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

• Official OEM publication Part No. 52917 in convenient PDF format
• 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
• Feed dog control, presser foot pressure regulator, bobbin winder mechanism, shuttle race assembly, take-up lever
• Buttonhole configurations, zipper applications, satin stitching, monogramming, reverse stitch control, darning techniques, appliqueing

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. To save you an expensive trip to the repair shop, the guide provides step-by-step instructions for clearing stubborn thread jams in the shuttle area, adjusting the bobbin case tension for stretch knits, and executing complete top-to-bottom lubrication.

Beyond basic garment construction techniques like straight stitching, zigzag applications, and blind hemming, the document details stretch-fabric management. It includes needle threading schematics, tension adjustment diagrams, and shuttle assembly exploded views to eliminate guesswork on the bench. A frequent pitfall when restoring these specific Kenmore models involves the Special Stitch Variegator and stitch width controls; forcing these dials while the needle is lowered into the fabric easily bends the delicate internal tracking linkages. Furthermore, the drop feed mechanism often seizes due to decades-old, solidified oil, requiring careful disassembly rather than excessive force on the lever.

Specification and Performance Data

Tuning these machines for specific projects requires accurate baseline data. Inside, a precise 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 or accessing the underside oiling points, and rely on this original OEM documentation to guide your hands-on work safely.