JUKI MO-2000 Series User manual
MO-2000 Series
SERVICE MANUAL
No.00
40267028
2-Needle, 2/3/4-Thread Overlock Sewing Machine
CONTENTS
1SPECIFICATIONS............................................................................ 1
2NAME OF EACH COMPONENT ..................................................... 2
1. Appearance ................................................................................................................. 2
2. Inside of the cover...................................................................................................... 3
3STANDARD ADJUSTMENT / DISASSEMBLY AND ASSEMBLY... 4
1. Removing the top cover............................................................................................. 4
2. Removing the cloth plate cover ................................................................................ 6
3. Removing the bottom plate ....................................................................................... 7
4. Removing the looper cover ....................................................................................... 7
5. Removing the side cover........................................................................................... 8
6. Removing the rear cover
Removing the front cover .......................................................................................... 9
7. Removing the looper cover guide............................................................................11
9. Installation of the throat plate ................................................................................. 12
10. Height of the needle bar......................................................................................... 14
11. Position of the feed dog......................................................................................... 16
12. Adjusting the stroke of the sub feed dog............................................................. 18
13. Height of the feed dog............................................................................................ 20
14. Feed dog timing...................................................................................................... 22
15. Position of the balance weights and the cams.................................................... 24
16. Projecting amount of the upper looper ................................................................ 26
17. Radius of the lower looper .................................................................................... 28
18. Adjustment of the loop lift ..................................................................................... 30
19. Timing between upper and lower looper.............................................................. 32
20. Installation of the needle guards .......................................................................... 34
21. Adjusting the looper thread take-up..................................................................... 36
22. Height and lateral position of the presser foot.................................................... 38
23. Presser foot height by the knee lifting lever........................................................ 40
24. Height of the presser foot by the micro lifter (only for the MO-2500)................ 42
25. Adjusting the oating of the disk of the thread tension controller ................... 44
26. Adjusting the tension of the thread tension controller....................................... 46
To avoid the risk of re, electric shock, injury to persons or damage to components,
especially keep the following:
• When disassembling, assembling or adjusting the sewing machine, remove the power plug.
• When assembling, be careful about the electrical cord being caught with other components,
damage to the covered parts of the cord or miswiring.
• When replacing the part(s), use the genuine part(s).
WARNING :
27. Position of the needle thread take-up thread guide............................................ 48
28. Tension of the belt.................................................................................................. 50
29. Adjusting the needle bar connection guide of the needle threader .................. 52
30. Adjusting the needle threader hook ..................................................................... 54
31. Adjusting the looper threader timing ................................................................... 56
32. Adjusting the pump unit ........................................................................................ 58
33. Position of the lower knife..................................................................................... 60
34. Engagement of the upper knife with the lower knife .......................................... 62
35. Adjusting the timing of the upper knife................................................................ 64
36. Adjusting the thread sliding segment .................................................................. 66
37. Adjusting the safety switch ................................................................................... 68
38. Position of the cloth plate...................................................................................... 70
4CIRCUIT DIAGRAM....................................................................... 72
5MAINTENANCE ............................................................................. 74
1. Lubrication................................................................................................................ 74
2. Grease application ................................................................................................... 74
3. Looper threader........................................................................................................ 74
6TROUBLES AND CORRECTIVE MEASURES ............................. 75
–1 –
No. Items Description
1 Model name 2-Needle, 2/3/4-Thread Overlock Sewing Machine (with
dierential feed adjusting)
2 Stitch choice 2 needles, 4 thread overlock
2 needles, 3 thread overlock
1 needle, 3 thread overlock
1 needle, 2 thread overlock
3 Sewing speed Up to 1,500 sti/min Rating 1,350±150 sti/min
4 Needle gauge Overlocking: 2.2 mm
5 Overedge width 2 needles, 4 thread: 4.5 to 7.0 mm
1 needle, 3 thread (right hand needle): 2.5 to 5.0 mm
1 needle, 3 thread (left hand needle): 4.5 to 7.0 mm
Roll hemming: 2.0 mm
Knife width 2.5 to 5.0 mm
6 Thread sliding segment The thread sliding segment is in synchronism with the lower
knife at its standard position.
The amount of travel of the thread sliding segment must be
nely adjustable with the overedge width adjustment knob.
7 Stitch length 1.0 to 4.0 mm (Standard 2.5 mm)
8Dierential feed 1：0.7 to 2
9 Needle bar stroke 29.4 mm
10 Presser foot height 5.8 mm to 6.0 mm
11 Presser foot height by the knee lifting lever 6.0 mm
12 Presser foot height by the micro lifter (*1) 2.5 mm
13 Feed dog height 1.3 mm (This side end of the sub feed dog P = 2.5 mm;
dierential feed ratio: 1:1)
14 Needle system (Japan) ORGAN needle HA×11SP # 11 (Standard) to # 14
Needle system (Overseas) SCHMETZ (130/705H 15X1H) # 80
15 Number of needles Max. 2
16 Number of threads to be used Max. 4
17 Needle threader Operated by the manual lever
18 Looper threader Automatic threading by the air pump
19 Air pump Piston pump driven by the motor
Motor: DC 12V
20 Power switch Rocker switch
21 Light LED 5V x 2
22 Motor 100V : 100 to 120W
110/120V : 100 to 120W
220 to 240V : 100 to 130W
23 Foot control No-heat method (semi-conductor control type)
24 Driving system Timing belt drive
25 Machine size 350 mm (W) × 310 mm (D) × 340 mm (H)
26 Machine weight 10 kg
1SPECIFICATIONS
* 1: Only for MO-2500 types
–2 –
Caution: Be sure to turn o the power switch
before opening the looper cover.
2NAME OF EACH COMPONENT
1. Appearance Thread guide support
Open thread guide
■ View with looper cover open
Lower looper thread tension dial
Upper looper thread tension dial
Right needle thread tension dial
Left needle thread tension dial
Thread take-up cover
Stitch length adjustment dial
Dierential feed adjustment dial
Cloth plate
Handwheel
Machine socket
Main Power/Light switch
Looper cover with built in
knife guard
Looper cover opening indent
Thread cutter
Presser foot lifter
Stitch plate
Needle clamp
Upper knife
Presser foot
Automatic needle threader
Thread guide No. 1
Magnet needle tray
Micro-lifter dial *1
Top cover
Spool holder pin
Anti - vibration cone
Foam pad
Thread stand
Upper knife changeover knob
TWA
(Tweak Width Adjustment)
Upper looper
Lower looper
Threading hole
Lower knife
Upper knife xing screw
Cutting width adjusting dial
Selection lever for overlocking
or roll hemming
Air-control pushbutton
Threading changeover
lever
Presser foot pressure
regulating knob
*1: Only for MO-2500 type
Magnet needle tray
Roll hemming thread
tension lever
Knee lifting lever hole
Front cover
Retractable support rod
–3 –
Safety switch
Looper threading
mechanism
Knife
Power PCB
Air pump motor
Motor
2. Inside of the cover
Safety switch
Front face
Rear face
*1: Only for MO-2500 type
Knee lifting mechanism
Knee lifting mechanism
Micro lifting
mechanism *1
Needle threading mechanism
–4 –
❸
1. Removing the top cover
○Remove roll hemming thread tension lever ❶by pulling it out toward you.
○Loosen presser foot pressure regulator knob ❷and remove it.
○Turn micro lifter knob ❸to move it downward until it will go no further. Then, pull it upward until it comes
o.
(When assembling the aforementioned parts, install presser foot pressure regulator knob ❷by turning it
after you have installed the top cover. For the micro lifter knob ❸, adjust rstly so that the at portion of
the shaft faces in the same direction as the at portion of presser foot pressure regulator knob ❷. Then,
t micro lifter knob ❸over the shaft until it will go no further.)
❶
❷
❸
Flat portion of the knob
Flat portion of the shaft
When assembling
3
STANDARD ADJUSTMENT / DISASSEMBLY AND ASSEMBLY
Assembly should be carried out in the reverse order of the disassembly procedure.
–5 –
Rear face
○Remove one screw ❹to remove the thread stand.
○Remove two screws ❺to remove the thread stand base.
○Remove two screws ❻.
○While lifting up the rear side of the top cover, remove it by prying out the claws on the side face (at four
locations on the right and left) with a at-blade screwdriver or the like.
○While lifting up the rear side of the top cover further, remove the top cover from the four claws on the front
face by pushing them in the forward direction.
❹❺
❻
Claws
Claws
Claws (after the top cover is removed)
Claws
–6 –
❶
❷
Cable clip band
Safety switch
❸
Safety switch cable
❹
2. Removing the cloth plate cover
○Remove two screws ❶of the bottom plate.
○Remove one screw ❷from the rear side face of the cloth plate.
○For the cloth plate front and rear parts of which are hinged together, remove two safety switch setscrews
❸and remove the two cable clip bands.
○Remove one setscrew ❹of the cloth plate, small. Remove the cloth plate, small by turning it diagonally
upward.
Bottom face
This manual suits for next models
1
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