Singer Sewing Machine Manual for Model 3337

The Singer Model 3337 is a versatile, high-performance mechanical sewing machine designed for home use. It features a robust metal frame, multiple built-in stitches, adjustable stitch length and width, a four-step buttonhole, a drop-in bobbin system, and a free arm for sewing cylindrical items. It operates on standard household power (120V AC, 60Hz) and includes essential accessories. Below are key sections for safety, features, setup, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Metal frame body, Stitch Selector Dial, Stitch Length/Width Adjusters, Reverse Stitch Lever, Bobbin Winder, Handwheel, Presser Foot Lever, Free Arm.

Unpacking and Setup

Carefully unpack all contents. Place machine on a stable, well-lit table.

1. Remove all packaging materials and protective covers from the machine.
2. Install the foot controller: Plug the connector into the designated port on the right side of the machine.
3. Connect to power: Plug the power cord into the machine and then into a standard 120V AC wall outlet.
4. Attach the accessory tray: Slide it onto the free arm until it clicks into place.
5. Install the needle and presser foot as described in the First-Time Operation section.

WARNING! The machine is heavy. Use caution when lifting. Ensure the power switch is OFF before plugging in.

First-Time Operation

Power on the machine; the work light should illuminate.

1. Wind the bobbin: Place thread on the spool pin, guide it through the bobbin winder tension, place empty bobbin on winder shaft, push shaft to the right, and press the foot controller.
2. Insert the bobbin: Open the bobbin cover, drop in the bobbin with thread unwinding counter-clockwise, pull thread through the slot and under the tension spring.
3. Thread the upper thread: Raise the presser foot and needle to highest position. Follow the numbered threading path on the machine, ending by using the built-in needle threader.
4. Select a stitch: Turn the Stitch Selector Dial to the desired pattern (e.g., Straight Stitch).
5. Test sew: Place fabric under the presser foot, lower the foot, and gently press the foot controller to begin sewing.

CAUTION! Keep fingers away from the needle while sewing. Always turn the handwheel towards you (counter-clockwise).

Specifications

• Model: Singer 3337
• Type: Mechanical Sewing Machine
• Stitches: 23 Built-in Stitches
• Buttonhole: 4-Step Manual
• Max Stitch Length: 4mm
• Max Stitch Width: 5mm
• Bobbin: Class 15 Transparent (Drop-in style)
• Needle System: HAx1 / 130/705H
• Power Supply: 120V AC, 60Hz
• Included Accessories: All-Purpose Foot, Zipper Foot, Buttonhole Foot, Button Sewing Foot, Seam Ripper/Lint Brush, Needles, Bobbins (3), Spool Pin Felt, Screwdriver

Controls and Functions

Main Controls: Stitch Selector Dial, Stitch Length Dial (0-4), Stitch Width Dial (0-5), Reverse Stitch Lever, Handwheel, Presser Foot Lever, Bobbin Winder Stopper.

Stitch Guide: Located on the front panel, shows the symbol and recommended presser foot for each stitch.

Adjustments: Stitch Length (for longer/shorter stitches), Stitch Width (for wider/narrower zigzag), Presser Foot Pressure (for light/heavy fabrics), Tension Dial (normally set to 4 for balanced stitches).

Basic Stitching Guide

For straight stitch, zigzag, blind hem, and stretch stitches.

1. Select the correct presser foot for your stitch (e.g., All-Purpose Foot for straight stitch).
2. Set the Stitch Selector Dial to the desired pattern number.
3. Adjust the Stitch Length and Width dials as needed (Width is 0 for straight stitch).
4. Place fabric under the presser foot, lower the needle into the fabric manually using the handwheel, then lower the presser foot.
5. Gently press the foot controller to start sewing. Guide the fabric gently; do not push or pull.
6. Press and hold the Reverse Lever to backstitch at the beginning and end of a seam for reinforcement.

Tip: Always test stitch settings on a scrap piece of your project fabric first.

Advanced Functions

1. Four-Step Buttonhole: Attach the Buttonhole Foot. Set dial to Step 1 (right side), sew. Step 2 (front bar tack). Step 3 (left side). Step 4 (front bar tack).
2. Zipper Insertion: Use the Zipper Foot. Baste zipper area. Attach foot, aligning needle to left or right of foot as needed. Stitch slowly along the zipper tape.
3. Blind Hem: Use the Blind Hem Foot. Fold fabric as per instructions. Select the Blind Hem stitch (#9). The stitch will catch a small bit of the folded edge.
4. Decorative Stitches: Select any decorative stitch pattern. Use a stabilizer underneath lightweight fabrics for best results.

WARNING! Go slowly on thick layers. Use the handwheel to manually navigate difficult sections.

Maintenance & Cleaning

Unplug the machine before any maintenance.

1. Daily: Brush out lint from the bobbin area and feed dogs with the lint brush.
2. Needle: Replace the needle after every project or 8 hours of sewing. Insert with the flat side to the back.
3. Oiling: Apply 1-2 drops of Singer sewing machine oil to the designated points inside the bobbin area and under the top cover (as shown in diagram) every few months or after extensive use. Wipe away excess oil.
4. Exterior: Wipe with a soft, dry cloth.

CAUTION! Do not use compressed air to clean lint, as it can force debris deeper into the machine. Never spray cleaners or oil directly onto the machine.

Warranty Information

Singer Limited Warranty: This Singer model 3337 is covered by a 25-year limited warranty on the machine head and a 5-year limited warranty on electrical components. Proof of purchase is required. This warranty covers defects in materials or workmanship under normal household use. It does not cover damage from misuse, neglect, commercial use, or unauthorized repairs. For warranty service, contact Singer Customer Service at 1-800-4-SINGER or visit www.singer.com.

Troubleshooting

Reset: Unplug machine for 2 minutes to reset internal electronics if lights/functions behave erratically.

Service: For persistent issues, contact Singer Customer Service: 1-800-4-SINGER, www.singer.com.