Homelite
Gas Walk-Behind Mower

Model # SB21 Official Homelite 21" lawn mower

Here are the diagrams and repair parts for Official Homelite SB21 21" lawn mower, as well as links to manuals and error code tables, if available.

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Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

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Model diagram and schematic

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Showing 10 of 150 parts  |

Blade JA-39016-2
#33

Figure 1 diagram

Blade

Part #JA-39016-2

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

Charger JA-33564-9

#NI

All parts diagram

Charger

Part #JA-33564-9

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

Tie JA-47316-8

#NI

All parts diagram

Tie

Part #JA-47316-8

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

Gasket JA-37594-8
#20

Figure 4 diagram

Gasket

Part #JA-37594-8

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

Housing JA-99060-5
#34

Figure 2 diagram

Housing

Part #JA-99060-5

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

Bolt JA-35910-2
#17

Figure 2 diagram

Bolt

Part #JA-35910-2

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

Cover JA-99128-4
#32

Figure 1 diagram

Cover

Part #JA-99128-4

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

Switch JA-99122-8
#35

Figure 2 diagram

Switch

Part #JA-99122-8

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

Screw JA-40970-4
#41

Figure 1 diagram

Screw

Part #JA-40970-4

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

Ring JA-45845-1
#53

Figure 1 diagram

Ring

Part #JA-45845-1

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

Symptoms for gas walk-behind mowers

Choose a symptom to see related walk-behind mower repairs.

Main causes: dirty carburetor, bad spark plug, clogged air filter, engine choke problems, clogged gas cap vent…

Main causes: stale gas, engine needs tune up, bad spark plug, dead battery, bad recoil starter, faulty safety switch, ba…

Main causes: uneven wheel height settings, damaged wheel, dull or damaged cutting blade…

Main causes: drive control cable failure, worn or broken drive belt, bad transmission, broken drive wheel…

Main causes: engine needs tune up, dirty or clogged carburetor, damaged flywheel key…

Main causes: damaged cutting blade, loose cutting blade, damaged flywheel key, engine needs tune up…

Repair guides for gas walk-behind mowers

These step-by-step repair guides will help you safely fix what’s broken on your walk-behind lawn mower.

How to rebuild a lawn mower carburetor

How to rebuild a lawn mower carburetor

The carburetor mixes air with fuel to drive the piston. Rebuild the carburetor if it's clogged or leaks.…

Repair difficulty
Time required
 60 minutes or less
How to replace a lawn mower recoil starter on an OHV engine

How to replace a lawn mower recoil starter on an OHV engine

Replace the recoil starter if it doesn't move when you pull the starter rope.…

Repair difficulty
Time required
 15 minutes or less
How to replace a lawn mower wheel

How to replace a lawn mower wheel

Learn how replace a damaged wheel on a walk-behind lawn mower—it's a quick, easy fix.…

Repair difficulty
Time required
 15 minutes or less

Effective articles & videos to help repair your walk-behind mowers

Use the advice and tips in these articles and videos to get the most out of your walk-behind lawn mower.

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.…

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.…

Types of walk-behind mower blades video

Types of walk-behind mower blades video

Learn about the different kinds of mower blades and how to maintain them.…