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.
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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 regular 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 disassembling so that you can see everything, 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 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?
In specialized gardening equipment stores, a carburetor kit for a brush cutter 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 wear parts of the carburetor can be replaced. Therefore, you should not rush and buy a new one, and you do not need to run to the workshop either, repairs are within the power of any brushcutter user. Professionals claim that the quality of the components in the repair kit even exceeds the characteristics of the native carburetor parts. Therefore, a well-repaired unit will perform 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 prolonged operation, the rubber corrodes and it begins to stick together or, under the influence of low temperatures, for example, during storage, it bursts. The button should also be replaced if necessary.In addition, its cost is small and will not affect the size of the repair budget in any way.
Based on the foregoing, it can be concluded 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.
Assembling a brushcutter carburetor is a snap. All actions must be performed in reverse order:
Install a spring and a needle valve in the carburetor cover. Hold the spring with your finger and tighten the mounting bolt.
Screw the shutter of the air supply system to the product body with two screws.
Turn the carburetor over and go to the fuel system assembly. First you need to put the gasket.
Install the carburetor cover.
Install the main diaphragm.
Install the plate with the manual fuel pumping button and tighten the four screws.
The carburetor is assembled and ready for further use.
The first time repairing a brushcutter carburetor may seem like a complicated process, but if you have to disassemble it a second time, then this procedure will not cause much difficulty.
If you did not find any of the listed problems in your carburetor, it is recommended to contact a specialized service for help.
Trimmer repairs should be carried out as soon as possible at the first sign of breakage so that minor faults do not lead to more serious problems. All models are characterized by the presence of such main nodes and structural elements : drive system (engine), transmission devices, working part (knife or line), belts and handles. Failure can occur in any part, but some components fail much more often than others.
Motor-cutters running on gasoline or electricity (as well as different models from different manufacturers) differ in design and the nature of the problems. Some of them can be easily eliminated with your own hands, while others will require more overhaul or contacting a service center.
The most common are breakdowns of a petrol cutter associated with such structural elements:
engine (in particular with a piston system);
carburetor;
barbell;
starter (rope breakage, breakage or spring disengagement);
with an ignition or fuel supply system;
transmission mechanism (reducer);
filters and a silencer.
The symptoms are as follows:
the appearance of uncharacteristic sounds during operation of the brushcutter;
the petrol cutter does not turn on, does not pick up the required speed, or stalls;
when the engine is running, the working part does not rotate or slips;
gasoline leak;
excessive heating of individual units.
Also, minor breakdowns may occur, which are detected without any special diagnostics:
sinking of the start button;
falloff of the limiter;
line breakage or breakage (loss of sharpness) of the knife.
Minor faults are not difficult to fix. Repairing the gasoline trimmer in more difficult cases will require preliminary diagnosis to find out the exact reasons. If you have the appropriate knowledge and skills of locksmith work, then the problems can be eliminated by yourself, replacing the failed parts.
To disassemble a petrol cutter for repair work, you will need, in general, the following devices:
a set of screwdrivers (with different tips) and wrenches;
small puller for removing bearings;
special candle wrench;
hammer.
In each case, you will need to disassemble the individual units.
It should be borne in mind that the starter (launcher) in a number of models is non-separable - in this case, in case of problems with it, only the replacement of the element is possible. If the assembly is disassembled, it can be repaired by removing and replacing the rope and spring, or reinstalling the latter (when it is disengaged).
It is quite common to repair the trimmer bar.It is a structure of the following parts:
a drive shaft made of steel, having polyhedral or square splines at the upper and lower ends;
aluminum tubes;
a plastic sleeve designed to maintain the centralized position of the drive shaft in the tube (so that there are no vibrations);
a rubber shock absorber needed to connect the rod to the motor;
steering wheel with a handle used for steering and a rack, a belt.
On some models, a shock absorber is located between the steering column and the boom. Everything control elements (lock lever, ignition switch, gas button) are located on the handle.
A bevel bevel gear is attached to the lower end of the boom, but some lightweight models are available without it. This is due to the fact that the bar has a curved shape, and the shaft is a flexible cable.
How to disassemble the rod and then assemble it to lubricate the shaft or replace it is shown in detail in the video below. In the same way, replace the broken barbell with a new one.
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It often happens that the polyhedral or square splines of the drive shaft "lick", while the operating mechanism does not rotate or does it with a slip. Then the shaft is changed.
When appears knock on the phone , you should disassemble the rod and check the condition of the bushing, and, if necessary, replace it. How to properly assemble the throttle on the trim is discussed in the video below.
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If the rod is not intact, suitable for installation, then you can tighten the place of the break with a clamp or apply a kind of tire. This is a temporary measure and should be replaced as soon as possible.
When a knife or fishing line, when the engine is idling, almost constantly turns, and uncharacteristic sounds emanate from the front of the engine, this indicates a breakdown of the clutch. The reason is a broken spring. In this case, the technique mows normally.
If slipping occurs, then, in addition, the pads are worn out.
The trimmer clutch is repaired as follows:
remove the cover from the muffler;
remove the metal stand;
then remove the cylinder and starter caps to gain access to the clutch;
unscrew the side screws to remove the shock absorber cover;
remove the tube from it, after letting the tightening bolts;
unwind the clutch (shown in the photo below);
inspect the condition of the spring, pads and bearings;
the new spring is hooked by threading the hooks into the corresponding holes;
to replace the pads, you need to remove the spring, and then unscrew the bolts on them.
If necessary lock the crankshaft using, for example, a rope.
Engine problems can be caused by problems with the piston system, oil seals, rings. To eliminate them, it is necessary remove the drive motor .
Determining what exactly caused the breakdown is not easy. If there is a guarantee, the mechanism should be taken to a service center for diagnostics and repair. If it is not possible to turn to specialists for help, then it should be borne in mind that replacement of piston rings is most often required. To do this, you need to disassemble the engine, get the piston. This is done in the following sequence:
remove the cover of the plastic case by unscrewing the screws or wringing out the clamps;
disconnect the bar with the crankshaft;
remove the cylinder head;
take out the piston and rings;
if necessary, replace them;
assemble in reverse order.
Rings should be installed carefully because they are fragile.
How the piston is placed and what happens replacement of oil seals when carrying out engine repairs, it is clearly shown in the videos below:
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With regular use, the brushcutter can break down gear ... Gears and bearings wear out in it (they can also break).To prevent this from happening often, this unit should be regularly lubricated. The frequency is almost always indicated in the operating instructions for the model used (at least once a season). The video below can serve as a repair manual.
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To lubricate the gearbox , you should unscrew the plug and simply squeeze out a suitable lubricant inside the unit, turning the shaft.
The carburetor can only be removed and cleaned on your own, and the gasket between it and the engine can be replaced. The tightness of the assembly at home is quite problematic to determine. The main thing is to correctly assemble the equipment after repair so that the trimmer works without problems.
Electric trimmers differ from gasoline devices in a more simplified design. Conventionally, the electric braid is divided into mechanical and electrical part ... Accordingly, the same groups of problems that occur with this equipment are distinguished.
Most breakdowns cannot be visually detected. To do this, you need to use various devices. You can visually determine the following:
the integrity of the power cable is broken (the insulation has been torn from it, or it is clearly broken);
sinking or jamming of the start button;
external mechanical damage to the brushcutter;
problems with the cutting part;
stopping the spit when clogging with grass;
damage to the plug.
To find out which part has broken in other cases, you will need to disassemble the electric brace and consistently check the most likely options. At the same time, attention is paid to the external manifestations of deviations from the normal operation of the device. They help to establish the cause.
Repairing an electric trimmer will require the following devices and tools:
indicator screwdrivers;
multimeter or tester;
soldering iron;
a set of keys;
screwdrivers with different attachments.
Electric braids often do not work due to reasons not directly related to them, but caused by a decrease in the supply voltage in the network or an inoperative state of the outlet used.
Before disassembling and repairing the electric braid, you should check the condition of the outlet and the voltage in the network. If its value deviates from the norms specified in the operating instructions, then you should not even try to work with the device without stabilizer rated for the corresponding power. Otherwise, the motor may be damaged. Only after determining that the reason for the failure of the trimmer is directly related to it, you can begin to analyze the mechanism for repair purposes.
Disassembly of the electric braid in order to repair its electrical part is carried out in the following sequence.
Place the trimmer on a flat surface (such as a table) that does not contain unnecessary items.
Unscrew the cover screws located on one side.
Remove the unscrewed half of the case, gaining access to the start button, electric motor, brush assembly, bearings, electrical connections (these elements are shown in the photo below).
Disassembled electric trimmer
The brush and bearing units are shown in the photo below.
The braid will work and without thermostat , you just need to constantly independently check the temperature of the electric motor, periodically letting it cool down. You can also install a new, similar sensor.
The start button of the electric motor can be checked by closing a jumper of its contacts ... If the trimmer works, then the problem is clear. But this option is unsafe. Everything should be done carefully so as not to get an electric shock. To change the button, use a screwdriver to remove it from the seat and connect the wires from the old to the new one. After replacement, you need to assemble the electric brace, and then check its performance.
Replacing brushes required if they have collapsed.In this case, pull out the old ones from the grooves, and install the new ones in their place.
The connection terminals on different trimmer models are almost identical, so the connection and disconnection of the wires is the same.
Bearing replacement is a rather difficult operation, because it can stick and not be removed from the motor shaft. Pull or knock it down carefully to avoid damaging the rotor or seat.
Bearing for trimmer ET1003A
When the trimmer motor fails and needs to be replaced with a new one, carefully remove the fan and bearings and then reinstall them. In terms of costs, replacement is almost comparable to purchasing a new mechanism. In the absence of experience with electric motors, it is better to entrust it to specialists.
Instructions for assembling the electric part of the brushcutter are as follows:
install the engine by tightening the mounting screws;
connect the electrical circuit;
lay the wires neatly between the separate compartments in the existing grooves;
close the top cover by snapping the locks and screwing it in.
After assembly, the operability of the device is checked.
There are a lot of possible breakdowns for gasoline and electric trimmers. For the device to be functional for a long time, it must be kept clean and dry. An important point is carrying out regular preventive measures (e.g. lubrication of the gearbox) and the observance of the operating rules set forth in the instructions for the device. Purchase equipment of better quality from well-known manufacturers.
When disassembling the mechanism, it is recommended to photograph the process in stages so as not to forget anything, and not to miss a single detail during assembly. When replacing parts, pay attention to the selection of suitable components: it is better to use original spare parts.
In some models, the rod consists of two parts - a coupling is used to connect them. Such devices are convenient for transportation.
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The benzokos is one of the main tools of the summer resident, used to quickly put the land in order. Owners of private houses also purchase this tool for mowing grass in the backyard. The period of active use of petrol cutters and electric trimmers is in the summer. Before starting operation, the tool is put into working condition: rubbing parts are lubricated, the cutting attachment is changed, a 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 repair a petrol brush with your own hands, you need to understand its structure and the principle of operation of the main units. This information can be found in the instructions for use, which the manufacturer applies to the garden equipment without fail. Check for such a guide when purchasing your chainsaw. The imported tool must be accompanied by instructions written in Russian.
A long tubular rod is attached to the gearbox of a two-stroke internal combustion engine. A shaft passes inside the rod, which transfers torque from the gasoline engine to the cutting mechanism. The line or knives rotate at 10,000 to 13,000 rpm. There are holes in the protective housing of the gearbox, into which grease is injected with a syringe. For the convenience of using the tool, the manufacturer equips it with a special adjustable shoulder strap.
A cutting attachment is attached to the brushcutters:
The line, which varies in thickness from 1.6 to 3 mm, is located in the trimmer head. The line is subject to wear during mowing.Changing the line is quick and easy in two ways: by winding a line of the same diameter onto a bobbin or by installing a new spool with line already wound.
Steel knives with double-sided sharpening for the benzokos for clearing the area from weeds, small bushes, hard grass. Knives differ in shape and the number of cutting surfaces.
On the U-shaped, D-shaped or T-shaped handle, which is attached to the boom, there are the petrol cutter control levers. The cutting mechanism is protected by a special casing. Household brushcutters are filled with a mixture prepared from gasoline and oil, which is poured into the fuel tank. The device of semi-professional and domestic brushcutters, equipped with a four-time gasoline engine, is slightly different. The filling 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 spool and start winding in the direction indicated by the arrow
If you cannot start the petrol cutter, then the first step is to check the presence of fuel in the tank and its quality. For refueling the tool, it is recommended to use high-quality gasoline purchased at gas stations, the grade of which should not be lower than 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 brushcutter itself. It is equally important and correct to prepare the fuel mixture from gasoline and oil. The proportional ratio of these components of the mixture is indicated by the manufacturer in the manual. It is not necessary to prepare the fuel mixture in large volumes, since its properties are lost during long-term storage. Better to use a freshly prepared mixture.
When preparing the fuel mixture, pour oil into gasoline using a medical syringe, which allows you to accurately observe the required proportion of components
A dirty fuel filter in the tank can also prevent the brushcutter from operating. Therefore, if problems arise with starting the motor, check the condition of the filter. Replace the filter if necessary. Do not 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. Then the part is installed in place. The removed cover is put back and secured with screws.
The air filter, washed in a fuel mixture, wrung out and dried, is installed in place in a plastic case and closed with a lid.
You can see how this procedure is done in more detail in 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.
Place the tool on its side with the air filter at the top. This arrangement of the chainsaw ensures that the fuel mixture hits the bottom of the carburetor. The engine will start on the first attempt if you remove the air filter and pour a few drops of the mixture into the carburetor before starting, then reinstall the dismantled parts. The method has been tested in practice.
If the first tip doesn't work, then the problem is most likely in the spark plug. In this case, unscrew the plug and check its functionality, and also dry the combustion chamber. Replace the candle that does not show signs of life with a new one.
If the spark plug is in good working order, the filters are clean and the fuel mixture is fresh, then you can use the universal method of starting the engine. Close the carburetor choke and pull the starter handle once. Then open the choke 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 petrol cutter 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 assembled.
Stop the engine and wait for it to cool down.
Disconnect the high voltage wire from the spark plug.
Unscrew the part using a special wrench.
Inspect the spark plug for replacement. The part changes if it is faulty, heavily soiled, has a crack on the case.
Check the electrode gap. Its size should be 0.6 mm.
Tighten the new spark plug inserted into the engine with a wrench.
Install the high-voltage wire to the center electrode of the spark plug.
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 streamer is installed to replace the old part that is out of order
After starting, the engine may stall if the carburetor is incorrectly tuned or misaligned. What are the signs that you can understand that the reason really lies in this? It is very simple, by the vibrations that will be clearly felt when the mower is running. You can adjust the fuel supply with your own hands by following everything that is written in the operating instructions for the tool.
The engine may stall due to a clogged fuel valve. The cause is eliminated by cleaning it. If the brushcutter starts up and then suddenly stalls, it means that the fuel supply to the carburetor is difficult. Loosen the carburetor valves to ensure that the correct amount of fuel can flow to it.
Excessive air intake can also stall the engine. Increase engine revs to allow air bubbles to escape faster from the unit's fuel system. Also, be sure to check the integrity of the fuel intake hose. If you find mechanical damage (cracks, punctures, etc.), replace the part.
During the period of operation of petrol cutters, monitor the condition of the engine cooling system. The channels in the starter housing and the cylinder fins must always be clean. If you ignore this requirement and continue to operate the brushcutter, you can damage the engine due to overheating.
Competent care of the gasoline scythe during operation allows you to use it for several seasons in a row without major repairs
Allow engine to cool before cleaning. Take a soft bristled brush and clean the outside 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 brushcutter must be prepared for long-term storage. For this, the fuel mixture is drained from the tank. The engine is then started to use up fuel residues in the carburetor. The entire tool is well cleaned of contamination and goes to "hibernation".
Video (click to play).
As you can see, it is possible to repair the faults of a household petrol cutter on your own. It is worth contacting service departments in case of serious breakdowns. In this case, the cost of repairs should be correlated with the price of a new petrol cutter. It may be more appropriate to buy a new instrument.
The upper part is considered the main one - the main elements of the brushcutter are concentrated here: the starter, the carburetor and the engine;
