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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  |
Shift Rod 125
#59

Presser bar and shuttle assembly diagram

Shift rod

Part #125

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

Axle Key 162
#11

Zigzag guide assembly diagram

Axle key

Part #162

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

Sewing Machine Axle Screw 1722
#49

Zigzag guide assembly diagram

Sewing machine axle screw

Part #1722

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

Sewing Machine Set Screw 39
#47

Presser bar and shuttle assembly diagram

Sewing machine set screw

Part #39

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

Hinge Spring 8262
#6

Base assembly diagram

Hinge spring

Part #8262

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

Lamp Plate 2987
#40

Base assembly diagram

Lamp plate

Part #2987

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

Set Screw 1919
#45

Zigzag guide assembly diagram

Set screw

Part #1919

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

Guard Cord 2537
#13

Zigzag guide assembly diagram

Guard cord

Part #2537

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 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 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 does my sewing machine make a knocking sound?

Main causes: machine needs lubrication, internal gear failure…

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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 is my sewing machine running sluggishly?

Main causes: lack of lubrication, lint buildup, worn drive belt, faulty 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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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 turn on?

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

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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 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
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

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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