Murray
Gas Walk-Behind Mower

Model # 7800240 (NM2255) Official Murray lawn mower

Here are the diagrams and repair parts for Official Murray 7800240-NM2255 lawn mower, as well as links to manuals and error code tables, if available.

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Model diagram and schematic

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Showing 10 of 159 parts  |

Hln-1/4c-bz 7076978SM
Hln-1/4c-bz

Part #7076978SM

Replaced by #703232

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Manufacturer substitution
This part replaces 7076978SM. Substitute parts can look different from the original.
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Flange Nut 7091601SM
Flange nut

Part #7091601SM

Replaced by #703409

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Manufacturer substitution
This part replaces 7091601SM. Substitute parts can look different from the original.
$9.27
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Lawn & Garden Equipment Bolt 340720MA
#19

Deck - push, m22550fc diagram

Lawn & garden equipment bolt

Part #340720MA

Replaced by #703225

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Manufacturer substitution
This part replaces 340720MA. Substitute parts can look different from the original.
This item is not returnable
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Hcln 3/8c Gr 7091585SM
Hcln 3/8c gr

Part #7091585SM

Replaced by #703347

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Manufacturer substitution
This part replaces 7091585SM. Substitute parts can look different from the original.
This item is not returnable
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Blade  22  W 7100851YP
#9

Engine/blade/front cover diagram

Blade 22 w

Part #7100851YP

Replaced by #7100851AYP

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Manufacturer substitution
This part replaces 7100851YP. Substitute parts can look different from the original.
This item is not returnable

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$21.24
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Walk-behind Lawn Mower Engine Assembly 7101449YP
#1

Engine/blade/front cover diagram

Walk-behind lawn mower engine assembly

Part #7101449YP

In Stock
Door Rear 22 7101243YP
#14

Deck - push, m22550fc diagram

Door rear 22

Part #7101243YP

In Stock
Briggs And Stratton Handle, Lower, Mur 7300706AMA
Briggs and stratton handle, lower, mur

Part #7300706AMA

In Stock
Lawn Mower Screw 7090824YP
#13

Engine/blade/front cover diagram

Lawn mower screw

Part #7090824YP

In Stock
Lawn Mower Zone Control Cable 7100074YP
#5B

Handles & controls - push diagram

Lawn mower zone control cable

Part #7100074YP

In Stock

Symptoms for gas walk-behind mowers

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

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

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

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

Main causes: drive control cable failure, worn or broken drive belt, bad transmission, broken drive wheel…

Main causes: stale gas, engine needs tune up, bad spark plug, dead battery, bad recoil starter, faulty safety switch, ba…

Main causes: dirty carburetor, bad spark plug, clogged air filter, engine choke problems, clogged gas cap vent…

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.

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.…

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.…

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.…

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.

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.…

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.…

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.…