Repairing a lawn mower with your own hands: possible causes of the malfunction and options for resolving the problem

Surely any summer resident or owner of a private home has at least once thought about buying a tool such as a gas trimmer (also called a gas trimmer). And this tool is really useful, because thanks to it you can very quickly put your plot of land in order. This equipment is purchased in order to mow the grass in your garden.

Trimmer breakdowns and methods for eliminating them

Do-it-yourself trimmer repair involves eliminating all problems that interfere with the normal functioning of the unit. Among the most common are the following:

breakdown of the CPG (cylinder-piston group) of the engine;
the trimmer fails when trying to increase the operating speed;
ignition coil failure;
there is no connection between the motor and the gearbox;
there are extraneous sounds during operation;
the engine cannot reach the required speed.

Failure of the engine's CPG can occur due to low quality fuel or wear and tear of engine parts. As you know, the piston group is lubricated thanks to the oil that is added to gasoline. In old oil, the lubricant precipitates out, which makes the oil unusable. If you continue to try to start the trimmer, you can ruin the motor in a matter of seconds, and this will entail additional costs for repairing the trimmer. This breakdown is considered the most expensive. To eliminate it, it is necessary to replace the piston group assembly; to be more precise, it may be necessary to replace the cylinder, rings, piston and seals. In such cases, it is unlikely that you will be able to do without additional help, unless you are a master yourself and know how to handle such equipment.

You can repair a lawn mower yourself if it starts and idles, but then chokes when you try to increase the operating speed. To eliminate this breakdown, carburetor repair or cleaning of the muffler or gas filter is required. At first glance, everything can be solved quite simply, but if after you clean the clogged parts of the trimmer, it does not work, then additional diagnostics may be required.

Cutting part of brush cutter

Regardless of the manufacturer, almost every model comes with fishing line and steel knives.

Trimmer cutting part

The cross-section of PVC trimmer line can vary from 1.5 to 3.0 mm.

Made of durable polymer, during mowing it is subject to intense wear and, as a result, breakage. Therefore, from time to time it is necessary to check the presence of fishing line in the head and, if necessary, replace it. It is recommended to purchase an additional bobbin to quickly replace it with a reel that has run out of line.

The trimmer gets very hot

Overheating of the trimmer can occur for many reasons:

gasoline does not have the same octane number as indicated in the instructions for the unit;
the proportions of gasoline and oil were not observed during preparation of the fuel mixture;
the mixture of fuel and oil was prepared a long time ago (the mixture cannot be stored for more than 2 weeks);
the trimmer operates beyond the time specified according to the instructions;
a low-power trimmer is used on thick and hard grass, the device works with overload and heats up quickly;
has moved towards the rod or the cassette cover has become stuck.

The latter happens if you install a mowing head that is not suitable for this unit.

, or when the axis moves inside the rod. These changes make it harder to rotate, the load on the engine increases, and it overheats.

What does a brush cutter consist of?

Even before studying the repair instructions, you should take an interest and find out the structure of your device. We will give an approximate diagram of the structure of the device, but a certain model may have its own design features.

Grass trimmers contain 3 parts - a gasoline engine, a rod, inside of which there is a shaft and a blade with an accompanying cutting system. The blade speed moves from the motor through the entire shaft.

If the mower has a curved handle, the cable will do what the shaft should do. The rod is attached to the motor gearbox.

At the top of the rod there are controls for the lawn mower and along it there are handles to support the device and conveniently control the work.

When you press the gas

If the gas pump stops when you press the gas, the reasons may be as follows.

The most common option is carburetor adjustment, which occurs when there are significant loads on the drive, after prolonged inactivity of the mechanism, or when it is used in harsh conditions.
The fuel valve is clogged, which prevents its relaxation, as a result of which gasoline in the system begins to flow normally.
Loosening and lowering of the cable in the carburetor. Expansion of the fuel hose can also occur before it breaks due to significant stress.
A clogged chimney (check valve), resulting in a lack of fuel in the tank.

If the problem is related to the carburetor block, then this may be recognized as the appearance

. When a hose breaks or a cable stretches, these components are replaced.

Surprise from Khopr

Since the Hopper starts up easily with the air damper open, I did not immediately notice that the air damper lever had rubbed the fuel hose almost completely through at the point of contact:

If you see that your trimmer's choke lever is resting on the fuel hose, insulate the hose at the point of contact and file or sand the sharp edge of the lever.

Other articles: Adjusting the carburetor of a lawn mower, trimmer Lubricating the shaft and gearbox of a lawn mower, trimmer Adjusting the valves of a lawn mower, trimmer Adjusting the valves of a diesel walk-behind tractor Heavy diesel walk-behind tractor (starting, storage) Maxcut MC 55 motor drill - drilling holes for poles Leveling a concreted metal pole

AgroSemFond online store - seeds, planting material and other gardening products by mail from Nizhny Novgorod.

Peculiarities

It should be noted that the gasoline scythe is very easy to operate. It is enough to see how other users use this unit to start using it fully. Performing basic technical functions is intuitive and does not require any difficulties in practice. Properly running in a gasoline trimmer is also not difficult. Moreover, there is almost no difference between devices of the household and professional categories.

The key difference is the type of motor. On professional equipment it is more powerful and produces more revolutions. The two-stroke engine is more often used in household models. Four-stroke units are more reliable and produce more force, so they are suitable for special conditions, complex and overgrown areas.

Gasoline trimmer device

The main component of any gasoline tool is the internal combustion engine (ICE), which transmits torque to the executive body through various methods. In a modern lawn mower, an alloy rod (pipe) is used as a transmission element between the motor and the trimmer head, inside which the drive shaft is located.

Petrol trimmer Husqvarna

Thanks to the high-speed engine, the rotation speed of the fishing line can reach 13 thousand revolutions per minute, depending on the manufacturer of the braid. In order to avoid mechanical and thermal damage to the gearbox, a special hole is provided in its housing for introducing lubricant in the form of ointments. To make the headset easier for the owner during long-term work, all models of brush cutters are equipped with a durable shoulder strap.

Dry and wet spark plug, what does this mean and how does it affect engine starting?

Most tool owners immediately resort to checking the condition of the spark plug contacts. This is done in order to understand from the condition of the spark plug what could be the reason for the impossibility of starting the lawn mower engine. Based on the condition of the spark plug contacts, appropriate conclusions can be drawn about what may be causing the malfunction. Diagnosis of the spark plug on the trimmer is performed in the following order:

The spark plug is unscrewed, after which it is subject to inspection. The ideal condition of the electrodes is if they have a brown soot (brick color). If the spark plug is wet and has black or white carbon deposits, this indicates a corresponding malfunction
If the spark plug is wet, then there is a portion of unburnt fuel in the combustion chamber that does not need to be drained. Clean and dry the spark plug contacts, then make sure it is in good condition. To do this, connect it to the candle holder and place it on the surface of the cylinder. Turn on the ignition and pull the starter handle lightly. In this case, the spark plug should produce a high-quality and constant spark. If the spark is weak or absent at all, then the spark plug should be replaced.
The trimmer may not start due to a large gap between the spark plug contacts. The gap between the spark plug electrodes should be in the range from 0.7 to 1 mm. To set the gap, special feeler gauges are used

This is interesting!
Drying spark plug contacts by calcining them is strictly contraindicated, as this method will lead to damage to the part.
If there is a spark at the spark plug, but the trimmer does not start, then the reason lies in the supply of the fuel mixture to the combustion chamber. To make sure of this, you should do the following:

Take 20 grams of fuel into the cap of a PET bottle or into a syringe
Pour it into the combustion chamber through the spark plug hole
Screw in the spark plug
Put on the candle holder and start the engine

If the engine of the lawn mower starts after the above steps, then the cause of the malfunction should be sought directly in the fuel line and carburetor. If the engine does not start even after these steps, then you need to check the serviceability of the high-voltage wire. The high-voltage wire, like the spark plug, is a consumable item. If there is a suspicion that the trimmer armored wire is faulty, it should be replaced

If, after the above steps, you cannot start the engine of the lawn mower, then you need to take into account the following recommendations:

If there is any doubt about the serviceability of the spark plug and high-voltage wire, it is recommended to replace them immediately
Check that sparking is working properly, and if there is no spark on the new spark plug, then the breakdown is related to the ignition unit - coil failure
The ignition coil is not repaired, but replaced. If the diagnostics really indicate a malfunction of the lawn mower’s ignition coil, then it is not difficult to replace it with your own hands

https://youtube.com/watch?v=YixHJCGg9gg%3F

If there is a spark plug, and it is dry, and the trimmer does not want to start, then we move on to checking the next unit - the air and fuel filters.

This is interesting!
If the spark plug electrodes are red or pink, this indicates that the fuel used contains a large amount of additives. You should refuse such fuel by changing the gas station or brand of gasoline.

Electric trimmer vibrates

Many users of mowers have noticed that after some time after the device starts operating, it begins to vibrate strongly. Some trimmers, mainly more expensive models, have an anti-vibration system in the form of shock absorbers located between the engine and the rod. But in some cases, even this cannot save you from strong vibration. The reason that strong vibration appears in the trimmer may be a small amount or complete absence of lubricant on the rigid or flexible shaft located inside the device’s rod.

Replacing the lubricant of the rigid shaft is as follows:

unscrew the gearbox located at the bottom of the rod;

after removing the gearbox, you will see the end of the shaft, which you need to pull to remove the part;

after removing the shaft, it must be generously lubricated with special grease “Shrus-4” or regular grease “Litol-24”;

Apply a small amount of lubricant to the shaft and spread it evenly along the entire length of the part, including the splines at the ends of the rod (if they are worn out, the shaft will have to be replaced);
After lubrication, insert the shaft back into the rod and put the gearbox in its original place.

Lubrication of the flexible shaft is carried out as follows:

unscrew and remove the mowing head;
remove the rod from the electric motor by unscrewing a couple of bolts;
pull out the flexible cable from the rod;
Lubricate the cable along its entire length.

This is done like this: first you need to lubricate the end of the cable, and then insert it into the rod, after which, as it moves inside the pipe, you should apply lubricant to the part and distribute it evenly over the surface. Then insert the flexible shaft rod into the electric motor and secure it.

If lubrication does not help and vibration continues to appear, you will need to change the flexible shaft.

The first step is to check the availability and quality of fuel

If you don’t understand why the lawn mower won’t start, then first make sure that there is fuel in the tank. Beginners often forget that they need to pause periodically to fill the tool with a gasoline-oil mixture. If the gas mower's tank is empty, then naturally it will not start, no matter how much you try to do it.

If there is fuel in the tank, but it is impossible to start the engine of the tool, then do not rush to disassemble the carburetor. Make sure that the trimmer motor is started correctly as indicated in

If the launch is carried out according to the instructions, then it is important to consider the following points:

Use not just high-quality gasoline with the maximum octane number, but exactly the brand recommended by the manufacturer. And this brand is not always AI-95 gasoline. If you don’t know, then choose AI-92. The oil must be special - for two-stroke engines. If the lawn mower has a four-stroke engine, then you need to fill it with pure gasoline without mixing it with oil. You should not skimp on the quality of trimmer engine oil, just like you should not skimp on gasoline. After all, the service life of the engine depends on the quality of the fuel used. Observations show that most mowers control the process of preparing oil and gasoline for the trimmer only at first.

The more experienced the mower, the less attention is paid to the process of mixing gasoline with oil for a two-stroke engine. The ratio of gasoline to oil should be as recommended by the manufacturer

Usually this ratio is 25 to 1, that is, for 1 liter of gasoline you need 40 ml of two-stroke oil (motor oil for a car, much less used oil, cannot be used) Proper storage of the fuel mixture. It often happens that after preparing the fuel mixture, it sits for a long time, more than 2 weeks. It is impossible to store a ready-made mixture of gasoline and oil for a long time, as this leads to the fact that the oil precipitates, and thereby the properties of both petroleum products are lost. Even thorough stirring after long-term storage of the finished mixture is not a reason for its further use. That is why it is not recommended to prepare more than 2 liters of mixture at a time.

Make sure that all of the above points have been completed, and only then can you start checking the condition of the spark plug. The trimmer does not start for various reasons, and most of them can be identified independently. It is simply irrational to resort to disassembling the carburetor if it is impossible to start the engine. The next step towards troubleshooting is checking the condition of the spark plug.

This is interesting!
During long-term storage of diluted gasoline with oil, these elements decompose into heavy fractions. These fractions clog not only the instrument’s fuel filter, but also the carburetor channels. The maximum duration of fuel storage is no more than 14 days.

If the engine does not start

When the lawn mower does not start, you must first check to see if the fuel in the tank has run out. If everything is in order, then you need to check its quality - perhaps you purchased a cheap type of gasoline that is not suitable for the equipment. For the scythe, it is best to use good gasoline, which is purchased at gas stations; the grade should be at least AI-92.

You should not save money and purchase cheap fuel, as this will lead to the cylinder-piston group failing , and you can spend much more money on repairs than on high-quality gasoline.

It is also very important to prepare the fuel mixture correctly and combine oil and gasoline in the right quantity. The proportional ratio must be specified in the manual. That is why it is so important that it is written in Russian, because it is likely that different mower models require slightly different proportions for successful operation.

There is no need to use the fuel mixture in large volumes, since if the unused volume is stored indoors for a long time, it will lose its properties. It is better to use a freshly prepared solution.

A problem with engine operation can be contamination of the fuel filter. First of all, you have to check the filter. If necessary, replace it. Under no circumstances should the inlet pipe be left without a fuel filter. It’s also worth checking the air filter at the same time. If it gets dirty, you need to remove it, wash it in gasoline and put it back in place. If you are at the dacha or in a private house, then it will be enough to rinse it in clean water, using various detergents. After this, rinse, wring out and let dry. The finished filter is moistened in a small amount of oil, which is used to prepare the mixture. Excess is removed by squeezing the filter with your hands. Then the part can be put back.
If all these procedures did not help and the engine still does not start, then you can try to adjust the idle speed, to do this, start tightening the carburetor screw. This is very similar to tuning a similar part on a car. If you have no experience in adjusting the carburetor, then you can study videos on the Internet, which are very clear and accessible. There they will clearly show how you can adjust the carburetor of a lawn mower with your own hands.

There is no pumping

In a situation where the engine hums but there is no pumping, the problem may be in the network. If the voltage drops below 220 V, the engine may not have enough power to operate the compressor correctly. In this case, you can install a stabilizer in the network or, if the phase is overloaded, temporarily disconnect the electrical devices connected to it from the power supply.

Pressure switch

Another reason could be a clogged bypass valve, which is supposed to relieve high pressure. In this case, you need to remove and clean it. If the valve is damaged, it must be replaced.

In some cases, the reason may be incorrect operation or a malfunction of the voltage relay. It is difficult to repair it yourself, and if it is not possible to contact a service center for repairs, you can replace it.

General recommendations for repairs

It is important not to overestimate your own strengths, and if you are not sure that you can handle it yourself, call for help from friends who can understand this device.

It won’t hurt to look at photos of repairing lawn mowers; it’s still better than nothing; it’s useful to find videos teaching how to do this. If you think you can’t handle it or the device is new, take it to service.

If you can handle all this, go ahead, after carefully reading the information, you can do everything. But don’t forget that you should buy high-quality spare parts for lawn mowers from reliable stores.

Removing and disassembling the starter, replacing broken parts

To repair the trimmer starter, you will need to first disassemble it and then reassemble it. This process is not particularly difficult. To work, you will need a screwdriver with a tip of the desired shape.

Disassembly of the starter unit

The starting mechanism is disassembled in order to install new parts instead of broken ones in the following sequence:

use a screwdriver to unscrew the screw that secures the pulley with the starter cover;
remove the spring and antennae;
carefully remove the pulley (you need to turn your head away or work while wearing glasses and gloves);
determine why the trigger mechanism broke down;
if the spring has collapsed almost completely, then it is replaced;
when the spring leaves the hook, it is installed in its original place, bending the antennae first (the photographs show the installation process);

After the spring plate is installed inside the groove, carefully twist it. To change the spring, you should work carefully and carefully: it may accidentally burst under the influence of the force caused by installing it in place

Even if you carefully remove the roller, the spring strip very quickly flies off the reel and can injure your hand with its sharp edges

To change the spring, you should work carefully and carefully: it may accidentally burst under the influence of the force caused by installing it in place

Even if you carefully remove the roller, the spring strip very quickly flies off the reel and can injure your hand with its sharp edges

Starter assembly

Assembly of the starter unit is carried out in a number of stages:

the coil is turned over, installing it so that the spring bend fits exactly into the groove of the body, as in the photo below;

place two washers, between which a spring is placed;
put the cup with antennae in place;
tighten the screw (photos below).

When performing the above manipulations, it is necessary to place two washers. If this is not done, the spring will eventually damage the plastic cup, and when it is tightened, wedging will begin. Because of this, it feels as if a spring has come off. To eliminate this drawback, you need to install this part of a longer length or an additional washer.

When such spare parts are not available, you can simply unscrew the screw slightly and the starter unit will start working without jamming. But this option is temporary - it is better to repair it efficiently as quickly as possible.

Spring tension

After installing the spring, it should be tensioned. To do this, perform the following steps:

remove the handle from the starter cord;
then the rope is inserted into the spool groove;
tension the spring by rotating the coil in the direction opposite to the clockwise direction (winding);
make the required number of revolutions specified in the operating instructions for the trimmer model used and corresponding to the length of the cord used;
at the very end, the rope is threaded into the hole intended for this purpose, located in the starter cover;
put the handle in place, fixing it with a knot.

If after repair the spring continues to fly off, you can get rid of it in the following ways:

squeeze a piece of the plate of suitable size into the groove at the location of the spring hook;
Drill holes on both sides of the groove in the coil into which to insert the spring hook and secure it with a wire.

Replacing a broken cord

A torn rope is replaced in the following sequence:

the old cord is removed;
choose a rope of appropriate size (thickness and length);
having threaded it through a special hole located in the reel, tie a knot;
cock the spring, producing the required number of revolutions;
secure the handle.

Assembling the starter on the trimmer and winding the spring is not difficult, you just have to do it carefully and with caution. For different models of lawn mowers, the breakdowns of the starting mechanisms are the same, so they are repaired in the same way

However, there are some nuances associated with their design features.

How to fix breakdowns and malfunctions of a chainsaw

Hundreds of sawmills encounter chainsaw malfunctions every day. Now let's look at ways to eliminate them. Experienced sawers know the problems with their tools and don't need to read instructions on how to identify and fix problems. However, such instructions will be useful for those who have not yet mastered their newly purchased gasoline unit.

If the candle has carbon deposits, it should be cleaned. Before starting the engine again, it is recommended to change the fuel mixture
If the spark plug is wet, you will need to adjust the carburetor
Lack of spark requires replacement of the spark plug or high-voltage wire. On the new spark plug you need to set the gap to 0.2 mm
The fuel filter cannot be cleaned, so it should be replaced if the chainsaw is suspected of being faulty. Before replacing the filter, the fuel tank must be emptied.
The air filter needs to be cleaned. This is easy to do - remove the part from the tool, and then blow it with a compressor
If checking the fuel supply shows that the gas-oil mixture does not flow out of the hose, then it needs to be cleaned
The chainsaw carburetor is adjusted periodically when it is discovered that the unit begins to operate intermittently. Detailed adjustment instructions
If the chainsaw stalls under load, then only cleaning and adjusting the carburetor will help correct the situation.
When a chainsaw heats up and stalls, the cause is the ignition coil. As the tool heats up, the resistance increases, so the spark can either be lost or weakened, which affects the power of the unit. You also need to check the unit for air leaks from hoses, seals and gaskets
If the chainsaw revs on its own and does not slow down, it means that the fuel filter needs to be replaced and the air filter cleaned. If this does not help solve the problem, then you need to make sure the carburetor is set correctly. The reason for an unauthorized increase in speed is a lean mixture, when a large amount of air enters the cylinder and a low fuel content
If research has shown that the chainsaw muffler is faulty, then it should be dismantled and then cleaned. This must be done using special detergents, which can be purchased at a specialized center. When dry cleaning the muffler, you need to use a respirator, since soot contains many carcinogenic substances
After checking, a faulty CPG is detected. Everything is sad here, and if there is no sufficient compression or there are scoring marks on the walls of the cylinder or piston, then a major overhaul is needed. Upon completion of such repairs, do not forget to carry out
If the chain lubrication system malfunctions, it is necessary to determine the cause of the failure, and only then eliminate it. If the channels become clogged, they will need to be cleaned. If an oil leak is detected, it can be eliminated by sealing the tubes and channels or by replacing them

If a malfunction is detected, it should be eliminated as quickly as possible. If this is not done, then one part will lead to failure of the entire assembly or even the mechanism. Any instrument (Chinese, European or Russian) needs proper care, operation and regular preventive measures.

Publications on the topic

Learning how to properly wind fishing line onto the reel of a trimmer and lawnmower installation instructions

How to repair a starter on a chainsaw

When you press the gas, the chainsaw starts to stall - causes and solutions to the problem

Attachments for chainsaws or how to expand the capabilities of the unit

Storage and cleaning of tools

You can always ensure that any equipment is cleaned after use. All channels in the starter housing, as well as the cylinder fins, must be absolutely clean. If this requirement is ignored, this will lead to equipment failure.

Always allow the engine to cool before cleaning. We take a brush that has soft bristles and clean the entire outer surface of dirt . We treat plastic parts with a solvent, including kerosene, and you can also use a detergent.

When the summer season ends, the trimmer needs to be prepared for canning . To do this, drain the entire fuel mixture from the tank. The engine starts to burn out any remaining fuel in the carburetor. Clean the instrument well and place it in a dry place.

There are many companies that produce such equipment. These include the Husqvarna, Huter, and Shtil gas mowers. There are domestic or Chinese versions of lawn mowers with different calibers, but, by and large, they are designed similarly. Once you figure out why one failed, it will be easier to fix the breakdown on a new model, and therefore the repair experience is very useful and allows you to save money.

As you can see, you can repair a lawn mower yourself, and to do this you only need to correctly determine the cause , which is not so difficult to eliminate. The service will charge a lot of money for this. So much that it’s easier to just buy a new lawn mower. Therefore, there is always the opportunity to understand the design and make repairs yourself.

In what cases is it necessary to adjust the carburetor?

The stable operation of a lawn mower's carburetor largely depends on its correct settings.

Node adjustment is required in the following cases:

after running in a new trimmer, when 4–5 full tanks of fuel were consumed during operation;
when the operator frequently changes the brand of gasoline used for refueling;
as a result of sudden changes in weather;
due to prolonged storage of the trimmer;
as a result of arbitrary unscrewing of the adjusting bolts of the brush cutter caused by strong vibration of its motor;
due to a sharp increase in the amount of fuel consumed by the trimmer.

It will also be necessary to adjust the mower's carburetor in cases where carbon deposits quickly appear on the tool's spark plug, as well as when there is a sharp increase in the volume of exhaust gases emitted by the trimmer.

Briefly about engine repair

Problems in the engine begin after several years of proper operation due to wear of components or suddenly when the trimmer is used incorrectly. Unfortunately, people regret improper operation when they repair gasoline trimmers with their own hands after an engine breakdown. And this happens in cases where the dosage of oil in the fuel is not observed or the device operates to the point of terrible overheating. Overheating may cause the crankshaft to jam, the piston rings to break, or the piston to completely burn out. In order to perform a piston inspection, it is enough to remove the cylinder head, from under which the piston will appear, clearly reflecting the condition of its working surface. The rings themselves do not protrude from the cylinder, so it does not matter whether you change the rings or the piston, in both cases you will have to remove the cylinder. When repairing gasoline trimmers with your own hands, it is worth remembering the fragility

piston rings,

which can easily break if you lack experience. Installing the piston itself on the crankshaft is not too difficult. The main thing when repairing an engine is to assemble everything the same way as it was before disassembly, and then everything will work again.

Typical malfunctions of chainsaws

Having determined the causes of the chainsaw breakdown, you can begin to eliminate them. To eliminate this or that breakdown, you need to know what methods exist for this. First, let's figure out what malfunctions of chainsaws can arise during their operation:

Engine problems. The engine may not start or may stall immediately after starting. In addition, there may also be problems such as the inability to develop full engine power, which can often depend on the quality of the air-fuel mixture. If the engine runs unstably, then it is time to diagnose it.
Malfunctions in the ignition system. If the engine does not start, you should first inspect the spark plug. The presence of carbon deposits on the spark plug indicates that the ratio of gasoline and oil is incorrect or that one of these substances is of poor quality. If the spark plug is wet, this indicates an excess of fuel. The carburetor must be adjusted correctly. Be sure to check the presence of a spark on the spark plug, which will ensure that it is working properly.
Failures in the fuel supply system. The reasons for the inoperability of this system are: contamination of the fuel filter, clogging of the hole in the tank cap, as well as insufficient amount of fuel mixture entering the cylinder.
Carburetor failure. It is necessary to check this mechanism and clean it. Determining the cause of a malfunction in the carburetor is quite problematic if there is no experience, so it is recommended to contact specialists.
Malfunction of the exhaust gas removal system. Over time, the walls of the exhaust pipe become clogged with carbon deposits, which helps reduce the diameter of the exhaust pipe.
Piston or cylinder failure. They are one of the most serious breakdowns, as a result of which a major overhaul of the engine will be required. Scratches and scuffs appear on the piston or cylinder, and the piston rings or crankshaft bearings wear out.
Chain lubrication system malfunction. If there is no oil supply to the chain, this can lead to a number of negative consequences. Therefore, it is recommended to check its consumption after each oil refill. The reasons that oil does not flow to the chain may be clogged channels or a malfunction of the oil pump.
Broken chain hand brake. Occurs due to contamination of the brake band with grease or sawdust. It is strictly prohibited to operate a tool with such damage.

Most of the above breakdowns can be fixed on your own if you have experience, but if you don’t have it, you can try to fix the faults under the guidance of a specialist. In any case, you should first find out the cause of the breakdown yourself, and then decide how and who can fix it.

Problems with a used trimmer

List of malfunctions of a used lawn mower (gasoline trimmer) with any engine:

Malfunction	Possible reason
Noticeable loss of power Engine won't start	The muffler is clogged with products of incomplete combustion of fuel (carbon deposits). Clean the muffler.
Increased vibration of the rod	The mower shaft needs lubrication.

Return under warranty and post-warranty service

Those owners of chainsaws who just received a new tool in the morning, unpacked it and assembled it in accordance with the instructions, but were unable to start it or the engine starts and immediately stalls, are especially distressed. Let us warn you right away - under no circumstances try to disassemble the new engine and do not tear off the warranty stickers. Under such circumstances, it is best to exchange the faulty chainsaw for another, or request warranty repairs.

Standard chainsaw equipment

In accordance with the legislation of most CIS countries (including Russia and Ukraine), electric and chainsaws are subject to return if faults are discovered that were not specified by the seller.

The buyer may also demand a reduction in the price of the defective product, reimbursement of the costs of its repair, or a refund for the defective instrument. The owner of the chainsaw can make these demands only during the warranty period, subject to compliance with all the conditions specified in the warranty card. As a rule, the buyer is given 14 days to identify all faults and shortcomings and contact the seller.

Signs of a chainsaw engine malfunction

If you experience at least one of the symptoms listed below:

chainsaw won't start
chainsaw starts and stalls
the engine does not gain power
The engine stalls when running or runs rough

then we can say that there is a malfunction in the chainsaw engine. Below we will take a closer look at possible breakdowns and their causes.

How to clean up your hedge trimmer after use

An electric or petrol hedge trimmer that works well, without malfunctions, is a pleasure for the gardener and a big time saver.
In order for a brush cutter to be useful and not pose a threat, it must be handled correctly and repaired on time.
After each use of the hedge trimmer, it is recommended to clean it up:

unplug the hedge trimmer from the electrical outlet or remove the batteries;
sweep away debris and wipe the brush cutter body with a cloth;
clean the cutting blades with a cloth soaked in white alcohol, then wipe dry;
apply lubricant from a can to the blades and turn on the brush cutter for half a minute to distribute the lubricant evenly;
Remove excess grease with a cloth and place the hedge trimmer in the case.

Quick start of the unit

We place the tool on its side so that the air filter is on top. In this arrangement, it is possible to ensure that the fuel mixture reaches the very bottom of the carburetor. The engine can start on the first try if you remove the air filter before starting and pour a small amount of the mixture into the carburetor (a few drops are enough, and don’t get too carried away), and then install the recently removed parts back. This method has been tested in practice and works in most cases. Surely many owners of an old domestic car used a similar method on their car. The principle with the scythe remains absolutely the same.
If the first advice does not bear fruit, then you need to unscrew the spark plugs and look at them carefully. We unscrew the spark plug, check its functionality, and then dry the combustion chamber. A candle that shows no signs of life must be thrown out and a new one installed. If everything is in order with the old one, then we put it in place and move on to the next method.
If the spark plug is fully operational, the filter is clean, and the fuel mixture is fresh, then you need to resort to a universal method of starting the lawn mower. It is worth closing the carburetor choke and pulling the starter handle once. Then open the damper and pull the starter about 3 more times. This procedure is repeated 3 to 5 times. The engine should start. But you shouldn’t pull the handle too hard, because in this case you will also have to repair the starter of the lawn mower. This will only be needed if the cable breaks or the handle breaks. In other cases, it is recommended to replace the starter immediately. This unit is sold completely assembled.
There is also a very simple way to get a braid. Many people forget to press the gas choke after filling the fuel mixture. It is usually located near the gas tank. On a household mower, it looks like an ordinary ball of air, which must be pressed 5-10 times for the mixture from the tank to go as intended. In most cases, this option works flawlessly. You just need to help the fuel flow through the channel.

Correct replacement of spark plugs

Many people know that spark plugs should be changed periodically, but few do it correctly and in a certain sequence. To perform all the manipulations correctly, you should familiarize yourself with the correct procedure.

Stop the engine and wait until it is cold, otherwise you may be seriously burned.
Disconnect the high-voltage wire from the spark plug. We unscrew the spark plug using a special wrench. We examine the candle.
The part must be replaced if it is in poor condition, very dirty, or if a crack is found on the body.
Check the gap between the electrodes. Their size should be 0.6 mm.
We install a new spark plug and tighten it with a wrench.
We install a high-voltage wire on the central electrode of the spark plug.

There is nothing complicated in this procedure, and absolutely any owner of a gasoline scythe can cope with it.

The lawn mower stalls after starting

The engine may stall after starting the device if the carburetor is not configured correctly or is misadjusted. It's very easy to identify. Vibrations may occur and are clearly felt during operation. You can make the adjustment yourself; you should strictly follow all the instructions written in the manual.

The engine may also stall due to a clogged fuel valve. In this case, it must be cleaned, and then the problem will be eliminated.

If the scythe starts up and then suddenly stalls, this means that the supply of fuel to the carburetor is difficult. It is necessary to loosen the carburetor valves, then the free flow of fuel to it will be carried out in the required quantity.

If there is excessive air leakage, then the engine may also stall. You should increase the speed a little so that air bubbles leave the fuel system. It is also worth checking the integrity of the fuel intake hose. If any damage is found in it, the part must be replaced immediately.

DIY trimmer repair

Typically, gas trimmers are used in the summer. Before starting to use the tool, it is necessary to put it in working condition, that is, lubricate all parts, change the cutting accessories, and also fill the fuel mixture into the tank.

But such an unpleasant situation may arise when the engine does not want to start at all and immediately stalls, it is not able to gain a large number of revolutions. In this case, it is necessary to find the causes of the problem and eliminate all problems .

Not all people have dealt with such equipment before, and therefore are wondering how to repair a trimmer with their own hands. To repair a lawn mower yourself, you need to understand its structure, as well as the principle of operation.

This information is usually provided in a special instruction manual , which is issued upon purchase. You need to check its availability before purchasing a lawn mower. If you purchased an imported instrument, then the instructions should still be written in Russian, otherwise it is better not to buy such a device and look for one that you can figure out without the help of the Internet and a translator.

Petrol mower device

A long rod is attached to the gearbox of a two-stroke internal combustion engine. Inside the rod there is a shaft, through which torque is transmitted from the motor to the cutting part.

The fishing line or knife rotates at a frequency of approximately 10,000−13,000 rpm . The protective housing of the gearbox has holes into which lubricant is supplied using a special syringe. To make it convenient to use the tool, it is equipped with a special strap that can be thrown over the shoulder.

In order to be able to use the device, you must purchase the appropriate headset.

A fishing line with a thickness of 1.6 to 3 mm , which is independently placed in the trimmer head. When mowing the grass, the fishing line will be subject to a lot of wear, and therefore it is advisable to purchase it in a large roll. The replacement will be done in a fairly easy way: you can wind it with the same diameter on a bobbin or simply install a new reel, which is already sold with ready-made and correctly wound fishing line.

If you change it manually, then first carefully look at how it was originally attached in order to exactly repeat the winding. To properly load a new thread, you need to measure the installed piece and fold it so that one end is 15 cm longer than the other. The loop should be inserted into the slot on the spool, and then start winding the line in the direction of the arrow.

Knives that are installed for mowing weeds , small bushes or coarse grass. Knives have different shapes, and their number may vary depending on the purpose.

the device control levers should be located on it . The cutting mechanism is protected using a special casing. It is necessary to refuel lawn mowers with a mixture of oil and gasoline; it is poured into the tank. The design of semi-professional and household scythes equipped with a four-stroke gasoline engine will be slightly different.

The refueling scheme will also change a little, since in the first case oil will have to be poured into the crankcase, and gasoline into the tank. In the second option, gasoline and oil are mixed in the prescribed proportions and poured into the tank.