Janome 634D Overlocker Instruction Manual

The Janome 634D is a professional-grade 3/4 thread overlocker with differential feed, built-in rolled hem capability, color-coded threading system, adjustable stitch length and width, free arm capability, built-in thread cutter, and LED lighting. Designed for home and professional use with easy threading and versatile stitch options. 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, stitch length/width dials, free arm, built-in thread cutter, LED work light.

Installation & Setup

Unpack and inspect contents. Place on stable sewing table.

1. Remove packaging materials and protective covers
2. Attach extension table if included
3. Install foot control and power cord
4. Place machine on stable, level surface
5. Plug into appropriate power outlet

WARNING! Machine is heavy; lift with care to avoid injury. Ensure power cord is undamaged.

First-Time Operation

Power on machine; follow threading guide.

1. Thread machine following color-coded guides
2. Insert needle properly with flat side to back
3. Test stitch on scrap fabric
4. Adjust tension settings as needed
5. Practice basic overlock stitches

CAUTION! Keep fingers away from moving needle. Always use proper needle for fabric type.

Specifications

• Machine Type: 3/4 Thread Overlocker
• Stitch Length: 1-4mm adjustable
• Stitch Width: 3.5-7mm adjustable
• Differential Feed: 0.7-2.0 ratio
• Speed: Up to 1300 stitches per minute
• Needles: Standard overlock needles
• Thread: Standard overlock thread
• Power Source: 110-120V AC, 60Hz
• Weight: Approximately 15.4 lbs (7kg)
• Dimensions: 15.7" x 11.8" x 13.8"

Controls and Settings

Main controls: Stitch length dial, stitch width dial, differential feed dial, tension dials, power switch.

Stitch Length: 1mm (short) to 4mm (long) - adjust for fabric type

Stitch Width: 3.5mm (narrow) to 7mm (wide) - adjust for seam finish

Differential Feed: 0.7 (gathering) to 2.0 (stretching) - prevents fabric distortion

Thread Tension: Four dials (upper looper, lower looper, right needle, left needle) - adjust for balanced stitches

Threading Instructions

Follow color-coded threading path for easy setup.

1. Raise presser foot and needle to highest position
2. Follow numbered threading sequence
3. Use color-coded guides for each thread path
4. Ensure threads are properly seated in tension discs
5. Pull threads under presser foot toward back

Tip: Always thread with presser foot raised to ensure proper tension disc engagement.

Stitch Selection

Versatile stitch options for various sewing applications.

1. Basic Overlock: 3-thread for general sewing
2. Rolled Hem: Narrow hem for lightweight fabrics
3. Flatlock: Decorative seam for sportswear
4. Gathering: Use differential feed for controlled gathers
5. Coverstitch: 4-thread for professional finishes

WARNING! Always test stitch on scrap fabric before sewing project. Adjust tensions as needed.

Maintenance & Cleaning

Regular maintenance ensures optimal performance.

1. Clean lint buildup after each project
2. Oil moving parts as per manual instructions
3. Check needle regularly for damage
4. Clean feed dogs and loopers
5. Store covered when not in use

CAUTION! Unplug machine before cleaning or maintenance. Use only recommended oils.

Safety Information

Always follow safety guidelines when operating overlocker.

• Keep fingers away from moving needle
• Unplug when not in use or during maintenance
• Use proper lighting for visibility
• Keep work area clean and organized
• Do not operate with damaged power cord

Troubleshooting

Service: Contact authorized Janome service center for technical issues

Support: Visit www.janome.com or contact customer service