Why Is My Lawn Mower Vibrating? Find Out Here

July 26, 2021

Why Is My Lawn Mower Vibrating? Find Out Here

The lawn mower is one of the most widely used tools in the yard and garden shed. When they work properly, mowers can make light work of maintaining your lawn.

However, if problems arise, it can become a bit of a nightmare, especially if you are not sure how to fix the problem.

If your lawn mower is vibrating and making a loud noise, or the mower is not running properly, you may need to fix it.

Vibrating and leaking oil are signs that you will need to repair your mower. You can buy replacement parts for your mower at your local repair shop.

What to do when your lawn mower is vibrating

Whether it’s a simple walk-behind lawn mower or a riding lawn mower, no one likes their lawn mower to be vibrating. Although it can be a minor annoyance, it can also be a sign of a serious problem.

In either case, it’s worth taking the time to figure out why your lawn mower is vibrating and to fix the issue before you end up with a lawn that looks more like a hayfield.

Check To See If The Blade Is Bent!

One of the most common problems people have with their lawn mowers is that it vibrates too much and sounds like it is out of balance. This is not a problem that is usually covered under a warranty, but it is fairly easy to fix.

If you have a bent blade, it will vibrate. All you have to do is remove the spark plug, spin the blades by hand, and feel for the blade that seems bent. If you find one, it's easy to fix by bending the blade back into line.

Lawn mower blades are made from steel and can get bent very easily. Bent blades cause the mower to vibrate as you cut the grass, which can damage your machine and also make mowing more difficult. 

Check The Crankshaft Isn't Bent

A lawnmower engine can often be damaged by vibration. If your lawnmower is vibrating more than when it was new, it may well be a sign that something is wrong with the engine.

Vibrations can often be felt through the handles of the mower. (This is not a good sign.) A bent crankshaft will mean your lawnmower must be replaced.

If you suspect that a lawn mower is vibrating excessively, the first thing to check is the crankshaft. While it is true that a bent crankshaft is often the cause of a lawn mower vibration, it is not always the case.

So, before replacing the crank, you should check that there is no play in the wheel bearings, that the flywheel is spinning normally, and that the blades are in good condition.

Check The Blade Adapter Pins

It is important to check your blade adapter pins are in good condition if you are experiencing vibration from your lawn mower blade.

The Blade Adapter Pins are a vital part of your lawn mower and need to be checked regularly.

The Blade Adapter Pins are a pair of bolts that hold the blade to the lawn mower. When these pins are worn they will need replacing.

I've been doing this for 20 years now and it's rare to fix a mower that has a solid vibration, but it does happen. Sometimes it's the blade adapter that is loose or has a burr on it.

Other times it's the blade holding bolt. If you can't find a loose part, chances are the problem is the blade itself.

Check The Flywheel Key

Check the flywheel key when your lawn mower is vibrating. The flywheel key is a small circular part that fits into a keyhole in the center of the flywheel.

This key serves two purposes: it holds the flywheel in place on the crankshaft that is connected to the engine, and it provides a connection point for the drive belt that connects to the wheel.

If the flywheel key is loose, the engine may vibrate, which will be transferred to the lawn mower.

Check The Blade Is Balanced

Before you buy a new lawn mower, you should make sure that it is balanced correctly, otherwise you may find it to be too heavy to push, which defeats the purpose of a mower.

Before you get started, you need to have all the information you need together. You will need to measure the blade (in millimetres) before you start.

If you are mowing your lawn and it vibrates more than usual, it could be that the blade needs to be balanced. The blade on a lawn mower is what does the cutting, and a wobbling or unbalanced blade can cause the mower to shake and vibrate when it is being used.

This can be a problem, as the vibrations can cause other parts of the mower to become damaged, such as the engine.

Check The Engine Is Tightly Bolted To The Deck

If your lawn mower is vibrating a lot, there’s a chance that it could be because the engine is slightly loose. This is usually a sign that the bolts that hold the engine to the deck are a little too loose. Results of the study show that the average lawn mower vibrates at around 25 hertz.

If the lawn mower engine is vibrating or feels like the deck is loose, there is a chance that the engine isn't securely bolted to the deck.

The first thing to do is check the bolts. A loose engine can cause damage to the lawn mower. This is why it's important to check that the bolts are tightened frequently. If the bolts are loose, you can tighten them with a wrench or socket.

Check The Lawnmower Handles

When your lawn mower is vibrating, check the handles! It’s a phrase you read time and again – and for good reason, because it’s true.

Many of the problems that occur with a mower are down to the handles. If they are not attached correctly, they can allow the vibration to pass up into the mower housing and to the handles, causing a vibration that will be very noticeable.

Last words

A lawn mower can be one of the most useful tools for any home owner. It can help you save a lot of time while cutting your grass. However, if you are experiencing a problem with your lawn mower and are not sure what the problem might be, you can ask a professional for help. But before you do, you must first determine what the cause of the problem is.

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My father, and his father before him, and his father; for the past 3 generations, my family have always been into gardening. The green fingers is a gift passed down to me and I thoroughly enjoy it! I also have worked in the manufacturing department for Bosch and DeWalt so I like to think I know a thing or two about tools and such!
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