Global 3900-DD Series Instruction Manual And Parts Book
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Global 3900-DD Series Instruction Manual And Parts Book

High-speed lockstitch sewing machine with motor buil t in head
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INSTRUCTION MANUAL BOOK & PARTS BOOK
/3900L H -
3900
Seri s
D O
OD
HIGH-SPEED LOCKSTITCH SEWING
MACHINE WITH MOTOR BUil T IN HEAD
GLOBALSEW.COM

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Summary of Contents for Global 3900-DD Series

  • Page 1 INSTRUCTION MANUAL BOOK & PARTS BOOK /3900L H - 3900 Seri s HIGH-SPEED LOCKSTITCH SEWING MACHINE WITH MOTOR BUil T IN HEAD GLOBALSEW.COM...
  • Page 2 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 3 GLOBAL assumes no responsibility for damages or personal injury or death resulting from the use of the machine for any application other than the intended one.
  • Page 4 ( I ) Table and table stand 1. Be sure to use GLOBAL 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 GLOBAL genuine ones, select the table and table stand which are able to support the machine weight and reaction force during operation.
  • Page 5 7. If the machine cannot be normally operated after repair or adjustment, immediately stop operation and contact GLOBAL or the distributor in your area for repair in order to prevent accident that can result in ,er sonal injury or death.
  • Page 6 FOR SAFE OPERATION 1. Don't put your hand under the needle when you turn "on" the power switch or operate the machine. 2. Don't put your hand into the thread take-up cover while the machine is running. 3. Turn OFF the power switch before tilting the machine head or removing the belt cover and the V belt.

  • Page 7: Table Of Contents

    CONTENTS INSTRUCTION MANUAL 1.SPECIFICATIONS 2. INSTALLATION 3.MISCELLANEOUS COVER COMPONENTS --- 4.ADJUSTING THE HELGHT OF THE KNEE LIFT 5. INSTALLING THE THREAD 6.LUBRICATION 7.ADJUSTING THE AMOUNT OF OIL (OIL SPLASHES) IN THE HOOK---- P4 8.ATTACHING THE NEEDLE 9.SETTING THE BOBBIN INTO THE BOBBIN CASE 10.ADJUSTING THE STITCH LENGTH 11.PRESSER FOOT PRESSURE 12.HAND LIFTER...

  • Page 8: Specifications P1

    1. SPECIFICATIONS 3900DD 3900LH Application Medium-weight materials, General fabrics, light-weight heavy-weight materials and medium-weiaht materials Sewing speed Max. 4, 0 00 sti/min Max. 3,500 sti/min Max. 4mm Max. 6 mm Stitch length Needle DB x 1 #20to#23 (134 #125 to#160) DP x 1 #9 to #18 (134 #65to#110) Presser foot lift (by knee lifter) 10 mm (Standard) 13 mm (Max.)

  • Page 9: Adjusting The Helght Of The Knee Lift P2

    3. INSTALLING THE BELT COVER AND THE BOBBIN WINDER 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. 4.

  • Page 10: Installing The Thread P3

    5. INSTALLING THE THREAD STAND 6. LUBRICATION 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. (1) Information on lubrication 1) Fill oil pan O with JUKI New Defrix Oil No.

  • Page 11: Adjusting The Amount Of Oil (Oil Splashes) In The Hook

    7. ADJUSTING THE AMOUNT OF OIL (OIL SPLASHES) IN THE HOOK WARNING: Be extremely careful about the operation of the machine since the amount of oil has to be checked by turning the hook at a high speed. � ® G) Amount of oil (oil splashes) confirmation paper Position to confirm the amount of oil (oil splashes) .,...

  • Page 12: Attaching The Needle

    8. ATTACHING THE NEEDLE 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. ✓ 9. SETTING THE BOBBIN INTO THE BOBBIN CASE 1 ) Pass the thread through thread slit and pull the thread in direction 4).

  • Page 13: Presser Foot Pressure

    11. PRESSER FOOT PRESSURE 29-32 mm 12. HAND LIFTER 13. ADJUSTING THE HEIGHT OF THE PRESSER 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. 1) Loosen setscrew and adjust the presser bar height or the angle of the presser foot.

  • Page 14: Threading The Machine Head

    14. THREADING THE MACHINE HEAD 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.
  • Page 15 15. THREAD TENSION (1) Adjusting the needle thread tension 1) As you turn thread tension nut 8 clockwise (in direction 0), the needle thread tension will be in­ creased. 2) As you turn nut 8 counterclockwise (in direction @)), the needle thread tension will be decreased. 3) As you turn thread tenson No.

  • Page 16: Height Of The Feed Dog

    1 8. NEEDLE-TO-HOOK RELATIONSHIP 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. (1) Adjust the timing between the needle and the hook as follows 1) Turn the handwheel to bright the needle bar down to the lowest point of its stroke, and loosen set­...

  • Page 17: Tilt Of The Feed Dog

    TILT 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. 1 ) T he standard tilt (horizontal) of the feed dog is ob­ tained when marker dot O on the feed bar shaft is aligned with marker dot 4D on feed rocker •·...
  • Page 18 22. PEDAL PRESSURE AND PEDAL STROKE 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. 1) Adjustng the pressure reured to depress the front part of the pedal This pressur can be changed by changing the mounting position of pedaling pressure adjust spring...
  • Page 19 1.Machine frame & miscel lanous cover components -12-...
  • Page 20 1.Machine frame & miscellaneous cover components Ref. Part Ref. Part Description Description G01-1-01 Face plate G01-1-36 Thread tension disk presser G01-1-02 Face plate agsket G01-1-37 Thread tension disk G01-1-03 Screw 1/8x44 L=4 G01-1-38 Tension post G01-1-04 Atm oil shifld asm. Take-up spring G01-1-39 G01-1-05 Rubber plug...
  • Page 21 2.Main shaft &thread take-up lever components 2. Main shaft &thread take-up lever components Ref. Part Ref. Part Description Description G01-2-01 G01-2-25 Screw 15/64x28 L=10.5 Main shaft front bushing asm. G01-2-02 G01-2-26 Thread take-up crank shaft Oil adjusting collar G01-2-03 G01-2-27 Roller felt Bushing intermediate G01-2-04...
  • Page 22 3.Needle bak, upright shaft &hook driving shaft components r - - -- - - - -- -· -- - - - -, ----- - - - · - - , r ---- - - @- 1 5 & 1-14 <, I �...
  • Page 23 4. Presser foot components 24--- 25� 4.Presser foot components Ref. Part Ref. Part Description Description G01-4-01 Hand lifter G01-4-18 Tension release return sping G01-4-02 Screw 9/64x40 L=10 G01-4-19 Thread release pin spring G01-4-03 Rubber ring G01-4-20 Tension release supporting pin G01-4-04 G01-4-21 Hand liftercam asm.
  • Page 24 5.Feed mechanism componebts 5 Eeed mechanism componebts Ref. Part Ref. Part Description Description G01-5-01 G01-5-35 Feed adjust rod Feed bar asm G01-5-02 G01-5-36 Feed regulator pin Adjusting link spring guide G01-5-03 G01-5-37 Screw 9/64x40 L=6 Screw 11/64x40 L=5 G01-5-04 G01-5-38 Feed regulator Feed spring hood G01-5-05...

  • Page 25: Ilreservoir Components

    7. Oil reservoir components 6.0i I lubl ication components ,, , ,,, - - - � • - -,a - - - - - / , 1 4; : �----------------------,: ,- ; 1s:: _,,, �- i 1_6_-_ :' � - - ���� -_-_:;...
  • Page 26 8. Thread stand components 9. Accessories 8. Thread stand components Part Part Ref. Ref. Description Description G01-8-01 G01-8-11 Spool rest rod joint Thread stand asm. G01-8-02 G01-8-12 Spool pin asm. Screw M5 L=14 G01-8-03 G01-8-13 Spool retainer NutM5 G01-8-04 G01-8-14 Spool pin Spool rest rod ,lower G01-8-05...
  • Page 27 10. Exclusive pares for 3900LH-DD - 1 0 L ________ _J 1 3 � ----e 2� -20-...
  • Page 28 10. Exe I us i ve parts for 3900 L H- DD 3900-LH DD Ref.NO Part.NO Name of parts G03-10-1 Thread take-up lever ASM G03-10-2 Needle bar crank G03-10-3 Needle bar crank rod G03-10-4 Thread take-up lever G03-10-5 Counter weight G03-10-6 Feed drive eccentric cam Feed dial...
  • Page 29 OLOBAL GLOBALSEW.COM...

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