The ignition coil is an induction coil that is located next to the flywheel. But the ignition coil is not required for diesel engines that completely rely on compression to ignite the fuel. The mower gearcase, also known as the transmission, utilizes the power of the motor to turn the wheels of a self-propelled mower. Oil or lubricant is important for reducing wear and friction.
The air filter of the mowers can clean-off contaminants from the air before it reaches the engine. The blade is one of the most important parts of lawnmowers. The lawnmowers may consist of one or multiple blades for slicing the lawn at a certain level. Mulching lawn mowers are more friendly to the environment because their blades cut the grass into pieces small enough to rapidly decompose and return vital nutrients to the soil.
This reduces the need for adding fertilizer to the lawn and saves space in landfills that might otherwise be taken up with bagged clippings.
However, bagged clippings can be sent to municipal compost sites instead of being taken to the dump. Another consideration is the environmental impact of a rotary mower on the grass it cuts. While reel mowers cut with a scissor-like action that helps the grass retain moisture, rotary mowers tear the grass unless the blade is kept sharp.
That tearing action can expose the grass to more diseases. The cooking oil that once fried your fries or onion rings can now be used to power your lawn mower. Hobbyists and inventors have been modifying motors to run on biodiesel fuel for years, but now lawn mower companies such as Toro are offering conversion kits that allow diesel-powered commercial mowers to run on a blend of biodiesel and diesel fuels.
Biodiesel is an alternative fuel that uses converted vegetable oil or fat and burns more cleanly than diesel fuel. And the company has plans to develop mowers that run entirely on the renewable resource in the near future. Modern rotary lawn mowers have made several advances over their predecessors, especially in safety features.
Today's mowers come with a blade brake control on the handlebar that stops the blade if the operator releases the control, or a kill switch that stops the motor entirely. They also come with a foot shield at the rear of the mower to prevent loose objects from being discharged and to prevent feet or other objects from entering the blade deck.
Riding lawn mowers come with safety features that cut the motor if it tips over, and commercial models now routinely come with roll bars to prevent the operator from being pinned or crushed.
Riding lawn mowers also come with a wide variety of luxury options, including automatic transmissions , adjustable seats, cruise control , stereos and even beverage cup holders. Many riding mowers can also tow attachments that allow them to plow snow, till the earth, spread fertilizer and do other duties that turn them into multipurpose machines.
Walk-behind mowers aren't without their options, though. Large rear wheels in newer models help turn the mower more easily, and push-button electric starters eliminate the tedious task of pulling a recoil line to get the mower going.
But the newest advance in lawn mowers is not an addition, but a subtraction. A new crop of lawn mowers doesn't need an operator, because it operates itself. Robotic lawn mowers can mow your lawn while you're sipping a cool drink on your hammock. Most robot lawn mowers run on cordless rechargeable batteries, and some are charged by solar power.
So you can feel good about the environment while you're sipping that drink, too. Many of the elements of future lawn care are already here today, and they're making it easier, greener and more efficient to keep the grass neat and trim. Robots are already available to cut your yard for you, but in the future larger, more powerful robotic lawn mowers could cut large fields and golf courses and otherwise be used for commercial landscaping. Those lawn mowers could run on electricity powered by the sun, if the technology improves.
Or they could run on biodiesel or hydrogen fuel cell technology already under development. And researchers are always looking for ways to cut the grass more effectively, from improved mulching techniques to self-sharpening blades. For lots more information on lawn mowers and home improvement technology, see the links on the next page. Sign up for our Newsletter! Mobile Newsletter banner close. Mobile Newsletter chat close. Mobile Newsletter chat dots. Mobile Newsletter chat avatar.
Mobile Newsletter chat subscribe. Lawn Care. How Lawn Mowers Work. The quest for the perfect lawn can be achieved with the help of a lawn mower. Rotary Lawn Mowers No matter how big or complicated, every rotary lawn mower needs a motor to make the blade spin fast enough to cut the blades of grass cleanly.
Two-cycle and Four-cycle Motors. That rope you have to pull on ten times to get the mower started manually spins the engine, which forces it to suck in air and fuel. This mixture is ignited by a spark plug , which gets its electricity from a flywheel that rotates along with the engine. As it spins, magnets attached to the flywheel pass over an ignition coil to create a magnetic field, which generates electricity and sends voltage to the spark plug.
The flywheel also serves as a cooling fan thanks to fins attached to it and as a shock absorber when the blade hits a rock or tree roots. It also provides momentum to keep the engine rotating between combustion cycles. The ignition of the air and fuel mixture results in a controlled explosion that drives a piston down and rotates a crankshaft.
A typical engine on a walk-behind mower is about cubic centimeters in size, whereas the engine in a compact car is over ten times that. But on a lawn mower, that rotation is directly transferred to a cutting blade.
When the turf is wet, clumping is common with mulching lawn mowers because of the excess water present. There is a growing movement among people with small, easily managed yards, back to "old-fashioned" push-type reel lawn mowers. Newer versions are smaller, lighter-weight, and easier to push than the old clunkers you may have used as a youngster.
They have the advantage of quiet, fuel-free operation, and can provide good exercise at the same time. Reel lawn mowers have a series of revolving blades that cut against a stationary bedknife, much like a scissors. While reel lawn mowers provide the finest quality of cut available, they are expensive, not easily adjusted, and require specialized equipment for sharpening. Also, they can't be used where stones, twigs, or other debris are a problem because of potential damage to the cutting units.
They are also not well adapted for use in higher heights of cut. Keep all mowing equipment in good working condition. Consult lawn mower manual for annual routine maintenance practices.
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