The trimmer stalls – how to fix the problem
Why the trimmer stalls. What to do when the mower shuts off when you press the gas, at high rpm, at idle speed, immediately after turning it on or when the air damper is opened, when it is heated, under load. Operating rules and prevention of breakdowns.
If stalled without gaining momentum
If the trimmer does not pick up speed and turns off, there may be several reasons. The most common culprit is a clogged air filter. It must be pulled out and cleaned, if necessary replaced.
Another possible malfunction is related to the mechanics of the motor drive. This part of the trimmer must be thoroughly cleaned and the inner cables must be lubricated.
You also need to make sure that the cable in the carburetor has not slept. Before using the trimmer for the first time, check this structural element to ensure that it is firmly tensioned, but not tight. Failure to do so may cause the cable to crack, resulting in costly repairs.
If it stalled when opening the damper
If the equipment works properly at idle, but stalls when the air damper is opened, this indicates the penetration of air into the system through cracks in the fuel supply hose or damaged oil seals. In order to fix the breakdown and adjust the operation of the tool without sucking air from the atmosphere, it is necessary to replace the damaged parts.
Another possible cause of a breakdown is a malfunction of the carburetor dosage system. To fix this problem, it is better to contact the professionals.
If stalled after gas supply
Owners of gasoline scythes often mention that the lawn mower stalls when you press the gas. Typically, such a breakdown occurs due to a malfunction in the carburetor. Failure in its operation can occur due to prolonged storage, use in difficult conditions, significant overload of the motor. Vibrating movements of the device during operation will become a symptom of such a breakdown.
Sometimes the trimmer stalls when you throttle because the fuel valve is clogged. This interferes with the supply of gasoline. To fix the problem, it is enough to loosen the valves. This will restore the normal fuel supply to the carburetor.
Another possible reason the mower stalls when gas is applied is a dirty breather (check valve). This part prevents the formation of a vacuum in the gas tank. If it is clogged, air does not flow, which means that fuel does not go to the carburetor. To fix the problem, you need to clean this element.
Lawn mower stalls
When purchasing a lawn mower, you need to be prepared for the fact that, like in all other similar tools, breakdowns may also occur in it that will require repair.
However, you should not immediately run to the service center and pay a lot of money to the masters who convince you that there is a serious malfunction in the device.
The lawn mower stalls at high speed on gas
Perhaps the most common complaint with petrol trimmers is the lawnmower stalls.
Of course, a rather serious malfunction can also be the reason for this. However, in most cases the situation is much simpler than it seems at first glance.
To cope with such a problem, first of all, try to figure out its causes on your own, because after finding out the cause, it is much easier to deal with the problem, and sometimes it even self-destructs.
In fact, there are many reasons for this when the lawn mower stalls at high speeds.
Another is the presence of faults in the power supply system.
In this case, the lawn mower will stall at idle speed. A misalignment or incorrect adjustment of the carburetor can lead to problems with the power system.
The misalignment can be caused by vibrations that occur during the operation of the lawn mower.
Incorrectly adjusted lawn mowers can be corrected simply by adjusting it in accordance with the requirements specified in the instruction manual.
In addition, sometimes gasoline trimmers can stall due to the fact that the valve located in the gas tank cap is simply clogged or stuck.
To find out, try using a scythe while loosening the gas cap.
If the device works properly in this mode, clean the valve.
What’s more, the lawn mower can stall due to poor fuel flow to the carburetor.
Why, then, does the device start up, you ask?
The reason for this is that at first the fuel gradually runs into the carburetor and there is enough fuel to operate at increased power.
However, then it is produced and at high revs the engine starts to stall.
As for the carburetor, the problem here may also be that its body is too tight.
Air leaks can also be the reason for the lawn mower stalling at high rpm on gas.
This is the possible presence of a place through which air can pass during the heating process of the engine.
Be sure to check the fuel inlet hose, among other things. The problem may be that it is loose or cracked altogether.
These are the main reasons why a lawn mower can stall.
Immediately after wound up
The unit may stall immediately after starting if the carburetor is misaligned or incorrectly adjusted – this causes an uneven fuel supply. The result of this is that the device vibrates distinctly. For troubleshooting, the carburetor is reconfigured, following the instructions for the mechanism.
Also, the engine stops when the fuel supply valve becomes clogged. In such cases, it is sufficient to simply clean it. If the mower started working at first, but then immediately stalled, then it is possible that the fuel enters the carburetor unit with some difficulty. Weakening the valve helps to resolve the issue, which ensures free circulation of the mixture in the system.
The stoppage can also be caused by air leakage in the presence of mechanical damage to the hose (holes, cracks) that takes the fuel. In this case, add more revolutions to the drive in order to quickly expel air bubbles from the system.
What could have broken
Problems with the lawn mower due to the fact that this device does not start are classified in a certain way by service specialists. They highlight faults with the following components of the mechanism:
- An engine in which the piston and bearings may wear out or fail, crack the crankcase;
- The fuel supply system, while the filter may be clogged or problems with the carburetor;
- Mechanical damage to wires, tubes, hoses;
- Ignition circuit.
When you press the gas
If the lawn mower stops when the throttle is pressed, the reasons may be as follows.
- The most common scenario is carburetor adjustment failure, which occurs when the drive is under significant stress, after prolonged inactivity of the mechanism, or when it is used in difficult conditions.
- Clogging of the fuel valve, which is eliminated by loosening it, as a result of which gasoline begins to flow normally through the system.
- Loosening and drooping of the cable in the carburetor. The fuel hose can also be stretched to the point of rupture due to significant stress.
- Clogged breather (non-return valve), as a result of which fuel does not flow into the tank.
If the problem is related to the carburetor unit, then it can be recognized by the appearance of vibrations of the lawn mower.. When the hose bursts or the cable is stretched, these components are replaced.
complex reasons for lawn mowers failure
If the step-by-step troubleshooting algorithm does not work, and your scythe still does not start or stalls, it is worth inspecting the carburetor and the engine itself. A clogged carburetor can be one of the reasons for erratic tool performance. There are three main problems here:
- Clogged ducts or nozzles. All this is cleaned by special washes or blown by a powerful jet of compressed air from the compressor. Do not use needles and wires, as the bore may be damaged;
- Worn carburetor gasket. Exit – replacement of a failed gasket;
- Violation of tightness. To check this indicator, you can use an ordinary household tonometer, replacing it with a suitable pressure gauge. Watch the readings: if they do not change, everything is fine, and if the pressure starts to drop, then some part of the carburetor is faulty. We’ll have to find it and replace it with a new one.
If everything is in order with the carburetor, then the petrol trimmer may not start due to wear of the piston group. If chips, scratches or scuffs are found, the piston or cylinder should be replaced. Piston rings are subject to mandatory checks. A small backlash of the piston when rocking the connecting rod indicates that it is time to change the rings. It is best to entrust this procedure to the specialists of the service center.
How to start diagnosing lawn mowers
If the lawn mower does not start or immediately stalls after starting, it is necessary to sequentially check all the main components and assemblies. The verification algorithm is as follows:
- Fuel tank (fuel quality);
- Candle and candle channel;
- Air filter;
- Fuel filter;
- Outlet channel.
These nodes are most often the source of major problems that can be eliminated after a thorough inspection.
Breather and exhaust port
Often, "gentle" branded lawn mowers do not start and stall due to a dirty breather. The main function of this element is to equalize the pressure in the gas tank. When this unit becomes clogged, a vacuum is created in the tank, which prevents the supply of fuel. You can eliminate the malfunction by cleaning the breather. You can use a regular needle for cleaning.
Normal operation of streamers with internal combustion engines can be disrupted due to dirt entering the exhaust channel or a clogged silencer mesh. There is such a problem on older generation models. The issue can be resolved by traditional cleaning and removal of the anti-spark grid.