Kenmore 1230 / 1240 / 1250 Sewing Machine Service Manual (P/N 52917)

• Official OEM publication Part No. 52917
• 47-page technical guide covering the Kenmore 1230, 1240, and 1250 Zig-Zag sewing machine models
• 17 illustrated parts diagrams for precise component identification
• Detailed troubleshooting matrix targeting common performance issues

Operational and Maintenance Coverage

Understanding the mechanics of these Kenmore models starts with their unique control setups. This manual breaks down major component configurations, including top thread tension calibration and precise stitch width adjustments. Working on a 1240 or 1250 variant? You will find specific details outlining the Special Stitch Variegator. The text maps out accurate thread paths and bobbin installation procedures, highlighting the critical balance required between top and bottom tension when switching fabric weights.

Beyond basic garment construction techniques like straight stitching, zigzag applications, and blind hemming, the guide covers stretch-fabric management. For long-term shop maintenance, the document details shuttle assembly care. This includes exact cleaning protocols and essential lubrication points to keep the machine running smoothly on the bench.

Specification and Performance Data

Tuning these machines for specific projects requires accurate baseline data. Inside, a comprehensive needle, thread, and fabric chart helps you match hardware directly to the material type. Standard applications typically call for 10 to 12 stitches per inch. The guide lists these common settings alongside width control parameters for buttonholing and mending.

If you run into skipped stitches or irregular fabric movement, the troubleshooting table steps through corrective actions like needle size selection and tension tweaks. Keep in mind that servicing sewing machine internals involves moving mechanical parts. Always disconnect the power supply before adjusting mechanical timings, and rely on this original OEM documentation to guide your hands-on work safely.