Singer 4423 Service Manual
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- User manual ,
- Instruction manual & cooking manual (67 pages) ,
- Instruction manual (65 pages)
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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...
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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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Questions and answers
Bobbin not winding at all,
The bobbin on the Singer 4423 may not be winding due to several possible reasons:
1. Bobbin Winder Adjustment – If the bobbin is not filling properly, the screw on the bobbin winder bracket shaft may need adjustment. Turning it clockwise or counterclockwise helps control how much thread fills the bobbin.
2. Engagement Issue – Ensure the bobbin winder is pushed fully to the right before pressing the pedal. If it is not engaged properly, the bobbin will not spin.
3. Threading Problem – If the thread is not correctly placed in the bobbin winding guides, it may not wind onto the bobbin.
4. Machine Belt or Motor Issue – If the machine’s motor or belt is not functioning correctly, the bobbin winder may not spin.
5. Presser Foot Pedal Issue – If the pedal is not properly connected or functioning, the machine may not respond when pressed.
Checking these factors should help identify and resolve the problem.
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Top thread gets caught on bobbin case retainer clip
To fix the top thread getting caught on the bobbin case retainer clip on a Singer 4423, follow these steps:
1. Rethread the Machine – Ensure the upper thread is correctly threaded, passing through all guides and tension discs properly.
2. Check the Bobbin Case – Remove and reinsert the bobbin case, ensuring it is seated correctly.
3. Verify Bobbin Threading – Make sure the bobbin is threaded correctly and that the thread pulls smoothly.
4. Inspect the Needle – Ensure the needle is correctly inserted with the flat side facing the back. Replace it if it is damaged.
5. Adjust Thread Tension – If the thread tension is too tight, reduce it to a lower number.
6. Turn the Handwheel Manually – Slowly turn the handwheel towards you to see if the thread is catching. If it does, recheck threading and bobbin placement.
If the issue persists, cleaning the bobbin area and removing any lint or debris may help.
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My machine produces a screeching sound whilst I'm sewing...the sound comes and goes . It appears as if something is getting stuck somewhere then it releases again.
The Singer 4423 sewing machine may make a screeching sound due to several possible issues:
1. Debris and Material Buildup – Fabric or debris caught inside the machine can cause noise. Cleaning the machine can help.
2. Incorrect Threading – If the top thread is not properly threaded through the tension disks or the lower bobbin is not set correctly, it can cause timing issues and noise.
3. Needle Issues – A damaged or incorrectly installed needle can cause clicking or screeching sounds. Replacing the needle may solve the problem.
4. Bobbin Case Problems – Scratches or damage to the bobbin case can cause friction and noise. Replacing a damaged bobbin case may be necessary.
Checking and addressing these issues can help eliminate the screeching sound.
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Does the Singer 4432 ever need oiling? If so where may I find instructions for oiling? And any other home maintenance?
The Singer 4423 sewing machine is factory-lubricated and does not require regular oiling unless it is used frequently. You can add a small amount of oil to the needle shaft and bobbin area without causing damage. If you sew daily, lubricate weekly. If you sew a few days a week, lubricate monthly. For full maintenance, take the machine to a qualified service center once a year. Instructions beyond this are not provided in the context.
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How to oil 4423
To oil a Singer 4423 sewing machine:
1. Turn Off the Machine: Always power off the machine before starting.
2. Raise the Needle and Presser Foot: Turn the handwheel counterclockwise to raise the needle to its highest point and lift the presser foot.
3. Access Internal Parts: Open the machine’s covers to reach internal moving parts.
4. Apply Sewing Machine Oil: Lightly oil all moving parts inside the machine. Avoid over-oiling.
5. Felt Pads: Some models have felt pads underneath that should be saturated with oil.
6. Bobbin Area: Be careful when oiling near the bobbin area. Some parts may require grease instead of oil.
7. Run the Machine: After oiling, run the machine briefly to distribute the oil.
Use only sewing machine oil, not household oil. Clean lint and dust before oiling.
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