The Singer Simple 3337 is a mechanical sewing machine designed for beginners and everyday sewing projects. It features 23 built-in stitches, a 4-step buttonhole, adjustable stitch length and width, built-in needle threader, drop-in bobbin system, free arm capability, and multiple presser feet. Powered by a foot pedal with speed control. Below are key sections for safety, features, setup, operation, maintenance, and troubleshooting.
Key components: Mechanical sewing head, Stitch selection dial, Stitch length dial, Stitch width dial, Reverse stitch lever, Built-in needle threader, Drop-in bobbin system, Free arm, Accessory storage.
| Feature | Description |
|---|---|
| Built-in Stitches | 23 stitches including straight, zigzag, decorative, and stretch stitches |
| 4-Step Buttonhole | Easy-to-create buttonholes in four simple steps |
| Stitch Length Dial | Adjusts stitch length from 0 to 4 mm |
| Stitch Width Dial | Adjusts stitch width from 0 to 5 mm for zigzag and decorative stitches |
| Reverse Stitch Lever | Secures stitches at beginning and end of seams |
| Built-in Needle Threader | Simplifies threading the needle |
| Drop-in Bobbin System | Top-loading, clear-view bobbin for easy monitoring |
| Free Arm | Removable accessory tray for sewing cuffs and sleeves |
| Presser Feet | Includes all-purpose, zipper, buttonhole, and button sewing feet |
| Power and Speed Control | Foot pedal with variable speed control |
Unpack and inspect all contents. Place on a sturdy, flat surface.
WARNING! Keep fingers away from needle area during setup and operation. Ensure machine is unplugged during needle installation.
Power on machine; practice on scrap fabric first.
CAUTION! Always turn handwheel toward you (counterclockwise) to avoid timing issues. Never force the handwheel.
Main controls located on front and right side of machine.
Stitch Selection Dial: Turn to select from 23 built-in stitches. Symbols correspond to stitch type.
Stitch Length Dial: Controls distance between stitches (0-4 mm). Higher numbers = longer stitches.
Stitch Width Dial: Controls side-to-side movement of needle (0-5 mm). For zigzag and decorative stitches.
Reverse Stitch Lever: Press and hold to sew in reverse for reinforcement.
Handwheel: Manual control of needle position. Always turn toward you.
Presser Foot Lever: Raises and lowers presser foot.
Thread Tension Dial: Adjusts upper thread tension (usually set between 4-5 for balanced stitches).
Refer to stitch chart on machine for visual guide to all 23 stitches.
| Stitch Number/Symbol | Stitch Type | Recommended Use | Suggested Settings |
|---|---|---|---|
| 1 | Straight Stitch | Basic seams, topstitching | Length: 2.5, Width: 0 |
| 2-3 | Zigzag Stitch | Finishing edges, appliqué | Length: 2, Width: 3-4 |
| 4-6 | Decorative Stitches | Embellishment, decorative seams | Length: 2.5, Width: 4 |
| 7-10 | Stretch Stitches | Knits, elastic fabrics | Length: 2.5, Width: 2.5 |
| Buttonhole Symbol | 4-Step Buttonhole | Creating buttonholes | Follow 4-step sequence |
Tip: Always test stitch settings on scrap fabric of same type before sewing your project.
Follow these steps for common sewing tasks.
WARNING! Always raise needle to highest position before changing presser feet or removing fabric.
Regular maintenance ensures optimal performance.
Cleaning: Unplug machine before cleaning. Use soft, dry cloth. Never use compressed air or liquids.
CAUTION! Use only sewing machine oil. Other oils can damage internal components.
UL Listed: Complies with UL Standard 1278. FCC Part 15: Class B digital device; complies with interference limits for residential use. Copyright © Singer Manufacturing Company. Trademarks owned by SVP Worldwide. For support, visit www.singer.com or contact 1-800-4-SINGER.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| Machine won't run | Not plugged in / Power switch off | Check power connection; ensure foot pedal is connected properly. |
| Thread bunching underneath | Incorrect threading / Bobbin issues | Re-thread top and bobbin; ensure bobbin inserted correctly. |
| Needle breaks | Wrong needle type / Bent needle | Replace with correct needle (15x1); ensure needle is straight and fully inserted. |
| Uneven stitches | Incorrect tension / Thread quality | Adjust tension dial; use quality thread; re-thread completely. |
| Fabric not feeding | Presser foot pressure / Feed dogs | Ensure presser foot is lowered; clean feed dogs; check stitch length setting. |
| Machine is noisy | Lack of oil / Lint buildup | Oil machine following lubrication points; clean lint from bobbin area. |
| Thread keeps breaking | Tension too tight / Old thread | Reduce tension; use fresh, quality thread; check for burrs on needle plate. |
Reset: Unplug machine for 5 minutes to reset electronic components if applicable.
Service: 1-800-4-SINGER; www.singer.com for authorized service centers.