Singer Sewing Machine Manual 3337

The Singer 3337 is a versatile, easy-to-use mechanical sewing machine designed for beginners and intermediate sewers. It features 23 built-in stitches, a one-step buttonhole, adjustable stitch length and width, built-in needle threader, top drop-in bobbin, free arm capability, and multiple presser feet. This manual covers safety, features, setup, operation, maintenance, and troubleshooting for your Singer 3337 sewing machine.

1. Features at a Glance 2. Unpacking and Setup 3. First-Time Operation 4. Specifications 5. Controls and Settings 6. Stitch Selection and Adjustment 7. Threading and Bobbin Winding 8. Presser Feet and Accessories 9. Maintenance and Cleaning 10. Warranty Information 11. Troubleshooting

Features at a Glance

Key components: Main body with free arm, stitch selection dial, built-in needle threader, top drop-in bobbin system, accessory storage, foot pedal, and power cord.

Feature	Description
Built-in Stitches	23 stitches including straight, zigzag, stretch, and decorative
One-Step Buttonhole	Automatically creates buttonholes of consistent size
Stitch Length/Width Control	Adjustable for different fabric types and sewing techniques
Built-in Needle Threader	Simplifies threading the needle
Top Drop-in Bobbin	Easy to insert and see thread supply
Free Arm	Removable flatbed for sewing cuffs and sleeves
Presser Feet	Includes all-purpose, zipper, buttonhole, and button sewing feet
Stitch Selection Dial	Turn to select desired stitch pattern
Reverse Stitch Lever	For reinforcing stitches at beginning and end of seams
Power/Speed Control	Foot pedal controls sewing speed

Unpacking and Setup

Carefully unpack all components and place machine on stable surface.

Remove machine from box: Lift by base, not by free arm or accessories.
Attach foot pedal: Connect to port on right side of machine.
Connect power: Plug power cord into machine, then into 120V AC outlet.
Install needle: Loosen needle clamp screw, insert needle with flat side to back, tighten screw.
Attach presser foot: Lift presser foot lever, snap on all-purpose foot.

WARNING! Keep fingers away from needle area during setup. Ensure machine is unplugged when installing needle.

First-Time Operation

Power on machine; follow these steps for initial use.

Wind bobbin: Place thread spool on pin, guide thread through bobbin winding tension, press foot pedal.
Thread upper thread: Follow numbered guides on machine, use built-in needle threader.
Insert bobbin: Drop bobbin into compartment with thread running counterclockwise.
Select stitch: Turn dial to straight stitch (position 1) for practice.
Test sew: Place fabric under presser foot, lower foot, gently press foot pedal.

CAUTION! Always start with needle in highest position. Keep hands clear of moving needle.

Specifications

Model: Singer 3337 Mechanical Sewing Machine.
Stitches: 23 built-in stitches (6 basic, 7 stretch, 10 decorative).
Buttonhole: One-step automatic buttonhole.
Stitch Length: Adjustable up to 4mm.
Stitch Width: Adjustable up to 5mm.
Bobbin: Class 15 transparent top drop-in bobbin.
Needle: Standard domestic sewing machine needles (size 11/80 recommended).
Presser Feet: 4 included (all-purpose, zipper, buttonhole, button sewing).
Power Source: 120V AC, 60Hz, 0.7 amps.
Weight: 13.2 lbs (6 kg).

Controls and Settings

Main controls located on front and right side of machine. Stitch Selection Dial: Turn to choose stitch pattern (1-23). Stitch Length Dial: Adjust from 0-4 (0 for buttonhole). Stitch Width Dial: Adjust from 0-5mm. Reverse Stitch Lever: Press and hold for backstitching. Presser Foot Lever: Raises and lowers presser foot. Handwheel: Manual control of needle position (turn toward you).

Thread Tension: Adjust dial (usually set at 4 for normal sewing). Built-in Needle Threader: Pull down, hook thread, pull up. Bobbin Winding: Disengages needle mechanism when winding bobbin.

Stitch Selection and Adjustment

Select appropriate stitch for your project using dial.

Straight Stitch (1): For seams, topstitching, basting. Adjust length for fabric weight.
Zigzag Stitch (2-3): For finishing edges, appliqué, stretch fabrics. Adjust width as needed.
Stretch Stitches (4-10): For knit fabrics, elastic. Use appropriate stitch for fabric type.
Decorative Stitches (11-23): For embellishment. Practice on scrap fabric first.
Buttonhole (marked position): Place fabric under foot, lower lever, machine creates complete buttonhole.

Tip: Always test stitch on scrap fabric of same type before sewing project.

Threading and Bobbin Winding

Proper threading is essential for good stitch quality.

Upper Threading: Follow numbered path from spool pin to needle. Use built-in threader for needle.
Bobbin Winding: Place spool on pin, thread through guides, place empty bobbin on winder, engage bobbin winding mechanism, press foot pedal.
Bobbin Insertion: Open cover, drop bobbin in with thread running counterclockwise, pull thread through slot.
Bring Up Bobbin Thread: Hold upper thread, turn handwheel toward you until needle goes down and up, pull upper thread to bring bobbin thread up.

WARNING! Ensure presser foot is raised when threading upper thread. Always use same thread type in bobbin and needle.

Presser Feet and Accessories

Includes 4 presser feet for different functions.

Foot	Use	Installation
All-Purpose	General sewing, straight and zigzag stitches	Snap onto presser foot holder
Zipper Foot	Installing zippers, piping, cording	Snap on, can be adjusted left or right
Buttonhole Foot	Creating buttonholes (used with buttonhole stitch)	Snap on, includes markings for button size
Button Sewing Foot	Attaching buttons	Snap on, holds button in place while sewing

Additional accessories: Seam ripper, lint brush, needles, bobbins, spool pin felt, screwdriver.

Maintenance and Cleaning

Regular maintenance ensures optimal performance.

Daily: Brush lint from bobbin area and feed dogs after each project.
Weekly: Remove needle plate to clean underneath (unplug machine first).
Monthly: Oil machine as per manual instructions (use only sewing machine oil).
Needle Replacement: Change needle after every 8 hours of sewing or with new project.
Storage: Cover machine when not in use to prevent dust accumulation.

CAUTION! Always unplug machine before cleaning or maintenance. Never use compressed air to clean machine.

Warranty Information

Singer 3337 comes with a 25-year limited warranty. Warranty covers defects in materials and workmanship under normal household use. Does not cover damage from misuse, improper maintenance, commercial use, or unauthorized repairs. For warranty service, contact Singer Customer Service at 1-800-4-SINGER or visit www.singer.com. Keep original receipt as proof of purchase.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Machine won't run	Not plugged in, foot pedal disconnected	Check power connections; ensure foot pedal is firmly connected
Thread bunching underneath	Incorrect threading, bobbin inserted wrong	Re-thread upper and bobbin threads; ensure bobbin turns counterclockwise
Needle breaks	Wrong needle size, bent needle, pulling fabric	Replace needle; don't pull fabric; use correct needle for fabric
Uneven stitches	Incorrect tension, dirty machine	Clean machine; adjust tension; re-thread
Fabric not feeding	Presser foot down, feed dogs lowered	Raise and lower presser foot; check feed dog position
Thread breaks	Old thread, incorrect tension, burred needle	Use new thread; adjust tension; replace needle
Buttonhole not forming	Incorrect stitch selection, fabric too thick	Select buttonhole stitch; use stabilizer for thin fabrics

Reset: Unplug machine for 5 minutes to reset electronic components.

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