lawn trimmer does not start on hot. Grass trimmer working peculiarities

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Diagnosing the reasons why the lawn mower won’t start. Quick comeback of Chinese and domestic brushcutters with a two-stroke internal combustion motor. It happens that the two-stroke motor does not even show a flash in the cylinder, and sometimes. it catches, and then immediately snaps. Do not be sad, this Chinese consumer goods can be repaired right on the knee with a minimum of tools.

Before you start the diagnosis, you need to make sure that the engine rotates with little resistance. If there is no compression, it means that further work is useless, and it is necessary to change the piston (there is nothing complicated about it, everything is as a construction set).

First is the spark plug

The first thing to do is unscrew the spark plug. If it is wet, then the ignition system is faulty. Try wiping the spark plug, stick it in the cap, put it on the engine, pull the starter. The spark is there? If it is not, it means that it is necessary to change the spark plug.

Replacing the spark plug did not help? Then you need to look at the magneto, cable, ignition coil. The cable is tested, the coil is checked for resistance (multimeter to the resistance measurement mode at 200 ohms, one contact to the earth, the other. to the output of the coil, it should show from 0.4 to 2 ohms).

Sometimes the magnets on the flywheel get dirty, or the key gets slicked and the ignition timing flies off. The Chinese crap throws up different surprises, but for the most part all can be detected visually.

It is definitely necessary to pay attention to the fouling of the spark plug. If it is black and the plug is smoky, it means that the mixture is rich, or you have not mixed the fuel correctly. If the fouling is white, that means the mixture is lean and the engine might be already dead from the temperature. Ideally, the color should be brick-colored, light, without much fouling.

Again, if the plug is black and dead, do not immediately blame the carburetor and ignition. Screw in a new one, look at the plaque. Maybe it’s just a bad spark plug.

Step by step diagnosis and check your chainsaw

Exactly, these nodes are the main sources of the problem of a difficult start of the grass trimmer. A more complex problem is the carburetor, which needs adjustment. Let’s look at each component individually to find out the reasons why the grass trimmer does not start, and fix them with your own hands.

Checking the presence and quality of fuel

Do not understand why the lawnmower does not start, then, immediately make sure that there is fuel in the tank. Often beginners forget about the fact that it is necessary to pause periodically to fill the tool with gasoline and oil mixture. If the lawnmower tank is empty, then of course it will not start, no matter how much you try to do this.

If there is fuel in the tank but you can’t get the tool’s engine running, take your time to disassemble the carburettor. Make sure that the start of the grass trimmer engine is done correctly, as indicated in the manual. If starting is done according to the instructions, then it is important to consider the following points:

  • Do not use high quality gasoline that has the highest octane rating but use the brand recommended by the manufacturer. And not always such a brand is gasoline AI-95. If you do not know what gasoline to use for the lawnmower, then choose AI-92
  • Oil must be special. for two-stroke engines. If the lawnmower has a four-stroke motor, it should be filled with pure gasoline without stirring with oil. You should not skimp on the quality of oil for the grass trimmer engine, just as you should not skimp on gasoline. After all, the quality of the fuel used determines the operational life of the motor
  • Mixing the fuel in the right way. Observations show that most mowers only control the process of making oil with gasoline for the grass trimmer for the first time. The more experience the mower has, the less attention is paid to the process of mixing gasoline with oil for a two-stroke engine. The ratio of gasoline to oil should be as recommended by the manufacturer. Typically, this ratio is 25 to 1, that is, 1 liter of gasoline needs 40 ml of two-stroke oil (engine oil for cars and the more waste can not be used)
  • Proper storage of fuel mixture. it is often the case that after a fuel mixture has been prepared it stands for a longer period of time than 2 weeks. Do not keep the ready mix of petrol and oil for a long time, since it causes the oil to precipitate, and thus the properties of both oil products are lost. even after a long period of storage, stirring the mix is not an excuse for continuing to use it. This is why it is not recommended to prepare more than 2 liters of mixture at a time

Check that all the above items have been implemented, and only then proceed to check the condition of the spark plug. the grass trimmer does not start for a variety of reasons, and most of them can be identified independently. It is not practical to disassemble the carburetor if you cannot start the engine. The next step on the way to troubleshooting is to check the condition of the spark plug.

Why won’t the mower start?

You can find out the cause of the malfunction by disassembling the device. This must be done carefully and cautiously, there are many small parts inside that are easy to break. There are 2 types of damage: mechanical, electrical. Consider the most popular Reasons why the mower won’t start or hold up:

  • Failed carburetor;
  • Bolt connections loose;
  • Engine failure;
  • Jammed moving mechanism components (crankshaft, piston);
  • Blockage of the cutting tool (cylinder) by a foreign object. branches, sticks, hard grass, stones, etc.Д.;
  • Oil and fuel supply system is broken;
  • The spark plug does not work;
  • Tensioned, torn belt;
  • Small or too much clearance between the parts inside the structure;
  • Faulty unit switch;
  • Dirty fuel hose, vents;
  • Clogged air filter.

When used for extended periods of time, gasoline lawn mowers do not interfere. kiosk device. Why the mower does not stand and does not start hot? Overvoltage motor. It is better to postpone mowing, let the mower stand, after it has stopped, most likely the cause is overheating the unit.

The most common faults of lawnmowers

As for problems with engine failure or jamming, they are almost uncommon in cart-type lawnmowers, which we review in the article. These faults are more common in manual petrol lawnmowers and account for almost half of the reasons why lawnmower users call the service center.

The numbers mean the following: one part oil takes fifty parts gasoline. From here: 1000 ml (1 liter of gasoline) divided by 50, we get 20 ml, that is 1:50.

This is how you calculate the fuel mix (petrol/oil) in various proportions. To add oil to gasoline without “by eye”, you can take a 20 ml syringe of medicine, fill it with oil and “inject” it into a container for fuel mixture preparation.

Small amounts of oil mixed with gasoline will cause increased wear on the cylinder piston group. Although the excess oil in the mixture is not so fatal, but it is also harmful. Piston rings may get corked, there may be rapid formation of soot in the combustion chamber, and the engine output may drop. The muffler mesh screen can also get corked. Therefore, some users (after the end of the warranty period on the grass trimmer) recommend to dismantle it.

The gasoline used in the brushcutter is AI 92. You have to read the exact gasoline brand in the instruction manual. You should not try to “force” the engine by pouring into it the 95th gasoline. This can lead to overheating, unstable operation of the grass trimmer, and breakdowns.

It is not recommended to leave fuel in the trimmer‘s tank during a long break in work. It is better to finish a working day with a full mixture. If you don’t do that, then, since overnight the gasoline from the engine will evaporate, and a thin film of oil will remain, the carburetor jets may get clogged. This will cause difficulties the next time you start the engine.

It is also necessary to observe safety rules when storing fuel. Many people pour petrol into a plastic water bottle. Is it worth it??

lawn, trimmer, does, start

Never put gasoline in a plastic water container. When mixing the fuel mixture, a static charge builds up and you can “catch” a spark.

That’s why gas stations do not allow you to put gasoline in plastic cans. only in metal cans. Before filling the metal canister with gasoline it is better to put it on the ground to get rid of static electricity.

But there are situations when simple trimmer manipulation does not help. The engine still will not start. In this case, check the power and ignition systems, following the rule “the engine does not work if there is nothing to burn or nothing to ignite”.

How to avoid most problems?

The performance of this seasonal equipment is greatly affected by its proper storage. This is true not only for long “rest periods” in winter but also for short periods of inactivity. To save yourself and your machine from trouble, you need to follow a few simple guidelines.

  • Before leaving for a well-deserved rest, the grass trimmer tank is emptied of residual fuel. To remove all the mixture, the lawnmower is started and run until the engine stops.
  • The first operation after “winter hibernation” is to pour a small amount of oil into the spark plug hole. Before this, the piston is moved to its extreme position. This lubrication will make starting easier and prevent premature wear and tear.

Before you start working with the brushcutter, be sure to check the spark plug and all the main nodes of the equipment.

There are quite a few reasons why the grass trimmer does not start. But most of them can be found and fixed by yourself. The main thing. the correct diagnostics, attention and sequence of actions. And about how you can cope with the problems, in detail will tell the master of the following

Diagnose and repair electric motor problems

Faults of electric trimmers may be as follows:

You don’t have to disassemble the whole machine to fix these problems.

For the record! Before you start the repair, it is important to prepare the necessary tools: a set of screwdrivers, a tester, a soldering iron, an indicator, a set of keys.

Severe motor problems will require the motor to be disassembled. To do this you need to unscrew a few screws. After gaining access to the parts of the motor, it is necessary to carry out the following actions:

  • Check the degree of wear of the brushes. unusable parts will need to be replaced with new ones;
  • Test the motor winding. the resistance should be high;
  • check the stator and rotor. to test the rotor winding with a multimeter, measure the resistance: large deviations from the norm indicate a malfunction, the lack of resistance on the stator winding also indicates a breakdown (in the same way diagnose the stator housing).

Advice from! Solving problems related to faulty electrical components is very difficult. It is often easier to replace them with new parts than to take the time to rewind.

Problems with low revolutions are common for cheap trimmers. However, if improperly serviced, this also affects manual mowers such as Huter, Patriot 3055, Echo.

When to call a workshop

If the machine is under warranty, at the first signs of incorrect operation, you can safely take it to a specialized workshop. Repair will be done for free, regardless of the nature of the damage, if it was not the fault of the owner. In case of an engine breakdown, it is better for a person who is not technically proficient to immediately contact a specialist. In any case, the degree of seriousness of problems with the unit is determined by the user himself.

To summarize. Both gasoline and electric grass trimmers are designed for many years of reliable operation. Most of the problems described above occur because of the lack of attention of the owner to his assistant. Subject to strict compliance with the requirements of the manufacturer and regular maintenance, the hand-held mower will work rhythmically and without interruptions.

What is the service life of a Chinese brushcutter??

Chinese or Russian lawn mower is able to work about 500 hours. But that’s with the right mixture, good oil and not bad factory assembly. If you put gasoline from a good gas station, measure the same amount of oil accurately, adjust the carburetor to the same mix and the fuel burns properly, the coveted half a thousand hours of moto life is a reachable goal.

But here we must not forget about the Chinese defect. They even balance shafts on a crank, put the cheapest bearings, carburetors are stamped with clogged ducts. If a person understands the principle of the two-stroke motor and carburetor, understands how to rebuild it, he can eventually assemble an almost perfect trimmer for grass.

In general, if we consider a Chinese brushcutter as a space for creativity, then even its failure is an occasion to learn something new, it is a construction set for a man.

If you really need a tool, then it is worth looking for a Japanese analogue, or to switch to an electric model.

Rules of lawn mower operation and storage

To ensure that the lawnmower starts well in the future, it is necessary to provide it with good storage and operating conditions:

  • During operation, carefully monitor the cooling system, carefully and timely clean the channels in the body, as well as the starter ribs;
  • If necessary, use solvents, kerosene and other cleaning agents for cleaning;
  • do not clean the tool when it is hot. let it cool down;
  • strictly follow the requirements of the instructions about the mode of operation, otherwise you can overheat the engine;
  • if you do not plan to use the mower in the next month, the fuel mix should be drained from the mower. к. Over time, it disintegrates into heavy fractions that will definitely clog the carburetor passages;
  • After draining the fuel let the trimmer work at idle until it stops, this will help completely remove the remains of the working mixture.

Before winter storage, do the following steps.

Grass trimmer, both electric and with internal combustion engine (ICE), is an indispensable tool in the summer and fall for owners of summer houses and private homes. With its help it is easy to remove weeds, small bushes and trim the lawn. But like all machinery, grass trimmers fail at the most inopportune moment. To eliminate malfunctions with their own hands, the user of this equipment must first determine the cause of their occurrence.

Lawn mowers and electric grass trimmers, if we do not consider breakdowns related to the boom and mowing head, malfunctions mainly occur in the area of the engine.

Breakdowns gasoline trimmers

Typical breakdowns of the gasoline grass trimmer, which the owners of this unit are most often faced with, are the following:

  • engine breakdown;
  • problems with the carburetor;
  • problems with fuel supply;
  • muffler failure;
  • gearbox breakage;
  • broken starter;
  • problems with the air filter;
  • the breather valve on the gas tank is clogged.

Faults of electric trimmers

As the structure of an electric mower is much simpler than a power trimmer, the reasons for its failure are few.

It should be noted that it is better to entrust the elimination of some of them to a specialist.

Basically, the grass trimmer stops working normally in the following cases:

lawn, trimmer, does, start
  • electric cable failure;
  • The control button is faulty;
  • burned out winding of the motor stator;
  • breakage of contact connections on the motor.

Grass trimmer does not start due to a faulty carburetor

One of the most difficult reasons for the inability to start the lawnmower, is the carburetor. This mechanism is responsible for the preparation and correct flow of the fuel-air mixture into the cylinder. If the carburetor is clogged or not properly adjusted, the lawnmower may not start or run erratically.

How to adjust the carburetor on the lawnmower tell journalists ProfiDom.com.ua

If the adjustment does not help to restore stable operation of the engine of the tool, or the grass trimmer does not start at all, then you should remove the carburetor, and make its repair. The whole repair of the carburetor is that you need to disassemble it, clean all the channels and constituent elements. If necessary? replace defective parts^diaphragms, filters, etc.■ repair the carburettor.п.

The following types of malfunctions can occur:

  • Channels and nozzles are clogged. special fluids can be used for cleaning, but it is best to disassemble the mechanism with a thorough washing. The reason of clogging of channels and jets of carburetor is storing the tool with fuel in the tank
  • Wear of carburetor gaskets. rubber seals contribute to the fact that the tightness of the mechanism is compromised, resulting in malfunctioning
  • Malfunction of carburetor membranes. they are responsible for pumping fuel into the device

To be sure of the malfunction of the cylinder, you should perform a compression check, which is described above.

How to store your lawn trimmer correctly and avoid problems starting it

On the correct approach to the storage of the grass trimmer depends on its startup. And, it is not only concerned with winter long storage. When storing chain saws and trimmers, you need to consider a number of the following rules

  • Before putting the tool away for winter storage, drain the fuel from the tank. In addition, fuel residues must also be removed, and this can be done by starting the engine, giving it to work for a while until it stalls
  • It is desirable to store the tool in a dry room
  • Before starting the engine after a long pause of more than 2-3 months, you must first inspect the electrodes of the plug, as well as check the main nodes. air filter, high-voltage wire and so on
  • When using the tool, it is necessary to take into account that overheating of the motor negatively affects the service life, so you need to take breaks when working, especially if the grass trimmer with a two-stroke engine is used for work. 4-stroke machines are not only more powerful, they are also more robust
  • After the winter, the first thing to do is to pour some oil into the spark plug hole, having previously moved the piston to the extreme dead center. This is necessary in order to lubricate the parts of the cylinder and gear when starting the engine, thereby excluding their rapid wear
lawn, trimmer, does, start

Only, with the right approach to finding the reasons why the grass trimmer does not start, you can find and fix the breakdown on your own. You don’t have to be an expert to do this and understand the construction of gasoline driven machines. Proceed in sequence, which is presented in the material, and the recovery of the lawnmower will be easier than ever.