Adjustment of engine speeds MTD. Limiting maximum revolutions

Repair of an electric trimmer for grass

The electric trimmer for the grass replaced the usual spit. Today, most urban residents do not even know how to use a “rare” tool correctly. A modern person does not need this, because he has an electric counterpart. But if an ordinary braid had to just sharpen from time to time, then things are more complicated with the power tool. Equipment requires a certain care, and if a malfunction occurs, the repair can lead to big expenses. However, it does not always make sense to carry the failed tool in the workshop: often you can cope with the breakdown on your own.

To understand what exactly can break in an electric cost, first you should figure out how it is arranged.

Ethletric trimmer for grass usually consists of the following elements:

The current is supplied to the power unit through the connector on the case, to which the cable is connected. Inside the rod is hollow. it plays the role of a protective shell for a flexible shaft, transmitting torque from the motor to the coil of the trimmer for the grass. The handle located on the case has a button, when pressed on which the device turns on.

The described design is considered a classic. However, there are options for executing the tool in which the motor is located in the lower part near the coil, as well as the battery versions.

Repair of an electric trimmer for grass with your own hands: Frequent causes of breakdowns

One of the scenarios in which the tool is out of order is the mowing of a very neglected area. In this case, the equipment is affected by increased loads and often fails of the power unit. A breakdown of bearings or coils is also possible.

And when work is carried out in rainy weather, electrical equipment can simply close. Also, do not forget about a certain resource of individual assemblies of the tool, which are not designed for constant use. The device requires timely inspection with the replacement of worn parts.

Repair in some cases can be carried out independently, without the involvement of specialists, the cost of which is often considerable.

adjustment, engine, speeds, maximum, revolutions

Repair of the launch button

If the tool does not respond to attempts to turn it on, two options for a malfunction are possible. a cable break inside the handle or the failure of the inclusion button.

Important! Make sure that the device is disconnected from the network if it is a stationary type. In the case of the battery version of the instrument, the power terminals should be first disconnected, and only then proceed to repair.

In order to understand what exactly the breakdown is, you need to disassemble the handle.

Having gained access to the inside, you should, armed with a multimeter, measure the resistance of the button. If it is absent after pressing, the button must be replaced.

You also need to check the contacts of the connection of the power cable with the contact group. Often the need for such a measurement disappears, t. to. The cliff can be found with the naked eye. In this case, it must be eliminated by soldering.

In the absence of a multimeter, the same work can be done using an indicator screwdriver. To do this, after disassembling the body of the power cable handle, it is connected to the network and the phase is checked by a screwdriver before and after the button. If zero comes to the button, the fork in the outlet can be turned and measured again.

Attention! You should be very careful when checking the presence of a phase in this way. There is a possibility of gaining electric shock!

Checking the electric motor

If the button and cable that feeds the tool will be serviceable, you should go to the diagnosis of a power unit. To do this, disassemble the case in which it is located. It is usually necessary to simply unscrew several bolts or screws and remove the lid.

First of all, you need to check the condition of the collector brushes. The wear of this node can lead to unstable operation or to a complete stop of the engine. If the brushes are in satisfactory condition, you should check the winding of the motor for a short circuit.

For this operation, it is necessary to completely remove the engine, and then check all the collector plates in the mode in the mode. The device should not show significant deviations in measurements.

The second check is the “ringing” of the rotor winding to the “mass”. To do this, you need to connect one of the multimeter contact to any collector plate, and the second to the “mass” of the rotor. In this case, the resistance measurement mode should be more than 1 MOM. If there is no short circuit, the device will show a very large meaning.

If, according to the results of these checks, all the parameters turned out to be normal, you need to measure the resistance of the stator winding. Indications should be similar, as in the case of the rotor. If not, then the malfunction lies in the stature.

If there is an interval circuit in the engine, it will not be diagnosed in this way. However, this problem can be identified by observing the trimmer for grass in action. An indirect sign of such a malfunction will be a decrease in the power of the work and overheating of the equipment.

When, as a result of diagnosis, it became clear that the engine was “burned out”, it would be easier to notice it on a new. In the vast majority of cases, repairs, consisting of rewinding, will cost as much as a new power unit.

If the engine is installed on the engine, then it will turn off the power when overheating. If the problem is the malfunction of the relay itself, this can be identified using the same multimeter or tester. With a cold engine in good condition, the relay should pass the current.

Mechanical malfunctions

Such problems include a breakthrough of the flexible shaft. It is easy to recognize it. the motor works, and the coil with a fishing line does not rotate.

The reason for the breakdown is the unfair care of the tool, which consists in the timely lubrication of the inside of the bar. In the absence of the desired amount of lubrication, the shaft will be subjected to excessive friction and the cliff will become a logical result.

This breakdown is corrected by replacing the shaft, which can be removed by disconnecting the upper part of the trimmer for the grass from the bar. If the second part of the shaft is not extracted, disconnection and lower.

When installing a new shaft, it should first be lubricated.

Such a malfunction can occur only with a classic layout of parts. In devices where the power unit is located in the lower part, there is no flexible shaft. However, with such a layout, the role of the gear ratio is played by a bearing located on the engine shaft closer to the place of transmission of the moment. In this situation, the bearing must simply be replaced with a new.

What the engine shaft speed depends on what depends?

On the speed of rotation of the motor shaft, as well as the cutting tool of a trimmer for grass, affect:

  • the position of the gas trigger;
  • motor operating mode;
  • purity of fuel and air filters;
  • load on the cutting tool;
  • The technical condition of the engine.

The gas trigger through the cable controls the position of the air damper (throttle) of the carburetor, so by clicking on it, you open the throttle. The carburetor is based on the Venturi effect, that is, the ability of passing air to carry fuel particles behind it, and the diameter of the air channel and the fuel nozzle is selected in such a way that the ratio of air and fuel is always optimal.

That is, pressing the gas key leads to an increased air flow, and therefore fuel, which in turn increases engine speed.

The carburetor is equipped with a switch of modes (launch/work).

During the launch, the operator includes the corresponding mode and covers the supply of most of the air, strongly enriching the fuel mixture.

Then he puts the switch to the operating mode, restoring normal air supply. Read more about these modes here and here.

Fuel and air filters create a certain obstacle to the movement of air and gasoline, however, this influence is taken into account by the developers in determining the diameters of the channel and the potpel jacket.

As they become contaminated, the influence of both filters increases, due to which the ratio of the fuel mixture changes and the utility coefficient (efficiency) of the motor falls strongly, so even the maximum pressing of the trigger does not lead to a noticeable increase in engine speeds.

While the engine operates without load, even a little pressing on the trigger is enough for promoting to maximum revolutions, however, during the mowing of the grass, the revolutions fall, so you have to strengthen pressing. Thus, the operator regulates the power of the motor and the speed of rotation of the cutting tool, providing good mowing.

A working motor effectively converts the fuel mixture into the energy of rotation of the shaft, however, any defect in this mechanism reduces its efficiency.

Why does the lawn mower do not develop full power and stalls?

Here are the most frequent reasons why this happens:

Excessed gasoline

If you leave the fuel in the trimmer and put it on winter storage, then it is highly likely that by spring part of the most light hydrocarbons will evaporate, due to which the combustibility and ignorance of the remaining liquid will change.

Even if you manage to run the engine with exhausted fuel, it is pointless to expect high power from it, because the carburetor forms a fuel.air mixture with proportions designed for normal gasoline.

Read more about this here (not starting).

To correct the situation, do the following:

  • Drain all the old gasoline, including from fuel tubes;
  • Pour normal fuel or mixture of gas with oil;
  • pump up a combustible primer;
  • Twist 20-30 times by the hand starter cable to pump fuel along the carburetor;
  • If the motor starts up normally, then start mowing the grass, if not, then unscrew and dry the spark plug, then screw it into place and regularly start the trimmer for the grass.

Dirty fuel or air filters

Dirt reduces the throughput of filters, which negatively affects the composition of the fuel mixture, which means reduces engine power.

To check the air filter, remove the cover covering it and pull the cartridge out (on many trimmers its role is played by a piece of foam rubber).

adjustment, engine, speeds, maximum, revolutions

If it is clean, check the fuel filter element, otherwise replace or check as described in the instructions for the operation of your device.

To check the fuel filter, pull it out of the fuel tank through the passage or pouring hole. If it does not go through the passage hole, but it does not work out through the filling, use the wire hook.

If necessary, replace the filter and lower it into the tank, read more about such work here (the lawn mower stalls) and here.

Incorrect adjustment of the gas cable

Gas trigger and carburetor connects a special cable together. To check its work, remove the engine cover and, pressing the gas trigger, visually evaluate the angle of rotation of the sector to which the cable is connected. If it is at least 30 degrees, then the reason must be sought in something else.

If the rotation angle is smaller, then disassemble the handle and carefully check all the cable mounts, pay special attention to fixing its outer shell in the handle and on the carburetor. Having discovered the loosely fixed part of the cable, securely fix it again check the angle of rotation of the carburetor sector.

Closed carburetor

This happens if low.quality gasoline with high ms is often poured into a trimmer tank for grass. This fuel forms tarry deposits in the carburetor, which reduce the throughput of the channels. Such deposits in the needle area regulating fuel supply in maximum power mode are especially dangerous.

Try to unscrew the screw slightly, which regulates the fuel supply in maximum power mode, if the speed is raised, but do not reach the maximum, then press the gas key for 2-3 minutes and release it.

Perhaps this operating mode will break through a cork of oily deposits, after which the motor will again begin to issue maximum power. If this does not help, then the carburetor will have to disassemble why experience and tools will be required, so if they are absent, we recommend that we take Motokos for such a repair to the workshop.

How to use electric lawn mowers correctly?

The use of these devices implies not only the mowing of grass, but also the maintenance carried out before and after the mowing.

In addition, for new devices, the correct assembly is also needed, because most of them are delivered in the form of individual nodes located in a common box.

Since the assembly methodology of each model is individual, we recommend that you carefully read the corresponding section of the instructions for the operation of the device, which is also often called the user manual.

Preparation for work

Preparation for work begin the external inspection of the device, paying special attention to the integrity of the insulation of the wires, including extension cords, in addition, do not forget to check all threaded joints. In addition, carefully inspect the mowing housing, if cracks or dents are found on it, then you can’t use such a device, first it must be disassembled and the condition of the internal parts and mechanisms is checked.

If everything is in order, then install the device on a flat surface, connect via extension cord to the outlet and turn on the engine. the mitch should work without knocking or vibration. After 10–20 seconds, if the smell of smoke does not appear, turn off the engine and disconnect the extension cords from the network.

then first eliminate their causes and only after that, having completed another check, proceed to the mowing of grass. In addition, do not forget to check the condition of the cutting edge of the knife, turning off the device from the outlet and waiting for the end of the rotation of the engine shaft.

If the knife is stupid or damaged, then replace it with a new one or sharpen it with subsequent balancing.

In drum mowers, check the condition of the drum plates and sharpening the knife, if the knife is stupid, then sharpen it, strictly following the operating instructions.

If you are planning to work with the grass collector, then check its condition and install it on the lawn mower to make sure that it adjacent.

Having discovered a loose fit of the traumatic collector, remove and eliminate the reason that is most often noticed during cleaning the grass.

Also check the ease of rotation of the wheels, if one or more of them rotate tightly, then check the condition of the bushings or bearings, if necessary, cleaning them from the grass.

If it is recommended to lubricate bushings or bearings in the operating instructions, then do this by finding the slightest resistance to rotation.

In addition, remove any solid items from the site, including:

The mowing of the lawn

Let’s move on to the question of how to mow grass properly. Start the mowing of the grass by unwinding the extension cord and laying it with large loops to exclude twisting when removing the mower from the outlet. Can be laid with a snake or in any other way, the main thing is that during the removal of the mowing he does not get confused and does not be in the way of moving the mower.

Then set the optimal section for this section, then first connect the cable to the outlet, then the lawn mower to the cable.

For ease of work, fix the cable using special mounts to exclude disconnecting the plug of the lawn mower from the cable socket.

On the vast majority of models, the engine is turned on using a button and lever, this is described in more detail in the operating instructions. Having turned on the motor, move the mower in the direction of the outlet, the non.self.propelled model smoothly push you in front of you due to your physical strength, activate the self.propelled drive using a special lever.

The speed of movement should be such that even a meeting with thick grass does not lead to a decrease in engine speed (they are controlled by ear). If the revolutions have fallen and the sound of the mower has changed, then stop moving forward and hand it a little, then continue moving forward, but already at a lower speed.

When working in the rear emission mode, including with an installed grass collector, a snake is the optimal trajectory of movement along the area of ​​the optimal trajectory.

How to adjust RPM/Engine speed on newer Briggs-Stratton engines with OHV.

To do this, first, on the edge of the site, remove to the maximum distance, then unfold the mower and shift to the width of the mowing sideways, then move the device towards the outlet.

If the turn is right, then the extension cord should be to the left of the mower, if left, then on the right. To reduce the likelihood of a wire fall under the knife, it can be thrown through the elbow of the corresponding arm. That is, when turning to the right to throw through the left elbow, and when turning left, through the right.

When working in the side emission mode, the cable should always be on the opposite side, and to reduce the likelihood of falling under the knife, it can also be thrown through the elbow.

When working with the grass collector, follow not only the indicator of its filling, but also the sound that the lawn mower produces. If the sound has changed, but there is no section with thicker grass, then the grass collector is full, so it is necessary to stop the engine and remove the mowed grass.

What clothes to use

The choice of clothing affects the safety and efficiency of mowing grass.

A dangling sleeve can hook and block the lever of the knife or wheel drive, and the probability of falling when working in shoes on slippery soles is very high.

Therefore, to work with a lawn mower, you need:

  • shirt with long fastening sleeves;
  • long pants made of dense fabric;
  • foot covering the leg on strong corrugated soles;
  • protective glasses or mask;
  • Hat or cap (on a hot sunny day).

How long can you use?

The optimal operating mode for each model is described in the operation manual for the lawn mower.

If this document is not available for some reason, then adhere to the Rules 15/10, that is, mow the grass for 15 minutes, then wait 10 minutes until the engine cools down.

Malfunctions and repairs: how to diagnose and fix

Here is a list of the most common faults:

  • The engine does not turn on or periodically.
  • The knife does not rotate when the engine is turned on.
  • Strong vibration of the lawn mower.
  • The apparatus does not mow grass poorly.
  • The engine is very hot or the smell of smoke appears.
  • The self.propelled mower does not go forward well with a pressed wheel drive lever or does not go at all.

Does not turn on or periodically turns off the electric motor

The most common cause of such a malfunction is to turn off one of the forks from the corresponding outlet. This is due to the fact that they pulled the extension cable too much and he pulled out the fork from the outlet. If the motor worked and suddenly turned off for no reason, then go along the entire extension cord and check the contacts.

If all forks are inserted into the appropriate sockets, then check the voltage in the network, perhaps, together with the lawn mower, some additional electrical appliances of high power and power consumption have reached a critical value.

When this happens, fuses (traffic jams) are triggered, so you need to check them, if they are turned off, you will have to look for an additional electrical appliance, which increased the load on the network to a critical value.

If you do not turn off the device, then when turning on or long.term operation, the lawn mowers will work traffic jams that protect the home power supply from overload.

In old houses, faulty wiring gives the same effect, in which poor contacts under load heat up, which leads to:

To check such a wiring, current measuring ticks will be required.

Do not use any other measuring devices for this, because only current.measuring ticks allow you to perform such work without direct contact with electricity.

Remember. touching a bare conductor or contact, which is under voltage of 220 volts, is deadly!

First, turn off all electricity consumers, then measure the current at the entrance to the house, if the wiring is working and did not forget to turn off any electrical appliance, then the current consumption will be zero. Then connect the lawn mower and ask the assistant to start the mowing of the grass so that you can measure the current in the extension cord.

It must correspond to the power of the braid engine, which can be determined by the formula p = iu, where:

Having made sure that with mowing grass, the current consumption corresponds to the power, turn off the mower from the network and connect the ticks to the entrance wires along which the electricity enters the house, then ask the assistant to continue the mowing of the grass and observe the current, waiting for the traffic jams to train.

If a current jump is detected, then the wiring is faulty and requires replacement.

If the current increases not only at the entrance to the house, but also in the extension cord, then the problem is either in the extension cable or in the mower itself, so first replace the cable.

If this did not help, it is necessary to disassemble the mower and carefully check all the contacts, as well as the condition of the engine windings. However, for such work, it is necessary to understand the electrical engineering well and be able to repair it, because it is necessary not only to repair the damage or replace a defective part, but to eliminate the cause that led to such a defect.

If you do not know how to do this, then contact a specialized workshop.

The knife does not rotate when the engine is turned on

The reason for such a malfunction may be:

  • chopped engine bearing;
  • a chopped knife shaft bearing (only on mowers with a collector engine);
  • weak tension of the knife drive belt (only on mowers with a collector engine);
  • weak tightening of the bolt fixing the knife;
  • Loss of a knife.

To establish the exact cause and fix, turn the electric lawn breeze upside down from the network and twist the knife.

If it rotates without resistance, then the lawn mower has one of the following damage:

  • knife fixators are cut;
  • The knife attaching bolt is not twisted;
  • torn or stretched a knife drive belt;
  • Distributed pulleys of engine or knife.

To check the tightening of the bolt, shake the knife, moving one or the other edge from the seat, if the screw is not tightened, the knife will hang out, if it sits tight, then the problem is in something else.

To check the locks, unscrew the bolt, then remove the knife and inspect the seat for it. if the locks are damaged, this will be immediately visible.

To check and adjust the tension of the knife belt, you need to remove the engine, so we recommend that this operation independently only if you are well acquainted with the device of your mower and know how to remove and put it in place of its electric motor. This process is not the same on various braids, so it is impossible to prepare universal instructions.

After dismantling the engine, do the following:

  • Check the condition of all parts of the belt tensioner, bearings, rubber rings and springs should be intact;
  • Remove the belt and check its length (for this house there should always be a spare belt);
  • Check the condition of both pulleys, paying special attention to the inner surface where the belt passes and fixed the shaft.

Refresh or replace faulty parts, then collect the mower and check the work of the knife. As an example of such a repair, we suggest you see this

Strong vibration of the lawn mower

Strong vibration arises due to the fact that the knife:

An external inspection, even without removing a knife, will detect its deformation or poor fixation. If it is not bent and is normally fixed, then injected, as described above, then install on a mower and check its work.

How to properly adjust

Before setting up the carburetor trimmer for the grass, it is necessary to do the following:

  • Rinse the engine;
  • replace or clean the spark plug;
  • change to a new one or clean the air filter (it is recommended to lay it out in warm, soap water, squeeze it out and let it dry well).

It is also necessary to install the cord of the right diameter in the trimmer coil or install knives-this is done so that in the process of configuration the engine has at least some load. After installing a cutting tool and starting a gasoline engine, let it warm up for 10 minutes.

If at the idle speed of the motor you noticed that the cutting tool rotates, then it is necessary to reduce engine speeds. This is done using the lower idle regulator, often marked with the letter “T”. The figure below shows the placement of regulators on the trimmer Husqvarna.

But, for example, on the STIHL trimmer, this screw may have a label “LA”.

So, turn the idle control regulator to the left, until the trimmer head is completely stopped.

To configure the carburetor, 3 regulators are used (screw).

  • The right regulator L tunes the level of enrichment of the combustible mixture at low speeds. It needs to be adjusted by the first. Get a maximum of turnover at idle. This is done using the regulator L, turning it to the left and right. After finding the point of maximum revolutions, return the regulator for half a turn to the left (against h. Arrows).
  • The lower regulator t (LA) is used to configure idle. Turning it to the left, the engine speed will begin to decline, and when the regulator is turned to the right, the revolutions will increase.
  • Left regulator h is responsible for enriching the combustible mixture at high speeds. The enrichment configuration completes the adjustment of the carburetor. Also, using this regulator, you can configure maximum speed, fuel consumption and engine power.

Important! If you allow the engine to operate at full speed for more than 10 seconds, then it may fail.

To exclude this trouble, adjustment will be required. With the working motor, give a full gas, then turn the “h” regulator to the right until a reduction in revolutions begins. After that, the “h” regulator must slowly scroll to the left until you hear the uneven operation of the engine. Then the regulator “h” should be rotated to the right until the moment of flat operation of the motor is heard.

After conducting the above actions, the setting of the carburetor can be considered completed. After proper adjustment, the engine must confidently gain momentum, a little four at a maximum of revolutions, and when working, an idle cutting tool should not turn. This manual is suitable for adjusting carburetors on the Huter, Patriot and others benzocos.

There are also carburetors without a screw that is responsible for enriching the combustible mixture at low speeds. That is, they have only 2 adjusting screws: a idle regulator and a quality fuel mixture regulator at high speeds. How to configure a carburetor of this type, you can find out from this video.

VCDS Idle RPM correction. VCDS Idle RPM adjustment

The most common problems

Here are the most common malfunctions:

  • the engine does not start;
  • The motor stalls arbitrarily;
  • The engine does not gain momentum or does not hold them;
  • Immediately after the start of the mowing, the engine speed falls and it stalls or works with interruptions;
  • smokes strongly;
  • It goes badly;
  • does not stop even after the operator released the wheel drive lever;
  • shakes hard;
  • Poorly cut the grass.

The engine does not start

There are quite a lot of reasons why the motor does not start:

  • empty fuel tank;
  • a air filter is clogged;
  • a muffler is clogged;
  • The ignition switch is installed in the wrong position or faulty;
  • The air damper control lever is in the wrong position;
  • faulty candle;
  • broken or clogged carburetor.

Primary inspection

To establish the real cause of this defect, you must first conduct a full external inspection and make sure that the openings of the air filter or muffler are not clogged, there is gasoline in the tank, and the throttle control lever and the ignition switch are in the correct position.

If everything is in order with this, then it is necessary to carry out pre.launch work, including cleaning air or fuel filters, described in detail in the instructions for the operation of the mower, and then try to start again.

After making sure that the motor still does not start, the mowing is placed on the table and proceed to a more detailed search for the reasons.

First, the spark plug is twisted and tightly plug the candle hole with your finger, then smoothly, but quickly and strongly pulled the hand starter cable or pressed on the electric launch button.

The moving piston should create sufficient air pressure so that it pushes the finger and goes outside. If this does not happen, then the motor needs serious repairs, which is difficult to make at home, so it is better to take the mower to a specialized workshop.

After all, the reason that the piston does not move after the starter’s cable or rotating the shaft of an electric starter may be:

  • Damage to the starter, because of which he does not transmit the energy of rotation to the engine shaft;
  • The cut off the flywheel that connects the flywheel and the starter with the engine, and also provides the correct ignition angle.

To eliminate both malfunctions, not only tools, but also skill are needed, so those who do not have the skill of repairing any engines are better not to try to eliminate such problems on their own.

Further check

If the piston moves, then you must first check the fuel supply, for which the candle is thoroughly wiped with a dry clean rag, then screw it into place, and the regulator of the position by the air damper is placed in the “OFF” position, as during the start of the engine.

After that, the fuel is pumped up (if the engine design provides) and twitch the hand starter cable several times or pressed on the electric starter button and hold it for 1-3 minutes.

Then, the lever of the air damper is transferring to the “ON” position and the candle is unscrewed, which is carefully examined.

Wet contacts indicate that gasoline enters the engine and the problem of ignition, and dry contacts say:

In both cases, knowledge and equipment are necessary for proper diagnosis and repair, therefore, it is better to take the device to repair the apparatus to a specialized workshop.

If the fuel comes, then it is necessary to check the external condition of the ignition coil and the high.voltage wire. If they have cracks or poor contact as between the wire and the coil, so at the place of connection of the wire with the candle tip, they must be replaced.

If everything is fine, then you need to check the spark, for which you can use both a deliberately serviceable candle and a bolt suitable in diameter, which is inserted instead of a candle in a high.voltage wire.

The operations described below, if they are performed with errors, can damage the ignition coil, so if you are not sure that you can do everything right, then it’s better not to take risks and entrust such a check to professionals.

The candle is leaned with threads against the ribs of the engine cooling shirt, and the bolt is placed so that it does not come into contact with the mowing case or its engine, and the distance from it to the cooling shirt was 1-2 mm.

After that, disconnect any wire going to the ignition switch, then pull the lever of the manual starter or press the electric button and see if the spark will appear.

If there is no spark, then the device does not start for one of the reasons:

For the repair of these damage, skills and equipment are needed, so those who do not have them are better to trust professionals. If there is a spark, then the problem is in the spark plug, so after replacing it will work.

The motor stalls arbitrarily

The most frequent reasons why the engine stalls during operation are:

  • Dirty air filter;
  • Dirty fuel filter (only for models with a fuel filter);
  • faulty ignition switch (does not completely open the ignition circuit);
  • damaged insulation of the ignition shutdown wires;
  • faulty air damper drive;
  • the tightness of the ignition coil is broken or its winding is broken.

The primary inspection is performed in the same way as described in the previous section. If everything is fine outwardly, then carefully examine and feel all the wires suitable for the switch that blocks the operation of the ignition system, is possible somewhere damaged and when contacting the naked metal of the case, there is a short circuit that extinguishes the spark.

A gasoline lawn mower is a complex motorized equipment that needs proper timely maintenance and periodic repair.

Now you know what malfunctions can independently eliminate most of the owners of gasoline lawners and how to do it, and in which cases it is better to contact the workshop.

How to understand that the carburetor of the lawn mower needs to be adjusted

The following signs may indicate this:

  • Difficult launch of the motor, weak speed set.
  • Increased fuel consumption.
  • The engine works unstable, the speed is often jumping.
  • There is a large amount of exhaust gases.

Find out whether the carburetor is correctly adjusted, checking the spark plug will help. First we release it from the casing, disconnect the contacts from the igniter.

Clean the candle nest with a device that pumps the air. For this purpose, a compressor with a small tube is perfect. Using a dynamometric key, we remove the candle.

After pour the sparkle with the spark plug for flushing the thread into the nest, unscrew the candle to the end after a short period of time. If the electrodes are black, then this is a dozen that is associated with poor carburetor adjustment. If she is a brick shade, then everything should be in order with a gas station.

After a long period of downtime, the tool also needs to be adjusted. For example, after winter.

It is also recommended to set up a setting when changing the composition of the fuel mixture: oil or gasoline.

How to adjust the carburetor of the lawn mower with your own hands


  • Run the motor. When it is launched on the XX, knives should not rotate, but if the opposite occurs, then we reduce the speed of the idle.
  • We adjust the screw l. He is responsible for the mixture at low speeds. First, scroll to the stop clockwise, then unscrewed 90 degrees against the sentry. If you find failures, we repeat this action, weakening it for 1/8 part, that is, 45 degrees.
  • Adjust the La screw, more frequent name. t. With an increase in speed XX, more air is added to the mixture. Power is lost. But if there is not enough air, fuel is burned worse. We unscrew the screw so that it works perfectly at low speeds, while the knives should not rotate. In the process of setting, you need to feel momentum, it should work stably on XX.
  • Adjust the screw h, which sets up the mixture at high speeds. To identify their maximum quantity, we use a tachometer. Upon reaching the largest number of engine speed, we unscrew the screw to the left by 180 degrees, the adjustment on this ended.

Sometimes only the correct setup and the use of the device reveals its entire potential. No need to neglect it and conduct as necessary.

The spring may interfere

My first attempt to adjust the gas mowing carburetor did not give anything, since the spring of the fuel mixture adjustment propeller prevented. The factory spring turned out to be too thick in a compressed state and did not make it possible to reduce the supply of fuel to the required level. I had to choose another spring and continue the adjustment after its replacement.

The adjusting screw for feeding the fuel mixture with the spring

In the photo above the factory spring, below the adjusting screw with a selected spring. I am writing about this, because I am not sure that this is an isolated case, and someone else may face the same situation.

From personal experience

lawn mower or trimmer for grass

Trimmer for grass is a broader concept than a lawn mower (lawn mower), since it can also be an electric. The gasoline trimmer for grass and the lawn mower is the same thing.

Some authors assure that a trimmer for grass is a weaker tool, unlike a more powerful lawn mower, which can be used to mow shrubs. Personally, I have a tool with a maximum capacity of 1.7 kW and capable, as stated in the instructions, to mow a small shrub up to 10 mm thick. User manual is called “trimmer for gasoline grass”.

The proportion of the fuel mixture

I read somewhere that if the law mowing manual and the canister with butter indicates different proportions of the preparation of the fuel mixture, the proportion indicated in the manual should be used.

It was done for a long time. excess oil flowed out of the engine to the gas tank and the fiber was constantly formed on the candle, since the leadership indicated a proportion for a engine 1:25, and on the canister. 1:50. After the transition to a proportion of 1:50, the appearance of oil fluxes stopped. The candle continued to burn, but with less intensity (the carburetor has not yet been adjusted).

Until now, some users of the benzo tool determine the fuel mixture “by eye”. If when preparing the mixture the amount of oil is underestimated, after a while an extraneous sound may appear immediately after the engine starts, gradually disappeared during heating, and the engine stop occurs with a sharp jerk. The continuation of the operation of a trimmer for grass in this mode will lead to its failure.

Clead cleaning

In the worst times of the work with a trimmer with an unresolved carburetor, the engine stopped starting after using each fuel tank. And only after cleaning the candle from the car, could you continue to work.

For cleaning the electrodes, fine sandpaper was used, and a thin stationery clip with a bent end was used to clean the space between the insulator and the case. At first, the electrodes were wiped with high dirt with a rag, then cleaned with sandpaper. After that, the candle fell into the diesel fuel and the moistened carpet was opposed by a paper clip from the surfaces of the insulator, the inside of the body and between them. Further, the candle fell several times into the diesel fuel, which then shake off it along with the pollution. Sometimes the procedure for cleaning a paper clip and washing were repeated. After that, the candle wiped dry and was ready for further operation.

Incredibly, one fuel mixture tank with an unresolved carburetor can be spent in less than 10 minutes. verified in practice, when the trimmer for the grass was launched and operated at high speeds with maximum fuel supply (the adjusting screw was unscrewed much more than the norm).

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Lawn mowed MTD PRO SPB 48 HW, power loss, increased noise to the beat of the engine.

The Lawn mowed MTD PRO SPB 48 HW is equipped with a Briggsstratton 175 SS engine. The mower is not new, but in very good condition, you can see. They take care of her.

The mower entered the repair due to power loss, the engine works steadily, but louder than usual. There may be several reasons for the loss of power, if there are no other symptoms, as in our case, start checking simple things. Check the ignition system, integrity of wires, candle cap. Replace the candle with a new or obviously serviceable if there is no positive result. Check the air filter, run the engine without a filter. Check the power system, perhaps a fuel or a carburetor is clogged if you are not sure of the quality of the fuel. Replace it. In the case when the malfunction is accompanied by increased noise, smoke, various kinds of knocking, grinding. First, we find out what is the source of these manifestations, after which, if the cause of the loss is not in this, we carry out the above procedures. In our case, the noise source is between the silencer and the engine, the nature of the noise is similar to a burnt pad. In order to find out which of the gaskets burned out we disassemble the upper part of the engine.

To do this, remove the air filter housing, the filter itself, the starter, the upper casing.

With the casing removed, it is clear that the cause of the malfunction is a burdened gasket of the cylinder block head. We start dismantling the head. Remove the carburetor, unscrew the air filter housing, which is attached with two bolts.

We do everything carefully, we try not to damage the gaskets and sealing rubber rings. Spare parts for these engines are not always available. Details need to be ordered and wait, sometimes a month, in the season this is a real problem.

The reasons that the trimmer for the grass does not develop momentum

External signs

The reasons are that the lawn mower is not gaining momentum, vary. Some are not even related to the breakdown of the device, for example:

  • Getting on the filter of dirt or dust.
  • Pouring low.quality fuel mixture.
  • Using poor gasoline or overdue oil.
  • Pollution of the engine components, which does not allow the instrument to gain momentum.

In the case of pollution on the carburetor, he sees a lot of soot. It is the reason that the trimmer for the grass does not gain momentum.

Internal problems that the gasoline trimmer for grass does not develop momentum

Technical malfunctions are manifested in both old and new devices. Do not be surprised. even a new trimmer engine for grass may not develop revolutions. Check the ignition system and supply of the mixture for serviceability:

  • Когда коса для травы заводится и тормозит или даже не заводится, то проблема может быть в свече. A dark carrion appears on it. a sign of poor.quality gasoline and poor carburetor work.
  • A flooded fuel hose is another problem due to which STIHL is not gaining momentum.
  • With prolonged work without cleaning parts, a muffler can clog. Check the system for the presence of dark particles and clean the pipe, then the motor will start and start working as a new.

If the problem is in the motor itself and you do not know what else to do, be sure to take it to any master. You are unlikely to do something inside the motor, all the more right. And you will always have time to harm the device.

Serving parts of a benzotrimmer to prevent a problem

In order not to in vain to disassemble the motokos, it is worth diagnosing each zone separately. the problem can be in both one and several parts. Where to look and what to check.


One of the main nodes of the correct work of the trimmer for grass. So that the part functions as necessary, adhere to the conditions:

  • Each month to remove and clean the part;
  • Configure idle, according to the manufacturer’s instructions;
  • If you yourself cannot set up. take the master.

One of the popular reasons for the breakdown of the motor. the carburetor cable is not pulled. To eliminate the problem, you need to disassemble the carburetor first, clean it, and only then tighten the cable. Just do not overdo it so that it does not pull like a string.

It is worth checking additionally: an intake needle, a membrane, a setting lever, a damper and other components of a carburetor. They may also have problems that interfere with the correct work of motorcycles.

Spark plug

Even if you don’t know what a normally working candle should look like, just remove it, dry it and clean it with sandpaper. Return the part to the place.

You can also check the distance on the main part. Maximum. 1 mm gap between parts of the fabric.

If the candle is too black, then there is no point in cleaning it. just buy a new one and install it on the motor. Then the whole system will work with new forces.

Filtering system

The blocking of an air filter can sometimes affect work even more than problems with the candle. To check if it is a problem. run the engine with the filter removed. If you started, rinse the filtration sponge in gasoline or other moisture. And you can buy a new one. this will only benefit your trimmer.

The clogged filters do not let the fuel mixture into the motor, so it stalls or does not start. The lack of gasoline can be fixed with banal cleaning: both a filter under the lid and the filter of the fuel hose (located inside the plastic tank for fuel).

Motor malfunctions

Internal combustion engine. the basis of the operation of the gasoline apparatus. What may be wrong with him if the motor does not gain power:

  • The fuel mixture is incorrectly prepared, or its expiration date has long been released;
  • The piston rings broke;
  • Cylinder or piston in scratches and cracks;
  • The device is used without breaks.

With the repair of the motor should be careful. This is because if you incorrect all the details, then you can stay like without a trimmer for grass, and also with injuries. Trust the case to a specialist!