Do-it-yourself repair of lawn mowers: faults and their elimination. Do-it-yourself trimmer repair: analysis of faults and methods for eliminating them Self-repair of a trimmer

At first glance, a simple device for mowing grass using a two-stroke engine has fine tuning. Repairing a lawn mower should be entrusted to a specialist or you should study the equipment yourself using the instruction manual. Maintenance Braids need to be maintained. Lubricating the gearbox, replacing the fishing line, and sharpening the teeth can be done on your own.

Petrol mower malfunctions and how to fix them

Any type has a hollow rod in which a connecting cable is placed between the motor shaft and the lower gearbox, which transmits rotation to the working element with cutting tool. At the top there is a carburetor and motor, at the bottom there is a gearbox and a working tool covered with a casing. In the middle part there is a transverse handle in which control buttons are located. To unload the hands, there is an unloading belt that holds the bar with the operator’s torso.

When choosing a lawn mower, it is preferable to have a device with a two-stroke engine rather than a four-stroke one. A two-stroke engine is more maneuverable and easier to repair. With a four-stroke unit, the vibration level is lower.

They follow this, repairing a lawn mower consists of troubleshooting;

the engine does not start;
the cutting mechanism does not gain momentum;
the engine stalls;
the gearbox gets hot;
an extraneous knock is heard, strong vibration of the rod.

Before troubleshooting, you need to diagnose and identify the non-working unit.

It is important to know the lubrication points of the tool. Regular care and cleaning of the device after use will extend its service life. Before work, you need to tighten the mounting bolts, prepare fuel and fill the tank.

Chainsaw engine does not start

If the mechanism does not start, it stalls immediately, check sequentially:

is there fuel in the tank;
serviceability of the spark plug;
cleanliness of the air and fuel filter;
cleanliness of the breather and exhaust channel.

It is necessary to refill with a freshly prepared mixture based on AI-92; the oil is injected for precise dosage with a medical syringe. This will help avoid expensive chainsaw repairs.

You need to make sure that the spark plug is working and produces a spark when it comes into contact with the body. In this case, it is necessary to dry the spark plug channel, clean and dry the part itself. You can change the candle, but the channel still needs to be dried for 40 minutes. Check the serviceability of the high-voltage wire; there may not always be contact. A malfunction in the ignition unit when repairing a lawn mower cannot be repaired with your own hands.

If the engine does not stall when the air filter is removed, this is the reason - replacement or cleaning is required. The fuel filter is replaced with great care. After checking the cleanliness of the breather, remove the muffler mesh and clean the exhaust channel.

The next step will be where you have to find the fault and fix it, taking into account the tiny size of the parts. If the simplest operations do not bring results, in order not to disrupt the fine tuning of the system, it is better to entrust the repair to a specialist. Where to start diagnosing and how to properly repair a lawn mower with your own hands, watch the video:

Repair and lubrication of the lawn mower gearbox

The role of the gearbox is to transmit torque from the motor shaft to the cutting tool through 2 toothed gears with different numbers of teeth. Torque is transmitted at an angle of 30 0. The speed of the lower cutting disk is 1.4 times less than the engine speed. Gears must be clean and lubricated. There is a hole under the screw on top to supply oil to the teeth.

The lawnmower gearbox is lubricated at least once a season. If the work is intensive or there is extraneous noise in bottom node, needs to be lubricated more often.

First, you should clear the area where the plug covers the hole from soil and grass. Unscrew the plug with the appropriate tool, it is included with the saw. We use grease from a tube. You choose either a native lubricant from the manufacturer, or well-known high-quality compounds, such as Oleo-Mas, Litol-24, Azmol 158. Open the protective layer of the tube and lay the instrument on its side. Slowly rotating the knife, squeeze the lubricant into the gear housing. The gears, turning, spread the composition with teeth over the entire surface. You can also add lubricant using a special syringe.

Lack or large number lubricants can cause the gearbox to heat up. An audible knock and play indicate the destruction of the bearing or the ingress of dirt due to damage to the anthers. Bearings must be replaced using a puller, without using the heating method.

If the gearbox wobbles and moves along the rod, it is necessary to replace the housing, or temporarily tighten the assembly with a clamp to secure it to the pipe. If the knife stops rotating, it means that the gears are not engaging - the teeth have become worn out or chipped. The pair will need to be replaced with complete disassembly of the unit.

Disassembly of the gearbox with removal of the shaft and bearing units cannot be carried out using heat. When heated, the metal loses its strength qualities and subsequently the unit becomes unreliable. To remove bearings, use a puller.

When replacing a gearbox, it is necessary to select a new unit, guided by:

pipe diameter;
drive shaft diameter;
drive shaft cross section;
method of securing protection

Caring for cutting units of lawn mowers

The saw set becomes dull or wears out over time. Working with the tool becomes stressful, the load increases, and the quality of the swath deteriorates. Metal saw blades are sharpened, plastic ones are replaced.

If the cutting tool is a fishing line, it gradually wears out, and a new material. The principle of operation of a cutter with a fishing line is the gradual unwinding of the reel under the influence of centrifugal force. When in contact with grass, the fishing line wears out and is fed out of the reel gradually. Special winding is needed so that two cutting elements come out at the same time and do not get confused with each other.

The picture shows how to properly wind the fishing line onto a reel. Before winding a new fishing line you need to:

Having unscrewed the nozzle, carefully remove the cover, holding the spring with your hand;
remove pieces of old fishing line from the reel;
measure 5 meters of new string and fold it in half;
there are guides in the reel for 2 ends, hook the middle part to the notch and wind in the direction of the arrows for each half of the string;
pass the remaining 20 cm through special recesses at opposite ends of the coil;
install the spring and washers, bring the ends of the fishing line out, close the drum with a lid.

To better understand how to change the fishing line on a lawn mower, watch the video.

Replacing fishing line in the trimmer head of a lawn mower - video

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A gas mower (trimmer, walk-behind mower or lawn mower) is extremely important tool in the summer, both for owners of private residential buildings and for those who like to grow their own vegetables, berries and fruits in the country. Destroy weeds or trim the lawn - all this can be done with ease by a trimmer. And much faster than if you use other methods.

Unfortunately, like any other technical device, a brush cutter sometimes breaks down. For example, the engine does not work or There are problems with the carburetor or starter, even if you periodically service the unit: change the cutting line or teeth, fill it only with high-quality fuel and oil, and also constantly lubricate the gas trimmer gearbox. In order not to pay for repairs, which can cost you a pretty penny, you can study the structure of the brush cutter and carry out the repair yourself.

Trimmer device

Typical scheme, according to which manufacturers make their lawn mowers:

Typical faults

The most frequent breakdowns arising during operation of the unit are:

the engine does not work, the trimmer does not start;
the engine manages to start, after which it does not maintain speed and stalls abruptly and for no reason;
The mower bar vibrates strongly;
the gearbox overheats greatly;
low speed of the cutting line.

Before you begin repairs, read the instructions, which must be included in the kit, so that correctly diagnose.

Motor check and repair

If the engine of the device does not start, you need to check the presence of gasoline in the tank of the lawn mower. Keep in mind when you refuel your device with a specially prepared mixture of oil and gasoline, the fuel must be at least grade AI-92. To avoid engine damage, a certain amount of oil is added to the pre-calculated volume of gasoline using a syringe. Having made sure that the problem is not a lack of gasoline, we move on to checking the functionality of the ignition unit.

Troubleshooting the ignition unit we start with a candle. To check if it works, just unscrew it, bring it to the body and try to start the engine. If everything is fine with the candle in perfect order, you will see a spark flash between the trimmer body and the spark plug.

Another source of trouble is that the mixture of oil and gasoline floods the channel into which the spark plug is screwed. Try drying the channel, and also drying and cleaning the spark plug itself. You need to leave the device to dry for about one hour, then screw the spark plug back in and try to start the engine. If fuel constantly floods the spark plugs, you are unlikely to fix this kind of problem yourself, so you will need to contact a qualified specialist.

If you have determined that the source of the problem does not lie in the ignition unit, it is time to check condition of unit filters, fuel and air. The air filter will need to be replaced with a new one if, after removing the old filter, you find that the engine starts easily without it. To make sure the fuel filter is working, do the following:

disconnect the hose from the filter outlet;
try to start the engine;
if the fuel mixture begins to flow out of the filter hole, then everything is fine with it; otherwise, replace the filter.

The final reasons for the engine not starting may be a clogged breather or muffler. You should make sure they are clean. If not, clean the exhaust port or breather.

Carburetor adjustment

The carburetor is a rather complex element of a lawn mower, which should not be repaired by an untrained person on their own, with the exception of performing some simple operations, for example, cleaning the internal surface of the product from dirt without completely disassembling it. Adjusting the carburetor trimmer It is better to entrust it to specially trained people who will be able to carry out the finest adjustments without disturbing its normal performance.

Gearbox care and repair

The role of the gearbox in the trimmer is that it is an intermediary between the engine and the cutting line, transmitting torque from the motor to bottom part unit through two gears with teeth.

To prevent wear of gears in the gearbox and their premature failure, it is necessary to carefully ensure that they are constantly lubricated. Most manufacturers indicate in the instructions supplied with their lawn mowers that the gearbox must be filled with oil at least once a season. If you often work a lot with the trimmer or have heard unpleasant noises coming from the gearbox, you will have to check its condition and, accordingly, lubricate it more often.

To lubricate the gearbox, you will need to do the following steps:

Find a plug on the gearbox, the role of which is to close the technical hole used to insert new lubricant;
Remove this plug using the special key supplied with the trimmer;
Use lubricants, for example, such as Litol-24, Oleo-Mas or regular machine oil. Apply them to the gears through the hole in the gearbox. During the operation, slowly rotate the gears to achieve uniform lubrication;
Tighten the plug on the gearbox and start the engine. Make sure that the extraneous noises previously coming from the gearbox have stopped.

If you hear from the gearbox loud knock Most likely, the reason for this is that the bearings have worn out due to intense work, insufficient lubrication, or due to dirt getting into them. There is only one solution in this situation - replacing failed components.

If you find that the trimmer cutting element has stopped working and is not rotating, the most likely cause of the problem is wear of gears, or rather, their teeth, which no longer touch each other and do not transmit torque from the motor. The malfunction is eliminated by disassembling the gearbox and replacing the gears with new ones.

A petrol mower is one of the most important tools for summer residents, and in general, owners of private houses. The main purpose of this unit is to mow grass on personal plot, turning it into a beautiful, soft perfect lawn. But before you start working, the device needs to be lubricated, that is, those parts that rub together in it, it is also necessary to replace the cutting parts, and fill the tank with fuel. If problems with the motor are identified, you need to repair the lawn mower yourself, and for this you need to thoroughly understand its structure and the essence of its functioning. This is all usually outlined in the user manual that is included when you purchase the chainsaw.

How to repair a lawn mower if the engine does not start

In this case, you need to check whether there is fuel in the tank. Be sure to use only high-quality A-92 gasoline for your device so that it does not break down and serves you for a long time. You can purchase fuel at any gas station. For example, in the same place where you refuel your car. If you save money and buy cheap fuel, the cylinder-piston group may be broken as a result, and its repair is very expensive for mower owners! It can amount to as much as a third of the total price of the unit. It is also very important that the mixture of oil and gasoline is properly prepared. The unit's user manual must indicate the proportions in which this mixture should be prepared. Do not prepare the fuel mixture in too large volumes. The thing is that if you store it in this form for a long time, it will lose most of its properties. Therefore, pour fresh mixtures into the lawn mower.

Petrol mower repairs may be required if the fuel filter is clogged, resulting in difficult engine operation. If you find a problem with starting, check the condition of the fuel filter. If necessary, it should be replaced. Under no circumstances should the incoming pipes be without a fuel filter!

The air filter also needs to be checked. If it is too dirty, it must be removed, washed with fuel and reinstalled. If you are at home or on own dacha, this filter, of course, is washed with water, you can even use detergents. Next, the filter needs to be rinsed well, squeezed and dried. When it has dried, you should moisten it quite a bit with the oil that you use to prepare the fuel mixture. If you apply too much oil, it’s okay; the excess can be removed by squeezing the filter well with your hands, as if squeezing it out. The removed cover must be replaced and secured.

The engine may not start if all of the above methods have been checked and done. In this case, it is worth adjusting the idle speed while tightening the carburetor screw. The video about repairing lawn mowers describes in more detail the essence of these procedures.

And so, we will tell you about ways to start the device if you already need to do work!

1. Repair of the lawn mower carburetor. Place the device on one side so that the air filter faces up. If the unit is positioned this way, the mixture enters the carburetor (or rather its bottom). Before starting the engine, you should remove the air filter, then pour just a little mixture into the carburetor, and then install the parts back. In this case, the engine will start literally very quickly.

2. If the 1st option still does not work, then the essence of the breakdown lies in the spark plugs. They should be checked by unscrewing them to see how efficient they are. The combustion chamber must be thoroughly dried. A spark plug that does not show any sign of performance must be replaced.

3. This method is also possible. It is necessary to close the air damper and pull the handle once. After this, you need to open the damper and pull the starter a couple of times. This must be repeated up to 5 times.

Some people pull the handle so hard that the mower starter needs to be repaired.

Be sure, most importantly, to strictly follow the rules written in the device user manual, which is attached to each unit, when purchasing in a store. And then you will not be afraid of repairing the lawn mower gearbox or any other types of breakdowns!

With frequent, intensive use of the brush cutter, the gearbox may begin to heat up or make sounds uncharacteristic of its normal operation, for example, grinding. This indicates that the mechanism needs to be lubricated. If this is not done in time, then more serious problems will arise (for example, the gears will wear out quickly and will need to be replaced), even jamming. Other breakdowns also occur with the transmission mechanism. You can repair and lubricate the gearbox yourself - to do this, you just need to familiarize yourself with the features of this work and stock up on some available tools.

A trimmer gearbox is a unit that transmits the rotational movement of the motor shaft to a knife or fishing line. It is located at the lower end of the brush cutter rod. The transmission unit is also designed to reduce the trimmer engine speed.

Depending on the model of the brush cutter, the mechanism consists of several gears rotating at high speed. As a result, they heat up due to strong friction. If there is not enough lubrication, or there is none at all, then the process leads to severe overheating and failure of parts, and, accordingly, the need to carry out complex repairs. To prevent this from happening, the transmission unit should be lubricated in a timely manner. The disassembled gearbox is shown in the photo below.

Disassembled gearbox

Gearboxes of modern trimmers different models from different manufacturers differ in design and size seat. It happens:

round;
in the form of an asterisk;
square.

The most common diameters of round seats are 24, 25.5 and 26 mm.

Brush cutters are equipped with gearboxes with different types gears:

conical;
worm;
spiroid;
cylindrical;
planetary;
wave;
combined.

The drive shaft and gearbox are heavily loaded trimmer components that are highly susceptible to wear. Between them, motion is transmitted due to the interlocking of gear teeth located at different angles to each other. Effectively gear only works if there are no mechanical damage. In this case, the mechanism should not overheat, otherwise it may jam.

Main gearbox malfunctions and ways to eliminate them

With electric gearbox or petrol trimmer Various breakdowns occur. The most common of them are presented in the table below. There you can also find the causes of their occurrence and methods for eliminating them.

Gearbox malfunction	Possible causes of failure	Remedy
the transmission unit gets very hot	use of inappropriate (poor quality) lubricant or its absence	need to replace or add lubricant
the transmission unit gets very hot	The gears are new and not worn in	To break in, you should work for a short time without heavy loads with regular stops so that the mechanism has time to cool down
shaft jamming during rotation, backlash and knocking	destruction or significant wear of any of the bearings	replace the failed bearing with a new one
the transmission mechanism flies off the mower bar or wobbles	damage to its body	part needs to be replaced
	damage to its body	in some cases, with minor damage, a clamp made of metal is used to tighten the area with the fracture
does not fit on the pipe	wear of the docking point	you can make a winding of insulating tape at the attachment point or change the rod
the output shaft with the knife does not rotate or stops if the load increases	wear of teeth on gears or one of them	replacement of the interacting pair of worn parts is required

Bearings fail due to the use of inappropriate lubricant or lack of lubricant. They are also damaged by harsh operating conditions brush cutters and the ingress of foreign particles of material (for example, broken metal teeth of mechanical gears) due to the fact that the integrity of the anthers is broken.

To remove the bearing, you need to disassemble the gearbox and use special puller. If it is not there, then you can try to do it with a hammer with an adapter. In this case, you should work carefully so as not to damage the seat. It is not recommended to use the preheating method to remove the bearing. This is due to the fact that the metal may lose the required performance characteristics.

If the knife stops rotating under load or even stands still, this is accompanied by an uncharacteristic sound.

Most gearbox problems can be easily fixed with your own hands. It is recommended to purchase replacement parts that are “original” and intended for the model of brush cutter used.

Trimmer gear lubrication

Lubrication of gears must be carried out regularly in accordance with the recommendations outlined in operating instructions the model used. This should also be done if:

new gears were installed;
atypical sounds come from the gearbox when the trimmer is operating;
The knives are difficult to rotate.

In addition to the gearbox, the trimmer shaft also needs to be lubricated regularly. This is the norm proper care behind the device.

With constant use of the trimmer, its transmission mechanism experiences stress from grass, dirt adhering to the blades, or due to changes in torque. You need to choose a high-quality lubricant to extend the life of the gearbox.

Types of lubricant used

When choosing a lubricant, the following factors must be taken into account:

degree of adhesion of the composition to the metal of the assembly;
product brand;
lubricant consumption by the transmission mechanism.

Well-known manufacturers, e.g. , Stihl, Husqvarna and others, in addition to trimmers, also produce lubricant for them. Such products not only reduce wear, but also protect the gear metal from corrosion. Therefore, for brush cutters from these brands, it is better to use their own lubricants.

If the composition used for lubrication has good adhesion, then it is practically not squeezed out of the gearbox through the gaps.

Different models use lubricant differently. This is determined to a large extent by the intensity of use of the brush cutter and the heating of the transmission mechanism. It is considered that the lubricant is sufficient if the temperature of the gearbox during operation does not exceed40°С.

By consistency, lubricants for trimmers can be:

liquid;
semi-liquid;
hard;
plastic.

In terms of composition, they are in demand the following types lubricants:

graphite, significantly reducing friction, as a result of which gear rotation improves;
lithium, which are also an excellent anti-corrosion composition, saturated with additives that increase the wear resistance of the metal without harmful substances;
universal, containing highly purified mineral oils and performance-enhancing components.

Examples of suitable lubricants are: Champion EP-0, Gear Grease OREGON, Oleo-Mas, Azmol 158, Litol -24. You should also pay attention to manufacturers' advice on this issue and use the materials they offer. You can buy them at specialized retail outlets.

Champion EP-0 universal lubricant 120 g

Algorithm for self-lubrication of the gearbox

To carry out lubrication of the transmission mechanism, its preliminary no disassembly needed. The device already has a special hole for these purposes (it is shown in the photo below). In addition to the gears, when carrying out lubrication, you need to pay attention to the following elements of the mechanism:

bearing unit;
flywheel and starter coil pawl.

Lubricant injection hole

Fill in oil or add solid lubricant through a grease fitting closed with a screw. In this case, perform actions in the following sequence:

clean the gearbox housing from dirt and adhering grass, especially carefully the area around the plug so that debris does not get inside the mechanism;
using the appropriate tool (often it comes with the trimmer), unscrew the plug;
the selected lubricant is injected into the open technological hole from a tube or using a syringe, as shown in the photo below;
screw the plug into place.

Gear Lubrication

When applying lubricant, you need to rotate the knife so that it is evenly distributed over the teeth of the moving gears.

If for any reason the gearbox needs to be disassembled, then the old lubricant must be completely removed from the entire surface of the gears, housing, and shaft, and only then a new one must be used. It is convenient to lubricate the disassembled mechanism with solid compounds.

The entire gearbox lubrication process is demonstrated in the video:

The transmission unit must be lubricated at least once a year, but it is recommended to do this every 20 hours of intensive use of the brush cutter. If the first signs of malfunctions with the mechanism appear, you need to add lubricant as quickly as possible.

How to replace a trimmer gearbox: algorithm of actions

To replace the gearbox with a similar part from the same manufacturer, it must first be disassembled and removed from the rod. They operate according to the following algorithm:

loosen the coupling bolts located under the transmission mechanism;
Using pliers, remove two corkscrew rings;
using a puller, pull the bearings from the driven and drive shafts;
then assemble the mechanism into reverse order installing all spare parts.

The disassembled transmission mechanism is shown in the photo below.

Disassembled gearbox

If you don’t have a puller at hand, you can try carefully knock down the bearings. When they have become stuck and do not budge at all, you can heat them using industrial hair dryer(at a temperature of 600°C) and remove.

Assembling the transfer unit is easier than disassembling it. It may only take a light tap with a hammer to seat the parts into place. After assembly, be sure to check that the driven shaft can be turned by hand.

When there is a need to replace the transfer unit with a non-original part, then it should be taken into account their interchangeability. The following should be taken into account:

rod diameter (this parameter is often 25.4 or 26 mm);
parameters of the drive shaft - the shape of the connecting point and the diameter (its common value is 8 mm);
option for securing protection.

If the considered parameters match, then it will be possible to install a part from other models.

Timely lubrication of the gearbox will ensure its long-term operation without repairs. Besides, modern materials They protect the metal well from corrosion and increase its wear resistance. When choosing, preference should be given to the lubricant recommended by the manufacturer of the trimmer being used. If it is not possible to purchase such compositions, then the considered or other analogues suitable for their properties should be used. When it is necessary to disassemble a mechanism during repairs, this should be done carefully so as not to damage individual parts.

At first glance, a simple device for mowing grass using a two-stroke engine has fine tuning. Repairing a lawn mower should be entrusted to a specialist or you should study the equipment yourself using the instruction manual. Maintenance of the scythe is necessary. Lubricating the gearbox, replacing the fishing line, and sharpening the teeth can be done on your own.

Petrol mower malfunctions and how to fix them

Any type of lawn mower has a hollow rod in which a connecting cable is placed between the engine shaft and the lower gearbox, which transmits rotation to the working body with the cutting tool. At the top there is a carburetor and motor, at the bottom there is a gearbox and a working tool covered with a casing. In the middle part there is a transverse handle in which control buttons are located. To unload the hands, there is an unloading belt that holds the bar with the operator’s torso.

When choosing a lawn mower, it is preferable to have a device with a two-stroke engine rather than a four-stroke one. A two-stroke engine is more maneuverable and easier to repair. With a four-stroke unit, the vibration level is lower.

They follow this, repairing a lawn mower consists of troubleshooting,

the engine does not start,
the cutting mechanism does not gain momentum,
the engine stalls
the gearbox gets hot,
an extraneous knock is heard, strong vibration of the rod.

Before troubleshooting, you need to diagnose and identify the non-working unit.

Chainsaw engine does not start

If the mechanism does not start, it stalls immediately, check sequentially:

is there fuel in the tank,
spark plug serviceability,
cleanliness of the air and fuel filters,
cleanliness of the breather and exhaust channel.

It is necessary to refill with a freshly prepared mixture based on AI-92; the oil is injected for precise dosage with a medical syringe. This will help avoid expensive chainsaw repairs.

The next step will be carburetor repair, where you will have to find the fault and fix it, taking into account the tiny size of the parts. If the simplest operations do not bring results, in order not to disrupt the fine tuning of the system, it is better to entrust the repair to a specialist. Where to start diagnosing and how to properly repair a lawn mower with your own hands, watch the video:

Repair and lubrication of the lawn mower gearbox

The role of the gearbox is to transmit torque from the motor shaft to the cutting tool through 2 toothed gears with different numbers of teeth. Torque is transmitted at an angle of 30. The speed of the lower cutting disk is 1.4 times less than the engine speed. Gears must be clean and lubricated. There is a hole under the screw on top to supply oil to the teeth.

The lawnmower gearbox is lubricated at least once a season. If the work is intensive or there is extraneous noise in the lower unit, it is necessary to lubricate more often.

Too little or too much lubrication can cause the gearbox to heat up. An audible knock and play indicate the destruction of the bearing or the ingress of dirt due to damage to the anthers. Bearings must be replaced using a puller, without using the heating method.

Disassembly of the gearbox with removal of the shaft and bearing units cannot be carried out using heat. When heated, the metal loses its strength qualities and subsequently the unit becomes unreliable. To remove bearings, use a puller.

When replacing a gearbox, it is necessary to select a new unit, guided by:

pipe diameter,
drive shaft diameter,
cross-section of the drive shaft,
method of securing protection

Caring for cutting units of lawn mowers

If the cutting tool is a fishing line, it gradually wears out and new material is installed in the reel. The principle of operation of a cutter with a fishing line is the gradual unwinding of the reel under the influence of centrifugal force. When in contact with grass, the fishing line wears out and is fed out of the reel gradually. Special winding is needed so that two cutting elements come out at the same time and do not get confused with each other.

The figure shows how to correctly wind the fishing line onto the reel of a lawn mower. Before winding a new fishing line you need to:

unscrew the nozzle, carefully remove the cover, holding the spring with your hand,
remove pieces of old fishing line from the reel,
measure 5 meters of new string and fold it in half,
there are guides in the reel for 2 ends, hook the middle part to the notch and wind in the direction of the arrows for each half of the string,
pass the remaining 20 cm through special recesses at opposite ends of the coil,
install the spring and washers, bring the ends of the fishing line out, close the drum with a lid.

To better understand how to change the fishing line on a lawn mower, watch the video.