Janome MYLOCK 454D Service Manual
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Janome MYLOCK 454D Service Manual

Janome MYLOCK 454D Service Manual

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1st Edition: 08 November 2024
SERVICE MANUAL
MODEL: MYLOCK 454D

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Summary of Contents for Janome MYLOCK 454D

  • Page 1 1st Edition: 08 November 2024 SERVICE MANUAL MODEL: MYLOCK 454D...

  • Page 2: Table Of Contents

    CONTENTS CHANGING EXTERNAL PARTS FACE PLATE ......................1 REAR COVER ......................2 TOP COVER ......................3 LOOPER COVER ....................4 FRONT COVER ...................... 5 SIDE COVER ......................6 BASE PLATE ......................7 CHANGING ELECTRONIC COMPONENTS MACHINE SOCKET ....................8 MECHANICAL ADJUSTMENT MOTOR BELT TENSION ..................

  • Page 3: Changing External Parts

    CHANGING EXTERNAL PARTS FACE PLATE To remove: 1. Remove the setscrew and the face plate. To attach: 2. Tighten the setscrew. Fit the U-groove of the face plate between the setscrew and set plate, put the ribs of face plate into the front cover, rear cover and tighten the setscrew. Front cover Rear cover Setscrew...

  • Page 4: Rear Cover

    CHANGING EXTERNAL PARTS REAR COVER To remove: 1. Remove setscrews A (2 pcs.) and the spool stand. 2. Remove setscrews B, C, D and E. 3. Open the side cover. 4. Unhook the ribs from the machine and remove the rear cover. To attach: 5.

  • Page 5: Top Cover

    CHANGING EXTERNAL PARTS TOP COVER To remove: 1. Remove the rear cover (see page 2). 2. Loosen setscrews (2 pcs.) and remove the top cover. To attach: 3. Put the ribs of the top cover in the front cover. 4. Tighten the setscrews (2 pcs.). 5.

  • Page 6: Looper Cover

    CHANGING EXTERNAL PARTS LOOPER COVER To remove: 1. Remove setscrews A (2 pcs.) and the looper cover. To attach: 2. Attach the looper cover with setscrews A (2 pcs.). Looper cover Setscrew A...

  • Page 7: Front Cover

    CHANGING EXTERNAL PARTS FRONT COVER To remove: 1. Remove the face plate, rear cover, top cover and looper cover (see pages 1 to 4). 2. Turn the handwheel toward you with your hand, and set the upper looper at its lowest position, and remove setscrews A, B, C, D.

  • Page 8: Side Cover

    CHANGING EXTERNAL PARTS SIDE COVER To remove: 1. Open the side cover. Remove the snap ring. Push down the shaft and remove the side cover. To attach: 2. Set the side cover to the rear cover. Insert the shaft and attach the snap ring. Close the side cover. Side cover Shaft Snap ring...

  • Page 9: Base Plate

    CHANGING EXTERNAL PARTS BASE PLATE To remove: 1. Remove the looper cover (see page 4). 2. Open the side cover. 3. Remove setscrews A, B, C, D, washers (black/silver), rubber cushions (2 pcs.), bushing (2 pcs.) and setscrew E (2 pcs.). 4.

  • Page 10: Replacing Electronic Components

    REPLACING ELECTRONIC COMPONENTS MACHINE SOCKET To remove: 1. Remove the face plate, rear cover, top cover, looper cover and front cover (see pages 1 to 5). 2. Remove setscrews (2 pcs.) and pull out the cord connectors from the machine socket. To attach: 3.

  • Page 11: Mechanical Adjustment

    MECHANICAL ADJUSTMENT MOTOR BELT TENSION Correct Setting: To check for proper belt tension, press the belt in the middle of the span lightly with your finger (approximately 300 grams-force). The belt should bend 5 to 6 mm. To adjust: 1. Remove the rear cover (see page 2). 2.

  • Page 12: Needle Height

    MECHANICAL ADJUSTMENT 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 12.0 mm when the needle bar is at the highest position. To adjust: 1. Remove face plate, rear cover, top cover, looper cover and front cover (see pages 1 to 5). 2.

  • Page 13: Presser Bar Height

    MECHANICAL ADJUSTMENT PRESSER BAR HEIGHT 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 face plate, looper cover, top cover and front cover (see pages 1 to 5). 2.

  • Page 14: Feed Dog Height

    MECHANICAL ADJUSTMENT FEED DOG HEIGHT Correct Setting: When the presser foot is lowered and 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 15: Timing Of Needle And Feed Dog

    MECHANICAL ADJUSTMENT TIMING OF NEEDLE AND 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 the presser foot is lowered, the top of the feed dog teeth should be level with the top surface of needle plate at their rearmost position.

  • Page 16: Timing Of Needle And Upper Knife

    MECHANICAL ADJUSTMENT TIMING OF NEEDLE AND UPPER KNIFE Correct Setting: The upper knife timing is the same as that of the needle bar. When the needle bar is at highest position, the upper knife should be also at its highest position. To adjust: 1.

  • Page 17: Height Of Lower Looper

    MECHANICAL ADJUSTMENT HEIGHT OF LOWER LOOPER Correct Setting: The height of lower looper is 65.7 mm from the center of lower looper shaft as shown in Illustration. To adjust: 1. Remove the setscrew A and thread guide supporter (unit). 2. Set the upper knife in down position to loosen setscrew B. 3.

  • Page 18: Clearance Between Needles And Lower Looper/Needle Guards (1 Of 3)

    MECHANICAL ADJUSTMENT CLEARANCE BETWEEN NEEDLES AND LOWER LOOPER/NEEDLE GUARDS (1 of 3) Correct Setting: Both right and left needles should have an equal clearance from the front edge of the needle holes on the needle plate. The standard clearance between the Ieft and right needle and the lower looper is 0 mm to 0.1 mm (see page 16). The standard clearance between the needles and the rear needle guard is 0 mm to 0.2 mm (see page 17).

  • Page 19: Clearance Between Needles And Lower Looper/Needle Guards (2 Of 3)

    MECHANICAL ADJUSTMENT CLEARANCE BETWEEN NEEDLES AND LOWER LOOPER/NEEDLE GUARDS (2 of 3) 1. Remove the left needle only. 2. Turn the handwheel toward you to bring the tip of the lower looper from the left side to the rear side of the right needle.

  • Page 20: Clearance Between Needles And Lower Looper/Needle Guards (3 Of 3)

    MECHANICAL ADJUSTMENT CLEARANCE BETWEEN NEEDLES AND LOWER LOOPER/NEEDLE GUARDS (3 of 3) 1. Loosen the hexagonal bolts A (2 pcs.) and setscrews (2 pcs.). 2. Push the right needle by the front needle guard to adjust the cIearance between the needle and the lower looper.

  • Page 21: Clearance Between Needles And Fixed Needle Guard

    MECHANICAL ADJUSTMENT CLEARANCE BETWEEN NEEDLES AND FIXED NEEDLE GUARD Correct Setting: The clearance between needle and the fixed needle guard should be 0.1 to 0.4 mm. To adjust: 1. Remove the presser foot and the needle plate and lower the needle to its lowest position. 2.

  • Page 22: Position Of Chaining Finger

    MECHANICAL ADJUSTMENT POSITION OF CHAINING FINGER Correct Setting: When set the needle plate setting knob to the guide line S, the chaining finger should touch the side of needle plate, and the tip of chaining finger should be same level with the tip of the needle on the needle plate. To adjust: 1.

  • Page 23: Position Of Upper Looper

    MECHANICAL ADJUSTMENT POSITION OF 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 24: Timing Of Needle And Lower Looper

    MECHANICAL ADJUSTMENT TIMING OF NEEDLE AND LOWER LOOPER Correct setting: When the needle comes up 2.8 to 3.2 mm from its lowest position, the tip of the lower looper comes just left of the needle (#14) on the right. To adjust: 1.

  • Page 25: Timing Of Upper And Lower Loopers

    MECHANICAL ADJUSTMENT TIMING OF 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 Figure 1. To adjust: 1.

  • Page 26: Clearance Between Loopers

    MECHANICAL ADJUSTMENT CLEARANCE BETWEEN LOOPERS Correct setting: When the upper and lower loopers meet as shown in Figure 2, the clearance should be 0 to 0.1 mm as shown in Figure 1. To adjust: 1. Remove the presser foot and needle plate. 2.

  • Page 27: Clearance Between Needle And Upper Looper

    MECHANICAL ADJUSTMENT CLEARANCE BETWEEN NEEDLE AND 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 28: Position Of Knives

    MECHANICAL ADJUSTMENT POSITION OF 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 upper knife should be 0.8 to 1.5 mm below the edge of lower knife. To adjust: 1.

  • Page 29: Position Of Lower Looper Thread Guide

    MECHANICAL ADJUSTMENT POSITION OF LOWER LOOPER THREAD GUIDE Lower looper thread guide (3) Loosen the setscrew A, and adjust the lower looper thread guide (3) so that the hole of thread guide is in line with the groove of lower looper as shown in Drawing 1. Looper thread guide Loosen the setscrew B, 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 2.

  • Page 30: Stitch Length

    MECHANICAL ADJUSTMENT 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 the 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 31: Thread Tension Dials

    MECHANICAL ADJUSTMENT THREAD TENSION DIALS Correct setting: Use a standard thread #50. Do not pass the thread through the top cover thread guide. Standard tension: Left needle: Tension dial set to 3, 29 to 35 grams-force, Tension dial set to 9, 75 grams-force or more Right needle: Tension dial set to 3, 15 to 19 grams-force, Tension dial set to 9, 50 grams-force or more Upper looper: Tension dial set to 3, 9 to 13 grams-force, Tension dial set to 9, 30 grams-force or more Lower looper: Tension dial set to 3, 37 to 47 grams-force, Tension dial set to 9, 117 grams-force or more...

  • Page 32: Oiling

    OILING Apply a few drops of fine quality sewing machine oil to the parts indicated with arrows. It is recommended to apply oil once a week in normal use, once in ten working-hours in continuous use. Open the side cover and apply oil.

  • Page 33: Gauges For Servicing

    GAUGES FOR SERVICING Servicing gauge Lower looper height Gauge Needle gauge Thickness O.L G05 No.787-G-01 No.787-G02 No.787-G03 Adjusting gauge O.L G05 This gauge is used for adjusting the following characteristics: (A): Needle bar height (B): Presser bar height (C): Feed dog height & position of knives 11.6 mm (D): Upper looper lowest position 4.5 mm...

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