Husqvarna 137 chainsaw stalls under load

Chainsaw stalls under load

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husqvarna, chainsaw, stalls, load

The chainsaw can operate normally in a straight, horizontal position, but stalls when leaning sideways. This is usually also associated with a lack of fuel: the fuel pipe rises when tilted, and if there is not much fuel, then it rises above the fuel level.

Problems associated with improper operation of the fuel system

The chainsaw periodically stalls at idle speed also due to a violation of the integrity of the fuel line or an incorrect ratio of the ingredients of the “fuel mixture” consisting of gasoline and oil.

Before each switching on of the cutting mechanism, it is necessary to visually inspect its blocks and assemblies, paying attention to possible defects in the surface of the body, mechanical damage, and leaks of working fluids. This also applies to the saw fuel line, which is usually a rubber tube.

If the device was (especially for a long time) in a damp place and it had to withstand sharp fluctuations in air temperatures, this tube could simply crack. Such a fuel line is not suitable for further use and should be replaced.

Another reason why a chainsaw at idle speed can stall is the non-observance of the ratio of ingredients when preparing the “fuel mixture”. The proportions of gasoline and oil included in it must exactly correspond to the proprietary instructions for a particular device. If they are not observed, the engine will not lubricate sufficiently, and the entire mechanism will stall persistently.

Checking the main systems of the chainsaw

If the chainsaw refuses to work normally, you need to make sure in such a cut that our client is provided with the conditions required for its production activities:

Then it is necessary to sequentially check the functioning of all its elements. First you need to check the fuel tank. If the reason is not in volume, not in the role of fuel, then the likely cause of the malfunction is the spark plugs. The gap at the candle should not exceed 0.5 millimeters. If it is too small, it means that carbon deposits have been deposited on the candles. Then you should remove the candles, clean them, then install in the area do not try to start the chainsaw. Today, it is advisable to sometimes completely replace the candles with new ones, even if they are in good condition.

Then you need to check the condition of the fuel filter not the carburetor. Self-cleaning of the fuel filter is a simple task, however, it is preferable to entrust the repair of the carburetor to specialists.

To adjust the carburetor, you need to find two bolts with the letters L not H. The main reasons why the chainsaw stalls when loaded with hot and cold. Troubleshooting methods for idle and load operation. The latter needs to be turned, slightly, only half a turn. He is responsible for the revolutions of the tool, if necessary, he will raise the idle speed.

Why the chainsaw isn’t picking up steam and stalls

If the chainsaw is unable to rev for a minute after starting, or if it stalls when the trigger is pressed, the carburetor or crankcase is most likely not sealed. As in the previous case, the problem can be solved by checking for leaks and adjusting the carburetor.

If the chain saw does not rev and stop after normal operation for about 5 minutes, a defective fuel tank vent may be the cause. The vacuum created in the fuel tank while the tool is running prevents the engine from receiving the necessary amount of fuel for its normal operation, and for this reason it will not be able to gain momentum or stall. In this case, if you stop the tool, open and close the fuel filler cap and start the chainsaw again, the tool will run normally for about five minutes again, after which it will stop revving or stop.

The reason the chainsaw is not gaining strength may also be excessive carbon in the muffler, making it difficult for the exhaust to escape, thereby reducing power and engine speed.

If you want to check the crankcase for leaks, but there is no special tool, you can use the following test method.

Substandard carburetor operation

If it turns out empirically that the filters are clean and the ignition system is not to blame for the fact that the chainsaw is not capable of functioning at idle, the owner of the tool is advised to switch his attention to the carburetor.

It is necessary to disassemble and assemble the carburetor without haste, since it has many parts without which it cannot work.

Often the misalignment of this unit, which is responsible for supplying a certain volume of the air-fuel mixture to the engine cylinder, leads to unstable operation. It can be adjusted with three special screws located on the carburetor: screws for maximum and minimum speed, as well as a screw that controls idle speed.

Some manufacturers, fearing unwanted interference from incompetent people, supply their products with only one idle screw. But in both cases, carburetor adjustment can be made only by strictly following all the manufacturer’s instructions.

However, even after adjusting the carburetor, in accordance with factory standards, this unit can junk. Then it is recommended to clean the fuel and air channels, jets, mesh of the filter element. If the membrane is damaged, it must be replaced with a new and high quality one.

When doing maintenance and repair of a carburetor, you should always remember that it is usually crammed with many very small parts, without which the device simply cannot work normally. Therefore, the carburetor should be disassembled and reassembled without haste and with extreme caution.

Turns off under load

Diagnostics begins with checking the carburetor, not the crankcase, for leaks. If the passage for detecting air leakage through the crankshaft oil seals requires replacement. If air leakage in the carburetor is detected, the installation of a repair kit of gaskets is required to solve the problem.

If these actions did not lead to the desired result if the engine crankcase with the carburetor is not tight, then the carburetor needs to be adjusted.

If under load the chainsaw stalls Husqvarna, in case of any deviations in the functioning of the motor, you should first check the impulse hose, since this is the most common cause of breakdown of this brand of chainsaws.

Why does a chainsaw stall under load

In some cases, the chainsaw under load is unable to work normally and simply stalls. A common reason for this behavior is improper carburetor adjustment, or air leaks through the crankshaft oil seals or carburetor gasket. And also this behavior can occur due to leaks in the carburetor.

It is best to diagnose the cause and eliminate the fact that the chainsaw starts and stalls under load, best of all in a service center, since a special tool is needed to check the tightness of the carburetor and crankcase.

A saw that is unable to operate under load will also be unsteady at idle speed. They will “float”. Diagnostics begin with a check for leaks in the crankcase and carburetor. If air leaks through the crankshaft oil seals, they must be replaced. If air leakage is detected in the carburetor, the cause can be eliminated by installing a repair kit of gaskets.

Only after the above actions have not yielded results and the crankcase with the carburetor is sealed, you can start adjusting the carburetor.

The reason for this algorithm is as follows, if the air leak from the crankcase is not eliminated, but the carburetor was simply adjusted to normal engine operation, then the fuel mixture will contain more fuel than is required with a sealed crankcase, which in turn will significantly increase its consumption. Also, most likely, carbon deposits will appear in the engine, which will also negatively affect the further operation of the chainsaw.

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In some models of chainsaws, to ensure the operation of the fuel pump, special hoses are installed that transmit an air impulse from the engine crankcase to the carburetor fuel pump. If this hose is frayed, the saw will idle unevenly and will not work at all under load.

Owners of HUSQVARNA 137 and HUSQVARNA 142 household chainsaws should first of all check the impulse hose for any deviations in engine operation from the norm, since this is considered the most common reason for the breakdown of these chainsaws.

A video showing how to replace a defective impulse hose with your own hands on a HUSQVARNA 142 chainsaw can be viewed below. It shows step by step the process of disassembling the saw, shows the impulse hose and stipulates the consequences of its malfunction HUSQVARNA 142.

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Owners of chainsaws sometimes have to deal with the fact that the saw, for no apparent reason, stops working normally. To understand why the chainsaw stalls under various operating modes, and also to describe how you can diagnose a malfunction, we will try in our article.

Husqvarna 137 chainsaw stalls under load

Why does the chainsaw start and immediately stall

The chainsaw starts up and immediately stalls, the reason for this behavior may be hidden in the carburetor. A malfunctioning fuel pump or malfunctioning of the main fuel jet can cause this saw to behave like this. The inability to operate the chainsaw after starting, requires a full diagnosis at the service center.

All of the above options for engine malfunction have similar causes, which, depending on their neglect, can have different manifestations. For example, with a slight intake of air into the crankcase of the engine, its work will not change much, the engine power will drop slightly, its maximum speed will increase, and it will be able to heat up a little more. In the middle stages of air leakage, the engine will stop idling and will get very hot during operation. Strong air suction, will make it impossible for the saw to work, it will start and immediately stall.

In parallel with the visible manifestations of malfunctions, for example, the inoperability of the chainsaw after starting, processes will take place inside the engine at the time of its malfunctioning, which irreversibly lead the saw to the most serious consequences, for example, melting the piston, jamming the crankshaft.

The main causes of chainsaw breakdown

Although the chain saw is a simple device, from time to time, problems arise in its operation, which can only be fixed by disassembly. The following malfunctions can be cited as examples:

  • the chainsaw is not picking up speed;
  • the chainsaw stops functioning in the cut;
  • the chainsaw starts and stalls;
  • the chainsaw loses its power;
  • the chainsaw stalls when pressed.

Most often, malfunctions are associated with interruptions in the functioning of the motor, as well as malfunctions of other systems and components. Proper handling of this technique is essential. When all the rules of use are followed, problems with a high probability lie in the most obvious. When looking for the causes of problems, it is advisable to start by checking the simplest part of the chain saw and finish the most difficult.

Algorithm for checking the crankcase for leaks

  • Remove the side cover and tire from the chainsaw.
  • Unscrew the spark plug and put a lace with knots into the cylinder through the spark plug hole, thereby stopping the movement of the piston and crankshaft.
  • As a lace with knots, you can use the old cord from the starter, tying knots on it every 3-5 cm.
  • Spin the chain saw drive sprocket.
  • Remove the oil pump cover and the pump itself.
  • Remove the starter from the chainsaw.
  • Unscrew and remove the flywheel.
  • Remove carburetor.
  • Using a syringe, through the carburetor hole in the cylinder, pour gasoline into the crankcase, while observing the crankshaft oil seals. If gasoline flows through them, then the oil seals have become unusable and must be replaced with new ones.
  • It is better to entrust the installation of oil seals to professionals.

An indirect sign of crankcase leaks are oil leaks in the area of ​​the oil seals.

The chainsaw starts and stalls. the reason

If the chainsaw starts and stalls at the first attempts to do the job, then the reason may be problems with the chain brake or its jamming due to lack of lubrication. In this case, the oil level is measured. If the amount of lubricant is sufficient, then the cause may be in the tube that leads it to the lubricating mechanism.

Another reason may be a broken carburetor. If he only needs adjustment, it can be done independently in accordance with the instructions. If the carburetor needs cleaning or repair, then you cannot do without the help of professionals.

Another possible cause of this malfunction is a low fuel level in the tank. In this case, the saw stalls when tilted, since the remaining fuel mixture ends up in the part of the tank opposite to the place where the suction tube is located.

Why does a chainsaw stall when heated

The situation in which a chainsaw starts up cold, and in the process of heating it can stall, is familiar to many who deal with them. The main reasons for this behavior of the saw are as follows.

  • Defective ignition module (coil). Determine the malfunction by checking the spark first on a cold engine, and then on a hot one. If there is no spark on a hot engine, then it is worth trying to fix the malfunction by replacing the ignition coil.
  • The carburetor of the chainsaw has an incorrect setting (fills a hot candle). You can determine the problem by how the saw is started on a cold one. If for a cold start it is not required to close the air damper, and the engine starts without a preliminary flash, then the fuel mixture is formed incorrectly and after the engine warms up, the fuel fills the spark plug and makes it impossible to start. The problem is eliminated by adjusting the carburetor.
  • Spark plug defective. In such a situation, similar to a faulty ignition coil, the spark disappears when the engine heats up. It is worth trying to replace the spark plug with a new one, and if this does not help, then you need to check the ignition coil and the gap between it and the flywheel.

You can check the ignition coil using a multimeter or by replacing it with a known good one. The test with a multimeter of the primary and secondary windings is carried out in the resistance measurement mode. The resistance index of the primary winding, working coil, is 1 kOhm. secondary 4 kOhm.

Chainsaw stalls when rpm increases

The reasons for this phenomenon are similar to the previous ones: either the problem is in the fuel system, or in the air filter. Try to disconnect the fuel hose from the carburetor. if the gasoline does not flow well (but you know for sure that there is fuel in the tank), then the reason is in the gasoline filter. You can, at the same time, check the fuel pump. fuel should not seep through it. If this happens, then it is advisable to replace the pump.

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Idle problems due to faulty muffler

In the event of a noticeable drop in the power of the internal combustion engine at idle mode, after which the car often stalls, it is necessary to remember to check the muffler. The fact is that the specified unit may be heavily clogged with resinous particles and combustion products of the spark extinguisher falling out on the walls of the muffler in the form of thick deposits.

As a result, the resulting impermeable layer interferes with the normal exhaust gas emission. This situation must be corrected without fail. Simple repair of a clogged muffler is carried out as follows.

Cleaning the muffler with a dry cloth is not allowed, as carcinogenic carbon particles can enter the respiratory tract.

The muffler is removed from the engine, disassembled (if this type of muffler can be disassembled). In this case, it is necessary to plug the remaining holes from under the muffler.

The entire unit and its individual parts are thoroughly washed with a cloth soaked in water and detergents. If the muffler is collapsible, wait for all its parts to dry completely. The non-collapsible unit is dried using an ordinary household hair dryer. Cleaning this device with a dry cloth is not allowed, otherwise carcinogenic particles that form carbon deposits may enter the respiratory tract of a person.

As a preventive measure for the normal functioning of the muffler of two-stroke internal combustion engines in the “fuel mixture” of chainsaws, it is recommended to use only high-quality oil and only that which is prescribed by the manufacturer of this unit.

The engine cannot withstand loads

If the chainsaw stops right in the middle of a particularly thick log, the problem may be caused by a problem with the fuel supply system or problems with the air filter. The engine just doesn’t get enough fuel to handle a heavy load, and it stalls.

The usual solutions to these problems are replacing the fuel in strict accordance with the recommendations in the instructions (we have already talked about this) and cleaning (replacing) the air filter.

Fuel and air filter problems and solutions

The chainsaw will shut off at idle speed if the fuel or air filter becomes clogged. To find out the condition of the first element of the fuel system, disconnect the gas line from the carburetor. If, during pumping, fuel is supplied in doses that correspond to the specified standards, then the cause of the malfunction should be looked for elsewhere. If gasoline enters the carburetor weakly or does not flow out of the hose at all, then, most likely, the filter is clogged with debris.

To clean it, remove it from the tank (all the fuel must be drained from the tank until this moment). Extraction takes place through the filler neck of the tank using a wire hook. The filter is disconnected from the suction hose. If possible, clean the filter. If this is not possible or it is impractical to do it for a number of reasons, the used filter is changed to a new one.

The chainsaw may stall if the fuel filter becomes clogged.

The air filter can also be clogged with dirt or dust, resulting in malfunctions at idle. It should be remembered that clogging of this filter occurs quite often, as a result of which the flow of air into the system is difficult. The proportion of gasoline in the fuel-air mixture increases, and it turns out to be too rich. In this case, normal engine operation should not be expected.

For cleaning, the air filter is removed with special care so as not to shake off the dust into the carburetor. Then it is cleaned and washed thoroughly. Detergent is added to the rinsing water. After drying, the air filter returns to its place in the chainsaw.

For normal operation of the cutting tool, it is recommended to change the fuel and air filters every 3 months.

Why the chainsaw stalls

There are several reasons why a chainsaw stalls. And, as a rule, almost all of them are solved independently, without going to the service center.

First of all, check the filters: fuel and air. If they are clogged, then, for sure, this is the reason for the improper operation of the tool. over, the dirt is not always visible to the naked eye. Therefore, even if everything seems to be in order, it is better to carry out this procedure.

The second reason is possibly a candle. Remember the last time you changed it? According to the rules for the operation of chainsaws, this should be done once a year.

If this does not help, then it is worth trying to adjust the carburetor. It is possible that vibrations when working with a chainsaw lost its factory settings.

If the saw stalls after long-term storage, for example, in an unheated garage, then it is worth looking at the fuel line. Usually, this is a rubber tube, which can crack from dampness and temperature extremes and cause the chainsaw to malfunction.

If none of the above helped, then, most likely, the breakdown is more serious, and, unfortunately, you will have to contact the workshop.

Substandard carburetor operation

If it turns out empirically that the filters are clean and the ignition system is not to blame for the fact that the chainsaw is not capable of functioning at idle, the owner of the tool is advised to switch his attention to the carburetor.

It is necessary to disassemble and assemble the carburetor without haste, since it has many parts without which it cannot work.

Often the misalignment of this unit, which is responsible for supplying a certain volume of the air-fuel mixture to the engine cylinder, leads to unstable operation. It can be adjusted with three special screws located on the carburetor: screws for maximum and minimum speed, as well as a screw that controls idle speed.

Some manufacturers, fearing unwanted interference from incompetent people, supply their products with only one idle screw. But in both cases, carburetor adjustment can be made only by strictly following all the manufacturer’s instructions.

However, even after adjusting the carburetor, in accordance with factory standards, this unit can junk. Then it is recommended to clean the fuel and air channels, jets, mesh of the filter element. If the membrane is damaged, it must be replaced with a new and high quality one.

When doing maintenance and repair of a carburetor, you should always remember that it is usually crammed with many very small parts, without which the device simply cannot work normally. Therefore, the carburetor should be disassembled and reassembled without haste and with extreme caution.

Chainsaw stops idling

First, it is recommended to check the muffler, as its contamination can lead to a deterioration in the exhaust gas output, which is why the engine stops.

If cleaning the muffler does not solve the problem, and your saw engine is carbureted, then you can try to tune it. Most engine models have coarse and fine adjusting bolts (H and L respectively). By increasing the engine speed with their help, the problem can be eliminated. Keep in mind that adjusting the carburetor is a delicate process that requires a tachometer.

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Why does a chainsaw stall when heated

It often happens that the chainsaw starts up on a cold one, but stalls during the heating process. This behavior of the tool can be caused by the following reasons:

  • The carburetor is incorrectly set. You can identify this problem by how the device is started up on a cold one. If it is performed without closing the air damper, and the engine starts without a preliminary flash, this means that after heating the engine, the fuel fills the candle. The solution to this problem is to adjust the carburetor. Details on carburetor adjustment
  • Coil (ignition module) malfunction. This problem can be identified by sequentially checking the spark, first on a cold, and then on a hot motor. If there is no spark on a hot engine, then you need to replace the ignition coil.
  • Defective spark plug. In this situation, as in the case of a malfunction of the ignition module, the spark disappears when the engine heats up. It is necessary to replace the spark plug with a new one, and if this does not lead to a solution to the problem, then the ignition module and the distance between it and the flywheel should be checked.

Why the chainsaw stalls, the main reasons.

The main causes of chainsaw breakdown

Although the chain saw is a simple device, from time to time, problems arise in its operation, which can only be fixed by disassembly. The following malfunctions can be cited as examples:

husqvarna, chainsaw, stalls, load
  • the chainsaw is not picking up speed;
  • the chainsaw stops functioning in the cut;
  • the chainsaw starts and stalls;
  • the chainsaw loses its power;
  • the chainsaw stalls when pressed.

Most often, malfunctions are associated with interruptions in the functioning of the motor, as well as malfunctions of other systems and components. Proper handling of this technique is essential. When all the rules of use are followed, problems with a high probability lie in the most obvious. When looking for the causes of problems, it is advisable to start by checking the simplest part of the chain saw and finish the most difficult.

The chainsaw starts and stalls. the reason

If the chainsaw starts and stalls at the first attempts to do the job, then the reason may be problems with the chain brake or its jamming due to lack of lubrication. In this case, the oil level is measured. If the amount of lubricant is sufficient, then the cause may be in the tube that leads it to the lubricating mechanism.

Another reason may be a broken carburetor. If he only needs adjustment, it can be done independently in accordance with the instructions. If the carburetor needs cleaning or repair, then you cannot do without the help of professionals.

Another possible cause of this malfunction is a low fuel level in the tank. In this case, the saw stalls when tilted, since the remaining fuel mixture ends up in the part of the tank opposite to the place where the suction tube is located.

Why does a chainsaw stall under load

Sometimes the saw will not function properly under load. This is most often caused by improper adjustment or leaks in the carburetor. In addition, air leaks through the carburetor gasket or crankshaft oil seals may be the cause of this problem. A tool that is unable to function under load also cannot maintain idle speed reliably.

Diagnostics begins with checking the carburetor and crankcase for leaks. If air leaks through the crankshaft oil seals, they need to be replaced. If air leakage in the carburetor is detected, the installation of a repair kit of gaskets is required to solve the problem.

If these actions did not lead to the desired result and the crankcase with the carburetor is tight, then the carburetor needs to be adjusted.

If a Husqvarna chainsaw stalls under load, then for any deviations in the functioning of the engine, you should first of all check the impulse hose, since this is the most common cause of breakage of this brand of chainsaws.

Why the chainsaw doesn’t pick up speed and stalls

If the saw cannot gain speed or stalls when you press the gas, then most likely this is caused not by the tightness of the carburetor or engine crankcase. This problem is eliminated by checking for leaks and adjusting the carburetor.

In addition, this malfunction may be associated with a defect in the fuel tank breather. Due to the formation of a vacuum in the fuel tank during the operation of the chain saw, the required volume of the fuel mixture does not enter the engine, as a result of which it cannot gain speed or stalls. If you stop the chain saw, open and close the fuel tank and turn it on again, it will work normally for about five minutes, and then it will stop picking up speed again or stall.

Another possible reason that the saw is not able to pick up speed may be excess carbon deposits in the muffler, which makes it difficult for exhaust gases to escape, which reduces the power and engine speed.

Checking the main systems of the chainsaw

If the chainsaw refuses to work properly, you must make sure that all the conditions required for its normal operation are provided:

  • fuel;
  • spark;
  • grease;
  • air.

Then it is necessary to sequentially check the functioning of all its elements. First you need to check the fuel tank. If the cause is not volume and quality of fuel, then spark plugs may be the likely cause of the problem. The gap at the candle should not exceed 0.5 millimeters. If it is too small, it means that carbon deposits have been deposited on the candles. In this case, remove the candles, clean them, then reinstall and try to start the chainsaw. In addition, it is advisable from time to time to completely replace the candles with new ones, even if they are in good condition.

Then you need to check the condition of the fuel filter and carburetor. Self-cleaning of the fuel filter is a simple task, but it is best to entrust the repair of the carburetor to specialists.

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What to do if the chainsaw stalls when you press the gas

One of the most common questions regarding the operation of this device: why does the chainsaw stall when you press the gas and what should be done to solve this problem? In such a situation, you need to do the following:

  • check the fuel filter;
  • inspect the fuel hoses for leaks;
  • check the muffler;
  • try to increase the speed a little;
  • check the condition of the rubber seals on the crankshaft.