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


Grass that builds up on the underside of your walk-behind lawn mower deck disrupts airflow needed to lift the grass for a clean, even cut. It also can lead to rust and corrosion of the mower deck. This video gives 3 tips on how to prevent the grass from clumping under your mower deck.
For more DIY help, including troubleshooting videos and step-by-step repair guides, check out our walk-behind mower repair help’ section. In addition, find the lawn mower parts you need to fix your mower.
The following tips can help avoid grass buildup under a lawn mower deck. Caked-on clippings disrupt the airflow and encourage rust and corrosion.
Use a spray lubricant
MO-DECK keeps grass from sticking and prevents rust.
Mow only when it's dry
Grass is sticky when wet.
Keep clippings short
Cut no more than 1/3 of the grass height. Shorter clippings blow away easier—and a trim is less of a shock for the grass than a crewcut.
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: engine needs tune up, dirty or clogged carburetor, damaged flywheel key…
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: stale gas, engine needs tune up, bad spark plug, dead battery, bad recoil starter, faulty safety switch, ba…
Main causes: uneven wheel height settings, damaged wheel, dull or damaged cutting blade…
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 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 cr…
Repair difficulty
Time required
15 minutes or less

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…
Repair difficulty
Time required
60 minutes or less

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
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.

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