DIY Elmos trimmer repair

In detail: do-it-yourself Elmos trimmer repair from a real master for the site my.housecope.com.

A petrol cutter (trimmer, brushcutter or petrol mower) is an 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. Killing weeds or trimming your lawn can all be done with ease with the trimmer. And much faster than if you use other methods.

Unfortunately, like any other technical device, the brushcutter sometimes breaks down. For example, the engine is not running or there are problems with the carburetor or starter, even if you periodically carry out maintenance of 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 brushcutter device and carry out the repair yourself.

Typical circuit, according to which manufacturers make their brushcutters:

The upper part is considered the main one - the main elements of the brushcutter are concentrated here: the starter, the carburetor and the engine;
The middle part is a rod, which is hollow inside and along which a cable is laid, connected at one end to the engine, and at the other end to a gearbox that drives the cutting line. Buttons are also located here, with the help of which the operator can control the petrol cutter. A belt is attached here to relieve the weight of the trimmer, which the operator puts on the body to make it easier for him to do his job;
The lower part consists of a gearbox and a cutting tool, covered with a special casing. This is done specifically so that the operator is not injured by debris, glass and other dangerous objects that may be in the grass that have flown into him.

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

the engine does not work, the trimmer will not start;
the engine manages to start, after which it does not hold speed and stalls abruptly and for no reason;
the brushcutter bar vibrates strongly;
the gearbox is overheating;
low speed at the cutting line.

Video (click to play).

Before proceeding with the repair, study the instructions, which must be included in the kit so that correctly diagnose.

If the engine of the device does not start, you need to check for the presence of gasoline in the tank of the petrol cutter. Keep in mind that when you refuel your device with a specially prepared mixture of oil and gasoline, the fuel must be at least AI-92. A certain amount of oil is added to the pre-calculated volume of gasoline using a syringe to avoid engine damage. After making sure that the problem is not in the absence of gasoline, we proceed to check the operation 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 in order with the candle, you will see a spark flashing between the body of the brushcutter and the candle.

Another source of trouble is that a mixture of oil and gasoline floods the channel into which the plug is screwed. Try drying the canal and drying and cleaning the candle 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 candles, you are unlikely to fix this kind of malfunction yourself, so you will need to contact a qualified specialist.

If you determine that the source of the problem does not lie with 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 starting the engine;
if the fuel mixture begins to flow out of the filter hole, then everything is in order with it; otherwise, replace the filter.

The last reason the engine won't start could be a clogged breather or muffler. You should make sure they are clean. If not, clean the exhaust port or breather.

A carburetor is a rather complex element of a brushcutter that should not be repaired by an unprepared person on his own, with the exception of performing some simple operations, for example, cleaning the inner surface of the product from contamination 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 adjustment without disrupting its normal performance.

The role of the reducer in the trimmer is to mediate between the motor and the line, transferring torque from the motor to the bottom of the machine through two toothed gears.

To prevent gear wear in the gearbox and their premature failure, care must be taken to ensure that they are constantly lubricated. Most manufacturers indicate in the instructions supplied with the brushcutters that the gearbox must be filled with oil at least once a season. If you often and extensively work with the trimmer or hear unpleasant noises coming from the gearbox, check its condition and, accordingly, you will have to lubricate it more often.

To lubricate the gearbox, you need to do the following actions:

Find a plug on the gearbox, the role of which is reduced to the fact that it closes the technical hole used to put a new lubricant;
Remove this plug using the special wrench supplied with the trimmer;
Use lubricants such as Litol-24, Oleo-Mas or ordinary machine oil. Apply them to the gears through the hole in the gearbox. In the process of performing the operation, slowly turn the gears to achieve uniform lubrication;
Tighten the plug on the gearbox and start the motor. Make sure that the extraneous noises previously heard from the gearbox have stopped.

If you hear from the gearbox hard knockingmost likely, the reason for this is that the bearings have worn out due to intensive operation, insufficient lubrication, or due to dirt entering them. There is only one solution in this situation - to replace the failed units.

If you find that the trimmer head has stopped working and is not rotating, the most likely cause of the problem is wear of gears, more precisely, their teethwhich are no longer in contact with 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.

Very often, complaints from owners of gasoline trimmers are associated with various kinds of carburetor malfunctions. Of course, in this case, it is best to seek help from specialists in this field, for whom the repair of carburetors of gasoline trimmers is an integral part of the profession.However, if you are still familiar with the basic principles of the trimmer carburetor, you can try to figure out the problem yourself, so as not to overpay money in the service, since sometimes the breakdown can be really frivolous. Image - DIY Elmos trimmer repair

This article is just intended to help you deal with the problem.

Next, we will analyze the most common breakdowns and the reasons for their occurrence.

The first step is to generally inspect the carburetor and find out if there is any fuel leakage.

If it turns out that there are no problems with fuel, it is necessary to remove the carburetor from the engine and check the condition of the gasket located next to the carburetor.

If no malfunctions are observed here, you can try to check the carburetor for tightness.

To do this, you can purchase a special device, which is part of the tool kits for repairing the carburetor repair of mowers and representing a special pressure gauge that, in fact, checks the tightness.

If you don't want to spend money on its purchase, you can use a conventional medical tonometer, on which you just need to change the pressure gauge.

When using this device, pay attention to the indication.

If the pressure does not drop and remains the same for a long time, you can rest assured, as this indicates the tightness of the carburetor.

If the pressure begins to decrease after a certain time, then there are still problems.

They can be associated with damage to any parts of the carburetor.

Before running to the nearest repair shop or specialty store selling trimers and spare parts, try to figure out the problem yourself. Sorry for the banality, but the brushcutter carburetor is not a spaceship of an extraterrestrial civilization, and it is quite possible to repair it with your own hands. To be confident in your actions, read the step-by-step instructions provided in this article.

A visual inspection of the carburetor will help detect fuel leakage and air leakage, but the main reasons for the failure of the device lie inside. Therefore, in order to determine and most importantly fix the breakdown, the carburetor must be disassembled.It does not take much effort to disassemble the carburetor of the brushcutter.It is enough to unscrew four screws on one sideand two on the other. This can be done using a conventional Phillips screwdriver. Unscrew the screws carefully and fold them to the side. They may be needed during assembly. It is advisable to cover the table with a white cloth before disassembling so that you can see everything, even the smallest details that may fall out during disassembly.We start disassembling from the side of the fuel supply system.We remove the primer - a pumping bubble, which is remarkable, it is simply impossible to install the carburetor parts incorrectly during assembly. Products have characteristic ebb and flow.Now we remove the membrane. It is she who performs the function of pumping fuel into the carburetor.When the membrane vibrates, the other side exerts pressure on the rocker of the mechanism and the needle rises, which, in turn, opens the hole and fuel is supplied.Remove the carburetor cover with the injection mechanism.Further, another membrane is installed. We carefully remove it.There is another gasket under the membrane. We also carefully remove it, without damaging it in any way.Next, we move on to dismantling the parts from the back of the carburetor. As mentioned earlier, we unscrew the two bolts. This is already an air supply system.A valve is located here, which, when gas is added, opens and increases the flow of air into the engine.After removing it, a bare body remains in the hands. The carburetor is disassembled.Identification of faults and their eliminationNow it is worth paying attention to the problems that occur during the operation of the carburetor and how to fix them.The first thing that happens is that the holes and jets in the fuel supply system are clogged with dirt. Filters installed in the tank and directly in the carburetor do not help. They still allow small particles to pass through, which cause brushcutter failure.Now we need to get the needle.To do this, unscrew the bolt on the mechanism, holding it with your finger. The fact is, there is a spring there and a careless action will lead to the fact that it is lost.We take out the needle, see photo and spring.How to purge. The most effective way is to use an ultrasonic bath.It is filled with either a special liquid or gasoline, a carburetor is placed there and under the action of ultrasound, the so-called cavitation effect, the channels are cleaned of contamination.The second option for cleaning is compressed air.You can use the compressor available on the farm and clean the carburetor channels. However, this method is effective if the contamination is not very large.If there is neither an ultrasonic bath nor a compressor at hand, then cleaning can be done in the third way using a special cylinder for cleaning the carburetor. They are sold in almost all car dealerships and supermarkets. The price is not high and is about $ 2-3. Enough of such a cylinder for 4 or 5 purges.Now we need to blow through the channels in the body and carburetor cover. See photo.Another particle of dirt can get stuck under the needle. See photo. This will also lead to brushcutter failure.

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Important! When cleaning the carburetor, never use needles, pins or wires. Even the slightest scratch will damage the carburetor. It will have to be changed entirely.It is located on the carburetor cover and is a fine metal mesh. Its pollution occurs very often. This is due to the deposition of oil, additives, dirt on it.Sometimes, when disassembling on the nets, a certain film is found. Therefore, the carburetor does not have enough fuel and the brushcutter either does not start or works intermittently. The cleaning methods are identical to the first reason: an ultrasonic bath, a compressor or a spray bottle with a special solution. In addition, if the mesh is clogged thoroughly, you need to take a soft brush for watercolors, soak it in gasoline and rinse it carefully without damaging it.They have the ability to wear out during operation. From prolonged use, they deform, stretch, lose elasticity, poor-quality fuel corrodes them, and can no longer perform their functions well. This also applies to the needle itself. The fact is that it is covered with a thin layer of rubber, which wears out during operation and can no longer fit tightly into the hole. The brushcutter starts to work intermittently. To eliminate such a breakdown, it is necessary to replace all worn out parts. Where can I get them?In specialized gardening equipment stores, a carburetor kit for a brush cutter of a certain model is sold. The cost of such a repair kit ranges from 40 to 60 hryvnia.It includes two diaphragms, a gasket, a needle valve and a spring.All wear parts of the carburetor can be replaced. Therefore, you should not rush and buy a new one, and you do not need to run to the workshop either, repairs are within the power of any brushcutter user. Professionals claim that the quality of the components in the repair kit even exceeds the characteristics of the native carburetor parts. Therefore, a well-repaired unit will perform better than a new one.In addition, the bubble button for manual fuel pumping may fail. The impact of gasoline on it leads to the fact that during prolonged operation, the rubber corrodes and it begins to stick together or, under the influence of low temperatures, for example, during storage, it bursts. The button should also be replaced if necessary.In addition, its cost is small and will not affect the size of the repair budget in any way.Based on the foregoing, it can be concluded that there are only three main carburetor malfunctions: clogging of channels, contamination of the fine filter and failure of components. In the first two cases, cleaning is enough, and in the third, a repair kit will help.Assembling a brushcutter carburetor is a snap. All steps must be performed in reverse order:Install a spring and a needle valve in the carburetor cover. Hold the spring with your finger and tighten the mounting bolt.Screw the shutter of the air supply system to the product body with two screws.Turn the carburetor over and go to the fuel system assembly. First you need to put the gasket.Install the carburetor cover.Install the main diaphragm.Install the plate with the manual fuel pumping button and tighten the four screws.The carburetor is assembled and ready for further use.For the first time, repairing a brushcutter carburetor may seem like a complicated process, but if you have to disassemble it a second time, then this procedure will not cause much difficulty.If you did not find any of the listed problems in your carburetor, it is recommended to contact a specialized service for help.Trimmer repairs should be carried out as soon as possible at the first sign of breakage so that minor faults do not lead to more serious problems. All models are characterized by the presence of such main nodes and structural elements: drive system (engine), transmission devices, working part (knife or line), belts and handles. Failure can occur in any part, but some components fail much more often than others.Gasoline or electricity powered brushcutters (as well as different models from different manufacturers) differ in design and nature of the problem. Some of them can be easily eliminated with your own hands, while others will require more overhaul or contacting a service center.The most common are breakdowns of a petrol cutter associated with such structural elements:

engine (in particular with a piston system);

carburetor;

barbell;

starter (rope breakage, breakage or spring disengagement);

with an ignition or fuel supply system;

transmission mechanism (reducer);

filters and a silencer.

The symptoms are as follows:

the appearance of uncharacteristic sounds during operation of the brushcutter;

the petrol cutter does not turn on, does not pick up the required speed, or stalls;

when the engine is running, the working part does not rotate or slips;

gasoline leak;

excessive heating of individual units.

Also, minor breakdowns may occur, which are detected without any special diagnostics:

sinking of the start button;

falloff of the limiter;

line breakage or breakage (loss of sharpness) of the knife.

Minor faults are not difficult to fix. Repairing the gasoline trimmer in more difficult cases will require preliminary diagnosis to find out the exact reasons. If you have the appropriate knowledge and skills of locksmith work, then the problems can be eliminated by yourself, replacing the failed parts.To disassemble a petrol cutter for repair work, you will need, in general, the following devices:

a set of screwdrivers (with different tips) and wrenches;

small puller for removing bearings;

special candle wrench;

hammer.

In each case, you will need to disassemble the individual units.It should be borne in mind that the starter (launcher) in a number of models is non-separable - in this case, in case of problems with it, only replacement of the element is possible. If the assembly is disassembled, it can be repaired by removing and replacing the rope and spring, or reinstalling the latter (when it comes out of engagement).It is quite common to repair the trimmer bar.It is a structure of the following parts:

a drive shaft made of steel, having polyhedral or square splines at the upper and lower ends;

aluminum tubes;

a plastic sleeve designed to maintain the centralized position of the drive shaft in the tube (so that there are no vibrations);

a rubber shock absorber needed to connect the rod to the motor;

steering wheel with a handle used for steering and a rack, a belt.

On some models, a shock absorber is located between the steering column and the boom. Everything control elements (lock lever, ignition switch, gas button) are located on the handle.A bevel bevel gear is attached to the lower end of the boom, but some lightweight models are available without it. This is due to the fact that the bar has a curved shape, and the shaft is a flexible cable.How to disassemble the rod and then assemble it to lubricate the shaft or replace it is shown in detail in the video below. In the same way, replace the broken barbell with a new one.