Kenmore 158 Sewing Machine Repair Manual

The Kenmore 158 sewing machine is a versatile household sewing machine known for its durability and reliability. This repair manual covers essential maintenance, troubleshooting, and repair procedures for various models in the 158 series. Below are key sections covering safety precautions, machine overview, common issues, repair procedures, maintenance schedules, and parts identification.

Machine Overview

Key components: Bobbin case, Needle bar, Presser foot, Tension discs, Stitch length selector, Reverse stitch button, Thread take-up lever, Hand wheel.

Safety Precautions

Always unplug machine before performing any repairs or maintenance.

1. Disconnect power: Unplug from electrical outlet before servicing.
2. Needle safety: Always point needle away from body when handling.
3. Electrical safety: Check power cord for damage before use.
4. Work area: Ensure clean, well-lit workspace free from obstructions.

WARNING! Never operate machine with protective covers removed. Keep fingers away from moving parts during operation.

Basic Operation

Proper setup ensures optimal performance and prevents damage.

1. Threading: Follow numbered guides precisely for upper and bobbin threading.
2. Needle installation: Flat side faces back; tighten securely.
3. Tension adjustment: Test on scrap fabric; adjust until balanced.
4. Stitch selection: Choose appropriate stitch for fabric type.

CAUTION! Always use correct needle type and size for fabric. Replace bent or dull needles immediately.

Specifications

• Model Series: Kenmore 158
• Stitch Types: Straight, zigzag, decorative stitches
• Stitch Length: 0-4mm adjustable
• Stitch Width: 0-5mm adjustable
• Bobbin Type: Class 15 vertical oscillating
• Needle System: 15x1 (HAx1)
• Power Requirements: 120V AC, 60Hz
• Motor Type: Standard household sewing motor
• Weight: Approximately 15-20 lbs

Tools Required

Essential tools for Kenmore 158 repairs and maintenance.

Basic Toolkit: Screwdrivers (flat and Phillips), Needle nose pliers, Tweezers, Small brush, Lint roller, Sewing machine oil, Lubrication syringe.

Specialized: Bobbin case wrench, Timing light, Gear puller (for advanced repairs). Diagnostic: Multimeter for electrical testing, Strobe light for timing verification.

Common Problems & Solutions

Thread breaking, Skipped stitches, Uneven feeding, Machine jams.

1. Check needle: Replace if bent, dull, or incorrect type.
2. Inspect threading: Re-thread completely following guide.
3. Clean machine: Remove lint and thread fragments.
4. Adjust tension: Test on scrap fabric until balanced.

Tip: Always start with simplest solutions before disassembling machine.

Maintenance Procedures

Regular maintenance prevents most common issues.

1. Daily: Brush out lint from bobbin area and feed dogs.
2. Weekly: Oil moving parts according to lubrication chart.
3. Monthly: Clean tension discs with folded fabric strip.
4. Annually: Complete disassembly for thorough cleaning and inspection.
5. Electrical: Check power cord and foot controller for wear.
6. Mechanical: Inspect gears and belts for wear or damage.

WARNING! Use only sewing machine oil. Never use household oils which can damage mechanisms.

Parts Replacement

Common replacement parts and installation procedures.

Needles: Insert with flat side to rear; tighten thumb screw firmly. Bobbin case: Ensure tension spring is clean and functional. Belts: Check for cracking or stretching; replace if worn. Brushes: Replace motor brushes when worn to 1/4 inch. Gears: Inspect for broken teeth; replace complete gear set if damaged.

Lubrication Guide

Oil points: Needle bar, Hook race, Take-up lever, Bobbin case area.

Frequency: Light machines use - every 8 hours; Heavy use - every 4 hours.

Troubleshooting Chart

Reset: Unplug for 5 minutes to reset electronic components if applicable.

Service: For complex repairs, contact authorized Kenmore service center.