Skip to content
Home » DIY » Lawn mower bogs down? Try this.

Lawn mower bogs down? Try this.

If your lawn mower bogs down in thick grass or under any other heavy load, there are a couple of possible reasons for it. Fortunately they are also things you can fix yourself.

The quick temporary fix

The quick temporary fix almost everyone eventually stumbles upon is to tip the mower up just when you start to hear it bog down. This helps the mower discharge the clippings under the deck and save the engine from cutting out, but it’s usually only temporary. If it starts happening early in the job, you can expect to have to tip the mower more and more frequently until you get it done.

Cleaning your deck to stop your mower from bogging down

The most common reason why lawn mowers bog down, especially mulching mowers, is grass clippings sticking to the underside of the deck. If your mower packs in too many clippings, there’s not enough room for the clippings to cycle and the blade to keep turning.

Fixing this is easy enough, it’s just a messy job. Pull the wire on the spark plug, then flip the mower over. Scrape away the clippings stuck to the underside. I typically use a putty knife, then come in with progressively smaller screwdrivers to scrape out anything that’s left. Then I follow up with a stiff brush.

After cleaning the deck, apply a bit of oil to it to keep the grass from sticking to it. Cooking spray is the cheapest option and works fine. Don’t use petroleum-based oil, as it’s not good for the grass if some of it drips down onto it.

Adjust your mower height

Lawn mower bogs down

If your lawn mower bogs down, it’s not just that it’s Spring. There are things you can and should do about it. This mower is set to cut too low, and that’s not doing the mower or the lawn any favors.

Trying to cut too much grass can also cause it to bog down. You should only be cutting the top 1/3 of the grass. That’s best for the grass’ health and that’s what the mower is designed to cut. So as tempting as it is to lower your mower height all the way down so your cut lasts longer, doing so isn’t good for your grass or your mower, especially if it’s rained recently and the grass is wet.

You don’t have to use precision instruments to determine it. Just roll the mower onto the grass, then adjust the height of the mower until about 1/3 of the grass height is over the lower lip of the mower. That’s close enough.

And it’s best not to use the lowest setting on the mower anyway. Your mower needs air flow to keep from clogging up, so try to avoid using the lowest setting if you can.

Be sure to check one more thing

If you have a gas-powered mower, there’s one more thing you want to check if your lawn mower is bogging down. Check the oil. Especially early in the season, if you forgot to change or top off the oil, you’re prone to be low. Being low on oil along with these other issues isn’t a good combination, so make sure you’re got enough oil. And if you haven’t changed it this season, go ahead and change it, don’t just top it off. Topping off dirty oil won’t do your mower any favors. Instead of going to the hardware store, go to the auto parts store and buy some 10W30 synthetic. You’ll only need 20 ounces of it, but that just means you’ll get three oil changes out of two quarts.

And while you’re at it, if you don’t use Marvel Mystery Oil in your mower, I recommend you start. Here’s why.

And if you’re wondering, I am a fan of electric mowers. While I wouldn’t necessarily recommend getting rid of a gas powered mower that’s running well in favor of an electric, when you’re in the market again, be sure to consider electric.

If you found this post informative or helpful, please share it!
%d bloggers like this: