JUKI LU-2210N-7 Engineer's Manual
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JUKI LU-2210N-7 Engineer's Manual

1/2-needle, high-speed, unison-feed lockstitch machine with vertical-axis large hook and automatic thread trimmer/2p dial/needle thread clamp device/2p dial
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1-NEEDLE, HIGH-SPEED, UNISON-FEED LOCKSTITCH MACHINE WITH VERTICAL-AXIS LARGE HOOK
AND AUTOMATIC THREAD TRIMMER
LU-2210N-7 LU-2210W-7
1- NEEDLE, HIGH-SPEED, UNISON-FEED LOCKSTITCH MACHINE WITH VERTICAL-AXIS LARGE HOOK
AND AUTOMATIC THREAD TRIMMER (2P DIAL)
LU-2212N-7
1- NEEDLE, HIGH-SPEED, UNISON-FEED LOCKSTITCH MACHINE WITH VERTICAL-AXIS LARGE HOOK
AND AUTOMATIC THREAD TRIMMER (NEEDLE THREAD CLAMP DEVICE/2P DIAL)
LU-2220N-7
2- NEEDLE, HIGH-SPEED, UNISON-FEED LOCKSTITCH MACHINE WITH VERTICAL-AXIS LARGE HOOK
AND AUTOMATIC THREAD TRIMMER
LU-2260N-7 LU-2260W-7
ENGINEER'S MANUAL
29227501
No.E306-04

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Summary of Contents for JUKI LU-2210N-7

  • Page 1 ® 1-NEEDLE, HIGH-SPEED, UNISON-FEED LOCKSTITCH MACHINE WITH VERTICAL-AXIS LARGE HOOK AND AUTOMATIC THREAD TRIMMER LU-2210N-7 LU-2210W-7 1- NEEDLE, HIGH-SPEED, UNISON-FEED LOCKSTITCH MACHINE WITH VERTICAL-AXIS LARGE HOOK AND AUTOMATIC THREAD TRIMMER (2P DIAL) LU-2212N-7 1- NEEDLE, HIGH-SPEED, UNISON-FEED LOCKSTITCH MACHINE WITH VERTICAL-AXIS LARGE HOOK...
  • Page 2 Introduction This Engineer’s Manual is for technical service engineers. In the instruction manual for the maintenance engi- neers of sewing machines and sewing workers in a sewing factory, how to operate a sewing machine is also described in detail. However, in this manual, [Adjustment Procedure], [Results of Value Change for Adjustment], and the roles of each component are described: these are not included in the instruction manual.

  • Page 3: Table Of Contents

    CONTENTS 1. Specifications ......................1 2. Model Numbering System ..................2 (1) LU-2210N/W-7 ..........................2 (2) LU-2212N-7 ..........................3 (3) LU-2260N/W-7 ..........................4 (4) LU-2220N-7 ..........................5 3. Standard Adjustment ....................6 (1) Types and Names of Gradations on the Hand-wheel ............6 (2) Sewing Speed ..........................
  • Page 4 (1) How to replace the Needle Clamp (LU-2260N/W-7) .............. 86 (2) Replacement of the Presser Adjusting Spring ..............88 (3) How to replace the Timing Belt ....................90 (4) How to change from 1-needle to 2-needle specifications (LU-2210N-7 → → → → → LU-2260N-7) ..96...
  • Page 5 6. Bed Height Adjustment..................99 7. Parts to be carefully tightened ................100 8. Parts to be fixed with LOCK-TITE Paint ............101 9. Maintenance Parts List ..................102 10. Mechanism Adjusting Procedure Chart at a Glance ........103 11. Troubles in Sewing and Corrective Measures ..........105 (1) Related to Sewing .........................
  • Page 6 MEMO...

  • Page 7: Specifications

    Oil return flow Circulated with the plunger and felts Lubricating oil JUKI New Defrix Oil No. 1 (Equivalent to ISO VG7) Space under the needle 263.5 mm (Distance from the center of the presser bar to the bottom of the arm)

  • Page 8: Model Numbering System

    2. Model Numbering System (1) LU-2210N/W-7 L U 2 2 1 0 7 0 B – Hook Code Walking Foot Large hook (1.6-fold) Standard Double size hook (2.0-fold) For urethane Right-single-sided foot Presser Foot Left-single-sided foot Standard For piping ø3 For overlapped section For piping ø4 For urethane...

  • Page 9: Lu-2212N-7

    (2) LU-2212N-7 L U 2 2 1 2 N B 7 0 B – Hook Code Walking Foot Large hook (1.6-fold) Standard For urethane Right-single-sided foot Presser Foot Left-single-sided foot Standard For piping ø3 For overlapped section For piping ø4 For urethane For piping ø5 Right-single-sided foot...

  • Page 10: Lu-2260N/W-7

    (3) LU-2260N/W-7 L U 2 2 6 0 7 0 B – Hook Code Stitch Length Code Needle Gauge Code Large hook (1.6-fold hook) 6.0mm Double size hook (2.0-fold hook) 8.0mm 10.0mm Walking Foot, Presser Foot and Feed Dog 12.0mm Standard 20.0mm Option Code...

  • Page 11: Lu-2220N-7

    (4) LU-2220N-7 L U 2 2 2 0 N B 7 0 B – Hook Code Walking Foot Large hook (1.6-fold) Standard For urethane Right-single-sided foot Presser Foot Left-single-sided foot Standard For piping ø3 For overlapped section For piping ø4 For urethane For piping ø5 Right-single-sided foot...

  • Page 12: Standard Adjustment

    3. Standard Adjustment (1) Types and Names of Gradations on the Hand-wheel Standard Adjustment Adjust the timing of each operation of the sewing machine while aligning the upper side of the hand-wheel pointer with the corresponding gradation on the hand-wheel .

  • Page 13: Sewing Speed

    (2) Sewing Speed Standard Adjustment The maximum sewing speed is set according to the sewing conditions as shown in the lists below. Set the maximum sewing speed according to each sewing condition so that the sewing speed does not exceed the set value.

  • Page 14: Needle Entry

    (3) Needle Entry Standard Adjustment 1) Needle entry in the needle slot of the feed dog in the lateral direction Needle Needle entry point The center of the needle slot in the feed dog should be aligned with the center of the needle. Requirements: •...
  • Page 15 Adjustment Procedure Results of Improper Adjustment 1. Set the dial to adjust the amount of alternating the vertical movement 6’ For how to remove or attach the of the walking foot and presser foot to [1] on the scale. aperture plate in LU-2212-N-7 2.

  • Page 16: Needle Entry In The Needle Slot Of The Feed Dog In Feeding Direction (Lu-2210N/W-7, 2260N/W-7, 2212N-7)

    Standard Adjustment 2) Needle entry in the needle slot of the feed dog in feeding direction (LU-2210N/W-7, 2260N-W-7, 2212N-7) • Needle Entry Point The center of the needle slot in the feed dog must align the center of the needle (For the 2-needle type, both the two needles should be applied).
  • Page 17 Adjustment Procedure Results of Improper Adjustment 1. Set the stitch dial to [0] on the scale. o If the needle entry is adjusted too 2. Loosen the aperture plate set screw close to the operator: 3. Remove the aperture plate 1) The needle may interfere with 4.

  • Page 18: Needle Entry In The Needle Slot Of The Feed Dog In Feeding Direction (Lu-2220N-7)

    Standard Adjustment 3) Needle entry in the needle slot of the feed dog in feeding direction (LU-2220N-7) • Needle Entry Point 0.5mm 0.5mm Position where the distance between presser bar and upper feed bar becomes 10.2 ± 0.1mm. • Requirements: •...
  • Page 19 Adjustment Procedure Results of Improper Adjustment 1. Set the stitch dial to [0] on the scale. o If the needle entry is adjusted too 2. Loosen the aperture plate set screw close to the operator: 1) The needle may interfere with 3.

  • Page 20: Needle-To-Hook Relation

    (4) Needle-to-Hook Relation Standard Adjustment 1) Height of the Needle Bar Requirements: The stitch dial should be set to [0]. The needle bar should be brought to the low- est dead point. 2P stitch dial (For LU-2212N-7 and LU-2220N-7) Adjust the height of the needle bar so that a distance of 1.4 ±...
  • Page 21 Adjustment Procedure Results of Improper Adjustment 1. Set the stitch dial to [0] on the scale. o Stitch skipping or thread breakage 2. Turn the hand-wheel to bring the needle bar to the lowest dead may result. point. 4’ At that time, align the bottom face 3.

  • Page 22: Clearance Between The Needle And The Blade Point Of Hook

    Standard Adjustment 2) Clearance between the Needle and the Blade Point of Hook The needle guard The needle guard Blade point of the works. does not work. hook 0.05 to 0.1mm 0 to 0.05mm Gap between the needle and the hook blade point Blade point of the = 0.05 to 0.1 mm...
  • Page 23 Adjustment Procedure Results of Improper Adjustment o If the clearance between the 1. Remove the throat plate. needle and the blade point of the 2. Set the stitch dial to [0] on the scale. hook is too large: 3. Loosen the clamping screw of the hook driving shaft set collar.

  • Page 24: Timing Between The Needle And The Hook

    Standard Adjustment 3) Timing between the Needle and the Hook Align the center of the needle with the blade Graduation [L] on the hand-wheel point of the hook. Requirements: • The hand-wheel pointer should point Graduation [L] on the hand-wheel. •...
  • Page 25 Adjustment Procedure Results of Improper Adjustment o Loose stitches, stitch skipping or 1. Set the stitch dial to [0] on the scale. thread breakage may result. 2. Loosen the set screw of the set collar of the hook driving shaft. 3’...

  • Page 26: Clearance Between The Throat Plate And The Inner Hook Stopper

    (5) Clearance between the Throat Plate and the Inner Hook Stopper Standard Adjustment Throat plate 0.9±0.1mm Inner hook stopper Direction of rotation Inner hook stopper Hook shaft bearing o Hook Shaft Thrust Plate Thickness (mm) Part No. Engraved mark 10111201 10109809 1.6 (Standard) 10112506...
  • Page 27 Adjustment Procedure Results of Improper Adjustment o If the clearance between the throat 1. Select an appropriate thrust plate of the hook shaft and adjust the plate and the inner hook stopper clearance at the thrust plate. is too large: 2.

  • Page 28: Timing Of The Cloth Feed Action

    (6) Timing of the Cloth Feed Action Standard Adjustment 1) Horizontal Feed Timing • Set the stitch dial to the maximum value on the scale. • Align the hand-wheel pointer with the graduation [B] on the handle-wheel. In this state, move the reverse feed lever up and down until the feed dog does not move in the feeding direction.
  • Page 29 Adjustment Procedure Results of Improper Adjustment 1) Horizontal Feed Cam Timing o Improper stitch length may result 1. Loosen the set screws of the bed top cover. when the machine is operated at 2. Remove the bed top cover high-low speed. 3.

  • Page 30: Upper Feed Timing

    Standard Adjustment 3) Upper Feed Timing Set marker dot engraved on the periphery of the main shaft in line with the set screw No. 1 of the upper feed cam and fasten the set screws No. 1 and No. 2. 0.5mm Main shaft –...
  • Page 31 Adjustment Procedure Results of Improper Adjustment 1. Loosen the top cover setscrew. o Improper stitch length may result 2. Remove the top cover. when the machine is operated at 3. Turn the hand-wheel to bring the marker dot engraved on the high/low speed.

  • Page 32: Height Of The Feed Dog

    Standard Adjustment 4) Height of the Feed Dog Height of the feed dog: 0.5 to 0.6 mm Throat plate 0.5 to 0.6mm Requirements: • Set the stitch dial to [6] on the scale. • Align the hand-wheel pointer with the graduation [L] on the hand-wheel.
  • Page 33 Adjustment Procedure Results of Improper Adjustment 1. Set the stitch dial to [6] on the scale. If the height of the feed dog is 2. Slightly loosen the clamping screw of the vertical feed arm. excessive: 3. Align the hand-wheel pointer with the graduation [L] on the hand- o The material may be fed back- wheel.

  • Page 34: Amount Of Alternating Vertical Movement Of The Walking Foot And Presser Foot (Balance Between The Lifting Amounts Of The Presser Foot And Walking Foot)

    Standard Adjustment 5) Amount of alternating vertical movement of the walking foot and presser foot (Balance between the lifting amounts of the presser foot and walking foot) Align the marker dot engraved on the top feed arm with the graduation [L] on the hand- wheel.
  • Page 35 Adjustment Procedure Results of Improper Adjustment 1. Set the stitch dial to the maximum value on the scale. o Improper stitch length may result 2. Set the dial for setting the amount of alternating vertical move- when the machine is operated at ment of the walking foot and presser foot to [1] on the scale.

  • Page 36: Adjustment Of The Feed Mechanism

    (7) Adjustment of the Feed Mechanism Standard Adjustment 1) Zeroing of the feed adjusting mechanism • Align the feed adjusting pin with the sec- tion A of the feed adjusting belt Section A • Make sure that the marking on the feed ad- justing eccentric pin faces in the same direction as the slot in the feed adjustment...
  • Page 37 Adjustment Procedure Results of Improper Adjustment 1. Turn the stitch dial clockwise while moving the reverse feed lever o The actual stitch length will up and down until the feed adjusting pin meets the section A greatly differ from the value set of the feed adjusting belt .

  • Page 38: Stitch Length In The Normal Feed And Reverse Feed

    Standard Adjustment 2) Stitch length in the normal feed and reverse feed Stitch length will change in accordance with the positions of the marking (chamfered section) of the feed adjusting eccentric pin with respect to the slot in the feed adjusting change arm as described below: •...
  • Page 39 Adjustment Procedure Results of Improper Adjustment 1. Set the stitch dial to the maximum value on the scale. o The stitch length specified may 2. Lower the reverse feed lever not be equally obtained in the 3. Slightly loosen the set screw of the feed adjusting eccentric pin normal feed stitching and the reverse feed stitching, resulting...

  • Page 40: Adjustment (For Lu-2212N-7 And Lu-2220N-7)

    Standard Adjustment 3) 2P Adjustment (for LU-2212N-7 and LU-2220N-7) How to zero for the 2P adjustment LU-2212N-7 LU-2220N-7 Point zero (Origin) position Fig. A Fig. B To be matched Fig. C – 34 –...
  • Page 41 Adjustment Procedure Results of Improper Adjustment 1. Remove the belt from the hand-wheel on the machine head. 3’ In some motor versions an 2. Remove the pulley cover from the motor, and then, remove the alarm might sound because belt. they are not equipped with belt 3.

  • Page 42: Position Of The Reverse Feed Connecting Arm/The Amount Of Condensation

    (8) Position of the Reverse Feed Connecting Arm/the amount of condensation Standard Adjustment (LU-2210N/W-7, LU-2260N/W-7 and LU-2212N-7) (LU-2220N-7) 11.5±0.5mm Requirement: • The stitch dial should be set to the maxi- mum value on the scale. – 36 –...
  • Page 43 Adjustment Procedure Results of Improper Adjustment If the clearance between the stopper Reverse Feed Lever Position Adjustment and the reverse feed lever is too 1. Set the stitch dial to the maximum value on the scale. large: 2. Fasten the clamping screw of the reverse feed connection arm.

  • Page 44: Bobbin Winder

    (9) Bobbin Winder Standard Adjustment A : 0.3 to 0.6 (mm) B : 25.5±0.5 (mm) Note that A and B are in the reset state. Bobbin winder unit is in the set state. Bobbin presser spring (Caution) The above figure is illustrated as seen from the rear side of the machine head with the face aperture plate on the front of the...

  • Page 45: Bobbin Winder Friction Wheel Adjustment

    Adjustment Procedure Results of Improper Adjustment 1) Bobbin Winder Friction Wheel Adjustment 3’ For how to remove the aperture 1. Loosen the reverse feed cylinder set screw. (Except for LU-2212N-7 plate of LU-2212N-7 and LU- and LU-2220N-7) 2220N-7, refer to [(17) and (18) 2.

  • Page 46: Thread Trimmer Device (For Lu-2210N/W-7 And Lu-2260N/W-7)

    (10) Thread Trimmer Device (for LU-2210N/W-7 and LU-2260N/W-7) Standard Adjustment 1) Counter Knife 2) Clamp Spring Model Dimension (mm) LU-2210N-7 23.6mm LU-2260N-7 LU-2210W-7 LU-2260W-7 1.5 to 1.7mm Throat plate Counter knife gauge 0.5mm 3) Knife Pressure 4) Moving Knife Driving Arms A, B and C 0.2mm...
  • Page 47 Adjustment Procedure Results of Improper Adjustment o If the dimension is larger: 1) Counter Knife • Knife pressure will be higher. As a 1. Loosen the set screws of the counter knife base r e s u l t , t h e m o t o r m a y b e 2.

  • Page 48: Thread Trimmer Device (For Lu-2212N-7)

    (11) Thread Trimmer Device (for LU-2212N-7) Standard Adjustment 1) Positions of Counter Knife and Clamp Spring 2) Counter Knife Base Position Attach the counter knife and clamp screw while they are contacted onto the staged section of the counter knife base. 4.1±0.1mm    0 –...
  • Page 49 Adjustment Procedure Results of Improper Adjustment o If the distance (17.5 mm) from the top end of the 1) Positions of Counter Knife and Clamp Spring counter knife base to the top end of the counter 1. Loosen the set screws of the counter knife knife is larger than the specified value: 2.
  • Page 50 Standard Adjustment 5) Height of the Moving Knife (LU-2210N/W-7, LU-2212N-7 and LU-2260N/W-7) (for the right-hand side hook) 0.3 to 0.4mm (LU-2212N-7) 0.4 to 0.5mm (LU-2210N/W-7/LU-2260N/W-7) Thread trimmer cam Twist the lead by one turn. – 44 –...

  • Page 51: Height Of The Moving Knife (For The Right-Hand Side Hook) (For Lu-2210N/W-7, Lu-2212N-7 And Lu-2260N/W-7)

    Adjustment Procedure Results of Improper Adjustment o If the clearance between the Height of the Moving Knife (for the right-hand side hook) moving knife and the bobbin case 1. Disconnect the lead wire of the thread trimmer solenoid from is too large: the terminal board •...

  • Page 52: Height Of The Moving Knife (For The Left-Hand Side Hook) (For Lu-2260N/W-7)

    Standard Adjustment 6) Height of the Moving Knife (LU-2260N/W-7) (for the left-hand side hook) 0.4 to 0.5mm – 46 –...
  • Page 53 Adjustment Procedure Results of Improper Adjustment Height of the Moving Knife (for the left-hand side hook) o If the clearance between the 1. Tilt the machine head. moving knife and the bobbin case 2. Loosen the set screws (two pcs.) of the moving knife shaft thrust is too large: collar...

  • Page 54: Thread Trimmer Cam (For Lu-2210N/W-7 And Lu-2260N/W-7)

    Standard Adjustment 7) Thread Trimmer Cam (for LU-2210N/W-7 and LU-2260N/W-7) Thread eyelet of the moving knife Thread (Tetron #8) Front end of the moving knife Graduation [D] on the Hand-wheel Reverse direction Normal Hand-wheel pointer direction – 48 –...
  • Page 55 Adjustment Procedure Results of Improper Adjustment 1. Tilt the machine head and support the head at that position, using o If the timing of thread trimming is the head support bar. too early: 2. Move the moving knife forward by hand until it will go no further. •...

  • Page 56: Thread Trimmer Cam (For Lu-2212N-7)

    Standard Adjustment 8) Thread Trimmer Cam (for LU-2212N-7) Graduation [J] on the hand-wheel Reverse direction Hand-wheel pointer Normal direction Forwarding direction Section R – 50 –...
  • Page 57 Adjustment Procedure Results of Improper Adjustment 1. Tilt the machine head and support the head using the head support 2’ For the marker dot engraved on bar. the hand-wheel, refer to [3.-(1) 2. Align the hand-wheel pointer with the graduation [J] on the hand- T y p e s a n d N a m e s...

  • Page 58: Thread Trimmer Device (Lu-2220N-7)

    (12) Thread Trimmer Device (LU-2220N-7) Standard Adjustment * Before adjusting the area of the thread trimming device, remove covers (face plates (right, left, and front) plus auxiliary cover) from the top surface of the bed. Remove and remount the throat plate, as required. * Adjustments of the thread trimming device shall be carried out according the sequential order instructed in this manual.
  • Page 59 Adjustment Procedure Results of Improper Adjustment 1. Loosen the fixing nut of the thread trimming cylinder joint. 2. Adjust the size of the thread trimming cylinder joint and the thread trimming cylinder to 7.0 ± 0.5mm. 3. Tighten the fixing nut of the thread trimming cylinder joint.

  • Page 60: Counter Knife (Adjustment Of Movement) (Positioning For The Counter Knife Base Stopper)

    Standard Adjustment 2) Counter knife (adjustment of movement) (Positioning for the counter knife base stopper) 37.8±0.1mm Top surface of the bed. Grooves of face plates Contact 9.0±0.5mm – 54 –...
  • Page 61 Adjustment Procedure Results of Improper Adjustment 1. Loosen the setscrew of the counter knife base stopper. 2. Turn the hand wheel by hand and let the sewing machine fall down according to the lower dead point of the thread take-up lever. Loosen the tightening screw of the counter knife driving arm.

  • Page 62: Counter Knife (Adjustment Of Right And Left Positioning)

    Standard Adjustment 3) Counter knife (adjustment of right and left positioning) 2.4±0.15mm When mounting the counter knife , keep it pressed against the counter-worker side and tighten the setscrew. – 56 –...
  • Page 63 Adjustment Procedure Results of Improper Adjustment 1. After the adjustment of the feed dial to [0], turn the hand wheel by hand adjusted to the lower dead point of the thread take-up lever. 2. Actuate the [solenoid valve] manually and move the thread trimming cylinder.

  • Page 64: Moving Knife (Adjustment Of Vertical Positioning)

    Standard Adjustment 4) Moving knife (adjustment of vertical positioning) 0.5 to 0.6mm 5) Counter knife (adjustment of vertical positioning) Coincidence with top surface of the moving knife – 58 –...
  • Page 65 Adjustment Procedure Results of Improper Adjustment 4) Moving knife (adjustment of vertical positioning) 1. Let the sewing machine fall down and loosen the moving knife driving arm tightening screw and the moving knife shaft thrust collar setscrew 2. Move the moving knife vertically so that the gap is adjusted to 0.5 to 0.6mm between the bottom surface (rear side) of the throat plate and the top surface of the moving knife...

  • Page 66: Thread Guide Mounting Position

    Standard Adjustment 6) Thread guide mounting position Coincidence of upper surface with the moving knife 7) Adjustment of knife pressure – 60 –...
  • Page 67 Adjustment Procedure Results of Improper Adjustment 6) Thread guide mounting position 1. Loosen the thread guide setscrew 2. Let the top surface of the thread guide coincide with that of the moving knife and shift it fully in the direction of the arrow specified in the drawing.

  • Page 68: Moving Knife Driving Arm And Initial Position Of The Moving Knife

    Standard Adjustment 8) Moving knife driving arm and initial position of the moving knife Outer periphery of the thread trimming cam Cam groove Top surface of the bed 26.8±0.1mm Face plate groove – 62 –...
  • Page 69 Adjustment Procedure Results of Improper Adjustment 1. Let the sewing machine fall down and manually actuate the [solenoid valve] in the state that no thread trimming cam roller is entered in the cam groove. Assume the condition that the thread trimming air cylinder is protruded.

  • Page 70: Adjustment Of Gap Between The Moving Knife Driving Arm And The Moving Knife Driving Arm Stopper

    Standard Adjustment 9) Adjustment of gap between the moving knife driving arm and the moving knife driving arm stopper 10) Mounting position of the moving knife return plate The return pin and the moving knife return plate shall keep contact with each other.
  • Page 71 Adjustment Procedure Results of Improper Adjustment 9) Adjustment of gap between the moving knife driving arm and the moving knife driving arm stopper 1. While the state of 8), Moving knife driving arm and initial position of the moving knife, is maintained, tighten the moving knife driving arm stopper screw 2.

  • Page 72: Clamp Spring Mounting Position

    Standard Adjustment 12) Clamp spring mounting position Contact When the moving knife advances to the extreme far end, it shall not contact the clamp spring – 66 –...
  • Page 73 Adjustment Procedure Results of Improper Adjustment 1. When the moving knife stays in the initial position, loosen the clamp spring setscrew (When removing the clamp spring setscrew completely, move the moving knife manually. While the hand wheel is turned by hand, the moving knife can be moved after passing the position of the engrave line L.)

  • Page 74: Explanation Of The Solenoid Valve

    Standard Adjustment 13) Explanation of the solenoid valve Information about the solenoid valve manual switch When the switch (in green) is The switch can be locked by turning pressed inside the cover, the the switch in the direction of the arrow s o l e n o i d v a l v e c a n b e while it is kept pressed.
  • Page 75 Adjustment Procedure Results of Improper Adjustment Solenoid valve number Function (symbol) Condensation  Thread trimmer (Cylinder pulled) Thread trimmer return (Cylinder protruded) Needle thread clamp (Cylinder protruded) (Presser foot raised) (Presser foot lowered) (Cylinder protruded) [B], [C] * When the power supply is turned ON, confirm that all solenoid valve covers are closed.

  • Page 76: Opener

    (13) Opener Standard Adjustment 1) Timing of the Opener Graduation [J] on the hand-wheel Throat plate Hand-wheel pointer Backward end of the opener Forward end of Requirements: the opener • For LU-2210N/W-7, LU-2212N-7 and LU-2220N-7 The opener should be brought to its forward end when the hand-wheel pointer meets the graduation [J] on the hand-wheel.
  • Page 77 Adjustment Procedure Results of Improper Adjustment 1) Timing Adjustment of the Opener 1. Loosen the set screws (2 pcs.) of the opener shaft screw gear o Loose stitches may be caused. 2. For LU-2210N/W-7, LU-2212N-7 and LU-2220N-7: Align the hand- 2’...

  • Page 78: Presser Lifting Unit

    (14) Presser Lifting Unit Standard Adjustment 1) Presser Lifting Amount Presser foot Presser foot +1.0 15.5 –0.8 (Automatic) 9.6 ± 1.8 mm (Manual operation) Throat plate Throat plate Presser lifter cam Presser lifter lever Knee lifter spring +1.0 *At the time when the presser foot is lifted by 15.5 –0.8 [As viewed from the Side 2] [As viewed from the Hand-wheel Side]...
  • Page 79 Adjustment Procedure Results of Improper Adjustment 1) Presser Lifting Amount 1. Remove the face plate and the aperture plate 2. Loosen the presser lifting bracket clamping screw and knee lifter arm A clamping screw +1.0 3. Set the height of the presser foot to 15.5 –0.8 4.

  • Page 80: Safety Mechanism

    (15) Safety Mechanism Standard Adjustment 1) Releasing Torque Adjustment Torque = P (N) x L (m) 11.76 to 14.7N•m Standard specification of the releasing torque = (120 to 150kgf•cm) 2) How to reset the Safety Mechanism – 74 –...
  • Page 81 Adjustment Procedure Results of Improper Adjustment o If the releasing torque is set to an 1) Releasing Torque Adjustment Change the pressure of the safety clutch (if the safety clutch is hard to excessively high value: be released or it is released too easily) following the procedure de- •...

  • Page 82: Lubricating Unit

    (16) Lubricating Unit Standard Adjustment 1) Oil Distribution Diagram 2) Supplying and Replacing Oil LU-2210N/W-7, LU-2212N-7, LU-2220N-7 As viewed from side Z To supply oil to the face plate components Oil wick 5 to 7mm LU-2260N/W-7 Return oil wick – 76 –...
  • Page 83 (Caution) When replacing oil, also replace the packing (Part No. RO068190100) for the drain cock and the packing (Part No. 10701209) for the bed top cover with new ones. Be sure not to use any oil other than JUKI New Defrix Oil No. 1. – 77 –...

  • Page 84: Filter Replacement Procedure

    Standard Adjustment 3) Filter Replacement Procedure Set screws Set screws 4) Adjusting the amount of oil in the hook and cleaning the hook filter 25mm A piece Requirement: of paper Operate the sewing ma- chine for 5 seconds at the speed of 3,500 rpm.
  • Page 85 Adjustment Procedure Results of Improper Adjustment 3) Filter Replacement Procedure Remove the magnet and filter element in the filter and wash o If the filter element is clogged them once a month after the first operation of the machine. with dust or the like, a return oil flow may fail.

  • Page 86: Aperture Plate Removal Procedure (For Lu-2212N-7)

    (17) Aperture Plate Removal Procedure (for LU-2212N-7) Standard Adjustment 1) Removal Procedure of Aperture Plate 2) Attachment Procedure of Aperture Plate 3) Adjustment of 2P Cylinder Connecting Link Notch Center of Fulcrum Shaft – 80 –...
  • Page 87 Adjustment Procedure Results of Improper Adjustment 1) Removal Procedure of Aperture Plate 1. Remove the conversion link hinge screw 2. Loosen the set screw (four locations) on the conversion link base and remove the conversion link base 3. Loosen the 2P cylinder set screw and remove the 2P cylinder 4.

  • Page 88: Aperture Plate Removal Procedure (For Lu-2220N-7)

    (18) Aperture Plate Removal Procedure (for LU-2220N-7) Standard Adjustment 1) Removal Procedure of Aperture Plate 2) Attachment Procedure of Aperture Plate 3) Adjustment of 2P Cylinder Connecting Link Notch Center of Fulcrum Shaft – 82 –...
  • Page 89 Adjustment Procedure Results of Improper Adjustment 1) Removal Procedure of Aperture Plate 1. Remove the conversion link hinge screw 2. Loosen the set screw (four locations) on the conversion link base and remove the conversion link base 3. Loosen the 2P cylinder set screw (four locations) and remove the 2P cylinder 4.

  • Page 90: Various Switches

    4. Various Switches Standard Adjustment (1) Operation Switches (LU-2210N/W-7, LU-2260N/W-7) (LU-2220N-7) (LU-2212N-7) Example • Needle thread clamp switch • Pressing the knee switch changes the • Set the 2P stitch dial to “6” on the scale. (LU-2220N-7) stitch length from “9” to “6”. •...
  • Page 91 Adjustment Procedure Results of Improper Adjustment (1) Operation Switches 1) One-touch type reverse feed switch In the sewing machine operation, reverse feed stitching is performed during the pressing of this switch. When the switch is released, nor- mal feed stitching is returned. 2) Altemating vertical movement amount change-over switch for the amount of alternating vertical movement of the walking foot and the presser foot...

  • Page 92: Parts Replacement

    5. Part Replacement (1) How to replace the Needle Clamp (LU-2260N/W-7) Assembling and Disassembling Procedure Tapped hole for thread take-up lever cover set screw Hole for pulling out the needle bar Hole for presser adjusting dial (As viewed from side A) Cross Section of Connecting Portion –...
  • Page 93 Assembling and Disassembling Procedure Results of Improper Adjustment 1. Remove the presser adjusting dial and the thread take-up lever cover 2. Loosen the clamping screw of the needle clamp (assembly) through the hole for pulling out the needle bar with the hexagon wrench supplied with the machine and remove the needle clamp (assembly) 3.

  • Page 94: Replacement Of The Presser Adjusting Spring

    (2) Replacement of the Presser Adjusting Spring Assembling and Disassembling Procedure Presser adjusting spring Diameter 10718302 ø1.4 10715902 ø1.8 10717007 ø2.0 o For LU-2210N/W-7, LU-2212N-7 and LU-2220N-7, ø1.8 is the standard. Other are optional. o For LU-2260N/W-7, ø2.0 is the standard. Others are op- tional.
  • Page 95 Assembling and Disassembling Procedure Results of Improper Adjustment 1. Remove the presser adjusting dial , and lower the presser foot o When the presser adjusting spring 2. Remove the presser adjusting spring (assembly) is replaced, the above steps 3 3. Remove the spring pin (upper) and the snap ring (E-ring) .

  • Page 96: How To Replace The Timing Belt

    (3) How to replace the Timing Belt Assembling and Disassembling Procedure – 90 –...
  • Page 97 Assembling and Disassembling Procedure Results of Improper Adjustment 3’ Refer to [3-(17) and (18) 1. Remove the timing belt from the lower sprocket A p e r t u r e P l a t e R e m o v a l 2.
  • Page 98 Assembling and Disassembling Procedure (For LU-2212N-7 and LU-2220N-7) A clearance of 1 mm should be provided between the spring rack hook and the end face of the feed adjust- ing arm (For LU-2212N-7 and LU-2220N-7) – 92 –...
  • Page 99 Assembling and Disassembling Procedure Results of Improper Adjustment 11. Loosen the clamping screws of the feed adjusting arm 11’ Insert the screwdriver from the aperture plate side. and the feed adjusting pin support arm (For LU-2212N-7 and 12’ Insert the screwdriver from the LU-2220N-7).
  • Page 100 Assembling and Disassembling Procedure When the timing belt is put on the lower sprocket , take care to set the correct timing between the needle and the hook. After the timing belt has been properly set on the machine, check the [Timing between the needle and the hook], [Feed rock timing], [Feed driving timing] and [Height of the feed dog].
  • Page 101 Assembling and Disassembling Procedure Results of Improper Adjustment 26. Hang the timing belt on the upper and lower sprockets . At 27’ R e f e r t o [ 3 - ( 4 ) - 3 ) T i m i n g that time, do not change the needle-to-hook timing while the timing between the Needle and the belt...

  • Page 102: How To Change From 1-Needle To 2-Needle Specifications (Lu-2210N-7 → → → → → Lu-2260N-7)

    (4) How to change from 1-needle to 2-needle specifications (LU-2210N-7 → → → → → LU-2260N-7) Assembling and Disassembling Procedure Hook shaft saddle (left) set Filter (For lubrication) Face aperture plate – 96 –...
  • Page 103 Assembling and Disassembling Procedure 1. Remove the sliding plate (right) and (left) and the needle. Then, tilt the machine head. 2. Loosen the clamping screw of the hook driving shaft set collar. 3. Loosen the set screws (2 pcs.) of the hook driving shaft coupling (left) and pull out the hook driving shaft B. 4.
  • Page 104 List of the Parts to be changed When the mode is changed from 1-needle to 2-needle, perform the changing work according to the unit as the part No. of the unit for mode change have been set. List of Unit for mode change Part No.

  • Page 105: Bed Height Adjustment

    6. Bed Height Adjustment Standard Adjustment When the sewing machine head is installed on the sewing machine table in the standard state, the top surface of the sewing machine bed is 2 mm higher than the top surface of the table as illus- trated in the figure on the left.

  • Page 106: Parts To Be Carefully Tightened

    7. Parts to be carefully tightened The following parts will break if they are excessively tightened. So, fasten the screws carefully in the respective parts. Part No. Part Name Part No. Part Name 10718104 Feed rock shaft clank 10727808 Moving knife driving arm B 10729705 Presser lifter arm 10728103...

  • Page 107: Parts To Be Fixed With Lock-Tite Paint

    8. Parts to be fixed with LOCK-TITE Paint The following parts are fixed with “LOCK-TITE” paint. When these parts are disassembled, remove residual paint thoroughly using pint thinner and assemble them applying “LOCK-TITE” after removing any moisture from the surface. If the screw which has been fixed with “LOCK-TITE”...

  • Page 108: Maintenance Parts List

    9. Maintenance Parts List Basic Maintenance Parts Part No. Part Name Specifications Instruction in attachment MC321001400 Needle 134 x 35R (Standard: Nm 140) 2210N-7/2212N-7/2210W-7/2220N-7 Selection: • Orientation of the Needle • Refer to [3.-(4)-2) Clearance between MC321001402 Needle 134 x 35R (Standard: Nm 140) 2260N-7/2260W-7 (2-needle) the Needle and the Blade Point of Hook] and [3.-(4)-3) Timing between...

  • Page 109: Mechanism Adjusting Procedure Chart At A Glance

    10. Mechanism Adjusting Procedure Chart at a Glance When adjusting the items 1) through 8), also adjust the related components according to the arrows. [3.-(4)-2) Clearance between the Needle and the [3.-(4)-3) Timing between the Needle and the Hook] Blade Point of Hook] [3.-(5) Clearance between the Throat Plate and the [3.-(4) 2) Clearance between the Needle and the Inner Hook Stopper]...
  • Page 110 [5.-(3) How to replace the Timing Belt] [3.-(4)-3) Timing between the Needle and the Hook] [3.-(6)-1) Horizontal Feed Timing] [3.-(6)-2) Vertical Feed Timing] [3.-(6)-4) Height of the Feed Dog] [5.-(1) How to replace the Needle Clamp] [3.-(3) Needle Entry] [3.-(4)-2) Clearance between the Needle and the Blade Point of Hook] [3.-(4)-3) Timing between the Needle and the Hook] [3.-(5) Clearance between the Throat Plate and the...

  • Page 120: Replaceable Gauge Table

    12. Replaceable Gauge Table (1) For LU-2210N/W-7, LU-2212N-7, and LU-2220N-7 Walking Foot 10711653 10711752 10711851 10711950 ø3 10745354 ø3 10746352 10712354 10712057 N o n - g r o o v e ø4 10745453 ø4 10746451 type ø5 10745552 ø5 10746550 ø6 10745651 ø6 10746659 Presser Foot Standard...
  • Page 121 Feed dog: For LU-2210N/W-7 and LU-2212N-7 3.3mm 3.3mm 3.3mm 2.5mm 1.6mm 2.2mm 2.2mm 2.2mm 10717106 10717205 10717304 10739001 Standard Without groove For thin threads. Wide type To be used when the needle thread and the bobbin thread do not smoothly interlace with each other at the start of sewing.

  • Page 123: Machine Head Wiring (With Thread Trimmer Only)

    13. Machine head wiring (with thread trimmer only) (1) Connector from the machine head (LU-2210N/W-7, LU-2260N/W-7 (other than LU-22*0*-0-*-0B) • 12-pin connector • 16-pin connector (4-gang switch) Pin No. Function Pin No. Function Thread trimming (–) BT SW Thread tension release (–) NU SW +12V DL SW...

  • Page 124: Connector From The Machine Head (For Lu-2210N/W-7, Lu-2260N/W-7 (Lu-22*0*-0-*-0B)

    (3) Connector from the machine head (For LU-2210N/W-7, LU-2260N/W-7 (LU-22*0*-0-*-0B) • 12-pin connector • 16-pin connector (4-gang switch) Pin No. Function Pin No. Function Thread trimming (–) BT SW Thread tension release (–) NU SW DL (–) 2P (–) Thread trimming (+) BT (–) Thread tension release (+) FL (–)

  • Page 125: Connector From The Machine Head (Lu-2212N-7)

    (5) Connector from the machine head (LU-2212N-7) • 12-pin connector • 16-pin connector (4-gang switch) Pin No. Function Pin No. Function Thread trimming (–) BT SW Thread tension release (–) NU SW +12V DL SW DL LED (–) DL Limit2 & Speed Limit DL (–) 2P (–) Thread trimming (+)

  • Page 126: Connector From The Machine Head (Lu-2220N-7)

    (7) Connector from the machine head (LU-2220N-7) • 12-pin connector • 16-pin connector (5-gang switch) Pin No. Function Pin No. Function BT SW Thread tension release (-) NU SW +12V DL SW DL LED (–) DL Limit2 & Speed Limit DL (–) 2P (–) BT (–)

  • Page 127: Timing Chart

    Main shaft angle 130° 12° 65° 75° 120° 160° 60° 100° SY-2 detection DOWN stop detection UP stop detection LU-2210N-7 LU-2260N-7 120° 155° Needle thread trimmer 35° 60° (Start of UP stop detection) 290° Tension release 130° (End of DOWN...

  • Page 128: Table Dimension Diagram

    2-ø3.5, depth 10 *3.5, depth 10 2-ø3.4, depth 10 (On the bottom surface) Logo designated by JUKI (using supplied block print) ø6, depth 10 (On the bottom surface) Detailed Dimension Drawing (2:1) Style of type: Helvetics Reg. Condensed: Voided letters Thickness: 1.5...
  • Page 129 Juki Corporation operates an environmental management system to promote and conduct the following as the company engages in the research, development, design, sales, distribution,and maintenance of industrial sewing machines, household sewing machines, industrial robots, etc., and in the provision of sales and maintenance services...

This manual is also suitable for:

Lu-2210w-7Lu-2212n-7Lu-2260w-7Lu-2260n-7Lu-2220n-7

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