Singer 6600C Heavy Duty Manual

The Singer 6600C is a heavy-duty sewing machine designed for handling thick fabrics like denim, leather, and canvas with ease. It features a powerful motor, adjustable presser foot pressure, built-in stitches, automatic needle threader, drop-in bobbin system, and speed control. Below are key sections for safety, features, setup, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Unpacking and Setup 3. First-Time Operation 4. Specifications 5. Controls and Functions 6. Stitch Selection and Settings 8. Threading and Bobbin 9. Maintenance and Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Heavy-duty metal frame, powerful motor, automatic needle threader, drop-in bobbin, adjustable presser foot, built-in LED light, stitch selection dial, and speed control slider.

Feature	Description
Heavy-Duty Motor	Provides extra power for sewing through multiple layers of thick fabric
Automatic Needle Threader	Easily threads the needle with a simple lever mechanism
Drop-In Bobbin System	Top-loading bobbin for easy insertion and viewing
Adjustable Presser Foot Pressure	Allows adjustment for different fabric thicknesses
Built-in Stitches	Includes straight, zigzag, stretch, and decorative stitches
Speed Control Slider	Adjusts sewing speed from slow to fast
LED Work Light	Illuminates the sewing area for better visibility
Free Arm	Convertible for sewing sleeves and cuffs
Reverse Stitch Lever	Secures stitches at beginning and end of seams
Thread Cutter	Built-in cutter on the side of the machine

Unpacking and Setup

Carefully unpack and inspect all contents. Place on a stable, level surface.

Remove machine from box and all protective packaging.
Attach the power cord to the machine and plug into a 120V AC outlet.
Install the foot controller by plugging into the machine's port.
Attach the accessory tray if included.
Raise the presser foot and install the needle securely.

WARNING! Machine is heavy; lift with care using both hands. Ensure the work area is clean and well-lit.

First-Time Operation

Before sewing, complete initial setup and threading.

Wind the bobbin: Place thread on spool pin, guide through tension disc, and wind bobbin.
Insert bobbin: Place bobbin in case with thread pulling counterclockwise, then insert into bobbin housing.
Thread the upper thread: Follow numbered guides from spool to needle, using automatic needle threader.
Raise bobbin thread: Hold upper thread, turn handwheel toward you to bring up bobbin thread.
Select stitch: Turn stitch selection dial to desired pattern.
Test sew: Use scrap fabric to check tension and stitch quality.

CAUTION! Keep fingers away from needle area during operation. Always turn off and unplug when not in use.

Specifications

Type: Heavy-Duty Mechanical Sewing Machine
Motor: High-torque, powerful motor
Stitches: 10 built-in stitches (straight, zigzag, stretch, decorative)
Stitch Length: Adjustable up to 4mm
Stitch Width: Adjustable up to 5mm
Presser Feet: Includes general purpose, zipper, buttonhole, and blind hem feet
Bobbin: Class 15 transparent bobbin
Needle: Standard domestic needle system 130/705H
Max Sewing Speed: 1100 stitches per minute
Power Supply: 120V AC, 60Hz
Dimensions: 15.4" x 7.1" x 12.2"
Weight: 14.3 lbs

Controls and Functions

Main controls located on the right side of the machine.

Stitch Selection Dial: Turn to select different stitch patterns (numbered 1-10).

Stitch Length Dial: Adjusts length of stitches (0-4mm).

Stitch Width Dial: Adjusts width for zigzag and decorative stitches (0-5mm).

Reverse Stitch Lever: Hold down to sew in reverse for securing stitches.

Handwheel: Manually raise/lower needle and advance machine.

Presser Foot Lever: Raises and lowers presser foot.

Bobbin Winder: Located on top right for winding bobbins.

Thread Tension Dial: Adjusts upper thread tension (1-9).

Speed Control Slider: Limits maximum sewing speed.

Stitch Selection and Settings

Select appropriate stitches for different fabrics and projects.

Straight Stitch (1): For basic seams, topstitching, and basting. Adjust length for fabric weight.
Zigzag Stitch (2-4): For finishing edges, appliqué, and sewing stretch fabrics.
Stretch Stitches (5-6): For knit fabrics and areas requiring extra elasticity.
Decorative Stitches (7-10): For embellishments and decorative sewing.
Buttonhole (One-step): Use buttonhole foot for consistent, professional buttonholes.

Tip: Always test stitch settings on a scrap of your project fabric before sewing.

Threading and Bobbin

Proper threading is essential for good stitch quality.

Upper Threading: Follow numbered guides from spool pin to needle. Use automatic needle threader by pushing lever down and hooking thread through needle eye.
Bobbin Winding: Place thread on spool pin, guide through pre-tension disc, wrap around bobbin 3-4 times, push bobbin winder to right, press foot controller.
Bobbin Insertion: Place bobbin in case with thread pulling counterclockwise. Insert into bobbin housing until it clicks.
Thread Tension: Adjust dial for balanced stitches. Higher numbers for tighter tension.

WARNING! Ensure machine is off when threading. Always raise presser foot when threading upper thread.

Maintenance and Cleaning

Regular maintenance ensures optimal performance and longevity.

Unplug machine before any maintenance.
Remove needle plate screws and clean lint from feed dogs and bobbin area with brush provided.
Oil moving parts as indicated in manual (use only sewing machine oil).
Wipe exterior with soft, dry cloth. Do not use harsh chemicals.
Replace needle regularly (after 8-10 hours of sewing or when dull).
Check belt tension periodically if machine has belt drive.

CAUTION! Never use compressed air to clean machine as it can force lint deeper into mechanism.

Regulatory Information

UL Listed: Complies with UL safety standards. FCC Part 15: Class B digital device; complies with interference limits. Copyright © Singer Manufacturing Company. All trademarks are property of Singer. For support, visit www.singer.com or contact 1-800-4-SINGER.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Thread bunching underneath	Incorrect threading or bobbin insertion	Re-thread upper and lower threads completely; ensure bobbin is inserted correctly.
Needle breaks	Wrong needle type, bent needle, or incorrect insertion	Replace with new needle; ensure flat side faces back; use correct needle for fabric.
Machine won't run	Not plugged in, foot controller issue	Check power connection; ensure foot controller is properly plugged in.
Uneven stitches	Incorrect tension, wrong needle/thread combo	Adjust tension dial; match needle and thread to fabric weight.
Fabric not feeding	Presser foot pressure too low, feed dogs down	Increase presser foot pressure; ensure feed dogs are raised.
Loud noise or vibration	Lint buildup, need for oiling, loose parts	Clean and oil machine; tighten any loose screws or parts.
Automatic needle threader not working	Needle not in highest position, thread not in hook	Raise needle to highest position; ensure thread is properly placed in hook.

Reset: Unplug machine for 5 minutes to reset electronic components if applicable.

Service: 1-800-4-SINGER; www.singer.com for authorized service centers.