Determining the cause of the malfunction
If the grass trimmer engine does not start or stops right after start, if the gearbox overheats, or if extraneous noises and vibrations are clearly felt during the operation of the device, it is important to perform a visual inspection and identify a non-working unit.
To optimize preparations, a simple diagnosis and step-by-step inspection should be performed before the repair:
- presence of fuel in the tank and grease in the main assemblies;
- serviceability of the spark plug and its performance;
- Cleanliness of the brushcutter fuel and air filter;
- clogging of the exhaust duct and breather of the device;
- the quality of fuel and lubricants used.
To determine the functional efficiency of the lawnmower ignition, you should determine whether the spark plug works by testing the appearance of the spark when it touches the body of the functional device.
The spark plug itself can be replaced with a new one, pre-drying the spark plug channel, if necessary, the old element is also dried, cleaned with special devices and returned to its place.
Grass trimmer won’t start. Why?
Gasoline grass trimmer is an amazingly useful thing, with the help of which you can, without any hassle, not only put in order a miniature lawn in the backyard of the house, but also to mow a considerable size lawn. But like all things in this world, it tends to break. In this article we will try to figure out what to do when the grass trimmer refuses to work.
Gasoline grass trimmer does not start well
So, what to do if gasoline grass trimmer does not start or does not start at all? The most common cause of such failure.It is a poor-quality fuel. Remember that, for example grass trimmer brands “STIHL” and “Husqvarna” unlikely to start on fuel quality below the AI-92. You should not skimp on fuel, because.к. Cylinder Parts Repair.Piston group can account for one-third of the total cost of a grass trimmer, and sometimes even half. Also, when preparing the fuel mixture, it is necessary to correctly observe the proportions of fuel and oil, which are always specified in the instructions to the trimmer.
What to do, if the gas tank is filled with high-quality fuel, there is a spark, but the tool still refuses to start? Check the condition of the spark plug. It is located in the center of the lawnmower housing. It should be carefully unscrewed and check to see if there is no plaque on it. If it’s still there, gently clean the spark plug of sludge and dry it.
If the lawnmower does not start even after the above suggestions, then you need to try removing the air filter and start the machine without it. If the grass trimmer still does not work, give the old filter a good dusting or buy a new one.
It also happens that the lawnmower runs for a maximum of 5 minutes and then shuts down and will not start until it cools down. In this case, try opening the filler cap of the gasoline header should appear suction sound. After that, screw the cover back on. If you do this while the weed trimmer is just starting to stall, the rpm will be restored and you can keep working. If the lawnmower stalls before opening the cover, you just have to start it up properly according to the instructions.
grass trimmer does not start after winter
What to do in this situation? No need to worry and panic. This is a very common problem, which is solved in literally 3-4 minutes. First of all, if there is last year’s fuel left in the gas tank, it must be drained. Gasoline loses its octave properties after an idle period of two weeks. Secondly, starting the lawnmower after a long stagnation should be done in a slightly different way. First you need to open the choke and pump a little fuel mixture into the carburetor, then pull the handle until you feel a slight resistance. Then you can start the weed trimmer.
The weed trimmer starts and stops
If your weed trimmer starts but immediately shuts down when you try to start it, the air filter may be to blame again. You need to remove it and check whether it is not clogged with dust. If this is indeed the case, it is necessary to perform a thorough cleaning or to buy a new. The problem can also be a problem with the ignition coil. If this is the case, it is better to take the mower to a service center.
Here everything is simple, a few basic points for any engine: what would work the engine needs good compression, its absence will not start the engine. The next thing to check is the ignition, without a spark there will be no ignition. A clogged fuel system will make it difficult to supply fuel, and a dirty exhaust system also makes it very difficult to start the motor.
That’s probably the main thing to check. The most popular repair scheme. elimination method. That is, in order we cut off the options for faults, I will tell in detail:
Failure of the piston group
On all two-stroke machines that are brought to us, the first thing we check the scuffing on the piston and cylinder. You can do this by unscrewing the 2 bolts of the muffler and removing it, shine a light into the exhaust window. If the piston is smooth and the rings are springy. it is good if the piston is damaged or the rings are stuck and caked. this is not acceptable. The cause of the failure is overheating, old fuel mixture or lack of oil in the solution. The only panacea. Complete overhaul with piston replacement.
Troublesome ignition of trimmers
Next, check the spark by leaning the spark plug on the mass and cranking the starter properly. If there is no spark, disconnect the wires from the coil to rule out the switch. We do all operations only with new plug. dried, hardened, wiped plugs are NOT good. There are also cases when the spark disappears when the engine is hot and does not appear until it cools down. Also possible bad contact of the cap and the high-voltage wire. If the spark does not appear, the ignition coil must be replaced.
Contamination of the fuel system
If everything is OK with the engine and the spark, let’s try to start the engine. We recommend spraying a carburetor cleaner in the combustion chamber, under the spark plug or in the carburetor window. The engine will start and will most likely stall, repeat the procedure several times. If all else fails, you must try carburetor cleaning. We do not recommend you do it yourself, because of the presence of small parts or lack of them due to inexperienced repair. Fuel system clogged, that’s the most common problem.
Unfortunately cleaning carburetor is not a cure-all and it is not always possible to clean it completely. Even ultrasound and a good cleaner can be helpless. Also often the following things fail in carburetors: the needle, check valve, gas pedal valve, diaphragms, needle and seat. Some may say that there is nothing to break, but the carburetor of your chainsaw is structurally more complicated than the carburetor of your car. In many cases you have to replace the whole carburetor or some of its parts.
Clogged brushcutter exhaust
Since there is oil in the gasoline, it burns and gives off a lot of carbon monoxide which is deposited in the muffler and the exhaust window. On some trimmers, a grid is installed. Flame arrestor, it also needs to be cleaned. The muffler either needs to be replaced, or the muffler needs to be burned out. My experience allows me to tell if the exhaust is clogged just by pulling on the starter. If you find soot in the window, peel it off, it must not get into the combustion chamber. Use a good oil with low smoke emission.
How to Adjust a Carburetor
Adjustment of the module is done by the factory. In the process of operating the unit, after repairing or cleaning the module, it becomes necessary to adjust the carburetor.
Carburetor adjustment does not require replacement parts. Adjustment is done with the 3 screws that are available in the design:
- L controls the fuel supply at low rpm;
- H controls fuel flow and temperature, and is also responsible for gasoline delivery at high rpm;
- T is responsible for engine idling.
Grass trimmer carburetor adjustment is done after the engine warms up. For this, 10 minutes of idling is enough. The rotation of the mowing head at idle speed allows you to proceed directly to the debugging of the screw T. Turn it counterclockwise until it stops turning. Then turn the screw H to the right and left to find the position in which the idling speed is at its maximum. T Turn the screw ¼ of a full turn anticlockwise from the point found, this will be the working position.
Screw L is adjusted according to a similar procedure. After repairing the carburetor module is sure to adjust the device to work properly.
Why does not the grass trimmer gasoline start?? Causes and their elimination
Recently, the gasoline grass trimmer has gained the status of one of the main tools in the arsenal of dacha owners. And this is not surprising, because the motorized grass mower allows you to quickly bring the garden plot in order. However, sometimes it happens that the grass trimmer does not start when hot and even when cold. In such situations, it is necessary to independently determine the cause of the malfunction. Let’s find out what to do if the grass trimmer won’t start. The causes that most often lead to such troubles will be discussed below.
How to Repair Your 18v Ryobi String Trimmer
Photo of the lawn mower repair process
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Lawn mower won’t start or starts but stops. What’s the reason?
To understand this, you need to know the principle of operation of the unit as a whole. It happens so, just bought, new saw does not start, and starts running around in service centers, in such cases it is recommended:
Carefully read the instruction manual; study in detail the way of the first start-up and running-in of the lawnmower; try to understand the principle of operation of the product, how gasoline is pumped and so on.
The fuel quality is poor; the proportions of oil and gasoline are incorrect; the fine filter is clogged; the spark is gone.
Lawn mower won’t start after the winter
In such cases it is necessary to service the engine. Take off the fuel system including filters (air, fuel filter), take apart the carburettor, clean and flush every part. Blow out the filters with air. Pay attention to the quality and octane rating of the fuel.
It is necessary to take into account that products of such famous brands as STIHL, Husgvarna and others, will not run on cheap gasoline with a low octane rating. For them, suitable fuel from AI. 92 and above from gas stations, and then with a well-established, because gas stations can also be bad gasoline. The use of high octane and quality gasoline will determine how long you will use the mower and how long it will last.
Another thing you should remember is that if you store the diluted fuel mixture for a long time, it has a quality problem, which also leads to the consequences when the lawnmower won’t start. The spark is there and the mixture is still hot enough to start the lawnmower. The proportions of petrol and oil are clearly described and explained in the instruction manual. Strict adherence to the correct proportions will at least save you from several questions, why the lawnmower does not start and what to do in such cases.
lawnmower starts and stops. What to do?
A spark is there, and everything seems to be in the norm, but the lawnmower does not start, in such cases, you should check the valve air access to the fuel tank. A clogged valve creates a vacuum in the tank that causes the carburetor to receive less gasoline, so the lawnmower will start but then stalls. In order to rule out this cause it is necessary to clean the valve and try to start the lawnmower with the tank cap not completely screwed on. 2. If the lawnmower does not start, remove and clean the fuel filter and check all the carburetor parts, then try to start it. The lawn mower won’t start again, the air filter is disconnected, try to start without it, if the lawn mower starts, the problem is in the air filter, replace it.
The lawn mower won’t start, the spark is gone
Lack of spark involves checking the contacts and the correctness of the gap between them, the wire to the plug and the plug itself. The way to check the spark. unscrew the spark plug, connect a wire to it, put the spark plug sideways to the hood of the engine and pull the starter several times as if starting the lawnmower, while looking at the carbon and the spark plug contact, between them should run a spark. If there is no spark, take a new spark plug and do the same procedure, if you still can not find the spark, then the problem is in the wire or terminals, it is better to replace them.
lawnmower doesn’t start when cold
It is not advised to press the gas when starting a cold engine. Tilt the lawnmower so that the air filter is on top, press the suction button 5-6 times, set the function switch lever to the “start” position, pull the starter cord several times until the engine starts. After a few seconds of the engine, turn off the start system.
the lawn mower does not start when hot
If the lawnmower has recently been in operation and has not yet had time to cool down, but does not want to start. press the throttle trigger, pull sharply the starter cord several times until the engine starts and only then release the throttle trigger. If enough time has passed and the lawnmower has had time to cool down, then you need to start as when cold. If the above methods did not help, lawn mower does not start, then it is worth to apply to the service center.
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Lawn mower malfunctions and ways to fix them
Any type of lawnmower has a hollow shaft with a connecting cable between the engine shaft and the lower gear that transmits the rotation to the working body with the cutting tool. The carburetor and motor are located in the upper part, while the gearbox and the cutting tool are located in the lower part, covered by the hood. In the middle part there is a transverse handle, in which the control buttons are located. To relieve the hands, there is an unloading belt that holds the boom with the operator’s torso.
Top Reasons String Trimmer Not Starting — String Trimmer Troubleshooting
When choosing a lawn mower, a machine with a two-stroke engine is preferable to a four-stroke. The two-stroke engine is more maneuverable and easier to repair. With a four-stroke unit, the vibration level is lower.
It follows that the lawnmower repair consists of troubleshooting;
- the engine does not start;
- the cutting mechanism does not pick up speed;
- Engine stalls;
- the gearbox is heating;
- You hear a strange knock, a strong vibration of the boom.
Before fixing the problem, you need to make a diagnosis, to determine the malfunctioning unit.
Important to know tool lubrication points. Continuous care, cleaning of the machine after operation will prolong its life. Before you work, you need to tighten the mounting bolts, prepare fuel and fill the tank.
How to Fix a Trimmer That Won’t Start!
Main. fuel mixture!
In this case the remains of dissolved in an aggressive environment plastic do such awful things in the combustion chamber that you can’t do without a complete overhaul of the mechanism. But you will always remember how to store fuel correctly.
What to do when the fuel was exactly normal, the spark is there, but the gasoline grass trimmer does not start? It is possible that you just filled the spark plug with gasoline. In this case you need to unscrew it, wipe it with a clean rag and dry it. By the way, it would be nice to check the spark plug itself for serviceability.