Causes of power loss in the brushcutter. Lawn mower does not develop full power
Anyone who owns a dacha or a plot of land, is well aware of the problems of dealing with excess vegetation. Now the grass trimmer has come to the aid, which has successfully replaced the usual scythe in this field. This unit is very easy to work, but he, like any mechanism, because of the harsh working conditions or incorrect operation peculiar to fail. Situations when the grass trimmer does not pick up speed are quite common. To understand this problem, it is necessary to understand some aspects related to the functioning of the device.
All grass trimmers are classified according to the type of power: gasoline or electricity (from the network or battery). It should be noted that gasoline mowers are superior to their electric and battery-powered counterparts in many respects. Despite the fact that they all perform similar functions, the difference in performance, maneuverability, and efficiency is very noticeable. However, the general principle of operation of all types of manual mowers is almost the same. the devices are equipped with engines (two- or four-stroke combustion engines or electric motors), which drive the cutting unit (spool with a fishing line or a metal disc). All elements are mounted on a straight or curved boom, including the trimmer’s control handle, which holds the main buttons.
Since the problem of weak revolutions is more characteristic of gasoline versions of trimmers, they will be given more attention. Thus, lawn mower is very comfortable in operation and unpretentious in service. At the same time, most of its faults are caused by the user’s ignorance of the elementary things that are written about in the manual. Before operating the machine, therefore, it is important to carefully read the manufacturer’s instructions. In particular, to start the engine, you must do the following sequential steps:
- switch on the ignition button;
- Press the silicone button several times to pump the gasoline;
- Close the choke;
- the throttle lever to the high rpm position;
- first make light jerks with the starter grip to feel the engine resistance, then yank sharply.
If the lawn mower starts but stops, you must put the choke in the middle position and try again. When the engine starts to work, you need to take off the gas and open the air damper, as the grass trimmer works only on the suction.
Important! The operation of the grass trimmer depends on various environmental influences. In hot weather, you need to give the unit more time to cool down. When working in dense thickets or high vegetation, the engine also overheats a lot. It is necessary to take five-minute breaks every 15-20 minutes.
Causes of the grass trimmer’s weak revolutions
If users complain about the grass trimmer, which does not pick up speed, it means that at idle it works fine, but when you press the gas does not develop the necessary power. This can occur as a result of long idle time without activity. These problems are typical for gasoline machines, including Husqvarna 128r, STIHL FS 38 and Hitachi of various modifications.
Working with a trimmer, you need to watch its behavior all the time. the drop in rpm and unusual noises signal about malfunctions in the machine. Sometimes you give the gas and the grass trimmer floats. In such cases, the work should immediately suspend, let the mechanism cool down and begin to search for possible problems. They can be of a different nature, both technological plan, and external factors associated with the conditions and characteristics of the operation of the machine.
External factors
Several factors, unrelated to the mower’s failure, have an impact on the decrease in lawnmower speed:
- Contamination of the filter due to ingress of dirt particles and dust;
- the use of low-quality fuel;
- incorrectly mixed mixture (important for trimmers with two-stroke gasoline engines);
- contamination of the muffler screen with particles of vegetation, soil and other objects.
In the second and third cases, there is the formation of carbon deposits in the combustion chamber and clogging of the carburetor elements.
Technical faults
Technical problems with the lawnmower mainly take place in the fuel supply and ignition system. You can cope with them yourself.
- When the hand mower won’t start or stalls, the problem could be related to the spark plug. Dark soot indicates poor carburetor adjustment and poor quality gasoline.
- The cause of incorrect operation of the grass trimmer can be a clogged fuel hose. Filters are also often clogged.
- Another internal problem. the muffler is covered with soot. This causes the grass trimmer’s RPM to drop drastically. The solution is to clean the muffler.
Important! If the machine doesn’t run because of an engine failure, there can be serious problems. In this case, the malfunctions that can be eliminated with your own hands include only the destruction of piston rings. For more serious problems with the engine, if there is no warranty, you should be prepared to visit a workshop.
Why the lawnmower stops: Causes and solutions
There can be many reasons why your tool sharply stops working, namely, the engine revolutions are not picked up, breaks them, or “collapses” in the popular way. Often not only the engine itself is to blame, but also related systems, units of the unit, completely other parts related to the preparation of the fuel-air mixture, its quality, transportation to the engine tool. Consider the most typical situations:
- It won’t pick up speed. The mechanics of the engine drive may be damaged or there may be problems with the carburetor, but the main reason is that the air filter is clogged. To change the situation, you need to remove it, clean it, and if the last it is no longer available, then replace it with a new one, quickly make an order on our website. Also the revolutions of the mower for grass will not gain, if the cable from the carburetor constantly comes off. disassemble the unit and firmly fix it, or buy a new one, if cracks or other types of deformations are found on the element.
- At high revs. The cap on the gas tank is clogged. you need to clean it or buy a new one. often the cause is a disbalanced carb. We give information about the correct adjustment of all screws in the informational articles. Check the quality of the fuel intake hose and replace it with a new one if necessary.
- When heating. Occurs at moments when the fuel in the carburetor is literally boiling. Can also appear in the variants, if the flap of the carb more rare, rotary type (not disc). The only option would be to replace the carburetor with a new one. There is also the possibility of a broken wire or ignition coil. In this case, change the element of the last.
- Starts and stops (right after starting). Over-adjusted or improperly adjusted carburetor is the main cause of this situation. Distinct vibration will indicate an uneven fuel supply, and competent adjustment of the unit will help to correct the situation.
We hope you have found the right answer to the question: why the lawnmower stalls, and all the suggested parts of the catalog today, as always, are at your service. Do you need a grass trimmer piston, a new carburetor, or related to the work of these systems. you will find everything on the expanses of the store “Benzo Zip”.
Diagnose malfunction
All the reasons why the lawnmower does not start can be classified according to the specifics of the individual components. In the service center malfunctions are systematized:
- Engine trouble (piston wear, bearing damage, cracked crankcase);
- Fuel supply malfunction. clogged air filter pores or carburetor malfunction;
- ignition system does not work;
- mechanical malfunction. leaking hoses, broken wires under the braid, broken tubes.
The user must first check that there is no fuel in the tank. Start in accordance with the instruction manual with the saw on its side. Set the choke shutter to the “close” position, pump up the fuel, switch on the ignition and give 3 to 4 jerks with the starter. STIHL STIHL 250 chain saw stalls, throttles on gas, works on full throttle. If the engine is running, open the air damper. STIHL 250 chain saw stalls when throttle, in what. The lawnmower does not start. repeat the operation with a slightly open air damper.
With a failed start, we start to find the cause of the failure:
- Check the quality of the fuel;
- check if the spark plug is working and the spark plug duct is clean;
- Check that the air filter is clean;
- check that the fuel filter is not clogged;
- check the breather plug for cleanliness;
- Clean the exhaust port.
complicated reasons will be, discovered during diagnostics, malfunctions leading to the carburetor overhaul. Such causes include clogging of the internal channels of the carburetor, wear on the gasket and violation of the tightness of the internal halls with a loss of vacuum. Repair of a lawn mower with their own hands, if it does not start, requires patience.
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Causes of failure and troubleshooting
In order to most accurately determine the cause of malfunction of any brand of grass trimmer (for example, Echo) and find out the possibility of its elimination, it is necessary to establish, when performing what action the device stalls. The engine can turn off both at idling and at high revolutions, after heating under load or right after start-up, etc.д.
If the lawn mower stalls after you apply gas
Owners of gasoline-powered mowers quite often mention that the lawnmower stalls when the gas is pressed. Usually such a breakdown occurs due to problems in the carburetor. Malfunction may be caused by prolonged storage, use in harsh environments, significant motor overload. Vibrating movements of the device during operation will be a symptom of such failure.
Just a side note! Users familiar with automotive carburetor repair can try to repair this important grass trimmer assembly on their own, using the operating instructions. If this is not the case, the best thing to do is to ask for help from a service center.
Sometimes the grass trimmer stops when you throttle because the fuel valve is clogged. It prevents the supply of gasoline. To fix the problem, it is enough to loosen the valves. That will restore the carburetor’s normal fuel supply.
Gasoline grass trimmer Starts And Stops
Why the grass trimmer gasoline does not start? Causes and remedy
Recently, the gasoline trimmer for grass has acquired the status of one of the main tools in the arsenal of dacha. And this is not surprising, because a motorized grass trimmer allows you to quickly bring the garden plot in order. However, sometimes it happens that the grass trimmer does not start on hot and even on cold. In such situations, we have to independently establish the cause of the malfunction. Let’s find out what to do if your petrol grass trimmer won’t start. The causes that most often lead to such troubles will be discussed below.
Troubleshooting strategy
How to start troubleshooting, if the grass trimmer does not start? In situations where the tool stalls immediately after starting, it is worth inspecting the following nodes of the unit:
It is the breakdown of the above-mentioned locations that most often leads to the fact that the grass trimmer starts badly. Let’s take a look at how to eliminate such troubles.
Checking the fuel mixture
Suppose you do not start your grass trimmer. In this case, the first thing to do is to check whether there is enough fuel in the tank, as well as to assess the quality of the fuel mixture. It is necessary to fill the motorized machine exclusively with high-quality gasoline. It is recommended to use fuel, which brand is not lower than Ai-95. Filling the grass trimmer with fuel of unknown origin, bought not at the filling station, is fraught with the occurrence of frequent failures in the work of the tool. It can cause failure of the cylinder-piston system. Repair in such a case often exceeds the cost of the device itself.
Why won’t the grass trimmer gasoline start?? It can also lead to it may be incorrect preparation of the fuel mixture, which consists of oil and gasoline. The proportions in which these components are combined, are specified by the manufacturers in the grass trimmer manual. Preparing a fuel mixture is highly discouraged in large volumes, that is, for the future. After all, if it is stored for a long time, the defining properties of the substance are lost. Therefore, if the grass trimmer does not start, it is worth to drain the old fuel and use a freshly prepared fuel mixture.
READ Which Grass Trimmer is Better Rotary or Vibratory
Diagnosis of the plug channel
What to do if the fuel mixture used is fine, but still does not start the grass trimmer gasoline? The causes of mechanism failure may lie in excessive moisture in the spark plug channel. To make a diagnosis and fix the problem, you need to do the following:
- Unscrew the spark plug. Wipe it thoroughly and then dry it.
- Drain the excessive fuel in the chamber through the appropriate spark plug hole.
- Clean the old candle if there is soot on its surface. To cope with the task will allow the use of an ordinary nail file or nail file.
- When replacing the element, set the gap of 1 mm. To check the parameter, it is enough to place any coin in the gap.
- Reassemble the function module.
- Try to start the grass trimmer.
It is advisable to dry the spark plug duct for at least half an hour. However, by no means should you resort to burning its elements. After all, the heating of the spark plug can lead to its final deterioration. What to do if the function block has been serviced according to the above recommendations, but the grass trimmer does not start, but there is a spark? In such a case, it is worth to treat the threaded joint with gasoline. The last one does not need to be heavily impregnated with fuel. It should only be slightly moistened. This should be resorted to in order to ensure ignition. Because no matter how strong the spark did not give the spark plug, in a completely dry chamber is simply not something to ignite.
lawnmower stalls
Adjusting the carburetor, does not start badly
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the lawnmower stops or chokes when you press the gas
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If even in this case, the grass trimmer does not start, it is worth evaluating the quality of contact between the high-voltage wire and the spark plug. If there is no spark (if there is a reliable connection between the above elements), the problem is most likely caused by a broken ignition unit. In this situation, you will have to turn to the services of masters, who will perform the reinstallation of the node.
Checking the filters
Another common reason why the grass trimmer does not start is the presence of a clog in the filter area. To confirm the conjecture, it is enough to dismantle the specified block and try to start the unit without it. If the grass trimmer engine started, most likely you will have to replace the air filter or at least perform a thorough purge of the old one. If there is a lot of dirt on the surface of the filter element, you must use a new mesh. When resorting to such actions, you should not leave the suction pipe completely without a filter. In fact, a rush in this case can lead to the need to repair the entire piston group of the unit’s engine.
Cleaning the breather plug
Often the engine firm models trimmers glows as a result of clogging the breather. The main task of this component is to equalize the pressure in the fuel tank. If the node gets dirty, it creates a vacuum, making it very difficult to supply fuel. Cleaning the breather pipe with an ordinary sewing needle can solve the problem.
Diagnosing the exhaust port
Stable operation of grass trimmer can be broken as a result of a buildup of dirt in the exhaust channel or the formation of a clog on the grid muffler. Such a problem occurs most often during the operation of older trimmer models. The problem can be solved by removing the mesh and cleaning it.
How to prevent sudden malfunctions during the operation of the grass trimmer?
To ensure that the unit is always in functional condition, it is worth following a few simple rules:
lawnmower stops at high engine speeds
During operation, a situation arises when, when the fuel mixture key is pressed, the unit’s RPM begins to decrease rather than increase. Failure of this nature can be caused by:
Fuel hoses on brushcutter with filter
- Check the fuel system by blowing atmospheric air into the combustion chamber;
- Fuel mixture circulation problems;
- clogging of the breather plug in the fuel tank cap (cleaning the hole with a thin sewing needle);
- improper carburetor adjustment.
If the engine is leaking, check the tightness of connection pipes and the integrity of the gaskets of the cylinder block. Fuel mixture circulation problem may be solved by removing blockages in the fuel pipes leading to the carburettor. If there is a vacuum in the tank and the fuel mixture does not flow to the carburetor, it is enough to clean the breather hole with a fine needle and blow with air.
lawnmower doesn’t develop revolutions.Another cause of
the analog of Нuѕq51B↩varpan does not develop revolutions the reason was very simple (look in the video)
If the performed operations with the filter you have done, but the work of the trimmer for grass, working on gasoline, has remained the same, gasoline trimmer does not gain momentum what to do?
Then you should try to remove the filter from the device in order to provide a so-called “lightening” of the grass trimmer. Why the Chinese lawnmower does not develop speed, the reason Husqvarna. Should help.
The next and fairly common problem with a gasoline trimmer is that it just stalls, and gives no sign of life.
In this case, the problem may be as follows:
The last and most common cause of gasoline grass trimmer breakdown is that the cable, which is located in the carburetor department, just slept.
So make sure in advance that it is well stretched, but not to the limit, otherwise if too much load is put on the gasoline grass trimmer, this small cable can crack and then you will definitely have to go to a service center and then also throw a lot of money in the wind.
Immediately after starting the engine
The machine may shut down immediately after starting if the carburettor is misadjusted or has been improperly tuned. this causes irregular fuel supply. The result is that the device begins to vibrate distinctly. To correct the problem, the carburettor must be readjusted according to the instructions for the machine.
Also the engine stops when there is clogged valve. fuel supply. In such cases, it is sufficient to simply clean it. If the lawnmower initially worked, but then immediately stalled, it is possible that the fuel to the carburetor unit comes with some difficulty. The problem can be solved by loosening the valve, which allows free circulation of the mixture in the system.
Stopping can also be caused by air suction there is mechanical damage of the hose (holes, cracks) which is making fuel intake. In this case, you should add revolutions to the drive to kick air bubbles out of the system faster.
After heating up
the lawnmower often stops when it heats up. It starts, runs “jerkily” and stops gradually. This process occurs when the gasoline in the carburetor boils either the lawn trimmer has a rotary lawn trimmer and not a disc-type lawn trimmer. In the latter case, the part is replaced.
It happens that the grass trimmer gets warm if the ignition cable is damaged Or the coil. The air intake hose is cracked or not properly connected.
At high RPM
When the grasshopper stalls at high speeds, it is due to the following problems:
- a clogged or jammed valve located on the gasoline tank cap;
- the carburettor has become misaligned due to the vibrations produced by the machine;
- problems with the circulation of the fuel mixture;
- atmospheric air leakage;
- the hose intended for fuel intake is cracked or poorly connected.
The carburetor is adjusted, based on the operating instructions to the trimmer. It is often sufficient to loosen the tightening of the carburettor housing for adjustment. If there are problems with the circulation of the fuel mixture, the mixture may slowly flow into the carburetor. After it has run out, the engine stalls at high revolutions.
Malfunctions that lead to chainsaw malfunctions
There are a number of faults that need to be taken into account when diagnosing, i.e. к. they can cause the saw to malfunction.
- Worn crankshaft bearings. Worn out crankshaft bearings inevitably lead to runout on the main shaft where the handwheel is mounted. In such a situation, the gap between the flywheel and the ignition coil cannot be adjusted, which leads to interruptions in spark formation, and unstable operation of the chainsaw.
- Dirt in the impulse line. The pulse channel is used to make the fuel pump work, so its contamination leads to incorrect operation of the pump, which will make it impossible to work the saw (it will start and immediately stop).
- Wear of the cylinder head. As a rule, with increased wear of the CPG, there is a decrease in compression in the chainsaw engine, which is bound to affect its ability to develop revolutions.
- Contamination of fuel and air filters.
At high rpm
The hole in the fuel cap (breather valve) of grass trimmer
With a similar problem, it is worth paying attention to the fuel valve, which, if clogged, ceases to pass the fuel mixture normally. The way to solve this problem is to loosen it with a suitable tool. In addition, the problem with the circulation of the fuel mixture can be hidden in the contamination of the valve. For this purpose it is enough to blow it with a stream of compressed air.
- etching of atmospheric air into the combustion chamber;
- Problems with fuel mixture circulation;
- clogging of the breather plug in the fuel tank cap (cleaning the hole with a thin sewing needle);
- Improper carburetor adjustment.
At air drainage during the operation of the engine check the tightness of connections and the integrity of the gaskets in the cylinder head. The problem with the fuel mixture circulation can be solved by removing the clogging in the fuel pipes leading to the carburetor. If there is a vacuum in the tank and the fuel mixture does not flow to the carburetor, it is enough to clean the breather valve with a fine needle and blow it with air.
If the lawnmower stops when you press the gas, the causes may be.
- The most common variant is failure of carburetor adjustment, which occurs when there are significant loads on the actuator, after prolonged inactivity of the mechanism or when using it in harsh conditions.
- Clogging of the fuel valve, which is eliminated by loosening it, resulting in the gasoline in the system begins to flow normally.
- Loose and hanging cable in carburetor. Stretching or even bursting of the fuel hose caused by considerable force may also occur.
- Sucker plugs (check valve), which results in not getting fuel into the tank.
If the problem is related to the carburetor unit, you can recognize it by the appearance of lawnmower vibrations. When the hose bursts or the cable is stretched, replace these components.
When the grass mower stalls at high speeds, it is due to the following problems:
- clogging or sticking of the valve located on the gas tank lid;
- the carburetor has become misaligned by the vibrations produced by the mechanism;
- problems with fuel mixture circulation;
- Atmospheric air inflow;
- the fuel hose is cracked or loose.
The carburettor is adjusted according to the instruction manual of the trimmer. For adjustment it is often enough to loosen the tightening of its housing. If there are problems with the circulation of the fuel mixture, it can flow into the carburetor. After it is exhausted, the engine stops at high revolutions.
Most often, in the periods when the lawnmower stalls when adding gas, the cause will be the air damper, or rather, its condition: it is clogged. Structurally, the part is located in the place where the received fuel is atomized, and accordingly, the product collects all the inclusions in the low-quality gasoline.
- clogged air valve;
- A clogged fuel filter, and when you give gas, it’s especially noticeable;
- there is air leakage by the crankshaft oil seals;
- The gasket between the cylinder and the carburetor is damaged.
When you have cleaned, flushed and purged the elements, but again the lawnmower stalls when you press the gas. replace them with new ones, check the quality of fuel, as well as the literacy of the proportions of the mixture prepared. When the air damper is open, the tool will stall for the following reasons:
- Malfunction of the carburetor dosing system.
- Cracks in the fuel hose caused air leakage.
- The emergence of problems with oil seals.
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In the process of work, there are situations where the lawnmower at high speeds is subject to a similar abrupt stop. It occurs for the following reasons:
- Due to problems with the circulation of the fuel mixture;
- With an air sucker;
- The fuel intake hose is poorly connected or cracked and can not be operated;
- the gasoline tank cap valve is stuck or clogged;
- The carburetor is out of adjustment.
In most cases, though, the cause will still be the carburetor and related filters, hoses. If you need cutting gear or trimmer heads, then buy them also gladly offer our website gasoline tools and accessories.
Immediately after starting
The unit may stop right after starting if the carburetor is dislodged or not properly adjusted. It causes an uneven fuel supply. As a result, the device clearly vibrates. To correct the defects the carburetor is readjusted, following the annotation to the mechanism.
In addition, the engine stops if the fuel valve is clogged. In such cases it is quite easy to clean it. If the brushcutter at first worked, but then immediately stopped, it may be that the fuel with some difficulty getting into the carburetor unit. The problem can be solved by loosening the valve to allow the consistency to circulate freely in the system.
Also stop may be caused by air leaks in the presence of mechanical damage to the hose (holes, cracks), receiving fuel. In this case, increase revolutions of the actuator to remove air bubbles from the system more quickly.
Immediately after starting
The machine may stall immediately after starting if the carburetor is displaced or not properly adjusted. It causes an uneven fuel supply. As a result, the device clearly vibrates. To correct the defects, the carburetor is readjusted, following the annotation to the mechanism.
Not counting, the engine stops when the fuel valve is clogged. In such cases it is quite easy to clean it. If the hedge trimmer works at first, but then stops right away, it could be that the fuel is having some difficulty getting into the carburetor unit. The problem can be solved by releasing the valve, which allows free circulation of fluid in the system.
Stopping can also be caused by air leaks in the presence of mechanical damage to the hose (holes, cracks) receiving fuel. In this case, increase the RPM to quickly remove the air bubbles from the system.
Where to look for the cause or where to start checking
All gasoline-powered saws have the same design and operate on the same principle. You can read about the construction of a chainsaw in this article. It does not matter what brand of tool. STIHL, Husqvarna, ECHO, Champion, Partner, Sturm and others. The problem that appears in the form of a chainsaw stopping when you press the gas, can occur equally in expensive and high-quality tools, as well as in low-cost Chinese devices. If a problem has arisen, it must be solved.
A chainsaw is a system of mechanisms, made up of parts. Any part in the mechanism can fail, causing partial or complete failure of the tool. If the tool’s engine starts, it does not necessarily mean that the chainsaw is in good working order. When the engine stops working when the engine speed is increased, it means there are the appropriate reasons for it. At this malfunction it is necessary to pay attention initially to a number of the following mechanisms of the tool:
- Gas tank. Make sure you have fuel. If fuel is available in sufficient quantities, you should also check the serviceability of the fuel filter, the connection of the supply hose to the carburetor, as well as to make sure that the breather is working
These are the main parts and mechanisms, which should be checked first of all, if a malfunction occurs, when the gasoline lawn mower stops after the gas pedal is pressed. There are other reasons why a chainsaw engine stalls when the throttle trigger is pulled. What else can contribute to this malfunction, as well as features of troubleshooting, we will clarify further.