singer sewing machine model 620 manual

The Singer Model 620 is a classic straight-stitch sewing machine known for its durability and reliability. This manual covers essential information for setup, operation, maintenance, and troubleshooting of your machine. Below are key sections for safety, features, threading, stitch adjustment, maintenance, and problem-solving.

Features at a Glance

Key components: Heavy-duty metal frame, built-in bobbin winder, stitch length regulator, reverse stitch lever, tension dial, and built-in light.

Unpacking and Setup

Carefully unpack the machine and inspect all components. Place on a sturdy, level table.

1. Remove all packaging materials and protective covers.
2. Attach the foot pedal to the machine's power cord connector.
3. Plug the power cord into a standard 120V AC outlet.
4. Install the needle (flat side toward the back) and tighten the screw.
5. Wind and insert the bobbin following the threading guide.

WARNING! Ensure the machine is unplugged during initial setup to prevent accidental start-up.

First-Time Operation

Before sewing your first project, perform these initial steps.

1. Thread the machine: Follow the numbered threading path on the machine.
2. Insert bobbin: Place wound bobbin in case, pull thread through slot.
3. Raise presser foot and pull up bobbin thread.
4. Test on scrap fabric: Set stitch length to medium (2.5) and sew a few lines.
5. Adjust tension if stitches are uneven (top thread too tight or loose).

CAUTION! Keep fingers away from the needle area while the machine is running.

Specifications

• Model: Singer 620
• Stitch Type: Straight Stitch
• Stitch Length: 0-4 mm adjustable
• Maximum Sewing Speed: Up to 1100 stitches per minute
• Bobbin: Class 15, front-loading
• Needle System: 15x1 (HAx1)
• Presser Feet: Standard snap-on system
• Dimensions: 15" L x 7" W x 12" H (approx.)
• Weight: 22 lbs
• Power: 120V, 60Hz, 0.7 Amp motor

Controls and Functions

Main controls are located on the right side of the machine body.

Stitch Length Dial: Rotate to set desired stitch length (higher number = longer stitch).

Reverse Stitch Lever: Hold down to sew in reverse for seam reinforcement.

Tension Dial: Adjust top thread tension (4 is normal, lower for lighter fabrics, higher for heavier).

Presser Foot Lever: Raises and lowers the presser foot.

Handwheel: Turn manually toward you to raise/lower needle and advance machine slowly.

Bobbin Winder: Located at top right; disengages needle mechanism when winding bobbin.

Threading the Machine

Correct threading is essential for proper stitch formation.

1. Raise presser foot and raise needle to highest position using handwheel.
2. Place spool on spool pin.
3. Follow numbered guide: Thread through first thread guide, down tension assembly, up take-up lever, down to needle.
4. Thread needle from front to back.
5. For bobbin: Wind bobbin on winder, place in bobbin case with thread coming off clockwise, pull through tension spring.
6. Insert bobbin case into machine.

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

Stitch Adjustment & Techniques

Mastering basic adjustments improves sewing results.

1. Stitch Length: Use shorter stitches (1.5-2) for fine fabrics, longer (3-4) for basting or heavy fabrics.
2. Tension: Balanced tension shows threads locked in middle of fabric. Adjust top tension if loops appear on top or bottom.
3. Reverse Stitching: Sew a few stitches reverse at beginning and end of seam to lock.
4. Seam Guides: Use lines on needle plate for straight seams.
5. Different Fabrics: Adjust presser foot pressure for thick or multiple layers.

WARNING! Do not force fabric; let feed dogs move it naturally.

Maintenance & Lubrication

Regular maintenance ensures smooth operation and longevity.

Weekly: Clean lint from bobbin area and feed dogs with small brush.

Monthly: Oil moving parts per lubrication diagram (use only sewing machine oil).

CAUTION! Unplug machine before cleaning or oiling. Wipe excess oil to avoid staining fabric.

Needle & Bobbin Replacement

Replace needle regularly (after 8-10 hours of sewing) or if bent/dull.

1. Loosen needle clamp screw and remove old needle.
2. Insert new needle with flat side toward back, push up fully, tighten screw.
3. Bobbin replacement: Remove bobbin case, insert new wound bobbin with thread clockwise.

Use correct needle type: Size 11/80 for light fabrics, 14/90 for medium, 16/100 for heavy.

Safety Information

Always unplug machine when not in use, during threading, needle changes, or cleaning. Do not operate with damaged cord. Keep hands away from moving parts. Use in dry, well-ventilated area. Not intended for children.

Troubleshooting

Service: For persistent issues, contact authorized Singer service center. Visit www.singer.com or call 1-800-4-SINGER for support.