JUKI MO-1000 Series Service Manual
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JUKI MO-1000 Series Service Manual

2-needle, 2/3/4-thread overlock sewing machine
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2-needle, 2/3/4-Thread Overlock Sewing Machine
MO-1000 Series
SERVICE Manual
no.00
40138732

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Summary of Contents for JUKI MO-1000 Series

  • Page 1 2-needle, 2/3/4-Thread Overlock Sewing Machine MO-1000 Series SERVICE Manual no.00 40138732...

  • Page 3: Table Of Contents

    COnTEnTS SPECIFICaTIOnS ................1 naME OF EaCH COMPOnEnT ............. 2 1. appearance ....................... 2 2. Inside of the cover ....................3 STanDaRD aDJuSTMEnT / DISaSSEMBlY anD aSSEMBlY... 4 1. Removing order of covers ..................4 2. Installation of the throat plate ................. 8 3.
  • Page 4 26. adjusting the timing of the upper knife ..............56 27. adjusting the thread sliding segment ..............58 28. adjusting the safety switch ................... 60 29. Position of the cloth plate ..................62 CIRCuIT DIaGRaM ............... 64 MaInTEnanCE ................66 1.

  • Page 5: Specifications

    SPECIFICaTIOnS Items Description Model name 2-Needle, 2/3/4-Thread Overlock Sewing Machine (with differential feed adjusting) Stitch choice 2 needles, 4 thread overlock 2 needles, 3 thread overlock 1 needle, 3 thread overlock 1 needle, 2 thread overlock Sewing speed Up to 1,500 sti/min Rating 1,350±150 sti/min Needle gauge Overlocking: 2.2 mm...

  • Page 6: Name Of Each Component

    naME OF EaCH COMPOnEnT 1. appearance Open thread guide Thread guide support lower looper thread tension dial Retractable support rod upper looper thread tension dial Top cover Right needle thread tension dial Spool holder pin left needle thread tension dial anti - vibration cone Presser foot pressure Foam pad...

  • Page 7: Inside Of The Cover

    2. Inside of the cover Front face Safety switch needle threading mechanism looper threading mechanism Safety switch Knife Rear face Power PCB Microprocessor PCB *1 Motor air pump motor – –...

  • Page 8: Standard Adjustment / Disassembly And Assembly

    STanDaRD aDJuSTMEnT / DISaSSEMBlY anD aSSEMBlY 1. Removing order of covers 1-1. The top cover Hole ○ Pushing the arrowed section in the figure by both hands (i.e., removing the projections of the front cover from the holes in the top cover), draw this side upward.
  • Page 9 1-3. The base plate If the sewing machine is tilted away from you, the sewing machine will not be stabilized since the rear cover has a rounded surface. It is recommended to place the sewing machine with the cloth plate down on the table.
  • Page 10 1-5. The front cover ○ Turn the pulley to retract the looper to the position indicated in the figure a . Caution: Be sure to retract the looper without exceptions. Be aware that the 2/3 thread changeover lever can break if the looper is not retracted. ○...
  • Page 11 1-6. looper cover guide ○ Loosen and remove the setscrews 1 . ○ Remove the cover with the knife changeover lever aligned with the position of notch on the cover. 1-7. The cloth plate cover ○ Open the cloth plate. Remove three screws 2 to remove safety switch 1 .

  • Page 12: Installation Of The Throat Plate

    2. Installation of the throat plate 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. Standard adjustment + 0.6 - 0.2...
  • Page 13 adjustment Procedure Results of Improper adjustment Checking items: 　　1 Throat plate 　　2 Setscrew 　　3 Feed dog 　　4 Thread sliding segment * Check that all needles are laterally equidistant with respect to the throat plate slot (A). * Check that the distance between the needle center and the front edge + 0.6 of the throat plate slot is 1.4 mm (B).

  • Page 14: Height Of The Needle Bar

    3. Height of the needle bar 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. Standard adjustment (a) 11.16 ±...
  • Page 15 adjustment Procedure Results of Improper adjustment Checking items: 　　1 Right hand needle 　　2 Throat plate * Check that the distance between the throat plate surface and the OL right hand needle point with the needle bar at the highest point of its stroke is 11.16 ±...

  • Page 16: Position Of The Feed Dog

    4. Position of the feed dog 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. Standard adjustment Interference should be prevented 1 mm...
  • Page 17 adjustment Procedure Results of Improper adjustment Checking items: 　　1 Main feed dog 　　2 Sub feed dog 　　3 Throat plate * Check that the feed dog and the slot in the throat plate 3 are parallel If the clearances on the right side with each other, that the clearances on the right and left side of the and left side of the feed dog are feed dog are equal (A).

  • Page 18: Adjusting The Stroke Of The Sub Feed Dog

    5. adjusting the stroke of the sub feed dog 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. Standard adjustment (a’) (a’)
  • Page 19 adjustment Procedure Results of Improper adjustment Checking items: 　　1 Main feed dog 　　2 Sub feed dog 　　3 Throat plate * Adjust the stitch length to 4 mm. If the difference in the aforemen- * Set the differential feed ratio at "N". tioned clearances deviates from * Turn the handwheel to move the feed dog up and down.

  • Page 20: Height Of The Feed Dog

    6. Height of the feed dog 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. Standard adjustment (a) 1.3 mm –...
  • Page 21 adjustment Procedure Results of Improper adjustment Checking items: 　　1 Front end of feed dog ○ If the sub feed dog height is * Adjust the stitch length to 2.5 mm. Set the differential feed ratio at "N". Bring the sub feed dog to its highest position. At this time, check that larger than the standard ad- the height of foremost section 1 of the sub feed dog with respect to justment value, the needle can...

  • Page 22: Feed Dog Timing

    7. Feed dog timing 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. Standard adjustment alignment –...
  • Page 23 adjustment Procedure Results of Improper adjustment Checking items: 　　1 Right hand needle 　　2 Throat plate 　　3 Sub feed dog * Adjust the stitch length to 2.5 mm. Set the differential feed ratio at "N". If this timing is not properly adjust- When sub feed dog 3 and right needle 1 go up, check that the tip of ed, needle breakage, puckering right needle 1 and tip of the teeth of sub feed dog 3 are simultane-...

  • Page 24: Position Of The Balance Weights And The Cams

    8. Position of the balance weights and the cams 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. Standard adjustment –...
  • Page 25 adjustment Procedure Results of Improper adjustment 　　1 Knife driving cam 　　2 Feed cam 　　3 Lower looper cam 　　4 Upper looper cam 　　5 Needle driving cam ○ Screw No. 1 is tightened in the flat section of the main shaft 　　　　　(the figure below). 　　6 Positioning collar 　　7 Marker on the handwheel ○...

  • Page 26: Projecting Amount Of The Upper Looper

    9. Projecting amount of the upper looper 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. Standard adjustment (a) 6.8 ±...
  • Page 27 adjustment Procedure Results of Improper adjustment Checking items: 　　1 Left hand needle If the standard adjustment value is 　　2 Upper looper exceeded, stitch skipping can be caused. * Check that distance (projecting amount) a from the left end of left hand needle 1 to the blade point of upper looper 2 is 6.8 ±...

  • Page 28: Radius Of The Lower Looper

    10. Radius of the lower looper 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. Standard adjustment –...
  • Page 29 adjustment Procedure Results of Improper adjustment Checking items: 　　1 Lower looper setscrew 　　2 Lower looper shaft 　　3 Lower looper * Check that the distance from the center of the lower looper shaft 2 to the lower blade point is 65.5 ± 0.15 mm (A). How to perform adjustment: ○...

  • Page 30: Adjustment Of The Loop Lift

    11. adjustment of the loop lift 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. Standard adjustment Gauge needle 0 to 0.05 mm...

  • Page 31: Lower Looper

    adjustment Procedure Results of Improper adjustment Checking items: 　　1 Right hand needle 　　2 Lower looper blade point 　　3 Lower looper 　　4 Gauge needle (Cut the top end of needle for use. L = 31.58 mm) * Check that the clearance between the needle 1 and the lower looper If the clearance between the nee- blade point 2 is 0 to 0.05 mm (E).

  • Page 32: Timing Between Upper And Lower Looper

    12. Timing between upper and lower looper 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. Standard adjustment (a) 1 ±...
  • Page 33 adjustment Procedure Results of Improper adjustment Checking items: 　　1 Lower looper 　　2 Upper looper * Check that the clearance between the projecting part of the lower looper 1 and the blade point of the upper looper 2 is 1 ± 0.5 mm (A) when the upper looper goes up and the upper looper blade point meets the lower looper.

  • Page 34: Installation Of The Needle Guards

    13. Installation of the needle guards 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. Standard adjustment –...
  • Page 35 adjustment Procedure Results of Improper adjustment Checking items: 　　1 Throat plate 　　2 Rear movable needle guard 　　3 Front needle guard * Check that the clearance between the needle and the front needle guard and that between the needle and the rear movable needle guard are 0.05 to 0.2 mm (A) and 0 to 0.1 mm (E).

  • Page 36: Adjusting The Looper Thread Take-Up

    14. adjusting the looper thread take-up 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. Standard adjustment –...
  • Page 37 adjustment Procedure Results of Improper adjustment Checking items: 　　1 Looper thread take-up thread guide * The standard position of the looper thread take-up is the center of the slot. How to perform adjustment: ○ Loosen the setscrews (A). ○ Move thread guide 1 to the right and left. ○...

  • Page 38: Height And Lateral Position Of The Presser Foot

    15. Height and lateral position of the presser foot 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. Standard adjustment (a) 4.8 to 5.0 mm The presser foot and the...
  • Page 39 adjustment Procedure Results of Improper adjustment Checking items: 　　1 Throat plate * Raise the presser foot using the lifting lever and check that the dis- If the height of the presser foot is tance between the throat plate surface and the presser foot sole is 4.8 excessively high, the needle thread- to 5.0 mm (A).

  • Page 40: Adjusting The Floating Of The Disk Of The Thread Tension Controller

    16. Adjusting the floating of the disk of the thread tension controller 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. Standard adjustment Clearance: 0.9 mm or more –...
  • Page 41 adjustment Procedure Results of Improper adjustment Checking items: 　　1 Tension release actuating bracket 　　2 Setscrew 　　3 Thread tension adj. knob * Lift the presser foot. Set the thread tension adjustment knob at "4". At this time, check that the lower looper thread tension is released. * Check that a clearance of 0.9 mm or more is provided between the lower looper thread tension disks (clearance between two disks).

  • Page 42: Adjusting The Tension Of The Thread Tension Controller

    17. adjusting the tension of the thread tension controller 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. Standard adjustment To decrease To increase...
  • Page 43 adjustment Procedure Results of Improper adjustment Checking items: 　　1 Thread tension adj. knob 　　2 Thread tension gear * Using Junior Spun thread #90 or FUJIX King Polyester Spun #90, check that the thread tensions are the numeric values shown below. (Scale mark on the knob "4") 　Standard tension table Left-hand...

  • Page 44: Position Of The Needle Thread Take-Up Thread Guide

    18. Position of the needle thread take-up thread guide 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. Standard adjustment 1 to 2 mm –...
  • Page 45 adjustment Procedure Results of Improper adjustment Checking items: * Check that the size of the needle thread loop is 1 to 2 mm (A) when If the needle thread loops are the lower looper blade point meets the needle center when sewing excessively large, the loops will fall two plies of cotton broad cloth with No.

  • Page 46: Tension Of The Belt

    19. Tension of the belt 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. Standard adjustment * The motor comes in three different types according to the destination.
  • Page 47 adjustment Procedure Results of Improper adjustment Checking items: 　　1 Belt When the tension is excessively 　　2 Motor increased, the load applied to the 　　3 Nuts motor is increased to cause reduc- tion in the number of revolutions * Sewing speed: Up to 1,350 ± 150 sti/min and motor heating.

  • Page 48: Adjusting The Needle Bar Connection Guide Of The Needle Threader

    20. adjusting the needle bar connection guide of the needle threader 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. Standard adjustment Clearance 0.3 ±...
  • Page 49 adjustment Procedure Results of Improper adjustment Checking items: 　　1 Needle bar connection guide 　　2 Needle bar connection 　　3 Presser bar connection 　　4 Needle bar connection guide plate 　　5 Needle threader shaft pin * A clearance of 0.3 ± 0.2 mm has to be provided between needle bar connection 2 and needle bar connection guide 1 .

  • Page 50: Adjusting The Needle Threader Hook

    21. adjusting the needle threader hook 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. Standard adjustment needle adjustment of the...
  • Page 51 adjustment Procedure Results of Improper adjustment Checking items: 　　1 Hook * Hook 1 has no vertical/lateral bend. It has to be equidistantly spaced from the right and left guide plates. * Check that hook 1 enters the eyelets in the right and left needles to thread the needles.

  • Page 52: Adjusting The Looper Threader Timing

    22. adjusting the looper threader timing 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. Standard adjustment Recess Insert straightway...
  • Page 53 adjustment Procedure Results of Improper adjustment Checking items: 　　1 Positioning collar 　　2 Positioning collar screw 　　3 Thread inlet bracket 　　4 Thread inlet bracket screw 　　5 Changeover lever 　　6 Positioning shaft How to perform adjustment: Adjustment is to be carried out with the cover removed. It is recom- mended to attach changeover lever 5 to facilitate adjustment.

  • Page 54: Adjusting The Pump Unit

    23. adjusting the pump unit 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. Standard adjustment Toward the ground wire...
  • Page 55 adjustment Procedure Results of Improper adjustment Checking items: 　　1 Motor screw 　　2 Motor gear 　　3 Piston gear 　　4 Cylinder screw 　　5 Cylinder 　　6 Piston lip * The backlash between motor gear 2 and piston gear 3 is approxi- mately 0 to 0.5 mm. * Check to be sure that piston lip 6 and cylinder 5 smoothly slide.

  • Page 56: Position Of The Lower Knife

    24. Position of the lower knife 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. Standard adjustment (a) 0 to 0.3 mm –...
  • Page 57 adjustment Procedure Results of Improper adjustment Checking items: 　　1 Throat plate If the knife juts out from the throat 　　2 Lower knife presser plate plate, the material can be caught by 　　3 Setscrew the jutted section to cause irregular 　　4 Lower knife support plate feed, needle breakage and material 　　5 Setscrew puckering.

  • Page 58: Engagement Of The Upper Knife With The Lower Knife

    25. Engagement of the upper knife with the lower knife 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. Standard adjustment (B) 1 to 1.5 mm –...
  • Page 59 adjustment Procedure Results of Improper adjustment Checking items: 　　1 Upper knife If the depth of mesh of the knives 　　2 Upper knife screw is smaller than the standard adjust- 　　3 Lower knife ment value, material cutting failure can occur. * Check the engagement of the upper knife 1 with the lower knife 3 when the upper knife 1 is in the lowest position.

  • Page 60: Adjusting The Timing Of The Upper Knife

    26. adjusting the timing of the upper knife 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. Standard adjustment Direction of rotation Screw no.
  • Page 61 adjustment Procedure Results of Improper adjustment Checking items: 　　1 Upper knife If the knife timing is not correct, the 　　2 Feed dog material can be fed while the upper 　　3 Throat plate knife is descending to cause puck- ering and irregular feed. * The standard timing is achieved in the case the upper knife is brought to its upper dead point when the feed dog starts coming down.

  • Page 62: Adjusting The Thread Sliding Segment

    27. adjusting the thread sliding segment 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. Standard adjustment (a) 8 mm or more Parallel to the throat plate...
  • Page 63 adjustment Procedure Results of Improper adjustment Checking items: 　　1 Throat plate If the thread sliding segment juts 　　2 Thread sliding segment out of the throat plate, the materi- al or thread can be caught by the * The distance from the throat plate to the tip of the thread sliding seg- jutted section.

  • Page 64: Adjusting The Safety Switch

    28. adjusting the safety switch 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. Standard adjustment (C) when the presser foot is lifted (C) when the presser foot is lowered...
  • Page 65 adjustment Procedure Results of Improper adjustment Checking items: 　　1 Cloth plate safety switch ○ Unexpected operation can oc- 　　2 Presser foot lifter safety switch cur due to a malfunction of the respective switches. * Cloth plate safety switch 1 has to return smoothly when it is pressed. ○...

  • Page 66: Position Of The Cloth Plate

    29. Position of the cloth plate 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. Standard adjustment 0.1 to 2.0 mm 0 to 0.8 mm...
  • Page 67 adjustment Procedure Results of Improper adjustment Checking items: 　　1 Throat plate ○ If there is no clearance between 　　2 Cloth plate the cloth plate and the throat 　　3 Rear cover plate and between the cloth plate and the rear cover, ab- * Check that the clearance between the cloth plate 2 and the throat normal noise can be produced plate 1 is 0 to 0.5 mm (A) and 0 to 0.8 mm (B).

  • Page 68: Circuit Diagram

    CIRCuIT DIaGRaM For the sewing machines for the Japanese market (MO-1000M, MO-1000Ml) – –...
  • Page 69 For the sewing machines for overseas market (MO-1000) – –...

  • Page 70: Maintenance

    If you do not have a grease pump, it is recommended to fill a plastic oiler with grease or to use a syringe with- out a needle. 　・Syringe specifically for grease application JUKI part No.: GDS01007000 3. looper threader Do not lubricate inside the pipe. If the inside of the pipe is contaminated with oil, thread cannot be passed through it.

  • Page 71: Troubles And Corrective Measures

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  • Page 80 TOKYO, 206-8551, JAPAN PHONE : (81)42-357-2341 FAX : (81)42-357-2345 http://www.juki.com Copyright C 2013 JUKI CORPORATION. ＊ The description covered in this Service Manual, Parts list is subject to change for improvement of All rights reserved throughout the world. the commodity without notice.

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