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MTD
Gas Walk-Behind Mower

Model # 440 Official MTD gas lawn mower

Here are the diagrams and repair parts for Official MTD 440 gas 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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Showing 10 of 130 parts  |
Blade-21" Mu 742-0741
#46

Self starter rear-discharge 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.
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$29.10 | 
17% OFF Phone Price : $35.10
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Cable Tie 726-0240
#26

Self starter rear-discharge 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
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Aircap Lawn & Garden Equipment Hex Screw 710-0896
#59

Self starter rear-discharge mower diagram

Aircap lawn & garden equipment hex screw

Part #710-0896

This item is not returnable
$5.22 | 
16% OFF Phone Price : $6.22
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Lawn Tractor Hex Nut 712-0271
#30

Self starter rear-discharge mower diagram

Lawn tractor hex nut

Part #712-0271

This item is not returnable
$6.66 | 
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In Stock
Yard-man Lawn & Garden Equipment Hex Screw 710-1256
#15

Self starter rear-discharge mower diagram

Yard-man lawn & garden equipment hex screw

Part #710-1256

This item is not returnable
$10.37
In Stock
Lawn Mower Drive Pinion Gear 717-1762
#44

Wheels/tires diagram

Lawn mower drive pinion gear

Part #717-1762

This item is not returnable
$21.24 | 
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Lawn & Garden Equipment Screw 710-0606
#48

Self starter rear-discharge mower diagram

Lawn & garden equipment screw

Part #710-0606

This item is not returnable
$8.21 | 
11% OFF Phone Price : $9.21
In Stock
Oil Seal 721-0329
#19

Wheels/tires diagram

Oil seal

Part #721-0329

Replaced by #921-0329

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Manufacturer substitution
This part replaces 721-0329. Substitute parts can look different from the original.
$17.66
In Stock
Screw #12x. 7510042824
#40

Self starter rear-discharge mower diagram

Screw #12x.

Part #7510042824

Replaced by #710-1650

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Manufacturer substitution
This part replaces 7510042824. Substitute parts can look different from the original.
This item is not returnable
$5.95 | 
14% OFF Phone Price : $6.95
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Dust Cover Wheel 782-7551
#43

Wheels/tires diagram

Dust cover wheel

Part #782-7551

Replaced by #782-7551A

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Manufacturer substitution
This part replaces 782-7551. Substitute parts can look different from the original.
This item is not returnable
$6.76 | 
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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…

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

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