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Craftsman
Front-Engine Lawn Tractor

Model # 502813780 Official Craftsman 30" riding lawn mower

Here are the diagrams and repair parts for Official Craftsman 502813780 30" riding 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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ALL PARTS
Showing 10 of 260 parts  |
Battery 21075
#6

Wiring diagram diagram

Battery

Part #21075

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

Housing 20551
#328

Blade housing diagram

Housing

Part #20551

Replaced by #492574MA

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Manufacturer substitution
This part replaces 20551. Substitute parts can look different from the original.
$68.99 | 
8% OFF Phone Price : $74.99
In Stock
Bolt 1X20
#47

Lower half diagram

Bolt

Part #1X20

Replaced by #1X20MA

?
Manufacturer substitution
This part replaces 1X20. Substitute parts can look different from the original.
$7.57
In Stock
Hex Bolt 1X38
#10

Wiring diagram diagram

Hex bolt

Part #1X38

Replaced by #1X38MA

?
Manufacturer substitution
This part replaces 1X38. Substitute parts can look different from the original.
$7.57
In Stock
Fuse Holder 407058
#5A

Wiring diagram diagram

Fuse holder

Part #407058

Replaced by #407078MA

?
Manufacturer substitution
This part replaces 407058. Substitute parts can look different from the original.
$29.53 | 
17% OFF Phone Price : $35.53
In Stock
Belt Guide 20619
#330

Blade housing diagram

Belt guide

Part #20619

Replaced by #20619MA

?
Manufacturer substitution
This part replaces 20619. Substitute parts can look different from the original.
$7.77
In Stock
Cotter Pin 30X20
#41

Top half diagram

Cotter pin

Part #30X20

Replaced by #703312

?
Manufacturer substitution
This part replaces 30X20. Substitute parts can look different from the original.
This item is not returnable
$7.14
In Stock
Lock Nut 15X84
#33

Top half diagram

Lock nut

Part #15X84

Replaced by #703893

?
Manufacturer substitution
This part replaces 15X84. Substitute parts can look different from the original.
This item is not returnable
$11.29 | 
15% OFF Phone Price : $13.29
In Stock
Steer Post 20864
#17

Lower half diagram

Steer post

Part #20864

Replaced by #11X16MA

?
Manufacturer substitution
This part replaces 20864. Substitute parts can look different from the original.
This item is not returnable
$6.91
In Stock
Washer 400040
#23H

Transmission diagram

Washer

Part #400040

Replaced by #583728901

?
Manufacturer substitution
This part replaces 400040. Substitute parts can look different from the original.
This item is not returnable
$6.83
In Stock

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

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

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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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Why does my riding mower deck vibrate?

Main causes: damaged cutting blade, worn deck pulley, damaged mandrel pulley, loose fasteners on mower deck components…

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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 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…

Read more

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 is my riding mower leaking oil or gas?

Main causes: engine overfilled with oil, leaky head gasket or sump gasket, damaged carburetor seals, cracked fuel pump, …

Read more

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 does my riding mower creep in neutral?

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

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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, …

Read more

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 the starter motor on a riding lawn mower

How to replace the starter motor on a riding lawn mower

If you hear the solenoid click but don’t hear the starter motor spin when you turn the key, follow these steps to replac…

Read more
Repair difficulty
Time required
 30 minutes or less
How to rebuild a riding lawn mower carburetor

How to rebuild a riding lawn mower carburetor

Get your sputtering carburetor running smoothly in 60 minutes.…

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

How to replace a riding lawn mower rear tire

Your mower can’t run on a damaged rear tire. Here’s how to install a new one.…

Read more
Repair difficulty
Time required
 60 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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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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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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