Singer Model 3337 User Manual

The Singer Model 3337 is a versatile sewing machine designed for home use, featuring multiple stitch patterns, adjustable stitch length and width, built-in buttonholer, free arm capability, automatic needle threading, drop-in bobbin system, and adjustable presser foot pressure. Powered by standard household current. Below are key sections for safety, features, setup, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Unpacking and Setup 3. First-Time Operation 4. Specifications 5. Controls and Settings 6. Connecting Accessories 7. Stitch Selection and Use 8. Maintenance Features 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Sewing head with free arm, Foot controller, Power cord, Accessory box with presser feet, Bobbins, Needles, Seam ripper, Screwdriver, Spool caps.

Feature	Description
Stitch selector dial	For selecting built-in stitch patterns
Stitch length dial	Adjusts stitch length from 0 to 4 mm
Stitch width dial	Adjusts stitch width for zigzag and decorative stitches
Reverse stitch lever	For reinforcing stitches at beginning and end of seams
Bobbin winder	For winding thread onto bobbin
Drop-in bobbin system	Easy-load bobbin with clear cover
Automatic needle threader	Assists in threading the needle
Built-in buttonholer	One-step automatic buttonhole
Free arm	Removable extension table for sewing cylindrical items
Presser foot pressure dial	Adjusts pressure for different fabric types

Unpacking and Setup

Unpack and inspect contents. Place on stable surface at comfortable working height.

Remove machine from packaging: Lift machine by carrying handle, not by free arm.
Attach extension table: Slide onto free arm until it clicks into place.
Connect foot controller: Plug into machine port, then plug power cord into wall outlet.
Install needle: Loosen needle clamp screw, insert needle with flat side to back, tighten screw.

WARNING! Machine is heavy; lift with care to avoid injury. Ensure all connections are secure before plugging in.

First-Time Operation

Plug in power cord; follow setup steps.

Wind bobbin: Place spool on spindle, thread through guides, wind bobbin evenly.
Insert bobbin: Drop bobbin into case with thread running counterclockwise.
Thread upper thread: Follow numbered guides from spool to needle.
Use automatic needle threader: Lower lever, hook thread, raise lever to pull thread through eye.
Test stitches: Select straight stitch, place fabric under presser foot, depress foot controller.

CAUTION! Keep fingers away from needle area during operation. Always turn off when threading or changing accessories.

Specifications

Model: Singer 3337.
Stitch Patterns: 23 built-in stitches including straight, zigzag, stretch, and decorative.
Stitch Length: Adjustable 0-4 mm.
Stitch Width: Adjustable 0-5 mm.
Buttonholes: One-step automatic.
Needle System: 130/705 H household needles.
Bobbin: Class 15 transparent bobbin.
Power Source: 120V AC, 60Hz.
Speed Control: Foot controller with variable speed.
Warranty: 25-year limited warranty.

Controls and Settings

Main controls located on front and side of machine.

Front Panel: Stitch selector dial, Stitch length dial, Stitch width dial, Reverse stitch lever, Bobbin winder stop, Presser foot lifter.

Side Panel: Power switch, Light switch, Presser foot pressure dial.

Stitch Selection: Turn dial to desired stitch number (1-23). Stitch Adjustment: Use length/width dials for customization. Tension: Upper tension dial (3-4 for normal fabrics). Presser Feet: Snap-on system for quick changes (zigzag foot, buttonhole foot, zipper foot included).

Connecting Accessories

Presser feet: Lift presser foot lever, align foot with bar, lower lever to lock. Needles: Insert with flat side to back. Bobbins: Use only Class 15 bobbins.

Turn off power before changing accessories.
Match accessory to function (e.g., buttonhole foot for buttonholes).
Ensure proper alignment before lowering presser foot.

Tip: Always use genuine Singer accessories for optimal performance.

Stitch Selection and Use

Supports straight, zigzag, stretch, and decorative stitches.

Select stitch: Turn dial to desired pattern number.
Adjust settings: Set length and width as needed for fabric.
Position fabric: Lower presser foot at beginning of seam.
Start sewing: Press foot controller gently to begin, increase for desired speed.
Reverse: Hold reverse lever to backstitch at beginning and end.
Pivot: Needle down position for turning corners.
Buttonholes: Attach buttonhole foot, select buttonhole stitch, automatic cycle completes buttonhole.
Free arm: Remove extension table for sewing sleeves and cuffs.

WARNING! Never pull fabric while sewing; let feed dogs move fabric. Keep hands clear of moving needle.

Maintenance Features

Automatic bobbin winding: Stops when bobbin is full. Drop-in bobbin: Easy viewing of remaining thread. Needle threader: Simplifies threading for users with vision challenges.

Care & Cleaning

Unplug before cleaning. Remove lint from bobbin area and feed dogs regularly. Oil as instructed in manual.

CAUTION! Use only sewing machine oil. Do not use household oils. Keep machine covered when not in use.

Regulatory Information

Troubleshooting

Symptom	Possible Cause	Corrective Action
Machine doesn't run	Power connection	Check power cord connections; ensure foot controller is plugged in.
Thread bunching underneath	Threading/tension	Rethread top and bobbin; check bobbin insertion; adjust tension.
Needle breaks	Needle/bent needle	Replace needle; ensure correct insertion; don't pull fabric.
Uneven stitches	Tension/thread quality	Adjust tension dial; use good quality thread on both top and bobbin.
Buttonhole not forming	Foot attachment/stitch selection	Ensure buttonhole foot is attached; select buttonhole stitch.

Reset: Turn off, unplug for 30 seconds, then restart.

Service: 1-800-4-SINGER; www.singer.com for authorized service centers.