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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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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.
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This item is not returnable
$6.24 | 
14% OFF Phone Price : $7.24
In Stock
Fln 5/16-18 7091601
Fln 5/16-18

Part #7091601

Replaced by #703409

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Manufacturer substitution
This part replaces 7091601. Substitute parts can look different from the original.
$9.27 | 
10% OFF Phone Price : $10.27
In Stock
Nut 7091070
Nut

Part #7091070

Replaced by #703409

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Manufacturer substitution
This part replaces 7091070. Substitute parts can look different from the original.
$9.27 | 
10% OFF Phone Price : $10.27
In Stock
Hfln 3/8 7091619
#8

Rear deck brackets/idler arm diagram

Hfln 3/8

Part #7091619

Replaced by #703333

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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
Blade 7100242
#10

Engine/blade diagram

Blade

Part #7100242

Replaced by #7100242AYP

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Manufacturer substitution
This part replaces 7100242. Substitute parts can look different from the original.

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$36.69 | 
14% OFF Phone Price : $42.69
In Stock
Ball Bearing 7078243
#33

Rear wheels (self-propelled) diagram

Ball bearing

Part #7078243

Replaced by #7078243YP

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Manufacturer substitution
This part replaces 7078243. Substitute parts can look different from the original.
$19.09
In Stock
Lawn Mower Grass Bag 7075765
#2

Bagging diagram

Lawn mower grass bag

Part #7075765

Replaced by #7075765YP

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Manufacturer substitution
This part replaces 7075765. Substitute parts can look different from the original.
$164.29 | 
7% OFF Phone Price : $176.29
In Stock
Wheel & Pm B 7100184
#1A

Rear wheels (self-propelled) diagram

Wheel & pm b

Part #7100184

Replaced by #7104781YP

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Manufacturer substitution
This part replaces 7100184. Substitute parts can look different from the original.
$57.29
In Stock
Fw, .39x.72x 7012316
#4

Transmission diagram

Fw, .39x.72x

Part #7012316

Replaced by #703946

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Manufacturer substitution
This part replaces 7012316. Substitute parts can look different from the original.
This item is not returnable
$6.94
In Stock
Height Latch 7012325
#14

Front wheels diagram

Height latch

Part #7012325

Replaced by #7012325YP

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Manufacturer substitution
This part replaces 7012325. Substitute parts can look different from the original.
$10.71
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…

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Repair difficulty
Time required
 45 minutes or less

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

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

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