Lawn mower engine does not rev up. The lawn mower does not develop full power. Why doesn’t the STIHL electric brushcutters kick in?
There are a number of different causes for this common problem. During the work with the device you can meet both obvious malfunctions, the signs of which are clearly visible, and with asymptomatic cases. The first option is the easiest to find the problem. If the grass trimmer does not pick up speed and there are no clear signs of failure, you will need to consistently check the most common cases of malfunction, and if you find the cause. fix it.
The problem with lawn mowers that don’t pick up speed is mainly found with petrolengine driven machines. Different models of carbs suffer from this problem, like Husqvarna, Champion, STIHL.
With quality products such problems are less common than with cheap products from unknown manufacturers.
Use of poor quality fuel
The grass trimmer does not rev up if it is filled with low-quality fuel. The engine may stop starting or run “jerkily” for that reason No engine starts or spurts ” by changing the rotation speed of the blade or line.
To determine the quality of the gasoline used, you can do the following.
- Use a special key to remove the plugs.
- Visually inspect their working contacts for the presence of a red brick layer: if it is present, the fuel used contains significant inclusions of additives.
Candles in general often act as indicators to identify problems with the combustion chamber of a gasoline engine, because they can be quickly removed and inspected.
If a build-up is detected, the fuel in the tank must be drained and replaced with high quality fuel. The lawnmower in use should be filled only with the brands of gasoline specified by the manufacturers in the instruction manual. Also it is necessary to Clean the spark plugs from deposits before installing it in place.
The air filter or fuel filter is soiled
The next most common cause of the trimmer’s low RPM is a dirty air or fuel filter. In the first case, the problem is that the fuel-air mixture entering the combustion chamber not oxygenated enough. The fuel does not burn all of it. This prevents the brushcutter from producing its full power.
To check if the air filter is really the culprit, take it off (with the lid unscrewed beforehand) and turn the lawnmower on. If it operates normally, the clogged filter element should be replaced with a new one.
If the situation has not changed after the performed actions, you need to pay attention to the fuel filter. The essence of the problem is similar to the previous case, only instead of a lack of oxygen Not enough gasoline is coming in for proper operation of the device. This problem is also eliminated by simply replacing the filter element. Air and fuel filters are inexpensive. It is not difficult to change them yourself, and all the work does not take much time.
It should be borne in mind that without a fuel filter, it is forbidden to operate the grass trimmer by the manual, otherwise you will need to repair the piston unit after a short time.
Problems with spark plugs
With constant use of the lawnmower, the spark plugs get dirty and wear out over time. To check it, they are removed and inspected for fouling. The malfunction can be corrected in two ways: if possible, repair the old spark plug, or simply install a new one in its place.
- unscrew and wipe off the fuel from the spark plug;
- dry it out without burning it;
- using a scraper or fine sandpaper, remove the soot from the plug and check the gap between the electrodes (should be 1 mm)
- Assemble the grass trimmer;
- Start the lawnmower.
If the spark plug does not give out a spark after reconditioning manipulations at the right electrode distance, it will be necessary to check check the quality of the connections elements of the electrical circuit of the device. When the wires are all right, you will definitely need to install a new part.
Replacement of plugs is an uncomplicated process that is cheap, and if you can restore the old ones, it is even free. All you need for the job is a spark plug wrench and a nail file.
If there is regular rapid contamination and deterioration of the plugs, then you need to look deeper into the problem of these abnormal phenomena.
Troubles with the engine
If the fuel, filters and spark plug are all right, then the next problem might be with the gasoline engine. It can have the following mechanical failures:
In the carburetor department is a small cable. It can malfunction and lead to the problem in question. Therefore, when dealing with a carburetor, you should first check the condition of the cable. and tighten if necessary (but not to the limit). The main thing is not to overdo with the tension, so that under load it does not crack.
After that, you have to check carburetor operating settings. which must comply with the parameters given in the manual. If they are set correctly, and the desired effect is not there, then you should disassemble the part, wash, clean, purge with a pump all of its progress and assemble back. The carburetor itself should be without mechanical damage.
If it is impossible to restore the performance of the carburetor itself, it is better to replace it with a new part or resort to the services of professionals.
If the adjustment or replacement of the carburetor does not give the desired result, it is necessary to clean the driving mechanism and lubricate the cable inside it with oil.
Grass trimmer operation features
All grass trimmers are classified by type of power supply: gasoline or electricity (mains or battery). It should be noted that gasoline mowers are superior to their electric and battery-powered counterparts in many ways. Despite the fact that they all perform similar functions, the difference in performance, maneuverability and efficiency is very noticeable. However, the general principle of operation of all types of manual mowers is almost the same. the devices are equipped with engines (two- or four-stroke engines or electric motors), which drive the cutting unit (spool with a fishing line or a metal disc). All elements are mounted on a straight or curved boom, including the handle to control the trimmer, which has the main buttons.
Since the problem of weak revolutions is more typical for petrol versions of trimmers, they will be given more attention. The lawnmower is simple to operate and easy to maintain. But most of the faults are caused by the user’s ignorance of the following simple things, listed in the manual. Therefore, before operating the machine, it is necessary to carefully study the manufacturer’s manual. In particular, in order to start the engine, it is necessary to carry out the following consecutive actions:
- turn on the ignition button;
- Press the silicon button several times to pump the gasoline;
- close the air flap;
- set the throttle lever in the high rpm position;
- first make slight jerks with the starter handle to feel the resistance of the engine, then sharply yank.
If the lawnmower starts, but stalls, you need to put the air damper in the middle position and try again. When the engine starts to work, you need to turn off the gas and open the air damper, as the trimmer for grass works only on the suction.
Important! How the grass trimmer operates depends on various environmental influences. You need to give the machine more time to cool down in hot weather. The engine also overheats too much when working in dense or overgrown vegetation. Take a five minute break every 15 to 20 minutes.
Troubleshooting and Causes of Troubleshooting
In order to best determine the cause of any brand grass trimmer malfunction (e.g., Echo) and determine if it can be repaired, you need to determine what action the unit is stalling on. The engine can shut down at idle, at high RPM, when heated under load, or immediately after starting, etc.д.
If the mower stalls after the gas is turned on
Gasoline lawnmower owners often report that their lawnmower cuts out when they step on the gas. Usually such a breakdown occurs due to problems in the carburetor. Failure in his work can occur due to prolonged storage, use in difficult conditions, significant overloading of the motor. The symptom of such breakdown will be vibrating movements of the device when working.
As a side note! Users familiar with automotive carburetor repair can try to repair this important grass trimmer assembly on their own, using the instruction manual. If this is not the case, the best solution is to ask for help from the service center.
Sometimes the grass trimmer stops when you give the gas, because the fuel valve is clogged. It interferes with the flow of gasoline. To fix the problem, it is enough to loosen the valves. This will restore normal fuel supply to the carburetor.
At high revolutions
When the grasshopper stalls at high rpm, it is due to the following faults:
- The gas grass trimmer is more often used in villages or in the countryside, or by a clogged or jammed valve on the gas tank lid;
- The carburetor is razregulated under the influence of vibrations arising from the operation of the mechanism;
- problems with fuel mixture circulation;
- Atmospheric air intake;
- the hose intended for fuel intake is cracked or poorly connected.
, Referring to the operating instructions for the trimmer. It is often sufficient to loosen the tightening of its housing for adjustment. If there are problems with the circulation of the fuel mixture, it can slowly flow into the carburetor. After it has run out, the engine will shut down at high revs.
What is the mowing head for your petrol-powered lawnmower?
Two types of cutting attachments or cutters are used in the construction of chain saws. These are spools of fishing line, as well as steel or plastic discs. What’s the best choice for a power tool. This site provides information on how to choose disks and lines for trimmers, as well as their types and design features. Let’s briefly consider what types of cutting blades should be used on trimmers and gasoline cutters.
For mowing soft grass, a line for the trimmer is used, which is wound on a drum or spool. unlike metal discs, the line for trimmer is used where grass grows near trees, houses, fences and other obstacles. line for trimmer allows you to make a quality mowing of grass near obstacles, while not violating the design of the tool
The choice of cutter bar depends on where the tool is used. If it is planned to work in the homestead area, then the line for the trimmer is selected, and for mowing grass in the field or steppe, discs with 3-4 blades and more are used, as well as discs with fine teeth.
It’s interesting! In most cases the cutters do not come with tools, so the buyer can decide for himself what he needs. a line for the trimmer or a steel disc.
Problems with starting the engine
Correctly determine the cause of the failure is very important, because otherwise we just can’t fix it. If there are no extraneous noises when trying to tune the chainsaw (knocking down, sanding, etc. Д.), Often it turns out that there really is no problem. For example, if you don’t start the chainsaw correctly and pull the fork for a long time, the engine just pours and starts very hard.
To properly start the chainsaw engine, set the lever or switch to the “flap” position. Then you need to pump the mixture into the carburetor, if a fuel pump is available. Pull out the starter handle until the resistance of the engine is noticeable, and vigorously pull the amplitude by taking your hand to the side. After two. three such motions, the engine should first start and then decay. If not, you need to set the lever to the half throttle position or just the work position and then continue to operate the chain saw in that mode. Many chainsaws “half throttle” lock automatically when the air damper is pulled. Some models have an ignition key, it is important to make sure that it is turned on.
If the engine does not start, the first thing to do is. unscrew and check the spark plug. There are cases when the plant fills the burner with fuel in the cold season. Then, too, unscrew the spark plug, dry the combustion chamber with one plant, clean the spark plug, screw it in and restart. It is advisable to immediately check the spark. On a twisted spark plug, we put a cap on the high voltage wire, we put it on the cylinder, and we pull the starter. Visually observe the frequent blue spark. OK. We twist the spark plug into place and start it. If there is no spark, change the spark plug and try again. Again, no. Check the high-voltage wire connection to the spark plug, coil and ignition system.
In general, the condition of the spark plug can be used to determine the type of failure.
- Dry. Most likely, the fuel mixture is not entering the cylinder. This is not the ignition system, so the spark plug is screwed on and checked.
- Wet, heavily spattered with fuel. The cause of excessive fuel mixture is due to improper starting, as described above, or to improper carburetor adjustment.
- Covered with black carbon. This may indicate the use of low-quality oil, an improperly set carburetor, or an improperly calculated gasoline to oil ratio. The spark plug should be washed, cleaned of carbon deposits with a sharp object (an awl or a needle), wiped with a cloth and re-installed.
When checking the spark plug, pay attention to the gap between the electrodes: the normal is considered to be 0.5 to 0.65 mm. Damaged or worn gasket must be replaced.
A properly adjusted carburetor chainsaw ensures that it performs at full power with the most economical fuel consumption.
The need for carburetor chainsaw adjustment is infrequent, since the adjustment is initially made by the manufacturer to achieve optimum operation. Adjustment screws are for more fine-tuning the carburetor chainsaw, if necessary.
Among the most common reasons for malfunctioning adjustment screws are the following:
- Strong vibration or damage to the protective cap. It happens rarely, but it does happen.
- Severe engine (piston) wear. Of course, in this case, it is better to take care of the repair of the chainsaw, but the adjustment of the carburetor can improve its functionality for some time.
- Dirt in carburetor due to poor quality gasoline or scale build-up. In this case, in addition to adjusting the carburetor, it can be avoided.
The lawnmower stalls at high revolutions on gas
Perhaps the most common complaint associated with gasoline trimmers is “the lawnmower stops”.
Naturally, the precondition for this may be quite a severe malfunction. The lawnmower does not revolve.more why the Chinese lawnmower does not pick up. lawn mower does not revolve, why the Chinese mower does not revolve. But in most cases, the situation is even simpler than it seems at first sight.
To cope with such a malfunction, first try, without the help of others to deal with its causes, because, having found the cause, with a malfunction to beat even easier, and sometimes it even samolikuditsya.
In fact, the circumstances, this is when the lawnmower cuts off at high revolutions. there are quite a few of these circumstances.
Another is the presence of defects in the power system.
If that’s the case, the lawnmower will stall at idle speed. No tangible results did not give. Why the Chinese mower does not develop speed. Why does my lawnmower not rev. Why lawn mower revolutions. I can not get it off the ground.And revolutions gain from the floor. Dilemmas with the power system can be caused by improper carburetor adjustment or misalignment.
According to current statistics, gasoline mower models are in greatest demand. This is largely due to their mobility and functionality. However, when choosing a particular sample of equipment, it is necessary to take into account a number of other parameters. In such situations, it is not unreasonable to compare brushcutters with other types of trimmers.
Electric devices are connected to 220 V household electrical system. Such machines do not pollute the air due to the absence of exhaust gases. No less important moments will be the minimum noise level and relatively low weight. At the same time, the area to be mowed is significantly limited by the length of the cable used.
Cordless models currently represent the least common grass trimmers for grass. The electric motor of such mowers is not powered from the network, but from the battery, which provides maximum mobility. However, the operating time of the technique is limited by the battery charge and averages 35-45 minutes. Another important point is the relatively high cost of cordless models.
Choosing a specific model of gasoline trimmer for grass, it is necessary to take into account its technical characteristics. Thus, low-power devices are equipped with spools of fishing line
On the faster and more powerful models, knives and cutters can be used as cutting elements.