What to do if the chainsaw is dead?
Many chainsaw owners know the weakest points of their tool, but a situation may arise when the cause could not be immediately found.
Also, this manual will be useful for those who recently purchased a chainsaw.
ATTENTION! If you did not find your reason in the list below, you could ask your question in the comments.
So, the chainsaw has died down. The reasons may be quite a lot, because even saw and not a car “Formula 1”, but it is a technical device. Here the primary condition for successful repair will be an accurate diagnosis of the fault.
You should not immediately begin disassembling the chainsaw, and you first need to check the most simple possible causes of a malfunction. Consider the approximate steps to verify the possible cause of a breakdown.
If the chainsaw stalls for no apparent reason and it is not possible to establish even approximately possible malfunctions, then it is worthwhile to go through consistently for all possible reasons. Of course there are typical, standard malfunctions which we will discuss below, but for now, let’s go step by step!
Check the fuel mixture.
First, it should be prepared according to the recommendations of the manufacturer and using high-quality components. Secondly, produce a full tank or drain the fuel mixture before a long idle or conservation between seasons. Read more about fuel here:
Clean or change the air filter.
Contaminated air filter does not allow to supply air in the volume on which the normal operation of the chainsaw is designed. That is if the carburetor that mixes air and the fuel mixture has been adjusted with the same amount of intake air, then when the air filter is contaminated, the number of air decreases and the settings remain the same, and the result is an enriched working mixture.
Check the candle.
There may also be several sub-items. The first step is to unscrew the spark of the chainsaws and check if it was flooded during the start-up attempts. Especially often, this occurs when the inexperienced users start the chainsaw, who do not follow the sequence of starting the saw on the cold one. In this case, you need to dry the candle or screw in a new one and try again according to the instructions. The tip of the candle may fail. You can check this by unscrewing the candle and inserting it into the tip, put it on the block and pull the starting cord a couple of times. If there is a spark, then both the candle and other electrics are in order.
Another step to check the spark is to check the gap on the candle and for the presence of carbon. For clearance, see manufacturer recommendations. As a rule, it is from 0.5 to 0.65 millimeter.
Nagar from a candle is cleaned with fine-grained sandpaper or a metal brush. Read more about candles here:
Check the fuel filter.
As with the air filter, the situation with the fuel filter leads to a change in the composition of the working mixture. Only if the air is contaminated, then the mixture becomes richer, and when the fuel is contaminated, on the contrary, the mixture becomes poorer. Work with an insufficient amount of fuel in the working mixture engine chainsaws will not. Also, when the fuel filter is clogged, the uniform supply of fuel to the carburetor and further to the combustion chamber is disrupted. It is especially noticeable when the chainsaw stalls when you press the gas.
Check the breather.
The breather is a non-return valve, which is located in the gas tank of the chainsaw and prevents the formation of a vacuum in the tank. If it is clogged, the air is not supplied instead of the used fuel mixture, and the fuel pump cannot cope with the fuel supply.
It often happens that when a primer (fuel pre-pumping pump) was pumped into the carburetor, the chainsaw started up. After the fuel supply in the carburetor has been consumed, and because of the clogging of the breather, the fuel is not supplied the chainsaw stalls.
Checking the carburetor.
In 50% of cases, if not, even more, the reason that the chainsaw stalls is an incorrectly tuned or failed carburetor.
What malfunctions can a carburetor have?
- Jets clogged, nozzles, filter channels. With the “quality” of domestic fuel, the fuel filter often fails to cope with the duties assigned to it to clean gasoline from dirt, debris, and impurities. In this case, the nozzles are clogged, and the fuel is either supplied in insufficient volume or not supplied at all. Often the chainsaw at the same time noticeably loses in power. It is necessary to disassemble and clean the carburetor. Remember that the carburetor consists of small and very small parts! Therefore, before disassembling thereof, prepare a place in advance!
- The accelerator pump needle sinks. Often, as a result of wear or the ingress of foreign objects, the needle of the accelerator pump can “sink”. In this case, the chainsaw may not start, operate unstably, or stall for no apparent reason at any time.
- The check valve needle is loose on the seat. In this case, it will flood the candle, and the saw will work unstably or stall under load. Grinding the needle to the valve seat is very difficult! It is often easier to replace the carburetor
- Worn or damaged rubber cuff in the accelerator pump. If there are cracks on the cuff or it has been damaged, for example during parsing, then additional airflow will begin (“leakage”). It, in turn, will lead to an increase in speed at first, and then the chainsaw will stall. It only needs to replace the cuff.
- Sometimes it happens that it starts to “suck in” air from under the carburetor gasket. Determining exactly where the “leakage” is often very difficult, and in this case, you may have to change all possible oil seals and gaskets.
Checking of hoses, glands, gaskets.
One of the most common problems due to which the chainsaw stalls or does not start is air leakage. Saw air could be sucked in many different places. Check in order:
- Fuel hoses. Often, from time to time or when using low-quality materials, micro, and not micro, cracks can form in fuel hoses. You can identify them in most cases by visual inspection. It is also worth exploring the place of attachment of hoses. If the hose does not fit snugly, then there may be a place of suction.
- Glands. Even the best-quality oil seals can lose their tightness under the influence of time and during operation. In this case, the quality of the mixture is disturbed, and the saw either works unstable or starts and stalls. How to check the chainsaw seals? There are only two of them, and both are installed on the crankshaft. To check their tightness at home, I know two options: 1. Check them using air supply under pressure. It can be done with a compressor, better stationery, but you can use the car. It is necessary to block all openings, namely the output from the side of the muffler and the input from the side of the carburetor. Unscrew the candle and supply air under pressure. If the pressure is not created or you hear a hiss, then this is a clear sign that the glands need to be changed. 2. You can check it with a special device. on the video:
- Gaskets can also cause air leaks. Most often they are damaged when unqualified repair chainsaws. If you recently assembled and disassembled your saw, then there is a very high probability that air leaks arose as a result of damage to the gasket, or its incorrect installation.
As a result of long-term work, especially if the fuel mixture is prepared with excess oil in the muffler, deposits are formed that prevent the free discharge of exhaust gases. In this case, it is necessary to clean the muffler.
Failure of the cylinder-piston group (CPG).
Perhaps this is the most unpleasant of breakdowns that are possible in a chainsaw. Often the cost of replacing a CPG can exceed the cost of half of the entire chainsaw! It is especially true of professional models. In our case, when we consider the reasons why a chainsaw can stall trouble, tears on the walls of the cylinder and piston can cause trouble. You can check this by removing the muffler and inspecting the surface of the cylinder and piston visually. In most cases, teasers happen just from the side of the muffler, but sometimes the opposite can be the case. Keep this in mind!
Be sure to produce all gasoline before storing the chainsaw for the winter or just for a long time. Properly dilute gasoline with oil (more on this).
Here, perhaps, are the main reasons why a chainsaw may stall. In case these recommendations did not help you, describe the symptoms in the comments. We will help!
Chainsaw stalls when you press the gas.
One of the most common questions. In this case it is necessary:
- Check the fuel filter.
- Inspect the fuel hoses for tightness.
- Check the silencer.
- Try to add a little twist XX.
- Look at the rubber glands on the crankshaft, the spacer between the carburetor and the cylinder.
Chainsaw stalls “hot”.
If a chainsaw starts up well before it is warmed up, and after it warms up, it starts to stall and does not start up until it cools, then the problem may be as follows:
- Check whether there is a leak (hoses, seals, gaskets)
- See the muffler on the subject of soot.
- Check the cylinder head (cylinder-piston group) for scoring.
- Check carburetor settings
- It is still possible that the ignition coil is out of order. When the saw heats up, the resistance increases and the spark either gets lost or becomes so weak that its power is not enough to ignite the mixture.
Chainsaw stalls after releasing the “gas”.
In this case, either adjustment of the carburetor is required, or somewhere there is a powerful suction of air.
Chainsaw throws fuel into the air filter.
Requires repair or replacement of the carburetor.
Chainsaw stalls under load.
If your saw starts up well, works both at idle and adding “gas”, but it is hardly worth giving a load to stalls,
then the following steps should be taken:
- Check fuel filter
- Adjust the carburetor
- Check hoses, gaskets and gaskets for leakage.
- Check clutch operation
Chainsaw stalls after a while.
In this case there can be two reasons:
- Air leaks
- Breather plug in gas tank