Manual for Singer Sewing Machine 3337

The Singer Sewing Machine 3337 is a versatile mechanical sewing machine designed for home use, featuring 23 built-in stitches, a one-step buttonhole, adjustable stitch length and width, built-in needle threader, drop-in bobbin system, free arm capability, and multiple presser feet. It operates on 110-120V AC and is suitable for a wide range of fabrics. Below are key sections for safety, features, setup, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Mechanical sewing machine body, foot pedal, power cord, accessory box with presser feet, bobbins, needles, and seam ripper.

Unpacking and Setup

Unpack and inspect all contents. Place on a stable, flat surface.

1. Remove machine from box: Lift by the carrying handle, not by the free arm.
2. Attach foot pedal: Connect pedal to machine port, then plug power cord into outlet.
3. Install needle: Loosen needle clamp screw, insert needle with flat side to the back, tighten.
4. Wind bobbin: Follow bobbin winding instructions in section 8.
5. Thread machine: Refer to threading diagram on machine or section 8.

WARNING! Keep fingers away from needle area during setup and operation. Ensure machine is unplugged when not in use.

First-Time Operation

Plug in power cord, turn on light switch, and test basic functions.

1. Select straight stitch: Set stitch selector to "0".
2. Adjust stitch length: Set to medium (2.5) for general sewing.
3. Thread machine and insert bobbin: Follow threading guide.
4. Place fabric under presser foot: Lower presser foot lever.
5. Start sewing: Gently press foot pedal to begin.
6. Practice on scrap fabric: Test stitches and tension.

CAUTION! Always turn handwheel toward you (counterclockwise) to avoid timing issues.

Specifications

• Model: Singer 3337 Mechanical Sewing Machine.
• Stitches: 23 built-in stitches.
• Buttonhole: One-step automatic.
• Max Stitch Length: 4mm.
• Max Stitch Width: 5mm.
• Bobbin: Class 15 transparent, top-drop-in.
• Needle: Standard domestic 15x1 (HAx1).
• Power Supply: 110-120V AC, 60Hz.
• Dimensions: 15.2" x 6.3" x 12" (approx).
• Weight: 13.2 lbs.

Controls and Settings

Main controls located on front and side of machine.

Stitch Selector Dial: Turn to choose stitch pattern (numbered 0-22). Stitch Length Dial: Adjust from 0 (no feed) to 4 (longest). Stitch Width Dial: Adjust zigzag and decorative stitch width (0-5). Reverse Stitch Lever: Hold down for backstitching. Handwheel: Manual control of needle position. Presser Foot Lever: Raises and lowers presser foot. Bobbin Winder: Located on top right for winding bobbin. Light Switch: Turns built-in LED light on/off.

Stitch Selection and Adjustment

Select stitches based on fabric and project type.

1. Straight Stitch (0): For seams, topstitching; adjust length for fabric weight.
2. Zigzag Stitch (1-3): For finishing edges, stretch fabrics; adjust width as needed.
3. Decorative Stitches (4-22): For embellishments; use medium-weight fabrics.
4. Buttonhole (B): Use buttonhole foot; follow markings for size.
5. Stretch Stitches (e.g., 14, 15): For knits and elastic fabrics.

Tip: Test stitch settings on a fabric scrap before starting your project.

Threading and Bobbin Winding

Correct threading is essential for proper stitch formation.

1. Bobbin Winding: Place spool on pin, thread through guide, wrap around bobbin, push bobbin winder to right, press foot pedal.
2. Upper Threading: Follow numbered path on machine: spool pin, thread guide, tension discs, take-up lever, needle threader.
3. Needle Threader: Lower lever, hook thread, pull back to thread needle.
4. Insert Bobbin: Drop bobbin into case with thread clockwise, pull thread under tension spring.
5. Bring Up Bobbin Thread: Hold upper thread, turn handwheel to lower and raise needle, pull up bobbin thread.

WARNING! Ensure presser foot is raised when threading upper thread to engage tension discs.

Maintenance and Cleaning

Regular maintenance ensures optimal performance.

1. Unplug machine before cleaning.
2. Remove needle plate screws; clean lint from feed dogs and bobbin area with brush.
3. Oil moving parts per manual instructions (use sewing machine oil only).
4. Wipe exterior with soft, dry cloth.
5. Replace needle after 8-10 hours of sewing or if damaged.

CAUTION! Do not use compressed air; it can force lint into mechanisms.

Accessories Included

Safety Information

Always follow safety guidelines to prevent injury or damage.

• Unplug machine when not in use, during threading, needle changes, or cleaning.
• Keep fingers away from moving needle and feed dogs.
• Do not sew over pins; remove them as you sew.
• Use correct needle and thread for fabric type.
• Ensure adequate lighting and a stable work surface.
• Keep machine out of reach of children and pets.

DANGER! Never operate with damaged power cord or foot pedal.

Troubleshooting

Reset: Unplug machine for 5 minutes to reset electronic components (if applicable).

Service: For technical support, contact Singer at 1-800-4-SINGER or visit www.singer.com.