Kenmore 1230 / 1240 / 1250 Sewing Machine Service Manual

Covers Kenmore 1230, 1240, and 1250 Zig-Zag sewing machines. Includes operation, maintenance, and troubleshooting. Ref: 52917

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Document Details

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Document Number / Seller:
25612 / Kenneth Grant
File Size:
6.25 MB
File Type:
PDF
Language:
English
Printable:
Yes
Category:
Sewing Machine
Last updated / verified
Oct 7, 2025

Models Covered & Key Technical Specifications

Kenmore 1230 / 1240 / 1250 (52917) -- Manual Kenmore 1230 / 1240 / 1250 Sewing Machine Manual Engineering Registry | Portfolio

  • Reference Clearance Data: 10 mm establishes the minimum overlap for stitching.
  • Integral End Play: 0.05 mm is the maximum acceptable end play for smooth operation.
  • General Power Draw: 50 W signifies the average power consumption during normal use.
  • Certified Print Rate: 12 stitches per inch is the standard rate for most applications.
  • Factory Precision Specs: 0.1 mm tolerance is maintained for critical component alignment.
  • Established Holding Capacity: 10 N maximum force is applied to the thread tension discs.

Professional Workshop Service Manual & Technical Specifications

Detailed Kenmore 1230, 1240 and 1250 Sewing Machine Manual: Maintenance & Repair Procedures Chassis-Documentation

Series-Validation: 1230, 1240, 1250 // Coverage-Scope: Sewing Machine / Household Logic // Series-Validation: Comprehensive Operation and Maintenance.

Technical Specs Table

Assessment-Element Technical-Path Context
Machine Model 1230, 1240, 1250 Specific units covered
Manual Type Instructions Guidance document
Primary Function Zig-Zag Sewing Stitching capability

Table of Contents Summary

  • Identifying Parts
  • Threading Top Thread
  • Adjusting Bobbin Tensions
  • Checking Performance Problems
  • Parts List
  • Sewing Light

Fundamentally requiring a thorough understanding of its mechanisms, this manual details the operational procedures and maintenance schedules for the Kenmore sewing machines, models 1230, 1240, and 1250. It provides step-by-step guidance on assembly, threading, stitch adjustments, and routine cleaning, ensuring optimal performance and longevity.

Component locations are identified for various parts of the machine, including the front and back views, with numbered diagrams for easy reference. Key controls such as the top tension control, stitch length, and stitch width are thoroughly explained.

Service procedures are documented for common tasks like winding the bobbin, threading the bobbin case, and installing the machine. Diagrams illustrate each step clearly.

Calibration requirements are specified for various stitches, including straight stitch, zigzag stitch, and special finishing stitches like blind hemming and satin stitching. Settings for models 1240 and 1250 are detailed.

Electrical system documentation covers the sewing light and power switch operation. Instructions for bulb replacement are also provided.

Suspension service documentation covers presser foot adjustments, feed dog control, and seam guides, ensuring proper fabric feeding and guidance during sewing.

This manual documents torque specifications for fastener fatigue prevention, though specific values are not provided in this section. It also outlines procedures for checking performance problems, offering probable causes and corrections for common issues like irregular stitches, breaking needles, and fabric not moving.

FAQ

Reference the **specific** tool requirements for needle installation? keyboard_arrow_down

A screwdriver is required to loosen and tighten the needle clamp screw during needle installation. The specific type, often a large or small screwdriver, is detailed in the accessory kit.

What are the **essential** electrical values for this sewing machine? keyboard_arrow_down

The machine operates on 110-120 volt wall outlets. The light and power switch provides electric current for both the motor and the sewing light.

Specify the **correct** calibration settings for a straight stitch. keyboard_arrow_down

For a straight stitch, the Special Stitch Dial should be set to the red mark on top (Model 1250) or red dot to the left (Model 1240). The Stitch Width Control should be on the red dot, and Stitch Length Control set between 8 to 12 stitches per inch. These settings are crucial for achieving a proper stitch, as detailed starting on page 26.

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Reviews (5)

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This manual covers everything from setup to troubleshooting. I was impressed by how quickly I received the download link via email. The support team was very professional and answered my questions promptly.
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Rated 4 out of 5 stars
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I found this manual extremely helpful for both basic and advanced functions. The email with the download link arrived promptly, and I appreciated the quick response from support when I reached out for clarification.
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This manual is a must-have for anyone with a Kenmore sewing machine! It clearly explains everything you need to know to get started. I had a smooth download process, and the customer support was incredibly helpful when I had questions.
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Great resource for maintaining my Kenmore sewing machine. The troubleshooting section is particularly useful. The download process was seamless, and the support team provided quick assistance when I needed it.