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MTD
Gas Walk-Behind Mower

Model # 37278 Official MTD lawn mower

Here are the diagrams and repair parts for Official MTD 37278 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 78 parts  |
Yard Machines Lawn & Garden Equipment Bell Washer (replaces 936-0242) 736-0242
Yard machines lawn & garden equipment bell washer (replaces 936-0242)

Part #736-0242

This item is not returnable
$6.58 | 
13% OFF Phone Price : $7.58
In Stock
Lock Washer 736-0119
Lock washer

Part #736-0119

Replaced by #936-0119

?
Manufacturer substitution
This part replaces 736-0119. Substitute parts can look different from the original.
This item is not returnable
$6.05 | 
14% OFF Phone Price : $7.05
In Stock
Ryobi Lawn & Garden Equipment Flat Washer 736-0204
Ryobi lawn & garden equipment flat washer

Part #736-0204

This item is not returnable
$5.43 | 
16% OFF Phone Price : $6.43
In Stock
Sears Lawn & Garden Equipment Nut 712-0711
Sears lawn & garden equipment nut

Part #712-0711

This item is not returnable
$6.17
In Stock
Ace Lawn Tractor Hex Screw 710-0654A
Ace lawn tractor hex screw

Part #710-0654A

This item is not returnable
$6.57 | 
13% OFF Phone Price : $7.57
In Stock
Unknown Brand Name #689 Lawn & Garden Equipment Nut 712-0241
Unknown brand name #689 lawn & garden equipment nut

Part #712-0241

This item is not returnable
$7.63
In Stock
Yard-man Lawn & Garden Equipment Hex Screw 710-1256
Yard-man lawn & garden equipment hex screw

Part #710-1256

This item is not returnable
$10.37
In Stock
Throttle Wire 746-0674
Throttle wire

Part #746-0674

Replaced by #946-0674A

?
Manufacturer substitution
This part replaces 746-0674. Substitute parts can look different from the original.
$27.09
In Stock
Lawn Mower Blade 742-0721
Lawn mower blade

Part #742-0721

Replaced by #942-0721

?
Manufacturer substitution
This part replaces 742-0721. Substitute parts can look different from the original.

Get free shipping with Automatic Reorder

$36.79 | 
14% OFF Phone Price : $42.79
In Stock
Lawn & Garden Equipment Screw 710-1237
Lawn & garden equipment screw

Part #710-1237

$7.71
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 vibrate a lot?

Main causes: damaged cutting blade, loose cutting blade, damaged flywheel key, engine needs tune up…

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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 run rough?

Main causes: engine needs tune up, dirty or clogged carburetor, damaged flywheel key…

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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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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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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 rebuild a lawn mower carburetor

How to rebuild a lawn mower carburetor

The carburetor mixes air with fuel to drive the piston. Rebuild the carburetor if it's clogged or leaks.…

Read more
Repair difficulty
Time required
 60 minutes or less
How to replace a lawn mower recoil starter on an OHV engine

How to replace a lawn mower recoil starter on an OHV engine

Replace the recoil starter if it doesn't move when you pull the starter rope.…

Read more
Repair difficulty
Time required
 15 minutes or less
How to replace a lawn mower wheel

How to replace a lawn mower wheel

Learn how replace a damaged wheel on a walk-behind lawn mower—it's a quick, easy fix.…

Read more
Repair difficulty
Time required
 15 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

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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Types of walk-behind mower blades video

Types of walk-behind mower blades video

Learn about the different kinds of mower blades and how to maintain them.…

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