How to change a disc on a trimmer

Why put a knife on a grass trimmer

A grass trimmer with a knife mounted on it is most convenient to use for more comfortable mowing of tall and coarse grass in the country. The fishing line on the brushcutter does not cope in such cases. Thin tears very quickly. Using 2.3mm thick cord or homemade rods with cables causes the vegetation to wrap around the spool. This increases the load on the engine. As a result, the piston group and other moving parts of the unit wear out very quickly.

If the weeds are mowed with an electric trimmer without a knife, only a fishing line, even a thick one with a curly section, will not solve the problem. There is always a risk of overheating the motor and damaging the flexible shaft. And it’s all about the large torque of the electric motor. Grass wrapped around the spindle creates a strong resistance to the shaft, which resembles a speedometer cable, which does not withstand and twists.

In order to protect the equipment from premature wear, manufacturers have provided for the possibility of installing special knives on grass trimmers. The design and shape of the existing cutting elements allows you to easily cope not only with coarse and overgrown grass, but also successfully deal with young shrub growth.

What knives to put on an electric and lawn mower

Before buying and putting a knife on the brushcutter, we will find out what they are and in what cases they are used. Today manufacturers offer the consumer a large number of types of these consumables. In general, all cutting tools designed for mowing grass can be classified:

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  • By the type of material from which it is made;
  • By the shape of its cutting blades.

The main material for the manufacture of trimmer knives can be plastic or metal. The use of such consumables largely depends on two parameters:

  • Type of brushcutters;
  • Mowing areas.

For safety reasons, manufacturers do not recommend using steel blades on electric grass trimmers. Almost all brushcutters powered by an electrical network and a battery are equipped with plastic blades. Depending on the manufacturer, they can be of a solid disc-shaped design, with several blades or in the form of a special mowing head providing for the installation of removable plastic blades.

The straight bar for the petrol grass trimmer and the curved bar for the electric

To put a metal knife on an electric grass trimmer is not allowed by its design features.

  • The curved bar of the machine reduces the distance from its working part to the mower’s feet. In the event of a collision of the blades with a stone or other solid object, the grass scythe is thrown at the feet.
  • The high torque we mentioned above, in the event of a metal blade hitting a hard object, transfers a lot of load to the grass trimmer‘s flexible shaft and motor. What causes them to fail prematurely.
  • The handle of the electric scythe most often does not have a limiting bar acting as a stop. Which does not exclude injury to the legs.

It is these features that make it possible to use exclusively plastic knives on trimmers with electric motors. When colliding with an obstacle, the blades are destroyed, thereby protecting the mower’s legs from possible injury.

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Plastic knives do a good job on overgrown and dry grass. They can mow nettles and burdock stalks.

The use of metal knives only on gasoline trimmers is also due to design features.

  • Straight bar design increases leg clearance for complete safety.
  • Comfortable U-shaped and J-shaped handles provide a firm grip. The D-shaped handles of the brushcutter are equipped with a limiter that rests on the leg of the mower, which does not allow the head to come close to the feet when the cutting disc meets a solid obstacle.
  • The clutch of the gasoline engine allows for smooth acceleration to the optimum level. And when the blade hits a hard surface, it is able to extinguish part of the impact.
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Thus, gasoline grass trimmers with a metal blade installed are best used in large areas. They will successfully cope not only with high coarse grass, weeds, burdocks and nettles, but also shrubs, as well as young trees.

The shape of the blades of the disc supplied to the grass trimmer does not in any way affect the quality of the work performed. Speed ​​does not depend on them either. Triangular, trapezoidal, rectangular shapes are all the marketing ploy of manufacturers.

If you are planning to harvest hay, it is best to use knives with a large number of blades on the brushcutter. Note discs with eight teeth or discs with four large blades and four additional blades. Two and three bladed knives will chop the grass hard.

How to put the knife on the grass trimmer

With the arrival of summer, many homeowners are worried about the question of how to put a knife on a grass trimmer. No less relevant are the questions of why and when it is advisable to replace the line on the brushcutter with a more durable cutting element. In our article we will try to disassemble all this and give useful recommendations to summer residents.

How to put a knife on the grass trimmer correctly

Putting the knife on the grass trimmer is not that difficult. The manufacturer completes its tools with a special pin that allows you to block the gearbox and a wrench with which the spool and fishing line are unscrewed. The most important thing is to observe safety precautions and the sequence of assembly and disassembly when changing cutting elements.

The algorithm for attaching the knife to the grass trimmer is as follows:

  • Remove the protective cover;
  • We block the drive. To do this, it is necessary to align two holes. in the shaft hub and in the gearbox cup. After combining them, insert a pin into the holes;
  • Unscrew the spool with line or the attachment nut holding the boot in a clockwise direction from the hub (if the grass trimmer has not been used yet);
  • Next, we install the cutting knife, so that the slots on the hub washer coincide with the recesses in the hole of the cutting disc;
  • Install the boot;
  • We tighten the fastening nut (counterclockwise) while holding the locking pin;
  • We tighten it using a tubular wrench;
  • Putting back the protective cover.

As you can see, there is nothing complicated. Now you can safely start mowing weeds on the site.

Brushcutter knives and their purpose (brushcutter knives)

  • In the manner of the material from which it is made;
  • By the shape of its cutting blades.

The main material for the production of trimmer knives you will like plastic or metal. The introduction of such consumable parts in almost everything depends on 2 characteristics:

From judgments of safety precautions, manufacturers of domestic products do not advise putting iron knives on electronic grass trimmers. All brushcutters powered by an electronic network and battery are equipped with plastic blades. Based on the manufacturer, they will be a solid disc-shaped design, with several blades or in the form of a special mowing head providing for the installation of removable plastic blades.

The straight bar for the petrol grass trimmer and the curved bar for the electronic

To put an iron knife on the electronic grass trimmer is not allowed by its design features.

  • The curved bar of the machine reduces the distance from its working part to the mower’s feet. For which the design of the collision of the blades with a stone or other hard object is intended, the grass scythe is thrown to the feet.
  • The high torque we mentioned above, for which the iron blade-hard object collision design is designed, transfers a huge load to the flexible grass trimmer shaft and engine. What causes them to break early.
  • The handle of the electric scythe in most cases does not have a limiting bar acting as a stop. Which does not exclude injury to the legs.
change, disc, trimmer

These features are used on trimmers with electronic engines only plastic knives. When colliding with an obstacle, the blades are destroyed, thereby protecting the mower’s legs from possible injuries.

Plastic knives handle well overgrown and dry grass. They understand how to mow nettles and burdock trunks.

The use of iron knives only on gasoline trimmers is also justified by design features.

  • Smooth bar design increases leg clearance for complete safety.
  • Comfortable U-shaped and J-shaped handles for a firm grip. The D-shaped handles of the brushcutter are equipped with a limiter that rests on the mower’s leg, which does not allow the head to come close to the feet when the cutting disc meets a hard obstacle.
  • The clutch of the internal combustion engine allows you to smoothly gain speed to a rational level. And when the blade hits a hard surface, it is able to absorb part of the impact.
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Thus, petrol grass trimmers with an installed iron blade are ideal for use on large areas. They will successfully cope not only with the highest coarse grass, weeds, burdocks and nettles, but also with shrubs and young trees.

The shape of the disc blades on the grass trimmer does not affect the quality of the work performed. Speed ​​does not depend on their condition either. Triangular, trapezoidal, rectangular shapes, this is our client’s pre-sale preparation of manufacturers.

If you intend to prepare hay, then the best way is to put knives with a huge number of blades on the brushcutter. Carefully examine the discs with eight teeth, in other words, discs with 4 large blades and 4 additional ones. 2 and 3 bladed knives will crush the grass very much.

Putting the knife on the grass trimmer is not that difficult. The manufacturer completes its tools with a special pin that allows you to lock the gearbox and a wrench, using which the spool and fishing line are unscrewed. The main thing to observe when changing cutting parts is safety precautions and the sequence of assembly and disassembly.

How To Place The Disc On Your Lawn Mower Correctly

With the arrival of summer, many owners of personal plots are worried about the question, knitted for the purpose of how to put a knife on a grass trimmer. pressing are the questions of why and when it is purposeful to replace the line on the brushcutter with a stronger cutting element. In our article we will try to disassemble this and give useful advice to summer residents.

A grass trimmer with a knife installed at this address is most convenient to use for more comfortable mowing of the highest and hardened grass in the country. The fishing line on the brushcutter does not cope with this option. A narrow one breaks in a short time. The introduction of a thick 4.5.3 mm cord or homemade rods with cables forces the vegetation to wrap around the spool. This increases the load on the engine. For this reason, the piston group and the rest of the moving parts of the unit wear out in a short time.

If you create a weeds mowing with an electronic trimmer without a knife, only a fishing line, even a thick one with a curly section, will not solve the problem. There is always a risk of overheating the motor and damaging the flexible shaft. And the matter to our client remains in the great torque of the electronic motor. The grass wound on the spindle makes a strong resistance to the shaft, which resembles a speedometer cable, which does not withstand and twists.

In order to protect the equipment from early wear, domestic manufacturers have provided for the possibility of installing special knives on grass trimmers. The design and shape of the existing cutting parts allows you to easily handle not only coarse and overgrown grass, but also successfully fight young shrub growth.

Before taking and putting a knife on the brushcutter, we will find out what they are and where they are used. Now domestic manufacturers offer the consumer many types of these consumables. The entire cutting tool created for mowing grass, of course, is systematized:

The brushcutter knife does not mow even with sharpening. fix

The method of attaching the blade to the grass trimmer is as follows:

  • Remove the protective cover;
  • We block the drive. For this purpose, you need to match two holes. in the shaft hub and in the gear cup. After combining them, insert a pin into the holes;
  • We unscrew the spool with a fishing line or the fastening nut holding the boot in a clockwise direction from the hub (if the grass trimmer has not yet been used);
  • Next, we install the cutting knife, so that the slots on the hub washer coincide with the recesses in the hole of the cutting disc;
  • Install the boot;
  • We tighten the fastening nut (counterclockwise) while holding the locking pin;
  • We tighten it using a tubular wrench;
  • We return the protective cover to the destination.

As you can see, there are no difficulties. Now there is an option to boldly start mowing weeds in this area.

Which shape to choose?

It is not worth buying a grass trimmer knife of the original shape. Often this is just a marketing ploy aimed at increasing sales, and not at all a necessity. The shape as well as the number of blades can be important for specific tasks such as making hay. If you want to deal with an area completely overgrown with weeds, and from the equipment only a light and not too powerful grass trimmer, then perforated knives made of hardened steel will help out.

What to do if the disc is broken?

Since changing disks will not pose any problem, you can do it at home, independently and quickly enough. All you have to do is follow the simple instructions. If you are changing your head outdoors, spread out a piece of tarp or an old bedspread. This is in order to easily see a small tool or nut if you suddenly drop it.

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Consider the teeth separately

These types of blades have sharpened teeth around the perimeter of the blade. All of them are round in shape with a different number of teeth around the perimeter. These teeth can be part of the blade and have a curved offset for blade clearance, or have chain saw blades or riveted to the disc. Most of them today have tungsten tips.

Such discs are more efficient in cutting, since the cutting edge is around the outer surface, that is, the actual contact with the material being cut is greater. This is useful when dealing with old, lignified weeds. But there are also disadvantages. They are generally more expensive due to their more complex shape and require additional machining to bend, sharpen, or attach additional parts. Since the cutting edge is on the tip, it is subject to more impact and wear.

What grass trimmer discs are there and right for you

Garden grass trimmers have completely replaced most other devices. They allow you to level the overgrown lawn, put in order the flower beds and paths. Most often, a grass trimmer with a fishing line is used for domestic needs. Line trimmer heads are now available for almost all models and are very common and relatively inexpensive. But when mowing tall grass, it is wound around the spindle, which greatly complicates the work process and accelerates tool wear. Therefore, experienced gardeners choose grass trimmer discs. To decide which discs are right for you, you should evaluate the nature and duration of the work ahead.

The choice is great today. Large and small, plastic and metal, made in various variations, they are ready to perform a wide variety of tasks and save the garden from invading weeds. Of course, plastic are disposable, but they can be a convenient option for work in which high strength is not required.

If you are using a telescopic grass trimmer, only use plastic knives or fishing line. This requirement is due to safety regulations. A metal disc on a grass trimmer shows itself much better in work, that is, a metal head with a variable number of blades. They will cope with thickets of old weeds.

Cutting ability

Most of these blades are extremely good at horizontal cutting. Usually any vegetation with a diameter of 50 to 60 millimeters is cut. When using a blade with multiple teeth, keep in mind that they require a lot more power and torque to move and are therefore more suited to powerful machines.

In many reviews, you will read that the more tines, the better, that in this case the grass trimmer will cope with any task. But if you want to get the most out of power and speed, then the opposite rule works. The fewer the teeth, the better.

Round or square blades

It is important to understand that when cutting the grass, only the sharp edge of the blade is involved. Therefore, the grass trimmer discs must be selected based on the volume of work. If you have to work with thickets of coarse weeds, then the maximum cutting surface is required, then the weeds will not wrap around the gearbox and the work will go faster.

Different blades work better for different types of vegetation, so it makes sense to have several options and change them as needed. Again, rectangular and star-shaped blades are best for mulching as these have the largest area. rounded shape with much shorter blades is practically useless when mulching.

Star discs

These types of blades have a sharpened knife edge. Today it is the most common type of metal blade and is often supplied as standard. If you need to change the disc on the trimmer, then you should pay attention to this particular group. There are an almost infinite number of knife blade shapes, but what they have in common is that they are usually stamped from thin sheets of steel.

The most common is the star shape with three or four cutting edges. They are relatively cheap and work well for cutting grass, but quickly lose their effectiveness as the edge of the blade becomes dull.