Do-it-yourself petrol mower repair

Modern technologies and equipment allow us to produce the best and optimal technical solutions that become effective assistants in the arrangement of a summer cottage or personal plot. The green lawn and other plantings can grow rapidly, to tidy up the local area and mow the lawns, a lawn mower is used, which is also called a lawn mower or trimmer, a gas mower.

Traditional scythes are inconvenient and unsafe to use, they require a significant investment of time and own effort, which will help save gas scythes that combine functionality and practicality in their design. In the photo of the lawn mowers, you can see various high-tech devices that have a set of operational characteristics, including such parameters as increased productivity and a long service life.

A convenient and reliable trimmer is a technical device consisting of separate mechanisms, parts and elements that can wear out, become unusable and damaged during intensive use.

Even with regular technical inspection, care and careful storage procedures, such devices and their individual parts require repair and even replacement, all repair procedures can be done independently.

Brief content of the article:

The easiest way is to give the lawn mower for repair by allocating a certain amount of funds from the family budget; prompt and high-quality do-it-yourself repairs are no less simple and convenient if you want to understand the design of the lawn mower and fix all the problems.

Mass and piece production of trimmers is based on the use of generally accepted technology, a typical design scheme consists of certain elements and parts, it is important to know them when carrying out independent repair work:

• top part. The basis of the whole structure, where all important elements are assembled, such as a starter, a carburetor and a lawn mowing engine;
• middle part. A hollow rod, inside it there is a cable connecting the engine and the gearbox, which sets the cutting line in motion. This part contains fasteners for distributing the weight of the entire structure and a belt for fixing the trimmer on the belt of a person using the trimmer for its intended purpose;
• Bottom part. It contains the gearbox and cutting elements, which are hidden under a practical cover, which protects the user. The casing provides an increased level of safety, preventing large fractions of debris, pebbles and glass from getting into a person while working with a lawn mower.

Knowing exactly the internal structure and principle of operation of the trimmer, you can independently carry out repair measures for the design or replace individual components that have become unusable using the repair instructions.

The most common and frequently occurring, self-correcting breakdowns of the unit include the following problems:

• engine malfunction, due to which the lawn mower does not start and does not work;
• increased vibration of the scythe rod, which complicates its intended use;
• increased overheating of the gearbox, its accelerated heating during operation;
• slow and weak functioning of the cutting line at insufficient speed;
• clogging of the starter grill, causing the engine to overheat and refuse to work;
• fast and frequent clogging of the carburetor due to the use of low-quality fuel;
• clogging of the air filter if the measures for caring for the device are not followed.

All these problems can lead to the fact that the device will lose its ability to work, before ordering the necessary spare parts for the lawnmower, a visual inspection and diagnostics of the device should be carried out.

Individual spare parts and assemblies of the device require special attention, you don’t have to contact a professional master to check them, a set of diagnostic measures will help you to identify the consequence of a loss of efficiency with your own hands.

If the trimmer engine does not start or stalls immediately after starting, when the gearbox overheats or during the operation of the device, extraneous noises are heard and vibration is clearly felt, it is important to make a visual inspection and identify a non-working unit.

To optimize the preparatory measures before repair, a simple diagnosis should be carried out and a step-by-step check should be made:

• the presence of fuel in the tank and lubrication in the main components;
• serviceability of the spark plug and its performance;
• cleanliness of the fuel and air filter of the lawn mower;
• clogging of the outlet channel and breather of the device;
• the quality of the fuels and lubricants used.

To determine the functional performance of the ignition of the lawn mower, it is necessary to determine whether the candle is working by testing the appearance of a spark when it comes into contact with the body of the functional device.

The spark plug itself can be replaced with a new one, after drying the candle channel, if necessary, the old element is also dried, cleaned with special tools and returned to its place.

In the process of inspecting the carburetor, it is worth paying attention to the possible leakage of the fuel used; in order to identify problems with the carburetor, the following measures must be taken:

• purging the fuel hose to eliminate possible clogging of the element;
• checking and replacing the gasket located between the engine and the carburetor;
• determination of tightness and maintenance of constant pressure in the unit.

If necessary, you can personally disassemble and thoroughly clean the assembly using gasoline, cleaning the jet and channels is carried out using compressed air.

The gearbox transmits torque from the motor shaft to the cutting tool; its gears must be absolutely clean and lubricated with special grease during operation.

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Conducting a technical inspection on your own once a season will eliminate the need to repair the gearbox or replace it, with the purchase of an expensive new unit.

The starter is necessary to bring the trimmer into working condition, its diagnostics consists in checking the tension of the cord engaged with the teeth of the starter coil, which are often destroyed during a sharp start.

A non-working starter in a lawn mower cannot be repaired; it must be replaced with a working unit as part of a mandatory technical inspection or a set of repair measures.

Separate attention and care require cutting elements, which must always be cleaned of dirt and mowed grass after use. Regular inspection and careful preparation of the device for operation will help to avoid costly and time-consuming repairs, and always be sure that the lawn mower is working.

An indispensable tool for a modern summer resident or owner of a private house is a lawn mower, which allows you to effectively and efficiently put the surrounding area in order. The period of active use of lawn mowers falls on late spring until October. Modern units are equipped with powerful and durable internal combustion engines, reinforced transmission and main components. Despite this, physical wear, manufacturing defects or improper operation lead to the failure of the trimmer. In order to repair the trimmer with your own hands, you must have at least basic knowledge in the field of technology and a little experience in repairing it.

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

Thanks to the high-speed motor, the line speed can reach 13,000 rpm, depending on the braid manufacturer. In order to exclude mechanical and thermal damage to the gearbox, a special hole is provided in its body for introducing lubricant in the form of ointments. As a headset that makes it easier for the owner during long-term work, all models of lawn mowers are equipped with a strong shoulder strap.

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

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

Made of durable polymer, it is subjected to intense wear and tear during mowing. 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 spool to quickly replace it with a spool with no line.

The ICE trimmers on the market today are equipped with a D-shaped, U-shaped or T-shaped handle, where the main controls of the unit are located. For example, in a U-handle scythe, the throttle key and stop/start toggle switch are located on the right handle. In the D-shaped version of the handle, the gas adjustment key is located directly on the bar.

Due to the presence of many components and parts, do-it-yourself trimmer repair involves the elimination of breakdowns that prevent its normal operation. It should be noted the most basic malfunctions of gasoline braids:

1. The trimmer motor does not gain momentum;
2. Breakage of the cylinder-piston group (CPG);
3. Ignition faults;
4. There is no connection between the internal combustion engine and the trimmer head;
5. Mechanical knocks during operation of the unit.
6. Repair of CPG lawn mowers

The main unit of any internal combustion engine is the cylinder-piston group (CPG), which can fail due to wear of parts or poor quality of the fuel mixture.

The lubrication of rubbing units in the lawn mower is carried out by adding a certain proportion of oil to gasoline. This process can be disturbed due to old oil precipitating out. In this situation, when starting the trimmer, the motor overheats greatly and the most expensive breakdown occurs in a matter of minutes. To eliminate the malfunction that has arisen, a complete replacement of the CPG will be required, namely: the piston, seals, cylinder and piston rings. If you are not an internal combustion engine repair master and do not have experience working with technicians, then it is unlikely that you will be able to fix the engine without the help of a specialist. Detailed information about the stages of repair of a piston trimmer can be found here.

When the ignition of the lawn mower fails, the spark on the candle disappears and, as a result, the fuel mixture does not ignite.

Spit spark plug design

It is important enough in this situation not to rush to replace the coil, since the cause of the breakdown may be the lack of contact in the switch on the control knob.

An important point when troubleshooting the ignition of the trimmer will be the diagnosis of the cut, where the distance between the side and central electrodes should be 0.5-0.7 mm. In addition, it is necessary to pay attention to the steel sealing ring on the candle, the loss of integrity or deformation of which can lead to etching of air from the combustion chamber and, as a result, a decrease in the power of the braid.

Ignition flywheel with coil

If the replacement check of the electrical circuit, the spark plug and its contacts did not give positive results, then you should pay attention to the trimmer ignition module, namely the gap with the flywheel. Regardless of the design features and the manufacturer of the lawn mower, the distance between the ignition coil and the flywheel should be no more and no less than 0.2 mm. To restore the optimal gap value, you will need to loosen the coil mounting bolts and set the trimmer ignition with a special measuring probe.

A clear sign of a malfunction in the engine power system is the absence of traces of the fuel mixture on the spark plug electrodes, which may be due to the following defects:

Components of the trimmer fuel system

• due to a clogged hole in the gas tank, a vacuum is created that prevents the normal flow of gasoline into the carburetor;
• due to the poor quality of the fuel and the ingress of foreign particles, the fuel filter installed in the tank is clogged;
• not entering the mixture into the combustion chamber as a result of clogging of the carburetor.

You can quickly determine the cause of the malfunction by dismantling the fuel hose leading to the carburetor. If the fuel mixture flows out in a thin stream, then you should pay attention to the carburetor. If there is no jet, it is necessary to clean the breather (a small hole in the gas tank cap) with a thin needle or replace the fuel filter.

If fuel enters the carburetor, then it is necessary to clean or adjust it. Adjusting the trimmer carburetor involves restoring the optimum mixing of the fuel mixture.

Trimmer carburetor with adjustment screws

To do this, pay attention to the three adjusting screws: maximum speed (H), minimum (L) and idle speed (LA). To start the adjustment, it is necessary to fully tighten the screws H and L and loosen them by 1 turn each. After we start the braid and let it warm up for 10 minutes to adjust the power system in operating mode. After warming up the internal combustion engine, press the gas supply button all the way (12,000 rpm). We restore the idle mode by unscrewing the screw LA. As soon as the trimmer head begins to rotate, it is necessary to tighten the screw until it stops.

One of the frequent malfunctions of the lawn mower is the incorrect operation of the internal combustion engine, namely, a drop in power with an increase in speed (the scythe stalls).

The reason for this work is the clogging of the exhaust system with particles of burnt oil. Often, manufacturers make mufflers prefabricated and cleaning is quite simple. If the design of the spark arrester is non-separable, then it must be placed in water with detergents, and then dried with a conventional or industrial hair dryer. Frequent clogging of the exhaust system indicates non-compliance with the proportions of oil and gasoline.

A benzokosa is one of the main tools of a summer resident used to quickly bring the land in order. This tool is also purchased for mowing grass in the backyard and owners of private houses. The period of active use of lawn mowers and electric trimmers falls on the summer period. Before starting operation, the tool is put into working condition: rubbing parts are lubricated, the cutting set is changed, the fuel mixture is poured into the tank. If the engine does not start at all or stalls quickly, without gaining a sufficient number of revolutions, then you have to look for the causes of the malfunctions and eliminate the identified malfunctions. To carry out repairs of lawn mowers with your own hands, you need to understand its structure and the principle of operation of the main components. This information can be found in the operating instructions, which the manufacturer applies to garden equipment without fail. Check for such a manual when buying a chainsaw. An imported tool must be accompanied by an instruction written in Russian.

• How is a household lawn mower arranged?
• What to do if the engine does not start?
• Quick Start Tips
• How to replace the spark plug correctly?
• Why does the lawn mower stall after starting?
• How to clean and store the instrument?

A long tubular rod is attached to the gearbox of a two-stroke internal combustion engine. A shaft passes inside the bar, transmitting torque from the gasoline engine to the cutting mechanism. The fishing line or knives rotate at a frequency of 10,000 to 13,000 rpm. In the protective case of the gearbox, there are holes into which grease is injected using a syringe. For ease of use of the tool, the manufacturer equips it with a special adjustable shoulder strap.

The cutting set is attached to the lawn mowers:

• The fishing line, the thickness of which varies from 1.6 to 3 mm, is located in the trimmer head. When mowing grass, the line is subject to wear. Changing the line is quick and easy in two ways: by winding line of the same diameter onto a bobbin or by inserting a new spool with already wound line.
• Steel knives with double-sided sharpening for a lawn mower for cleaning the area from weeds, small shrubs, hard grass. Knives differ in shape, as well as the number of cutting surfaces.

On the U-shaped, D-shaped or T-shaped handle attached to the bar, there are control levers for the brushcutter. The cutting mechanism is protected by a special casing. Household lawn mowers are refueled with a mixture prepared from gasoline and oil, which is poured into the fuel tank. The device of semi-professional and household lawn mowers equipped with a four-fold gasoline engine is slightly different. The refueling scheme is also different: oil is poured into the crankcase, and gasoline is poured into the tank.

The measured piece of fishing line is folded so that one end is 15 cm longer than the second. We put the loop into the slot on the reel and start winding it in the direction indicated by the arrow

If it is not possible to start a lawn mower, then the first thing to do is to check the presence of fuel in the tank and its quality. To refuel the tool, it is recommended to use high-quality gasoline purchased at gas stations, the brand of which must be at least AI-92. Saving on cheap fuel can lead to a breakdown of the cylinder-piston group, the repair of which can take a third of the cost of the lawn mower itself. Equally important and correctly prepare the fuel mixture of gasoline and oil. The proportional ratio of these components of the mixture is indicated by the manufacturer in the manual. Do not prepare the fuel mixture in large volumes, as long-term storage loses its properties. It is better to use a freshly prepared mixture.

When preparing the fuel mixture, pour the oil into gasoline using a medical syringe, which allows you to accurately maintain the required proportion of components

A clogged fuel filter in the tank can also interfere with the engine of the lawn mower. Therefore, if you have problems starting the engine, check the condition of the filter. Replace the filter if necessary. It is forbidden to leave the inlet pipe without a fuel filter.

The air filter also needs to be checked. When contaminated, the part is removed, washed in gasoline in the field and put in place. In the country or at home, the filter can be washed in water using detergents. After that, the filter is rinsed, wrung out and dried. The dried filter is moistened with a small amount of oil used to prepare the fuel mixture. Excess oil is removed by squeezing the filter with your hands. The part is then put into place. The removed cover is put back and fixed with screws.

The air filter, washed in the fuel mixture, wrung out and dried, is put in place in a plastic case and closed with a lid

How this procedure is done in more detail you can see on the video:

If all of the above procedures are carried out, and the engine does not start, then adjust its idle speed by tightening the carburetor screw. In the video posted at the beginning of the article, attention is paid to this issue.

Lay the tool on its side so that the air filter is at the top. With this arrangement of the chainsaw, the fuel mixture is ensured exactly at the bottom of the carburetor. On the first try, the engine will start if you remove the air filter before starting and pour a few drops of the mixture into the carburetor, then reinstall the dismantled parts. The method has been tested in practice.

If the first tip does not work, then most likely the problem is in the spark plug. In this case, unscrew the spark plug and check its performance, and also dry the combustion chamber. Replace the spark plug that shows no signs of life with a new one.

If the spark plug is in good condition, the filters are clean and the fuel mixture is fresh, then you can use the universal way to start the engine. Close the carburetor choke and pull the starter handle once. Then open the throttle and pull the starter 2-3 more times. Repeat the procedure three to five times. The engine will definitely start.

Some pull the handle with such force that they have to repair the starter of the lawn mower with their own hands. This is only possible if the cable breaks or the cable handle breaks. In other cases, it is recommended to replace the starter. This unit is sold as a set.

• Stop the engine and wait until it cools down.
• Disconnect the high voltage wire from the spark plug.
• Unscrew the part using a special key.
• Inspect the spark plug for replacement. The part is replaced if it is faulty, heavily soiled, has a crack on the body.
• Check the gap between the electrodes. Its value should be 0.6 mm.
• Tighten the new spark plug inserted into the engine with a wrench.
• Spend installation of a high-voltage wire on the central electrode of a candle.

As you can see, there is nothing super complicated in this procedure.

A new spark plug for a two-stroke internal combustion engine of a gasoline scythe is installed to replace the old part that failed

After starting, the engine may stall if the carburetor is incorrectly adjusted or misaligned. By what signs can one understand that the reason really lies in this? Very simply, by the vibrations that will be clearly felt during the operation of the lawnmower. You can adjust the fuel supply with your own hands by doing everything that is written in the instruction manual for the tool.

The engine may stall due to a clogged fuel valve. The cause is eliminated by cleaning it. If the lawn mower starts up, and then abruptly stalls, it means that the fuel supply to the carburetor is difficult. Loosen the carburetor valves to ensure that fuel flows freely to it in the right amount.

Too much air can also stall the engine. Increase the engine speed so that air bubbles exit the unit's fuel system more quickly. Also be sure to check the integrity of the fuel intake hose. If mechanical damage is found (cracks, punctures, etc.), replace the part.

During the operation of the lawn mower, monitor the condition of the engine cooling system. The channels in the starter housing, as well as the cylinder ribs, must always be kept clean. If you ignore this requirement and continue to operate the lawn mower, you can disable the engine due to overheating.

Proper care of a gasoline scythe during operation allows you to use it for several seasons in a row without major repairs.

Allow the engine to cool before cleaning. Take a soft-bristled brush and clean the outer surface of the dirt.Cleaning of plastic parts is carried out with solvents, including kerosene, or special detergents.

At the end of the summer season, the lawn mower should be prepared for long-term storage. To do this, the fuel mixture is drained from the tank. Then the engine is started in order to develop the remaining fuel in the carburetor. The entire tool is well cleaned of dirt and sent to "hibernation".

As you can see, it is quite possible to repair malfunctions of household lawn mowers on your own. Service should be contacted in case of serious breakdowns. In this case, the cost of repairs should be correlated with the price of a new lawn mower. It might be better to buy a new instrument.

Benzokosa is one of the main tools of summer residents, and indeed, owners of private houses. The main purpose of this unit is to mow the grass on the 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 against each other in it, it is also necessary to replace the cutting parts, and pour fuel into the tank. If problems with the motor are identified, it is necessary to repair the lawn mower with your own hands, and for this you need to thoroughly understand its structure and the essence of its functioning. This is all usually outlined in the owner's manual that comes with you when you purchase your chainsaw.

In this case, it is necessary 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 and serves you for a long time. You can buy fuel at any gas station. For example, in the same place where you refuel your car. If you save and buy cheap fuel, as a result, the cylinder-piston group may be broken, and after all, its repair is very expensive for the owners of mowers! It can make up 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 user manual of the unit must indicate the proportions in which this mixture should be prepared. Do not prepare fuel mixtures in too large volumes. The thing is that if you keep it in this form for a long time, it will lose most of its properties. Therefore, pour fresh mixtures into the lawn mower.

Lawn mowers may need to be repaired if the fuel filter is clogged, causing engine operation to be difficult. If you find a problem with starting, check the condition of the fuel filter. If necessary, it should be replaced. The inlet pipes must never be without a fuel filter!

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The air filter also needs to be checked. If it is too dirty, it must be removed, flushed with fuel and reinstalled. If you are at home or at your own dacha, this filter, of course, is washed with water, you can even use detergents. Next, the filter must be rinsed well, squeezed and dried. When it is dry, it should be moistened quite a bit with the oil that you use to prepare the fuel mixture. If too much oil has been applied, it’s not scary, 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 attached.

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

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

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

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2. If the 1st option still does not work, then the essence of the breakdown lies in the candles. They should be checked by unscrewing how efficient they are. Dry the combustion chamber thoroughly. A candle that does not show any sign of performance should be replaced.

3. This method is also possible. It is necessary to close the air damper and pull the handle once. After that, you need to open the damper and pull the starter a couple of times. So it is necessary to repeat up to 5 times.

Some people pull the handle so hard, as a result, it is necessary to repair the lawn mower starter.

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

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

Unfortunately, like any other technical device, a lawn mower sometimes breaks down. For example, the engine is not running or problems with the carburetor or starter, even if you periodically service the unit: change the cutting line or teeth, fill it with only 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 lawn mower device and do the repair yourself.

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

1. The upper part is considered the main one - the main elements of the lawn mower are concentrated here: starter, carburetor and engine;
2. The middle part is a bar, which is hollow inside and along which a cable is laid, connected at one end to the engine, and at the other end to a gearbox that drives the cutting line. There are also buttons with which the operator can control the brushcutter. Attached here is a trimmer weight relief belt that the operator puts on the body to make it easier for him to do his job;
3. The lower part consists of a gearbox and a cutting tool, closed with a special casing. This is done specifically so that the operator does not suffer from debris flying into him, glass and other dangerous objects that may be in the grass.

The most common breakdowns that occur during the 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 keep the speed and abruptly and for no reason stalls;
• the scythe bar vibrates strongly;
• the gearbox is overheating;
• weak speed at the cutting line.

Before proceeding with the repair, study the instructions that must be included in the kit in order to correctly diagnose.