Elevate Your Sewing Projects to Professional Standards

The Janome 634D serger, also known as the MyLock 634D, stands out as a powerful tool designed to enhance the efficiency and quality of your sewing projects. Renowned for its reliable performance and intuitive design, the 634D serger is an excellent choice for sewists looking to upgrade their crafting capabilities. Here’s why this serger might just be the perfect addition to your sewing room:

Key Features of the Janome 634D Serger

Janome 634D

Versatile Stitching Options

The MyLock 634D offers flexible 2, 3, or 4-thread overlock stitching, making it adaptable to a variety of fabrics and sewing needs. Whether you’re finishing raw edges, constructing durable seams, or crafting decorative accents, this serger delivers with precision.

User-Friendly Threading System

Threading a serger can often be a daunting task, but the Janome 634D simplifies this process with its color-coded thread guides and easy-access lower looper threading system. This setup minimizes the hassle and reduces setup time significantly, allowing you to start your projects faster.

Quick Transition to Rolled Hemming

Switching to rolled hemming usually requires changing the needle plate, which can be time-consuming. However, the 634D makes this transition effortless without the need to switch plates, enabling you to easily add elegant finishes to your garments and home décor items.

Reliable Janome Quality

Janome’s reputation for crafting durable, well-designed machines is well-earned, and the 634D is no exception. Built to last and packed with thoughtful features, this serger is a testament to the brand’s commitment to quality and user satisfaction.

Why Choose the Janome 634D?

Professional Results

With its robust design and versatile stitch capabilities, the 634D ensures that every project you undertake has a neat, professional look. The tight stitches not only enhance the appearance of your garments but also improve their durability.

Speed and Efficiency

Capable of executing precise stitches rapidly, the 634D enhances your productivity, allowing you to complete projects quicker than ever. This efficiency makes it an ideal serger for both hobbyists who value their crafting time and professionals who need to meet tight deadlines.

Ease of Use

Designed with the user in mind, the 634D features intuitive controls and clear markings, which make operating the machine straightforward even for those new to serging. This ease of use ensures a smooth learning curve and a more enjoyable sewing experience.

Fabric Compatibility for the Janome 634D Serger

When working with any serger, including the Janome 634D, it’s important to understand which types of fabrics are best suited for the machine to ensure optimal results and to avoid potential damage. Here’s a detailed look at the fabrics that work well with the Janome 634D, as well as those that might pose challenges.

Fabrics That Work Well with the Janome 634D

  1. Natural Fibers:
    • Cotton, Linen, Wool: These are staple fibers in sewing and work exceptionally well with the 634D, handling everything from delicate cotton voiles to heavier woolens.
  2. Fine Fabrics:
    • Silk, Satin, Taffeta, Velvet: The 634D can handle these luxurious fabrics with the proper settings, typically by adjusting tension and using appropriate needles.
  3. Knits:
    • The serger is particularly adept at handling knit fabrics, providing clean and stretchable seams that are essential for knit garment construction.
  4. Synthetic Fabrics/Blends:
    • Rayon, Polyester: Synthetics and blends are well-suited for serging, especially for constructing durable seams and edges.
  5. Denim:
    • The 634D can handle lighter to medium-weight denim, making it suitable for most denim projects that don’t involve too many layers.
  6. Upholstery:
    • Light to medium upholstery fabrics can be serged with the 634D, ideal for home decor projects.

Fabrics That Don’t Work Well

  1. Leather/Suede:
    • These materials are generally too thick and can be difficult to feed through a serger without risking damage to the machine or the material.
  2. Fur:
    • Like leather, fur is thick and can clog the machine or result in uneven stitching.
  3. Reptile Skin:
    • This is another specialty material that is typically too tough for a standard serger.
  4. Canvas/Twill:
    • Heavyweight canvas and twill might be too dense, especially when multiple layers are involved.
  5. Plastic/Rubber:
    • These materials can stick to the machine parts and are not ideal for serging as they may require specific types of needles and settings.
  6. Extra Thick Fabrics or Multiple Layers:
    • Overloading the machine with very thick materials or multiple layers can lead to poor stitch quality, broken needles, or even damage to the serger.

Tips for Serging Various Fabrics

  • Test First: Always test your settings on a scrap piece of your project’s fabric. Adjust the tension, differential feed, and presser foot pressure accordingly.
  • Needle Selection: Ensure you are using the correct needle type and size for the fabric you are working with.
  • Regular Maintenance: Keep your serger clean and well-oiled, and replace the blades as needed to maintain optimal performance, especially after working with tougher materials.

Key Features of the Janome 634D Serger

The Janome 634D serger is designed to offer a versatile and efficient sewing experience, making it an excellent choice for both beginners and experienced sewists looking to enhance their serging capabilities. Here’s an overview of its key features:

Versatile Stitch Options

  • 2, 3, and 4 Thread Stitch Options: Provides flexibility to adjust the serger for different types of finishes and fabric weights, allowing for fine control over seam quality and durability.

Enhanced Functionality

  • Retractable Upper Knife: Allows you to disable the cutting function when you do not want the edges of your fabric trimmed, offering greater versatility in serging applications.
  • Quick Change Rolled Hem: Enables easy shifting between serging and rolled hemming without changing the needle plate. This feature is great for creating decorative edges and finishing hems quickly.
  • Adjustable Stitch Length and Width: Stitch length can be adjusted from 1mm to 5mm, and cutting width from 3.1mm to 7.3mm, providing excellent adaptability for different project requirements.
  • Differential Feed: Adjustable from 0.5 to 2.25, this feature helps prevent puckering and stretching on all types of fabrics, ensuring smooth, even stitches.

User-Friendly Design

  • Easy Threading System: Color-coded guides and a threading chart printed directly on the machine make threading easy and straightforward, reducing setup time and frustration.
  • Lay-in Thread Tension Dial: Simplifies tension adjustments, helping you achieve the perfect tension for each type of thread and fabric.
  • Tension Release Device: Makes threading easier by releasing the tension while the presser foot is up, allowing for smooth thread changes.

Practical Extras

  • Snap-on Presser Feet: Allows for quick and easy changes between different feet, enhancing the machine’s versatility for various sewing tasks.
  • Easily Accessible Lower Looper Guides: Simplifies the process of threading the lower loopers, which is often one of the more challenging aspects of setting up a serger.
  • Waste Chip Box: Collects fabric trimmings and other debris, keeping your workspace clean and ensuring that your machine remains unobstructed and running smoothly.

Efficiency and Speed

  • Maximum Speed of 1,300 Stitches Per Minute (spm): Enables you to complete projects quickly, which is ideal for high-volume sewing or when working under tight deadlines.

Construction and Durability

  • Adjustable Foot Pressure: This allows you to adjust the presser foot’s pressure to match the thickness of the fabric, ensuring even, consistent stitching without stretching the fabric.

Standard and Optional Accessories for the Janome 634D Serger

The Janome 634D serger comes equipped with essential accessories that facilitate basic serging tasks, as well as optional extras that can enhance your sewing experience and expand the machine’s capabilities.

Standard Accessories

The standard accessories included with the Janome 634D are designed to cover basic maintenance and operational needs:

  • Standard Serger Needles: Specifically designed for use with the Janome 634D, these needles ensure optimal performance and are tailored to handle a variety of fabric types.
  • Tweezers: Helpful for threading needles and inserting or removing threads from the machine, especially in tight spaces.
  • Screwdriver (Large): Useful for general maintenance and adjustments, such as changing needles or opening the machine’s panels for cleaning.
  • Lint Brush: Essential for keeping the machine clean; regular removal of lint and thread debris helps maintain the serger’s performance and longevity.

Optional Accessories

Optional accessories for the Janome 634D serger enhance its versatility and allow you to undertake a wider range of sewing projects:

  • 75 Million Logo Case with 25 Blue Bobbins: Keeps your bobbins organized and protected, ensuring that threads remain untangled and ready for use.
  • Beading Attachment: Allows you to add beads to your projects, offering a decorative touch to garments and crafts.
  • Blind Stitch Foot: Facilitates the creation of invisible hems and finishes, ideal for tailored garments and formal wear.
  • Cloth Guide: Assists in sewing straight, even seams by guiding the fabric at a consistent distance from the needle.
  • Gathering Attachment and Gathering Foot: Helps to easily gather fabric, perfect for ruffles and decorative effects in skirts, dresses, and curtains.
  • Universal Needle and Ball Point Needles (Sizes #11 and #14): These needles are designed to handle different fabric weights and types, with ball point needles specifically meant for knitting fabrics to prevent snagging.
  • Needle Threader: Simplifies the threading process, reducing eye strain and saving time.
  • Piping Feet (1/8″, 3/16″, and Set 3mm 5mm): Ideal for inserting piping into seams for a professional finish on upholstery and garment edges.
  • Purple Tip Needle: Engineered for heavy fabrics or multiple layers, these needles reduce skipped stitches and thread breakage.
  • Seam Ripper BP: An indispensable tool for quickly undoing stitches and cutting threads without damaging the fabric.
  • Taping Foot with Reel: Enables the addition of tapes and ribbons while sewing, ideal for finishing edges or adding decorative details.

Maintenance Schedule for the Janome 634D Serger

Proper maintenance is essential to keep your Janome 634D serger operating smoothly and extend its lifespan. Here’s a guide on how to maintain your machine effectively, based on usage:

Routine Maintenance

  1. Clean Race Hook and Feed Dogs
    • After Each Use: Remove any lint, threads, or small fabric pieces from the race hook and feed the dogs. This area can accumulate debris quickly, especially with frequent use. Keeping it clean ensures smooth fabric feeding and prevents mechanical issues.

Periodic Maintenance

  1. Wipe Head with a Soft Dry Cloth
    • As Needed: Dust off the exterior of the machine to keep it clean. This is particularly important if your serging environment generates a lot of dust or if the machine sits idle for extended periods.
  2. Wipe Head with a Soft Damp Cloth
    • As Needed: If there are marks or stains on the machine, gently wipe them down with a slightly damp cloth. Avoid letting moisture enter any of the mechanical parts.

Annual Maintenance

  1. Service by Sewing Machine Repair Professional
    • Once Each Year: Even if the machine appears to be in good working order, it’s advisable to have it professionally serviced. A qualified technician will clean, adjust, and inspect the serger to ensure everything is in optimal condition. They can catch issues that may not be obvious but could cause problems down the line.

No Regular Lubrication Required

  1. Lubricate
    • No Regular Lubrication Needed: The Janome 634D is designed not to require regular oiling by the user. If lubrication is needed, it should be performed by a professional during the annual service to ensure it’s done correctly.

Tips for Effective Maintenance

  • Keep Your Serger Covered: Use a cover when the machine is not in use to protect it from dust.
  • Change Needles Regularly: Dull or bent needles can affect stitch quality and potentially damage the fabric or the machine.
  • Check Thread Quality: Use good quality thread to minimize lint buildup and reduce the risk of tension issues.
  • Practice Good Habits: Always turn off and unplug the machine before performing any maintenance tasks.

Specifications of the Janome 634D Serger

The Janome 634D serger is a versatile and robust machine designed to meet the needs of both beginners and experienced sewists. It offers a wide range of features that streamline the serging process and enhance the quality of finished projects. Here’s a breakdown of its key specifications:

Sewing Capabilities

  • Number of Threads: Offers 2-3-4 thread serger options, providing versatility for various types of finishes, from delicate rolled hems to strong overlock stitches.
  • Stitch Length Adjustment: Adjustable from 1.0mm to 5.0mm, allowing for precise control over stitch density and appearance.
  • Differential Feed Adjustment: Ranges from 0.5mm to 2.25mm, which is crucial for working with stretchy or slippery fabrics to prevent puckering or unwanted gathers.
  • Cutting Width Adjustment: Can be set between 3.1mm and 7.3mm, enabling customization of the seam width for perfect edges.

Ease of Use Features

  • Easy Lay-in Threading: Simplifies the threading process with color-coded guides and a clear threading chart, making the machine easier to set up.
  • Quick Change Rolled Hem: Allows for easy switching between serging and rolled hemming without changing the needle plate.
  • Easily Accessible Lower Looper Guides: Facilitates threading of the lower looper, which is often a challenging aspect of using a serger.
  • Easily Retractable Upper Knife: Can be quickly disengaged, enabling you to serge without trimming the fabric, which is particularly useful for decorative edging.

Design and Construction

  • Type of Tension: Manual dials provide precise control over thread tension, ensuring balanced stitches across a wide variety of fabric types.
  • Presser Foot: Features a snap-on mechanism for quick and easy changes, accommodating various sewing needs.
  • Machine Weight: At 16.6 lbs, it strikes a balance between stability and portability.

Additional Functional Features

  • Maximum Speed: Capable of up to 1,300 stitches per minute (SPM), allowing for efficient sewing on large projects.
  • Adjustable Foot Pressure: Enables you to adjust the pressure on the fabric, which is vital for handling different types of materials effectively.
  • Tension Release Lever: Helps in easy threading by temporarily releasing the tension, facilitating smoother thread changes.
  • Lower Looper Pretension Setting Slider: Provides additional control over thread tension, enhancing the finish on various fabrics.

Convenience and Maintenance

  • Cover: Includes a dust cover to protect the machine from lint and dust when not in use.
  • Pattern Selection Stitch Information Display: Offers dials with a display for selecting and viewing stitch settings easily.

Power and Voltage

  • Dual Voltage: This model does not support dual voltage, which means it is configured for the standard voltage of the region in which it is sold.

Pros and Cons of the Janome 634D Serger


  1. Versatile Stitch Options: With 2-3-4 thread capability, the Janome 634D allows for a wide range of stitch types, making it suitable for everything from delicate fabrics to robust seams on heavier materials.
  2. Ease of Use: Features such as easy lay-in threading, color-coded thread guides, and a clear threading chart simplify the machine setup, making it accessible for beginners while still being efficient for experienced users.
  3. Quick Change Rolled Hem: Enables seamless transitions between standard serging and rolled hemming without the need to change the needle plate, enhancing productivity and flexibility in projects.
  4. Adjustable Settings: The serger includes adjustable stitch length, differential feed, and cutting width, which provides fine control over the finishing of seams and edges, suitable for various fabrics and sewing needs.
  5. Built-in Convenience Features: Equipped with an easily retractable upper knife, adjustable foot pressure, and a tension release lever, all designed to improve the sewing experience and fabric handling.
  6. Robust Construction: At 16.6 lbs, the machine is stable enough for consistent sewing yet light enough for portability and easy storage.


  1. Manual Tension Dials: While offering precise control, manual tension adjustments can be a challenge for beginners who may prefer automated systems for ease of use.
  2. Limited on Advanced Embellishments: Lacks built-in capabilities for cover stitching, which might be a limitation for those looking to perform more complex decorative work with their serger.
  3. No Dual Voltage Support: The absence of dual voltage capability means it cannot be easily used internationally without appropriate voltage converters, limiting its portability across different regions.
  4. Learning Curve: Despite the easy threading system, sergers in general, including the Janome 634D, have a learning curve, especially for those new to serging.
  5. Accessories Needed: While it comes with several useful accessories, to fully utilize its capabilities, additional purchases may be necessary, such as different serging feet or specialty needles, which can add to the overall cost.
This Video is Taken From Youtube


The Janome 634D serger is a strong performer for both home and semi-professional sewists. It offers a blend of essential features that enhance sewing projects with clean finishes and durable seams. However, the lack of some advanced features and the manual tension settings might not appeal to all users. Overall, it’s an excellent choice for those looking for a reliable, user-friendly serger that can handle a wide range of fabrics and sewing applications.

FAQs for the Janome 634D Serger

What types of stitches can the Janome 634D perform?

The Janome 634D serger is capable of 2, 3, or 4-thread overlock stitching. This versatility allows you to adapt the machine for different types of finishes and fabric weights, making it ideal for a wide range of projects from delicate garments to sturdy home decor.

Is the Janome 634D suitable for beginners?

Yes, the Janome 634D is designed to be user-friendly, making it a good choice for beginners. Features like easy lay-in threading, color-coded thread guides, and the threading chart simplify the machine setup. Additionally, the quick change to rolled hem and the easily accessible lower looper guides enhance its ease of use.

How do I thread the Janome 634D serger?

Threading the Janome 634D is simplified with color-coded thread guides and a detailed threading chart right on the machine. Follow the color-coded paths and refer to the chart for step-by-step instructions to correctly set up each thread.

Can the Janome 634D handle heavy fabrics like denim?

Yes, the Janome 634D can serge heavy fabrics like denim, especially when using the appropriate needles and settings. It’s important to adjust the differential feed and stitch length accordingly and ensure the cutting width is set correctly for the best results.

How do I switch to rolled hemming on the Janome 634D?

Switching to rolled hemming on the Janome 634D does not require changing the needle plate. Simply disengage the cutting blade, adjust the settings for rolled hemming as per the manual, and you’re ready to go. This feature makes it easy to create decorative edges and hems.

What should I do if my Janome 634D is skipping stitches?

If your Janome 634D serger starts skipping stitches, check the following:

  • Ensure the machine is correctly threaded.
  • Check that the needles are inserted correctly and are not bent or dull.
  • Adjust the thread tension dials as needed.
  • Verify that you are using the correct needles and threads for your fabric type.

How often should I clean my Janome 634D serger?

It is recommended to clean your Janome 634D after each project to remove lint and debris from the race hook and feed dogs. This helps maintain the machine’s performance and prolongs its lifespan. Refer to the user manual for specific instructions on how to clean your serger properly.

What maintenance does the Janome 634D require?

Beyond regular cleaning, the Janome 634D should be professionally serviced at least once a year to ensure it remains in optimal working condition. This service typically includes a thorough cleaning, lubrication, and adjustment of the machine’s internal mechanisms.

Does the Janome 634D come with a warranty?

Yes, the Janome 634D typically comes with a limited warranty that covers parts and labor for a certain period after purchase. Check with your dealer or refer to your warranty documentation for specific details and conditions.

What accessories come standard with the Janome 634D?

The Janome 634D comes with several essential accessories, including standard serger needles, tweezers, a large screwdriver, and a lint brush. These tools are designed to help maintain the serger and facilitate easier setup and use.

Can the Janome 634D create a cover stitch?

No, the Janome 634D does not have cover stitch capability. It is primarily designed for overlocking. For cover stitching, you would need a machine specifically equipped with that function or a combination machine that includes both serging and cover stitch capabilities.

What is the maximum sewing speed of the Janome 634D?

The Janome 634D can operate at a maximum speed of 1,300 stitches per minute (SPM). This high speed allows you to complete projects efficiently, making it ideal for those who need to work quickly or are handling large volumes of sewing tasks.

How do I adjust the differential feed on the Janome 634D?

The differential feed on the Janome 634D can be adjusted using a dial on the machine. The differential feed ratio ranges from 0.5 to 2.25, which helps you manage how the fabric is fed through the machine, preventing issues like puckering or stretching, especially in knit fabrics.

Is the Janome 634D noisy?

Like most sergers, the Janome 634D can generate noise during operation, particularly at high speeds. However, it is designed to minimize excess noise and vibration, ensuring a more comfortable sewing experience.

How should I store my Janome 634D when not in use?

When not in use, it’s best to store the Janome 634D covered with its dust cover to protect it from dust and debris. Store it in a dry, cool place away from direct sunlight to prevent any potential damage to its internal components or outer casing.

Can I use the Janome 634D for commercial purposes?

While the Janome 634D is robust and capable of handling a wide range of fabrics and projects, it is primarily designed for home use or small-scale production. If you have commercial needs, consider a professional-grade serger that can handle continuous, heavy-duty use.

What should I do if the fabric is not feeding properly?

If fabric is not feeding properly through your Janome 634D, first check to ensure the presser foot pressure is correctly adjusted for the type of fabric you are using. Also, inspect the feed dogs to ensure they are clean and raised enough to engage the fabric. Adjusting the differential feed may also help accommodate different fabric types.

How do I replace the blade on my Janome 634D?

To replace the blade on the Janome 634D, you will need to follow the instructions provided in the user manual, as it involves accessing the internal mechanisms of the machine. Always ensure the machine is turned off and unplugged before attempting any replacements or maintenance.

All Used Image Credit : Janome

Similar Posts

Disclaimer:This post may contain affiliate links, which means I’ll receive a commission if you purchase through my links, at no extra cost to you. Please read disclosure for more information..