DIY petrol mower repair

In detail: DIY repair of petrol mowers from a real master for the site my.housecope.com.

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

Traditional braids are inconvenient and unsafe to use, require a significant investment of time and effort, which will help save gas mowers, combining functionality and practicality in their design. In the photo of the petrol brush, you can see various high-tech devices, which are inherent in 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 individual mechanisms, parts and elements that can wear out, become unusable and damaged during intensive use.

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

Brief content of the article:

The easiest way is to give the petrol cutter for repairs, having allocated a certain amount of funds from the family budget, prompt and high-quality repair with your own hands is no less simple and convenient if you want to understand the design of the petrol cutter and fix all the problems.

Video (click to play).

The 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 entire structure, where all important elements are collected, such as a starter, a carburetor and a petrol cutter engine;
middle part. A hollow rod, inside it is a cable that connects the motor and the gearbox, which drives the cutting line. In this part there are 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 houses the gearbox and cutting elements, which are hidden under a practical cover to protect the user. The casing provides an increased level of safety, preventing large fractions of debris, stones and glass from entering a person while working with a petrol cutter.

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

The most common and common failures of the unit that need to be corrected on their own include the following problems:

engine malfunction, due to which the brushcutter does not start and does not work;
increased vibration of the brushcutter bar, 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 grille, causing overheating of the engine and its refusal to work;
fast and frequent clogging of the carburetor due to the use of low-quality fuel;
clogging of the air filter due to non-observance of the measures for the care of the device.

All these problems can lead to the fact that the device will lose its working capacity. Before ordering the necessary spare parts for the mowing, a visual inspection and diagnostics of the device should be carried out.

Particular attention should be paid to individual spare parts and units of the device, to check them you do not have to contact a professional master, a set of diagnostic measures will help you to identify the consequence of a loss of performance with your own hands.

If the trimmer motor 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 visually inspect and identify a non-working unit.

To optimize the preparatory measures before repairs, you should carry out a simple diagnosis and check step by step:

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

To determine the functional efficiency of the petrol-cutter's ignition, it is necessary to determine whether the spark plug 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, having previously dried the candle channel, if necessary, the old element is also dried, cleaned with special devices 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; to identify problems with the carburetor, the following measures must be taken:

purging the fuel hose to eliminate possible blockage of the element;
checking and replacing the gasket 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 unit using gasoline, the jet and channels are cleaned using compressed air.

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

Carrying out a technical inspection on your own once a season will allow you to get rid of 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 starter cord connected to the teeth of the starter coil, which are often destroyed during an abrupt start.

An inoperative starter in a petrol cutter cannot be repaired; it must be replaced with a working unit as part of a mandatory technical inspection or a set of repair measures.

Cutting elements require special attention and care, which must always be cleaned of dirt and cut grass after use. Regular inspection and thorough preparation of the device for operation will help to avoid costly and time-consuming repairs, and always be confident in the performance of the petrol brush.

The benzokos is one of the most important tools for summer residents, and indeed for owners of private houses. The main purpose of this unit is to mow the grass in the backyard, turning it into a beautiful, soft, ideal lawn. But before starting to work, 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 engine are identified, it is necessary to repair the petrol brush with your own hands, and for this you need to thoroughly understand its structure and the essence of its functioning. This is all, as a rule, set out in the owner's manual, which is attached when you purchase a chainsaw.

In this case, it is necessary to check if 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 will serve 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 money and buy cheap fuel, as a result, the cylinder-piston group may be broken, and its repair is very expensive for mower owners! It can make up a whole third of the total unit price. It is also very important that the oil / gasoline mixture is properly prepared. The user manual of the unit must indicate the proportions in which this mixture should be prepared. Do not use too much fuel mixture. The thing is that if you store it in this form for a long time, it will lose most of its properties. Therefore, fill the brushcutter with fresh mixtures.

The mower may need to be repaired if the fuel filter is dirty and the engine will not work properly. 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!

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 summer cottage, this filter, of course, is washed with water, you can even use detergents. Next, the filter must be rinsed well, squeezed out and dried. When it is dry, it should be slightly moistened with the oil that you use to prepare the fuel mixture. If you have applied too much oil, 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 reattached.

The engine may not start if all of the above methods are checked and followed. In this case, it is worth adjusting the idle speed while tightening the carburetor screw. In the video about repairing petrol cutters, the essence of performing these procedures is described in more detail.

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

1. Repair of the carburetor petrol cutters. Place the device on one of the sides with the air filter pointing up. If this is how the unit is positioned, the mixture enters the carburetor (or rather, its bottom). Before starting the engine, remove the air filter, then pour literally a little mixture into the carburetor, and then reinstall the parts. In this case, the engine will literally start very quickly.

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. And a candle that does not show any sign of working capacity must 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. This must be repeated up to 5 times.

Some people pull the handle so hard, as a result, it is necessary to repair the starter motor of the petrol cutter.

Be sure, most importantly, to strictly follow the rules written in the user manual for 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 petrol cutter gearbox, or any other types of breakdowns!

Very often, complaints from owners of gasoline trimmers are associated with various kinds of carburetor malfunctions. Of course, in this case, it is best to seek help from specialists in this field, for whom the repair of carburetors of gasoline trimmers is an integral part of the profession. However, if you are still familiar with the basic principles of the trimmer carburetor, you can try to figure out the problem yourself, so as not to overpay money in the service, since sometimes the breakdown can be really frivolous.

This article is just intended to help you deal with the problem.

Next, we will analyze the most common breakdowns and the reasons for their occurrence.

The first step is to generally inspect the carburetor and find out if there is any fuel leakage.

If it turns out that there are no problems with fuel, it is necessary to remove the carburetor from the engine and check the condition of the gasket located next to the carburetor.

If no malfunctions are observed here, you can try to check the carburetor for tightness.

To do this, you can purchase a special device, which is part of the tool kits for repairing the carburetor repair of mowers and representing a special pressure gauge that, in fact, checks the tightness.

If you don't want to spend money on its purchase, you can use a conventional medical tonometer, on which you just need to change the pressure gauge.

When using this device, pay attention to the indication.

If the pressure does not drop and remains the same for a long time, you can rest assured, as this indicates the tightness of the carburetor.

If the pressure begins to decrease after a certain time, then there are still problems.

They can be associated with damage to any parts of the carburetor.

Before running to the nearest repair shop or specialty store selling trimers and spare parts, try to figure out the problem yourself. Sorry for the banality, but the brushcutter carburetor is not a spaceship of an extraterrestrial civilization, and it is quite possible to repair it with your own hands. To be confident in your actions, read the step-by-step instructions provided in this article.

A visual inspection of the carburetor will help detect fuel leakage and air leakage, but the main reasons for the failure of the device lie inside. Therefore, in order to determine and most importantly fix the breakdown, the carburetor must be disassembled.

It does not take much effort to disassemble the carburetor of the brushcutter.

It is enough to unscrew four screws on one side

and two on the other. This can be done using a conventional Phillips screwdriver. Unscrew the screws carefully and fold them to the side. They may be needed during assembly. It is advisable to cover the table with a white cloth before disassembly so that everything is visible, even the smallest details that may fall out during disassembly.

We start disassembling from the side of the fuel supply system.

We remove the primer - a pumping bubble, which is remarkable, it is simply impossible to install the carburetor parts incorrectly during assembly. Products have characteristic ebb and flow.

Now we remove the membrane. It is she who performs the function of pumping fuel into the carburetor.

When the membrane vibrates, the other side exerts pressure on the rocker arm of the mechanism and the needle rises, which, in turn, opens the hole and fuel is supplied.

Remove the carburetor cover with the injection mechanism.

Further, another membrane is installed. We carefully remove it.

There is another gasket under the membrane. We also carefully remove it, without damaging it in any way.

Next, we move on to dismantling the parts from the back of the carburetor. As mentioned earlier, we unscrew the two bolts. This is already an air supply system.

A valve is located here, which, when gas is added, opens and increases the flow of air into the engine.

After removing it, a bare body remains in the hands. The carburetor is disassembled.

Identification of faults and their elimination

Now it is worth paying attention to the problems that occur during the operation of the carburetor and how to fix them.

The first thing that happens is that the holes and jets in the fuel supply system are clogged with dirt. Filters installed in the tank and directly in the carburetor do not help. They still allow small particles to pass through, which cause brushcutter failure.

Now we need to get the needle.

To do this, unscrew the bolt on the mechanism, holding it with your finger. The fact is, there is a spring there and a careless action will lead to the fact that it is lost.

We take out the needle, see photo and spring.

How to purge. The most effective way is to use an ultrasonic bath.

It is filled with either a special liquid or gasoline, a carburetor is placed there and under the action of ultrasound, the so-called cavitation effect, the channels are cleaned of contamination.

The second option for cleaning is compressed air.

You can use the compressor available on the farm and clean the carburetor channels. However, this method is effective if the contamination is not very large.

If there is neither an ultrasonic bath nor a compressor at hand, then cleaning can be done in the third way using a special cylinder for cleaning the carburetor. They are sold in almost all car dealerships and supermarkets. The price is not high and is about $ 2-3. Enough of such a cylinder for 4 or 5 purges.

Now we need to blow through the channels in the body and carburetor cover. See photo.

Another particle of dirt can get stuck under the needle. See photo. This will also lead to brushcutter failure.

Important! When cleaning the carburetor, never use needles, pins or wires. Even the slightest scratch will damage the carburetor. It will have to be changed entirely.

It is located on the carburetor cover and is a fine metal mesh. Its pollution occurs very often. This is due to the deposition of oil, additives, dirt on it.

Sometimes, when disassembling on the nets, a certain film is found. Therefore, the carburetor does not have enough fuel and the brushcutter either does not start or works intermittently. The cleaning methods are identical to the first reason: an ultrasonic bath, a compressor or a spray bottle with a special solution. In addition, if the mesh is clogged thoroughly, you need to take a soft brush for watercolors, soak it in gasoline and rinse it carefully without damaging it.

They have the ability to wear out during operation. From prolonged use, they deform, stretch, lose elasticity, poor-quality fuel corrodes them, and can no longer perform their functions well. This also applies to the needle itself. The fact is that it is covered with a thin layer of rubber, which wears out during operation and can no longer fit tightly into the hole. The brushcutter starts to work intermittently. To eliminate such a breakdown, it is necessary to replace all worn out parts. Where can I get them?

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If the ignition of the petrol mowers fails, the spark on the candle disappears and, as a result, the fuel mixture does not ignite.

Spit spark plug design

In this situation, it is quite important not to rush to replace the coil, since the cause of the breakdown may lie in the lack of contact in the switch on the control handle.

An important point when troubleshooting the trimmer ignition will be the diagnostics of the section, where the distance between the side and center electrodes should be 0.5-0.7 mm. In addition, it is necessary to pay attention to the steel O-ring on the spark plug, the loss of integrity or deformation of which can lead to etching of air from the combustion chamber and, as a result, reduce the power of the streamer.

Ignition flywheel with coil

If the replacement of the 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 clearance with the flywheel. Regardless of the design features and the manufacturer of the brushcutter, the distance between the ignition coil and the flywheel should be no more and no less than 0.2 mm. To restore the optimal value of the gap, 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 of the engine power system is the absence of traces of the fuel mixture on the spark plug electrodes, which may be associated with the following defects:

Trimmer Fuel System Components

due to a clogged hole in the gas tank, a vacuum is created, which 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;
non-flow of the mixture into the combustion chamber as a result of a clogged 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 with a thin needle (a small hole in the gas tank cap) or replace the fuel filter.

If fuel enters the carburetor, it must be cleaned or adjusted. Adjusting the carburetor trimmer means restoring optimal fuel mix.

Trimmer carburetor with adjustment screws

To do this, pay attention to three adjusting screws: maximum speed (H), minimum (L) and idle speed (LA). To start the adjustment, you need to fully tighten the screws H and L and loosen one turn each. Then 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 until it stops (12,000 rpm). We restore the idling mode by unscrewing the screw LA. As soon as the trimmer head starts rotating, tighten the screw until it stops.

One of the frequent faults of the petrol mowers is the incorrect operation of the internal combustion engine, namely the drop in power when the speed increases (the scythe stalls).

The reason for this is that the exhaust system is clogged with burnt oil particles. 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 an ordinary or industrial hair dryer. Frequent clogging of the exhaust system indicates non-observance of the proportions of oil and gasoline.

A petrol cutter (trimmer, brushcutter or petrol mower) is an 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. Killing weeds or trimming your lawn can all be done with ease with the trimmer. And much faster than if you use other methods.

Unfortunately, like any other technical device, the brushcutter sometimes breaks down. For example, the engine is not running or there are problems with the carburetor or starter, even if you periodically carry out maintenance of 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 brushcutter device and carry out the repair yourself.

Typical circuit, according to which manufacturers make their brushcutters:

The upper part is considered the main one - the main elements of the brushcutter are concentrated here: the starter, the carburetor and the engine;

The middle part is a rod, 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. Buttons are also located here, with the help of which the operator can control the petrol cutter. A belt is attached here to relieve the weight of the trimmer, which the operator puts on the body to make it easier for him to do his job;

The lower part consists of a gearbox and a cutting tool, covered with a special casing. This is done specifically so that the operator is not injured by debris, glass and other dangerous objects that may be in the grass that have flown into him.

The most frequent breakdowns that occur during the operation of the unit are:

the engine does not work, the trimmer will not start;
the engine manages to start, after which it does not hold speed and stalls abruptly and for no reason;
the brushcutter bar vibrates strongly;
the gearbox is overheating;
low speed at the cutting line.

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

If the engine of the device does not start, you need to check for the presence of gasoline in the tank of the petrol cutter. Keep in mind that when you refuel your device with a specially prepared mixture of oil and gasoline, the fuel must be at least AI-92. A certain amount of oil is added to the pre-calculated volume of gasoline using a syringe to avoid engine damage. After making sure that the problem is not in the absence of gasoline, we proceed to check the operation 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 in order with the candle, you will see a spark flashing between the body of the brushcutter and the candle.

Another source of trouble is that a mixture of oil and gasoline floods the channel into which the plug is screwed. Try drying the canal and drying and cleaning the candle 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 candles, you are unlikely to fix this kind of malfunction yourself, so you will need to contact a qualified specialist.

If you determine that the source of the problem does not lie with 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 starting the engine;
if the fuel mixture begins to flow out of the filter hole, then everything is in order with it; otherwise, replace the filter.

The last reason the engine won't start could be a clogged breather or muffler. You should make sure they are clean. If not, clean the exhaust port or breather.

A carburetor is a rather complex element of a brushcutter that should not be repaired by an unprepared person on his own, with the exception of performing some simple operations, for example, cleaning the inner surface of the product from contamination without completely disassembling it. Adjusting the carburettor trimmer it is better to entrust it to specially trained people who will be able to carry out the finest adjustment without disrupting its normal performance.

The role of the reducer in the trimmer is to mediate between the motor and the line, transferring torque from the motor to the bottom of the machine through two toothed gears.

To prevent gear wear in the gearbox and their premature failure, care must be taken to ensure that they are constantly lubricated. Most manufacturers indicate in the instructions supplied with the brushcutters that the gearbox must be filled with oil at least once a season. If you often and extensively work with the trimmer or hear unpleasant noises coming from the gearbox, check its condition and, accordingly, you will have to lubricate it more often.

To lubricate the gearbox, you need to do the following actions:

Find a plug on the gearbox, the role of which is reduced to the fact that it closes the technical hole used to put a new lubricant;
Remove this plug using the special wrench supplied with the trimmer;
Use lubricants such as Litol-24, Oleo-Mas or ordinary machine oil. Apply them to the gears through the hole in the gearbox. In the process of performing the operation, slowly turn the gears to achieve uniform lubrication;
Tighten the plug on the gearbox and start the motor. Make sure that the extraneous noises that were previously heard from the gearbox have stopped.

If you hear from the gearbox hard knockingmost likely, the reason for this is that the bearings have worn out due to intensive operation, insufficient lubrication, or due to dirt entering them. There is only one solution in this situation - to replace the failed units.

If you find that the trimmer head has stopped working and is not rotating, the most likely cause of the problem is wear of gears, more precisely, their teethwhich are no longer in contact with 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.

Video (click to play).