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Kenmore
Mechanical Sewing Machine

Model # 158840 Official Kenmore sewing machine

Here are the diagrams and repair parts for Official Kenmore 158840 sewing machine, as well as links to manuals and error code tables, if available.

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Owner’s manual
Error Codes

Model diagram and schematic

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ALL PARTS
Showing 10 of 251 parts  |
Rod 2938
#48

Presser bar and shuttle assembly diagram

Rod

Part #2938

The manufacturer no longer makes this part, and there's no substitute part

Spring 2924
#31

Bobbin winder and tension assembly diagram

Spring

Part #2924

The manufacturer no longer makes this part, and there's no substitute part

Cam 2923
#27

Bobbin winder and tension assembly diagram

Cam

Part #2923

The manufacturer no longer makes this part, and there's no substitute part

Spring 8384
#50

Zigzag guide assembly diagram

Spring

Part #8384

The manufacturer no longer makes this part, and there's no substitute part

Spring 11230
#24

Base assembly diagram

Spring

Part #11230

The manufacturer no longer makes this part, and there's no substitute part

Bushing 3
#30

Presser bar and shuttle assembly diagram

Bushing

Part #3

The manufacturer no longer makes this part, and there's no substitute part

Spacer 8138
#51

Zigzag guide assembly diagram

Spacer

Part #8138

The manufacturer no longer makes this part, and there's no substitute part

Stud 8149
#4

Zigzag guide assembly diagram

Stud

Part #8149

The manufacturer no longer makes this part, and there's no substitute part

Lever 2918
#47

Zigzag guide assembly diagram

Lever

Part #2918

The manufacturer no longer makes this part, and there's no substitute part

Stopper 4862
#29

Zigzag guide assembly diagram

Stopper

Part #4862

The manufacturer no longer makes this part, and there's no substitute part

Most common symptoms to help you fix your sewing machines

Choose a symptom to see related sewing machine repairs.

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Why is my sewing machine skipping stitches?

Main causes: dirty shuttle race, wrong thread tension, bad needle timing, damaged needle, using the wrong type of needle…

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Why does my sewing machine lock up?

Main causes: thread bunched up in the shuttle race, bad needle timing, internal drive gear failures…

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Why won't fabric move through my sewing machine?

Main causes: problems with the feed dogs, setting stitch length to 0…

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Why does my sewing machine make a knocking sound?

Main causes: machine needs lubrication, internal gear failure…

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Why is my sewing machine running sluggishly?

Main causes: lack of lubrication, lint buildup, worn drive belt, faulty drive motor…

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Why does the bobbin thread break in my sewing machine?

Main causes: dirty shuttle race, improper thread routing, incorrect thread tension…

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Why won't my sewing machine turn on?

Main causes: power supply failure, bad power cord, faulty On/Off switch…

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Why doesn't my sewing machine motor run?

Main causes: faulty foot pedal, locked drive gears, wiring failure, bad drive motor…

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Why won't my sewing machine needle move?

Main causes: disengaged clutch, broken drive belt, internal drive gear failure…

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Most common repair guides to help fix your sewing machines

These step-by-step repair guides will help you safely fix what’s broken on your sewing machine.

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How to replace a sewing machine on/off switch

How to replace a sewing machine on/off switch

If the sewing machine is completely dead, replace the On/Off switch using these 6 steps.…

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Repair difficulty
Time required
 30 minutes or less
How to replace a sewing machine drive motor

How to replace a sewing machine drive motor

If the drive motor on your sewing machine runs roughly or doesn't run at all, you can replace it in about 30 minutes usi…

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Repair difficulty
Time required
 15 minutes or less
How to replace a sewing machine drive belt

How to replace a sewing machine drive belt

You can replace a broken sewing machine drive belt in about 15 minutes. …

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Repair difficulty
Time required
 15 minutes or less

Effective articles & videos to help repair your sewing machines

Use the advice and tips in these articles and videos to get the most out of your sewing machine.

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How to enjoy all the online benefits we offer on our Sears PartsDirect website

How to enjoy all the online benefits we offer on our Sears PartsDirect website

Learn about all the convenient features on our Sears PartsDirect website that make your parts purchases easier.…

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Top questions about Sears and Sears PartsDirect

Top questions about Sears and Sears PartsDirect

Get answers to frequently asked questions about Sears and Sears PartsDirect.…

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How to use a multimeter to test electrical parts video

How to use a multimeter to test electrical parts video

Learn how to use a multimeter to check for wiring problems in an appliance that's not working…

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