Brother 634D User Manual

Identifies and describes the main components of the overlock sewing machine.

Lists and illustrates the various accessories that come with the sewing machine.

Covers the procedures for removing and fitting the sewing machine needle.

Details on motor turning direction and how to open/close the front cover.

Guide for replacing the sewing machine's light bulb.

Steps to prepare the machine for operation and control its speed.

Information on motor operation and critical safety warnings.

Guidance on using the spool cap and net for proper thread handling.

Step-by-step instructions for threading the overlooper component.

Detailed steps for threading the underlooper part of the machine.

Instructions for threading the right needle of the sewing machine.

Procedure for threading the left needle on the M546/M546D models.

How to perform test sewing and chain off threads after threading.

Chart correlating materials, threads, needles, and stitch pitch.

Covers tension control dials and steps for adjusting thread tension.

Visual guide showing how thread tension issues manifest.

Instructions for adjusting the differential feed mechanism.

How to adjust the stitch length or pitch on the sewing machine.

Explains differential feed ratio, its effects, and applications.

Covers starting sewing, removing work, handling thread breaks, and safety warnings.

How to adjust the presser foot pressure for different fabric types.

A chart indicating common troubles, their causes, and remedies.

Descriptions of the different types of stitches the machine can form.

Instructions for attaching and using the rolled hemming stitch accessory.

Guidance on adjusting sewing pitch and changing threads for hemming.

How to adjust the bight size for rolled hemming and regular stitches.

Step-by-step instructions for replacing the upper and lower blades.

Procedures and recommendations for periodically oiling the machine.

Technical details and specifications of the sewing machine model.