Lawn mower won’t pick up speed and shuts down

Malfunctions of the gasoline lawnmower: the most frequent problems and their elimination

Grass trimmer that has a gasoline drive is a useful thing for owners of homesteads, lawns, and when the grass trimmer suddenly stops, the work of clearing the area of grass stops. The device itself is a fairly complex mechanism, so there are many different causes of its failure. The most common malfunctions are contained in the instruction manual. Knowing the reasons why the grass trimmer stalls should be a good way to effectively repair the device yourself.

Malfunctions with a chain saw associated with the fact that this device does not start are classified in a certain way by service technicians. They stand out faults with the following nodes of the mechanism:

  • The engine, in which the piston and bearings can wear out or fail, the crankcase can crack;
  • The fuel supply system, with possible filter clogging or carburetor problems;
  • mechanical damage to the wires, tubes, hoses;
  • The ignition circuit.

In order to correctly identify the node where the failure occurred, you need to pay attention to the circumstances under which the grass trimmer stalls.

Checking the fuel mixture

Let’s say your grass trimmer won’t start. In this case, the first thing to check whether there is enough fuel in the tank, as well as to assess the quality of the fuel mixture. Only high quality gasoline should be used when filling up the engine. It is recommended to use fuel, which brand is not lower than AI-95. Filling the trimmer for grass with fuel of unknown origin, bought not at the gas station, is fraught with the occurrence of frequent malfunctions of the tool. This can cause failure of the cylinder and piston system. Repair in such a case often exceeds the cost of the device itself.

Why the grass trimmer gasoline does not start? Incorrect preparation of the fuel mixture, consisting of oil and gasoline, can also lead to this. The proportions in which these components are combined, are specified by the manufacturers in the manual for the grass trimmer. Preparing the fuel mixture is highly discouraged in large volumes, that is, for the future. If it is stored for a long time, the defining properties of the substance are lost. Therefore, if the grass trimmer does not start, it is worth draining the old fuel and using a freshly prepared fuel mixture.

Lawn mower stalls when you press the gas, how to fix the breakdown

There can be a huge number of reasons why your lawn mower stops, we offer the most common ones, and hope that you will find yours, and, of course, fix it. So, one of the situations is clogging the air damper, the hole behind which the fuel is atomized. If something has gotten into it, it can usually be removed quickly and easily. This is the easiest cause, as is a clogged filter. It should be washed in solvent and then blown out with compressed air. If it cannot be repaired, then order a new one from the KosiKosa parts store.

When a grass mower stalls at high revs, it is due to the following malfunctions:

  • The valve on the gas tank lid is clogged or stuck;
  • The carburetor has become unadjusted under the influence of vibrations that occur during the operation of the mechanism;
  • Problems with the circulation of the fuel mixture;
  • atmospheric air inflow;
  • the hose intended for fuel intake is cracked or poorly connected.

Adjust the carburetor by referring to the trimmer’s operating manual. To adjust it, it is often sufficient to loosen the tightening of its housing. If there are problems with fuel mixture circulation, the mixture may slowly flow into the carburetor. After its development the engine stops at high revolutions.

Causes of malfunction and remedy

To most accurately determine the cause of malfunction of any brand grass trimmer (e.g., Echo) and find out the possibility of fixing it, you need to establish, when performing what action the device stalls. The engine can turn off both at idle and at high RPM, when heated under load or immediately after starting, etc.д.

lawn, mower, speed, shuts, down

If it stalls after the gas is applied

Gasoline lawnmower owners often complain that lawnmower mowing stops when the gas is depressed. Usually such breakage is caused by carburetor malfunction. Failure in its operation may occur due to prolonged storage, use in harsh conditions, significant overloading of the motor. The symptom of such a breakdown will be vibrating movements of the device during operation.

As a side note! Users familiar with car carburetor repair can try to repair this important grass trimmer assembly on their own, using the instruction manual. Otherwise, the right solution is to ask for help from a service center.

Sometimes the grass trimmer stops when you give gas, because the fuel valve is clogged. It prevents the flow of gasoline. To eliminate the problem, it is sufficient to loosen the valves. Thus, the normal supply of fuel to the carburetor will be restored.

Restoration of electrical equipment operability

Mowers with electric motors inside most often start getting cranky because of oxidized contacts. terminals are covered with a layer of scale from excessive moisture in the room or in another storage location. It is also worth checking for broken wires in problem areas. Use a multimeter or other type of tester for this operation.

When a set of gardening equipment contains a brush motor, then we identify the serviceability of the moving unit. Brushes can wear down quickly, causing a loss of contact. Repair kit with them costs relatively little, and it is easy to find it in specialized stores where they sell spare parts for such equipment.

Asynchronous motors also have problems. The phase-shifting capacitors in them fail. It is difficult to diagnose such a situation at home. It can be detected by circumstantial symptoms:

  • A humming sound can be heard;
  • When starting, the housing jerks slightly;
  • considerable heating of the motor occurs even at a light load;
  • RPMs are dropping.

It is worth to make a diagnostics of the state of the toggle switch and the voltage to the electric motor. When the testing of the described nodes, and violations in the performance is not detected, it is unlikely to fix the breakdown of the lawnmower with their own hands. Then you need to use the services of a company service.

Why won’t the lawnmower start?

You can determine what caused the mower to malfunction by disassembling the machine. It must be done carefully and carefully, there are many small parts inside that are easy to break. There are 2 types of damage: mechanical, electrical. Let’s consider the most popular reasons why the lawnmower does not start and stalls:

  • carburetor is out of order;
  • bolt connections are loose;
  • engine failure;
  • the moving components of the mechanism (crankshaft, piston) become jammed;
  • The cutting tool (cylinder) is blocked by a foreign object. branches, sticks, hard grass, rocks, etc.;
  • the oil and fuel system is broken;
  • the spark plug is out of order;
  • the belt is stretched or torn;
  • small or too much clearance between the parts inside the structure;
  • A faulty circuit breaker of the device;
  • Dirty fuel hose, ventilation grills;
  • clogged air filter.

If the petrol lawnmower is used for a long time without stopping. the machine shuts down. Why the lawn mower stops and does not start when hot? Motor overvoltage occurs. It is better to postpone mowing, let the lawnmower stand, after it has stalled, most likely the cause is overheating the device.

In some cases, this is a temporary phenomenon, after the engine has cooled down, the technique can work again. Still, you shouldn’t spend hours mowing. When used actively, the service life of the equipment is reduced. On average, repairs are required 4 years after the purchase of the product.

At idle speed

At idle speed, the following are common causes of grass trimmer stopping:

lawn, mower, speed, shuts, down
  • a reduction in gearbox rpm as it heats up due to the use of an unsuitable fuel mixture;
  • Throttle blockage;

If the problem area is the carburetor, the technique will stop on both “cold” and “hot” starts.

Immediately after starting

The machine may stall immediately after starting, if the carburetor is misadjusted or has been misadjusted. this causes Uneven fuel supply. The result is that the unit begins to vibrate distinctly. To correct the problem, the carburetor is readjusted according to the instructions for the mechanism.

Also the engine stops when there is clogging of the valve. fuel valve becomes clogged. In these cases, simply cleaning the carburettor is sufficient. If your lawn mower starts and then stops right away, you may have difficulty getting fuel to the carburettor. The problem can be solved by loosening the valve, which allows the mixture to circulate freely in the system.

Stalling can also be caused by air induction in the presence of mechanical damage to the hose (holes, cracks) producing the fuel intake. In this case, add revolutions to the actuator to expel air bubbles from the system faster.

immediately after starting the engine

The machine may stall immediately after starting if the carburetor is misadjusted or has been improperly tuned. this causes Uneven fuel supply. The result is that the device starts to vibrate distinctly. To correct the problem, the carburettor is readjusted according to the instructions for the mechanism.

Also the engine stops when the clogged valve. fuel injector. In these cases, simply cleaning the carburettor is sufficient. If the mower starts working but then stops immediately, the fuel may be getting to the carburetor unit with some difficulty. Solving the problem helps to loosen the valve, which allows the mixture to circulate freely in the system.

Stopping can also be caused by by sucking air there is mechanical damage (holes, cracks) on the hose conducting the fuel intake. In this case you need to increase the drive speed to expel the air bubbles from the system faster.

At high revolutions

The lawnmower often stops when heating up. It starts, runs “jerkily” and gradually stops. This process occurs when the gasoline in the carburetor boils either the flap is installed as a rotary rather than a disc type. In the latter case the part is replaced.

It happens that the grass trimmer gets warm if The wire of the ignition circuit is damaged or the coil. To get the device to work properly, you need to replace the parts.

At high revs

When the grasshopper stalls at high rpm, it is due to the following problems:

  • Blockage or jamming of the valve located on the fuel tank lid;
  • the carburetor has become misaligned due to vibrations from the machine
  • Problems with fuel mixture circulation;
  • Atmospheric air intake;
  • The hose intended for the fuel intake is cracked or poorly connected.

Adjust the carburetor, based on the operating instructions to the trimmer. To adjust the carburettor, it is often sufficient to loosen the screws on the body of the carburettor. If there are problems with the circulation of the fuel mixture, the fuel mixture may be flowing little by little into the carburetor. After it is worn out, the engine stalls at high RPM.

Malfunctions that lead to improper chainsaw operation

There are a number of faults that need to be taken into account when diagnosing, i.e. к. they can lead to malfunctions in the saw.

  • Worn crankshaft bearings. If the crankshaft bearings are worn, it is inevitable that runout will occur on the main shaft where the flywheel is attached. In this situation it is impossible to adjust the gap between the flywheel and the ignition coil, which leads to interruptions in spark formation and unstable operation of the chainsaw.
  • Contamination of the impulse line. The impulse line is the fuel pump’s control device and if it becomes contaminated the pump will not work correctly making the mower impossible to operate (it will start and then immediately shut down).
  • Wear on the cylinder head. As a rule, with increased wear of the cylinder head there is a decrease in compression in the chainsaw engine, which will certainly affect its ability to develop revolutions.
  • Fuel and air filter clogged.

When the throttle is depressed

If the lawnmower stops when throttle is depressed, the following conditions can be observed.

  • A more common variant is the failure of carburetor adjustment, which appears when there are significant loads on the drive after long periods of inactivity of the mechanism or when using it in harsh conditions.

If the problem is related to the carburetor unit, you can recognize it by the appearance of vibration of the lawnmower. When the hose is cracked or the cable is stretched out. these components should be replaced.

At High RPM

When the grasshopper stalls at high speeds, it is due to the following malfunctions:

  • When the valve located on the gas tank lid is clogged or jammed;
  • the carburetor is unbalanced due to the vibrations that occur during operation of the mechanism;
  • circulation problems fuel mixture;
  • atmospheric air suction;
  • the hose that is intended for the fuel intake is cracked or loose.

The carburetor is adjusted based on the operating instructions for the trimmer. You can adjust the carburettor by loosening the screws on the carburettor body. If there are problems with the circulation of the fuel mixture, then it may be little by little entering the carburetor. The engine stops working at high engine speeds after it has been pumped.

lawn, mower, speed, shuts, down

Right after starting

The machine may stall immediately after starting if the carburetor is misaligned or improperly adjusted. It causes an irregular fuel supply. As a result, the unit clearly vibrates. To fix the defects, readjust the carburetor, following the instructions to the mechanism.

In addition, the engine stops when the fuel valve is clogged. In such cases, it’s quite easy to clean it. If the hedgetrimmer starts but then stops right away, the fuel may be having some difficulty getting into the carburetor assembly. The problem can be solved by loosening the valve, which allows free circulation of fluid in the system.

Also the stop can be caused by air leaks in the presence of mechanical damage to the hose (holes, cracks) that receives the fuel. In this case, increase the revolutions of the drive to remove air bubbles from the system more quickly.

Where to look for the cause or where to start checking

All chainsaws have the same design and work according to the same principle. Read more about chainsaw construction in this article. STIHL, Husqvarna, ECHO, Champion, Partner, Sturm, and other brands are not important. The problem, which appears in the form when the chainsaw stops when you press the gas, can occur equally on expensive and high-quality tools, as well as on the budget Chinese devices. If there is a problem, it needs to be solved.

A chainsaw is a system of mechanisms made up of parts. Any part in the mechanism can fail, causing partial or complete failure of the tool. If the tool’s engine starts, it does not necessarily mean the chainsaw is in good working order. When the engine stops working when the engine speed is increased, it means there is a reason for it. In this malfunction, you should pay attention initially to a number of the following mechanisms of the tool:

  • Gas tank. make sure you have fuel. If the fuel is in sufficient quantity, you should also check the serviceability of the fuel filter, the presence of a connection of the supply hose to the carburetor, as well as to make sure the breather is working

These are the main parts and mechanisms that should be checked first, if there is a malfunction, when the chainsaw stops when you press the gas pedal. There are other reasons why a chainsaw engine shuts down when the throttle is pulled. What else can contribute to this malfunction, as well as troubleshooting tips, are listed below.