Lawn mower repair is an excellent way to get your feet wet in engine repair. They’re simple machines that can serve as a good launching pad for more difficult undertakings, such as automobiles and trucks. There are several lawn mowers that can be repaired without any knowledge of how they work.
Riding lawnmowers and walk-behind lawnmowers are the two most frequent types. Here, we’ll be focused on gas and walking mowers, but a few things will also apply to riding mowers, battery-powered mowers, and wired electric mowers.
The Engine Is Similar to the One in Your Car—Just Way Smaller
Using an automobile analogy, imagine your lawnmower has a whirling blade installed on its underside that cuts the grass as you “drive” across your yard. So, that’s what they are in essence—just on a much, much smaller and more manageable size.
When you manually spin the mower’s engine ten times to get it going, it draws in air and fuel. Through a carburetor, air and fuel are mixed together before they are fed into an engine’s combustion chamber.
Spark plugs are used to ignite this combination, which is powered by a flywheel that revolves with the engine to provide the necessary electricity. As the flywheel rotates, magnets attached to it pass over an ignition coil, creating a magnetic field that creates energy and delivers voltage to the spark plug. The flywheel is also a cooling fan and a shock absorber, thanks to the fins attached to it (when the blade hits a rock or tree roots). between combustion cycles, it acts as an engine propellant.
In the event of a controlled explosion, the air and fuel combination is ignited, driving a piston down and causing a crankshaft to turn. It’s a lot like your car’s engine, but smaller. Walk-behind mower engines are typically 150 cubic centimeters in capacity, whereas a small automobile engine is more than 10 times larger.) Engine rotation is transmitted to wheel movement on a car’s rims and tires. On a lawn mower, on the other hand, the cutting blade receives the rotation immediately.
The engine is the lawn mower’s most critical component, and it requires regular maintenance, such as oil changes and the replacement of the spark plug and air filter. With good care, such as adding stabilizer to the fuel and never letting the fuel stay in the engine for more than a few months, the carburetor requires very little maintenance. However, old gas can decompose inside of the carburetor and cause it to clog up very quickly.
The Blade Control Handle Is a Crucial Safety Feature
In order to start and run an engine on a lawn mower, you must press and hold down a lever that is near the handle. The blade control handle or brake bail arm is the technical term for this part. Let go and the blade will come to a complete halt as soon as you release your grip.
It’s a quick and easy way to stop the mower after mowing, but it’s also a safety feature that could save your life if you trip or fall while cutting the grass.
Here’s the breakdown: Both of these functions are accomplished by connecting the handle (by cable) to a mechanism located close to the engine. It grounds out the ignition and applies a flywheel brake to stop the engine (and the blade) as rapidly as possible.
In the unlikely event that the grounding wire or brake pad comes free, or the cable snaps, you’ll want to grasp how this safety mechanism works before tackling the repair.
The Deck and Cutting Blade Create a Suction to Cut the Grass
Think about how a whirling blade would affect the grass. In order for grass to stay put when you swipe something over it, the grass must be so light that it travels away. As a result, your lawnmower must take it into account.
Take a look at your lawn mower’s blade, and you’ll see that it’s not a flat, straight surface all the way across. Instead, there are tabs on the ends of the blade that curve up slightly, which provide lift and suction. Grass is sucked into the mower deck’s enclosed space as the mower moves over it, creating a vacuum. This forces the grass to stand up upright while the blade makes its way through.
But even if it’s primarily physics doing all the work, it’s still crucial that you inspect the blade occasionally and sharpen it if it’s not cutting the grass very well. Or replace it if it’s fully worn out.
As if reading about lawn mowers wasn’t enough of an educational experience on its own, you now have a better understanding of physics. In spite of their numerous moving parts, lawn mowers are relatively simple machines that are straightforward to fix.
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