Janome MyLock 744 Servicing Manual
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Janome MyLock 744 Servicing Manual

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SERVICING MANUAL

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Summary of Contents for Janome MyLock 744

  • Page 1 SERVICING MANUAL...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS TO CHANGE THE FACE PLATE UNIT ....................... 1 TO CHANGE THE BELT COVER ....................... 2 TO CHANGE THE TOP COVER UNIT ....................... 3 TO CHANGE THE FRONT COVER UNIT ....................4 TO CHANGE THE FREE ARM COVER UNIT .................... 5 TO CHANGE THE MACHINE BASE ......................

  • Page 3: To Change The Face Plate Unit

    TO CHANGE THE FACE PLATE UNIT To remove: 1. Loosen the setscrew A and remove the face plate unit. To attach: 2. Fit the U-groove of the face plate between the setscrew A and set plate, put the ribs of face plate into the front cover unit, back cover unit and tighten the setscrew.

  • Page 4: To Change The Belt Cover

    TO CHANGE THE BELT COVER To remove: 1. Loosen setscrew A and remove the setscrew B. 2. Remove the belt cover. To attach: 3. Put the ribs of belt cover into the front cover unit and back cover unit and tighten setscrews A and B.

  • Page 5: To Change The Top Cover Unit

    TO CHANGE THE TOP COVER UNIT To remove: 1. Loosen two setscrews A and remove the top cover unit. To attach: 2. Put the ribs in the front cover unit. 3. Tighten two setscrews A. Setscrews A Top cover unit Front cover unit...

  • Page 6: To Change The Front Cover Unit

    TO CHANGE THE FRONT COVER UNlT To remove: 1. Remove the setscrews A and looper cover unit. 2. Remove the topcover unit. 3. Move the upper looper to its lowest point by turning the handwheel in counter clockwise. 4. Loosen the setscrew B and remove the setscrews C and D and remove the front cover unit. To attach: 5.

  • Page 7: To Change The Free Arm Cover Unit

    TO CHANGE THE FREE ARM COVER UNIT To remove: 1. Loosen setscrews A and remove the free arm cover unit. To attach: 2. Put the ribs of free arm cover into back cover. 3. Tighten the setscrews A. Free arm cover unit Setscrews A...

  • Page 8: To Change The Machine Base

    TO CHANGE THE MACHINE BASE To remove: 1. Remove set screws A, B and four hinge screws C and remove four base cushions D and washers. 2. Remove the machine base unit. To attach: 3. Attach the machine base and the four base cushions D, washers, and tighten hinge screws C. 4.

  • Page 9: To Change The Machine Socket

    TO CHANGE THE MACHINE SOCKET To remove: 1. Remove the belt cover. 2. Remove setscrews (A, B) and the machine socket unit from the motor fixing plate. 3. Remove two setscrews C and pull out the cord connectors. To attach: 4.

  • Page 10: To Adjust The Needle Height

    TO ADJUST THE NEEDLE HEIGHT Correct Setting: The distance between the tip of needle on the right and the surface of needle plate should be 11.6 to 12.2 mm when the needle bar is at the highest position. To adjust: 1.

  • Page 11: To Adjust The Presser Bar Height

    TO ADJUST THE PRESSER BAR HElGHT Correct Setting: The distance between the surface of needle plate and bottom of presser foot should be 4.7 to 5.3 mm when the presser bar lifter is raised. To adjust: 1. Remove the looper cover unit, top cover unit and front cover unit. 2.

  • Page 12: To Adjust The Feed Dog Height

    TO ADJUST THE FEED DOG HEIGHT Correct Setting: When the presser foot is lowered and the feed dogs are at their highest position, the distance between the surface of needle plate and bottom of presser foot should be 0.75 to 0.95 mm. To adjust: 1.

  • Page 13: To Adjust The Timing Of The Needle And The Feed Dog

    TO ADJUST THE TIMING OF THE NEEDLE AND THE FEED DOG Correct Setting: When the tip of right needle is at 2 to 4 mm above the needle plate in its downward motion and presser foot lowered, the top of the feed dog teeth should be level with the top surface of needle plate at their rearmost position.

  • Page 14: To Adjust The Timing Of The Needle And The Upper Knife

    TO ADJUST THE TIMING OF THE NEEDLE AND THE UPPER KNIFE Correct Setting: The upper knife timing is the same as that of the needle bar. In fact, when the needle bar is at highest position, the upper knife should be also at its highest position. To adjust: 1.

  • Page 15: To Adjust The Clearance Between The Needles And The Lower Looper/Needle Guards

    TO ADJUST THE CLEARANCE BETWEEN (1 of 3) THE NEEDLES AND THE LOWER LOOPER/NEEDLE GUARDS Correct setting: Both right and left needles should have an equal clearance from the front edge of the needle hoIes on the needle plate. The standard clearance between the Ieft and right needle and the lower looper is 0 mm to 0.05 mm. The standard clearance between the needles and the rear needle guard is 0 mm to 0.2 mm.
  • Page 16 TO ADJUST THE CLEARANCE BETWEEN (2 of 3) THE NEEDLES AND THE LOWER LOOPER/NEEDLE GUARDS 1. Remove the left needle only. 2. Turn the handweel toward you to bring the tip of the lower looper from the left hand to the rear side of the right needle.
  • Page 17 TO ADJUST THE CLEARANCE BETWEEN (3 of 3) THE NEEDLES AND THE LOWER LOOPER/NEEDLE GUARDS 1. Change the right needle from #11 to #14. 2. Push the right needle by the front needle guard to adjust the cIearance between the needle and the lower looper.
  • Page 18 TO ADJUST THE CLEARANCE BETWEEN THE NEEDLES AND THE FIXED NEEDLE GUARD Correct Setting: The clearance between needles and the fixed needle guard should be 0.1 to 0.4 mm. To adjust: 1. Remove the free arm cover unit, presser foot and the needle plate and lower the needle to its lowest position.

  • Page 19: To Adjust The Position Of The Chaining Finger

    TO ADJUST THE POSITlON OF THE CHAINING FINGER Correct Setting: When set the needle plate setting knob to guide line S, chaining finger should touch side of needle plate, and tip of chaining finger should be same level with the tip of the needle on the needle plate.

  • Page 20: To Adjust The Position Of The Upper Looper

    TO ADJUST THE POSITION OF THE UPPER LOOPER Correct setting: When the upper looper is at the leftmost position, the distance between the center of needle on the right and the center of looper eye should be 4.8 to 5.2 mm. To adjust: 1.

  • Page 21: To Adjust The Timing Of The Needle And The Lower Looper

    TO ADJUST THE TIMING OF THE NEEDLE AND THE LOWER LOOPER Correct setting: When the needle comes up 2.8 to 3.2 mm (7/64 to 1/8”) from its lowest position, the tip of the lower looper comes just left of the needle (#11) on the right. To adjust: 1.

  • Page 22: To Adjust The Timing Of The Upper And Lower Loopers

    TO ADJUST THE TIMING OF THE UPPER AND LOWER LOOPERS Correct Setting: When the lower looper moves to the right, the tip of upper looper meets the lower looper within 0.2 to 1.2 mm from the left of lower looper eye as shown in Drawing 1. To adjust: 1.

  • Page 23: To Adjust The Clearance Between The Loopers

    TO ADJUST THE CLEARANCE BETWEEN THE LOOPERS Correct Setting: When the upper and lower loopers meet as shown in Drawing 2, the clearance should be 0 to 0.2 mm as shown in Drawing 1. To adjust: 1. Remove the spreader setscrew A and the spreader holding plate. 2.

  • Page 24: To Adjust The Clearance Between The Needle And The Upper Looper

    TO ADJUST THE CLEARANCE BETWEEN THE NEEDLE AND THE UPPER LOOPER Correct Setting: When the upper looper meets with needle, the clearance should be: 0 to + 0.1 mm at the needle on the left. - 0.05 to + 0.05 mm at the needle on the right. To adjust: 1.

  • Page 25: To Adjust The Position Of The Knlves

    TO ADJUST THE POSlTlON OF THE KNIVES Correct Setting: * The tip of the lower knife should be leveled with the surface of needle plate. When the upper knife is at the lowest position, the front lower corner of the upper knife should be 0.8 to 1.5 mm beIow the edge of the lower knife.

  • Page 26: To Adjust The Position Of The Looper Thread Gulde

    TO ADJUST THE POSITION OF THE LOOPER THREAD GUIDE Looper thread guide Loosen setscrew A and swing the looper thread guide up or down to match the bottom edge of both looper thread guide and upper looper drive arm as shown in Drawing 1. Tighten the setscrew A to secure the position.

  • Page 27: To Adjust The Stitch Length

    TO ADJUST THE STITCH LENGTH Correct Setting: The actual stitch length should be 2.8 to 3.0 mm when the stitch length dial is set at “3” and differential feed dial at “1.0 “. To adjust: 1. Set the stitch length dial at “3 “ and the differential feed dial at “1.0 “. 2.

  • Page 28: To Adjust The Thread Tension Dials

    TO ADJUST THE THREAD TENSlON DIALS To check: Thread tension dials are already adjusted for general sewing at factory, however, if you want much stronger or weaker tension settings for special sewing needs, it can be adjusted as follows: Adjustment procedure: 1.

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