Mercury M-337 Sewing Machine Manual

The Mercury M-337 is a versatile household sewing machine featuring 37 built-in stitches, one-step buttonhole, automatic needle threader, adjustable stitch length and width, free arm capability, built-in LED light, top drop-in bobbin system, and multiple presser feet. Powered by 110-120V AC, this machine is ideal for beginners and experienced sewers alike. Below are key sections for safety, features, setup, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: 37 built-in stitches, automatic needle threader, free arm, LED work light, top drop-in bobbin, multiple presser feet included.

Installation and Setup

Unpack and inspect all contents. Place on stable, level surface.

1. Remove packaging materials and protective covers from machine.
2. Attach foot controller to machine and plug into power outlet.
3. Install needle: Loosen needle clamp screw, insert needle with flat side to back, tighten screw.
4. Wind bobbin: Place thread on spool pin, follow threading guide, wind bobbin evenly.
5. Insert bobbin: Open bobbin cover, drop in bobbin with thread unwinding counterclockwise.

WARNING! Keep fingers away from needle area during operation. Always unplug machine when not in use.

First-Time Operation

Plug in machine and turn on power switch. Follow these steps for initial setup.

1. Thread upper thread: Follow numbered threading path on machine, use automatic needle threader.
2. Pull up bobbin thread: Hold upper thread, turn hand wheel toward you to bring up bobbin thread.
3. Select basic straight stitch: Turn stitch selection dial to straight stitch position.
4. Test sew: Place fabric under presser foot, lower foot, and gently press foot controller.
5. Adjust tension: Start with default setting (4), adjust if stitches are too loose or tight.

CAUTION! Always use proper needle for fabric type. Replace bent or damaged needles immediately.

Specifications

• Stitches: 37 built-in stitches (straight, zigzag, decorative, stretch)
• Buttonhole: One-step automatic buttonhole
• Stitch Length: Adjustable 0-4mm
• Stitch Width: Adjustable 0-5mm
• Needle System: HA-1, 15x1
• Bobbin: Top drop-in, class 15 transparent
• Presser Feet: 4 included (zigzag, zipper, buttonhole, button sewing)
• Lighting: Built-in LED work light
• Power: 110-120V AC, 60Hz
• Dimensions: 15.4" x 7.1" x 11.8"
• Weight: 12.1 lbs

Controls and Settings

Main controls located on front and side of machine. Stitch selection dial, stitch length dial, stitch width dial, reverse button, power switch.

Stitch Selection: Turn dial to select from 37 built-in stitches. Stitch Length: Adjust from 0-4mm (0 for darning, 4 for basting). Stitch Width: Adjust from 0-5mm for zigzag and decorative stitches. Reverse: Hold button to sew in reverse for seam reinforcement. Tension Control: Adjust thread tension dial (3-5 for most fabrics).

Stitch Selection Guide

Select appropriate stitch for your sewing project from the 37 available options.

1. Straight Stitch (1-3): Basic sewing, topstitching, quilting
2. Zigzag Stitch (4-6): Seam finishing, appliqué, stretch fabrics
3. Blind Hem Stitch (7): Nearly invisible hemming
4. Elastic Stitch (8-10): Sewing elastic, decorative stretch seams
5. Decorative Stitches (11-25): Embellishment, creative projects
6. Buttonhole Stitch (37): Automatic one-step buttonholes

Tip: Always test stitch on fabric scrap before starting your project.

Threading and Bobbin

Proper threading ensures smooth operation and quality stitches.

1. Upper Threading: Raise presser foot, place thread on spool pin, follow numbered path, use needle threader.
2. Bobbin Winding: Place empty bobbin on winder, disengage clutch, press foot controller to wind.
3. Bobbin Insertion: Open cover, drop in bobbin with thread unwinding counterclockwise, pull thread through slot.
4. Bring Up Bobbin Thread: Hold upper thread, turn hand wheel toward you until bobbin thread appears.
5. Thread Tension: Start with default setting (4), adjust based on fabric and thread type.

WARNING! Always raise needle to highest position before threading. Never force dials or controls.

Maintenance & Cleaning

Regular maintenance ensures optimal performance and longevity.

1. Daily: Remove lint from bobbin area and feed dogs with brush provided.
2. Weekly: Oil hook race and moving parts with sewing machine oil (2-3 drops).
3. Monthly: Clean tension discs with soft brush or unthreaded fabric strip.
4. Needle Replacement: Replace needle after 8-10 hours of sewing or for each new project.
5. Storage: Cover machine when not in use, store in dry area away from dust.

CAUTION! Unplug machine before cleaning or maintenance. Use only sewing machine oil.

Regulatory Information

UL Listed: Complies with UL safety standards. FCC Part 15: Class B digital device compliant. Copyright © 2023 Mercury Sewing Machines; all rights reserved. For technical support and service, visit www.mercurysewing.com or contact 1-800-555-1234. Made for household use only.

Troubleshooting

Service: 1-800-555-1234; www.mercurysewing.com