A sloppy lawn immediately after mowing is a sure sign that the lawn mower has a dull blade. There can be two solutions: sharpen the knife yourself or take it to a service. Let's start with the first option.
How to sharpen your own lawn mower blade
For convenience, it is better to remove the knife (read more in our instructions). Before turning the mower over, be sure to drain the fuel tank and oil from the crankcase. Alternative way- put the mower on a solid frame or at least on two stools in order to “crawl” from below.
We must thoroughly clean the mower and remove the dried grass from the mower in the fall after the last mowing. But we might have missed something, or we were in too much of a hurry for short days and there was no more weather for the protective corrosion coating. The scissor blade is inspected - we can see with certainty if it is bent, broken, or otherwise deformed and shredded. We also cut the knife blade and remove it.
It is also necessary to monitor the degree of sharpness of the cutting edge of the blade. If you cut more than two-thirds of the blade's original width, we do not store or replace the blade with a new one. We buy a quality knife from the manufacturer for the brand mower. The knife has a longer service life and is also safer. A poorly knitted knife can break during chopping and cause serious injury or even death.
Sharpening by hand
If the knife is not very dull, it is enough to touch up the edges with a flat file.
- First remove the rust (if any) with a wire cloth or brush.
- Don't go for a razor-sharp edge - remove the rounds and burrs.
- Try to maintain the original sharpening angle and sharpen both blades evenly. Otherwise, an imbalance will appear, and the blade will “walk” from side to side. As a result - rapid wear of bearings and replacement of the engine.
To check the balance, you need to hang the knife by threading a pencil or nail through the central hole. Next, we look to see if one of the sides outweighs. If so, then the heavier side still needs to be filed.
An unbalanced blade vibrates during operation, and vibrations not only impair the comfort and safety of the lawn mower, but also abuse the machine and shorten its life. Knife sharpening can be entrusted to a workshop or workshop. We can do it ourselves in a workshop equipped with a suitable grinding machine.
It is important to check the balance of a sharp knife. We have special balancing equipment at a specialist workshop, but we can do it with a screwdriver that fits into the center hole of the knife. If one knife blade is tilted lower than the other, cut the blade to the heavier side to keep the blade in a horizontal position. We also check the knife holder, which is mainly made of duralumin. This part should not show signs of wear, cracks or damage.
Sharpening on the machine
ATTACH_BLOCK">Where to sharpen a lawn mower blade
If you do not have the skills or suitable equipment, it is better to contact the service center. Ask the craftsmen to check the balance of the knife. Then it is guaranteed to last more than one season. New blades should also be taken to the workshop - they also have an imbalance.
The blade blade blade, together with the so-called cross bolts, is a significant safety feature that prevents damage to the engine crankshaft when the blade hits a fixed obstacle. That's why this part must be in perfect order, just like the shift bolts, if necessary, a replacement kit must be made.
If we find an error, we will change the carrier. Trawl mowers usually have a small V-pulley on the blade carrier that drives a gearbox on the rear axle. So we check that the belt is not too loose and that the idler pulley is clean - of course clean the dirt.
And finally, a couple of tips:
- Wear gloves - cutting yourself with a knife costs nothing.
- Use a vise to clamp the knife.
- At least once a month during the season, check the condition of the knife.
The lawn mower, like any other cutting equipment, is equipped with blades that cut plants. When used, they tend to become dull and then the work of the lawn mower becomes laborious and painful for the operator working with this technique. Sharpening lawnmower blades is much cheaper than buying new blades for them.
Repair of a loose drive belt varies by manufacturer, so it is recommended that this problem be resolved after reading the operating instructions or consulting a service technician. After cleaning the skeleton, knives and other accessories, we must pay attention to the engine.
For accurate scheduling of maintenance such as an oil change, it is recommended to equip the machine with a clockwise computer or a tachometer. Both measuring devices are already in hobby design today at a reasonable price. However, it is recommended to change the oil at least once a year - preferably before the season, because, especially during shutdown, engine oil tends to bind water, thereby impairing its lubricating properties.
Rotary lawn mowers
The most common lawn mowers are rotary, they are the best-selling. But they all have an identical design, two sharp knives are placed in the body (or deck). They rotate at high speed, creating an air current that lifts the grass, and the blades cut it evenly. With the same air flow, the cut grass is sent to a specially built-in bag (grass collector). To make the air flow stronger, the knives are made in the form of blades, they are driven at high speed by an electric or gasoline engine.
It is always good to keep the quality of the oil as recommended by the mower manufacturer in the manual, or use the minimum specification oil. Unlike a car, there is no need to change such a large number of oil, the mower is usually about one liter.
Before replacing, it is recommended to start the mower and let the engine a short time so that the oil does not get hot. Then stop the engine, unscrew the drain plug at the bottom of the engine and let the oil flow into the collection container. If we do not reach the drain screw, the lawnmower may tilt and the oil will drain through the fill hole. We check its level according to the dipsticks - the oil should not be below the minimum level mark, but above the maximum level mark. From the air motor, especially when working on sloping terrain, oil can be sucked into the air filter and destroyed. Then pour new oil into the engine. . The air filter also deserves careful monitoring because the mower operates in a dusty environment and the filter prevents dust and even large impurities from entering the engine intake line.
The cost of sharpening lawn mower knives is from 250 rubles.
The electric motor is powered by electricity and has a limited radius of operation and depends on the length of the wire. Allows the operator to work only in dry weather to avoid injury electric shock. Be sure to carefully ensure that the cable is not accidentally cut, because the knives are very sharp and rotate at great speed.
Air filters differ depending on the type of engine. The engine is also screwed down and the spark plug checked. His appearance can tell a lot about the condition of the engine - if the spark plug is burned out, the engine is fine, if its spark gap is extremely black or otherwise colored, the engine is faulty and the engine needs to be adjusted by a specialist workshop.
The spark plug can then be cleaned with a wire brush and screwed back into the engine. Otherwise, this engine component does not need to be changed every year, depending on the load once every two years. We check the starter cord, which should not be frayed or too short. Of course, it is worth replacing a still functioning but damaged line before the season than in the season in order to be compensated for the broken cord.
The most mobile lawn mowers with a gasoline engine. They do not have a limited radius of work and electric shock will not occur. The main thing here is to observe the correct angle of inclination of the lawn mower so that the fuel evenly enters the engine, this angle is not more than 30 degrees. Mow steep slopes by carefully evaluating the surface of the mowed hill in order to protect the motor from damage as much as possible.
We are checking the cart status. Whether the mower is cloth or plastic, it needs to be clean with no vent holes so the basket can flow freely into the basket that drives the grass. Even the best mowers wear or get damaged due to continuous operation. Repairing these knives in case of more damage does not make much sense, further use this blade can damage your mower at the very least, which is why it's important to choose the right time to choose a new blade.
If you think that a small bend or hole cannot damage your lawn mower, be aware that this damage may be caused by an imbalance in the blade, which is constantly powered by the mower's motor, which can lead to large reductions in the entire drive system and the subsequent destruction of your lawn mower.
Proper sharpening of lawn mower blades
The knife has a crescent shape, cuts off, and does not cut grass. For the formation beautiful lawn it is important that the grass is evenly cut, but not pulled out of the ground, so the knife must be well sharpened. It is best to grind it on a grinding stand, but you can also use a regular drill with a grinding attachment for grinding. To do this, be sure to turn off the motor and remove the knife, then loosen the bolt at the fastening point and separate the knife. If the knife has screwed blades, then you just need to turn the blades. Next, evaluate the condition of the blunt blades, they can be bent from the impact of stones, in which case they are straightened with a hammer. A knife made from a single piece of metal requires only the corners to be sanded. It should be borne in mind that the metal must be removed in the same layer on both sides, otherwise the knife may become unbalanced and this may lead to failure of the lawn mower. Sharpening lawn mower blades requires the obligatory observance and control of the balance of both blades of the knife. It is best to use the time axis - put a knife on it, then it will be seen whether the knife sits evenly and it will be possible to control the uniformity of sharpening. If one side is heavier, it should be sharpened and balanced.
If you have been able to buy a blade in a motorized or electric mower, we are sure that you will run into the problem of having equivalent older mowers. Virtually every lawn mower manufacturer has their own design for the cutting blade for their mower blades, and there are virtually no standards in this area. This procedure is used to ensure that the mower blade cannot be sourced from a competitor manufacturer of mower brand parts. No store can collect all models that offer mowing knives, so finding a new blade can be a very time consuming task.
Exceptionally, all methods of sharpening lawn mower knives have one principle - this is the removal of a layer of metal from the cutting surface. This can be done either manually or using grinding machines, grinders, grinders.
It is best, of course, to contact a knife sharpening specialist. They correctly and competently sharpen and adjust the balance of knives. After all, it is impossible to evenly cut the grass with a blunt knife, its edges become loose and the lawn looks sick and unkempt. The sharper the knives are sharpened, the less sick lawn grass and the lawn looks better. The appearance of your lawn and, of course, the mood depends on this.
In this situation, they seem to be the perfect solution for a versatile scythe knife that successfully replaces most original knives. The key is to choose a new utility knife that is the same length as the old scythe knife, the same distance between the mounting holes and the correct profile.
Inner hole diameter and side hole pitch
Blade length is measured diagonally from the bottom left edge to the top right edge. The range of universal blades includes the most standard sizes: 15, 16, 17, 18, 19, 20, 21 and 22. The multi-purpose blades are the same width and thickness, which are approximately 5.6 cm and 3 mm thick. The inner mounting hole must be the same as the diameter of the propeller. For proper fit of the mower blade, the utility blades are sold with a reduction kit with diameters: 10.0 mm, 12.7 mm, 16.0 mm and 18.0 mm.
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