How to properly install a knife on the grass trimmer

Trimmer cutting system: disc, trimmer line or knife?

When we slice a loaf, the main thing we care about is whether the knife cuts well. At this point, such nuances as the beauty of the knife, its value, or even its uniqueness become secondary. This is also true for electric and petrol lawn mowers. The main function of a lawnmower is to cut grass, weeds and bushes. That is why it is the cutting system that is the most important element of its design. Certainly, such parameters as engine power, comfortable belt, shape of the bar and handle play an important role, but in case of a blunt, faulty or inappropriate cutting system the mowing will not work at all.

Lawn mowers consist of a shaft with a motor at one end (above) and a mowing head with a spool that contains a line for a trimmer. The set also includes a blade. Use the line for mowing grass (wet or dry), mowing trees, posts, fences, smoothing lawns, etc.д., But overgrown bushes can only be trimmed with a lawnmower with a blade (disc). If you’re still undecided about which lawnmower you need, with the information. Choosing a brushcutter: 10 ground rules.


The line for the trimmer, or as it is called cord, is fixed on the reel and covered with a semicircular protective cover. The line for trimmers has a large enough cutting grip. Two pieces of fishing line are pulled out and fixed before work. A motor rotates the reel, straightening the ends of the line and turning them into sharp cutting tools. Excess ends of the cord are cut with a special knife in the hood, thus adjusting the width of the mowing. If the scythe has a semi-automatic line release system, you only have to push the rotating spool against the ground surface. Sometimes there is an automatic system. the trimmer line runs out to the correct length every time you start up the brushcutter. Very handy, but not economical.

To reduce stress on the engine, keep the filament spool parallel to the ground at 5-10cm (3-10 in) to mow. If the grass is very tall (above 20 cm), mow the tops first, and then the rest of the grass, as long grass can get wound up on the fishing line spool, the gearbox or even on the cable and jam the tool. The world’s leading lawnmower companies Hyundai, Honda, DAISHIN, Makita provide for built-in effective system, which does not allow the grass to wind up on the trimming head.

the line for your trimmer is easy to feed while working. To improve the effect, mow in the same direction as the line reel rotates: the grass will fly away from you, not towards you.

And one more tip: Mow grass with the tips of the line (especially along the house wall). don’t let the engine overload.

How to install a blade of grass on a cordless brush cutter

You need the right tools for great results in your garden. On the Husqvarna brush cutter it’s very easy to change the blade support. Just watch the video and follow the instructions. You can use a workbench or bench to make the procedure easier, which will also help you avoid losing the screws in the grass.

  • Remove the battery.
  • Fold the handle and flip the hedge trimmer over so that it rests on the handles.
  • Remove the grasshopper cover and grasshopper blade holder.
  • Use a flathead screwdriver to loosen the blue cord feeder and remove it.
  • Use a socket wrench to remove the locknut while holding the support cup.
  • Remove the support cup.
  • Put the master disc in its place.
  • Place the grass knife on the drive disc.
  • Place the base plate on top of the blade.
  • Place the support flange in the cup.
  • Put the lock nut back in place. Insert hex key into small hole on top of hedge trimmer gearbox. Rotate the blade until the hexagon socket wrench locks in place. Then use the hexagon socket wrench to tighten the lock nut.

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Mounting a diamond disc

This operation does not differ in appearance from that of a typical saw blade, but requires even more attention, care and monitoring.Remove the filament spool by blocking the gearing shaft with a pin or a screwdriver of suitable diameter and turn the filament container counterclockwise.

Try the diamond disc on to the lower slot washer and make sure the fit is larger than the diameter of the seating ring on the washer. High revolutions may cause displacement of the circular sawblade and unbalance that will inevitably lead to tool breakage and even injury of the operator or people nearby.

Let’s try on compensating washers one by one and choose the one that suits the width and the gap between saw blade fitting place and centering band of the lower washer completely.

Let’s install one after the other the lower washer with wear band, the diamond disc, the upper washer and the protective cup that will redistribute the clamping force over a larger area.

The whole resulting package on the gearbox shaft tighten the nut with a left-hand thread, first by hand, and then with a socket wrench, blocking the bottom of the shaft of the gearbox with a suitable screwdriver.

Remove the protective cut plastic tube from the teeth and check once again that the saw blade is firmly attached to the gearbox shaft. If it proved to be reliable, the grass trimmer with the diamond disc installed is completely ready for both traditional and non-designated tool work.

Putting it to the test

For safety you need a helmet with a clear face shield and gloves to protect your hands.

At the beginning we try to remove thinner dry branches first, then gradually testing with the larger ones. Then we finish with 7-8 cm diameter dry and semi-dry tree trunks.

We make sure that the grass trimmer with a diamond disk works quite effectively, reliably and safely. Cuts, both transverse and oblique, turn out very smooth. No crumpled or torn wood fibers visible.

Grass cutting with diamond discs is also quite comfortable, efficient and productive regardless of its height, density and level of dryness. So, a grass trimmer with a circular saw blade not only perfectly performs its direct function (mowing grass), but also expands the field of application (removing knots and branches from trees, and sawing thick trunks).Attention ! It is not worth getting carried away with the installation of large diameter and thickness saw blades on the grass trimmer, as this will cause an increased load on the gearbox and motor, and possible premature breakdown. Also safety of work with such tools will decrease, what should not be allowed in any case.

What to mow with a toothed disc

If the blade has eight or more blades, it is already called a disc. Number of tines varies from eight to forty. Multi-tooth disk is made of strong steel. Sharpened on both sides. The base is big and the teeth are small and sharp. It works like a saw. It rotates and cuts. The disk has to be installed very carefully. straight and well fixed.

The saw blade is needed for cutting down thin tree trunks. Even a fully formed trunk can be cut by carefully sawing it from different sides.

But the disk is not only intended for cutting down young growth. You can mow grass for hay, too. Especially dry and hard. The main thing is to choose the right disc. a light one with a peoriated base. That way the grass won’t cut too much. It makes a difference when you’re cutting low grass for hay.

They put a little bit of tungsten carbide on the discs, too. Though, according to users’ reviews, they fall off very quickly and are of little use. Only the weight becomes heavier.

If you’re going to saw trunks, you can also fit a circular saw blade. It’s a very good saw, especially if you set the teeth a bit apart. But when you install a circular disc, you are very risky. You risk damaging your tool because the load on the reduction unit increases tenfold. Powerful motor (2-3 liters).с.) will pull such a blade with no problem, but it’s hard to foresee how the gearbox will behave. Therefore, such a substitution can be done only if you are sure that the reducer is hardy and professional.

What is the best line diameter??

For different freshness and softness of the grass you need different line diameter. But we want to tell you right away. read the data sheet of your tool carefully. If the manufacturer has specified that the allowable line for a trimmer is no more than 1.2 mm, then don’t try to wind a two-millimeter. Don’t take too long to mow. Overheats motor from stress.

  • 1.2 mm. 1.6 mm. slender. Used for lawn care, constant and frequent mowing. Recommended most often for electric trimmers, 0.5 to 0.7 kW.
  • 2 mm. 2.4 mm is the most popular cord. Suitable for units of medium power. the most common among dacha owners. Cuts both young and old grass, stiff and overgrown.
  • 3 mm. 3.2 mm Suitable for heavy-duty professional petrol-driven power washers. Thick strings can easily handle even rough weeds and dead wood.
  • 4 mm. the thickest. Some aluminum is added to the nylon for strength. Used rarely, because the power of the engine, as a rule, puts restrictions on this diameter. But if your motor allows it, fill it up and cut the weeds.

Often manufacturers paint different diameter trimmer line in different colors. green, blue, orange. to make it easier for users to understand. Coil diameters range from 10 meters to 100 meters.

Installing the blade on the grass trimmer. video

Read our video on how to change the blade on your STIHL gasoline trimmer. Note that the installation steps may vary slightly depending on the model. Therefore, do not forget to look at the instructions!

If the disc on the trimmer is used regularly, it needs to be removed and sharpened or replaced with a new one from time to time. This part can be made of metal or plastic, have a different number of blades, but the replacement process remains the same. over, this procedure is similar for equipment from different manufacturers, whether Carver or Huter, but there may be minor differences. Changing the blade on the trimmer is simple enough, if you follow the safety precautions and know the correct procedure, the description of which can be found in the user manual. The entire replacement process, step by step, as well as the method of sharpening the blades yourself, will be described in this material.

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When the use of blades is relevant

When using a brushcutter on country plots, the most popular attachment is a line for the trimmer. It is inexpensive, suitable for various trimmer heads, safe to use. The disadvantage of using a fishing line is that it is convenient only for mowing low growth. In other situations, the string is immediately clogged, regardless of whether a gasoline or electric grass trimmer model is used. In addition, vegetation wraps around the spindle, which creates considerable resistance to the shaft and leads to its breakage. This can also cause the piston system in chain saws to malfunction and the motor in electric trimmers to burn out.

That’s why different mowing heads are used for high or tough vegetation. Thus, for cleaning tall and rough grass, thin shoots of trees and shrubs, it is better to install and use a disc. This nozzle clogs much less often, which contributes to the greater durability of the equipment.

For your information! Due to the fact that the motor of electric and battery-powered models is less powerful than that of petrol mowers, so the use of discs is more relevant for petrol mowers.

Assembling a hand-held mincer

Before assembling make sure all components are clean and dry. Otherwise the mower will be out of order in no time.

Now we will consider step by step how to assemble a manual trimmer:

  • Take the auger shaft and place it in the center of the body. Note that the wide part should be on the side where the handle will be attached and the thin part on the side of the blade.
  • On the other side of the auger, place the blade so that its flat side faces outward. If you are dealing with a circular knife, there should be a knurled part with edges near the grate.

How to assemble an electric meat grinder

If you know how to assemble a manual meat grinder correctly, then folding an electric meat grinder will not give you any problems.

  • First, connect the gear housing to the metal auger housing. To do this, insert in the slot and turn counterclockwise until the characteristic snap. If the parts are loose, the motor will not be able to operate the auger shaft properly.

Plastic circles on the grass trimmer. when to use

While metal milling and paddle discs are used on gasoline trimmers, plastic discs are recommended for electric tools. Their main advantage is their low weight, so the strain on the electric motor is completely eliminated. Structurally the mowing head is a plastic base plate on which the blades are fixed along the perimeter. The blades are made of soft plastic, which bends without deforming when in contact with an obstacle. The blades are mounted on a circular base at a 120 degree angle.

They are designed for mowing dense grass with electric trimmers, when the trimmer line cannot cope. If the nozzle has a large moment of inertia, it can be reduced by making symmetrical holes. When the tines are blunted, they need to be sharpened at 30 degrees with a low to medium roughness grinding wheel.

Disc design Application Characteristics
Milling peorized with 40 teeth For a clean cut of lawns and high grass. A great option for mowing grass in fields and wooded areas Eliminates wrapping of grass on disk and low stress on gearbox. Highly effective for large volumes of grass
Cutter with more than 40 teeth (60-80) For small trees with a stem thickness of 7-8 cm Suitable for mowing grass with small growing trees
Solid with 8 to 32 teeth Cutting of thin and stiff raspberry and currant bushes. Effective at cutting grass, but only with high horsepower equipment Effectively cuts stems of small shrubs. Put more load on the gearbox
Paddle discs with one, two and three blades Stiff grass, thistles Breaks the grass several times, shredding it, which increases the load on the gearbox
Blade with 4 knives or more Overgrown and stiff grass cutter, can be used for haymaking Has a low moment of inertia
Plastic discs For small and dense grass in homestead areas Does not overload electric motors of trimmers

Sharpening trimmer blades correctly. what you need to know about it

During the exploitation of lawn mowers with metal cutting blades, their dulling is observed. It is a normal phenomenon, but such attachments should not be used any longer. Blunt blades have low performance, so in addition to unsatisfactory mowing results, you will also get overheating of the tool engine and wear of the gearbox. If the blades or teeth of the cutting blades of your trimmer get blunt, it is necessary to sharpen them. Some people prefer to buy new cutting wheels, which is not rational at all.

This is interesting!All types of cutting blades must be sharpened, including those with pobedite tips. To sharpen a white diamond wheel, you need a special diamond wheel. What is the process for sharpening a tipped disc is described in detail in this material. A step-by-step description of how to sharpen a grass trimmer disc:

  • Firstly the cutting attachment must be removed from the tool. It is not safe to sharpen the tool
  • Inspect the element for professional suitability. Cracks, chips and other deformations are not allowed. If this is the case, the tool needs to be replaced
  • To sharpen the disc use tools and materials such as a sharpener, file, angle grinder. What is the best choice depends on the skill of the operator. The easiest and safest way is to use a file. To do this, the cutting tool is clamped in the jaws of the vise, and the sharpening process is performed manually at an angle of 30 degrees
  • If you use a sharpener (emery board) or angle grinder, then in this case you will need to carefully perform the sharpening. When sharpening, do not allow the metal to turn red (metal tempering will occur), otherwise it will lead to rapid wear and abrasion of the cutting part
  • Optimal option, which is recommended for beginners (it is also used by masters with experience) is the use of a file. The file can be used to sharpen the cutting edge of the tool as best as possible and accurately at an angle, which has a positive effect on the performance of the tool
  • If a milling disc with a large number of teeth is to be sharpened, an angle grinder with a fine abrasive wheel is recommended for such cases

The video below shows how to properly sharpen mower discs with a large number of teeth.

After completing the work on sharpening the grass trimmer mower disc, it remains to install it in place, and make a test of the effectiveness of the tool. After sharpening, keep in mind that it is better not to grasp the sharp parts, because you might get injured.

To summarize, it should be noted that the effectiveness of grass mowing depends on the right choice of trimmer disc. For mowing grass by the side of roads and paths, trimmer lines are used, but for fighting weeds in the countryside, as well as for making hay in the fields and wooded areas, lawn mowers with metal discs are used. If your budget allows, it is advisable to buy 3 types of metal discs and try them out for yourself to see the difference.