DIY walk-behind mower repair

Don't let your grass grow out of control because your push lawn mower won't start, vibrates too much or doesn't cut well. Let Sears PartsDirect show you how to fix your gas mower with our troubleshooting tips and videos and step-by-step repair guides.

Preventive maintenance can go a long way toward keeping your gas mower in good operating condition. Learn how to tune up a mower at the beginning of each season and how to replace the cutting blade to get the mowing season off to a good start.

If you pull the starter rope and nothing happens, watch our video for troubleshooting tips on why a lawn mower won't start to figure out what's wrong. If your gas mower starts but won't move, there's a good chance the mower's drive system might be to blame. Get your mower moving again using the DIY tips in our video troubleshooting motion drive failures in a lawn mower.

If you have a different problem with your gas mower, check out our articles and videos page for additional troubleshooting tips. Once you find out what part to replace, our DIY repair guides give you detailed instructions to complete the job and get your lawn mower working again. To find the owner’s manual or a complete list of replacement parts for your gas walk-behind lawn mower, search for your model number.

Gas Walk-Behind Mowers

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: dirty carburetor, bad spark plug, clogged air filter, engine choke problems, clogged gas cap vent
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, bad ignition coil

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 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
 30 minutes or less
March 1, 2016
By Lyle Weischwill
How to replace a lawn mower front deck tray

Learn how to replace the front deck tray on your lawn mower if it's cracked or damaged.

Repair difficulty
Time required
 60 minutes or less
March 1, 2016
By Lyle Weischwill
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.

Repair difficulty
Time required
 60 minutes or less
March 1, 2016
By Lyle Weischwill
How to replace a lawn mower drive cable

The drive cable engages the transmission to spin the drive wheels and move the mower across the grass. Replace the drive cable if it's broken or frozen up inside the sheath.

Repair difficulty
Time required
 60 minutes or less
How to replace a lawn mower flywheel key on an OHV engine

The flywheel key couples the flywheel to the engine crankshaft. Replace the flywheel key if it's broken.

Repair difficulty
Time required
 60 minutes or less
March 1, 2016
By Lyle Weischwill
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
March 1, 2016
By Lyle Weischwill
How to replace a lawn mower blade

Check your lawn mower blade regularly and replaced it if it's bent or damaged.

Repair difficulty
Time required
 15 minutes or less
March 1, 2016
By Lyle Weischwill
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 cracked.

Repair difficulty
Time required
 15 minutes or less
March 1, 2016
By Lyle Weischwill
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.

Repair difficulty
Time required
 30 minutes or less
How to replace a lawn mower ignition coil on an OHV engine

Replace the ignition coil if it isn't sending electric current to the spark plug when you pull the recoil starter rope.

Repair difficulty
Time required
 30 minutes or less
March 1, 2016
By Lyle Weischwill
How to replace a lawn mower drive belt

Learn how to replace the drive belt on your lawn mower if it's worn or broken and won't drive the mower.

Repair difficulty
Time required
 60 minutes or less
April 1, 2013
By Lyle Weischwill
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
April 1, 2013
By Lyle Weischwill
How to replace a lawn mower starter rope

These step-by-step instructions show how to replace a broken starter pull rope on a walk-behind lawn mower.

Repair difficulty
Time required
 30 minutes or less
How to replace a lawn mower recoil starter on a flathead engine

If the starter rope on your walk-behind lawn mower won't retract, replace the mower recoil starter assembly.

Repair difficulty
Time required
 30 minutes or less
April 1, 2013
By Lyle Weischwill
How to replace a lawn mower safety switch

The safety switch stops the engine when you release the lever on the handle. This repair guide explains how to replace it if it's not working correctly.

Repair difficulty
Time required
 30 minutes or less
How to replace a lawn mower ignition coil on a flathead engine

If the spark plug doesn't fire when you try to start the mower, you could have a defective ignition coil. Follow these step-by-step instructions to replace it.

Repair difficulty
Time required
 30 minutes or less
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 replace this tiny but essential part.

Repair difficulty
Time required
 45 minutes or less

Articles and videos for gas walk-behind mowers

Use the advice and tips in these articles and videos to get the most out of your walk-behind lawn mower.

October 1, 2019

Types of walk-behind mower blades video

By Sears PartsDirect staff

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

May 31, 2019

How to tune up a lawn mower video

By Sears PartsDirect staff

See how to tune up your mower once a year to keep it running well.

April 9, 2019

Lawn mower parts and supplies to stock up on video

By Sears PartsDirect staff

Keep these 5 things on hand so you’re ready to mow grass all season long.

September 1, 2016

Lawn mower won't start troubleshooting video: can't pull recoil starter rope

By Sears PartsDirect staff

A blade obstruction, bad recoil starter or locked-up engine can prevent the recoil starter rope on your mower from working. See how to fix the problem.

September 1, 2016

Lawn mower won't start troubleshooting video: spark plug and ignition problems video

By Sears PartsDirect staff

Find out how to test and fix problems with the spark plug, stop wire, ignition coil and flywheel.

September 1, 2016

How to winterize a lawn mower

By Sears PartsDirect staff

Your lawn mower will last longer and run better if you take these steps before storing it for winter.

September 1, 2016

Lawn mower won't move troubleshooting video: motion drive failure

By Sears PartsDirect staff

Find out whether a broken or disconnected drive cable is the reason why your lawn mower won't move.

September 1, 2016

Lawn mower won't start troubleshooting video: fuel, ignition and compression problems video

By Sears PartsDirect staff

Check whether a clogged air filter, bad spark plug or contaminated gas is why your lawn mower won’t start.

June 1, 2016

How to mow a lawn for healthier grass

By Erin Hynes

How often and tall you mow your lawn has a big impact on its health. Check out these 3 rules.

May 1, 2016

How to sharpen a lawn mower blade

By Sears PartsDirect staff

A dull blade leaves grass tips tattered. Sharpen it several times a season. Here's how.

April 1, 2016

6 sure ways to destroy a lawn mower

By Sears PartsDirect staff

Tired of mowing? Here's our tongue-in-cheek advice rendering your mower useless.

March 1, 2016

How to change a lawn mower wheel video

By Sears PartsDirect staff

It's easy to install a replacement wheel on your walk-behind lawn mower if the wheel is damaged. Just follow the steps in this video.

February 1, 2016

6 weeks to a better lawn

By Erin Hynes

Do these 5 things this spring for a lawn that's healthier all summer.

April 1, 2015

How to keep grass clippings from sticking to a mower deck

By Sears PartsDirect staff

Prevent your mower deck from rusting by following our advice for keeping grass clippings from sticking.

March 1, 2015

Easy DIY lawn mower repairs

By Sears PartsDirect staff

Learn what lawn mower repairs you can do easily by yourself.

January 1, 2015

Walk-behind lawn mower common questions

By Sears PartsDirect staff

Learn more about your lawn mower from the answers to these often-asked questions about walk-behind lawn mowers.