Walk-behind lawn mower repair guides

If your walk-behind lawn mower won't start, the engine runs rough or the mower doesn't cut grass like it should, learn how to fix it by following the steps in these DIY repair guides and videos. Our lawn mower repair help covers major brands, like Craftsman, Poulan and Snapper. Search your model number to find a complete list of replacement parts, then order the part you need.

gas-walk-behind-mower

Repair guides common to all 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 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 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 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
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
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
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 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
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
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
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 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
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
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
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

Symptoms for gas walk-behind mowers

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

Main causes: drive control cable failure, worn or broken drive belt, bad transmission, broken drive wheel
Main causes: uneven wheel height settings, damaged wheel, dull or damaged cutting blade
Main causes: stale gas, engine needs tune up, bad spark plug, dead battery, bad recoil starter, faulty safety switch, bad ignition coil
Main causes: dirty carburetor, bad spark plug, clogged air filter, engine choke problems, clogged gas cap vent
Main causes: damaged cutting blade, loose cutting blade, damaged flywheel key, engine needs tune up
Main causes: engine needs tune up, dirty or clogged carburetor, damaged flywheel key

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.

January 3, 2020

How to prevent grass buildup on your walk-behind lawn mower

By Sears PartsDirect staff

Learn 3 tips to keep the underside of your mower deck grass-free.

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.