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Snapper
Gas Walk-Behind Mower

Model # 7800003 (S21) Official Snapper lawn mower

Here are the diagrams and repair parts for Official Snapper 7800003-S21 lawn mower, as well as links to manuals and error code tables, if available.

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  • In the search box below, enter all or part of the part number or the part’s name.

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

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For DIY troubleshooting advice and repair guides, visit our repair help section.

Model diagram and schematic

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Showing 10 of 163 parts  |
Hln, 1/4c Bz 7076978
Hln, 1/4c bz

Part #7076978

Replaced by #703232

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Manufacturer substitution
This part replaces 7076978. Substitute parts can look different from the original.
BEST SELLER
This item is not returnable
$6.24 | 
14% OFF Phone Price : $7.24
In Stock
Retaining Ring 7014341
#3

Rear wheels (self-propelled) diagram

Retaining ring

Part #7014341

Replaced by #703976

?
Manufacturer substitution
This part replaces 7014341. Substitute parts can look different from the original.
This item is not returnable
$7.09 | 
12% OFF Phone Price : $8.09
In Stock
Hfln 3/8 7091619
#8

Rear deck brackets/idler arm diagram

Hfln 3/8

Part #7091619

Replaced by #703333

?
Manufacturer substitution
This part replaces 7091619. Substitute parts can look different from the original.
This item is not returnable
$8.09 | 
11% OFF Phone Price : $9.09
In Stock
Fw, .406x1.5 7091331
#9

Rear deck brackets/idler arm diagram

Fw, .406x1.5

Part #7091331

Replaced by #703591

?
Manufacturer substitution
This part replaces 7091331. Substitute parts can look different from the original.
$9.57
In Stock
Lawn & Garden Equipment Nut 7091135
Lawn & garden equipment nut

Part #7091135

Replaced by #703948

?
Manufacturer substitution
This part replaces 7091135. Substitute parts can look different from the original.
This item is not returnable
$7.29 | 
12% OFF Phone Price : $8.29
In Stock
Belt Guide 7100022
#4

Engine/blade diagram

Belt guide

Part #7100022

Replaced by #7100022YP

?
Manufacturer substitution
This part replaces 7100022. Substitute parts can look different from the original.
$9.40
In Stock
Pawl, 3/16" O.d. 7024749
#30

Rear wheels (self-propelled) diagram

Pawl, 3/16" o.d.

Part #7024749

Replaced by #7024749YP

?
Manufacturer substitution
This part replaces 7024749. Substitute parts can look different from the original.
$27.24
In Stock
Wiring Harness 7100327
#30

Handles/controls diagram

Wiring harness

Part #7100327

Replaced by #7100327YP

?
Manufacturer substitution
This part replaces 7100327. Substitute parts can look different from the original.
$73.84
In Stock
Axle Arm Assembly 7078236
Axle arm assembly

Part #7078236

Replaced by #7078236YP

?
Manufacturer substitution
This part replaces 7078236. Substitute parts can look different from the original.
$93.78
In Stock
Head Control 7100254
#8B

Handles/controls diagram

Head control

Part #7100254

Replaced by #7100254YP

?
Manufacturer substitution
This part replaces 7100254. Substitute parts can look different from the original.
$79.89
In Stock

Symptoms for gas walk-behind mowers

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

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Why does my lawn mower run rough?

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

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Why does my lawn mower cut unevenly?

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

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Why does my lawn mower vibrate a lot?

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

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Why won't my lawn mower start?

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

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Why does my lawn mower stall?

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

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Why won't my lawn mower move?

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

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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.

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How to replace a lawn mower spark plug

How to replace a lawn mower spark plug

Take a few minutes to replace the spark plug during your lawn mower's annual tune-up or if the spark plug is burnt or cr…

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

How to replace a lawn mower blade

Check your lawn mower blade regularly and replaced it if it's bent or damaged. …

Read more
Repair difficulty
Time required
 15 minutes or less
How to replace a lawn mower flywheel key on a flathead engine

How to replace a lawn mower flywheel key on a flathead engine

When you hit a hard object with your mower, the flywheel can shear to protect more expensive components. Learn how to re…

Read more
Repair difficulty
Time required
 45 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.

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Tapping into a new feature in the Search Bar on Sears PartsDirect

Learn about a new feature added to the Search Bar on Sears PartsDirect…

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Introducing new technical repair content that we’re developing for the Sears Technical Institute

Learn about Sears Technical Institute and the advanced technical content being developed for aspiring appliance techs.…

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