Introduction
Welcome to the user manual for your new Singer 3337 Simple Sew Machine. This machine is designed for ease of use, making it ideal for sewing beginners and experienced users alike. This manual provides essential information to help you set up, operate, maintain, and troubleshoot your sewing machine, ensuring a smooth and enjoyable sewing experience.
For additional guidance and learning resources, you can access the FREE Online SINGER Owner's Class and the SINGER Sewing Assistant App, available for both iOS and Android devices. These resources are provided by Singer to enhance your sewing journey.
Product Overview
The Singer 3337 Simple Sew Machine is a versatile and user-friendly sewing machine. It features a robust design and intuitive controls, making it suitable for a variety of sewing projects.

Figure 1: Front view of the Singer 3337 Simple Sew Machine, showcasing its compact design and main controls.

Figure 2: Angled view of the Singer 3337, highlighting the stitch selection dial and other operational components.
Setup
1. Unpacking and Placement
Carefully remove the machine from its packaging. Place the machine on a stable, flat surface with adequate lighting. Ensure there is enough space around the machine for comfortable operation.
2. Power Connection
Connect the power cord to the machine and then plug it into a standard electrical outlet. Ensure the foot pedal is also connected to the machine.
3. Needle Installation
If the needle is not pre-installed or needs replacement, ensure the flat side of the needle faces the back of the machine. Insert the needle fully into the needle clamp and tighten the screw securely.
4. Bobbin Winding
- Place a spool of thread on the spool pin.
- Guide the thread through the upper thread guide and around the bobbin winding tension disc.
- Place an empty bobbin onto the bobbin winder spindle.
- Wind the thread a few times manually around the bobbin.
- Push the bobbin winder spindle to the right.
- Press the foot pedal to start winding. The machine will stop automatically when the bobbin is full.
- Cut the thread and remove the bobbin.
5. Inserting the Bobbin

Figure 3: Close-up view of the bobbin area, showing the clear cover and drop-in bobbin system.
- Open the bobbin cover plate.
- Insert the wound bobbin into the bobbin case, ensuring the thread unwinds counter-clockwise.
- Guide the thread through the tension spring and into the thread guide slot.
- Replace the bobbin cover plate.
6. Threading the Machine
- Raise the presser foot and needle to their highest positions.
- Place a spool of thread on the spool pin.
- Guide the thread through the upper thread guide.
- Follow the numbered threading path down to the needle.
- Thread the needle from front to back.
- Pull the bobbin thread up through the needle plate by turning the handwheel towards you to lower and raise the needle once.
- Pull both threads under the presser foot and towards the back of the machine.
Operating
1. Stitch Selection
The Singer 3337 offers 29 stitch patterns. Turn the stitch selector dial to choose your desired stitch. Refer to the stitch chart on the machine for visual guidance.
2. Stitch Length and Width Adjustment
Adjust the stitch length using the dedicated dial to control the spacing of stitches. For certain stitches, the stitch width can also be adjusted to modify the zigzag or decorative stitch appearance.
3. Sewing
- Place the fabric under the presser foot.
- Lower the presser foot lever.
- Gently press the foot pedal to start sewing. The harder you press, the faster the machine will sew.
- Guide the fabric gently with your hands, but do not push or pull it.
4. Reverse Sewing
To reinforce stitches at the beginning and end of a seam, press and hold the reverse lever/button. The machine will sew backward. Release the lever/button to resume forward sewing.
5. Free Arm Sewing
Remove the accessory storage compartment to reveal the free arm. This feature is useful for sewing cylindrical items like sleeves, pant hems, and cuffs.
Maintenance
Regular maintenance ensures the longevity and optimal performance of your sewing machine.
1. Cleaning the Bobbin Area
Lint and thread residue can accumulate in the bobbin area, affecting stitch quality. Regularly remove the needle plate and bobbin case to clean out any debris using the small brush provided or a soft brush.
2. Needle Replacement
Replace your needle regularly, especially after 8-10 hours of sewing or if it becomes bent or dull. A dull needle can cause skipped stitches or damage fabric.
3. General Cleaning
Wipe down the exterior of the machine with a soft, dry cloth. Avoid using harsh chemicals or abrasive cleaners.
Troubleshooting
Here are some common issues and their potential solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Skipped Stitches | Incorrect needle, bent needle, improper threading. | Use the correct needle for your fabric, replace bent needle, re-thread the machine correctly. |
| Thread Breaking | Incorrect tension, poor quality thread, improperly threaded. | Adjust tension, use good quality thread, re-thread both upper and bobbin threads. |
| Fabric Not Feeding | Presser foot not lowered, feed dogs clogged. | Lower the presser foot, clean lint from feed dogs. |
| Machine Jammed | Thread tangled in bobbin area. | Turn off power, remove needle plate and bobbin, clear all tangled threads. |
Specifications
- Model Number: 230132112
- Product Dimensions: 18.8 x 14 x 10.9 inches
- Item Weight: 16.7 pounds
- Brand: Singer
- Color: White
- Stitch Patterns: 29 (as indicated on packaging)
- Power Source: Corded Electric
- ASIN: B01MTOCPD9
- UPC: 037431885913

Figure 4: Product packaging displaying the model number and other product details.
Warranty and Support
Your Singer 3337 Simple Sew Machine comes with a manufacturer's warranty. Please refer to the warranty card included with your purchase for specific terms and conditions. For technical support, service, or to register your product, please visit the official Singer website or contact their customer service.
Additional support and learning resources are available through the Singer Brand Store on Amazon, the FREE Online SINGER Owner's Class, and the SINGER Sewing Assistant App.





