How to attach the cutting blade to the trimmer

Manufacturers overview

There are a lot of manufacturers of lawn mower discs. It is worth familiarizing yourself with the most popular among them. For example, the Bosch brand is known for its knives with two and three blades. The peculiarity of the knives of this company is that each of the blades can be replaced separately from the others.

Another firm known for its bladed knives is Shark. The advantage of the design is that the blades are fixed relative to each other at an angle of 120 degrees. As a result, it is easy to adjust each of the blades, which is convenient for different types of vegetation. Another feature of knives from this manufacturer is their low weight.

Husqvarna is also known for its multi-tooth knives, especially the hay knives. Ideal for dense and dense grass. Of the minuses, it is worth noting the large weight of the discs and the fact that you cannot turn the knife over if one side of it is sharpened.

Inforce knives do a good job with undergrowth and branches. In practice, the metal from which the cutting elements are made shows itself to be very durable. The only thing is that in some models the victorious soldering is erased very quickly.

The discs cope equally well with different types of grass, as well as with shrubs and trees.

Rezer discs are excellent at mowing grass, weeds, branches. The teeth can withstand well even cutting down trees with a thickness of 6 centimeters or more. However, they have a drawback in the form of winding grass on a shaft.

Patriot produces quality knives. Users note that if you choose the right disk for a specific job, then it will serve for a long time and amaze with its performance. Knives from this manufacturer are very easy to sharpen yourself.

How to choose?

When choosing a knife for a mower, there are many points to pay attention to. For example, metal toothed discs are most often circular in shape. Teeth can differ in shape, appearance, size. For small trees and dense grass, it is better to give preference to discs with a large number of teeth.

It is worth noting such an advantage of milling discs for lawn mowers, as a quick set of revolutions. However, a high moment of inertia does not have the best effect on the machine drive. For dense mowing, for high, as well as for small coarse grass and bushes, it is better to choose circles with 40 or more teeth and perforation. They are able not to chop up vegetation, and at the same time it will practically not wrap around a circle. If the number of teeth is more than 60, then you can safely mow grass and trees with a trunk thickness of up to 7 cm.

Solid discs and discs without holes are very heavy, so they should be chosen for powerful trimmers (over 40 cm3). At the same time, they are convenient for mowing rare grass, dead wood, they are also suitable for mowing with different densities.

Victory-tipped discs should be chosen for mowing plants near obstacles. If you need to mow grass for hay, then steel knives with a large number of teeth with an even sharpening should be preferred. Solid discs with 16 to 32 teeth cut well thick-stemmed plants.

For low power trimmers, paddle discs with a minimum moment of inertia are better suited. The fewer the blades, the more the tool will chop the grass. Thus, discs with two blades are most often used for mowing uniform grass. The main advantage of this species is that it throws cut plants to the side.

When harvesting hay, it is recommended to choose knives with four blades so that the grass is not chopped up.

The thickness of the blades is also important when choosing. Discs can be stamped or forged. The former are distinguished by a low price, but at the same time they can be severely damaged when faced with an obstacle. As for forged discs, they do not chip and cut when colliding with hard objects.

For electric trimmers, choose only plastic blades. Their low weight will not put unnecessary stress on the engine. Soft plastic allows the knives to not break when facing an obstacle, but simply bend or deform slightly. It is recommended to use such cutting elements for cutting thick soft grass.

How to sharpen and deliver?

a lawn mower with constant use will sooner or later begin to need regular maintenance. One of the important points is the timely sharpening of knives. The metal disc can, of course, work in a dull state, but it cannot be used. This leads to a decrease in performance, overheating of the engine, and wear of the gearbox. Sharpening the teeth or blades is a snap, but if you want, you can simply install new knives.

  • First of all, the knife is removed from the device. Sharpening directly on the mower is not recommended as it is unsafe.
  • Next, you need to inspect the cutting element for chips, cracks, damage. If they are, then you will need to install a new disk.
  • You can sharpen your knives with a file, sharpener or angle grinder. The safest tool is a file that even a beginner can handle. For sharpening, the knife is placed in a vice, and then manually processed at an angle of 30 degrees. This method is considered the highest quality.

When using an angle grinder, it is important not to overheat the metal, otherwise the disc will quickly become unusable. angle grinder with a fine abrasive wheel is suitable for sharpening discs with many teeth.

  • At the end of sharpening, the blade can be reattached to the trimmer and check how efficiently the tool is working. Do not handle the sharp parts of the knife to avoid injury.

Over time, the knife will wear out and should be replaced. Fitting a new disc to the trimmer is a snap. This procedure takes no more than 5 minutes of time, if you follow simple instructions.

  • First you need to remove the protective cover, but on some models it may remain. For example, metal covers cannot be removed from the lawn mower.
  • Next, you should take a key with six faces (hexagon) and use it to block the gearbox. The hole for blocking must be looked for from the side or from the end.
  • After that, the mowing head must be unscrewed from the lawn mowers.
  • Then a disc will be installed in its place. It should be noted that the inner diameter of the knife must be completely located in the groove reserved for this. The face of the nozzle should be with the letters facing up.
  • Now you need to fix the disk with a special washer and screw the fastening nut counterclockwise. Before doing this, it is necessary to block the gearbox shaft.
  • The last step is to install a protective plastic casing.

By material

The lawn mower disc can be made of metal or plastic. It should be clarified that plastic blades should be preferred for electric lawn mowers. They fit perfectly with the curved shaft of this tool, which doesn’t separate too much between the work area and the mower’s legs. Plastic knives are good at mowing overgrown dry grass, for example, nettle or burdock trunks.

The metal knives are only suitable for the petrol trimmer. This is due to the flat bar that moves the disc away from the feet to a safe distance. Special shaped handles also contribute to safety. When hitting a hard object, part of the impact is absorbed by the engine clutch. Iron knives are suitable for mowing grass from large areas, weeds, bushes, young trees.

Species overview

For lawn mowers, preference should be given to special knives. They allow you to cut taller, tougher grass than line. In addition, the knife is suitable even for pruning young bushes.

There are many types of discs that differ in the cutting edge, shape and material from which they are made.

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Each species has its own characteristics.

Lawn mower discs: what are they, how to select and install?

  • Species overview
  • Manufacturers overview
  • How to choose?
  • How to sharpen and deliver?
  • How to properly mow the grass?

Lawn mower knives are irreplaceable. It is enough to choose the right one, and you can use them to mow huge areas of grass. Of course, the variety of knives complicates the task of selecting them somewhat. To understand which cutting element is needed, you need to familiarize yourself with the main ones. You should also find out in advance about the correct sharpening and operation of knives.

By form

By shape, knives with disc blades and several blades are distinguished, which are at a certain distance from each other. The shape of the blades may also vary. It should be noted that this does not affect either the speed or the quality of the lawnmower’s work.

Currently, manufacturers began to offer, in addition to traditional shapes, also triangular, rectangular and trapezoidal.

By making cutting edges

  • with two tines. for young soft grass, lawns;
  • with three teeth. for young grass, dead wood, weeds;
  • with four tines. for tough grass and young tree shoots;
  • with eight teeth, mows grass without too much chopping;
  • with 24 teeth. for hard and dry grass, shrubs, thin trees;
  • with 40 or more teeth. for mowing any grass, bushes, trees;
  • 80 and more. for professional lawn mowers.


  • with two. for soft and low braids;
  • with three. for mowing weeds;
  • with four or more. for mowing grass for hay.

How to put the knife on the trimmer

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

What knives to put on an electric and lawn mower

Before buying and putting a knife on a lawn mower, 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:

  • 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:

  • Lawn mowers type;
  • Mowing areas.

For safety reasons, manufacturers do not recommend putting steel knives on electric trimmers. Almost all electric and battery powered lawn mowers 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.

Straight bar for petrol trimmer and curved for electric

To put a metal knife on an electric 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 scythe is thrown to the feet.
  • The high torque we mentioned above, in the event of a metal blade hitting a hard object, transfers a large load to the trimmer flex shaft and its 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.

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

  • Straight bar design increases leg clearance for complete safety.
  • Comfortable U-shaped and J-shaped handles provide a firm grip. D-shaped handles of lawn mowers are equipped with a stopper 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 absorb part of the impact.

Thus, petrol 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 disc blades supplied to the trimmer in no way affects 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 plan on making hay, it is best to use knives with a large number of blades on the mower. Note the discs with eight teeth, or discs with four large blades and four additional blades. Two and three bladed knives will chop the grass hard.

Why you need to put the knife on the trimmer

A 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 line on the lawn mower in such cases does not cope. 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 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 the 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.

How to put a knife on the trimmer correctly

Putting the knife on the 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 setting the knife to the 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;
  • We unscrew the spool with line or the fastening nut holding the boot (if the trimmer has not been used yet) from the hub clockwise;
  • 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 the protective cover back in place.

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

Grinding head made of an anchor from the engine

attach, cutting, blade, trimmer

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Saw blade selection

We choose a TST series diamond blade designed for working with wood and plywood, with the following main characteristics:

    outer diameter at the tops of the teeth. 216 mm;

bore hole. 30 mm;

  • number of teeth. 48.
  • The set includes three rings with the same outer (30 mm), but different inner diameters, that is, they differ from each other in width. These rings are designed to compensate for the difference between the bore of the saw blade and the counterpart on the larger diameter pressure washer.

    How to attach a saw blade to a trimmer

    The main working bodies of any trimmer are a line spool or a special disc (plastic or metal). A plastic knife, like a fishing line, can mow green grassy plants, with a metal knife. dry grass, reeds and even shrubs. Is it possible to increase the functionality of the trimmer by installing a saw blade on it?

    Test in practice

    For safety, you must wear a protective helmet with a transparent visor to protect your face, gloves on your hands.

    First, we try to remove thin dry branches, gradually moving to larger ones, and finish testing by cutting dry and semi-dry tree trunks with a diameter of 7-8 cm.

    Make sure the diamond blade trimmer works efficiently, reliably and safely. Slices, both transverse and oblique, are very smooth. They do not show crumpled and torn wood fibers.

    Mowing grass with a diamond blade is also quite comfortable, efficient and productive, regardless of its height, density and degree of dryness.

    So, a trimmer with a saw blade not only perfectly performs its direct functions (mowing grass), but also expands the scope (removing twigs and branches from trees, and cutting thin trunks).

    Attention! Do not get carried away with installing saw blades of large diameter and thickness on the trimmer, as this will cause an increase in the load on the gearbox and motor, and possible premature failure. Also, the safety of work with such a tool will decrease, which should not be allowed in any case.

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    Fitting a diamond blade

    This operation outwardly does not differ from the fastening of a typical disk, except that even more attention, accuracy and thorough control is required.

    We remove the spool with the fishing line, blocking the gearbox shaft with a special pin or a screwdriver of a suitable diameter, rotating the fishing line container counterclockwise.

    We measure the diamond disc to the lower spline washer and make sure that its bore is larger than the diameter of the seating collar on the washer. At high speeds, the saw blade may move, imbalance may occur, which will inevitably lead to tool breakage and even injury to the operator or people nearby.

    We try on the compensating washers alternately and choose the one that fits the width and completely selects the gap between the saw blade seat and the centering shoulder of the lower washer.

    We install alternately on the gearbox shaft the lower washer with a compensation ring, a diamond disc, an upper washer and a protective cup, which still partially redistributes the clamping force over a large area.

    We tighten the entire resulting package on the gearbox shaft with a nut with a left-hand thread, first by hand, and then with a socket wrench, blocking the gearbox shaft from below using a suitable screwdriver.

    We remove the protective split plastic tube from the teeth and once again check the strength of the saw blade fastening to the gearbox shaft. If it turned out to be reliable, then the trimmer, with the installed diamond disc, is completely ready, both for traditional and not intended for this tool, work.

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    • Full metal forged shaft extends trimmer life

    Cutting element: line / knife / disc

    Mowing width: 42 / 25.5 cm

    Engine cycle: two-stroke

    Power (kW): 1.86

    • Easy Start system and primer for priming fuel. easy engine start

    Cutting element: line / knife

    Mowing width: 44 / 25.5 cm

    Engine cycle: two-stroke

    Power (kW): 1.8

    • Battery included. you can start working right away!

    Mowing width: 25 cm

    Cutting element: plastic knife

    Battery type: Li-lon

    Battery capacity: 2.0 Ah

    attach, cutting, blade, trimmer
    • Work with confidence. the power cord retainer keeps it plugged in

    Cutting element: fishing line

    Mowing width: 25 cm

    Power (kW): 0.4

    Cutting element: fishing line

    Mowing width: 25 cm

    Power (kW): 0.29

    Cutting element: fishing line

    Mowing width: 23 cm

    Power (kW): 0.28

    • Overhead motor for balance and comfort during work

    Cutting element: line / knife

    Mowing width: 38/26 cm

    Power (kW): 1.2

    Cutting element: fishing line

    Mowing width: 30 cm

    Power (kW): 0.5

    • EasyEdge function for trimming the lawn edge

    Cutting element: fishing line

    Mowing width: 30 cm

    Power (kW): 0.6

    • Save time and effort with the EasyStart electric start system

    Cutting element: line / knife / disc

    Mowing width: 43/26 cm

    Engine cycle: two-stroke

    Power (kW): 1.4

    • Translucent fuel tank for easy tracking of fuel consumption

    Cutting element: line / knife

    Mowing width: 25.5 cm

    Engine cycle: two-stroke

    Power (kW): 2.5

    Cutting element: line / knife

    Mowing width: 44 / 25.5 cm

    Engine cycle: two-stroke

    Power (kW): 2.2

    • Universal application: can be operated from battery or mains

    Mowing width: 25-30 cm

    Cutting element: fishing line

    Battery type: Li-lon / Ni-Cd

    Battery capacity: 2.0 Ah

    • Unique ONE EasyStart electric start system, works with knife and line

    Cutting element: line / knife

    Mowing width: 46/26 cm

    Engine cycle: two-stroke

    Power (kW): 0.95

    • Vibration damping system to reduce long-term fatigue

    Cutting element: line / knife

    How to Attach Brush Cutter Blades to your EGO Trimmer

    Mowing width: 25.5 cm

    Engine cycle: two-stroke

    Power (kW): 2.5

    • Lawn edge trim function

    Cutting element: fishing line

    Mowing width: 25 cm

    Power (kW): 0.35

    • Lightest 4-stroke trimmer in the manufacturer’s range

    Cutting element: line / knife

    Mowing width: 46/26 cm

    Engine cycle: four-stroke

    Power (kW): 0.75

    • Combined safety guard for easy handling of the knife or trimmer head

    Cutting element: line / knife

    Mowing width: 27.5 / 48 cm

    Engine cycle: two-stroke

    Power (kW): 1.5

    • Easy transition to edge trim mode

    Mowing width: 25 cm

    Cutting element: fishing line

    Battery type: Li-lon

    • Spool Reel-Easy. minimum time to wind the line

    Cutting element: line / knife

    Mowing width: 46/26 cm

    Engine cycle: two-stroke

    Power (kW): 0.95

    The garden trimmer is a mobile hand-held tool for cutting grass. It is enough to put in order the entire territory of the summer cottage, but where there is a lawn mower, it is necessary for cutting grass in hard-to-reach places, near trees, bushes, hedges. Lightweight and compact trimmers do more than just tackle tall grass, some models can cut even small shrubs.

    How to attach a blade to you Brush cutter attachment

    Garden trimmer device

    The cutting part is made in the form of a fishing line, less often knives or a disk attached to a drum. The top of the drum is covered with a casing. The fishing line is a consumable item. The cutting part is supported by a rod, the length of which can be adjusted. The bar has a handle, a shoulder strap. The main differences between different models relate to the engine design.

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    engine’s type

    Electrical. lightweight and easy to operate, not noisy. Varieties:

    • Engine at the bottom. easy to use, small in size, power up to 650 W.
    • Motor at the top. power about 1 kW, can be with knives or replaceable attachments.

    Gasoline. for large areas, since they are independent of the cable. Powerful for all types of vegetation, even shrubs. Engine:

    • Two-stroke. you need to prepare a mixture of gasoline and oil.
    • Four-stroke. gasoline and oil are filled separately.

    How to install a disc on a trimmer

    Attaching the blade to the trimmer is very simple. For this, a complete wrench is used to disconnect the cutting attachment and a pin that locks the gearbox. The procedure is as follows.

    • First of all, the electric trimmer should be disconnected from the network, the petrol trimmer should be simply turned off. Disconnect the protective cover and move to the side.
    • Next, you need to align the holes on the gearbox and the shaft in order to insert a pin into them and block the drive.
    • If a spool with line was used, it must be unscrewed clockwise.
    • Then you need to find a nut to twist the knife.
    • The next step is to install the knives. Trimmer owners often wonder which side to put the disc on. This must be done so that the marking with numbers and letters is on top.
    • Then you need to put the boot on top, and above it. the fixing nut, which must be tightened tightly with a wrench.
    • The last step is to install the protective cover.

    As you can see, the procedure is very simple and the same for many brands, be it Stihl or Husqvarna equipment.

    On a note! If the owner of the device wants to replace the disc back on the line, you can install the reel with it in the same way.

    Rules for replacing knives on the grass trimmer

    If the trimmer disc is used regularly, it will need to be removed from time to time and sharpened or replaced with a new one. 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, be it Carver or Huter, but slight differences are possible. It is quite simple to change the knife on the trimmer if you follow the safety precautions and know the correct procedure, the description of which can be found in the user manual. The whole process of replacing step by step, as well as the method of self-sharpening knives, will be described in this material.


    It is not recommended to put metal knives on electric scythes, since the design features make their use dangerous for the user. This is due to the curved shape of the rod, the absence of stops on the handles, as well as the high rotation speed.

    Important! The straight bar ensures safe use of the trimmer when the disc is spinning and bumping into an obstacle. In this situation, it bounces back towards the person, so the curved structure can cause injury.

    Plastic knives should be used on gooseneck trimmers for safety reasons. Their purpose is mowing soft grasses, dead wood. Whereas metal discs do an excellent job with tall, dense, hard shoots, bushes, as well as tree shoots.

    Disc sharpening

    Regardless of the quality of the disc, over time it becomes dull and begins to chop grass poorly. If the knives are still relatively new, and replacement is impractical, you can sharpen them yourself.

    Important! For sharpening, only those discs that are not soldered from hard materials are suitable. Such parts are thrown away, and new ones are acquired instead.

    To sharpen discs, you must:

    • disassemble the trimmer, remove the knives;
    • carefully inspect the disc. if cracks are found, it is better to replace the part with a new one, since its further operation is unsafe;
    • bent blades can be gently bent with a hammer;
    • given the size of the disc, you need to choose the right file for metal, this will ensure more convenient work;
    • sharpen all upper cutting edges of the discs at an angle of 30 °;
    • reassemble the trimmer in reverse order.

    To sharpen the disc, you can use an emery machine at low speeds with a medium grit grinding wheel. With such a tool, the process will move much faster. For safety, you need to wear gloves on your hands, and a protective mask or goggles on your face.

    So, for mowing grass on gasoline and trimmers, plastic and metal discs of various shapes and with a different set of blades are used. They are selected in accordance with the type of work performed and the size of the cultivated area. If the blades on the mower are dull, it is easy to sharpen them or change them yourself. Despite the simplicity of the procedure, you need to be careful and remember about safety, so as not to injure yourself through negligence or damage the equipment. A more detailed description of replacing the knives in relation to a specific trimmer model can be found in the operating instructions or on the manufacturer’s official website. For clarity, the general scheme of the process is shown in the video.


    The number of blades is important when solving diverse tasks. So, to grind the grass, two or three pieces are enough. To harvest hay, it is necessary that there are four to eight blades on the disc. To destroy small shoots of trees and shrubs, instead of blades on the disks, there should be a large number of small teeth.

    When is the use of knives relevant?

    When using lawn mowers in summer cottages, the fishing line is the most popular attachment. It has a low price, is suitable for different trim heads, and is 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 will kick in immediately, regardless of whether a petrol or electric trimmer is used. In addition, vegetation is wound around the spindle, which creates significant resistance on the shaft and leads to its breakage. It can also cause piston system failure in lawn mowers or engine burnout in trimmers.

    Therefore, for mowing tall or hard vegetation, various attachments are used. So, for harvesting high and coarse 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 wear resistance of the equipment.

    On a note! Due to the fact that the engine of trimmers and battery models is less powerful than on lawn mowers, therefore the use of discs is more relevant for gasoline mowers.

    Disk selection criteria

    It is necessary to choose a plastic or metal knife, taking into account the area of ​​the site that is planned to be processed, as well as the type of trimmer. electric or gasoline. The number of blades will depend on which growth needs to be removed with the tool. You can choose the desired disc shape, the number of blades and the material of manufacture using the instructions for use of the device. Usually it prescribes which cutters are recommended to be used for solving certain tasks.