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Troybilt
Gas Walk-Behind Mower

Model # 420 Official Troybilt lawn mower

Here are the diagrams and repair parts for Official Troybilt 420 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.

Owner’s manual

Model diagram and schematic

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ALL PARTS
Showing 10 of 48 parts  |
Blade-21" Mu 742-0741
#23

Rotary mower diagram

Blade-21" mu

Part #742-0741

Replaced by #942-0741A

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Manufacturer substitution
This part replaces 742-0741. Substitute parts can look different from the original.
BEST SELLER

Get free shipping with Automatic Reorder

$29.10 | 
17% OFF Phone Price : $35.10
In Stock
Knob 720-04072
#9

Rotary mower diagram

Knob

Part #720-04072

Replaced by #720-04072A

?
Manufacturer substitution
This part replaces 720-04072. Substitute parts can look different from the original.
BEST SELLER
$9.33 | 
10% OFF Phone Price : $10.33
In Stock
Lawn Tractor Screw, 1/4-20 X 5/8-in (replaces 910-1652) 710-1652
#41

Rotary mower diagram

Lawn tractor screw, 1/4-20 x 5/8-in (replaces 910-1652)

Part #710-1652

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This item is not returnable
$5.44 | 
16% OFF Phone Price : $6.44
In Stock
Wing Nut 712-0397
#37

Rotary mower diagram

Wing nut

Part #712-0397

Replaced by #712-0397A

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Manufacturer substitution
This part replaces 712-0397. Substitute parts can look different from the original.
This item is not returnable
$5.22 | 
16% OFF Phone Price : $6.22
In Stock
Cable Tie 726-0240
#11

Rotary mower diagram

Cable tie

Part #726-0240

Replaced by #726-0178

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Manufacturer substitution
This part replaces 726-0240. Substitute parts can look different from the original.
This item is not returnable
$2.16
In Stock
Grsbg 21" 40 664-04011
#8

Rotary mower diagram

Grsbg 21" 40

Part #664-04011

Replaced by #964-04007A

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Manufacturer substitution
This part replaces 664-04011. Substitute parts can look different from the original.
$143.25 | 
8% OFF Phone Price : $155.25
In Stock
Bail 747-1161A
#1

Rotary mower diagram

Bail

Part #747-1161A

Replaced by #747-1161A-0637

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Manufacturer substitution
This part replaces 747-1161A. Substitute parts can look different from the original.
This item is not returnable
$20.10 | 
23% OFF Phone Price : $26.10
In Stock
Ace Lawn Tractor Hex Screw 710-0654A
#44

Rotary mower diagram

Ace lawn tractor hex screw

Part #710-0654A

This item is not returnable
$6.57 | 
13% OFF Phone Price : $7.57
In Stock
Lawn Mower Rear Skirt Wire Rod 732-0700
#36

Rotary mower diagram

Lawn mower rear skirt wire rod

Part #732-0700

Replaced by #732P0700

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Manufacturer substitution
This part replaces 732-0700. Substitute parts can look different from the original.
$7.63
In Stock
Upper Handle 749-1092A
#2

Rotary mower diagram

Upper handle

Part #749-1092A

Replaced by #749-1092A-0637

?
Manufacturer substitution
This part replaces 749-1092A. Substitute parts can look different from the original.
$63.25 | 
9% OFF Phone Price : $69.25
In Stock

Symptoms for gas walk-behind mowers

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

View all

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…

Read more

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…

Read more

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…

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

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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Top questions about Sears and Sears PartsDirect

Get answers to frequently asked questions about Sears and Sears PartsDirect.…

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