Janome 634D Serger Manual

The Janome 634D is a professional-grade 3/4 thread serger with differential feed, built-in rolled hem capability, color-coded threading system, free arm capability, built-in thread cutter, and adjustable stitch length and width. Designed for home sewing enthusiasts and professionals, it handles a variety of fabrics from lightweight to heavy-duty materials. Below are key sections for safety, features, setup, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Color-coded threading system, differential feed mechanism, free arm, built-in rolled hem, stitch length/width controls, built-in thread cutter.

Installation & Setup

Unpack and inspect all components. Place on stable sewing table.

1. Remove packaging materials and protective covers
2. Attach power cord to machine and plug into outlet
3. Install presser foot: Lower presser foot lever and snap foot into place
4. Wind and install loopers: Follow color-coded threading diagram
5. Insert needles: Ensure needles are fully inserted and tightened
6. Thread machine: Follow numbered threading sequence

WARNING! Keep fingers away from needles during operation. Always turn off when threading or changing settings.

First-Time Operation

Power on serger; test on scrap fabric first.

1. Select basic overlook stitch: Set stitch length to 2.5mm, width to 5mm
2. Set differential feed to N (normal) position
3. Place fabric under presser foot, lower foot lever
4. Gently press foot control to begin sewing
5. Guide fabric evenly without pulling or pushing
6. Use built-in thread cutter to trim threads when finished

CAUTION! Always use proper needle for fabric type. Test stitches on scrap fabric first.

Specifications

• Type: 3/4 Thread Serger with Differential Feed
• Stitches: Overlock, rolled hem, flatlock, ribbon lock
• Stitch Length: 1-4mm adjustable
• Stitch Width: 3-7mm adjustable
• Differential Feed Ratio: 0.7-2.0
• Speed: Up to 1300 stitches per minute
• Needles: HAx1 SP system needles
• Thread: Standard serger threads
• Power Requirements: 120V, 60Hz
• Dimensions: Standard serger size with free arm capability

Controls and Settings

Main controls located on front and side panels. Tension dials for upper looper, lower looper, and needles.

Front Panel: Stitch length dial, stitch width dial, differential feed control, presser foot lever, thread cutter.

Stitch Length: 1mm (short) to 4mm (long). Stitch Width: 3mm (narrow) to 7mm (wide). Differential Feed: 0.7 (gather) to 2.0 (stretch). Tension Dials: 0-9 settings for each thread path. Rolled Hem Lever: Engages rolled hem function.

Threading the Serger

Follow color-coded threading system in numerical order.

1. Turn machine off before threading
2. Follow numbered guides: 1 (upper looper), 2 (lower looper), 3 (right needle), 4 (left needle)
3. Ensure threads are properly seated in tension discs
4. Thread loopers with presser foot raised
5. Pull threads under presser foot before starting
6. Test tension on scrap fabric

Tip: Use tweezers for difficult threading areas. Always rethread completely if thread breaks.

Stitch Selection & Techniques

Supports multiple stitch types for various sewing applications.

1. Basic Overlock: Standard 3-4 thread seam finishing
2. Rolled Hem: Engage rolled hem lever for narrow hems
3. Flatlock: Creates decorative flat seams
4. Gathering: Set differential feed above 1.5
5. Stretch Prevention: Set differential feed below 1.0
6. Decorative Stitches: Use specialty threads and settings
7. Seam Finishing: Clean finished edges on woven fabrics
8. Knits: Use appropriate tension for stretch fabrics

WARNING! Always test new stitches on scrap fabric. Adjust tension gradually.

Maintenance & Cleaning

Regular maintenance ensures optimal performance. Unplug before cleaning.

1. Remove lint buildup with brush after each use
2. Oil machine according to maintenance schedule
3. Check needle condition regularly
4. Clean feed dogs and throat plate
5. Inspect loopers for wear or damage
6. Store covered when not in use

CAUTION! Use only Janome recommended oil. Do not use compressed air for cleaning.

Accessories

Standard accessories included with Janome 634D serger.

Warranty Information

Janome 634D comes with limited warranty covering manufacturing defects. Warranty period: 25 years for mechanical parts, 2 years for electronic components, 1 year for labor. Registration required within 10 days of purchase. For service, contact authorized Janome dealers only. Keep receipt as proof of purchase.

Troubleshooting

Service: Contact authorized Janome service center. Do not attempt internal repairs.

Support: 1-800-631-0183; www.janome.com