JUKI LU-1510 Engineer's Manual
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JUKI LU-1510 Engineer's Manual

JUKI LU-1510 Engineer's Manual

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1-NEEDLE, UNISON FEED, LOCKSTITCH MACHINE
(AUTOMATIC LUBRICATION)
LU-1510
1-NEEDLE, UNISON FEED, LOCKSTITCH MACHINE WITH AUTOMATIC THREAD
TRIMMER (AUTOMATIC LUBRICATION)
LU-1510-7
1-NEEDLE, UNISON FEED, LOCKSTITCH MACHINE
LU-1508
1-NEEDLE, UNISON FEED, LOCKSTITCH MACHINE (FOR EXTRA HEAVY-WEIGHT MATERIALS)
LU-1508H
ENGINEER'S MANUAL
29339306
No.01

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  • Page 1 1-NEEDLE, UNISON FEED, LOCKSTITCH MACHINE (AUTOMATIC LUBRICATION) LU-1510 1-NEEDLE, UNISON FEED, LOCKSTITCH MACHINE WITH AUTOMATIC THREAD TRIMMER (AUTOMATIC LUBRICATION) LU-1510-7 1-NEEDLE, UNISON FEED, LOCKSTITCH MACHINE LU-1508 1-NEEDLE, UNISON FEED, LOCKSTITCH MACHINE (FOR EXTRA HEAVY-WEIGHT MATERIALS) LU-1508H ENGINEER’S MANUAL 29339306 No.01...
  • Page 2 PREFACE This Engineer’s Manual is written for the technical personnel who are responsible for the service and maintenance of the machine. The Instruction Manual for these machines intended for the maintenance personnel and operators at an apparel factory contains operating instructions in detail. And this manual describes “Standard Adjustment”, “Adjustment Procedures”, “Results of Improper Adjustment”, and other important information which are not covered by the Instruction Manual.

  • Page 3: Table Of Contents

    ◯ In case of the machine with thread trimmer ....................19 Ⅱ. Amount of alternate movement of walking foot and presser foot ................19 15) Needle sway (Optional selection of LU-1510 and LU-1510-7 only) .................21 16) Stitch length of normal/reverse feed ........................21 17) Balancer ...................................21...

  • Page 4: Specifications

    – Thread trimming method Lubrication Automatic (partial manual oiling) Lubricating oil JUKI New Defrix Oil No. 2 Bed size 517 mm x178 mm Free space for sewing 255 mm x 99 mm Effective diameter of V belt section : ø93.3 mm Handwheel size Outer diameter : ø160 mm...
  • Page 5 Box feed Feed mechanism Main shaft/hook driving shaft drive Timing belt Lubrication Manual oiling JUKI New Defrix Oil No. 2 Lubricating oil Bed size 517 mm x 178 mm Free space for sewing 255 mm x 99 mm Handwheel size Effective diameter of V belt section : ø93.3 mm...

  • Page 6: Standard Adjustment

    Top surface of throat plate Fig. 1 Model Dimension A Fig. 2 9 ± 0.1 mm LU-1510-7 8.5 ± 0.1 mm LU-1510 Conditions LU-1508 • Needle bar is set to the lower dead point of its stroke. 8 ± 0.1 mm LU-1508H •...
  • Page 7 Adjustment Procedures Results of Improper Adjustment 1. Set the stitch dial to “0” mm. • Stitch skipping or needle breakage 2. Turn the handwheel to bring the needle bar to the lower dead will result. point of its stroke. • Loose stitches will result.

  • Page 8: Lateral Position Of The Feed Dog

    ③ ④ ② ① Fig. 8 Fig. 7 Model Dimension A LU-1510 0.4 to 0.5 mm Conditions LU-1510-7 • Feed amount : 0 mm • Height of the feed dog is at its maximum. LU-1508 0.8 to 0.9 mm LU-1508H − ...
  • Page 9 Adjustment Procedures Results of Improper Adjustment 1. Set the stitch dial to “0” mm. • Stitch skipping or thread breakage 2. Turn the handwheel to bring the needle bar to the lower dead will result. point of its stroke. • Loose stitches will result. 3.

  • Page 10: Height Of The Hook

    Standard Adjustment 5) Height of the hook ② ① Fig. 9 6) Adjusting the inner hook guide ③ ② ④ Conditions ① • When the inner hook guide travels to To come in contact with each other its back end. •...
  • Page 11 Adjustment Procedures Results of Improper Adjustment 1. Replace the thrust washer of the hook shaft upper bushing • Stitch skipping or thread breakage and adjust so that the clearance provided between inner hook will result. stopping section ① in the throat plate and top surface ② of •...

  • Page 12: Needle-To-Hook Timing

    Standard Adjustment 7) Needle-to-hook timing Fig. 12 ② Model Dimension A ① LU-1510 56.8 mm LU-1508 LU-1510-7 58.8 mm LU-1508H 52.3 mm Fig. 11 ④ ⑤ ④ ③ Fig. 14 Fig. 13 0.05 to 0.15 mm ⑦ ⑥ ⑥ ⑦...
  • Page 13 5. Adjust the distance from the lower end of the needle bar frame to the lower end of the needle bar to the dimension A, and tighten the setscrew. (For the LU-1510-7, there is an engraved marker line on the needle bar.) Ⅱ . Needle-to-blade point of hook timing 1.

  • Page 14: Presser Lifter Lever

    Standard Adjustment 8) Presser lifter lever ① ③ ② Presser lifter lever Fig. 17 Fig. 18 Condition Top surface of • State that the presser lifter throat plate lever is lifted. Fig. 19 9) Knee lifter ② ① Knee-lifter Knee-lifter lever A lever B Fig.
  • Page 15 Adjustment Procedures Results of Improper Adjustment 1. Loosen setscrew ① in the side cover located on the anti- ○ When the lifting amount of the operator’s side, and remove side cover ② . presser foot is large : 2. Loosen screw ③ in the presser bar holder to make the state •...

  • Page 16: Main Shaft-To-Hook Driving Shaft Timing

    To be parallel. ③ ① Fig. 22 11) Feed drive eccentric cam timing ○ In case of LU-1508, LU-1510, LU-1510-7 Main shaft Setscrew No. 1 ③ Conditions • Feed amount : Maximum • Needle bar is set to the lower dead point of its stroke.
  • Page 17 Adjustment Procedures Results of Improper Adjustment 1. Set the stitch dial to “0” mm. • Loose stitches will result. 2. Turn the handwheel to bring the needle bar to the lower dead • Feed timing and needle-to-hook point of its stroke. timing will change.

  • Page 18: Installing Position Of The Alternate Vertical Movement Amount Detecting Switch

    Standard Adjustment 12) Installing position of the alternate vertical movement amount detecting switch ● Sewing speed of LU-1510-7 Alternate vertical ① Amount of alternate vertical Stitch length : Less Stitch length : More than 6 mm movement dial movement than 6 mm to less than 9 mm Less than 2.5 mm...
  • Page 19 Adjustment Procedures Results of Improper Adjustment 1. Turn the alternate vertical movement dial to adjust the scale • Sewing speed may not change “1” to the convex of the top cover. even when the alternate vertical 2. Loosen setscrew ① in the alternate vertical movement dial movement dial is turned.

  • Page 20: Top Feed Cam Timing

    Ⅰ . Amount of alternate vertical movement of walking foot and presser foot ◯ In case of the machine ● Sewing speed table without thread trimmer • In case of LU-1510 and LU-1508 ③ Amount of alternate vertical Stitch length : More than 6 Stitch length : 6 mm or less ②...
  • Page 21 Adjustment Procedures Results of Improper Adjustment ○ In case of LU-1508, LU-1508H, LU-1510. • Pitch error at high/low speed will be 1. Set the stitch dial to “0” mm. deteriorated. 2. Adjust the amount of alternate vertical movement of walking foot and presser foot to the standard.

  • Page 22: In Case Of The Machine With Thread Trimmer

    Standard Adjustment ◯ In case of the machine with thread trimmer ① 73 to 74 mm ② Operator’s side Fig. 32 End face of machine arm ③ ① ④ End faces are aligned with each other. Fig. 33 Ⅱ . Amount of alternate movement of walking foot and presser foot ①...
  • Page 23 Adjustment Procedures Results of Improper Adjustment ◯ In case of the machine with thread trimmer 1. Remove the top cover. 2. Loosen setscrew ① in the alternate vertical movement adjusting arm. 3. Set alternate vertical movement adjusting arm ① to the position of 73 to 74 mm from end face ②...

  • Page 24: Needle Sway (Optional Selection Of Lu-1510 And Lu-1510-7 Only)

    Standard Adjustment 15) Needle sway (Optional selection of LU-1510 and LU-1510-7 only) ① ② Feed rock shaft ③ 20 ± 0.5 mm Engraved marker line Fig. 37 16) Stitch length of normal/reverse feed ① ② Condition Feed amount : 6 mm...
  • Page 25 Adjustment Procedures Results of Improper Adjustment 1. Loosen hinge screw nut ① of the feed drive rear arm. • Needle breakage or stitch skipping 2. Move feed rock connecting rod ② so that the distance from will result. the center of the feed rock shaft to the center of the hinge screw is 20 ±...

  • Page 26: Position Of The Reverse Feed Control Lever

    Standard Adjustment 18) Position of the reverse feed control lever ◯ In case of LU-1510-7 and LU-1508H ◯ In case of LU-1510 and LU-1508 ② ① Stitch dial To be almost flush ① Fig. 42 Stitch dial Reverse feed control lever Fig.
  • Page 27 Adjustment Procedures Results of Improper Adjustment ◯ In case of LU-1510-7 and LU-1508H ● When the position of the reverse 1. Set the stitch dial to the maximum. feed control lever is low : 2. At this time, loosen hexagon headed bolt ③ in the feed R e v e r s e f e e d c o n t r o l l e v e r regulator to adjust so that a clearance of 1 ±...

  • Page 28: Lubrication

    Standard Adjustment 20) Lubrication ◯ In case of LU-1508 and LU-1508H ① Oil surface 1 mm ② Fig. 46 Inc. A sheet of paper Dec. ④ ③ Fig. 47 −  −...
  • Page 29 Adjustment Procedures Results of Improper Adjustment 1. Put sponge ② in oil reservoir ① and fill the oil reservoir with ● When the amount of oil is short : oil so that the oil surface is higher by 1 mm than the upper •...
  • Page 30 Standard Adjustment ◯ In case of LU-1510 and LU-1510-7 ⑩ ⑪ ② ② ⑥ ③ ⑫ ⑦ ③ ① Fig. 48 ⑧ ⑨ Inc. Dec. ⑬ ⑮ ⑭ A sheet of paper Fig. 50 Fig. 49 −  −...
  • Page 31 • Hook is heated resulting in with a clip. seizure. 3. Pour the JUKI New Defrix Oil No. 2 into the oil tank until HIGH ● When the amount of oil is too much : level is reached. 4. Add the same lubricating oil up to HIGH level as soon as the •...

  • Page 32: Standard Adjustment Of The Additional Devices (Lu-1510-7)

    Standard Adjustment 3. STANDARD ADJUSTMENT OF THE ADDITIONAL DEVICES (LU-1510-7) (1) Thread trimmer device 1) Position of the counter knife and the clamp spring Condition ① ② • To make the end face come in contact with the difference in step of counter knife base A 1.7 mm...
  • Page 33 Adjustment Procedures Results of Improper Adjustment ◯ Position of the counter knife ● When dimension A is large : 1. Loosen counter knife setscrews ① . • Length of bobbin thread clamp is 2. Make the end face of the counter knife come in contact with shortened.

  • Page 34: Vertical Position Of The Moving Knife

    Standard Adjustment 3) Vertical position of the moving knife ③ Moving knife shaft ④ ③ ② Fig. 54 ① Driving arm Fig. 55 4) Adjusting the knife pressure Conditions ③ • Moving knife comes in contact with counter knife. • Driving arm comes in close contact with stopper plate. ①...
  • Page 35 Adjustment Procedures Results of Improper Adjustment 1. Loosen setscrew ① in the driving arm. ● When the clearance is large : 2. Loosen setscrews ② in the moving knife shaft thrust collar. • Defective clamp of needle and 3. Adjust so that a clearance of 0.3 to 0.4 mm is provided bobbin threads will occur.

  • Page 36: Thread Trimmer Solenoid

    Standard Adjustment 5) Thread trimmer solenoid ④ ⑤ ① Condition ⑥ • Link installing base comes in close ③ contact with thread trimmer driving plate. To come in close contact with each other ② Fig. 59 6) Thread trimmer cam ①...
  • Page 37 Adjustment Procedures Results of Improper Adjustment 1. Loosen setscrews ① in the thread trimmer shaft connecting plate. 2. Make link installing base ② come in close contact with thread trimmer driving plate ③ . 3. In this state, install solenoid connecting arm ⑥ so that a clearance of 0.05 to 0.15 mm is provided between plunger stopper ④...

  • Page 38: Thread Trimmer Cam Timing

    Standard Adjustment 7) Thread trimmer cam timing Engraved marker dot on the machine arm Red engraved marker dot ① ② ③ ④ Hook driving shaft Section R to come in close To come in close contact contact with cam roller with each other Fig.
  • Page 39 Adjustment Procedures Results of Improper Adjustment ● When the timing is retarded : 1. Turn the handwheel to align the red engraved marker dot on • Thread trimming action does not the handwheel with the engraved marker dot on the machine complete even at the needle-up arm.

  • Page 40: Installaion Of The Optional Parts

    Replacing procedure 4. INSTALLAION OF THE OPTIONAL PARTS (1) Automatic reverse feed device 2) Removing the reverse feed control lever 1) Removing the side plate ② Side plate A Handwheel ④ ① ⑤ Stitch dial Fig. 66 Fig. 67 3) Installing the reverse feed link hinge screw ②...
  • Page 41 Installing procedure ◯ Removing procedure 1) Removing the side plate 1. Loosen setscrews ① in the side plate B located at the anti-operator’s side of the machine arm. 2. Remove side plate B ② . 3. Remove side plate B gasket ③ . 2) Removing the reverse feed control lever 1.

  • Page 42: Installing The Reverse Feed Control Lever

    Installing procedure 4) Installing the reverse feed control lever ③ ⑥ ④ ② ① ⑨ Fig. 70 ⑧ ⑤ ⑦ Fig. 71 5) Installing the automatic reverse feed device ④ ⑥ ⑤ ⑩ ⑪ ⑫ ⑬ ⑨ ⑦ ③ ⑧ ①...
  • Page 43 Installing procedure 4) Installing the reverse feed control lever 1. Install lever spring bracket ② to reverse feed control lever  ① with setscrew ③ . 2. Install reverse feed control lever stopper ④ to the machine arm with setscrew ⑤ . 3.

  • Page 44: Installing The Touch-Back Switch

    Installing procedure 6) Installing the touch-back switch ① ② Fig. 73 7) Installing the pneumatic components Table ② ① Fig. 74 1. Install the pneumatic components ① on the table with setscrews ② . 2. Connect the pneumatic components with the air hose. − ...
  • Page 45 Standard Adjustment ◎ Attaching parts list of the reverse feed control lever (List 2) Note Part No. Name of part Q’ty 22656003 Lever spring suspension SS4120615SP Lever spring suspension setscrew 11100500 Reverse feed control lever stopper SS7112420SP Reverse feed control lever stopper setscrew 10120004 Lever return spring suspension 22656102...
  • Page 46 Installing procedure 6) Installing the touch-back switch 1. Install touch-back switch ① with switch installing plate setscrews ② . Installing parts list Note Part No. Name of part Q’ty 21348552 Automatic reverse feed device set 21348909 Side plate D PA320150200 Reverse feed cylinder SM6061602TP Reverse feed cylinder setscrew...
  • Page 47 MEMO −  −...

  • Page 48: Automatic Presser Foot Lifter

    Installing procedure (2) Automatic presser foot lifter 1) Assembling the automatic presser foot lifter ⑤ ⑪ ③ ④ ⑩ ⑩ ② ⑫ ① ② ⑧ ⑬ ⑥ ⑦ ⑨ Fig. 75 Fig. 76 −  −...
  • Page 49 8. Install pneumatic components. For the LU-1510-7, add the device for presser foot lifter to the pneumatic components being used now. For the models other than LU-1510-7, install the pneumatic components (asm.). 9. Insert the air hose and check the operation.

  • Page 50: Installing The Pneumatic Device Components

    ⑪ ⑥ ⑨ Fig. 77 ◎ When installing the automatic presser foot lifter to LU-1510, LU-1508 and LU-1508H after set-up of the machine ◯ Pneumatic device used : AK-120K and AK-120B • Install the pneumatic components (asm.) as listed. ①...
  • Page 51 Quick joint (branch elbow Y) SM4034001SN Solenoid valve setscrew HX002950000 Wire mark HX00295000A Wire mark • Pneumatic device components (in case of LU-1510, LU-1508 and LU-1508H) Note Part No. Name of part Q’ty GAKA14010A0 Pneumatic components (asm.) • Kit A (knee lifter switch) Note Part No.

  • Page 52: Portion To Which Locktite Is Applied

    5. PORTION TO WHICH LOCKTITE IS APPLIED LOCKTITE has been applied to the following parts at the time of assembly at the factory. When an assembly which includes the aforementioned parts has been disassembled, be sure to wash the LOCKTITE applied part using a paint thinner or the like, and re-assemble it using LOCKTITE after removing any moisture from the mating faces.

  • Page 53: Selective Parts And Consumable Parts

    Needle MC372001600 SCHMETZ 135x17 Nm 160 Hook (asm.) B18305630A0 Bobbin B9117563000 Hook shaft upper bushing thrust washer is the same as that for LU-1510. (See the above table.) ● For LU-1508H Consumable part Part No. Remarks Needle MC0190R1600 SCHMETZ 190 Nm 160 Hook (asm.)

  • Page 54: Engraved Marker Dots On The Handwheel

    Needle-up stop position at the time of reverse revolution to lift needle Thread trimming posiion (standard) Range of needle-up stop positoion (white) Adjustment of thread trimmer cam (red) Fig. 79 8. PIPING DIAGRAM (LU-1510 AND LU-1510-7) LU-1510 LU-1510-7 Fig. 80 −  −...

  • Page 55: Table Of Troubles In Sewing And Corrective Measures

    9. TABLE OF TROUBLES IN SEWING AND CORRECTIVE MEASURES Troubles Causes Checking Corrective measures 1. Thread breakage Thread path, needle point, Check the sharp edge or Remove the sharp edges or hook blade point or inner burr on the respective parts. burrs on the blade point of hook hook resting groove on the using a fine emery paper.
  • Page 56 Troubles Causes Checking Corrective measures 2. Stitch skipping Clearance between the Check the clearance. Refer to “Needle-to-hook needle and the blade point timing” on page 9. of hook is too large. Needle-to-hook timing is Check the specified dimension. Refer to “Needle-to-hook excessively advanced or timing”...
  • Page 57 Troubles Causes Checking Corrective measures 3. Loose stitches Clearance of the inner hook Check the clearance. Refer to “Adjusting the inner ( B a l l o o n s t i t c h e s o r guide is too large. hook guide”...
  • Page 58 Troubles Causes Checking Corrective measures 4. Irregular stitches Stroke of the thread take-up Check the stroke of the Adjust the thread take-up spring spring is improper. thread take-up spring. to move to approximately 1 mm from the initial position when hook draws thread maximumly.

  • Page 59: Trable Of Troubles In Thread Trimming And Corrective Maesures

    10. TRABLE OF TROUBLES IN THREAD TRIMMING AND CORRECTIVE MAESURES Troubles Causes Checking Corrective measures 1. One or several stitches Thread remaining at the C h e c k t h e r o u t i n g o f Thread the needle thread skip at the start of sewing.
  • Page 60 Troubles Causes Checking Corrective measures 2. Thread slips off the Needle thread slips off the Check whether the needle Refer to the Cause “Needle needle eyelet. needle eyelet immediately thread remaining at the thread remaining at the needle after thread trimming. needle top after thread top after thread trimming is trimming is short.
  • Page 61 Troubles Causes Checking Corrective measures Tension of the bobbin Adjust the tension of bobbin thread is too high. thread. K i n f e p r e s s u r e o f t h e Refer to “Adjusting the knife counter knife is too high.
  • Page 62 ＊ The description covered in this engineer's manual is subject to change for improvement of the TELEX : J22967 commodity without notice. Copyright (C) 1999 JUKI CORPORATION. All rights reserved throughout the world. 99 · 10 Printed in Japan (E)

This manual is also suitable for:

Lu-1510-7Lu-1508Lu-1508h

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