Electric trimmer not picking up speed

Table of Contents:

Features of the trimmer

All trimmers are classified by type of power: gasoline or electricity (mains or battery). It should be noted that gasoline mowers surpass their electric and battery counterparts in many respects. While they all perform similar functions, the differences in performance, agility and efficiency are very noticeable. However, the general principle of operation of all types of hand-held mowers is almost the same. the machines are equipped with motors (two- or four-stroke internal combustion engines or electric motors) that drive the cutting unit (a spool with a fishing line or a metal disc). All elements are fixed to a straight or curved bar, including a trimmer handle, on which the main buttons are located.

electric, trimmer, picking, speed

Since the problem of low revs is more common with petrol trim options, they will receive more attention. So, the lawn mower is very comfortable to work and unpretentious in maintenance. over, most of its malfunctions are caused by the user’s ignorance of elementary things, which are written about in the instructions. Therefore, before starting to operate the unit, you must carefully study the manufacturer’s manual. In particular, to start the engine, the following steps must be taken:

  • turn on the ignition button;
  • press the silicone button several times to pump gasoline;
  • close the air damper;
  • set the throttle lever to the high speed position;
  • first make light jerks with the starter handle to feel the resistance of the engine, then jerk sharply.

If the lawn mower starts but stalled, you need to set the choke to the middle position and try again. When the engine starts working, you need to slow down the gas and open the air damper, since the trimmer functions only on suction.

Important! Trimmer operation depends on various environmental influences. In hot weather, the unit should be given more time to cool down. When operating in dense thickets or tall vegetation, the engine also overheats. It is necessary to take five-minute breaks every 15-20 minutes.

Candle

In case of problems with the candle, it is sometimes enough to dry or clean it with sandpaper and put it back in place, setting the gap correctly. it should be 1 mm. If the candle is heavily soaked, it is better to replace it with a new one. With optimal trimmer operation, the candles do not fail so often.

technical issues

Lawn mowers technical problems mainly take place in the fuel supply and ignition systems. You can deal with them on your own.

  • When the hand mower won‘t start or stalls, the problem may be with the spark plug. Dark carbon deposits indicate poor carburetor adjustment and poor gasoline quality.
  • A clogged fuel hose may be the cause of the trimmer not working correctly. Filters are also often clogged.
  • Another internal problem. the muffler is covered with carbon deposits. From this, the rpm of the trimmer drops dramatically. Exit. you need to clean the muffler.

Important! If the unit does not work due to engine breakdowns, serious problems can arise. In this case, only the destruction of the piston rings belongs to the malfunctions that can be eliminated by hand. For more serious problems with the motor, if there is no guarantee, you should be ready to visit the workshop.

Carburetor

This mechanism is an important part of the petrol trimmer. In order for the carburetor to work properly, several conditions must be met:

  • disassemble and clean it from time to time;
  • adjust the idle speed according to the instructions;
  • seek the help of the wizard when adjusting.

In the event of a breakdown of this unit, you can do its repair yourself, but only if you have certain knowledge.

One of the reasons for poor carburetor performance is a loose cable. To eliminate the problem, you first need to disassemble the entire assembly, and then, after thoroughly rinsing all the parts, lubricate and tighten the cable, but not very much, so as not to stretch.

Important! Other malfunctions can also adversely affect the operation of the carburetor: failure of the inlet needle, deformation of the membrane, wear of the adjusting lever, contamination of the control cavity, wear of flaps.

Motor

The engine is the most important part of any machine. There are several reasons for ICE breakdowns:

  • incorrect proportions of oil with fuel (for two-stroke);
  • old fuel mixture;
  • wear and destruction of the piston ring;
  • traces of scratches on the cylinder and piston;
  • operation of the device for wear.

All this leads to the fact that the engine either does not start or stalls.

Important! If all other parts and trimmer assemblies can be repaired by hand, then you need to be extremely careful with the motor. It is better to entrust this work to a specialist. The piston, oil seals, cylinder, rings can be repaired.

Diagnostics and elimination of gas engine problems

Before proceeding with the repair of a particular unit (part), it is necessary to determine the nature of the malfunction. Step-by-step diagnostics and troubleshooting. more.

Causes of Slow Trimmer RPM

If users complain about the trim tab that does not pick up speed, it means that it works fine at idle, and when you press the gas, it does not develop the necessary power. This can occur as a result of a long idle device without activity. These problems are typical for gasoline vehicles, including Husqvarna 128r, Stihl FS 38 and Hitachi of various modifications.

When working with the trimmer, you need to monitor its behavior all the time. a drop in speed and unusual noises signal a malfunction in the unit. Sometimes you give the gas, and the trimmer floats. In such cases, the work should be immediately suspended, the mechanism should be allowed to cool down and the search for possible problems should be started. They can be of a different nature, both a technological plan and external factors associated with the conditions and features of the operation of the apparatus.

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Low quality fuels

The trimmer does not develop revs if filled with low quality fuel. For this reason, the engine may not start at all or work “jerky”, changing the speed of rotation of the knife or fishing line.

To independently determine the quality of the gasoline used, perform the following steps.

  • The candles are removed with a special key.
  • Examine their working contacts for the presence of a red brick-colored plaque: if there is one, then the fuel used contains significant inclusions of additives.

Candles in general often act as indicators to identify problems with the combustion chamber of a gasoline engine, because they can be quickly removed and inspected.

If a deposit is found, it is necessary to drain the fuel poured into the tank and replace it with a quality one. The lawn mower used must be filled only with the brands of gasoline specified by the manufacturers in the operating instructions. It is also imperative to clean the candles from plaque before reinstalling.

Engine problems

If everything is in order with the fuel, filters and spark plug, then the next source could be a gasoline engine. He may have the following mechanical failures:

  • carburetor problems;
  • problems with the drive mechanism of the engine.

There is a small cable in the carburetor section. It can subside and lead to the problem in question. Therefore, when dealing with the carburetor, you should first check the condition of the cable, and, if necessary, tighten it (but not to the limit). The main thing is not to overdo it with a stretch, so that it does not crack under load.

Carburetor cables

Then you need to check the operational settings of the carburetor, which must correspond to the parameters given in the instructions. If they are installed correctly, but there is no desired effect, then the part should be disassembled, rinsed, cleaned, pumped through all its strokes and assembled back. The carburetor itself must be free of mechanical damage.

If it is impossible to independently restore the performance of the carburetor, it is better to replace it with a new part or resort to the services of professionals.

How to fix clippers that don’t cut

In the event that adjusting or replacing the carburetor does not give the desired result, it is necessary to clean the drive mechanism and lubricate the cable inside it with oil.

Engine problems can be eliminated with your own hands if you have the required skills, but it is better to use the services of a service center for this. Its specialists will carry out a comprehensive diagnostics of the trimmer and establish the exact cause of the drop in speed.

Why is the rpm drop on the trimmer?

This common problem has a variety of different causes. While working with the device, you can encounter both obvious malfunctions, the signs of which are clearly traced, and asymptomatic cases. The first option is the simplest from the point of view of finding a problem. If the trimmer does not pick up speed, and there are no clear signs of breakdowns, then you will need to consistently check the most typical cases of malfunctions, and if the cause is found, eliminate it.

Common Causes of Low Speed ​​Lawn Mowers

The problem, when the lawn mower does not pick up speed, occurs mainly with gasoline units. This affects the equipment of various models, for example, Husqvarna, Champion, Stihl.

Such problems are less common with high-quality products than with cheap ones from unknown manufacturers.

Some of the structural elements with which problems may be associated are available for visual inspection, and to check the functioning of the remaining units, you will need to disassemble the lawn mower.

Failure in the fuel circulation system

Failure to properly circulate fuel on the trimmer will also result in the mower not picking up speed. This can be due to the following main reasons:

  • air leaks, which are caused by cracks in the hoses;
  • clogging of the gasoline pump, which occurred due to the use of low-quality fuel or due to the formation of sediment at the bottom of the tank and getting it into the system;
  • dirty muffler or catalyst.

To troubleshoot the considered problems yourself, you need to do the following:

  • go over the gas pump, removing dirt;
  • replace pipes and hoses through which fuel circulates;
  • clean the muffler and the mesh on it;
  • put in a new catalyst, which is expensive due to the precious metal content.

All work on troubleshooting the fuel circulation system can be done independently. But it should be done carefully so as not to lose details, or after assembling the braid there are no “extra”.

Spark plug problems

Spark plugs become dirty and worn over time with continuous use. To check this, they are removed and inspected for carbon deposits. The problem can be eliminated in two ways: if possible, restore the old candle, or simply replace it with a new one.

In the first case, they act like this:

  • unscrew and wipe the spark plug from the fuel;
  • dry it without calcining;
  • using a file or fine sandpaper, remove carbon deposits from the candle and check the gap between the electrodes (should be 1 mm);
  • collect trimmer;
  • start a lawn mower.

If the candle does not emit a spark after recovery manipulations at the desired distance between the electrodes, then you will need to check the quality of the connections of the electrical circuit elements of the device. When the wires are in complete order, you will need to unambiguously install a new part.

Replacing candles is a simple process that is cheap, and if you can restore old ones, it is generally free. For work, you only need a candle wrench and a file.

If there is a regular rapid pollution and wear of the candles, then you need to look for the problem of these abnormal phenomena deeper.

Dirty air or fuel filter

Another common cause of reduced trimmer rpm is a dirty trimmer air or fuel filter. In the first case, the problem is that the fuel-air mixture entering the combustion chamber is not sufficiently saturated with oxygen, as a result, not all gasoline is burned out. This prevents the mower from developing its maximum power.

In order to check whether the air filter is really to blame, you need to remove it (after unscrewing the cover for this) and turn on the lawn mower. If it works normally, then instead of the clogged filter element, insert a new one.

If the situation has not changed after the actions taken, then you need to pay attention to the fuel filter. The essence of the problem is similar to the previous case, only instead of a lack of oxygen, little gasoline is supplied for the normal operation of the device. This problem can also be eliminated by simply replacing the filter element. Air and fuel filters are inexpensive. It is easy to change them yourself, and the whole work does not take much time.

It should be borne in mind that it is forbidden to operate the trimmer without a fuel filter, otherwise it will be necessary to repair the piston unit after a short time.

Engine problems

If everything is in order with the fuel, filters and spark plug, then the next source could be a gasoline engine. He may have the following mechanical failures:

  • carburetor problems;
  • problems with the drive mechanism of the engine.
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There is a small cable in the carburetor section. It can subside and lead to the problem in question. Therefore, when dealing with the carburetor, you should first check the condition of the cable, and, if necessary, tighten it (but not to the limit). The main thing is not to overdo it with a stretch, so that it does not crack under load.

Carburetor cables

Then you need to check the operational settings of the carburetor, which must correspond to the parameters given in the instructions. If they are installed correctly, but there is no desired effect, then the part should be disassembled, rinsed, cleaned, pumped through all its strokes and assembled back. The carburetor itself must be free of mechanical damage.

If it is impossible to independently restore the performance of the carburetor, it is better to replace it with a new part or resort to the services of professionals.

In the event that adjusting or replacing the carburetor does not give the desired result, it is necessary to clean the drive mechanism and lubricate the cable inside it with oil.

Engine problems can be eliminated with your own hands if you have the required skills, but it is better to use the services of a service center for this. Its specialists will carry out a comprehensive diagnostics of the trimmer and establish the exact cause of the drop in speed.

Low quality fuels

The trimmer does not develop revs if filled with low quality fuel. For this reason, the engine may not start at all or work “jerky”, changing the speed of rotation of the knife or fishing line.

To independently determine the quality of the gasoline used, perform the following steps.

  • The candles are removed with a special key.
  • Examine their working contacts for the presence of a red brick-colored plaque: if there is one, then the fuel used contains significant inclusions of additives.

Candles in general often act as indicators to identify problems with the combustion chamber of a gasoline engine, because they can be quickly removed and inspected.

If a deposit is found, it is necessary to drain the fuel poured into the tank and replace it with a quality one. The lawn mower used must be filled only with the brands of gasoline specified by the manufacturers in the operating instructions. It is also imperative to clean the candles from plaque before reinstalling.

Common Causes of Low Speed ​​Lawn Mowers

The problem, when the lawn mower does not pick up speed, occurs mainly with gasoline units. This affects the equipment of various models, for example, Husqvarna, Champion, Stihl.

Such problems are less common with high-quality products than with cheap ones from unknown manufacturers.

Some of the structural elements with which problems may be associated are available for visual inspection, and to check the functioning of the remaining units, you will need to disassemble the lawn mower.

Spark plug problems

Spark plugs will become dirty and worn out over time with continuous use. To check this, they are removed and inspected for carbon deposits. The problem can be eliminated in two ways: if possible, restore the old candle, or simply install a new one in its place.

In the first case, they act like this:

  • unscrew and wipe the spark plug from the fuel;
  • dry it without calcination;
  • using a file or fine sandpaper, remove carbon deposits from the candle and check the gap between the electrodes (should be 1 mm);
  • collect trimmer;
  • start a lawn mower.

If the candle does not emit a spark after recovery manipulations at the desired distance between the electrodes, then you will need to check the quality of the connections of the electrical circuit elements of the device. When the wires are in complete order, you will need to unambiguously install a new part.

Replacing candles is a simple process that is cheap, and if you can restore old ones, it is generally free. For work, you only need a candle wrench and a file.

Trimmer working slow ? | Fixed!!

If there is a regular rapid pollution and wear of the candles, then you need to look for the problem of these abnormal phenomena deeper.

Possible causes of a problem with electric streamers

When using the trimmer, on which the electric motor is installed, problems with a set of revolutions also occur. But they are caused by completely different problems, compared to the fuel streamers. The electric motor does not develop the required rotation speed in such cases:

  • if the voltage in the supply network is lower than the rated value for the electric motor by more than 10%;
  • in case of malfunctions in the soft start system (if this unit is installed);
  • when there are problems with the brush assembly;

Electric scythe brush unit

  • in the event of a burn out of the engine windings;
  • if wedging of rotating parts occurs.

To eliminate the problem with the voltage, you need to check its value with a multimeter or tester in the outlet from which the electric power is taken. If it is less than the minimum permissible value, then to increase it, you will need to turn off all electrical appliances or install a stabilizer.

A prerequisite for the normal operation of the trimmer is the use of an extension cord with a cross-section of conductors corresponding to the power of the streamer motor.

To repair the soft starter, you will need to have the appropriate knowledge in electronics, so it is better to contact a service center. There they will decide on its maintainability or the need to replace it. You can check the button yourself or find the block diagram and try to figure it out.

Soft starter block

The brushes may wear out and contact will be lost as a result, causing the motor to stall. The brushes are easy to replace. The features of the process are determined by the lawn mower model used. Along the way, you will also need to clean all contacting surfaces.

If the windings are burnt, if you continue to mow grass or bushes, the electric motor will quickly burn out. This will be accompanied by the appearance of a burning smell, up to the melting of individual parts. You will need to replace the electric motor.

Wedging of rotating parts occurs for various reasons. To identify and eliminate them, you will need to sort out the drive unit. There are models in which the number of revolutions is automatically adjusted depending on the load, increasing with its increase. at idle, the rotation speed drops.

The video shows an algorithm of actions to identify the most common reasons why the trimmer does not pick up the required speed:

Dirty air or fuel filter

Another common cause of reduced trimmer RPM is dirty air or fuel filters. In the first case, the problem is that the fuel-air mixture entering the combustion chamber is not sufficiently saturated with oxygen, as a result, not all gasoline is burned out. This prevents the mower from developing its maximum power.

In order to check whether the air filter is really to blame, you need to remove it (after unscrewing the cover for this) and turn on the lawn mower. If it works normally, then instead of the clogged filter element, insert a new one.

If the situation has not changed after the actions taken, then you need to pay attention to the fuel filter. The essence of the problem is similar to the previous case, only instead of a lack of oxygen, little gasoline is supplied for the normal operation of the device. This problem can also be eliminated by simply replacing the filter element. Air and fuel filters are inexpensive. It is easy to change them yourself, and the whole work does not take much time.

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It should be borne in mind that it is forbidden to operate the trimmer without a fuel filter, otherwise it will be necessary to repair the piston unit after a short time.

Why is the rpm drop on the trimmer?

This common problem has a variety of different causes. While working with the device, you can encounter both obvious malfunctions, the signs of which are clearly traced, and asymptomatic cases. The first option is the simplest from the point of view of finding a problem. If the trimmer does not pick up speed, and there are no clear signs of breakdowns, then you will need to consistently check the most typical cases of malfunctions, and if the cause is found, eliminate it.

Failure in the fuel circulation system

Failure to properly circulate fuel on the trimmer will also result in the mower not picking up speed. This can be due to the following main reasons:

  • air leaks, which are caused by cracks in the hoses;
  • clogging of the gasoline pump, which occurred due to the use of low-quality fuel or due to the formation of sediment at the bottom of the tank and getting it into the system;
  • dirty muffler or catalyst.

To troubleshoot the considered problems yourself, you need to do the following:

  • go over the gas pump, removing dirt;
  • replace pipes and hoses through which fuel circulates;
  • clean the muffler and the mesh on it;
  • put in a new catalyst, which is expensive due to the precious metal content.

All work on troubleshooting the fuel circulation system can be done independently. But it should be done carefully so as not to lose details, or after assembling the braid there are no “extra”.

gas trimmer loves cleanliness. It is necessary to monitor the cleanliness of the air filter and fuel. Gasoline bought at a gas station is better to stand for 2 days and pass through the simplest filter. a piece of bike cloth.

We check the electrical equipment as follows:

We unscrew the candle, inspect the gap between the electrodes. We can set the correct gap between the electrodes in the “old-fashioned” way. We take the razor blade, break it in half and insert a homemade probe between the electrodes. If the blades fit tightly, then the gap is perfect.

We put the cap of the high-voltage wire on the candle and lean the candle against the metal surface of the engine. We pull the starter several times. If the spark hits one point well, then the gap is adjusted correctly. If not, the spark is weak or “wandering”, then it is necessary to re-adjust the gap between the electrodes.

It should also be remembered that a piece of cable, spun by centrifugal force when the trimmer head rotates, flies like a bullet. Imagine what would happen if it hits the leg or someone’s eye?

Using a cable, wire, or multicore cable instead of a fishing line leads to a quick breakdown of the trimmer. In addition, it is a direct violation of safety regulations.!

FS 38

The model is distinguished, first of all, by its simplicity and compactness, which is quite enough for proper maintenance of the local area. The main control keys are located on the handle of the device, which greatly facilitates and speeds up the work.

The Stihl FS 38 mower is priced around 130.

  • engine power. 0.9 hp;
  • engine displacement. 27.2 cm3;
  • tank volume. 0.33 l;
  • engine type. two-stroke;
  • barbell. straight;
  • handle. D-shaped;
  • complete set. 2-toothed grass trimmer blade, goggles for protection, belt;
  • weight. 4.1 kg.

Stihl FS 38

This model is one of the most popular on the market! You will find out about all the units that are included in the rating of the best lawn mowers here.

Why is the Chinese lawn mower not picking up speed??

The trimmer does not gain momentum, a very frequent discrepancy and of course does not always have the usual solution.

During the engine running-in period (this is approximately the work of the trimmer on 2-3 tanks), the amount of oil can be increased. For example, mix it with gasoline in a 30: 1 ratio.

A small amount of oil mixed with gasoline leads to increased wear of the cylinder-piston group. An excess of oil in the mixture, although not so fatal, is also harmful. Coking of the piston rings, rapid formation of carbon deposits in the combustion chamber, and a drop in engine power may occur. In addition, the muffler mesh screen is coked. Therefore, some users (after the end of the warranty period for the trimmer) recommend dismantling it.

The gasoline used in the lawn mower is AI 92. The brand of gasoline is precisely specified in the operating instructions. You should not try to “force” the engine by pouring 95th gasoline into it. This can cause overheating, erratic trimmer operation and breakage.

It is not recommended to leave fuel in the trimmer tank during extended shutdowns. It is better to end the working day with the entire mixture completely exhausted. If this is not done, then, since the gasoline will evaporate from the engine overnight, and a thin film of oil will remain, the carburetor jets may become clogged. This will cause difficulty the next time you start the engine.

It is also necessary to observe safety precautions when storing fuel. Many people pour gasoline into a plastic water bottle. Is it worth doing this?

In no case should you store gasoline in a plastic container from under water. When mixing the fuel mixture, a static charge accumulates, you can “catch” a spark.

Therefore, at gas stations it is not allowed to fill gasoline in plastic cans, only in metal ones. Before pouring gasoline into a metal canister, it is better to put it on the ground, so static is removed from the body.

But there are situations when simple manipulations with the lawn mower do not help. The engine still won’t start. In this case, we are going to check the power supply and ignition system, guided by the rule “the engine does not work if there is nothing to burn or nothing to ignite”.

Any braid has a knife on the protective cover, which cuts off excess fishing line after winding, and the cable is no longer cut. If part of the cable breaks off, then the result is an imbalance, increased vibration. Bottom line: shaft drive bearings break.

See the trimmer instructions for the continuous running time of the lawn mower. On average, we mow for 15-20 minutes, after which we turn off the trimmer and let it cool for 3-5 minutes. Weather conditions also affect the duration of continuous operation. In hot weather, when mowing tall grass, thickets of weeds, under heavy load, the trimmer overheats faster.

Many lawnmower problems arise from improperly prepared fuel mixtures. In two-stroke engines, lubrication is carried out with a special oil (not ordinary engine oil!), Mixed with gasoline. If the oil is not mixed with gasoline, the lawn mower will quickly fail. Mix the oil / gasoline in the proportion indicated in the trimmer instructions. Usually it is 1:40 or 1:50.

The question often arises: the proportion of 1:50 is how much oil and gasoline?