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Snapper
Rear-Engine Riding Mower

Model # M300921B Official Snapper rear-engine riding lawn mower

Here are the diagrams and repair parts for Official Snapper M300921B rear-engine riding 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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For DIY troubleshooting advice and repair guides, visit our repair help section.

Owner’s manual

Model diagram and schematic

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ALL PARTS
Showing 10 of 462 parts  |
Filter 1-4359
#5

Fuel tank & operation seat diagram

Filter

Part #1-4359

Replaced by #394358S

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Manufacturer substitution
This part replaces 1-4359. Substitute parts can look different from the original.
BEST SELLER
$6.67 | 
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In Stock
Clamp 1-2222
#6

Fuel tank & operation seat diagram

Clamp

Part #1-2222

Replaced by #791850

?
Manufacturer substitution
This part replaces 1-2222. Substitute parts can look different from the original.
This item is not returnable
$4.74 | 
17% OFF Phone Price : $5.74
In Stock
Screw, #8-18 X 1/2" (42" Deck Only) (4) 9-1581
#2

Exhaust muffler & engines diagram

Screw, #8-18 x 1/2" (42" deck only) (4)

Part #9-1581

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

Hub, Driven Disc 5-4243
#2

Smooth clutch diagram

Hub, driven disc

Part #5-4243

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

Switch, (recoil Start) 1-1853
#10

Electrical system (recoil start) diagram

Switch, (recoil start)

Part #1-1853

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

Solenoid 1-8817
#2

Electrical system (electric start) diagram

Solenoid

Part #1-8817

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

Spring Shift Handle 1-0754
#16

Main case diagram

Spring shift handle

Part #1-0754

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

Decal, Abs Pedal 2-4072
#32

Decals diagram

Decal, abs pedal

Part #2-4072

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

Lawn Sweeper (36") 6-1913

#NI24

All parts diagram

Lawn sweeper (36")

Part #6-1913

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

Anchor 3-2243
#34

Belts, brakes, interlock diagram

Anchor

Part #3-2243

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

Most common symptoms to help you fix your riding mowers & tractors

Choose a symptom to see related riding mower and lawn tractor repairs.

View all

Why won't my riding mower cut grass?

Main causes: worn or broken blade belt, broken belt idler pulley, blade clutch cable failure, bad PTO switch, damaged ma…

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How do I charge a dead battery on my riding mower?

Main causes: faulty battery, bad alternator…

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How do I fix a flat tire on my riding mower?

Main causes: punctured tire or inner tube, leaky valve stem, damaged wheel rim…

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Why won't my riding mower start?

Main causes: dead battery, stale fuel, bad starter solenoid, ignition system problem, bad ignition interlock switch, clo…

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Why is the steering loose on my riding mower?

Main causes: damaged tie rods, bent or worn wheel spindle, worn front axle, damaged sector gear assembly…

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Why does my riding mower creep in neutral?

Main causes: shift lever needs adjustment, neutral control needs adjustment…

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Why does my riding mower run rough or misfire?

Main causes: clogged carburetor, damaged flywheel key, dirty spark plug, stale fuel, improper valve lash, engine needs a…

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Why won't my riding mower move?

Main causes: worn or broken ground drive belt, bad seat switch, transaxle freewheel control engaged, transaxle failure, …

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Why is my riding mower not cutting evenly?

Main causes: unlevel mower deck, dull or damaged cutting blades, worn mandrel pulleys, bent mower deck, engine needs tun…

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Most common repair guides to help fix your riding mowers & tractors

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

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How to replace a mandrel assembly on a riding lawn mower

How to replace a mandrel assembly on a riding lawn mower

Replace the mandrel assembly if the blade shaft vibrates or doesn't spin.…

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Repair difficulty
Time required
 30 minutes or less
How to replace the flywheel key on a riding lawn mower

How to replace the flywheel key on a riding lawn mower

If the engine won't restart after hitting a stump or rock, the problem could be a sheared flywheel key. Follow these ste…

Read more
Repair difficulty
Time required
 60 minutes or less
How to replace a riding lawn mower ignition coil

How to replace a riding lawn mower ignition coil

If you're not getting spark from a good spark plug, the problem could be the ignition coil. Follow these step-by-step in…

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Repair difficulty
Time required
 30 minutes or less

Effective articles & videos to help repair your riding mowers & tractors

Use the advice and tips in these articles and videos to get the most out of your riding mower or lawn tractor.

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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 remove a lawn mower blade using a removal tool

How to remove a lawn mower blade using a removal tool

Learn how a blade removal tool makes replacing the blade easier and safer…

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Riding lawn mower engine clicks but doesn't turn over video

Riding lawn mower engine clicks but doesn't turn over video

Check the starter solenoid, starter motor, wiring, battery and engine.…

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