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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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Model diagram and schematic

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ALL PARTS
Showing 10 of 104 parts  |
Kill Switch 746-0912
Kill switch

Part #746-0912

Replaced by #946-1130

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Manufacturer substitution
This part replaces 746-0912. Substitute parts can look different from the original.
This item is not returnable
$14.49 | 
12% OFF Phone Price : $16.49
In Stock
Aircap Lawn Tractor Screw (replaces 150011, 910-0134) 710-0134
Aircap lawn tractor screw (replaces 150011, 910-0134)

Part #710-0134

This item is not returnable
$6.55 | 
13% OFF Phone Price : $7.55
In Stock
Yard Machines Lawn & Garden Equipment Guide Bolt 710-1205
Yard machines lawn & garden equipment guide bolt

Part #710-1205

This item is not returnable
$5.01 | 
17% OFF Phone Price : $6.01
In Stock
Toro Lawn & Garden Equipment Lock Washer (replaces 936-0169) 736-0169
Toro lawn & garden equipment lock washer (replaces 936-0169)

Part #736-0169

This item is not returnable
$5.26
In Stock
Hex Nut 712-0267
Hex nut

Part #712-0267

Replaced by #712-3010

?
Manufacturer substitution
This part replaces 712-0267. Substitute parts can look different from the original.
$7.71
In Stock
Lawn & Garden Equipment Washer 736-0258
Lawn & garden equipment washer

Part #736-0258

This item is not returnable
$6.87 | 
13% OFF Phone Price : $7.87
In Stock
Carriage Bolt 710-0260
Carriage bolt

Part #710-0260

Replaced by #710-0260A

?
Manufacturer substitution
This part replaces 710-0260. Substitute parts can look different from the original.
This item is not returnable
$6.55 | 
13% OFF Phone Price : $7.55
In Stock
Toro Lawn & Garden Equipment Push Nut 726-0233
Toro lawn & garden equipment push nut

Part #726-0233

This item is not returnable
$6.23
In Stock
Yard Machines Lawn & Garden Equipment Washer (replaces 936-0105) 736-0105
Yard machines lawn & garden equipment washer (replaces 936-0105)

Part #736-0105

This item is not returnable
$6.29
In Stock
Wave Washer 736-0504
Wave washer

Part #736-0504

Replaced by #936-0504

?
Manufacturer substitution
This part replaces 736-0504. Substitute parts can look different from the original.
$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 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 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 cut unevenly?

Main causes: uneven wheel height settings, damaged wheel, dull or damaged cutting blade…

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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 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 vibrate a lot?

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

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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 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 transmission

How to replace a lawn mower transmission

Learn how to replace the transmission on your lawn mower if it's locked up or won't drive the wheels.…

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

How to replace a lawn mower carburetor

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

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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