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MTD
Lawn Edger

Model # 25B-550A729 Official MTD edger

Here are the diagrams and repair parts for Official MTD 25B-550A729 edger, as well as links to manuals and error code tables, if available.

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Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

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Owner’s manual

Model diagram and schematic

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Showing 10 of 72 parts  |
Yard Machines Lawn & Garden Equipment Lock Nut, 5/16-18 (replaces 753-05591) 712-04063
#15

Flywheel/pulley/wheels diagram

Yard machines lawn & garden equipment lock nut, 5/16-18 (replaces 753-05591)

Part #712-04063

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Lawn & Garden Equipment Hex Flange Nut (replaces 753-05549, 912-0417a) 712-0417A
#5

Blade plate assembly diagram

Lawn & garden equipment hex flange nut (replaces 753-05549, 912-0417a)

Part #712-0417A

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Yard Machines Lawn Tractor Flange Nut (replaces 00012173, Wd-129-103) 712-04065
Yard machines lawn tractor flange nut (replaces 00012173, wd-129-103)

Part #712-04065

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V-belt 754-04032B
#18

Blade plate assembly diagram

V-belt

Part #754-04032B

Replaced by #954-04032B

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Manufacturer substitution
This part replaces 754-04032B. Substitute parts can look different from the original.
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$31.35 | 
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Blade Tri-c 781-0748
#23

Blade plate assembly diagram

Blade tri-c

Part #781-0748

Replaced by #781-0748-0637

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Manufacturer substitution
This part replaces 781-0748. Substitute parts can look different from the original.
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Blade 781-0080
#20

Blade plate assembly diagram

Blade

Part #781-0080

Replaced by #781-0080-0637

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Manufacturer substitution
This part replaces 781-0080. Substitute parts can look different from the original.
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Ace Lawn & Garden Equipment Push Cap 726-0299
#33

Flywheel/pulley/wheels diagram

Ace lawn & garden equipment push cap

Part #726-0299

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Adjuster Rod 747-04110
#15

Blade plate assembly diagram

Adjuster rod

Part #747-04110

Replaced by #747-04110A

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Manufacturer substitution
This part replaces 747-04110. Substitute parts can look different from the original.
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Yard Machines Lawn & Garden Equipment Wing Nut (replaces 01002925, 920-0279) 720-0279
#17

Flywheel/pulley/wheels diagram

Yard machines lawn & garden equipment wing nut (replaces 01002925, 920-0279)

Part #720-0279

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$6.87 | 
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Yard Machines Lawn & Garden Equipment Guide Bolt 710-1205
#13

Flywheel/pulley/wheels diagram

Yard machines lawn & garden equipment guide bolt

Part #710-1205

This item is not returnable
$5.01 | 
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Symptoms for gas walk-behind mowers

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

View all

Why does my lawn mower vibrate a lot?

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

Read more

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.…

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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 lawn edgers

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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Top 10 electric lawn and garden tools for 2023

Top 10 electric lawn and garden tools for 2023

Learn about the top 10 must-have electric lawn & garden tools for 2023…

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