JUKI DDL-8000A Engineer's Manual
  1. Manuals
  2. Brands
  3. JUKI Manuals
  4. Trimmer
  5. DDL-8000A
  6. Engineer's manual

JUKI DDL-8000A Engineer's Manual

Direct-drive, high-speed, automatic thread trimmer
Hide thumbs Also See for DDL-8000A:
Table of Contents

Advertisement

Quick Links

Download this manual
Direct-drive, High-speed, Automatic Thread Trimmer
DDL-8000A
ENGINEER'S MANUAL
40218604
No. E440-00

Advertisement

Table of Contents
loading

Related Manuals for JUKI DDL-8000A

Summary of Contents for JUKI DDL-8000A

  • Page 1 Direct-drive, High-speed, Automatic Thread Trimmer DDL-8000A ENGINEER’S MANUAL 40218604 No. E440-00...
  • Page 2 PREFACE This Engineer’s Manual is written for the technical personnel who are responsible for the service and mainte- nance of the machine. The Instruction Manual for these machines intended for the maintenance personnel and operators at an apparel factory contains operating instruction in detail. And this manual describes “Standard Adjustment”, “Adjustment Procedures”, “Results of Improper Adjustment”, and other important information which are not covered in the Instruction Manual.
  • Page 3 TO ENSURE SAFE USE OF YOUR SEWING MACHINE 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.
  • Page 4 JUKI assumes no responsibility for damages or personal injury or death resulting from the use of the ma- chine for any application other than the intended one.
  • Page 5 1. Be sure to use JUKI genuine table and table stand in order to prevent accident that can result in personal injury or death. If it is inevitable to use a table and table stand which are not JUKI genuine ones, select the table and table stand which are able to support the machine weight and reaction force during operation.
  • Page 6 7. If the machine cannot be normally operated after repair or adjustment, immediately stop operation and contact JUKI or the distributor in your area for repair in order to prevent accident that can result in per- sonal injury or death.
  • Page 7 Replacement of parts 1. In prevention of accident caused by unfamiliarity with the machine or electrical-shock accident, be sure to ask an electrical technician of your company or JUKI or distributor in your area for replacement of electrical components. 2. When it is necessary to open the control box containing electrical parts, be sure to turn the power off and wait for five minutes or more before opening the cover in order to prevent accident caused by un- familiarity with the machine or electrical-shock accident.
  • Page 8 Engineer's Manual and in the Instruction Manual. 2. In prevention of accident caused by unfamiliarity with the machine or electrical-shock accident, be sure to ask an electrical technician of your company or JUKI or distributor in your area for disassembly/as- sembly of electrical components.
  • Page 9 PRECAUTIONS TO BE TAKEN SO AS TO USE THE DDL-8000A SERIES MORE SAFELY 1. Neither open the pulley cover nor touch the parts inside the pulley cover with the power remained on in order to prevent accidents due to electrical shock.
  • Page 10 CAUTION BEFORE OPERATION CAUTION : To avoid malfunction and damage of the machine, confirm the following • Clean the sewing machine thoroughly before using it for the first time. • Remove all dust collected on the sewing machine during the transportation. •...

  • Page 11: Table Of Contents

    CONTENTS 1. Specifications ......................... 1 2. Name of each component ....................3 3. Standard adjustment ...................... 5 (1) Feed dog height and gradient ....................5 (2) Adjusting the needle and the hook ..................7 (3) Setting of feed timing ......................9 1) Standaed adjustment ........................9 2) Feed trace and phase adjustment ....................11 (4) Adjustment of inner hook presser position ...............
  • Page 12 (12) Adjustment of external parts ..................... 63 1) How to remove the control box ....................63 2) Clearance of the hand wheel ......................65 3) Adjustment of the bobbin winder unit ..................67 (13) Replacement of the main motor ..................69 (14) Replacement of the timing belt ..................69 (15) Lubrication mechanism configuration and adjustments ..........
  • Page 13 10. Screws for attachment and positions of external parts ........134 11. Troubles and corrective measures ................. 135 (1) Mechanical components ....................135 (2) Sewing performance ......................149 12. Block diagram ......................158 13. Drawing of table ......................159...

  • Page 14: Specifications

    *2：Stitch length 0.00 to 4.00：4,500sti/min, stitch length 4.05 to 5.00：4,000sti/min *3：JUKI New Defrix Oil No. 1 or JUKI CORPORATION GENUINE OIL.7 (equivalent to ISO VG7) *5：Steady operation denotes the noise level produced when the machine is operated for 300 mm at a constant speed in the state that straight sewing is performed and no other units are actuated.
  • Page 15 *2：Stitch length 0.00 to 4.00：4,500sti/min, stitch length 4.05 to 5.00：4,000sti/min *3：JUKI New Defrix Oil No. 1 or JUKI CORPORATION GENUINE OIL.7 (equivalent to ISO VG7) *5：Steady operation denotes the noise level produced when the machine is operated for 300 mm at a constant speed in the state that straight sewing is performed and no other units are actuated.

  • Page 16: Name Of Each Component

    2. Name of each component ❹ ❾ ❶ ❼ ❷ ❽ ❿ ⓮ ⓭ ❻ ⓯ ⓫ ❸ ⓴ ⓱ ⓬ ⓰ ⓳ ❺ ⓲ ❶ Control box  Reverse feed lever ❷ Operation Panel  Hand wheel ❸ Power switch  Take-up lever cover ❹...
  • Page 17 ❶ Control box The box contains the circuit that controls the head unit and motor, the output circuit that operates each output (the reverse feed solenoid, etc.), the pedal sensor that detects the pedal operation, and the pow- er circuit that performs each function. ❷...

  • Page 18: Standard Adjustment

    (SH-GG) Engraved marker dot position on the horizontal feed bar shaft DDL-8000A*-MS : 0.8mm DDL-8000A*-SH (DDL-8000*-SJ) : 1.2mm Standard feed dog height (Feed dial graduation 0) 0.8mm : DDL-8000A*-MS 1.2mm : DDL-8000A*-SH (DDL-8000A*-SJ) Standard feed dog gradient The engraved marker dot on the feed bar shaft  is adjusted by a feed dog of relevant standard.
  • Page 19 If the height has to be increased ❷ ❷ for an unavoidable reason, the amount of return can be reduced by adjusting the gradient of the Near side Rear side feed dog to raise its tip. Fig. D 0.8mm DDL-8000A*-MS 1.2mm DDL-8000A*-SH (DDL-8000A*-SJ) – 6 –...

  • Page 20: Adjusting The Needle And The Hook

    (2) Adjusting the needle and the hook WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment ❶ 0.04 to 0.1mm ❹...
  • Page 21 About the needle bar Amount Specifications Part No. of looper Needle shank return DDL-8000A*-MS-AA/CC 22886907 1.8mm ø 1.64 DDL-8000A*-MS-BB 22887004 1.8mm ø 2.02 DDL-8000A*-SH 40061767 2.3mm...

  • Page 22: Setting Of Feed Timing

    Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment 1) Standard adjustment Vertical feed cam phase (engraved marker line position) DDL-8000A*-SH DDL-8000A*-MS (DDL-8000A*-SJ) ❷ ❹ ❺...
  • Page 23 * In case of other than the DDL-8000A*-MS, the engraved marker dot  of the pulley cover is matched with the engraved marker dot ...

  • Page 24: Feed Trace And Phase Adjustment

    (3) Setting of feed timing WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment 2) Feed trace and phase adjustment ❷...
  • Page 25 Adjustments can be carried out with two setscrews . Otherwise, there will be adverse torque or unusual sound gener- 1. Timing standard (For DDL-8000A*-MS) ation, or abnormal wear may be The vertical feed shaft engraved marker line  coincides with caused.

  • Page 26: Adjustment Of Inner Hook Presser Position

    (4) Adjustment of inner hook presser position WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment ❶ ❶ ❷ ❷ Height of the presser adjusting screw ❶...
  • Page 27 2. Tighten the nut ❷ after adjustments. * Standard value of the presser adjusting screw height C Height mm Presser Presser Specifications �� Pressure N Pressure kg DDL-8000A*-MS 29.5 39.2 DDL-8000A*-SH 29.5 (DDL-8000A*-SJ) (The presser adjusting screw varies depending on the specification.) – 14 –...

  • Page 28: Bobbin Insertion

    (5) Bobbin insertion WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment 1) Bobbin case with idling prevention spring (Drawing is for 40000264.) Change the height.
  • Page 29 (Made of iron) Bobbin case with idling prevention spring The DDL-8000A Series employs the bobbin case with an idling prevention spring. Adjustments of idling prevention spring tension can be carried out in the procedures below. If bobbin idling occurs, increase the idling prevention spring tension →...

  • Page 30: Adjustment Of Inner Hook Presser Position

    (6) Adjustment of inner hook presser position WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment Inner hook presser position Inner hook ❷...
  • Page 31 Adjustment Procedure Results of Improper Adjustment 1. The front and rear positions of the inner hook presser ❶ can be ○ If the convex section of the inner adjusted by means of the setscrew ❷. hook presser ❶ has any flaw, this can be a cause of thread breakage [Standard adjusting value] or uneven sewing.

  • Page 32: Lubrication

    (7) Lubrication WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment 1) Method of lubrication SH, SJ type (Micro-quantity lubrication) ❶...
  • Page 33 Adjustment Procedure Results of Improper Adjustment 1) Method of lubrication 1. SH, SJ type (Specification for minute-quantity lubrication) Face plate needle bar lubrication : Minute-quantity lubrication by the oil wick ❶. Hook ❷ Forced lubrication by the plunger pump ❸ Quantity of oil can be adjusted by the hook oil adjusting screw ❹.

  • Page 34: Method Of Lubrication To The Oil Tank

    (7) Lubrication WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment 2) Method of lubrication to the oil tank ❶ 3) Method of oil drainage from the oil tank ❺...
  • Page 35 2,000 sti/min or less. 2. For the oil for hook lubrication, purchase JUKI NEW DEFRIX OIL No. 1 (part number : 40214221/ MDFRX1600C0), or JUKI CORPORATION GENUINE OIL 7 (part number : 40102087).

  • Page 36: Cleaning Of The Oil Filter

    (7) Lubrication WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment 4) Cleaning of the oil filter ❶ – 23 –...
  • Page 37 Adjustment Procedure Results of Improper Adjustment 4) Cleaning of the oil filter ○ If there is clogging in the oil filter ❶, Clean the oil filter ❷ periodically (approximately once every three smooth lubrication cannot be main- months). tained from the lubrication hole. 1.

  • Page 38: Adjusting The Amount Of Oil In The Hook

    Oil quantity (large) Oil sprinkles from the hook Oil sprinkles from the hook • 8000A*-MS : 1 to 1.5mm • DDL-8000A*-MS : 0.5 to 1mm • 8000A*-SH (SJ) : 2 to 4mm • DDL-8000A*-SH (SJ) : 1 to 3mm – 25 –...
  • Page 39 (turn counterclockwise) to decrease it. (Caution) ○ When you use an dry hook, buy [When using RP hook (hook for dry head) for DDL-8000A*-MS type] and mount the hook driving shaft 1. Remove hook driving shaft oil wick setscrew ❷ and stopper screw ❺...

  • Page 40: Adjustment Of The Origin Of A Presser Lifter Motor

    (8) Adjustment of the origin of a presser lifter motor WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment ❶ 0.3 mm feeler ❷...
  • Page 41 Adjustment Procedure ① Assembly 1. Remove the face plate, and insert the 3mm feeler between the presser bar position bracket ❶ and lifting plate ❷. 2. Securely tighten three presser motor asm. setscrews  while bringing cam roller ⓮ and cam  into light contact with each other.
  • Page 42 Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment （ Reference) Operating specification of DDL-8000A presser motor <Operating position of presser motor> Presser foot 2nd step lifting position Height from throat plate Height from throat plate  ...
  • Page 43 Adjustment Procedure <Timing of origin search operation> After the power is turned on, conduct origin search and move it to the presser foot 1st step lifting position or presser foot 2nd step lifting position when depressing the back part of the pedal to the 1st or 2nd step the first time.

  • Page 44: Adjustment Of The Amount Of Feeding

    (9) Adjustment of the amount of feeding WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment 1) Adjustment of forward feed stitch length 2) Reverse feed stitch length check (manual) ❶...
  • Page 45 Adjustment Procedure Results of Improper Adjustment * Figures on the graduations are indicated in the unit of mm. 1) Adjustment of forward feed stitch length 1. Turn the feed adjust dial ❶ in the direction of the arrow so that the required figure is adjusted to the engraved marker dot ��...

  • Page 46: Adjustment Of Normal/Reverse Stitching

    (9) Adjustment of the amount of feeding WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment 4) Adjustment of normal/reverse stitching ❶...
  • Page 47 Adjustment Procedure Results of Improper Adjustment 4) Adjustment of normal/reverse stitching 1. Pinch a piece of paper beneath the presser hardware and set the feed dial graduation at 3. ○ The chamfered section ❸ of the 2. Remove the window plate (6 pcs.) of the sewing machine. feed adjusting pin ❷...

  • Page 48: Adjustment Of Ffeed Dial Section

    (9) Adjustment of the amount of feeding WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment 6) Adjustment of the feed dial section Part Configuration Diagram of the feed dial mechanism (Type II) ❷...
  • Page 49 ❶ and mount the O ring ❷ in the groove section. Information about the appropriate grease (Optional item) Part name Part No. JUKI grease A 40006323 2. Set the feed adjust dial ❼ and the feed adjust screw ❶ ogether, and join them with the feed dial screw ❽ .

  • Page 50: Installation Of The Reverse Feed Arm And The Reverse Feed Solenoid

    (9) Adjustment of the amount of feedin WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment 7) Installation of the reverse feed arm and the reverse feed solenoid ❷...
  • Page 51 Adjustment Procedure Results of Improper Adjustment 7) Installation of the reverse feed arm and the reverse feed solenoid 1. Attach the washer ❶ and the rubber seat ❷ to the reverse feed solenoid plunger in this order. 2. Install the reverse feed solenoid and temporarily fasten it with three each of setscrews ❸...

  • Page 52: Adjusting The Needle Thread Presser Device

    (10) Adjusting the needle thread presser device WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment 1) Needle thread presser device ❶...
  • Page 53 Adjustment Procedure 1) Needle thread presser device [Feature] Same as the conventional wiper device, it can tuck the needle thread on the back side of the material. • Operability around the needle entry point is improved. • Applicability of various kinds of attachments designed for use around the needle entry point is improved. ①...

  • Page 54: Adjusting The Remaining Length Of Needle Thread

    (10) Adjusting the needle thread presser device WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment 2) Adjusting the remaining length of needle thread ❷...
  • Page 55 Adjustment Procedure 2) Adjusting the remaining length of needle thread Adjust the length of needle thread remaining at the needle by turning thread tension No. 1 nut ❷. Turn thread tension No. 1 nut ❷ clockwise (in direction A), to shorten the thread length remaining on the needle after thread trimming or counterclockwise (in direction B), to lengthen the thread length.

  • Page 56: Response To Problems Occurring At The Beginning Of Sewing

    (10) Adjusting the needle thread presser device WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment 4) Response to problems occurring at the beginning of sewing ❹...
  • Page 57 Adjustment Procedure Results of Improper Adjustment 4) Response to problems occurring at the beginning of sewing ○ In the case needle thread breakage occurs when using a thin thread or fragile thread ○ In the case needle thread is not tucked on the wrong side of ma- ○ If the automatic presser lifter ❹ terial is not used, set the presser foot ○ In the case needle thread breakage occurs when starting sewing pressure to a lower level to make from the material end (such as sewing the material with needle it easier for the thread between thread tucked on the undersurface of material)

  • Page 58: Adjusting The Thread Trimming Unit

    (11) Adjusting the thread trimming unit WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment 1) Adjustment of the thread trimming cam position ❺...
  • Page 59 (Caution) After adjustment, make confirmation according to [3.-(11)-3) Standard timing for the thread trimming cam]. 4. Apply exclusive grease (JUKI grease A) to the stopper spring part ❺. 2) Adjustment of the thread trimming link stopper screw 1. Turn the hand wheel and adjust the thread trimming roller ❾ to the inlet section G of the thread trimming cam groove.

  • Page 60: Thread Trimming Cam Timing

    (11) Adjusting the thread trimming unit WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment 3) Thread trimming cam timing ❻...
  • Page 61 Adjustment Procedure Results of Improper Adjustment 3) Thread trimming cam timing The aim of the thread trimming cam timing is matching the en- ○ In the case of using a high-count graved line A of the control box with the colorless engraved line on filament thread, thread loop for- the hard wheel ❻...
  • Page 62 (11) Adjusting the thread trimming unit WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment 4) Adjusting the knife unit [1] For checking the knife unit ❶...
  • Page 63 Adjustment Procedure Results of Improper Adjustment 4) Adjusting the knife unit ○ Be aware that, if the distance be- [1] For checking the knife unit tween loop spreading knife ❶ and 1. Check to make sure that the power switch is in the OFF state. center of needle A is reduced, Remove the gauge (presser foot, throat plate and feed dog) from thread loop is likely to interfere with around the needle.

  • Page 64: Adjusting The Knife Unit

    (11) Adjusting the thread trimming unit WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment 4) Adjusting the knife unit Adjustment of the knife unit ❹...
  • Page 65 Adjustment Procedure Results of Improper Adjustment 4) Adjusting the knife unit Adjustment of the knife unit 1. Check to make sure that the power switch is in the OFF state. Remove the gauge (presser foot, throat plate and feed dog) from around the needle.

  • Page 66: Adjustment Of Rise Of The Second Thread Tension Disc

    (11) Adjusting the thread trimming unit WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment 6) Adjustment of rise of the second thread tension disc 1.0 to 1.5 mm ❹...
  • Page 67 Adjustment Procedure Results of Improper Adjustment 6) Adjustment of rise of the second thread tension disc 1. How to check the amount of rise of the second thread tension disc ○ If the amount of rise of the second 1. Set the thread take-up lever slightly in front of the upper thread tension disc ❹...

  • Page 68: Adjustment Of The Driver Part Stopper

    (11) Adjusting the thread trimming unit WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment 7) Adjustment of the driven part stopper ❸...
  • Page 69 Adjustment Procedure Results of Improper Adjustment 7) Adjustment of the driven part stopper The driven part stopper ❷ is a safety device so that interference is prevented between the needle and the moving knife even though the roller comes off the thread trimming cam when any unexpected problem (such as a service interruption) occurs.

  • Page 70: Replacement Of The Knife Unit

    No. 4 No. 6 No. 1 ❶ ❷ ❺ ❸ Ⓐ Ⓐ ❹ No. 5 Knife unit ❶ Handling device knife ❷ Thread trimmer knife ❸ Part No Part No. Part No. DDL-8000A*-MS, SH, SJ 40211087 40195289 40195552 – 57 –...
  • Page 71 Adjustment Procedure Results of Improper Adjustment 8) Replacement of the knife unit [Method of replacement] 1. Let the sewing machine fall down. 2. Remove the needle, hook, and the inner hook presser. 3. Remove the moving knife link stepped screw ❹. * Apply the LOCKTITE 243 on a screw at the time of recombination.

  • Page 72: Installed Of Thread Tspreading Plate

    (11) Adjusting the thread trimming unit WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment 9) Installation of thread spreading plate ❷...
  • Page 73 Adjustment Procedure Results of Improper Adjustment 9) Installation of thread spreading plate ○ If the clearance is too small, the hook ❻ interferes with the thread 1. Set the thread spreader ❶ to fit the groove on machine bed in spreader ❶. As a result, noise and the direction of the figure, temporarily fix it using the setscrew scratching to the hook may occur. ❷.

  • Page 74: Installed Length Of The Thread Trimmer Connector Bar (Asm.)

    ❼ ❽ ❽ Connecting rod (asm.) Connecting rod (asm.) Part No. dimension DDL-8000A*-MS, SH, SJ 40174323 102±0.2mm 11) Installation position of the thread trimming shaft Thread trimming shaft The edge of the thread trimming shaft is matched with the edge of the bed.
  • Page 75 Adjustment Procedure Results of Improper Adjustment 10) Installed length of the thread trimmer connector ○ If the two rod ends ❽ are not bar (asm.) crossed at right angles, the ob- 1. Two connecting sections ❽ of the thread cutter connector rod tained torque is the value for thread are movable.

  • Page 76: Adjustment Of External Parts

    (12) Adjustment of external parts WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment 1) How to remove the control box ❶...
  • Page 77 Adjustment Procedure Results of Improper Adjustment 1) How to remove the control box 1. Remove all the setscrews ❶ from the rear cover. 2. Remove all the connectors connected to the control box. 3. Remove the earth cable connected to the head. * If the screwdriver tip is not inserted fully in the slot, the flange part of the upper sprocket is deformed or destroyed.

  • Page 78: Clearance Of The Hand Wheel

    (12) Adjustment of external parts WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment 2) Clearance of the hand wheel ❸...
  • Page 79 Adjustment Procedure Results of Improper Adjustment 2) Clearance of the hand wheel ○ If a clearance is too much, this can 1. The clearance between the hand wheel ❶ and control box is 1 mm. be a possible cause of entangle- For adjustments, loosen the hand wheel setscrews ❹ (2 pcs.) ment of the thread from the thread stand.

  • Page 80: Adjustment Of The Bobbin Winder Unit

    Adjustment of external parts (12) WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment 3) Adjustment of the bobbin winder unit ❻...
  • Page 81 Adjustment Procedure Results of Improper Adjustment 3) Adjustment of the bobbin winder unit In regard to adjustments of the bobbin winder amount and winder imbalance, refer to the relevant instruction manual. In this manual, descriptions are provided in regard to problems of winder shaft revolution errors. 1. Replacement of the bobbin friction wheel 1. Remove two bobbin winder unit setscrews ❶. 2.

  • Page 82: Replacement Of The Main Motor

    (13) Replacement of the main motor WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment ❸ Hand wheel ❶ ❹ (Second screw) ❺...
  • Page 83 Adjustment Procedure Results of Improper Adjustment The following is the method of replacement when the motor ❶ is out of order. 1. Remove the second setscrew ❷ of the hand wheel. (4mm hexag- onal) 2. Remove the first setscrew ❸ (flat section) of the hand wheel. (4mm hexagonal) 3. Remove the control box. Refer to “3.-(12)-1) How to remove the control box”.

  • Page 84: Lubrication Mechanism Configuration And Adjustments

    (15) Lubrication mechanism configuration and adjustments WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment 1) Configuration ❺ ❹ ❼ ❸...
  • Page 85 Adjustment Procedure Results of Improper Adjustment 1) Configuration • Oil quantity sensor The oil quantity sensor ❹ that detects the oil amount is installed inside the oil tank. Refer to "3.-(15)-2) Procedure of attaching and detaching" for how to replace the oil quantity sensor. –...

  • Page 86: Procedure Of Ataaching And Detaching

    (15) Configuration and adjustment of the lubrication mechanism WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment 2) Procedure of attaching and detaching ①...
  • Page 87 (15) Configuration and adjustment of the lubrication mechanism WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment ③ Remove the nut ❹ from the oil quantity sensor and the oil tank lid ❺ , and then remove the oil quantity sensor.

  • Page 88: How To Remove A Panel

    (16) How to remove a panel WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. 1. Remove the rear cover (six setscrews ❶ of the cover).
  • Page 89 4. Pull out the panel ❺ short. ❺ 5. Remove the panel cable clamp screw ❻, remove the cable connector ❼, and replace the panel ❺. ❻ ❼ 6. After replacement of the panel, reassemble it ac- cording to the opposite procedure. (Caution) Pull the panel cable ❸.If it is loose, it may interfere with the upper shaft and the like.
  • Page 90 (When a cable clip band is not available right now) 1. Pull out the panel cable not to it in the arm. Do not slack the cable. 2. Lay the redundant part of the cable under the cable coming out from the panel. Lay the cable under this cable.
  • Page 91 – 78 –...

  • Page 92: Adjustment Of Thrust Values Of An Upper Shaft

    (17) Adjustment of thrust values of an upper shaft WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment ❶ ❷ –...
  • Page 93 Adjustment Procedure Results of Improper Adjustment After everything has been installed for the upper shaft, remove rattles from bearings (pressurizing). 1. Assemble all parts for the upper shaft. 2. Loosen two setscrews ❶ of the upper sprocket. 3. Enter the tip of a tapered minus screwdriver into the coupling ❷ slot until it stops. (Part A) * If the screwdriver tip is not inserted fully in the slot, the flange part of the upper sprocket is deformed or destroyed.

  • Page 94: Operation Panel

    4 . Operation panel (1) Function of panel key ❼ -B ❼ -A ❻ -A ⓬ ⓫ ❻ -B ❽ ❹ ❶ ❷ ❸ ❺ ❾ ❿ ⓭ How long the key Function must be pressed Short time Used to changing over the automatic reverse feed stitching at the beginning of sewing to: Reverse feed stitching / Double reverse feed stitching / Disable ❶...
  • Page 95 How long the key Function must be pressed Used to set the number of reverse feed stitches (ABCD) at the Short time beginning and end of sewing Used to change over the one-shot operation between enable / Long time disable ❼...

  • Page 96: Function Setting

    (2) Function setting The set value of the function setting can be changed. [1] User level The function setting screen is displayed ❻ ❼ by keeping ⓬ held pressed for three seconds in the normal sewing state. ⓬ A indicates the function setting number. ❽...

  • Page 97: Head Selection (Memory Switch No. P70)

    (3) Head selection (Memory switch No. P70) 1） Activate the memory switch in the user level. ❻ ❼ (Refer to "4.-(2)-[1] User level".) 2） Press ❼ to make the pressing function ⓬ setting No. A blink, and press ❻ to ❽...

  • Page 98: Passworf Lock (Memory Switch No. 14)

    (5) Password lock (Memory switch No. 14) Activate the memory switch in the service level. ❻ ❼ (Refer to "4.-(2)-[2] Service level".) Press ❼ to make the pressing ⓬ setting No. A blink, and press ❻ to ❽ select "J14". Press ❼...

  • Page 99: Monitor Function

    (6) Monitor function ① The software version can be viewed with N01, N02, and N14 ② Each part of the sewing machine during operation can be monitored with N03, N04, N05, N06, and N07. ③ Operation restrictions by grease-up error can be canceled with N15. ④...
  • Page 100 [3]-1 How to reset the grease shortage error Activate the memory switch in the service level. ❻ (Refer to "4.-(2)-[2] Service level".) ⓬ Press ❻ in the state that the function setting No. (A) is blinking to select "N15". The value displayed on the grease-up errorcounter can be viewed.

  • Page 101: List Key Input Functions At Power-On

    (7) List of key input functions at power-on Turning on the power while the panel switch on the front is pressed allows each function to be set. Function Memory switch Service level Password clear Panel software rewrite (Only 8000AS/AB) – 88 –...

  • Page 102: Function Setting List

    Function setting list (1) Function setting list Table 1. Setting Item Description Setting range Default levle P01 Maximum sewing The maximum sewing speed reached by fully depressing the pedal is set with speed this function setting item. The maximum sewing speed can be changed within 100 to [P68] MS : 4000 the sewing speed range specified for [P68 Maximum sewing speed].
  • Page 103 Setting Item Description Setting range Default levle P23 Position to lift the The position to lift the presser foot by operating the pedal is set with this 30 to 1000 presser foot by function setting item. (–) pedal P24 Position to perform The position to perform thread trimming by operating the pedal is set with this 30 to 500 thread trimming by...
  • Page 104 Setting Item Description Setting range Default levle P70 Machine head Machine head type is selected with this function setting item. selection 2 : DDL-8000APMS (Initialization of data) 3 : DDL-8000APSH 2 to 3 ★ Select an applicable head and press the enter switch, and all the P (–) and J data except "P72", "P73", "P123"...
  • Page 105 Setting Item Description Setting range Default levle P129 Number of The number of condensation stitches at the end of sewing is set with this condensation function setting item. 0 to 5 stitches at the end of (stitches) sewing P130 Condensation The sewing speed for condensation stitching at the end of sewing is set with 100 to 1900 stitching speed at...
  • Page 106 Setting Item Description Setting range Default levle * P150 REVERSE signal off Time from the BT SW being turned off to reverse signal being stopped 2 to 500 time (ms) P151 ON/OFF of the bird's (Bird's nest) 0 to 1 nest preventing ON/OFF of the bird's nest preventing operation is set with this function setting (–)
  • Page 107 Table 2 Panel function setting items Setting Item Description Setting range Default level J04 Voice language Selects a voice language. 1 to 2 selection 1 : Chinese (–) 2 : English J05 Voice ON/OFF Selects the voice guidance ON or OFF. 0 : All voice guidance OFF 0 to 2 1 : Only panel operation guidance...

  • Page 108: Further Information Aboout Memory Switch

    (2) Further information about memory switch ① Selection of the soft-start function (Function setting P07, P08) The needle thread may fail to interlace with the bobbin thread at the start of sewing when the stitching pitch (stitch length) is small or a thick needle is used. To solve such problem, this function (called “soft-start”) is used to limit the sewing speed, thereby assuring successful formation of the starting stitches.
  • Page 109 ④ How to balance stitches for [Start Back-Tacking] (Function setting Nos. P18, P19) Example) Step 1: Setting stitch number for Start Back-Tacking A and B = 3 Step 2: Sewing the pattern in normal speed. Step 3: If unbalanced situation is appeared please correct it as below: Suggestion: Select the balance stitches for Section A before selecting for B.
  • Page 110 ⑤ How to balance stitches for [End Back-Tacking] (Function setting Nos. P25, P26, P27) Example) Step 1: Setting stitch number for Start Back-Tacking C and D = 3 Step 2: Sewing the pattern in normal speed. Step 3: If unbalanced situation is appeared please correct it as below: Suggestion: Select the balance stitches for Section C before selecting for D.
  • Page 111 ⑥ How to balance stitches for [Bar Tacking] (Function setting Nos. P32, P33) Example) Step 1: Setting stitch number for Bar-Tacking A = B = 4 and turns of Bar-Tacking D = 4 Step 2: Sewing the pattern in normal speed. Step 3: If unbalanced situation is appeared please correct it as below: Start point Case 1 : Longer A and shorter B...
  • Page 112 ⑧ Setting of max. sewing speed (Function setting No. P68) This function can set the max. sewing speed you desire to use. Upper limit of the set value varies in accordance with the sewing machine head to be connected. P 6 8 Setting range : 100 to MAX.
  • Page 113 ⑫ Function of reverse feed stitching on the way (Function setting Nos. P139 to P143) Functions of the limit of number of stitches and thread trimming command can be added to the touch back switch on the sewing machine head. Function setting P139 Function of reverse feed stitching on the way is selected.
  • Page 114 ⑬ Soft start ⑭ Thread presser ⑮ Presser lifter Pedal indication 300 degrees P07 : Soft start speed Sewing speed (sti/min) 300 degrees 100 degrees Sewing P08 : Number of stitches by soft start start point 340 degrees 190 degrees Soft start P163 : Thread presser soft start end angle (340 degrees) P166 : Duty switching time (7 ms)
  • Page 115 ⑯ 8000A BT solenoid impact absorbing The initial value of the memory switch is set so that the lower impact sound of touch back is lowered with stitching pitch of 2 to 4 mm at the time of shipment. If the impact sound at touch back is large, change in the braking timing and Duty described below can reduce the impact sound.

  • Page 116: List Of Error Code

    (3) List of error code Error Description How to correct number E001 High-voltage error (320 V or more) Turn the power OFF. Check the supply voltage. E002 Low-voltage error (170 V or less) Turn the power OFF. Check the supply voltage. Turn the power OFF.
  • Page 117 – 104 –...

  • Page 118: Electrical Component And The Like

    Connector Item Remark 1 Suction solenoid valve (+) Fastening claw 2 Suction solenoid valve (–) 3 Thread hauling solenoid valve (+) 4 Thread hauling solenoid valve (–) Needle thread holdingsolenoid valve (+) JUKI part No.: HK034640000 HK034610100 Needle thread Part name Pin contact Housing holdingsolenoid valve (–) Manufacturer Molex Inc Molex Inc 7 Thread presser solenoid (+) Standard Model name of...

  • Page 119: Panel

    (2) Panel ❼ ❷ ❸ ❺ ❶ ❹ ❻ Table 3 Panel input/output connector arrangement Connector Name of the destination to connect Remark ❶ Main I/F Membrane switch ❷ J2_1 Audio software rewrite ❸ ❹ Panel software rewrite ❺ Audio speaker ❻...

  • Page 120: Maintenance

    7. Maintenance Oil quantity check (2) Cleaning WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment (1) Oil quantity check ❷...
  • Page 121 Adjustment Procedure Results of Improper Adjustment For your long usage, the following routines (checks and mainte- nance) are recommended: (1) Oil quantity check 1. When the power is turned on, use the product in the state that the oil maximum amount warning and oil amount running out warning are not displayed.

  • Page 122: Application Of Appropriate Grease

    1) Grease-up warning and grease-up error 2) Needle bar lower bushing and presser bar bushing ❶ ❷ ❸ Description Part No. Remark JUKI GREASE A TUBE ❶ 40006323 Capacity: 10 g (Appropriate grease) JUKI GREASE A 23640204 Capacity: 100 g ❶...
  • Page 123 Remove presser bar bushing greasing screw ❷ and needle bar lower bushing greasing screw ❸ (only for the DDL-8000A*-MS) with a hexagonal wrench. Remove the cap of JUKI GREASE A TUBE ❶. Insert its tip into the oil hole and replenish grease from exclusive JUKI GREASE A ❶.

  • Page 124: Feed Bar Mechanism

    (3) Application of appropriate grease WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment 3) Feed bar mechanism Loosen the setscrew and screw in and pull the M4 screw. ❷...
  • Page 125 3. Also feed the appropriate grease to the bearing ❸ of the vertical feed cam interior. 4. At the time of reassembly after the disassembly of various parts, apply JUKI GREASE A to the sliding surfaces of the feed bar mechanism. – 112 –...

  • Page 126: Face Plate Mechanism

    Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment 4） Face plate mechanism ❶ ❷ ❸ Section where the JUKI GREASE A is applied Exclusive greasing point Slide portion between arm guide and roller [DDL-8000A*-SH, SJ] ❹...
  • Page 127 ❶ and armʼs sliding groove section. presser bar bushing ❸ and the material cloth may be stained. [DDL-8000A*-SH, SJ] This can be a cause of seizure 3. Confirm that the needle bar ❺ keeps an exact contact with ○...

  • Page 128: Inside A Gear Box

    Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment 5) Inside a gear box Apply exclusive JUKI GREASE A to the whole mechanical section. – 115 –...
  • Page 129 5) Inside a gear box It is prohibited to use oil for the mechanism element inside a gear box because of special surface treatment and a JUKI GREASE A lubrication. 1. Apply grease to the mechanism element inside a gear box.

  • Page 130: Thread Take-Up Lever Mechanism

    Standard adjustment ❽ ❼ ❾ ❼ ❹ ❺ ❻ ❺ ❸ ❷ ❶ Info about the appropriate grease Part name Part No. Remark 40006323 Capacity: 10 g JUKI grease A 23640204 Capacity: 100 g – 117 –...
  • Page 131 Adjustment Procedure Results of Improper Adjustment (Important) No lubrication is needed for the thread take-up lever. (Maintenance-free mechanism) When adjusting the thread take-up lever mechanism, the following items shall be observed: [Replacement of thread take-up lever] 1. Remove the needle bar ❶ and the needle bar connector ❷. 2.

  • Page 132: Initialize

    (5) Initialize All the data (including the set data for F1 and F2 of the panel and polygonal-shape stitching data) other than P72, P73, P123, J4 will be initialized. 1) Activate the memory switch No. P70. (Refer to "4.-(3) Head selection" [Memory switch No. P70].) 2) Select a different head and select the head again.

  • Page 133: Optional

    8. Optional (1) Optional list Part name S-MS S-SH B-MS B-SH (SJ) Remarks Minute presser lifting ○ ○ ○ ○ Ultrashort remain ○ ○ (three teeth, four teeth Knee lifting device ○ ○ ○ ○ Condensation sewing ○ ○ device (2) Optional part number Part name Type...
  • Page 134 Part name Type Part No. Remarks ③ Knee lifting device KNEEL_ 40217286 LIFTER_ASM (Optional assembly) ④ Condensation sewing device CONDENSE_ 40216235 B-MS, SH, and SJ are STITCH_ installed as standard items. DEVICE – 121 –...

  • Page 135: Optional Mounting

    (3) Optional mounting Ultrashort remain kit The optional ultrashort remain set can be used for shortening the remaining thread under the cloth by pinching a spacer between the knife and the knife base and bringing the trim position closer to the under cloth. Accordingly, the knife comes closer to the throat plate and the feed dog, and in the case of the standard knife and the standard feed dog, they interfere with the knife.
  • Page 136 6) Set the thread spreading knife spacer ❺ between the knife mount ❻ and the thread spreading knife ❹ . 6) Set the thread spreading knife spacer ❺ between the knife mount ❻ and the thread spreading knife ❹ . ❺...
  • Page 137 (Continued from the previous page) Tighten the setscrews ❶ ’ (2 pcs.). [2] Assembly check 1) Check if the centerpiece of the thread spreading knife and the center of the thread trimmer knife are matched. If not, loosen the setscrew and adjust the position of the knife. 2) Make sure that the thread trimming can be performed normally.
  • Page 138 ① Set two threads in parallel to the centerpiece of the thread spreading knife, and move the thread trimmer knife to check the sharpness. How to adjust the thread trimmer knife when the thread could not be trimmed ○ Both two threads cannot be cut •...
  • Page 139 ② Check the pressure of two knives. Make sure that the thread trimmer knife does not make strong contact against the thread (How to measure the knife pressure) spreading knife in front of the centerpiece of Match the knives, and hook the a spring the thread spreading knife (read framed part). balance to the knife base and pull the threads while holding the knife units by hand so that they do not move in the axial...

  • Page 140: Condensation Sewing Device

    1) Install condensation arm return spring ❾ to condensation arm ❽ according to the orientation ❽ shown in the figure. 2) Apply JUKI Grease A to the boss section (the section that comes in contact with the spring) of condensation arm ❽ and both ends of spring. ❾ ③ Subassembling the condensation stopper eccentric pin 1) Pass condensation stopper shaft ⓬...
  • Page 141 ④ Subassembling the solenoid plunger pin 1) Apply JUKI Grease A to the shaft section A of Place the chamfered section plunger pin ❻ . outside 2) Holding the plunger while turning its forked section to the left and its notch upward, pass ❼...
  • Page 142 ⑤ Installing the feed adjustment pin 1) Reversing the removal procedure, install the feed adjustment pin. 2) Carry out adjustment of the forward / reverse feed alignment, etc. where appropriate. 3) Apply JUKI Grease A to the sliding surfaces. ⑥ Setting up the condensation plunger 1) Apply JUKI Grease A to the sliding surfaces of condensation arm ❽ and hinge screw ❿ , and the contact surfaces of the spring and condensation Solenoid plunger arm ❽ .
  • Page 143 ⑦ Assembling the condensation solenoid 1） Temporarily secure solenoid mounting plate ❷ to the arm with M5 pan head screw, short ❸ . 2) Temporarily secure sub-assembled condensation solenoid to the arm with M6 pan head screw ⓴ and washer, large  . Then, temporarily secure the condensation solenoid to solenoid mounting plate ❷ which has been temporarily fixed in the aforementioned step 1) with M5 pan head screw, long ❹...
  • Page 144 3) Keeping the state as described in 2), turn conden- sation stopper shaft ⓬ until condensation stopper ⓫ comes in light contact with conden- sation arm ❽ . Light contact (Caution) Take care not to allow condensation arm ❽ to move when condensation stopper ⓫...
  • Page 145 ⑨ Attaching the motor cable guide 1) Secure the motor cable guide on the condensation Condensation solenoid cord Cable guide solenoid cord. Then, pass the cord from below upward, on the far side of the motor cable guide. Then, pull the cord toward the near side. ⑩ Connecting the cord Insert the condensation solenoid pins into the optional connecter of the thread clamp solenoid, as shown in the figure.

  • Page 146: Dry Hook

    9. Dry hook WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Adjustment Procedure Results of Improper Adjustment (1) Cautions when a dry hook is used For the dry hook (RP hook), lubrication is given to the hook race with the use of a specific material.

  • Page 147: Screws For Attachment And Positions Of External Parts

    10. Screws for attachment and positions of external parts WARNING : Be sure to turn the power OFF before the following work in order to prevent personal injury due to unintentional starting of the sewing machine. Standard adjustment 283.5 283.5 13.5 13.5 2 x M4...

  • Page 148: Troubles And Corrective Measures

    11. Troubles and corrective measures (1) Mechanical components Trouble Cause (1) Cause (2) Check and corrective measures 1. Skipping of one or more 1-1) The needle thread pass- 1-A) Something is wrong with the needle Check needle thread routing, thread entangled on stitches occurs at the start ing through the needle threat route and the needle thread...
  • Page 149 Trouble Cause (1) Cause (2) Check and corrective measures From the previous page From the previous page 1-G) The knife thread guide, moving knife, Check whether the hole portion of the hook (especially or hook has a flaw. the blade top) or knife thread guide has a flaw. If there is a flaw there, buff the flaw portion sufficiently.
  • Page 150 Trouble Cause (1) Cause (2) Check and corrective measures From the previous page 1-5) Knot tying between 5-A) The sewing speed at sewing start is Conduct 1 or 2 stitches of soft-start (800 sti/min) at the the needle and bobbin too fast to knot the needle and bobbin sewing start.
  • Page 151 Trouble Cause (1) Cause (2) Check and corrective measures From the previous page 2-3) The needle thread slips 3-A) Too early cam timing or too late hook Slipping of the needle thread from the needle immedi- off the needle immediate- timing causes the moving knife to cut ately after thread trimming results from cutting the nee- ly after thread trimming.
  • Page 152 Trouble Cause (1) Cause (2) Check and corrective measures From the previous page 4-2) The blade portion of the 2-A) The blade portions of the moving Remove the throat plate, and Sharpen the knife is blunt. and counter knives are not per- feat- manually operate the thread counter knife.
  • Page 153 (2) Sewing performance Trouble Cause (1) Cause (2) Check and corrective measures 1. Puckering 1-1) The needle is too thick. 1-A) Deformation of clothes by pene- Use a thin needle as much as possible. Use a Wrinkles developed around trating a needle into cloth KN or SF needle (standard needle).
  • Page 154 Trouble Cause (1) Cause (2) Check and corrective measures From the previous page 1-4) The material is inappropriate- 4-A) The needle hole of the throat Replace the current gauge with a new one ly stretched. plate is too large. having a smaller diameter hole. 4-B) The thread relief on the back- Use a presser with a smaller thread relief on side of the presser is too large.
  • Page 155 Trouble Cause (1) Cause (2) Check and corrective measures From the previous page 1-6) Occurrence of puckering by 6-A) The course-woven and The needle thread is made easy to adjust tightening a thread close-woven stitches come to slightly to the low tension by using a weak occur because weaving yarns spring for a thread take-up spring and a thread of clothes are gathered with...
  • Page 156 Trouble Cause (1) Cause (2) Check and corrective measures From the previous page The influence of thread tightness by a thread take-up and a feed dog is reduced by using small presser with a clearance groove. Presser asm. Part No. D1524555DBA (Small clearance groove) Part No.
  • Page 157 Trouble Cause (1) Cause (2) Check and corrective measures From the previous page 2-2) Pressing is inappropriate. 2-A) The pressure is too high. Minimize the pressure. For some materials, sewing with the presser slightly floated with the adjustable screw of the minute presser lifter is effective.
  • Page 158 Trouble Cause (1) Cause (2) Check and corrective measures From the previous page 3-3) The stroke of the thread take- Move the arm thread guide rightward to reduce up lever is too long. the thread feeding with the thread take-up lever.
  • Page 159 Trouble Cause (1) Cause (2) Check and corrective measures From the previous page From the previous page 7-D) The bobbin thread idles in the Adjust the tension of the idling prevention bobbin case. spring with reference to "3.-(4)." 7-E) The bobbin has a flaw. Remove a burr at the flaw portion, or replace the bobbin.
  • Page 160 Trouble Cause (1) Cause (2) Check and corrective measures 4. Stitch skipping 4-1) The needle is defective. 1-A) The needle is bent. Replace the needle. The machine fails to form a com- plete stitch. 1-B) The needle mounting direction Mount the needle appropriately. Replace the needle clamp screw.
  • Page 161 Trouble Cause (1) Cause (2) Check and corrective measures From the previous page 4-4) The sewing speed is too high. Reduce the sewing speed. 4-5) The feed timing is inappropri- 5-A) The needle is bent by the thick Hasten the feed timing. ate.

  • Page 162: Sewing Performance

    Trouble Cause (1) Cause (2) Check and corrective measures From the previous page 5-3) The thread take-up spring is 3-A) The stroke of the thread take-up Adjust the stroke of the thread take-up spring. inappropriately adjusted. spring is too long or too small. 3-B) The tension of the thread take- Adjust the tension of the thread take-up spring.
  • Page 163 Trouble Cause (1) Cause (2) Check and corrective measures 6. Thread breakage at back or back- 6-1) The needle has improperly 1-A) The orientation of the needle is Attach the needle so that the long groove of tuck sewing been attached. wrong.
  • Page 164 Trouble Cause (1) Cause (2) Check and corrective measures 7. Thread breakage at needle entry 7-1) The needle has improperly 1-A) The orientation of the needle is Attach the needle so that the long groove of or idle stitching. been installed. wrong.
  • Page 165 Trouble Cause (1) Cause (2) Check and corrective measures From the previous page 8-5) Pressing is inappropriate. 5-A) The presser is floating. Readjust the position of the presser bar holder. 5-B) The parallel level of the presser Replace the presser, or loosen the presser bar is inappropriate.
  • Page 166 Trouble Cause (1) Cause (2) Check and corrective measures 10. Irregular stitch 10-1) The matters related to the 1-A) Hook oil is too large or too small Adjust the oil volume to the appropriate level. Thread knots appear on either hook are inappropriate.
  • Page 167 Trouble Cause (1) Cause (2) Check and corrective measures From the previous page From the previous page 5-B) The thread path has a flaw. Finish the thread path appropriately. 5-C) The thread path has an obsta- Finish the thread path appropriately. cle.
  • Page 168 Trouble Cause (1) Cause (2) Check and corrective measures 12. The bird’s nest at the start of sew- 12-1) The remaining length of By strengthening the first thread tension, short- ing is big. needle thread after a thread en the remaining length of needle thread after trimming is long.
  • Page 169 Trouble Cause (1) Cause (2) Check and corrective measures 16. Faulty thread trimming 16-1) Wear of the cutting portion It is replaced by a new knife. (The needle thread is not of a thread trimming knife or trimmed.) loop spreading knife (The bobbin thread is not trimmed.) 16-2) The thread loop formation is...
  • Page 170 – 157 –...

  • Page 171: Block Diagram

    12. Block diagram DDL-8000A Control Box DDL-8000A head General export type : 40211954 CE Type : 40212265 Principal axis motor output Principal axis motor encoder Presser motor output Thread presser solenoid For production control (JaNets) Bird's nest preventing unit TB switch with LED...

  • Page 172: Drawing Of Table

    Y–Y Section Rubber Installation Reference Figure ❽ 20 +0.5 ❾ 21 +0.5 ⓴ ❿ 2 x ø 3.5, Depth : 10 ⓱ ⓳ ⓫ JUKI logo type Thickness : 0.8 ⓬ 181 –1 Thickness : 0.5 ⓲ ⓭ 17.5 ±0.5 ⓮ 23.5 Thickness : 1.5...
  • Page 173 Please do not hesitate to contact our distributors or agents in your area for further information when necessary. Copyright © 2019 JUKI CORPORATION. * The description covered in this engineer's manual is subject to change for improvement of the All rights reserved throughout the world.

Table of Contents