How to put the knife on the trimmer correctly

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..

knife, trimmer, correctly

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 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.

What knives to put on an electric and lawn mower

Before buying and putting a knife on a lawn mower, let’s 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 hitting 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.

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. D-shaped handles of lawn mowers 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.

Thus, gasoline 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.

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..

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 back the protective cover.

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

Balancing the handles

An important step in adjusting the backpack belt is also adjusting the handles to the optimum level. When the operator is holding the lawn cutter, his arms should be relaxed and his shoulders should be parallel to his body. Therefore, after adjusting the double-shoulder strap, adjust the two-handed mechanism by moving it up or down. It is necessary to achieve such a result that the hands only set the direction, and do not hold the device. If after that the trimmer balancing is disturbed again, you will have to repeat all the steps again..

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What is a backpack strap

It should be understood that the weight of a filled lawn mower is on average 6-9 kg. And this device must be kept in limbo all the time. To evenly distribute the load, the backpack strap seems to encircle the body from all sides. The main load falls on the shoulders and back, so its upper part is supplemented with wide foam inserts and fabric straps. Further, the straps are lowered along the body and, with the help of a quick-release clip, are connected to each other in the chest or abdomen area. And so that the belt does not cut into the body during load, a wide and durable lining is provided. A plastic leg guard is attached to the belt. It has a carabiner for attaching to the trimmer and spring cushioning. The ease of unfastening and fastening the lawn mowers is provided by a quick release latch located on top.

On a note! Different models of backpack belts may differ in the design of locks, carabiners, the presence or absence of additional pads and latches. However, the principle of the device and work is the same for them..

How to wear the trimmer belt correctly

Working with the trimmer is much more convenient and easier with the help of a special strap. Thanks to it, the operator can mow large areas of grass for several hours at a time without pain in joints and muscles. The double-shoulder harness is designed in such a way that the lawn mower can be held by the bindings by itself – without the help of hands. She only needs to set the direction, and she will do the rest herself. How to properly attach the belt to the trimmer and adjust it for yourself in order to lighten the load, and will be discussed in this material.

Belt adjustment

To provide yourself with comfortable working conditions, you need to be able to properly put on a backpack strap. This process requires some skill, but then, after adjusting the backpack for yourself for the first time, it will be much faster and easier to put on..

Trimmer Backpack Strap – Intended Use

Many trimmer models are equipped with a regular oblique strap. For the job, however, it is best to purchase a backpack strap that is specifically designed for lawn mowers. Thanks to its clever design, it distributes the weight of the device evenly over the entire body. Padded shoulder pads reduce weight and relieve pain in the forearms. The rigid backrest distributes the load between the upper and lower back, excluding the lower back. The shock-resistant thigh protector prevents the mower from contacting the foot, so that it does not rub or transmit vibration. In addition, the belt provides:

  • convenient transportation of the trimmer;
  • comfort during operation due to the ergonomic position of the scythe relative to the body;
  • work safety – the knapsack belt prevents the lawn mowers from slipping out of the hands when hard objects get under the knife.

Balancing the braid by moving the eyelet

After fixing the required height for yourself, you need to balance the trimmer. For this, the eyelet is rearranged, with the help of which the device is suspended from the belt, forward or backward. As a result, you need to attach the belt to the trimmer so that when you release the steering wheel, the knife or saw blade does not lie on the ground, but hangs above it without touching the surface. At what distance it will be located depends on the goals set.

Advice! A distance of 20-30 cm above the ground is suitable for mowing tall grass, and for lawns you need 5-10 cm.

Attaching the lawn mower to the belt

Depending on the model, the petrol braid can be fastened to the belt using a strap or loop. In the latter case, for balancing, you need to move it along the bar in order to get the desired result. In some cases, damping mechanisms are provided to reduce vibration and soften the sharp jumps of the trimmer.

Adjusting the shoulder straps

To distribute the load evenly over the shoulders and back, the shoulder straps need to be well adjusted. To do this, it is enough to tighten or relax the straps – they should not dig into the body or hang down. You can understand how the weight will be dispersed if you press the hook for hanging the scythe with your own hands.

How to put on the trimmer belt correctly

Basic technique

The cutting tool rotates counterclockwise, therefore, in practice, the working stroke (swing) of the braid is most often performed from right to left. The advantage of this method: the cut grass falls onto the already cut surface.

Basic technique for mowing tall grass

With very tall grass or hard weeds, it is recommended to mow in two passes: cut off the upper half of the plants with a stroke, and on the reverse. bottom. The mowed mass, in this case, lies on the left.

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Below we will show you the basic technique and some techniques with which you can learn to efficiently and quickly mow grass, even in large areas..

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How to put on the trimmer belt video

Recent comments


Trimmer belt. How to adjust the knapsack trimmer belt

Adjust the height of the hook of the backpack trimmer belt by tightening the shoulder belts so that the trimmer blade lowered to the ground is parallel to the surface of the site (strictly horizontal).
When using the trimmer saw blade, adjust the hook height (by tightening the shoulder straps) so that the trimmer saw blade is tilted slightly forward relative to the ground..

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Adjust the trimmer so that when you release the steering wheel, the trimmer knife is close to the surface of the area, but does not lie on the grass when you move the braid ear to the trimmer strap..
To cut bushes and young trees with the hedge trimmer’s saw blade, the trimmer must be balanced so that when the steering wheel is released, the machine hangs on the hook horizontally to the ground. Attach.

Adjust the trimmer shoulder straps (harness straps) so that the load is evenly distributed over the shoulders (check by pressing down on the hook of the trimmer suspension with your hand).

Husqvarna trimmer backpack video. On the design features of the belt suspension (harness) that make it easier and safer to mow with a lawn mower, trimmer, lawn mower, Husqvarna hedgecutter – wide shoulder straps and an elastic waist belt, quick-release locks (carabiners) in case of fire or any other situation requiring quick release from the trimmer. On the versatility of belts for men and women.

These Husqvarna Trimmer Backpack Belts (Balance 35/55, Balance X, Balance XT) can be used on all trimmers, lawn mowers, lawn mowers, electric mowers, brush cutters.


»How to set up correctly


  • metal perforated plate (100 mm x 240 mm)
  • 2 hacksaw blades for metal
  • 4 screws and 4 nuts M5
  • 4 washers and 4 oversized washers

From a safety point of view, hacksaw blades should not be completely hardened.

Everything you need to make a nozzle

The most difficult thing in making a nozzle is to symmetrically mark and make holes for the knives and the trimmer shaft. That is why a finished perforated plate is chosen..

DIY trimmer attachment

For many summer residents, the trimmer has long become a familiar and almost irreplaceable technique. But it is not always possible to purchase a model that meets all needs. It happens that the trimmer copes with fresh young vegetation easily, but there is a desire to clear a place behind the fence or along the access road, and the tall ripened grass turns out to be too tough for the technique..

DIY trimmer attachment

We offer the option of self-production of the trimmer head from simple (almost improvised) tools.


First you need to make the base of the nozzle. To do this, cut a square with a side of 100 mm from a metal plate of an angle grinder. You need to mark it in such a way that there is a hole exactly in the center (at the intersection of the diagonals). To do this, measure a distance of 50 mm from the center of the selected hole perpendicular to the short side of the plate and outline the cutting line for cutting.

We mark the base of the nozzle

Cut off the excess and get a square of 100 mm x 100 mm. Now you need to round off the corners a little and drill out the central hole for the trimmer shaft.

Round off the corners and drill the center hole for the trimmer shaft

We cut the canvases for metal, measuring 8 cm from each end.We get 4 blanks with ready-made holes.

We cut canvases for metal

These blanks need to be shaped like knives. To do this, we outline the cut line by eye (special accuracy is not required), fasten all 4 blanks together and grind off the excess.

Cut out knives from blanks

As a result, we get knives of the same weight and size, they can be sharpened a little on one side. Now all parts of the homemade trimmer attachment are prepared, you can start assembling.

Everything is ready for assembly

Put a small washer on the screw and insert it into the corner hole. We put on the knife from above, placing the sharpened side in the direction of rotation of the trimmer shaft. This is followed by a large washer and a nut that is not tightened so that the knife rotates freely. We attach the other 3 knives in the same way..

Fixing the knives

The end of the screw must be riveted so that the nut does not fly off..

The end of the screw must be riveted

The attachment is ready. It is installed with nuts to the ground and fixed in the same way as the three-blade knife that comes with the trimmer. When colliding with a stone, the knives fold and go inside a little.

This idea was suggested by our regular video author Tatiana (Tula region). You can see in more detail the whole process of making such a trimmer attachment and find out some of the nuances by watching the video that she prepared.

When working with a trimmer, it is important not to forget about safety, using any attachments, especially homemade ones.

We suggest discussing this idea in the comments to the publication. Share your thoughts with us, and also tell us about your good solutions.

Without accepting any of the sides of this sharp (literally and figuratively) discussion, let me show you one of the latest models of lawn mowers from the German company Robert Bosch. It provides for both a deflecting knife and an arcuate bracket, which excludes the knife “striking” on objects not intended by mowing. I show the general view of the lawn mowers and the knife itself, in two positions. General view of lawn mowers

Knife in a deflected state

Folded knife

Good evening everyone!
Exactly three years have passed since the discussion of the “acute” problem for the trimmer. Over the past 1000 days, a clear picture has emerged: “Glory to the author, the craftsman, who conducts an experiment on himself to reach the yield point of the metal from which these knives are made. He has every right to risk his own health. ” Nowadays in stunt films you can often see a frvza – “Do not try to repeat the movie stunts that were performed by professional stuntmen.” The very first article was supposed to end with approximately the same phrase: “Dear summer residents. This is my personal experiment. If you are not confident in your locksmith’s abilities, please do not repeat it. AND MOST IMPORTANT – I am not responsible for the operation of the tool, made in the footsteps of my articles.”
And the last thing. Do I see errors, judging by the photographs, of the execution of this tool. Yes, I see, and a rude one. Look closely at the plate, which is the carrier for the four knives. Look closely at the FAR RIGHT HOLE in the photo.

Alas, the author of this device does not even suspect how the hole for the shaft should be made..

I inform you that the distance from the point of the hole closest to the edge of the plate to the very edge should be NOT LESS than the diameter of the hole itself. Students of mechanics will learn this truth no later than the second year of the institute. What do we see here? A thin isthmus resembling a narrow PEREKOP, making a peninsula out of the Crimea. This is a priori the place that is weak in this design – it experiences the same loads as other knives, but the “digging” there is very thin.
Where it is thin, there and …
I would like to hope, and quite sincerely, that over these three years this isthmus has not undergone loads comparable to the yield point of this metal, but rather the alloy from which the perforated plate is stamped.

We mow under hay

It is better to mow hay not with a fishing line, but with a metal disc. The grass is cut at the root, keeping its length as much as possible.

How to use the trimmer correctly

Garden trimmers are efficient. Newbies think it’s easy to operate a lawn mower by plugging it in or adding fuel, but that’s not entirely true..

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The efficiency of the garden tool and its service life directly depend on the operating conditions. Therefore, before using the trimmer, you need to do some preparatory work..

The lawn from which you need to mow the grass is carefully examined. Glass and large stones must be removed. When flying out from under a running mower, they can injure a person. Wire is removed from the lawn, because it can wrap around a rotating element, break the mower.

After that, proceed to the installation of the cutting system. There are low power trimmers on the market that use only line. It is designed for cutting juicy and soft grass. But there are models with a capacity of more than 1 kilowatt, on which metal knives are installed. They cut off sow thistle and other hard weeds, trim young shrubs.

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In order to replace the cord with knives, you need to unscrew the fastening nut, install the cutting element. Then the nut must be returned to its place, tightened with a wrench.

The operator must take care of his own safety. Mow the grass in heavy protective clothing. Special goggles are used to protect the eyes; they will protect against dust, grass and flying debris. Hands are covered with gloves.

The electric trimmer is plugged into the network, and battery models are charged for several hours before use. Fuel is poured into a gasoline mower.

Hold the mower with the spool or knife parallel to the ground. When the tool is in the correct position, turn on the motor. Turn off the mower after the grass has been cut.

First start

Before the first start-up, the operator assembles the mower, the procedure is described in the instructions that come with the product..

If the trimmer is gasoline, it must be checked before use. The fuel tank is filled up to the neck.

The motor must run in to the fuel, so the first time it is started, it must run for a few minutes without load. Then start mowing the grass..

Running in

Before starting operation, be sure to run in gasoline mowers. The operator turns on the motor, it should run for a while at idle speed. Care must be taken that the engine does not overheat, there should be no load.

When running in lawn mowers, the load is gradually increased. If you start working at high speeds, the motor will not run in well, this will affect the further operation of the mower..

When you start it for the first time, you should not completely use up the temporary resource. After the engine runs at idle speed, you can proceed to treating the lawn. the lawn mower should run no more than 15 minutes, after which the motor is turned off, it should cool down.

If you need to run the trimmer, the braid is first assembled. Then test runs are made at least 3-5 times. If the engine is running well, proceed to mowing. At first they work no more than 5 minutes, then the duration of work is gradually increased.

Principle of operation

If we consider the principle of the trimmer, then it is similar to a hand scythe. The difference is that it is equipped with a motor, with its help the cutting element is rotated.

Manufacturing companies produce the following mower models:

  • On which a gasoline engine is installed. These garden tools have a fuel tank, this is their distinctive feature..
  • Devices with an electric motor. These tools are lighter because they do not have a fuel tank. But when choosing such models, you need to take into account that a power source is needed for their operation..

All electric streamers can be divided into battery-powered and mains-connected models. Each type has its own characteristics, but they affect the power supply unit. If you do not take it into account, then the rest of the design is similar in different devices..

If you take any trimmer model, then it consists of elements such as:

  • motor;
  • fuel tank (electric lawn mowers do not have one);
  • levers with which the mower is controlled;
  • a knife for cutting grass;
  • barbell;
  • spool with wound fishing line, which is used for cutting grass;
  • protective cover;
  • bevel gear.

The motor is placed near the mowing head and can be mounted from below or from above. The gearbox is only available on those models with a straight bar. If it is bent, then the main bearing becomes the connecting element. It consists of 2 bushings.

A fishing line is used as a cutting device. It is easy to replace it with steel knives and discs, they can be made of plastic or metal.

The choice of the cutting element depends on how hard the grass will have to be mowed. Most often, a fishing line is used in the work, it is called a cord. There are products of various shapes on sale, among buyers in demand are spiral and round.

The fishing line is wound on a spool, it is inserted into the spool, while the 2 ends of the wire remain free. When the mower engine starts to run, the bobbin rotates, the grass is cut with the free ends of the line..

How to cut your lawn to keep it smooth

In order for the lawn to be cut evenly, the mower must be lowered as low as possible during operation. The plot must be divided into squares. You need to work moving clockwise. In this case, the hay will always lie on the left without getting in the way..

How to put on a belt

If the tool has a shoulder attachment, hang it on the shoulder before starting work. The trimmer is fixed on both shoulders if it has a knapsack mount.

The bike handle model is held with 2 hands, the D-shaped handle is wrapped around the palm. The belt must be worn so that it is comfortable, then the back will not get tired.

How to refuel the gas trimmer

Gasoline lawn mowers are available with two-stroke and four-stroke engines. The first option is much more common. What are the differences between them:

  • trimmers with a 2-stroke engine have a faster response to pressing the engaging lever (for this reason, lawn mowers are mainly equipped with this type of engine);
  • a tool with a two-stroke engine will be much lighter and also easier to maintain;
  • fuel consumption of a two-stroke engine is about 30% higher than that of a 4-stroke engine with the same power;
  • 4-stroke engine is more environmentally friendly, since the fuel in it burns completely and is not emitted into the atmosphere, and its noise level is much lower;
  • and the most important distinguishing feature is the refueling: 2-stroke engine is equipped with one common tank, where gasoline mixed with oil is poured; 4-stroke has a separate gas tank and a tank for engine oil.

For refueling, you must use fresh AI-92 or AI-95 gasoline and high-quality motor oil for garden equipment (manufacturers produce different oils for 2- and 4-stroke engines). The oil can be used mineral, semi-synthetic or synthetic.

The proportion of gasoline and oil for 2-stroke trimmers can be found in the operating instructions for the particular model. Usually it is 50: 1, in some cases a ratio of 25: 1 or 40: 1 is recommended. It is necessary to prepare the fuel mixture in a separate container with exact proportions. Never pour liquids “by eye” directly into the tank without first mixing them. Detailed instructions for mixing gasoline oil, with video and descriptions, can be found on our website here.