Repair of lawn mowers cal. Do-it-yourself repair of gasoline trimmers: tips and recommendations. Candle and candle channel

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A petrol mower (trimmer, brush cutter or gas mower) is extremely important tool in the summer, both for owners of private residential buildings and for those who like to grow their own vegetables, berries and fruits in the country. Destroy weeds or trim the lawn - all this can be done with ease by a trimmer. And much faster than if you use other methods.

Unfortunately, like any other technical device, the brush cutter sometimes breaks. For example, the engine does not work or There are problems with the carburetor or starter, even if you periodically service the unit: change the cutting line or teeth, fill it only with high-quality fuel and oil, and also constantly lubricate the gas trimmer gearbox. In order not to pay for repairs, which can cost you a pretty penny, you can study the structure of the brush cutter and carry out the repair yourself.

Trimmer device

Typical scheme, according to which manufacturers make their lawn mowers:

Typical faults

The most common breakdowns that occur during operation of the unit are:

• The engine does not work, the trimmer does not start;
• the engine manages to start, after which it does not maintain speed and stalls abruptly and for no reason;
• The mower bar vibrates strongly;
• the gearbox overheats greatly;
• low speed of the cutting line.

Before you begin repairs, read the instructions, which must be included in the kit, so that correctly diagnose.

Motor check and repair

If the engine of the device does not start, you need to check the presence of gasoline in the tank of the lawn mower. Keep in mind when you refuel your device with a specially prepared mixture of oil and gasoline, the fuel must be at least grade AI-92. To avoid engine damage, a certain amount of oil is added to the pre-calculated volume of gasoline using a syringe. Having made sure that the problem is not a lack of gasoline, we move on to checking the functionality of the ignition unit.

Troubleshooting the ignition unit we start with a candle. To check if it works, just unscrew it, bring it to the body and try to start the engine. If everything is fine with the candle in perfect order, you will see a spark flash between the trimmer body and the spark plug.

Another source of trouble is that the mixture of oil and gasoline floods the channel into which the spark plug is screwed. Try drying the channel, and also drying and cleaning the spark plug itself. You need to leave the device to dry for about one hour, then screw the spark plug back in and try to start the engine. If fuel constantly floods the spark plugs, you are unlikely to fix this kind of problem yourself, so you will need to contact a qualified specialist.

If you have determined that the source of the problem does not lie in the ignition unit, it is time to check condition of unit filters, fuel and air. The air filter will need to be replaced with a new one if, after removing the old filter, you find that the engine starts easily without it. To make sure the fuel filter is working, do the following:

• disconnect the hose from the filter outlet;
• try to start the engine;
• if the fuel mixture begins to flow out of the filter hole, then everything is fine with it; otherwise, replace the filter.

The final reasons for the engine not starting may be a clogged breather or muffler. You should make sure they are clean. If not, clean the exhaust port or breather.

Carburetor adjustment

Carburetor - enough complex element brush cutters, which should not be repaired by an untrained person on their own, with the exception of performing some simple operations, for example, cleaning the internal surface of the product from dirt without completely disassembling it. Adjusting the carburetor trimmer It is better to entrust it to specially trained people who will be able to carry out the finest adjustments without disturbing its normal performance.

Gearbox care and repair

The role of the gearbox in the trimmer is that it is an intermediary between the engine and the cutting line, transmitting torque from the motor to the lower part of the unit through two gears with teeth.

To prevent wear of gears in the gearbox and their premature failure, it is necessary to carefully ensure that they are constantly lubricated. Most manufacturers indicate in the instructions supplied with their lawn mowers that the gearbox must be filled with oil at least once a season. If you often work a lot with the trimmer or have heard unpleasant noises coming from the gearbox, you will have to check its condition and, accordingly, lubricate it more often.

To lubricate the gearbox, you will need to do the following steps:

1. Find a plug on the gearbox, the role of which is to close the technical hole used to insert new lubricant;
2. Remove this plug using the special key supplied with the trimmer;
3. Use lubricants, for example, such as Litol-24, Oleo-Mas or regular machine oil. Apply them to the gears through the hole in the gearbox. During the operation, slowly rotate the gears to achieve uniform lubrication;
4. Tighten the plug on the gearbox and start the engine. Make sure that the extraneous noise previously coming from the gearbox has stopped.

If you hear from the gearbox loud knock Most likely, the reason for this is that the bearings have worn out due to intense work, insufficient lubrication, or due to dirt getting into them. There is only one solution in this situation - replacing failed components.

If you find that the trimmer cutting element has stopped working and is not rotating, most probable cause malfunctions - wear of gears, or rather, their teeth, which no longer touch each other and do not transmit torque from the motor. The malfunction is eliminated by disassembling the gearbox and replacing the gears with new ones.

An indispensable tool for a modern summer resident or owner of a private home is a lawn mower, which allows you to effectively and efficiently put the surrounding area in order. The period of active use of brush cutters is from late spring to October. Modern units are equipped with powerful and durable internal combustion engines, reinforced transmissions and main components. Despite this, physical wear and tear, manufacturing defects or improper operation lead to failure of the trimmer. In order to repair a trimmer with your own hands, you must have at least basic knowledge in the field of technology and some experience in its repair.

The main component of any gasoline tool is the engine. internal combustion(ICE), which through in various ways transmits torque to the executive body. In a modern lawn mower, an alloy rod (pipe) is used as a transmission element between the motor and the trimmer head, inside which the drive shaft is located.

Petrol trimmer Husqvarna

Thanks to the high-speed engine, the rotation speed of the fishing line can reach 13 thousand revolutions per minute, depending on the manufacturer of the braid. In order to avoid mechanical and thermal damage to the gearbox, a special hole is provided in its housing for introducing lubricant in the form of ointments. To make it easier for the owner, the headset long work All models of brush cutters are equipped with a durable shoulder strap.

Cutting part of brush cutter

Regardless of the manufacturer, almost every model comes with fishing line and steel knives.

Trimmer cutting part

The cross-section of PVC trimmer line can vary from 1.5 to 3.0 mm.

Made of durable polymer, during mowing it is subject to intense wear and, as a result, breakage. Therefore, from time to time it is necessary to check the presence of fishing line in the head and, if necessary, replace it. It is recommended to purchase an additional bobbin to quickly replace it with a reel that has run out of line.

Controlling a lawn mower

Types of lawn mower handles

Trimmers with internal combustion engines on the market today are equipped with a D-shaped, U-shaped or T-shaped handle, where the main controls of the unit are located. For example, on a U-handle braid, the throttle key and stop/start toggle switch are located on the right handle. In the D-shaped design of the handle, the gas adjustment key is located directly on the rod.

Trimmer malfunctions and how to fix them

Due to the presence of many components and parts, repairing a trimmer with your own hands involves eliminating breakdowns that prevent it from normal operation. The most basic malfunctions of gasoline scythes should be noted:

1. The trimmer engine does not gain speed;
2. Failure of the cylinder-piston group (CPG);
3. Ignition faults;
4. There is no connection between the internal combustion engine and the trimmer head;
5. Mechanical knocks during operation of the unit.
6. Repair of CPG lawn mowers

The main component of any internal combustion engine is the cylinder-piston group (CPG), which can fail due to wear of parts or low quality fuel mixture.

Trimmer problems

Lubrication of rubbing units in a lawn mower is carried out by adding a certain proportion of oil to gasoline. This process can be disrupted due to old oil falling out as sediment. In this situation, when starting the trimmer, the motor overheats greatly and in a matter of minutes the most expensive breakdown occurs. To resolve the problem you will need complete replacement CPG, namely: piston, oil seals, cylinder and piston rings. If you are not an internal combustion engine repair specialist and do not have experience working with technicians, then it is unlikely that you will be able to fix the engine without the help of a specialist. You can find out more about the stages of repairing a piston trimmer here.

Trimmer ignition troubleshooting

If the ignition of a lawn mower fails, the spark on the spark plug disappears and, as a result, the fuel mixture does not ignite.

Spit spark plug design

In this situation, it is quite important not to rush to replace the coil, since the cause of the breakdown may be the lack of contact in the switch on the control handle.

An important point when troubleshooting the trimmer ignition will be the diagnosis of the cross section, where the distance between the side and central electrodes should be 0.5-0.7 mm. In addition, it is necessary to pay attention to the steel sealing ring on the spark plug, loss of integrity or deformation of which can lead to etching of air from the combustion chamber and, as a result, a decrease in the power of the scythe.

Ignition flywheel with coil

If replacement, checking the electrical circuit, spark plug and its contacts did not give positive results, then you should pay attention to the trimmer ignition module, namely the gap with the flywheel. Regardless of design features and the manufacturer of the lawn mower, the distance between the ignition coil and the flywheel should be no more and no less than 0.2 mm. To restore the optimal value of the gap, you will need to loosen the coil mounting bolts and use a special measuring probe to set the trimmer ignition.

Gasoline trimmer fuel system

A clear sign of a malfunction in the engine power supply system is the absence of traces of the fuel mixture on the spark plug electrodes, which may be due to the following defects:

Components fuel system trimmer

• due to a clogged hole in the gas tank, a vacuum is created, which prevents the normal flow of gasoline into the carburetor;
• due to the poor quality of the fuel and the ingress of foreign particles, the fuel filter installed in the tank is clogged;
• failure of the mixture to enter the combustion chamber as a result of carburetor clogging.

You can quickly determine the cause of the malfunction by dismantling the fuel hose leading to the carburetor. If the fuel mixture flows out in a thin stream, then you should pay attention to the carburetor. If there is no jet, it is necessary to clean the breather (a small hole in the gas tank cap) with a thin needle or replace the fuel filter.

Carburetor repair

If fuel enters the carburetor, it must be cleaned or adjusted. Adjusting the trimmer carburetor involves restoring optimal mixing of the fuel mixture.

Carburetor trimmer with adjustment screws

To do this, pay attention to three adjusting screws: maximum speed (H), minimum (L) and idle speed(LA). To start setting, you need to completely tighten screws H and L and loosen 1 turn each. Then we start the scythe and let it warm up for 10 minutes to adjust the power system in operating mode. After warming up the internal combustion engine, press the gas button all the way (12,000 rpm). We restore the idle speed by unscrewing the LA screw. As soon as the trimmer head begins to rotate, you need to tighten the screw until it stops.

Gasoline scythe exhaust system

Trimmer Exhaust System

One of frequent malfunctions lawn mowers are caused by incorrect operation of the internal combustion engine, namely a drop in power when the speed increases (the scythe stalls).

The reason for this work is that the exhaust system is clogged with particles of burnt oil. Manufacturers often make mufflers prefabricated and cleaning is quite simple. If the design of the spark arrester is non-removable, then it must be placed in water with detergents, and then dry with a regular or industrial hair dryer. Frequent clogging exhaust system indicates non-compliance with the proportions of oil and gasoline.

Repairing lawn mowers with your own hands: breakdowns and methods for eliminating them was last modified: June 25th, 2018 by Administrator

The use of various electrical devices greatly simplifies the performance of many types of work, but unfortunately, all complex products break sooner or later. Electric trimmer failure

will lead not only to the inability to carry out work in the garden, but also to significant financial expenses for repairs. It is possible to significantly save money and increase your own knowledge of how this equipment works if you repair the trimmer yourself. Before you begin this type of work, you should carefully study the operating principle of this type of household appliance.

Electric trimmer: device and principle of operation

The electric trimmer consists of:

• Enclosures with electric motor.
• Detachable rod.
• Trimmer reel with protective cover.
• Rivets for shoulder strap.

Electric trimmer device

A power cable with a plug is connected to the trimmer body, through which electric current is transmitted. In the cavity of the detachable rod there is a flexible shaft, thanks to which torque is transmitted to the trimmer coil. The device is turned on by pressing the button located on the handle of the device.

This trimmer design is the most common, but

If desired, you can find products powered by a battery, as well as with a bottom-mounted electric motor.

Do-it-yourself grass trimmer repair: common causes of breakdowns

The trimmer may fail when operating under heavy loads. This situation may arise when the treated area is overgrown with tall grass.

Mowing tall grass

When working in such areas, the engine may fail, the bearings may break, and the coil of the electric scythe may be destroyed. When operating in rainy weather or in heavily foggy conditions, the trimmer may “burn out” as a result of a short circuit.

Breakdowns of this electrical appliance may also occur as a result of frequent use. If household appliance will be used in this mode, then after a certain number of engine hours it will be necessary to carry out mandatory repairs and preventative adjustments of many parts of the electrical device.

Start button repair

If the electric scythe shows no signs of life, then a break may have occurred. electric cable inside the housing handle, or the electric motor switch button is faulty.

Start button

In order to diagnose the electrical system, you will need to disassemble the handle of the electrical appliance. The work is performed in the following sequence:

• The control handle is removed from the frame of the electric mower.
• The handle comes apart.

When access to the inside of the electric trimmer is provided, use a multimeter to measure the resistance of the electric trimmer power button. If there is no resistance after pressing, then this

the item is subject to mandatory replacement. It is also necessary to check the connections power cable with internal electrics located in the handle

device. The contacts should be checked for open circuits using a multimeter. Often such a malfunction can be determined “by eye”. After detecting a broken contact, it is enough to solder the damaged area to restore the operation of the electric trimmer.

If you don't have a multimeter diagnostic work can be done with an indicator screwdriver. For this purpose, you should turn on the plug electrical network and using this diagnostic tool

find the “phase wire” and thus check the presence of electric current before and after the power button. If phase current is detected in another electrical circuit, then it is enough to install electrical plug on the contrary in the socket so that correct diagnosis can be carried out

trimmer malfunction. The second diagnostic option should be carried out with great care, since there is a danger of electric shock when checking the integrity of the wiring.

Checking the electric motor

If the device power button and areas internal wiring turn out to be undamaged, then you should start checking the electric motor. For this purpose, it is necessary to remove the housing cover, first unscrewing several screws with a screwdriver.

Checking the electric motor

The first thing you need to do after accessing the electric motor is to check the functionality of the brush assembly. If the brushes are worn beyond the limit permissible value, the electric motor may stop completely or operate unstably. If the brushes and commutator are in perfect order, you should start “ringing” the motor winding. In order to eliminate the possibility of breakdown in both circuits, you should alternately carry out

checking the stator and rotor of the engine. To perform this operation you must:

• Remove the motor from the electric mower.
• Turn the multimeter into resistance measurement mode and check all collector plates for breaks. When checking, there should also be no significant deviations in the readings of the diagnostic device.
• Check for breakdown of the rotor winding to ground. For this purpose, one probe of the multimeter should be connected to the “ground” of the rotor, and the other to any collector plate. The multimeter must be set to measure resistance greater than 1 MOhm. In a working motor, the resistance between the winding and ground should be very high.
• Measure the resistance of the stator winding. If there is no resistance, then in this case it can be stated that it is faulty.
• If the stator wiring is in perfect order, then a possible breakdown of it to the housing is checked, in the same way as when diagnosing the stator.

Trimmer motor

When checking in this way, in 90% of cases it is possible to determine the cause of the electric motor malfunction. It will not be possible to check for an interturn short circuit, which can only manifest itself during engine operation, but it is possible to diagnose such a malfunction

by indirect signs, which manifest themselves in a decrease in the power of the electric motor and its overheating. If the electric motor is equipped with a thermal relay, then such an electric scythe, when interturn closure, will work for a short time, after which it will occur automatic shutdown trimmer. In some cases, the thermal relay can cause a malfunction of the trimmer motor, therefore, in a set of test

activities, the thermal relay must be “ringing” using a multimeter or tester.

Digital multimeter

This is very easy to do: in good condition on a cold engine, the thermal relay passes electric current, V

out of order electrical circuit will be open.

Problems with the performance of the electric scythe associated with broken wires are easily eliminated by soldering the contacts, but if the motor is “burnt out,” then you will need to perform a complex rewinding process, which can

only to be performed by a qualified specialist. In many cases, it is much easier and cheaper to purchase a new engine and install it in place of the burned one. This work can be done independently

in the reverse order of removing the unit.

If the trimmer's electrics are in good condition, then you should pay attention to other types of faults that may appear during operation of the electric scythe.

Mechanical problems with trimmer

If electric motor The device turns on, but the reel with fishing line does not rotate; the reasons for such a malfunction may be a break in the flexible shaft transmitting torque. This problem especially often occurs when the electrical appliance is not properly maintained. For example, if there is no lubrication inside the rod of an electric braid, the cable will be subject to excessive friction and within a short time this part will fail. To replace, simply unplug top part electric scythe in which the electric motor is located, after which it will be possible to remove the flexible shaft from the rod.

Flexible shaft

Flexible Shaft Lubricant

If there are difficulties in removing the second part of the cable remaining in the cavity, the lower part of the braid with the reel and shaft is disconnected. The mechanism is assembled in the reverse order.

Undermount trimmer

Before installation, the flexible shaft must be thoroughly lubricated with grease to reduce the likelihood of repeated failure of this part.

Electric mower shaft bearing

Flexible shaft rupture can only occur in electric trimmer models with an overhead motor.

Electric scythes with a bottom engine do not have a flexible shaft, but malfunctions of such devices can manifest themselves in the form of destruction of the bearing of the main shaft of the electric scythe on which the reel with fishing line is installed.

Fixing such a malfunction is very simple; just replace the failed bearing with a new part.

Conclusion

With frequent use and improper care of the electric scythe, the listed malfunctions can appear with enviable regularity. To minimize the likelihood of breakdown, it is enough not to overload the device, lubricate the rubbing parts in a timely manner and do not work under high humidity. Despite some limitations when working with this device, unlike gas trimmers, malfunctions cannot occur in the ignition unit. And such a malfunction as “the trimmer motor immediately stalls” cannot exist in principle. Engine electrical device cannot stall, because it does not need to be started. To start, just press the power button, which is why many summer residents choose electric trimmers to care for the surrounding area.

A trimmer, both electric and with an internal combustion engine (ICE), is an indispensable tool in the summer and autumn for owners of summer cottages and private houses. With its help, weeds, small bushes can be easily removed and the lawn trimmed. But, like any equipment, trimmers fail at the most inopportune moment. To troubleshoot problems with your own hands, the user of this equipment first needs to determine the cause of their occurrence.

With a lawn mower and an electric trimmer, if we do not consider breakdowns associated with the bar and the mowing head, malfunctions mostly occur in the engine area.

Gasoline trimmer breakdowns

Typical breakdowns petrol trimmer The problems that owners of this unit most often encounter are the following:

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

Malfunctions of electric trimmers

Since the design of an electric mower is much simpler than a motor trimmer, there are few reasons for its failure.

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

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

• electrical cable fault;
• control button is faulty;
• burnt out motor stator winding;
• break contact connections on the engine.

Why does the gasoline trimmer not start?

The reasons why a gasoline trimmer stopped starting may be different, so it is necessary to carry out a step-by-step diagnosis of the device.

Fuel tank (fuel quality)

Remember that before starting the unit you must always checking the availability and quality of fuel. IN in this case You shouldn’t be greedy and save money, and don’t be “clever” about the amount of oil you add. Everything must be done according to the manual supplied with the device, since if the piston group fails, replacing it will cost about 70% total cost trimmer. Fill with fuel in the expectation that you will completely use it up when performing the work. . Gasoline remaining in the tank loses its properties after some time and can harm the engine.. Therefore, do not prepare the mixture for future use or large quantities. If the lawn mower has trouble starting, try draining the “old” fuel from the tank and refilling it with a freshly prepared mixture.

Important! Filling the device with fuel, the origin of which is unknown, is fraught with danger negative consequences. Gasoline must be of high quality, purchased at a gas station, and its grade must be at least AI-95.

Candle and candle channel

So, you changed the fuel, but nothing changed, and the trimmer still won't start. In this case, it is worth checking the spark plug channel to see if it is filled with a combustible mixture. Users often translate air damper to the “OFF” position when starting, and when the engine starts, do not turn it to the “ON” position, after which it stalls. Further, an attempt to restart the internal combustion engine results in the spark plug being flooded with gasoline, and starting becomes impossible. To diagnose and fix possible problem in this node, do the following.

1. It is necessary to unscrew the spark plug, wipe it well and dry it. When installing a spark plug into an internal combustion engine cylinder, it must be dry.
2. Drain any accumulated fuel from the combustion chamber. This is done through the hole from which you unscrewed the candle.
3. If there is carbon deposits on the spark plug electrodes, it must be removed either with a thin file or a nail file.
4. Do not forget to set the gap between its electrodes before installing the part in place. The gap on the spark plug should be 1 mm. You can use a coin as a feeler gauge to check the gap.
5. Next, reassemble the unit, read the starting instructions and try to start the engine again.

If the internal combustion engine does not start, you will need to check the spark. To do this:

• unscrew the spark plug;
• put the cap of the high-voltage wire on it;
• touch the metal part of it to the cylinder body (to ensure contact, you can insert a tubular wrench) as shown in the figure below;
• Pull the starter cord until the engine turns several times.

Normally, each time the piston pumps, a spark should jump between the electrodes of the spark plug. If there is a spark, then the reason that the internal combustion engine does not start must be looked for in other components of the device.

To better understand the process of how to test a spark plug for the presence of a spark, you can use this video, where the test is shown using the Soyuz lawn mower as an example.

If there is no spark, then at the beginning check the cable connecting the spark plug to the coil - perhaps this is the reason. You can ring it using a tester. If a circuit break is detected, the high-voltage wire will need to be replaced.

Also, the reason that the spark has disappeared may be ignition coil malfunction(magneto). The figure below shows what a coil (magneto) from a Patriot gasoline trimmer looks like.

To exclude a malfunction, you will need to use a tester to check the trimmer magneto, namely, its primary and secondary windings. On the primary winding, the resistance should be in the range from 0.4 to 2.0 Ohms. If the device shows 0, this means that a short circuit has occurred in the winding, and if infinity, this means a clear sign circuit break. The resistance on the secondary winding should be in the range from 6 to 8 kOhm.

On some coils it can reach a value of 15 kOhm.

If your lawn mower does not start well or immediately stalls after starting, you should pay attention to the air filter, as it may be clogged, as a result of which air does not enter the combustion chamber and the fuel does not ignite. To check if the problem is in the filter, remove it and try to start the engine. If it works, then the reason has been found. The filter must be replaced or thoroughly washed and dried before installation. In case you find oil in air filter , it must be washed with gasoline, wrung out well and dried for at least 2 hours before reinstalling.

If the unit still does not start with the air filter removed, it is recommended to check the fuel filter.

Fuel filter

This filter cleans the fuel from possible contaminants. If it is clogged, then gasoline does not enter the cylinder, and, accordingly, the unit does not work or stalls after starting. The fuel filter is located at the end of the intake hose that is located inside the fuel tank. To get to the filter, you need to remove the plug with the tubes coming out of it.

When removing the plug, the intake hose may become detached and remain in the tank. It is removed using tweezers.

Next, remove the old fuel filter from the hose and put a new one, purchased in advance, on it. You can also clean the fuel filter, if you don't have a new one. The filter must be secured to the hose using a spring clamp.

Install the intake tube onto the plug and insert the latter into the tank.

It should be noted that in some trimmer models the intake hose is not located on the plug, but inside the tank. You can remove it using tweezers or a hook bent from wire.

Breather is check valve, which is designed to equalize the pressure in the gas tank. If it is clogged and does not allow air to pass towards the tank, then a vacuum forms inside the fuel container and fuel stops flowing into the carburetor. To check the serviceability of the valve, remove the hose that goes from the reservoir to the carburetor. If gasoline does not flow out of the tank, it means the breather is clogged.

Trimmer users often wonder: where is the breather? This valve is usually located in the gas tank cap and looks like the following picture.

Cleaning the breather is very simple: disassemble the valve and wash all its components. In some lawn mowers, this valve may be located directly on the fuel tank. It will not be possible to find it right away, since it is hidden from view under the starter housing. This breather can be cleaned using a regular needle.

The reason that the trimmer has significantly lost power, and when trying to increase engine speed, it gains them slowly, is often a clogged exhaust channel through which exhaust gases exit the combustion chamber.

It is necessary to remove the muffler so that no fumes get inside the cylinder. Next, clean the exhaust channel of carbon deposits.

This must be done very carefully, preventing carbon deposits from entering the combustion chamber.

After this procedure, the weak power of the unit and the slow increase in the speed of rotation of the mowing head will no longer frustrate you.

Insufficient compression

If the compression is insufficient, then in most cases it will not be possible to start the engine. To check the compression, you can use a car compression tester.

What compression should it be? Normally, compression should be not lower than 8 kg/cm 2. Although, even at 8 kg/cm2, some engines do not idle and stall because fuel is not pumped up sufficiently. If your lawn mower does not pump above 8 kg/cm2, you will have to check the cylinder, piston and rings.

Also, poor compression may be due to loose carburetor. Check if it is wobbly. If so, tighten the fasteners holding it in place well. Also, if the carburetor is not screwed on properly, you may notice that gasoline drips during operation.

Electric trimmer vibrates

Many users of mowers have noticed that after some time after the device starts operating, it begins to vibrate strongly. Some trimmers, mainly more expensive models, have an anti-vibration system in the form of shock absorbers located between the engine and the rod. But in some cases, even this cannot save you from strong vibration. The reason that strong vibration appears in the trimmer may be a small amount or complete absence of lubricant on the hard or flexible shaft, located inside the apparatus boom.

Replacement hard shaft lubrication happens as follows:

• unscrew the gearbox located at the bottom of the rod;

• after removing the gearbox, you will see the end of the shaft, which you need to pull to remove the part;

• after removing the shaft, it must be generously lubricated with special grease “Shrus-4” or regular grease “Litol-24”;

• Apply a small amount of lubricant to the shaft and spread it evenly along the entire length of the part, including the splines at the ends of the rod (if they are worn out, the shaft will have to be replaced);
• After lubrication, insert the shaft back into the rod and put the gearbox in its original place.

Flexible shaft lubrication is done as follows:

• unscrew and remove the mowing head;
• remove the rod from the electric motor by unscrewing a couple of bolts;
• pull out flexible cable from a rod;
• Lubricate the cable along its entire length.

This is done like this: first you need to lubricate the end of the cable, and then insert it into the rod, after which, as it moves inside the pipe, you should apply lubricant to the part and distribute it evenly over the surface. Then insert the flexible shaft rod into the electric motor and secure it.

If lubrication does not help and vibration continues to appear, you will need to change the flexible shaft.

The trimmer gets very hot

Overheating of the trimmer can occur for many reasons:

• gasoline does not have the same octane number as indicated in the instructions for the unit;
• the proportions of gasoline and oil were not observed during preparation of the fuel mixture;
• the mixture of fuel and oil was prepared a long time ago (the mixture cannot be stored for more than 2 weeks);
• the trimmer operates beyond the time specified according to the instructions;
• a low-power trimmer is used on thick and hard grass, the device works with overload and heats up quickly;
• has moved towards the rod or the cassette cover has become stuck.

The latter happens if you set unsuitable mowing head for the machine, or when the axis moves inside the rod. These changes make it harder to rotate, the load on the engine increases, and it overheats.

Buyers' Choice 2018

Trimmer ECHO SRM-2305SI

In order to quickly cut the grass on the lawn, you need to use a lawn mower. But in order for the site to look beautiful and neat, you need to use a lawn mower. Using a fishing line or a cutter, which is used on a brush cutter as a cutting device, you can evenly cut the grass to any height. Moreover, the technique allows you to trim small branches of trees and bushes. Where a regular lawn mower is unable to cope with the work, a walk-behind mower helps a lot. Uneven areas, large grass, tough bushes - a lawn mower can handle it all.

Modern brush cutters produced by global brands are distinguished by high functional characteristics. Having a lawn mower for the home and for public utilities is a necessity today. For example, to cut grass for hay, you need to have a brush cutter.

Gasoline-powered scythes are used for street work, for , for mowing the grass. Even if a lot of tall grass and small shrubs have accumulated on the site for a long time, you can fight them using a lawn mower, which will create a neat appearance for the site. Very often, lawn mowers are used for non-standard work. For example, railroad workers often use this technique to remove grass that grows between sleepers.

Almost always a scythe becomes an assistant where another is powerless. But it also happens when a lawn mower, bought for a lot of money, just lies idle in the garage. For example, a person does not know how to use equipment correctly or how to start it. However, most often when malfunction with a gasoline scythe, the engine, blades and other parts fail.

In order to avoid such situations, our specialists will tell you how to properly operate the lawn mower. In general, equipment requires constant care and careful use.

Petrol mower device

The starter is manual, the engine is cooled by air.

Most often, brush cutters have two-stroke engines, but modern expensive models have four-stroke power devices. A two-stroke engine is simpler in design, but it produces a lot of noise and a lot of burning, since the oil burns in the same chamber along with the fuel - gasoline.

A four-stroke engine produces more revolutions. When working with a lawn mower, you immediately feel the power and efficiency of the work. Vibrations are very weak and emissions are few. Such an engine is rightfully considered reliable; its service life is much higher than that of a two-stroke engine.

Two-stroke engines operate for a limited time. The instructions indicate how long you can work with the brush cutter before it needs time to cool the engine. As cutting material a fishing line or a metal knife is used.

In order for the mower to operate efficiently and long-lasting, so that the equipment does not require frequent repairs, you must follow the rules for using it. Violations of the prescribed rules are not allowed. Important regular care behind the unit.

Even if you have never held a lawn mower in your hands, you will still not have any difficulties using it. Home work consists of rotating the lawn mower from side to side when cutting the grass.

In general, there are several types of grass cutting. For example, you can rotate the device from left to right while moving forward. There is a so-called square system, when a person with a lawn mower walks around a square. You can use it in any way, the main thing is not to violate the rules stated in the instructions.

When mowing, do not press the line against an area that has already been mowed. If you neglect this rule, the motor will be overloaded and the head will fail. In order to mow tall grass, you need to use a fishing line. The string is kept parallel to the ground.

Of course, you should worry about the safety of your equipment. However, you should worry about your safety most of all. Before working with a lawn mower, you need to wear safety glasses, headphones, and a special suit that covers exposed parts of the body. Be sure to have tight shoes.

If stones and other debris are visible on the site, it must be removed. There should be no people near the work being carried out within a radius of fifteen meters.

Without gasoline as fuel, the lawn mower will not work, so it is recommended to use the fuel in the proportions specified by the equipment manufacturer. The mixture is considered correct when oil and gasoline are used for two-stroke engines. Motorcycle oil is not used in brush cutters, as there are no guarantees. quality work no engine. Only the highest quality gasoline is used for lawn mowers. IN proper storage High octane gasoline is also needed. Such fuel can be stored in metal containers for no more than one month. Otherwise, the quality of the fuel disappears, and oxidation of the container begins.

Before using a gasoline scythe under heavy loads, you need to run-in the engine. So you can increase performance motor. The fact is that during break-in, the engine elements rub against each other. During the test run you can easily learn how to operate the device. When using a gasoline brush cutter for the first time, you must follow the following rules:

• Do not let the engine run at maximum power for a long time;
• You need to constantly monitor the engine temperature;
• The lawn mower cannot be used until the engine is warmed up;
• after break-in, change the oil;
• it is forbidden to overload the engine;
• It is constantly necessary to clean the fuel filter, as well as the engine grille;
• Every ten hours of engine operation you need to clean the air filter;
• the tip on the tube is lubricated every twenty hours;
• It is forbidden to work with a dull knife.

Thus, you can use the brushcutter during break-in in gentle modes. This will extend the life of your scythe.

You can do it at home service brush cutters. So, the main element is the engine. The main problem that occurs most often with brush cutters is a violation of engine compression. It happens that the engine jams, and the carburetor also becomes unusable. Therefore, you need to clean the air filter all the time.

Cutting elements should always be well sharpened. A file is used to sharpen a knife. It is important to observe the angles of the cutting surfaces when sharpening. Disc wear should be even. If the disc is dull, then the grass is not cut well, and this affects the operation of the engine.
On gas trimmers, fishing line is used as a cutting object. Do not use wire or cable. The fishing line must be made of durable nylon. The diameter of the fishing line should always be as specified by the manufacturer.

The head on a brush cutter always needs cleaning and lubrication. Used on lawn mowers bevel gear. For normal operation of the equipment, it also needs to be cleaned regularly. In order for equipment to last a long time, it must always have a protective cover. Not only that, it ensures your safety.

Repairing a lawn mower yourself is not the best thing that can happen. It happens that after the equipment is disassembled, it is not possible to reassemble it.

During work, there are breakdowns that you can quickly fix yourself. For example, if the power switch fails, then it needs to be changed. Where electrical equipment is sold, you can always find a toggle switch for a brush cutter. Often the head stop will fall off. You can always attach it to a barbell. Copper wire is used for this.

When a fishing line breaks, you can always buy a new one. You can use regular nylon or nylon fishing line until you buy the original fishing line. The line is wound onto the drum by hand.

Even if the rod is broken, it can be repaired. Strong vibration of the device indicates that the engine lacks lubrication. Disassembling the casing and filling in new oil will not be a problem.

If the engine often stops working, you can try closing the throttle, which will lead to a richer fuel mixture. It could also be that the problem lies with the spark plugs.