The Singer Sewing Machine Model 4423 is a heavy-duty mechanical sewing machine designed for a wide range of fabrics. It features a powerful motor, 23 built-in stitches, a one-step buttonhole, adjustable presser foot pressure, and a top drop-in bobbin system. This parts manual provides detailed identification, diagrams, ordering information, and maintenance guidance for all components of the Model 4423. Below are key sections covering parts identification, diagrams, maintenance, ordering, and safety.
Key components are illustrated in the exploded view diagrams. Reference numbers correspond to the parts list for identification and ordering.
| Ref. No. | Part Name | Description |
|---|---|---|
| 1 | Handwheel | Main handwheel for manual operation and bobbin winding |
| 2 | Stitch Selector Dial | Dial for selecting from 23 built-in stitches |
| 3 | Presser Foot Lever | Lever to raise and lower the presser foot |
| 4 | Tension Dial | Adjusts upper thread tension (0-9) |
| 5 | Take-Up Lever | Moves thread up and down during stitching |
| 6 | Needle Clamp Screw | Holds the needle in place |
| 7 | Bobbin Winder Spindle | Spindle for winding the bobbin |
| 8 | Slide Plate | Cover for bobbin compartment |
| 9 | Feed Dogs | Moves fabric under the presser foot |
| 10 | Presser Foot | Standard zigzag presser foot (included) |
Components related to needle insertion, presser feet, and thread guidance.
WARNING! Always turn power off and unplug machine before changing needle or presser foot to avoid injury.
Parts for the bobbin system, located under the slide plate.
CAUTION! Use only Class 15 transparent plastic bobbins (Singer style). Metal bobbins may damage the hook.
Controls for selecting stitch patterns and settings.
Stitch Selector Dial: Rotate to choose from 6 basic, 7 stretch, 9 decorative stitches, and 1 buttonhole. Stitch Length Dial: Adjusts from 0-4 mm. Stitch Width Dial: Adjusts zigzag width from 0-5 mm. Reverse Stitch Lever: Hold down for reverse stitching. Power/ Light Switch: Turns machine and light on/off.
Non-mechanical parts including covers, screws, and accessories.
Tip: Keep covers clean and free of dust to prevent debris from entering machine.
Regular maintenance ensures optimal performance and longevity.
WARNING! Unplug machine before any maintenance. Use only recommended oil. Over-oiling can stain fabric.
Quick reference for common problems and parts that may be involved.
| Symptom | Possible Cause | Related Part / Action |
|---|---|---|
| Thread bunching underneath | Incorrect threading, bent needle, dirty hook | Check needle (Part #1), clean hook assembly (Part #2) |
| Machine jams or won't run | Thread jam in hook, worn drive belt | Clear jam, inspect belt (Part #X504912) |
| Uneven stitches | Incorrect tension, damaged tension discs | Adjust tension dial, check tension assembly |
| No power/light | Faulty power cord, blown bulb, bad switch | Test cord, replace bulb (Part #X504088), check switch |
| Buttonhole not forming | Misaligned buttonhole foot, incorrect stitch setting | Realign Buttonhole Foot (Part #X504205), check dial |
To order genuine Singer parts, contact an authorized dealer or Singer directly.
Primary Parts Source: Singer Authorized Service Centers. Online: www.singer.com/support. Phone: 1-800-4-SINGER. Required Information: Model Number (4423), Part Reference Number, Part Description. Note: Use only genuine Singer parts to maintain performance and warranty.
This machine is designed for household use. Warranty covers defects in materials/workmanship for 25 years on the head, 2 years on electronics, 1 year on labor. Warranty is void if machine is serviced by non-authorized personnel or if non-genuine parts are used.
Safety: Keep fingers away from moving needle. Unplug for cleaning/maintenance. Do not operate with damaged cord. Use in dry environment.
Service: For repairs, locate an authorized service center at www.singer.com.