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JUKI NA-11UT Series Service Manual

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NA-11UT Series
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Summary of Contents for JUKI NA-11UT Series

  • Page 1 NA-11UT Series Service manual...

  • Page 2: Table Of Contents

    CONTENTS 1. JAM ･ CLEARANCE ..................8 1-1. Needle Bar Jam ...................... 8 1-2. Thread Take-up Lever Clearance ................ 10 2. FEED TIME ....................12 2-1. Adjusting the Height of the Feed Dog ..............12 2-2. The Up/Down Motion Adjusting Shaft Setting ........... 14 2-3.
  • Page 3 6. OIL SUPPLY ..................... 43 6-1. Oil Supply ......................43 6-2. Adjusting the Oil Supply Volume for the Thread Take-up ........ 45 6-3. Adjusting the Oil Supply to the Hook ..............46 7. SOLENOID ....................47 7-1. Thread Trimming Solenoid .................. 47 8.

  • Page 4: Jam Clearance

    CLEARANCE Needle Bar Jam ¡ Loosen the screw for the face plate and disassemble the fact plate from the arm. [Fig. 1] Loosen the fixing screw for the needle and disassemble the needle from the needle bar. [Fig. 2] Disassemble the needle bar thread guide from the needle bar.
  • Page 5 Jam Clearance Loosen the fixing screw for the needle bar. Move the needle bar up and down to check the jam. [Fig. 4] If the needle bar is stuck, remove the rubber cap of the needle bar upper bushing. [Fig. 5] Disassemble the needle bar in the direction of the upper bushing and replace it with a new SunStar needle bar.

  • Page 6: Thread Take-Up Lever Clearance

    Thread Take-up Lever Clearance ¡ ¢ Loosen the screw for the face plate and disassemble the face plate. [Fig. 1] Remove the rubber cap from the arm hole. Insert the driver to loosen the screw for the thread take-up lever hinge pin by turning it full circle.
  • Page 7 Jam Clearance Manually turn the pulley to check whether there is no jam and it operates smoothly. Make the assembly in the reverse order of the disassembly. [Fig. 5] Maintenance Book...

  • Page 8: Feed Time

    FEED TIME Adjusting the Height of the Feed Dog ¢ ¡ Turn the dial in the direction of the arrow and set it at the maximum stitch length. Max. stitch length: [Fig. 1] Lay down the machine and loosen the screw for the feed lift shaft crank (ass’y) .
  • Page 9 Feed Time Tightly tighten the screw for the feed lift shaft crank (ass y) . [Fig. 4] Maintenance Book...

  • Page 10: The Up/Down Motion Adjusting Shaft Setting

    The Up/Down Motion Adjusting Shaft Setting ¢ ¡ ¢ [Fig. 1] [Fig. 2] [Fig. 3] [Fig. 4]...
  • Page 11 Feed Time [Fig. 5] Maintenance Book...

  • Page 12: The Presser Foot Setting

    The Presser Foot Setting ¢ ¡ £ Turn the presser foot lifter in the direction of the arrow to lift the presser foot. [Fig. 1] Loosen the screw for the main presser foot and disassemble the presser foot [Fig. 2]  for the presser bar holder.
  • Page 13 Feed Time Turn the pulley to set the needle bar at the highest point. [Fig. 5] Loosen the screw for the auxiliary presser foot up/down motion crank. [Fig. 6] Adjust the height of the auxiliary presser foot to be 3mm from the upside face of the needle plate.
  • Page 14 Adjust the height of the auxiliary presser foot at 3mm, and tighten the up/down crank screw . [Fig. 8]...

  • Page 15: The Feed Cam And Presser Foot Up/Down Motion Cam Setting

    Feed Time The Feed Cam and Presser Foot Up/Down Motion Cam Setting Disassemble the top cover . [Fig. 1] ¥ ¦ § ¨ § © ¥ § ¥ ¦ § ¨ ¦ © § © ¦ § ¦ § ¥ ¥...

  • Page 16: Adjusting The Motion Range Of The Feed Dog

    Adjusting the Motion Range of the Feed Dog Lift the presser foot by turning the presser bar lifter . [Fig. 1] Turn the dial in the direction of the arrow and set the stitch length at the maximum level ( mm). [Fig.
  • Page 17 Feed Time Tighten the screw for the feed dog support crank. [Fig. 5] Maintenance Book...

  • Page 18: Adjusting The Balance Of The Feed Dog

    Adjusting the Balance of the Feed Dog Loosen the fixing screw for the feed dog support shaft. [Fig. 1] When the feed dog is at the highest position, turn the feed dog turning shaft to make the upside face of the feed dog horizontal with the needle plate.

  • Page 19: Thread Trimming Time

    THREAD TRIMMING TIME The Thread Bar Highest/Lowest Stop Position Setting Press the switch and check the highest/lowest stop position. Highest stop position: Press the switch once. Lowest stop position: Press the switch twice in a row. [Fig. 1] 上停针位功能开启。 Whether or not the position of arrow 2 is displayed, shown as open.
  • Page 20 The highest stop position of the needle bar should be 1mm below than the highest point of the thread take-up lever. [Fig. ]...

  • Page 21: Replacement Of The Mes And The Setting

    Thread Trimming Time Replacement of the Mes and the Setting Press the slide in the direction of the arrow and disassemble it. Loosen the screw and disassemble the needle plate. [Fig. 1] Loosen the screw of the presser foot and disassemble the presser foot [Fig.
  • Page 22 When the thread take-up lever is at the lowest point, push the thread trimming solenoid con into the direction of the housing . Slowly turn the pulley and check the overlapped portion of the moving mes and the fixed mes. [Fig.
  • Page 23 Thread Trimming Time direction : The overlapped part gets bigger, direction : The overlapped park gets smaller. [Fig. 9] Loosen the hook holder screw and disassemble the hook holder . [Fig. 10] Loosen the screw for the fixing mes and replace it. [Fig.
  • Page 24 Loosen the nut . Turn the tension adjusting screw to adjust the tension and then tighten the nut. [Fig. 13] Use the two three-string nylon strands to conduct thread trimming test, and check whether the mes is properly returned to its original position.

  • Page 25: The Thread Retainer Setting

    Thread Trimming Time The Thread Retainer Setting Loosen the fixing screw for the thread retainer. [Fig. 1] Move the thread retainer up and down to make sure that the moving mes and the hook don t interfere with each other and then tightly tighten the fixing screw .

  • Page 26: The Thread Trimming Cam Setting

    The Thread Trimming Cam Setting When the thread take-up lever is at the lowest point, push the thread trimming solenoid corn in the housing direction. Manually turn the pulley and check whether the moving messtarts moving when the thread take-up lever is 1mm above the lowest point. [Fig.

  • Page 27: Bad Sewing

    BAD SEWING Hook Time Disassemble the slide plate by pushing it in the direction of the arrow. Loosen the screw for the needle plate and disassemble the needle plate. [Fig. 1] Loosen the screw for the presser foot and disassemble the presser foot .
  • Page 28 Manually turn the pulley to locate the needle bar at the lowest point. Loosen the screw of the needle bar. [Fig. 4] Move the needle bar② up and down, ② 记号刻度线 至和轴套① 缘 时， 时对准第 刻度线 用DB×1时对准第三刻度线 [Fig. 5] Loosen the screw (2EA) for the hook. [Fig.
  • Page 29 Bad Sewing Set the distance between the needle and the hook point at 0.05~0.1mm. [Fig. 10] Tightly tighten the screw (2EA) for the hook and auxiliary screw [Fig. 11] Maintenance Book...

  • Page 30: Placing The Upper Thread

    Placing the Upper Thread The upper thread is placed following the order below: Place the thread take-up lever at the highest point and the thread guide with three holes Sub upper thread tension control device Thread tension control device Thread guide plate Arm thread guide Thread take up lever Thread guide for the face plate...

  • Page 31: Adjusting The Tension Of The Upper Thread

    Bad Sewing Adjusting the Tension of the Upper Thread When the adjusting nut of the thread tension control device is turned clockwise, the upper thread tension gets stronger. When it is turned counter-clockwise, the upper thread tension gets weaker. [Fig. 1] Insert the driver into the groove of the thread tension control device shaft and turn it clockwise and then the tension of the...

  • Page 32: Adjusting The Tension Of The Presser Foot

    Adjusting the Tension of the Presser Foot Loosen the nut  and turn the screw  for the presser foot to adjust the pressure of the presser foot. 脚 [Fig. 1] When the screw is turned clockwise, the pressure of the main presser foot gets stronger.

  • Page 33: Adjusting The Tension Of The Lower Thread

    Bad Sewing Adjusting the Tension of the Lower Thread Push the bobbin case removal lever in the arrow direction and disassemble the bobbin case. [Fig. 1] When removing or placing back the bobbin case, make sure that it doesn t negatively affect the lever . [Fig.

  • Page 34: Noise

    NOISE Upper Shaft Collar Clearance Hold the pulley by hand and slightly shake it in the direction of the arrows to check where there is clearance in the upper shaft. [Fig. 1] If there is clearance in the upper shaft, disassemble the top cover [Fig.
  • Page 35 Noise Pull the pulley in the direction of the arrow and put the upper shaft collar closely to the bushing and then tighten the screw of the upper shaft collar. Tighten the first screw from the revolving direction of the upper shaft and then the second screw. [Fig.

  • Page 36: Standing Shaft Clearance

    Standing Shaft Clearance Disassemble the rear cover . [Fig. 1] Slightly move the upright shaft upper gear up and down, and check the clearance of the upright shaft. [Fig. 2] If it is confirmed that there is clearance in the upright shaft, loosen the screw of the upright shaft upper gear by turning it full circle.
  • Page 37 Noise Place the upright shaft upper gear close to the bushing. Tighten the first screw from the revolving direction of the upright shaft cutting part and then the second screw. [Fig. 5] Manually turn the pulley and check whether there is clearance or jam.

  • Page 38: Lower Shaft Clearance

    Lower Shaft Clearance Hold the lower shaft and slightly move it in the arrow direction to check the clearance. [Fig. 1] If there is clearance in the lower shaft, loosen the lower shaft collar screw . [Fig. 2] Place the lower shaft gear toward the lower shaft rear bushing [Fig.

  • Page 39: Oil Supply

    OIL SUPPLY Oil Supply Loosen the screw of the oil fan. Remove the polluted oil or foreign materials and tightly tighten the screw. [Fig. 1] Fill the original SunStar oil up to the HIGH mark . If the oil volume is below the LOW mark , it can cause machine problems.
  • Page 40 Make a test sewing at the speed of 2000spm for 10 minutes and check whether oil is sprayed to the oil window. [Fig. 4]...

  • Page 41: Adjusting The Oil Supply Volume For The Thread Take-Up

    Oil Supply Adjusting the Oil Supply Volume for the Thread Take-up Disassemble the face plate. [Fig. 1] [Fig. 2] Maintenance Book...

  • Page 42: Adjusting The Oil Supply To The Hook

    Adjusting the Oil Supply to the Hook Lay down the arm bed toward the hinge. Turn the oil supply adjusting screw clockwise and the oil supply volume to the hook increases. [Fig. 1] Turn the oil supply adjusting screw counter-clockwise and the oil supply volume to the hook decreases.

  • Page 43: Solenoid

    SOLENOID Thread Trimming Solenoid The motion range of the thread trimming solenoid is 4~5mm. [Fig. 1] Loosen and turn the nut . When the nut is moved in the direction, the motion range gets bigger. When it is moved in the direction, the motion range gets smaller.
  • Page 44 Loosen the screw for the thread trimming solenoid bracket. [Fig. 4] Manually move the thread trimming solenoid corn back and forth and find the place where it can operate most smoothly. [Fig. 5] Tightly tighten the screw for the thread trimming solenoid base. [Fig.

  • Page 45: Adjusting The Forward/Backward Stitch Length

    ADJUSTING THE FORWARD/BACKWARD STITCH LENGTH Adjusting the Delicate Adjusting Shaft Loosen the screws and disassemble the bartacking solenoid cover. [Fig. Loosen the screw A of feed adjusting shaft by turning it full circle. [Fig. 使用扳手上下旋转调整偏心调节销B。 [Fig. ] Maintenance Book...
  • Page 46 Adjusting the Forward/Backward Stitch Length Place the test paper inside the presser foot and make the forward sewing and backward sewing to check whether the forward and backward sewing have identical stitch length. [Fig. 9]...

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