janome serger 634d manual

The Janome 634D Serger is a professional-grade 3/4 thread overlock machine designed for creating clean, finished edges on fabrics. It features differential feed for handling various fabric types, easy threading system, rolled hem capability, stitch length and width adjustments, built-in rolled hem foot, and free arm capability. Below are key sections for safety, features, setup, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: 3/4 thread overlock capability, differential feed system, color-coded threading, built-in rolled hem, free arm design, stitch length/width controls.

Safety Instructions

Read all instructions before operating the serger.

1. Always disconnect power when threading or cleaning.
2. Keep fingers away from moving needles and cutting blade.
3. Use proper lighting in work area.
4. Do not operate with damaged cord or plug.

WARNING! Never place hands near cutting blade while machine is running. Always turn off when not in use.

Machine Setup

Unpack and assemble your serger following these steps.

1. Place machine on stable, level surface.
2. Remove all packaging materials and tape.
3. Install foot control and power cord.
4. Thread machine following color-coded guides.
5. Insert needles properly (flat side to back).
6. Test on scrap fabric before starting project.

CAUTION! Ensure machine is properly threaded to prevent thread jams and needle breakage.

Specifications

• Type: 3/4 Thread Overlock Serger
• 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 x 2
• Thread Tension: Individual dials for each thread
• Power Requirements: 110V, 60Hz
• Weight: 15.4 lbs (7 kg)
• Dimensions: 13.4" x 9.8" x 12.2"

Controls and Functions

Main controls located on front and side of machine.

Front Panel: Power switch, stitch length dial, stitch width dial, differential feed dial, tension controls (4 dials).

Side Features: Handwheel, free arm release, accessory storage, LED light switch.

Stitch Length: Controls density of stitches (1-4mm). Stitch Width: Adjusts width of overlock stitch (3-7mm). Differential Feed: Prevents stretching (lower setting) or gathering (higher setting). Tension Dials: Upper looper, lower looper, right needle, left needle tensions.

Threading the Machine

Follow color-coded threading path for optimal performance.

1. Raise presser foot and turn handwheel to highest needle position.
2. Follow numbered threading guides (1-4) in order.
3. Thread upper looper (blue guide) first.
4. Thread lower looper (green guide) second.
5. Thread right needle (red guide) third.
6. Thread left needle (yellow guide) last if using 4-thread.
7. Pull threads under presser foot toward back.

Tip: Always thread with presser foot raised to open tension discs.

Basic Serging Techniques

Master these fundamental serging operations.

1. Standard Overlock: Use 3 or 4 threads for seam finishing.
2. Rolled Hem: Switch to rolled hem setting and use appropriate foot.
3. Flatlocking: Loosen needle tension and use differential feed.
4. Gathering: Increase differential feed ratio to 2.0.
5. Lettuce Edge: Stretch knit fabric while serging.
6. Seam Sewing: Serge seams with 1/4" seam allowance.
7. Decorative Edges: Use decorative threads in loopers.

WARNING! Always test stitch settings on scrap fabric before working on your project.

Maintenance & Cleaning

Regular maintenance ensures optimal performance.

1. Unplug machine before cleaning.
2. Remove lint buildup with brush after each use.
3. Oil machine as indicated in manual (specific points).
4. Wipe exterior with soft, dry cloth.
5. Replace needles regularly (every 8-10 hours of use).
6. Have machine serviced annually by authorized technician.

CAUTION! Do not use compressed air for cleaning as it can force lint into mechanisms.

Accessories

Standard accessories included with your 634D serger.

Warranty Information

Janome 634D comes with limited warranty. 25-year warranty on mechanical parts, 5-year on electronic components, 1-year labor. Warranty valid only when purchased from authorized dealer. Keep original receipt for warranty claims. For service, contact authorized Janome service center.

Troubleshooting

Service: Contact authorized Janome service center at 1-800-631-0183 or visit www.janome.com