1-2. Specications of the control box .................................................................................................... 1
2. NAMES OF MAJOR PARTS............................................................................................ 2
3. INSTALLATION................................................................................................................ 3
3-1. Installing the suction device............................................................................................................3
3-2. Installing the table and the table stand ..........................................................................................5
3-3. Installing the pedal sensor ..............................................................................................................6
3-4. Attaching the connecting rod..........................................................................................................7
3-5. Air piping ...........................................................................................................................................8
3-6. Connecting the connector ............................................................................................................. 10
3-7. How to install the power plug........................................................................................................ 11
3-8. Power switch................................................................................................................................... 12
4. LUBRICATION AND DRAINAGE .................................................................................. 13
4-1. Lubrication oil .................................................................................................................................13
4-2. Drainage and rell the oil............................................................................................................... 14
4-3. Exclusive grease replenishment [only for the MO-6800D] .........................................................15
5. PREPARATION BEFORE SEWING .............................................................................. 16
5-1. Threading ........................................................................................................................................16
5-2. Adjusting the thread tension .........................................................................................................19
5-3. Replace the needle ......................................................................................................................... 20
5-4. Adjusting the stitch length.............................................................................................................21
5-5. Adjusting the di󰀨erential feed ratio ..............................................................................................21
5-6. Replace the knives .........................................................................................................................22
5-7. Adjusting the overedge width........................................................................................................23
5-8. Adjusting the needle height...........................................................................................................23
5-9. Adjusting the presser foot .............................................................................................................24
5-10. Adjusting the feed dog.................................................................................................................26
5-11. The relationship between the needle and the looper ................................................................27
5-12. Adjusting the amount of travel of the double chainstitch looper ............................................ 29
6. OPERATION PROCEDURE .......................................................................................... 30
6-1. Operation panel ..............................................................................................................................30
6-2. Font comparison table ................................................................................................................... 31
6-3. Function setting.............................................................................................................................. 32
6-4. Function setting table ....................................................................................................................33
6-5. Details of setting of the main functions .......................................................................................41
6-6. Adjusting the sensitivity of sensors .............................................................................................49
6-7. No. of pcs. counter ......................................................................................................................... 52
6-8. Initialization of the function setting data...................................................................................... 54
6-9. Hand LED light ................................................................................................................................55
6-10. Audio guidance.............................................................................................................................56
6-11. Clock setting ................................................................................................................................. 58
6-12. Backlight........................................................................................................................................60
6-13. About the USB...............................................................................................................................61
6-14. Pedal operation............................................................................................................................. 62
7. MAINTENANCE............................................................................................................. 64

ii
7-1. Periodical Maintenance Items .......................................................................................................64
7-2. How to remove the batteries...........................................................................................................65
8. ADJUSTMENT DIMENSION VALUES .......................................................................... 67
8-1. Dimensions use to adjusting the looper and the needle guard ................................................. 67
8-2. Dimensions related to the position of the thread take-up and the looper thread cam
(standard adjustment)..................................................................................................................68
9. ERROR CODE LIST ...................................................................................................... 70
10. TABLE DRAWING ....................................................................................................... 71

– 1 –
MO-6804S(D) MO-6814S(D) MO-6816S(D)
Sewing speed Max. 7,000 sti/min (Excluding some subclass models)
Stitch length 0.6 to 3.8 (4.5) mm
Needle gauge - 2.0 mm 3.0, 5.0 mm
Overedge width * 1 1.5, 4.0 mm 2.0, 3.0, 4.0 mm 4.0, 5.0, * 1 6.0 mm
Di󰀨erential feed ratio Gathering stitch1 : 2(Max. 1 : 4)
Stretching stitch1 : 0.7(Max. 1 : 0.6)
Needle DC × 27 (Standard)
Motor DD motor
Presser foot lift 5 to 7 mm
Lubricating oil JUKI MACHINE OIL #18
* 2 Grease Exclusive grease Part number: 23640204 (100 g tube)
Part number: 40006323 (10 g tube)
Weight 28 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.
1. SPECIFICATION
1-1. Specications of the sewing machine head
1-2. Specications of the control box
Supply voltage Single phase
220 to 240V
Frequency 50Hz/60Hz
Operating environment Temperature : 0 to 35˚C
Humidity : 90% or less
Input 500VA
* 1 Only for the MO-6800S
* 2 Only for the MO-6800D

– 2 –
2. NAMES OF MAJOR PARTS
󰿿Presser foot lifting lever
󱀀Presser foot (asm.)
󱀁Thread stand
󱀂Oil gauge
󱀃Pulley
󱀄Cloth plate cover
󰿿
󱀁
󱀂
󱀀
󱀄
󱀃

– 3 –
3. INSTALLATION
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 28 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 o󰀨 and ascertaining that the motor is at rest.
3-1. Installing the suction device
Inlet of the
suction
device
Suction device
mounting base
Screw
Accessory
screw
Elbow
Table
1) Attach inlet of the suction device to the table with
accessory screws supplied with the unit. Fit the
elbow in the inlet from the underside of the table.
2) Attach the dust bag mounting base to the table
with the accessory screws.

– 4 –
3) Fit pipe in Y elbow.
Connect the Y elbow side of the
pipe to the dust bag. Connect
the hose side of the pipe to the
elbow of the inlet.
Connect the air tube Ato the
solenoid valve A. Connect air
tube 󰴦to air blower 󱀃of the
machine head presser foot.
* Refer to "3-5. Air piping"
p.8 for how to connect the
solenoid valve.
4) Connect air tube 󰴧to inlet tube 󰿿. Connect the
air tube Bto the solenoid valve B.
* Refer to "3-5. Air piping" p.8 for how to
connect the solenoid valve.
To inlet tube 󰿿
To the
dust bag
To the inlet
To the solenoid valve A
To the thread trimmer
[DD22]
To presser foot
air blower 󱀃
[DD23]
󰿿

A

󰴧
󰴦
󱠈
󱠈
To the
solenoid
valve A
To the thread trimmer
To the inlet
To the
dust bag
To the
solenoid
valve B

– 5 –
1. After unpacking, do not carry the sew-
ing machine holding the lower section
of cloth plate cover 󰿿.
2. Do not hold the bottom section of the
electrical box cover 󱀀.
1) Install, air-blower case 󱀂, rubber washer 󱀄,
and rubber cushion 󱀃 to frame support plate 󱀁,
referring to the table drawing and parts list.
3-2. Installing the table and the table stand
󰿿
󱀀
󱀁
󱀂
󱀃
󱀄
2) Assemble the waste disposal set and the thread
stand.

– 6 –
3-3. Installing the pedal sensor
1) Install the pedal sensor to the table with
mounting screws 󰿿supplied with the unit.
It is necessary to install the pedal sensor at such
a position that the connecting rod is perpendicu-
lar to the table.
2) After the completion of installation of the pedal
sensor on the table, place the sewing machine
head on the table.
3) Assemble motor starting pedal 󱀀.
󰿿
󱀀

– 7 –
󰿿
󱀂󱀁
󱀁
󱀀
3-4. Attaching the connecting rod
Fix connecting rod 󰿿to installing hole 󱀂 of pedal
lever 󱀀with nut 󱀁.
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 o󰀨 and a lapse of 5 minutes or more.

– 8 –

󱀃
3-5. Air piping
1) Pass air tubes 󰿿, 󱀀, 󱀁and 󱀂 coming from
the tension releasing device and air cylinder un-
der the table.
  
DD22
󱀂
󱀁
󰿿
󱀀
󱀂
󱀁
󱀀
󰿿
󱀅󱀄
󰴦
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 o󰀨 and ascertaining that the motor is at rest.
2) Connect air tubes 󰿿, 󱀀, 󱀁and 󱀂to the solenoid valve located under the table.
Connect air tubes Aand B coming from the suction device to Aand Brespectively. Connect air tube 󰴦
to the connection port of presser foot air blower 󱀃.
* Be sure to pass air tube 󰴦 to be connected to the presser foot air blower along the upper side of presser
arm 󱀄and secure with cable clip band 󱀅.
Refer to "3-1. Installing the suction device" p.3 for details of the air tubes coming from the suction
device.

– 9 –
1) Pass air tubes 󰿿, 󱀀, 󱀁and 󱀂 coming from
the air cylinder under the table.
DD23
󱀁
󰿿
󱀀
󱀂
  
󱀂
󱀁
󱀀
󰿿
2) Connect air tubes 󰿿, 󱀀, 󱀁and 󱀂to the sole-
noid valve located under the table.
Connect air tubes Aand B coming from the suc-
tion device to Aand Brespectively.
Refer to "3-1. Installing the suction device"
p.3 for details of the air tubes coming from
the suction device.

– 10 –
3-6. Connecting the connector
WARNING :
• To protect against personal injury resulting from abrupt start of the sewing machine, be sure to
turn the power OFF, unplug the machine and wait for ve minutes or more before installing the
pedal sensor.
• To prevent damage of device caused by maloperation and wrong specications, be sure to connect
all the corresponding connectors to the specied places. (If any of the connectors is inserted into
a wrong connector, not only the device corresponding to the connector can break but also it can
start abruptly, inviting the risk of personal injury.)
• To prevent personal injury caused by maloperation, be sure to lock the connector with lock.
• Do not connect the power plug until the connection of cords is completed.
• Fix the cords while taking care not to forcibly bend them or excessively clamp them with staples.
• As for the details of handling respective devices, read carefully the Instruction Manuals supplied
with the devices before handling the devices.
1. Do not insert the power plug into the
wall outlet.
2. Check to be sure that the power switch
is turned OFF.
3. Be sure to fully insert the connectors
into the corresponding ports until they
are locked.
1) Draw out pedal sensor cable 󰿿 coming from the
electrical box to the undersurface of the table.
2) Connect pedal sensor cable 󰿿and the connec-
tor under the table.
󰿿
󰿿

– 11 –
3-7. How to install the power plug
WARNING :
1. Be sure to attach the ground wire (green/yellow) to the specied location (on the ground side).
2. Take care not to allow terminals to come in contact with each other.
1) Connect the power cord to power plug 󰿿. Con-
nect the blue and brown wires (1ø) to the power
supply side and the green/yellow wire to the
earth side as illustrated in the gure.
1. Be sure to prepare the power plug 󰿿
which conforms to the safety standard.
2. Be sure to connect the ground lead
(green/yellow) to the grounding side.
Blue
Brown
Green / Yellow
(ground wire)
AC 220-240V
1ø 220-240V
󰿿
2) Check that the power switch is in the OFF state.
Then, insert the power plug 󰿿coming from the
power switch into the plug receptacle.
In prior to the connection of the power
plug 󰿿, re-check the supply voltage spec-
ication indicated on the control box.
* The power plug 󰿿 is different in shape ac-
cording to the destination of the sewing ma-
chine.

– 12 –
Single phase 220 to 240V
󰿿
3-8. Power switch
1) Turning the power ON with the power switch 󰿿
The power to the sewing machine is placed in
the ON state when the "|" mark side of power
switch 󰿿 (1ø 220 - 240V type) is pressed; or in
the OFF state when the "○" mark side is pressed.
1. Do not strongly tap the power switch by hand.
2. If the power indicator LED on the panel does not light up after having turned ON the power
switch 󰿿, immediately turn OFF the power switch and check the supply voltage.
When you want to re-turn ON power switch 󰿿 after carrying out the aforementioned steps, it is
necessary to wait for ve minutes or more after you have turned OFF power switch 󰿿.
3. Do not place your hand or anything under the needle since the needle bar may automatically
move according to the memory switch setting when you turn ON the power to the sewing ma-
chine.
4. When you turn ON the power to the sewing machine while the full automatic mode is set se-
lected, the sewing machine will not start sewing for the sake of safety as long as the front
sensor is blocked.
If you want to re-start sewing under the full automatic mode, remove the obstacle that blocks
the front sensor, block the front sensor again with the material to be sewn and depress the
front part of the pedal once.
5. When you turn ON the power to the sewing machine
while the full automatic mode is set selected, "PEDL"
will be displayed on the operation panel as shown in the
gure on the left.
If you want to start sewing, depress the front part of the
pedal once.
6. When you turn ON the power to the sewing machine for
the first time after purchase, the sewing machine will
start under the semi-automatic mode for the sake of
safety.
Change the mode from the semi-automatic mode to any
sewing mode you want to use.
Refer to "6-5. Details of setting of the main functions"
p.41 for details of the changes made to the sewing ma-
chine.

– 13 –
4-1. Lubrication oil
4. LUBRICATION AND DRAINAGE
1) Remove oil sight window 󰿿 from the oil inlet. Add lubricating oil specically made for machines which run
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 󰿿.
2) (Only for the MO-6800S) Before using a new sewing machine for the rst time after the purchase or the
sewing machine which has not been used for an extended period of time, the shaded sections of needle
bar 󱀀and upper looper guide 󱀁have to be lubricated.
Take care not to pour too much amount of lubricating oil at the time of lubrication. If the ma-
chine is lubricated with an excessive amount of oil, oil leakage can be caused.
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 o󰀨 and ascertaining that the motor is at rest.
󰿿
󱀀
󱀁
* Only for the MO-6800S * Only for the MO-6800S
3) For the DD22 type model, periodically apply lu-
bricating oil to the oil wick at the side-cutter oil
hole in order to prevent the oil wick becoming
dry.

– 14 –
󱀀
SILICON OIL
SILICON OIL
2) In order to extend the term of usage, please replace the oil after the rst four weeks, and then replace it
every four months.
3) To extend the usage term, this machine has equipped an oil lter 󱀀. Clean up this oil lter 󱀀once every
month and change it with a new one where necessary.
Needle cooling lubrication oil : SILICON OIL
󰿿
4-2. Drainage and rell the oil
1) Loosen the screw 󰿿and drain all the oil inside
the oil tank. Then, tighten the screw 󰿿again.

– 15 –
󱀁
󱀀
󰿿
4-3. Exclusive grease replenishment [only for the MO-6800D]
* Periodical replenishment of the exclusive grease (once every one or two years) will be e󰀨ective to
ensure smooth operation of the machine.
1) Remove grease replenishing rubber plug 󰿿 from
the needle bar compartment.
2. How to replenish the looper compartment with grease
1) Remove grease replenishing rubber plug 󰿿from
the looper compartment.
2) Replenish grease by means of a tip of screw-
driver 󱀁, 󱀀 or the like. Use JUKI GREASE A for
the replenishment of grease
JUKI GREASE A: 40006323 (part number)
2) Replenish grease by means of a tip of screw-
driver 󱀁, 󱀀 or the like. Use JUKI GREASE A for
the replenishment of grease
JUKI GREASE A: 40006323 (part number)
1. How to replenish the needle bar compartment with grease
󰿿󱀁
󱀀

– 16 –
5-1. Threading
5. PREPARATION BEFORE SEWING
MO-6814
MO-6804
WARNING :
Follow the procedures for threading. Wrong threading can cause stitching troubles such as thread
breakage, stitch skipping and puckering.

– 17 –
MO-6814-  -44H
MO-6816