JUKI MO-104D User manual
SERVICE MANUAL
MO-114D/104D
2-Needle, 4-Thread Overlock Sewing Machine
MO-114D
MO-104D
Be sure to observe the following to protect against a re, electrical shock, injury or damaged components.
* Be sure to unplug the machine before disassembly, assembly or adjustment of the machine.
* Be sure to use the proper genuine parts when changing any of the machine parts.
CAUTION:
CONTENTS
1. Specications ..................................................................................................1
2. Removing order of covers ..............................................................................2
2-1. Front cover ...................................................................................................................2
2-2. Base plate .....................................................................................................................2
2-3. Rear cover ....................................................................................................................3
2-4. Cloth plate ....................................................................................................................3
3. Installation of throat plate ..............................................................................4
4. Height of needle bar ........................................................................................4
5. Position of feed dog ........................................................................................5
6. Adjusting stroke of main feed dog ................................................................6
7. Adjusting stroke of sub feed dog (MO-114D) ................................................7
8. Height of feed dog ...........................................................................................8
9. Feed dog timing ...............................................................................................8
10. Position of balance weights and cams..........................................................9
11. Projecting amount of upper looper ................................................................9
12. Radius of lower looper ..................................................................................10
13. Adjusting lower looper thread guide lever ..................................................10
14. Adjusting loop lift ..........................................................................................11
15. Timing between upper and lower looper .....................................................12
16. Installation of needle guards ........................................................................13
17. Position of upper looper thread take-up .....................................................13
18. Height and lateral position of presser foot .................................................14
19. Adjusting oating amount of thread tension disk ......................................15
20. Thread tension controller .............................................................................16
21. Position of needle thread take-up ................................................................17
22. Belt tension ....................................................................................................18
23. Position of lower knife ..................................................................................18
24. Engagement of upper knife with lower knife ..............................................19
25. Position of cloth plate ...................................................................................20
26. Adjusting presser foot pressure ..................................................................20
– 1 –
1. Specications
No. Items Description
1 Number of needle and threads 2-needle and 4-thread (with differential feed)
2 Needle 130/705H No. 70/80 (10/12)
3 Overedge width 2-needle, 4-thread : 6 mm
1-needle, 3-thread : 4 mm
Roll hemming : 2 mm
4 Stitch length 1.0 to 4.0 mm (standard : 2.5 mm)
5 Differential feed ratio 1 : 0.5 to 0.7 (standard : 1.2 ± 0.3)
6 Needle bar stroke 27 mm
7 Feed dog height 1.3 mm (standard)
8 Presser foot height 5 mm (standard), 7 mm (two step presser foot)
9 Power consumption 105 W
10 Motor (built-in) Input : 90 W, Output : 42 W (120 V)
Input : 90 W, Output : 44 W (240 V)
11 Light 15 W screw type (120 V)
10 W screw type (240 V)
12 Power switch 2-step rocker switch
13 Sewing speed Max. 1,500 sti/min (SPM)
14 Driving system Timing belt. Machine rotates in the forward (normal) direction
15 Machine size 315 (W) × 290 (D) × 290 (H)
16 Machine weight 7.0 kg
17 Foot control Electronic type
– 2 –
2. Removing order of covers
3
B
2
1
A
2-1. Front cover
○ Remove the setscrews 1(3 locations).
○ Remove the setscrews 2(2 locations).
○ Remove the front cover A.
2-2. Base plate
○ Remove the setscrews 3(4 locations).
○ Remove the base plate B.
– 3 –
6
54
D
C
2-3. Rear cover
○ Remove the setscrews 4(2 locations).
○ Remove the presser foot adjusting screw 5.
○ Raise the presser foot lifting lever 6.
○ Open the cloth plate D.
○ Remove the rear cover C.
7
D
D
<MO-114D>
<MO-104D>
2-4. Cloth plate
○ Remove the setscrews 7(2 locations).
○ Remove the cloth plate D.
– 4 –
3. Installation of throat plate
4. Height of needle bar
[Checking items]
1Throat plate
2Setscrew
3Feed dog
4Center of needle entry
* Check that all needles are laterally equidistant with respect to the nee-
dle slot Ain the throat plate 1.
* Check that the distance between the needle center and the front edge
of the needle slot Ain the throat plate 1is 1.4 mm B.
[How to perform adjustment]
○ Loosen the setscrew 2. Carry out the adjustment by moving the throat
plate 1as described below:
a) The feed dog 3teeth are parallel to the slots in the throat plate 1.
b) The needles are spaced equidistantly with respect to the needle
slot Ain the throat plate 1.
c) The distance between the needle center and the front edge of the
needle slot Ain the throat plate 1is 1.4 mm B.
○ Tighten the setscrews 2.
[Checking items]
1Needle
2Throat plate
* Check that the distance between the top surface of throat plate 2and the
needle 1point with the needle bar at the highest point of its stroke is 10.1 ±
0.15 mm A.
[How to perform adjustment]
○ Loosen the setscrew Bof the needle bar connection Cslightly.
(The needle bar should not slip down.)
○ Turn the handwheel to allow the needle bar Dto reach the highest point of
its stroke.
○ Move needle bar D up and down by hand to adjust dimension Ais obtained.
○ Tighten the setscrew B.
* Check the position of needle entry of the left needle and right needle to the
throat plate 2.
* Check the clearance between the needle 1and the looper, and the clear-
ance between the needle 1and the needle guard.
* The right needle is at the center position of the needle bar, but the left needle
is offset on the left side from the center of the needle bar.
The position of the left needle moves back and forth by turning the needle
bar.
4
B
A
3
2
1
D
C
B
2
1
A
– 5 –
5. Position of feed dog
[Checking items]
1Main feed dog
2Sub feed dog
3Throat plate
* Check that the feed dogs (1and 2) and the slot in the throat plate 3
are parallel with each other.
* The clearances of the right and left side between the feed dogs (1and 2)
and the slot in the throat plate 3are equal.
* Check that the throat plate 3does not come in contact with the main
feed dog 1at the most receded position when the stitch length is 4 mm.
* Check at the most-advanced position in max. main feed and min. sub
feed the clearance between the main feed dog 1and the sub-feed dog
2is 1+0.4
-0.5 mm C.
[How to perform adjustment]
○ Loosen the setscrews Dof the main feed dog 1.
○ Adjust the position of the main feed dog 1so that the throat plate 3
does not come in contact with the main feed dog 1at the most receded
position when the stitch length is 4 mm.
○ Tighten the setscrews D.
○ Loosen the setscrews Eof the sub feed dog.
○ Adjust the position of the sub feed dog 2so that at the most-advanced
position in max. main feed and min. sub feed the clearance between
the main feed dog 1and the sub-feed dog 2is 1+0.4
-0.5 mm C.
○ Tighten the setscrews E.
○ Check that the main feed dog 1and the sub feed dog 2are attached
in parallel.
E
D
3
C
2
B
1
Clearances are equal.
– 6 –
6. Adjusting stroke of main feed dog
[Checking items]
1Feed dog
2Throat plate
* Adjust the stitch length to 1 mm.
* Turn the handwheel to move the feed dog up and down.
Check that the moving amount of feed dog 1is 1.2 ± 0.2
mm Awhen the teeth tip of the feed dog is aligned with the
top surface of throat plate 2during its upward/downward
movement.
[How to perform adjustment]
○ Loosen the setscrews Dof the horizontal feed regulator C.
○ Turn the horizontal feed regulator Cso that the moving
amount of main feed dog 1is 1.2 ± 0.2 mm A.
○ Tighten the setscrews D.
2
1
A
D
C
– 7 –
7. Adjusting stroke of sub feed dog (MO-114D)
[Checking items]
1Main feed dog
2Sub feed dog
3Throat plate
* Adjust the stitch length to 4 mm.
* Set the differential feed ratio at "N".
* Turn the handwheel to move the feed dog up and down. Check that the
difference of clearance (A- A') between the main feed dog 1and the
sub feed dog 2is 0 ± 0.1 mm when the teeth tip of feed dog teeth is
aligned with the top surface of throat plate 3during its upward/down-
ward movement.
[How to perform adjustment]
○ Loosen the setscrew Cof the eccentric stud D.
○ Turn the eccentric stud D to perform adjustment.
○ Tighten the setscrew C.
C
D
2 21 1
A'A
Same line
3
A- A' = 0 ± 0.1 mm
3
AA'
2
1
– 8 –
8. Height of feed dog
9. Feed dog timing
[Checking items]
1Front end of feed dog
* Adjust the stitch length to 2.5 mm. Bring the feed dog to
its highest position. At this time, check that the height of
front end 1of feed dog with respect to the top surface of
the throat plate is 1.3 ± 0.1 mm A.
[How to perform adjustment]
○ Set the feed dog in its highest position.
○ Loosen the setscrew Cof the eccentric stud D.
○ Turn the eccentric stud D to perform adjustment.
○ Tighten the setscrew C.
[Checking items]
1Needle
2Throat plate
3Feed dog
* Adjust the stitch length to 2.5 mm. When the feed dog
3and the needle 1go up, check that the tip of needle
1and the teeth tip of feed dog 3are simultaneously
aligned with the top surface of throat plate 2.
* The position of the needle 1shall be ± 0.2 mm from the
top surface of throat plate 2.
[How to perform adjustment]
○ Loosen the setscrews Aof the feed eccentric cam B.
○ Turn the feed eccentric cam B to perform adjustment.
○ Tighten the setscrews A.
D
C
1
A
3
2
1
B
A
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