JUKI LU-2810 Series Engineer's Manual
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JUKI LU-2810 Series Engineer's Manual

Direct-drive, 1-needle, unison-feed lockstitch machine with a vertical-axis large hook/ direct-drive, 1-needle, unison-feed lockstitch machine with a vertical-axis large hook with an automatic thread trimmer
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海外講習会用121122 LU-2810(-7)_EM
Direct-drive, 1-Needle, Unison-feed Lockstitch Machine with a Vertical-axis Large Hook
LU-2810
Direct-drive, 1-Needle, Unison-feed Lockstitch Machine with a Vertical-axis Large Hook
with an Automatic Thread Trimmer
LU-2810-7
ENGINEER'S MANUAL
40133310
No. E407-00

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Summary of Contents for JUKI LU-2810 Series

  • Page 1 海外講習会用121122 LU-2810(-7)_EM Direct-drive, 1-Needle, Unison-feed Lockstitch Machine with a Vertical-axis Large Hook LU-2810 Direct-drive, 1-Needle, Unison-feed Lockstitch Machine with a Vertical-axis Large Hook with an Automatic Thread Trimmer LU-2810-7 ENGINEER’S MANUAL 40133310 No. E407-00...
  • Page 2 海外講習会用121122 LU-2810(-7)_EM 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 instruction in detail. And this manual describes “Standard Adjust- ment”, “Adjustment Procedures”, “Results of Improper Adjustment”, and other important information which are not covered in the Instruction Manual.
  • Page 3 海外講習会用121122 LU-2810(-7)_EM T� ENSURE SAFE USE �F Y�UR SEWING MACHINE Adjustment : It means replacement of parts, disassembly, and repair assembly. 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 machine 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 5. Be sure to use JUKI genuine parts when replacing any of the machine parts. JUKI assumes no responsibility for any accident caused by any part other than JUKI genuine one. In addition, in the event you cannot replace parts within the specified range, immediately stop the re- placement work and ask JUKI or distributor in your area for replacement of the parts.

  • Page 8: Electrical Components

    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 9 海外講習会用121122 LU-2810(-7)_EM 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. 3. 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 unfa- miliarity with the machine or electrical-shock accident.
  • Page 10 海外講習会用121122 LU-2810(-7)_EM Precautions to be taken so as to use the LU-2800 Series more safely 1. Keep your hands away from needle when you turn �N the power switch or while the machine is in operation. 2. Do not put your fingers into the thread take-up cover while the machine is operating. DANGER 3.
  • Page 11 海外講習会用121122 LU-2810(-7)_EM CAUTI�N BEF�RE �PERATI�N WARNING : To avoid malfunction and damage of the machine, confirm the following. • Before you put the machine into operation for the first time after the set-up, clean it thoroughly. Remove all dust gathering during transportation and oil it well. •...

  • Page 12: Table Of Contents

    海外講習会用121122 LU-2810(-7)_EM C�NTENTS 1. Specifications ....................1 2. Standard adjustment ..................2 (1) Needle entry position (Standard gauge type) ............... 2 (2) Needle entry position (Europe gauge type) ..............2 (3) Height of the feed dog ..................... 4 (4) Height of the hook ......................4 (5) Adjusting the inner hook guide ..................

  • Page 13: Specifications

    Cam-driven scissors type 20 Lubrication Automatic lubrication by oil tank (with oil gauge) 21 Lubricating oil JUKI New Defrix Oil No. 1 (equivalent to ISO standard VG7) or JUKI MACHINE OIL No. 7 22 Bed size 643 mm × 178 mm 23 Space under the arm 346 mm ×...

  • Page 14: Standard Adjustment

    海外講習会用121122 LU-2810(-7)_EM 2. Standard adjustment (1) Needle entry position (Standard gauge type) WARNING : Turn �FF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Standard adjustment Dimension E Model Gauge type (mm) LU-2810...
  • Page 15 海外講習会用121122 LU-2810(-7)_EM Adjustment procedures Results of Improper adjustment Set the stitch dial to “0”. Stitch skipping or needle break- Turn the handwheel to bring the needle bar to the lowest dead age will result. point of its stroke. Poorly tensed stitches will result. Loosen clamping screw 1 of the needle bar rocking link.

  • Page 16: Height Of The Feed Dog

    海外講習会用121122 LU-2810(-7)_EM (3) Height of the feed dog WARNING : Turn �FF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Standard adjustment Dimension A Model (mm) LU-2810 0.5 to 0.6 LU-2810-7 [Conditions] •...
  • Page 17 海外講習会用121122 LU-2810(-7)_EM Adjustment procedures Results of Improper adjustment Set the stitch dial to “0”. When the height of the feed dog 3 Turn the handwheel to bring the height of the feed dog 3 to is higher than the specified value : the maximum.

  • Page 18: Adjusting The Inner Hook Guide

    海外講習会用121122 LU-2810(-7)_EM (5) Adjusting the inner hook guide WARNING : Turn �FF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Standard adjustment 1) Clearance of inner hook guide Model Dimension A (mm) LU-2810 0.7 to 0.9...
  • Page 19 海外講習会用121122 LU-2810(-7)_EM Adjustment procedures Results of Improper adjustment 1) Clearance of inner hook guide When the clearance is larger than Turn the handwheel in its normal rotational direction to bring the specified value : inner hook guide 1 to its back end position. Loose stitches or thread break- Turn inner hook 2 in the direction of the arrow until inner hook age will result.

  • Page 20: Needle-To-Hook Timing

    海外講習会用121122 LU-2810(-7)_EM (6) Needle-to-hook timing WARNING : Turn �FF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Standard adjustment 1) Height of the needle bar 2) Needle-to-blade point of hook timing 3) Adjusting the hook needle guard Dimension A Dimension B...
  • Page 21 海外講習会用121122 LU-2810(-7)_EM Adjustment procedures Results of Improper adjustment 1) Height of the needle bar Stitch skipping or thread break- Set the stitch dial to “0”. age will result. Loosen setscrews 1 of the face plate to remove the face plate Loose stitches will result.

  • Page 22: Lift Of The Presser Foot

    海外講習会用121122 LU-2810(-7)_EM (7) Lift of the presser foot WARNING : Turn �FF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Standard adjustment 1) Hand lifter [Conditions] • State that the hand lifter is raised. –...
  • Page 23 海外講習会用121122 LU-2810(-7)_EM Adjustment procedures Results of Improper adjustment 1) Hand lifter When the lifting amount is higher Loosen setscrews of the face plate to remove the face plate. than the specified value : Loosen clamping screw 1 of the hand lifter A. The presser foot is held raised Adjust the lifting amount to 10 ±...

  • Page 24: Knee Lifter (Without Thread Trimmer Only)

    海外講習会用121122 LU-2810(-7)_EM WARNING : Turn �FF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Standard adjustment 2) Knee lifter (Without thread trimmer only) [Conditions] • Lifting amount when stopper screw of knee lifter rotation arm comes in contact with mahcine bed.
  • Page 25 海外講習会用121122 LU-2810(-7)_EM Adjustment procedures Results of Improper adjustment 2) Knee lifter (Without thread trimmer only) When the lifting amount is higher Loosen setscrews of the face plate and the rear cover to re- than the specified value : move the face plate and the rear cover. The top end of the needle bar Loosen clamping screw 1 of the knee lifter connecting arm.

  • Page 26: Automatic Presser Foot Lifter (Machine With Thread Trimmer Only)

    海外講習会用121122 LU-2810(-7)_EM WARNING : As the work is performed while the power is �N, never touch the switches other than the necessary one so as to prevent accidents caused by the malfunction of switches. Standard adjustment 3) Automatic presser foot lifter (Machine with thread trimmer only) –...
  • Page 27 海外講習会用121122 LU-2810(-7)_EM Adjustment procedures Results of Improper adjustment 3) Automatic presser foot lifter (Machine with thread trimmer When the lifting amount is higher only) than the specified value : Turn the power ON. Carry out thread trimming once. Turn ON The top end of the needle bar the automatic presser foot lifter.

  • Page 28: Feed Momentum

    海外講習会用121122 LU-2810(-7)_EM (8) Feed momentum WARNING : Turn �FF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Standard adjustment 1) Alternate momentum [Conditions] • Feed amount : 0 mm •...
  • Page 29 海外講習会用121122 LU-2810(-7)_EM Adjustment procedures Results of Improper adjustment 1) Alternate momentum Adjust the amount of alternate verti- Set the stitch dial to “0”. cal movement of the walking foot 1 Turn the handwheel to make sure that the amount of alternate so that it is larger than that of the vertical movement of walking foot 1 and presser foot 2 is presser foot 2 in accordance with...

  • Page 30: Feed Cam Timing

    海外講習会用121122 LU-2810(-7)_EM (10) Feed cam timing WARNING : Turn �FF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Standard adjustment 1) Horizontal feed cam timing No. 2 screw Main shaft [Conditions] •...
  • Page 31 海外講習会用121122 LU-2810(-7)_EM Adjustment procedures Results of Improper adjustment 1) Horizontal feed cam timing Pitch error at high or low speed Set the stitch dial to the maximum. is apt to occur. Loosen two setscrews 1 of the horizontal feed eccentric cam. Needle thread tension will vary.

  • Page 32: Top Feed Cam Timing

    海外講習会用121122 LU-2810(-7)_EM WARNING : Turn �FF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Standard adjustment 3) Top feed cam timing [Conditions] • Feed amount : 6 mm • Amount of alternate vertical movement : 3 mm Main shaft •...
  • Page 33 海外講習会用121122 LU-2810(-7)_EM Adjustment procedures Results of Improper adjustment 3) Top feed cam timing Pitch error at high or low speed Set the stitch dial to “6”. is apt to occur. Set the alternate vertical dial to “3”. Loosen setscrews of the top cover to remove the top cover. Loosen two setscrews 1 of the top feed cam.

  • Page 34: Stitch Length Of Forward/Reverse Feed

    海外講習会用121122 LU-2810(-7)_EM (11) Stitch length of forward/reverse feed WARNING : Turn �FF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Standard adjustment Notched part [Conditions] • Feed amount : 6 mm (12) Position of the reverse feed control lever WARNING : Turn �FF the power before starting the work so as to prevent accidents caused by abrupt start of the...
  • Page 35 海外講習会用121122 LU-2810(-7)_EM Adjustment procedures Results of Improper adjustment Set the stitch dial to “6”. Respective stitch lengths of Loosen two setscrews 1 of the feed adjusting eccentric pin. normal and reverse feeds do not Turn feed adjusting eccentric pin 2 to adjust the stitch length. match.

  • Page 36: Safety Clutch

    海外講習会用121122 LU-2810(-7)_EM (13) Safety clutch WARNING : Turn �FF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Standard adjustment * Standard of release pressure (14) Balancer WARNING : Turn �FF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.
  • Page 37 海外講習会用121122 LU-2810(-7)_EM Adjustment procedures Results of Improper adjustment The safety clutch functions when an excessive load is applied to the lower shaft or the like during sewing. When the safety clutch func- tions, the hook will not rotate even if turning the handwheel, and the lower shaft sprocket wheel 4 only will run idle since the power is not transmitted to the lower shaft.

  • Page 38: Reverse Feed Cylinder

    海外講習会用121122 LU-2810(-7)_EM (15) Reverse feed cylinder WARNING : Turn �FF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Standard adjustment – 26 –...
  • Page 39 海外講習会用121122 LU-2810(-7)_EM Adjustment procedures Results of Improper adjustment Set the stitch dial to the maximum. Stitch lengths of the reverse feed Loosen clamping screw 5 of the reverse feed arm. may not be obtained. Operate the reverse feed control lever to adjust so that the dis- tance between the cylinder support 3 and the cylinder knuckle 4 is 8 ±...

  • Page 40: Lubrication

    海外講習会用121122 LU-2810(-7)_EM (16) Lubrication WARNING : Turn �FF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Standard adjustment A sheet of paper – 28 –...
  • Page 41 Set the filter clamp 4 to oil pan 2 , and fix it with the clip 5 . Pour the JUKI New Defrix Oil No. 1 into the oil tank. (Caution) Adjust the oil quantity so that the pointer of oil gauge 6 stays between Max and Min.

  • Page 42: Thread Trimmer Device

    海外講習会用121122 LU-2810(-7)_EM (17) Thread trimmer device WARNING : Turn �FF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Standard adjustment 1) Position of the counter knife and the clamp spring To be in contact Mounting groove of the slide plate...
  • Page 43 海外講習会用121122 LU-2810(-7)_EM Adjustment procedures Results of Improper adjustment 1) Position of the counter knife and the clamp spring When dimension A is larger : [Position of the counter knife] Length of bobbin thread clamp Loosen setscrews 1 of the counter knife. is shortened and stitch skipping Press the edge of counter knife 3 against the step difference occurs.

  • Page 44: Position Of The Counter Knife Base

    海外講習会用121122 LU-2810(-7)_EM WARNING : Turn �FF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Standard adjustment 2) Position of the counter knife base To be in contact 1.2 to 1.5 mm (C) 3) Vertical position of the moving knife Adjust at the center part.
  • Page 45 海外講習会用121122 LU-2810(-7)_EM Adjustment procedures Results of Improper adjustment 2) Position of the counter knife base When dimension C is larger : Loosen setscrews 1 of the counter knife base. Knife pressure is increased. As a Move the counter knife base 1 to the position as shown in the result, motor stop will be caused.

  • Page 46: Thread Trimmer Cam Timing

    海外講習会用121122 LU-2810(-7)_EM WARNING : Turn �FF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Standard adjustment 4) Thread trimmer cam timing Most advanced position of moving knife [Conditions] • Two marker dots on the handwheel aligns with marker line on the motor cover.
  • Page 47 海外講習会用121122 LU-2810(-7)_EM Adjustment procedures Results of Improper adjustment 4) Thread trimmer cam timing When thread trimming timing is Loosen setscrews 6 of the thread trimmer cam. retarded : Move the moving knife 1 to most advanced position. Thread trimming action does not Turn the handwheel 2 in the state of step 2.

  • Page 48: Position Of The Thread Trimmer Cam

    海外講習会用121122 LU-2810(-7)_EM WARNING : Turn �FF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Standard adjustment 5) Position of the thread trimmer cam 0.1 ± 0.05 mm 6) Adjusting the knife pressure Knife pressure Initial position –...
  • Page 49 海外講習会用121122 LU-2810(-7)_EM Adjustment procedures Results of Improper adjustment 5) Position of the thread trimmer cam When there is no clearance be- Loosen setscrews 6 of the thread trimmer cam and clamping tween the thread trimmer cam !1 screw 7 of the lower shaft set collar. and the thread trimmer cam roller Set the thread trimmer solenoid to initial position.

  • Page 50: Detection Switch Of The Amount Of Alternate Vertical Movement

    海外講習会用121122 LU-2810(-7)_EM (18) Detection switch of the amount of alternate vertical movement WARNING : Turn �FF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Standard adjustment Sewing speed of LU-2810-7 Amount of alternate vertical Stitch length : More than 7 mm Stitch length : 7 mm or less...
  • Page 51 海外講習会用121122 LU-2810(-7)_EM Adjustment procedures Results of Improper adjustment Turn the alternate vertical dial 1 to adjust the scale between Sewing speed may not change "7.5" to "8". even when turning the alternate Loosen setscrews of the top cover to remove the top cover. vertical dial 1 .

  • Page 52: Portion To Which L�Cktite Is Applied

    海外講習会用121122 LU-2810(-7)_EM 3. Portion to which L�CKTITE is applied LOCKTITE has been applied to the following parts at the time of assembly at the factory. Avoid disassembling these parts to the most. When an assembly which includes the aforementioned parts has been forced to be disassembled, be sure to wash the LOCKTITE applied part using a paint thinner or the like, and reassemble it using LOCKTITE after removing any moisture from the mating faces.

  • Page 53: Selective Parts And Consumable Parts

    海外講習会用121122 LU-2810(-7)_EM 4. Selective parts and consumable parts Selective parts Part name Part No. Remarks Hook shaft selective washer B255728000A t=1.15 to 1.2 mm Hook shaft selective washer B255728000B t=1.05 to 1.1 mm Hook shaft selective washer B255728000C t=0.9 to 0.95 mm Hook shaft selective washer B255728000D t=0.8 to 0.85 mm...

  • Page 54: Applying Grease

    (2) Greasing points 1) Needle bar rocking base Remove face plate. Remove rubber plugs 1 . Fill grease holes with JUKI Grease A. Attach rubber plugs 1 . Wipe off grease that was exposed. Attach face plate. Needle bar...

  • Page 55: Alternate Vertical Change Base

    Apply JUKI grease A to felt 3 . Apply JUKI grease A to sliding surfaces of alternate vertical change base and feed conversion link. Set felt clamp 2 to alternate vertical change base, and fix it with setscrews 1 of felt clamp.

  • Page 56: Greasing Point Indication Drawing (* Indicating The Points Where Grease Is Applied At Shipment.)

    海外講習会用121122 LU-2810(-7)_EM 4) Greasing point indication drawing (* Indicating the points where grease is applied at shipment.) 1 : JUKI Grease A 2 : Unirex N3 3 : Barch L1002 1. MAIN SHAFT & THREAD TAKE-UP LEVER COMPONENTS – 44 –...
  • Page 57 海外講習会用121122 LU-2810(-7)_EM 2. NEEDLE BAR COMPONENTS – 45 –...
  • Page 58 海外講習会用121122 LU-2810(-7)_EM 3. HOOK & OPENNER COMPONENTS – 46 –...
  • Page 59 海外講習会用121122 LU-2810(-7)_EM 4. UPPER FEED COMPONENTS – 47 –...
  • Page 60 海外講習会用121122 LU-2810(-7)_EM 5. HAND LIFTER & AUTO LIFTER COMPONENTS 6. KNEE LIFTER COMPONENTS (FOR LU-2810) – 48 –...
  • Page 61 海外講習会用121122 LU-2810(-7)_EM 7. LOWER FEED COMPONENTS – 49 –...
  • Page 62 海外講習会用121122 LU-2810(-7)_EM 8. FEED ADJUST COMPONENTS – 50 –...
  • Page 63 海外講習会用121122 LU-2810(-7)_EM 9. DL COMPONENTS (FOR LU-2810-7) 10. AUTO BT COMPONENTS (FOR LU-2810-7) – 51 –...
  • Page 64 海外講習会用121122 LU-2810(-7)_EM 11. THREAD TRIMMING COMPONENTS (FOR LU-2810-7) – 52 –...
  • Page 65 海外講習会用121122 LU-2810(-7)_EM 12. THREAD TENSION COMPONENTS – 53 –...
  • Page 66 海外講習会用121122 LU-2810(-7)_EM 13. TENSION RELEASE COMPONENTS (FOR LU-2810-7) – 54 –...
  • Page 67 海外講習会用121122 LU-2810(-7)_EM 14. BOBBIN WINDER COMPONENTS – 55 –...

  • Page 68: Engraved Marker Dots On The Handwheel (For The Machine With Thread Trimmer Only)

    海外講習会用121122 LU-2810(-7)_EM 6. Engraved marker dots on the handwheel (for the machine with thread trimmer only) UP stop position (�ne marker dot) Adjustment of thread trimmer cam (Two marker dots) Adjustment of opener timing (Three marker dots) – 56 –...

  • Page 69: Lubrication Route Diagram

    海外講習会用121122 LU-2810(-7)_EM 7. Lubrication route diagram �il tank �il regulating valve Pump Oil filter To oil pan : Lubrication : Circulation...

  • Page 70: Machine Head Wiring (For The Machine With Thread Trimmer Only)

    海外講習会用121122 LU-2810(-7)_EM 8. Machine head wiring (for the machine with thread trimmer only) (1) Connectors coming from machine head (Connect to control box) CN36 : 14P connector CN37 : 2P connector Pin No. Part name Remarks Pin No. Part name Remarks Thread release solenoid (lower side) —...

  • Page 71: Connectors That Are Connected In The Head Cover

    海外講習会用121122 LU-2810(-7)_EM CN58 : 22P connector CN59 : 26P connector Pin No. Part name Remarks Pin No. Part name Remarks Solenoid valve +24V — Solenoid valve +24V — Solenoid valve +24V — — +24V — Solenoid valve +24V — — +24V —...

  • Page 72: Troubles And Corrective Measures

    海外講習会用121122 LU-2810(-7)_EM 9. Troubles and corrective measures (1) With regard to sewing WARNING : Turn �FF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Trouble Cause Checking Corrective measures 1.
  • Page 73 海外講習会用121122 LU-2810(-7)_EM WARNING : Turn �FF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Trouble Cause Checking Corrective measures 3. Needle thread trails 2 to 3 cm from 3-1) Needle thread tension is too Adjust the needle thread tension.
  • Page 74 海外講習会用121122 LU-2810(-7)_EM WARNING : Turn �FF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Trouble Cause Checking Corrective measures 4. Stitch skipping 4-1) Clearance between the 1-A) Check the clearance. Refer to “2.-(6) Needle-to-hook timing”.
  • Page 75 海外講習会用121122 LU-2810(-7)_EM WARNING : Turn �FF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Trouble Cause Checking Corrective measures 5. Loose stitches (Balloon stitches or 5-1) Clearance between the 1-A) Check the clearance.
  • Page 76 海外講習会用121122 LU-2810(-7)_EM WARNING : Turn �FF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Trouble Cause Checking Corrective measures 7. Irregular stitches 7-1) Stroke of the thread take-up 1-A) Check the stroke of the Adjust the thread take-up spring to move to ap- spring is improper.

  • Page 77: With Regard To Thread Trimming

    海外講習会用121122 LU-2810(-7)_EM (2) With regard to thread trimming WARNING : Turn �FF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Trouble Cause Checking Corrective measures 1. One or several stitch- 1-1) Thread remaining at the needle top 1-A) Check the routing of needle thread.
  • Page 78 海外講習会用121122 LU-2810(-7)_EM WARNING : Turn �FF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Trouble Cause Checking Corrective measures 2. Thread slips off the 2-1) Needle thread slips off the needle eye- 1-A) Check whether the needle thread re- Refer to the cause of previous section “Needle thread needle eyelet.
  • Page 79 海外講習会用121122 LU-2810(-7)_EM WARNING : Turn �FF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Trouble Cause Checking Corrective measures From the previous page 3-3) Moving knife stops during operation. 3-A) Thread is too thick.
  • Page 80 海外講習会用121122 LU-2810(-7)_EM WARNING : Turn �FF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine. Trouble Cause Checking Corrective measures From the previous page 3-6) Both needle and bobbin thread cannot 6-A) The blades of moving knife and counter Refer to “2.-(17)-4) Adjusting the knife pressure”.

  • Page 81: Drawing Of Table

    海外講習会用121122 LU-2810(-7)_EM 10. Drawing of table (1) For without thread trimming W-W (3 locations) U-U (2 locations) V-V (2 locations) Y-Y (2 locations) A 4 × ø3.4 on the bottom surface, depth 20 (Drill a hole at the time of set-up.) B Installing position of drawer stopper (on the bottom surface) C ø16 depth 25 D ø17 drilled hole...

  • Page 82: For Sc-922

    海外講習会用121122 LU-2810(-7)_EM (2) For SC-922 W-W (3 locations) A 4 × ø3.4 on the bottom surface, depth 20 (Drill a hole at the time of set-up.) U-U (2 locations) V-V (2 locations) Y-Y (2 locations) B Installing position of drawer stopper (on the bottom surface) C ø16 depth 25 D ø17 drilled hole E 3 ×...
  • Page 83 海外講習会用121122 LU-2810(-7)_EM...
  • Page 84 Please do not hesitate to contact our distributors or agents in your area for further information when necessary. * The description covered in this engineer's manual is subject to change for improvement of the Copyright C 2012 JUKI CORPORATION commodity without notice.

This manual is also suitable for:

Lu-2810-7 seriesLu-2810s-7Lu-2810a-7Lu-2810sLu-2810a

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