Singer 4423 Service Manual

Singer 4423 Service Manual

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4411-4423-4432-4443-4452
5511-5523-5532-5554
44S-85SCH
Service Manual
104 73 14-26
2014-02-24

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  Summary of Contents for Singer 4423

  • Page 1 4411-4423-4432-4443-4452 5511-5523-5532-5554 44S-85SCH Service Manual 104 73 14-26 2014-02-24...
  • Page 2: Table Of Contents

    CONTENTS 1. Names of principal parts ......................2 2. Removing methods of external parts 2-1 Sewing table ..........................3 2-2 Face plate ..........................3 2-3 Base cover ..........................3 2-4 Free arm base ........................3 2-5 Free arm slab .........................4 2-6 Arm top cover ........................4 2-7 Back cover ..........................5 2-8 Front cover..........................6 3. Adjusting methods of each part 3-1 Play of arm shaft ........................7 3-2 Noisy - take up lever adjustment ..................8 3-3 Needle drop position adjustment ..................8 3-4 Height of presser foot ......................9 3-5 Needle flow at maximum zigzag width ................10 3-6 Needle center position adjustment..................11 3-7 Needle position on zigzag ....................12 3-8 Automatic needle threader adjustment ................13 3-9 Adjustment of feed rock shaft and feed lifting rock cam ..........14 3-10 Height of needle bar ......................15 3-11 Timing of needle and hook ....................16 3-12 Distance-needle-hook ......................17 3-13 Play between shuttle driver shaft gear and lower shaft gear ........18 3-14 Play of shuttle driver shaft ....................19 3-15 Feed-dog height ........................20 3-16 Position of feed-dog in relation to the needle plate (left to right) ........21 3-17 Upper thread tension adjustment ...................22 3-18 Shuttle hook tension adjustment ..................23 3-19 Motor belt tension .
  • Page 3: Names Of Principal Parts

    1. Names of principal parts 1. Thread tension dial 16. Horizontal spool pin 2. Presser foot pressure adjustment 17. Bobbin winding spindle 3. Thread take-up lever 18. Hole for second spool pin 4. Reverse sewing lever 19. Handwheel 5. Thread cutter 20. Buttonhole stitch balance adjustment slot 6.
  • Page 4: Removing Methods Of External Parts

    2. Removing methods of external parts 2-1 Sewing table Keep the snap-in sewing table horizontal, and pull it in the direction of the arrow. (1) 2-2 Face plate - Remove the operation cover (a). - Loosen the screw (b) and remove the face plate. (2) 2-3 Base cover - Lay down machine. - Remove the screws (c, d, e, f, g, h).
  • Page 5: Free Arm Slab

    2-5 Free arm slab - Remove the screw (k). (5) - Remove the free arm slab. (6) Free arm slab 2-6 Arm top cover Remove the screws (l, m) and remove the arm top cover. (7) ...
  • Page 6: Back Cover

    2-7 Back cover - Remove the screws (n, o). (9) - Remove the screw (p). (10) - Remove the screw (q). (11) - Remove the back cover. (12) ...
  • Page 7: Front Cover

    2-8 Front cover - Remove the screw (r) which deeply inside the machine. (13) - Loosen the screw (s) about 3mm. (14) - Remove the pattern select dial (t, u) and remove front cover following direction of arrow. (15)
  • Page 8: Adjusting Methods Of Each Part

    3. Adjusting methods of each part 3-1 Play of arm shaft - Remove the face plate, arm top cover. - Loosen the screws (a, b) of arm shaft collar (d). (1) - Pull the hand wheel to the right. (2) - Push the arm shaft collar (d) to right tightly against arm shaft bushing (c), and then fasten and secure the screws (a, b).
  • Page 9: Noisy - Take Up Lever Adjustment

    3-2 Noisy - take up lever adjustment - Remove the face plate and front cover. - Turn around hand wheel, check noisy and movement. - Remove the screw (a), push take up lever support (b) right to proper location, tight the screw (a). (1) - If adjustment is too tight, it will be difficult to move during turn around hand wheel.
  • Page 10: Height Of Presser Foot

    3-4 Height of presser foot - Remove the face plate and lift up presser bar lifter lever (a). (1) - Loosen the screw (b) of presser bar bracket. - Place the gauge (c) (6.0~6.2mm) on top of needle plate. (3) - Pull down the presser bar lifter lever so bottom of presser foot and top surface of gauge would meet.
  • Page 11: Needle Flow At Maximum Zigzag Width

    3-5 Needle flow at maximum zigzag width - Remove the face plate, back cover and front cover. - Set the pattern selector dial to " ". Turn the stitch width dial to "6". - Set the needle bar at its lowest point when it 3-5mm swings to left.
  • Page 12: Needle Center Position Adjustment

    3-6 Needle center position adjustment - Remove the face plate. - Set the pattern selector dial to " " or " ". Turn the stitch width dial to "0". - Loosen the screw (a) of needle bar driving rod pin (b). (1) - Adjust the needle bar driving rod pin (b) position, clockwise needle will turn left, counter clockwise needle will turn right.
  • Page 13: Needle Position On Zigzag

    3-7 Needle position on zigzag - Remove the face plate, back cover and front cover. - Set the pattern selector dial to " ". Turn the stitch width dial to "6". Set the needle position dial to middle. - Adjust the needle by turning screw (a) of zigzag regulator crank complete clockwise / counter-clockwise.
  • Page 14: Automatic Needle Threader Adjustment

    3-8 Automatic needle threader adjustment - Remove the face plate and turn hand wheel to raise needle bar to its highest position. - Loosen the screw (a) of the threader stopper (b). (1) - Move the stopper (b) upward and the threader hook will become higher. Move the stopper (b) downward and the threader hook will become lower.
  • Page 15: Adjustment Of Feed Rock Shaft And Feed Lifting Rock Cam

    3-9 Adjustment of feed rock shaft and feed lifting rock cam - Remove the cord reel cover and free arm cover. - Turn the hand wheel to make the needle at its lowest point. - Check if the feed lifting rock cam (a) and the screw (b) of feed rock cam (c) are parallel. - If the screw of feed rock cam are not parallel: Loosen the screw (b) of feed rock cam (c)
  • Page 16: Height Of Needle Bar

    3-10 Height of needle bar - Remove the needle plate. - Set the pattern selector dial to " " or " ". Turn the stitch width dial to "0". - Remove the screws of rotary hook plate (a, b) and rotary hook plate, and take out the shuttle hook (c).
  • Page 17: Timing Of Needle And Hook

    3-11 Timing of needle and hook - Remove the face plate. - Set the pattern selector dial to " " . Turn the stitch width dial to "6". - Set the needle bar at its lowest point. Place a clamp (a) around the needle bar, slightly tighten its screw (c).
  • Page 18: Distance-Needle-Hook

    3-12 Distance-needle-hook - Remove the face plate, front cover, back cover and needle plate. - Set the pattern selector dial to " ". Turn the stitch width dial to "6". - Take off the shuttle hook. - Set the needle towards the lowest point of right side and lift it, make sure space between needle and the tip of the shuttle hook holder is 0.05~0.10mm.
  • Page 19: Play Between Shuttle Driver Shaft Gear And Lower Shaft Gear

    3-13 Play between shuttle driver shaft gear and lower shaft gear - Remove the free arm cover and needle plate. - Take off the shuttle hook. - Loosen three set screws (a, b, c) of the lower shaft gear (d) and move the lower shaft gear to right or left against axial direction.
  • Page 20: Play Of Shuttle Driver Shaft

    3-14 Play of shuttle driver shaft - Remove the needle plate. - There are 2 gauges (a, b) for testing the 0.5 mm 0.3 mm play of shuttle driver shaft. (1) - When you turn the hand wheel counter- clockwise, the shuttle hook (c) will move to 1.0 mm 0.6 mm rotary hook plate (d), and generate the play...
  • Page 21: Feed-Dog Height

    3-15 Feed-dog height When the feed dog is in it's highest position it should be 0.9 to 1.05 mm above the surface of the needle plate. - Set the stitch length dial to "4". .~.mm - Remove the presser foot and free arm cover.
  • Page 22: Position Of Feed-Dog In Relation To The Needle Plate (Left To Right)

    3-16 Position of feed-dog in relation to the needle plate (left to right) - Remove the cord reel cover and free arm cover. - Loosen the screw (e) of the feed crank shaft (d) that is on the right side. (1) - Loosen the screw (b) of the feed crank shaft (c) that is on the left side.
  • Page 23: Upper Thread Tension Adjustment

    3-17 Upper thread tension adjustment - Set the dial tension (a) to "4". (1) - Use a dial tension gauge (150g) (b) to take measurement. (1) - Put dial tension thread into gauge's hook and pull, the standard range should be 70~80g. - Remove the face plate, back cover, and front cover.
  • Page 24: Shuttle Hook Tension Adjustment

    3-18 Shuttle hook tension adjustment - Remove the needle plate. - Use a dial tension gauge (50g) (a) to take measurement. (1) - Put dial tension thread into shuttle hook (b)(the same way as inserting the bobbin) and pull it out, the standard range should be 10~14g.
  • Page 25: Motor Belt Tension

    3-19 Motor belt tension - Remove the back cover, front cover and test tension of motor belt using belt tension gauge (a). Its standard measurement should be 100g. (1) - Adjusting the belt adjusting plate (b) to regulate the improper belt's tension. The way to adjust is as following: Loosen the screws (c, d) of adjusting plate (b), and then move it to up, the belt will...
  • Page 26: Drop Point Of Needle

    3-20 Drop point of needle - Set pattern selector dial to " ". - Place a piece of blank paper on top of the needle plate and use presser foot to secure paper by pressing presser bar lifter lever down. - Adjust the speed limiting adjustment lever to the slow speed and step on the foot controller lightly.
  • Page 27: Forward And Reverse Stitching In Buttonhole Sewing (Feeding Pitch Of Reverse And Forward Stitching Is Not Even)

    3-21 Forward and reverse stitching in buttonhole sewing (feeding pitch of reverse and forward stitching is not even) - Sew the right side by setting the selector dial at " " and then the left side by setting at " " (only for 4411/5511). - Set the pattern selector dial to "...
  • Page 28: Buttonhole Upper And Lower Stitching Problem

    3-22 Buttonhole upper and lower stitching problem - Remove the back cover. - Set the pattern selector dial to " " (only for 4411/5511). - Set the pattern selector dial to " ". - Set the stitch length dial at "0.5" to "1". - While buttonhole upper or lower stitching, remain the same distance tacking without delivering cloth.
  • Page 29: Bobbin Winding Problem

    3-23 Bobbin winding problem - Place empty bobbin on spindle and push it to the right. - Put the thread into the spool rod, and put the spool rod cover on it. - Lead thread from spool to back side of thread guide (a) by following the indication. - Wind thread clockwise around bobbin winder tension disc.
  • Page 30 030Q5D0001(B)(EN)_SINGER 4411.4423.4432.4443.4452(Q250.Q50.Q60DST) 5511.5523.5532.5554(Q25.Q50.Q60DST) 44S(Q50DST) 85SCH(Q60DST)

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