Every owner of a chainsaw may encounter problems when using it. The tool refuses to start or stalls during operation. Service center specialists can easily detect the problem and ensure uninterrupted operation of the mechanism. But if it is not possible to go to a workshop or you just want to save money, you can find out the reason and restore the functionality of the tool yourself.
The reason for the chainsaw stopping in the midst of work may be:
- poor quality of components and entire units;
- unskilled care;
- use of low-quality fuel and oil substitutes;
- illiterate operation.
The distance from service departments and the high cost of the repair services provided force owners of failed tools to restore their functionality on their own.
This option is only possible after the warranty period has expired. The difficulty lies in the fact that traces of dismantling of individual components and assemblies noticed by service specialists may be the reason for refusing free repairs of more complex and expensive parts.
Benefits of DIY repairs
Experts offer several search options - the reasons for poor engine starting or if the power unit stalls during operation. The recommendations are equally valid for household and professional-grade chainsaws.
Owners with experience in operating chainsaw equipment use simple, time-tested, intuitive troubleshooting algorithms, which allows them to quickly eliminate many failures and breakdowns directly during operation.
The success of the work is facilitated by knowledge of the design of the tool and the interaction of all its components, the presence of plumbing and repair skills and operational experience. These same abilities allow owners to use their chainsaw equipment with high efficiency.
Self-repair provides the opportunity to significantly save material resources and reduce forced downtime.
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Mechanical problems
A sudden stop of the chainsaw can be caused by jamming of the piston in the cylinder or destruction of the crankshaft bearing due to oil starvation or poor quality of engine oil.
In the first case, the functionality of the tool can be restored by pouring a few drops of engine oil into the spark plug hole. Elimination of damage to the crank mechanism requires complete disassembly in a well-equipped workshop.
Elimination of fuel equipment failures
A simple analysis of failures and malfunctions shows that most of them are due to unqualified tuning of the fuel system. Upon closer examination, it turns out that the reasons for the situation when the engine does not start, does not pick up speed and stalls are practically the same.
In most cases this is:
- air leakage due to loosening of screw fasteners or destruction of the crankshaft oil seal;
- contamination of jets;
- float valve leakage;
- Wear of the booster pump seal.
The saw stalls after releasing the gas
Here you need to adjust the carburetor and check for strong air leaks.
We have already seen the most common cases of chainsaw breakdowns. All that remains is to make sure that your saw will serve without breakdowns. But even such durable models as Shtil and Partner can sometimes fail.
Do not rush to immediately run to the service center, first use my advice, this way you can avoid large financial costs.
If you found the article interesting, share the tips with your friends via social networks. And I say goodbye to you. Good luck and see you again on the blog!
Signs of characteristic failures
If the saw engine does not pick up speed and stalls, does not develop power and stalls under load, there is most likely a lack of fuel or incorrect carburetor adjustment.
The list of possible causes includes contamination of the fuel filter or air intake filter element, too rich or lean gasoline-air mixture.
Signs of the engine running on a rich mixture:
- slow acceleration;
- smoking from the muffler;
- reduction in traction characteristics and excessive fuel consumption.
The chainsaw stalls when you press the gas - most likely the mixture is too lean.
Air filter dirty
It is quite easy to verify that the air filter is dirty. You just need to remove it and start the chainsaw without it - if the saw works normally, then that means it’s the problem and you just need to change it or wash it, depending on its type. And don’t be afraid that the chainsaw will work for some time without protection from dust - if there is no dust cloud around you, then everything is in order.
So, remove the air filter. To do this, you need to remove the cover from the top rear part of the chainsaw, which is attached either with screws, or simply with some kind of fastener that you just need to turn or snap off.
If the saw operates normally when the filter is removed after starting, it means it is dirty.
The air filter can be felt or nylon. The first resembles cotton wool or padding polyester, and the second looks like a fine mesh of nylon threads stretched over a plastic body. The felt one needs to be replaced with a new one, but the nylon one can simply be washed in soapy water, dried and put back in place.
Nylon filterFelt filter
Well, we can continue to calmly use the chainsaw.
A simple way to determine the quality of the mixture
The easiest and most affordable way to check the quality of the mixture is the central spark plug insulator. A brown color of any intensity indicates proper carburetor adjustment.
The consequence of working with a rich mixture is the formation of black soot on the insulator, while a lean mixture manifests itself as a pure white or light gray insulator.
If, after normal starting and warming up, a fuel-filled saw periodically stalls during operation, it is recommended to eliminate the vacuum in the gas tank by cleaning the breather. The cause of unstable engine operation may be condensate water that has entered the carburetor float chamber.
Turning off the engine in operating mode
Alternatively, if the chainsaw heats up and stalls, troubleshooting should be done in the carburetor settings or in the high-voltage circuit of the ignition system unit.
When it overheats, the spark disappears or becomes so weak that its power is not enough to fully ignite the fuel-air mixture.
The engine also stalls when hot if the anti-interference resistance, which is located in the tip of the spark plug, is faulty.
What to do
If a malfunction is detected, you can try to fix it yourself. If you can’t fix the device yourself, contact a specialist. The technician will inspect the device and make professional repairs. This will avoid the risk of damaging the instrument when trying to repair it with your own hands. Methods for eliminating dysfunctions depend on which part turned out to be faulty, causing the saw to malfunction.
If the chainsaw starts and immediately stalls, the cause is often a lack of fuel. You should monitor the amount of fuel liquid in the gas tank and refill the device in a timely manner.
It is important to operate the tool correctly, following the instructions. Using a chainsaw for other purposes may impair the quality of the cut and lead to breakdown or damage to the device.
New equipment can be difficult to start even with an easy start system. After some time, this problem resolves itself. If a person has doubts about the serviceability of the device, it is recommended to consult a specialist.
The chainsaw engine turns off after reaching maximum speed
The power unit stalls at high speeds due to the performance characteristics of the electronic unit not meeting the stated requirements. Failure is more typical for budget chainsaws made in China.
The reason for refusal may be:
- lack of fuel mixture in the float chamber due to valve sticking;
- clogging of the fuel filter or the breather located in the fuel tank cap.
The power unit also stalls at high speeds due to a dirty air intake filter. The same symptoms are typical for a situation where the chainsaw started up in standard mode and stalled during the warm-up stage.
Setting up the fuel system
Qualified carburetor adjustment allows you to bring the power unit to a combination of maximum traction parameters and economical fuel consumption.
The success of the work is facilitated by preliminary cleaning of the air intake filter, warming up the engine to operating temperature, and performing adjustments in the sequence specified in the instructions.
The result of correct carburetor adjustment is:
- rapid acceleration without the “failure” characteristic of a lean mixture when accelerating sharply;
- absence of increased smoke from the muffler;
- stable idle speed.
Why does the engine go into overdrive? Ways to solve the problem and recommendations
Sometimes the engine spontaneously increases speed. Values can reach the maximum possible. This situation is not under control in any way. The driver may not even immediately understand what happened. This phenomenon is very dangerous. Diesel engines are especially susceptible to it. Many experienced diesel drivers call them “devil engines,” although in fact this situation is called differently. Gasoline engines with this “behavior” behave in the same way as diesel engines. Experienced drivers in such cases say that the engine has gone to pieces. Let's find out what causes the engine to spin and how to deal with this problem.
Non-standard failures
If a normally operating chainsaw engine stalls when the tool is tilted to one side, you should open the gas tank cap and eliminate the freezing of the flexible fuel receiver.
Almost the entire range of Chinese chainsaws is, to a greater or lesser extent, copied from popular models of European origin, so the design differences are minor. The recommendations given can be used if a Chinese chainsaw fails.
The maintainability of Chinese chainsaw equipment has been increased due to the unification of the repair stock and the interchangeability of many components and parts with similar models.
