Very often, complaints from owners of gasoline trimmers are associated with various kinds of carburetor malfunctions. Of course, it is best in this case to seek help from specialists in this field, for whom the repair of gasoline trimmer carburetors 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 a breakdown can be really not serious.
This article is just designed to help you deal with the problem.
Next, the most common breakdowns and the reasons for their occurrence will be disassembled.
The first step is to inspect the carburetor as a whole and find out if fuel is leaking.
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 a degree of tightness.
To do this, you can purchase a special device, which is part of the tool kits for repairing the carburetor repair of lawn mowers and which is a special pressure gauge, which, in fact, checks the tightness.
If you don’t want to spend money on its purchase, you can use an ordinary 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 be calm, as this indicates the tightness of the carburetor.
If the pressure begins to decrease after a certain time, then there are still problems.
They may be associated with damage to any parts of the carburetor.
Before you run to the nearest repair shop or a specialized store selling trimmers and spare parts, try to figure out the problem yourself.Sorry for the banality, but the motokosa carburetor is not an extraterrestrial spacecraft, and it is quite possible to repair it yourself. To be sure of your actions, read the step-by-step instructions provided in this article.
VIDEO
A visual inspection of the carburetor will help identify fuel and air leaks, but the main causes of device failure lie inside. Therefore, in order to determine and most importantly correct the breakdown, the carburetor must be disassembled.
To disassemble the carburetor of lawn mowers, a lot of effort is not needed.
It is enough to unscrew the four screws on one side
and two on the other. This can be done with a regular Phillips screwdriver. Carefully unscrew the screws and fold 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 can be seen, even the smallest details that may fall out during disassembly.
We begin disassembly from the side of the fuel supply system.
We remove the primer - the swap bubble, which is noteworthy, it is simply impossible to install the carburetor parts incorrectly during assembly. Products have characteristic ebb and flow.
Now 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.
Next, another membrane is installed. We carefully remove it.
Under the membrane is another gasket. We also carefully clean it, without damaging it in any way.
Next, we proceed to the dismantling of parts from the back of the carburetor. As mentioned earlier, unscrew the two bolts. This is the air supply system.
There is a valve 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. Carburetor disassembled.
Troubleshooting and Troubleshooting
Now you should pay attention to the problems that occur during the operation of the carburetor and how to fix them.
The first thing that happens is the holes and jets in the fuel supply system become clogged with dirt. The filters installed in the tank and directly in the carburetor do not help. They still allow small particles to pass through, which cause the scythe to fail.
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 careless action will lead to the fact that it will be lost.
We take out the needle, see the photo and the 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 dirt.
The second cleaning option 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 a third way using a special cylinder for cleaning the carburetor. They are sold in almost all car dealerships and supermarkets. The price is low 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 the failure of the scythe.
Important! When cleaning the carburetor, in no case should you use needles, pins or wires. Even the slightest scratch will destroy 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, and dirt on it.
Sometimes, when disassembling into grids, a certain film is found. According to this carburetor, there is not enough fuel and the lawn mower either does not start or works intermittently. The cleaning methods are identical to the first reason: an ultrasonic bath, a compressor or a spray can 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 gently without damaging it.
They have the ability to wear out during operation. From prolonged use, they deform, stretch, lose elasticity, low-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. Motokosa starts to work intermittently. To eliminate such a breakdown, it is necessary to replace all worn parts. Where to get them?
In specialized stores of garden equipment, a repair kit for a carburetor of a lawn mower of a certain model is sold. The cost of such a repair kit ranges from 40 to 60 hryvnia.
It includes two diaphragms, a gasket, a needle valve and a spring.
All carburetor wear parts can be replaced. Therefore, you should not rush and buy a new one, and you don’t need to run to the workshop either, repairs can be done by any user of lawn mowers. Professionals claim that the quality of the components in the repair kit even exceeds the characteristics of native carburetor parts. Therefore, a well-repaired unit will work better than a new one.
In addition, the bubble button for manual fuel pumping may fail. The impact of gasoline on it leads to the fact that during long-term operation, the rubber corrodes and it begins to stick together or bursts under the influence of low temperatures, for example, during storage. The button should also be replaced if necessary. In addition, its cost is small and will not affect the size of the repair budget.
Based on the foregoing, we can conclude that there are only three main carburetor malfunctions: clogging of channels, contamination of the fine filter, and failure of components. In the first two cases, cleaning is enough, and in the third, a repair kit will help.
It is not difficult to assemble a lawn mower carburetor. You must perform all the steps in reverse order:
Install the spring and needle valve in the carburetor cap. While holding the spring with your finger, tighten the mounting bolt.
Screw the valve of the air supply system to the body of the product with two screws.
Flip the carburetor over and move on to assembling the fuel system. First you need to install the gasket.
Install the carburetor cover.
Install the main membrane.
Install the plate with the manual fuel pump button and tighten the four screws.
The carburetor is assembled and ready for further operation.
For the first time, repairing a lawn mowing carburetor may seem like a complicated process, but if you have to disassemble it a second time, then this procedure will not cause any particular difficulties.
If you have not found any of the listed problems in your carburetor, it is recommended to seek help from a specialized service.
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.
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.
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.
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".
Video (click to play).
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.
