Why does the electric trimmer not work. Do-it-yourself electric trimmer repair

How repair electronic trimmer Experts of the service center will be able to assess the breakdown and future repairs. Repair of electronic trimmers To keep the lawn in

How to repair electric trimmer

The specialists of the service center will be able to assess the breakdown and future repairs.

Repair of electric trimmers

To keep the lawn in proper condition, it is comfortable to use a trimmer. There are petrol trimmers (their engine runs on gasoline) and electronic (powered by the mains). All types of trimmers have malfunctions. Do not repair electronic trimmers without the help of others, you must contact a service center where you can repair trimmer.

You should immediately warn that repairing an electric trimmer, like other equipment, is not cheap, especially if you need to repair the trimmer engine or replace the coil. In some cases, it's actually easier to buy a new tool. This can be assessed by a competent specialist who knows how to repair trimmer.

How to repair an electric scythe yourself/Trimmer repair from AVTO CLASS

How to repair do-it-yourself electric scythe / Trimmer repair/ do-it-yourself electric scythes. Affiliate.

THERE WAS NO LIMIT TO SURPRISE, do-it-yourself repair of an electric lawn mower trimmer

disassemble electrical mower and looking for a fault.

Repairing electric trimmers won't be a hassle if you know where to get your trimmer repaired. Neither Internet forums nor acquaintances will solve the question of how to repair the trimmer, only professionals will help. If there are no spare parts for a specific model, they will be able to pick up similar ones.

Electrical faults

To identify malfunctions of the electrical part, as a rule, inspection alone is not enough; you need a multimeter or at least a tester with a continuity.
Such malfunctions are characterized, as a rule, by the complete inoperability of the engine, severe overheating or jerky operation.

The test begins with the power cable; if it is damaged, it is either repaired or replaced.
Express check involves checking the voltage of 220 volts at the engine contacts.

Voltage should appear when the button is pressed, if voltage is present, then we can safely say that the trimmer motor is faulty, it must be disconnected and carefully inspected.
Slight contamination of the collector plates and brushes is normal, but it is still better to clean with a soft cloth moistened with alcohol, if worn brushes are clearly worn, it is better to replace them.

Using a multimeter in the resistance test mode (the smallest limit is Ohms), we touch the brush contacts or the graphite brushes themselves with the probes, the tester should show a resistance of no more than 100 Ohms.

If the resistance is infinite (one on the multimeter), then try turning the motor shaft without removing the probes.
In a serviceable electric motor, the resistance wakes up about 10 - 40 Ohms, if the brushes do not ring, then there is no contact or the integrity of the stator windings is broken, a break or burnout is possible.
If the resistance is less than 5 ohms, there is an interspecies short circuit, most likely caused by severe overheating of the engine.

To identify a specific reasonwhen the motor brushes do not ring, you can resort to the following procedure.
Graphite brushes must be pulled out by first sticking out the brass inserts or removing the pressure springs.

The collector motors in these devices are so arranged that the stator and rotor windings are connected in series, and in expensive models of electric motors, a thermal relay (110 degrees) is also connected to this serial circuit, such a relay keeps the power contact closed under normal conditions.
A separate diagnostic method can be checking the resistance on the plates of the collector drum.

In order to identify the culprit of the malfunction, it is necessary to remove the insulation in the form of cambric from the fluoroplastic where the windings and the thermal relay are connected and ring each winding separately with a multimeter, as well as the thermal relay itself.

Mechanical failures

In electric scythes, the most loaded mechanical elements can be called bearings and a trimmer coil (spool).
In most cases, the device stops cutting grass due to the failure of its line spool

The line is over. According to the instructions provided, wind the fishing line on the reel.

The line got tangled. If the reel is not damaged, then you need to cut or unwind the fishing line and, if necessary, rewind the entire spool.

The line slipped. Due to the rather intense work and high overheating, the plastic threads of the fishing line can fuse with each other. It is necessary to rewind the spool with new fishing line and inspect the damage to the spool itself.

The motor runs but the line spool does not rotate. Most likely there was damage to the structure of the reel with fishing line. The attachment points of the bottom of the coil can break off, you need to completely disassemble the bobbin and, if necessary, modify the attachment or completely replace it. In most electric trimmers, the bobbin is simply pressed with its plastic case onto the motor shaft, and in case of severe overheating, when the plastic melts, it can turn and fly off completely.

Repair trimmer Bosch Art 23 combitrim and electric scythes GARDENER GT - 550

Both devices did not show any signs of life, the engines did not work when turned on.

The case of both devices consists of two halves, the screws are on one side, which is convenient for disassembly.
After all the screws are unscrewed, the upper case is separated from the lower one by gently pressing a flat screwdriver into the slot to open the interlocked plastic locks.

After disassembly, we proceed to inspect the insides and troubleshoot.

During the inspection, it was found on the engine Bosch trimmer, on one of the brushes, which is fixed by a clamping spring, a copper conductive wire fell off, which naturally was the reason for the lack of voltage on the brushes and the engine did not rotate.

The wire was restored to its place, and along the way, the collector pads were cleaned, with a soft rag soaked in alcohol, to a copper sheen. The brushes were in good condition and did not need to be replaced.

It was also found that the switch does not create a reliable electrical contact, it was necessary to forcefully clamp the button, it was decided to disassemble the button, its contacts were cleaned from soot and lubricated with KONTAKT S-61 current-protective spray.

FROM electric scythe GARDENER it was not so simple, she lay for quite a long time in a broken state, and in the literal sense of the word "broken", her rod at the place where the engine housing was attached was broken in half, apparently her operating conditions were so difficult.

With the help of perforated plates from metal profile mounts, a new fastening of the engine housing to the electric scythe bar was not cunningly made. The integrity of the structure has been restored, albeit not in an aesthetic but reliable way, because the main thing in an electric scythe is its functionality.

The motor shaft was noticeably hard to scroll, an internal inspection revealed burnt collector plates and worn brushes. The plates were sanded to a shine, and the brushes were replaced with new ones.

In view of the long operation without lubrication and subsequent storage of the device in an aggressive environment, the bearings stuck a little and the motor shaft rotated unnaturally with difficulty.
Engine bearings were washed with WD-40 spray followed by lubrication. As a result, the engine began to rotate noticeably better, but still the bearings were already “broken” and when the engine was running from the mains, the sound of its operation was not so smooth and monotonous.

Further inspection of the electrical part led to the button, it was completely broken from its fasteners, although it was pressed, but the tester showed its malfunction. The button is not collapsible so it was replaced with a new one. Fasteners had to be restored with hot glue.

In addition to the broken rod, there was a crack in the plastic protection, apparently someone did not drop it weakly. The scythe could work with her, but it was decided, as far as possible, to restore the protection structure.

Naturally, simply gluing such a loaded and impact-prone object with glue would not be a reliable solution. Therefore, with the help of the same perforated plates from the metal profile, two brackets were made that created a "monolithic" connection of the two parts of the cracked body.
The plates were connected to the body with aluminum rivets.

When the lawn mower was assembled, it was found that the rod at the attachment points of the handle was poorly fixed and rotated, so the places where the plastic protrusions of the handle body were pressed against the metal of the rod were additionally sealed with a strip of rag tape. Now the design has no extra backlash.

The main most common malfunctions of electric braids and trimmers

Doesn't mow grass

The reel (spool) has run out of line. In most spools, the mesh feed is semi-automatic, with a light hit of the spring-loaded button on the ground, the fishing line is fed to the exit. If the line is not fed, then you need to remove and disassemble the spool - spool and, if necessary, wind a new line.

The fishing line may be too long due to the fact that the blade, which is recognized for cutting the excess along the length of the fishing line, is blunt or does not exist at all.
The length of the fishing line should be slightly less than the diameter of the protection.

Vibration during operation

A large rumble and vibration during engine operation may indicate that the bearings need lubrication or they have completely used up their resource.
The body of the reel with fishing line (spool) may also be cracked, it, as well as the place of its attachment, must be inspected for cracks and damage.

Speed reduction

Most electric motors in braids and trimmers are collector and do not have a speed controller, with a decrease in mains voltage, speed and power decrease.
The spool of line may not be wound correctly.
Perhaps the speed is hampered by the presence of a stuck twig or a rope is wound around the shaft, the structure should be inspected. In a working braid, the shaft should turn easily and without the slightest effort even after it has been dispersed with a finger.

Electricity not working

Engine not turning? We look at the presence of power on the electric plug, if everything is in order, then the device needs to be disassembled.
If no obvious damage is noticeable, then a serial continuity of the electrical circuits of the device begins.

Using a multimeter (tester), they first ring the power cord, the fuse if there is one, and the button.
If the button does not ring in the on state, then it should be replaced or if it is collapsible, then open and clean the burnt contacts.

The cord may be broken, in which case the engine may start intermittently.
An engine malfunction may be the fact that when the button is on, there is a voltage of 220 volts on the engine contacts, but it does not rotate.

Some electric motors are equipped with a thermal fuse that is built into the motor housing and has been triggered by overheating or simply failed. A good thermal fuse should restore its operation when the engine cools down.

Trimmers are simple grass cutting devices that have replaced ordinary scythes. This type of household appliances is powered by an internal combustion engine or electricity. During operation, some parts may fail in the unit. Repair of trimmers is carried out independently. In case of complex breakdowns, they order diagnostics and troubleshooting in the service center.

Faults and their elimination

Electric and gasoline trimmers experience typical breakdowns and malfunctions. For devices powered by an internal combustion engine, these are:

problems in the carburetor;
engine breakdown;
problems with the fuel system;
breakdown of the gearbox, starter, muffler;
blockages;
air filter failure;
problems with the ignition coil.

Electrical units have specific breakdowns:

problems with the control button and electric cable;
burnt motor stator winding;
breaking contacts.

With simple problems, you can do the repair of the trimmer with your own hands.

Why won't the trimmer start?

The most common reason that the unit does not start is the use of low-quality fuel. The choice of brands of gasoline below AI-92 can disable the lawn mower. If high-quality fuel is used, other reasons must be looked for. To do this, carefully check all nodes and systems. Subject to verification:

spark plug and candle channel;
air and fuel filter;
breather;
outlet channel.

The device may not start after a long period of inactivity. Before turning on the trimmer, you need to study the instruction manual well. The solution to many problems is indicated in it.

If it stalls when you press the gas

There are several reasons why the trimmer stalls when you press the gas:

The first reason is the misalignment of the carburetor.
Fuel valve blockage.
Check valve clogged.
Loose and slack carburetor cable or slack fuel pickup hose.

In order to avoid the described problems with the lawn mower, you need to carefully monitor the condition of the device and its blocks. Timely cleaning, washing of the unit and spare parts can increase its life.

See » How to make a boat motor from a garden trimmer with your own hands

Starter failure

The most difficult starter failure occurs when the rope breaks and winds it around the flywheel of a running engine. As a result, the spring may burst and the pulley may break. In this case, only a complete replacement of the part will help. Such a breakdown rarely occurs. More often happens:

breakage of the rope of the shmorgalka;
spring breakage;
spring engagement failure.

In this case, it is easy to repair the starter yourself. The manufacturer has prepared step-by-step instructions for this.

Gearbox repair

Caring for the lawn mowing gearbox consists in the timely lubrication of the unit. Lack of this can lead to rapid wear of the gears and jamming of the gear module.

The main malfunctions of the trimmer gearbox:

strong heating of the transmission unit due to the use of poor quality lubricant or its absence;
jamming of the shaft during the rotation of worn bearings;
staggering or flying off the rod of the transmission mechanism as a result of damage to the housing;
lack of rotation of the output shaft with a knife due to wear of the teeth on the gears.

Most of the problems in the gearbox are due to the destruction of the bearings.

This happens due to the use of poor quality lubricant or its complete absence. Another reason for the failure of the gearbox is the operation of the trimmer at the limit of its capabilities and the ingress of foreign objects. To replace a defective bearing, the gearbox is disassembled.

Features of the repair of electrical models

Electric models of trimmers powered by a network are composed of several main blocks:

the mechanical part that provides the transmission of torque to the trimmer head;
Electrical engine;
power cable.

Each electric trimmer unit has specific problems. In the mechanical part, they depend on the presence of a fishing line used as a cutting element. Reasons for stopping work:

tangling of the fishing line;
sticking of the nylon thread due to overheating of the trimmer;
problems with the drive shaft and coil.

You can identify problems with the electrical part of the electric scythe using special tools:

indicator screwdriver;
multimeter;
set of keys and screwdrivers.

To fix problems, you need a blowtorch.

Electrical damage:

power cable failure;
problems with the socket and plug;
failure of the control knob;
combustion of the starter winding, an engine replacement is required;
breakage of contacts can be corrected independently with a blowtorch.

How to adjust a carburetor

The module is adjusted by the manufacturer. During the operation of the device, after repair or cleaning of the module, it becomes necessary to adjust the carburetor.

Carburetor tuning does not require replacement parts. Debugging is done using 3 screws that are in the design:

L - controls the fuel supply at low speeds;
H - controls fuel consumption and temperature, and is also responsible for the supply of gasoline at high speeds;
T - is responsible for idling the engine.

The trimmer carburetor is adjusted after the engine has warmed up. For this, 10 minutes of idle operation of the device is enough. Rotating the mowing head at idle allows you to proceed directly to the debugging of the screw T. It is turned counterclockwise until the rotation stops. Then scroll the screw H to the right and left to find the position at which the idle speed will be maximum. The screw is turned ¼ full turn counterclockwise from the found point, this will be the working position.

Screw L is adjusted using the same method. After repairing the carburetor, the module must be adjusted so that the device works correctly.

How to disassemble and assemble the trimmer

For self-disassembly of the trimmer, a set of tools is prepared:

a set of screwdrivers and wrenches;
special puller for removing bearings;
candle key;
hammer.

Disassemble each node of the device separately for diagnostics.

trimmer motor

A grass trimmer is a very necessary thing in the household of every summer resident. Caring for the site turns into a not particularly burdensome exercise, but as long as the trimmer is in good working order. So, let's see what breaks in the trimmer and whether it can be fixed.

If you have been working and the trimmer has stopped responding to the power button, then, as usual, first check the plug to see if it has popped out of the extension cord socket. This often happens and is not a breakdown.

If the operating mode is violated, especially on cheap trimmers, where the engine is mounted directly on the plastic of the case, when heated, this same plastic can begin to melt in the area where the rotor bearings are attached.
Constant vibration can cause a situation where the contact terminals come off.
If the trimmer head is wedged, then along with a mechanical failure, the winding may also burn out due to an instant increase in current.
If moisture gets inside the motor, an inter-turn short circuit of the motor is quite likely.
In cheap trimmers, the brushes of the electric motor can be mounted directly into the plastic of the body. When overheated, the plastic begins to “flow”, the contact between the brush and the motor rotor deteriorates and the heating increases. Next, the brush changes its position and the rotor cuts it off or pulls it out of its seat.
If the engine is running and the line is not spinning, then the motor rotor connector and the flexible shaft of the head may break.
The switch also breaks, or the trigger lever, which transmits pressure from the finger to the switch.
A break in one or two cable cores occurs at the bend, at the outlet of the network cable from the trimmer body.

We remind you that the work must be carried out by a qualified master.

Tablet or smartphone charging stopped working
What to do if the electric stove stops working

A benzokosa is one of the main tools of a summer resident used to quickly bring the land in order. This tool is purchased for mowing grass in the backyard and the owners of private houses. The period of active use of lawn mowers and electric trimmers falls on the summer period. Before starting operation, the tool is put into working condition: rubbing parts are lubricated, the cutting set is changed, the fuel mixture is poured into the tank. If the engine does not start at all or stalls quickly, without gaining a sufficient number of revolutions, then you have to look for the causes of the malfunctions and eliminate the identified malfunctions. To carry out repairs of lawn mowers with your own hands, you need to understand its structure and the principle of operation of the main components. This information can be found in the operating instructions, which the manufacturer applies to garden equipment without fail. Check for such a manual when buying a chainsaw. An imported tool must be accompanied by an instruction written in Russian.

A long tubular rod is attached to the gearbox of a two-stroke internal combustion engine. A shaft passes inside the bar, transmitting torque from the gasoline engine to the cutting mechanism. The fishing line or knives rotate at a frequency of 10,000 to 13,000 rpm. In the protective housing of the gearbox, there are holes into which grease is injected using a syringe. For ease of use of the tool, the manufacturer equips it with a special adjustable shoulder strap.

The cutting set is attached to the lawn mowers:

The fishing line, the thickness of which varies from 1.6 to 3 mm, is located in the trimmer head. When mowing grass, the line is subject to wear. Changing the line is quick and easy in two ways: by winding line of the same diameter onto a bobbin or by installing a new spool with already wound line.
Steel knives with double-sided sharpening for a lawn mower for cleaning the area from weeds, small shrubs, hard grass. Knives differ in shape, as well as the number of cutting surfaces.

On the U-shaped, D-shaped or T-shaped handle attached to the bar, there are control levers for the brushcutter. The cutting mechanism is protected by a special casing. Household lawn mowers are refueled with a mixture prepared from gasoline and oil, which is poured into the fuel tank. The device of semi-professional and household lawn mowers equipped with a four-fold gasoline engine is slightly different. The refueling scheme is also different: oil is poured into the crankcase, and gasoline is poured into the tank.

The measured piece of fishing line is folded so that one end is 15 cm longer than the second. We put the loop into the slot on the reel and start winding it in the direction indicated by the arrow

What to do if the engine does not start?

If it is not possible to start a lawn mower, then the first thing to do is to check the presence of fuel in the tank and its quality. To refuel the tool, it is recommended to use high-quality gasoline purchased at gas stations, the brand of which must be at least AI-92. Saving on cheap fuel can lead to a breakdown of the cylinder-piston group, the repair of which can take a third of the cost of the lawn mower itself. Equally important and correctly prepare the fuel mixture of gasoline and oil. The proportional ratio of these components of the mixture is indicated by the manufacturer in the manual. Do not prepare the fuel mixture in large volumes, as long-term storage loses its properties. It is better to use a freshly prepared mixture.

When preparing the fuel mixture, pour the oil into gasoline using a medical syringe, which allows you to accurately maintain the required proportion of components

A clogged fuel filter in the tank can also interfere with the engine of the lawn mower. Therefore, if you have problems starting the engine, check the condition of the filter. Replace the filter if necessary. It is forbidden to leave the inlet pipe without a fuel filter.

The air filter also needs to be checked. When contaminated, the part is removed, washed in gasoline in the field and put in place. In the country or at home, the filter can be washed in water using detergents. After that, the filter is rinsed, wrung out and dried. The dried filter is moistened with a small amount of oil used to prepare the fuel mixture. Excess oil is removed by squeezing the filter with your hands. The part is then put into place. The removed cover is put back and fixed with screws.

The air filter, washed in the fuel mixture, wrung out and dried, is put in place in a plastic case and closed with a lid

How this procedure is done in more detail you can see on the video:

If all of the above procedures are carried out, and the engine does not start, then adjust its idle speed by tightening the carburetor screw. In the video posted at the beginning of the article, attention is paid to this issue.

So, in order:

Lay the tool on its side so that the air filter is at the top. With this arrangement of the chainsaw, the fuel mixture is ensured exactly at the bottom of the carburetor. On the first try, the engine will start if you remove the air filter before starting and pour a few drops of the mixture into the carburetor, then reinstall the dismantled parts. The method has been tested in practice.
If the first tip does not work, then most likely the problem is in the spark plug. In this case, unscrew the spark plug and check its performance, and also dry the combustion chamber. Replace the spark plug that shows no signs of life with a new one.
If the spark plug is in good condition, the filters are clean and the fuel mixture is fresh, then you can use the universal way to start the engine. Close the carburetor choke and pull the starter handle once. Then open the throttle and pull the starter 2-3 more times. Repeat the procedure three to five times. The engine will definitely start.

Some pull the handle with such force that they have to repair the starter of the lawn mower with their own hands. This is only possible if the cable breaks or the cable handle breaks. In other cases, it is recommended to replace the starter. This unit is sold as a set.

How to replace the spark plug correctly?

The order of work is as follows:

Stop the engine and wait until it cools down.
Disconnect the high voltage wire from the spark plug.
Unscrew the part using a special key.
Inspect the spark plug for replacement. The part is replaced if it is faulty, heavily soiled, has a crack on the body.
Check the gap between the electrodes. Its value should be 0.6 mm.
Tighten the new spark plug inserted into the engine with a wrench.
Spend installation of a high-voltage wire on the central electrode of a candle.

As you can see, there is nothing super complicated in this procedure.

A new spark plug for a two-stroke internal combustion engine of a gasoline scythe is installed to replace the old part that failed

Why does the lawn mower stall after starting?

After starting, the engine may stall if the carburetor is incorrectly adjusted or misaligned. By what signs can one understand that the reason really lies in this? Very simply, by the vibrations that will be clearly felt during the operation of the lawnmower. You can adjust the fuel supply with your own hands by doing everything that is written in the instruction manual for the tool.

The engine may stall due to a clogged fuel valve. The cause is eliminated by cleaning it. If the lawn mower starts up, and then abruptly stalls, it means that the fuel supply to the carburetor is difficult. Loosen the carburetor valves to ensure that fuel flows freely to it in the right amount.

Too much air can also stall the engine. Increase the engine speed so that air bubbles exit the unit's fuel system more quickly. Also be sure to check the integrity of the fuel intake hose. If mechanical damage is found (cracks, punctures, etc.), replace the part.

How to clean and store the instrument?

During the operation of the lawn mower, monitor the condition of the engine cooling system. The channels in the starter housing, as well as the cylinder ribs, must always be kept clean. If you ignore this requirement and continue to operate the lawn mower, you can disable the engine due to overheating.

Proper care of a gasoline scythe during operation allows you to use it for several seasons in a row without major repairs.

Allow the engine to cool before cleaning. Take a soft-bristled brush and clean the outer surface of the dirt. Cleaning of plastic parts is carried out with solvents, including kerosene, or special detergents.

At the end of the summer season, the lawn mower should be prepared for long-term storage. To do this, the fuel mixture is drained from the tank. Then the engine is started in order to develop the remaining fuel in the carburetor. The entire tool is well cleaned of dirt and sent to "hibernation".

As you can see, it is quite possible to repair malfunctions of household lawn mowers on your own. Service should be contacted in case of serious breakdowns. In this case, the cost of repairs should be correlated with the price of a new lawn mower. It might be better to buy a new instrument.