Hot Trimmer Does Not Develop Rpm

Troubleshooting methods

The first three reasons are fairly easy to eliminate. If the matter is in the mixture, it is necessary to pour out the old fuel from the tank, prepare a new emulsion from high-quality gasoline and engine oil (if your engine requires a mixture) and pour it into the fuel tank. If the trimmer is running on pure gasoline, it’s still easier.

In the second case, it is necessary to carefully free the trimmer parts from the wound grass.

If the filter is clogged, you can try rinsing it. If this procedure does not work, replace it with a new one.

The last reason a lawn mower is not working properly will require a little more knowledge and skill from you.

To properly adjust the carburettor for lawn mowers, a specific procedure must be followed. First, clean the air filter thoroughly. The easiest way is to rinse it (it is advisable to douse the filter with water regularly after 9-10 hours of operation).

After that, in the diagram of your trimmer, which is in the operating instructions for the device, find the adjustment screws. There are usually three of them: the first is responsible for fuel supply, the second is for idling, and the third is designed to limit the number of maximum engine speed.

Next, turn on the unit and wait for the engine to warm up.

Tighten the first (fuel mixture) adjusting screw slowly. Catch the moment when the motor starts to stall and turn the propeller back 45 degrees. If you did not have time and the motor stalled, the screw should be turned 90 degrees. Open the throttle and watch the revs increase. Next, slowly unscrew the screw (each turn is the same 45 degrees) until the moment when, at full throttle, the engine begins to firmly give out maximum revolutions.

The second screw, as mentioned above, controls the engine idle speed. By loosening it, you decrease the number of revolutions, while twisting it, you increase it. The screw needs to be adjusted so that the motor runs reliably at low revs. For better starting, speed up the engine slightly. At the same time, make sure that the motor rotates several tens of times before starting the movement of the knives / line reel. If the engine starts poorly, tighten the screw a little.

After you have adjusted the first two screws, test the operation of the unit at maximum engine speed. If necessary, you can limit it (maximum). this will protect the motor from “boiling”. To do this, you need to tackle the third screw. Unscrew the locking nut until the adjusting screw can be safely turned. To increase the maximum number of revolutions, the screw must be loosened, to decrease. on the contrary, tighten. Fix the position of the screw with a nut. Test the motor again.

Check the position of the screws regularly. the high vibration levels of lawn mowers can cause them to move unintentionally.

Remember that carburetor adjustment is not a final procedure. During the operation of the lawn mowers, you will most likely have to tinker with it more than once, because an unbalanced carburetor means both increased fuel consumption and a quick failure of the candles, not to mention a decrease in the power and performance of the device.

Causes

Trimmers are reliable and durable (provided they are properly maintained, of course). Most often, malfunctions occur due to contamination of structural elements.

If the motor of your lawn mower does not start, does not pick up speed, does not reach the power you need, or suddenly stalls, the reason may be:

  • low-quality fuel (fuel mixture), the case may be in long-term storage or in non-compliance with the recipe for preparing the mixture;
  • grass is wrapped around the shaft of the fishing line / knife;
  • clogged air filter / muffler;
  • unbalanced carburetor.

The gasoline trimmer is not gaining momentum: the reasons and features of the repair

It is not necessary to purchase an expensive and bulky lawn mower to cut grass on a small lawn; it can be easily replaced by a gasoline / electric trimmer. The device of these machines is quite simple, they are easy to use and unpretentious in maintenance. But sometimes problems do happen. One of them. when the trimmer does not develop the maximum number of revolutions. will be discussed in this article.

Little tricks

  • If you are unable to tighten / loosen the adjusting screws properly, it may be that the spring is too thick and stiff. Then you can choose instead of her a more suitable.
  • If your unit does not need pure gasoline, but its mixture with engine oil, strictly observe the proportions indicated in the operating instructions. There is one little thing: the recommended ratio is 1: 25 (for all brands of oil) or 1: 50 (for “native” oils). Try the first ratio first. If, with such a recipe, oil drips appear on the motor, and a strong carbon deposit forms on the candle, reduce the proportion of oil by half. This usually contributes to the disappearance of traces and a reduction in the amount of carbon deposits.
  • To clean the spark plug electrodes from combustion products, you can use fine-grained “sandpaper”. Wipe them down with a dry cloth first and then gently sand them with sandpaper. If the space between the body of the device and the insulator is also clogged, a regular unbent paper clip can help clean it. To do this, briefly soak the candle in diesel fuel, and then scrape off the dirt. If the blockage is small, one procedure is sufficient. In case of heavy dirt, it is sometimes necessary to repeat it several times. After complete cleaning, the candle must be wiped dry from the remaining diesel fuel, and then it can be used as directed.
  • Please note that foreign-made lawn mowers (gasoline, electric or battery) require a little more maintenance than domestic ones. In particular, many strongly recommend entrusting the adjustment of the carburetor of a two-stroke engine to professionals, especially if your purchase has not expired the warranty period.
  • And finally, one more tip: follow all the manufacturer’s recommendations for the operation and maintenance of the device. This will prolong its smooth operation.

You will learn more about what to do if the petrol trimmer is not picking up speed.

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.

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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 high vegetation, the engine also overheats. Take five-minute breaks every 15-20 minutes.

Candle

In case of problems with the candle, sometimes it is 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.

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;
  • contact the wizard for adjustment.

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.

When to contact the workshop

If the device is under warranty, at the first signs of incorrect operation it can be safely taken to a specialized workshop. The repair will be done free of charge, regardless of the nature of the damage, if it happened through no fault of the owner. In case of engine breakdowns, a person who is ignorant of technology is better off immediately contacting a specialist. In any case, the severity of problems with the unit is determined by the user.

Summarize. Both gasoline and electric trimmers are built to provide years of reliable performance. Most of the problems described above occur due to the owner’s lack of attention to his assistant. Subject to strict adherence to the manufacturer’s requirements and regular maintenance, the hand mower will work rhythmically and without interruption.

Filters

A clogged air filter is another reason for the unreliable operation of the device. To check the involvement of this element in the malfunction, you need to start the lawn mower without it. A dirty filter can be washed in gasoline, dried or replaced with a new one.

A clogged fuel filter does not allow fuel to enter the cylinder, and the engine stalls at full throttle due to an elementary shortage of gasoline. This element is located inside the tank on the intake hose. To fix the problem, instead of the old filter, put a new one on the hose or thoroughly rinse the one that was removed.

Advice! If you try to remove the plug in the tank, the hose and filter may fall into the tank. You can get them with tweezers.

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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.

The trimmer does not gain momentum. what to do

Any person who owns a summer cottage or land plot is well aware of the problems of dealing with excess vegetation. Now a trimmer has come to the rescue, which has successfully replaced the usual braid in this field. This unit is very convenient in operation, but it, like any mechanism, tends to fail due to difficult working conditions or incorrect operation. Situations when the trimmer does not pick up speed are quite common. To understand this problem, it is necessary to understand some aspects related to the operation of the apparatus.

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 (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 operating 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, washed, 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.

Problems related to the engine 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 will 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 plaque: if there is one, then the fuel used contains significant inclusions of additives.
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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. Also, be sure to clean the candles from plaque before reinstalling.

Dirty air or fuel filter

Another common cause of reduced trimmer RPM is a dirty trimmer air filter 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, but 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.

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.

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 malfunctions in comparison with 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 a 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 can wear out, resulting in loss of contact, which leads to stalling of the electric motor. 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 as it increases. 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:

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 install a new one in its place.

In the first case, they act like this:

  • unscrew and wipe off the fuel candle;
  • 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.

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.

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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 will be expensive due to the precious metal content.
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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”.

Causes

Trimmers are reliable and durable (provided they are properly maintained, of course). Most often, malfunctions occur due to contamination of structural elements.

If the motor of your lawn mower does not start, does not pick up speed, does not reach the power you need, or suddenly stalls, the reason may be:

  • low-quality fuel (fuel mixture), the case may be in long-term storage or in non-compliance with the recipe for preparing the mixture;
  • grass is wrapped around the shaft of the fishing line / knife;
  • clogged air filter / muffler;
  • unbalanced carburetor.

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.

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 high vegetation, the engine also overheats. Take five-minute breaks every 15-20 minutes.

Carburetor

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

trimmer, does, develop
  • disassemble and clean it from time to time;
  • adjust the idle speed according to the instructions;
  • contact the wizard for adjustment.

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.

Dirty air or fuel filter

If the lawn mower is not gaining momentum, the reasons may lie in the contamination of the filter element: air or fuel.

trimmer, does, develop

When the air filter becomes clogged, there is a lack of oxygen in the combustion chamber, so the fuel is not fully produced, which prevents the development of the required speed and power.

To check if the reason is the air filter, you need to remove it and turn it on. If the lawnmower is still not picking up speed, the reasons are not in it. So you should check the fuel filter element. Here everything is the same, only gasoline acts as oxygen. If this filter is damaged, there will be a lack of fuel, which slows down the development of speed.

Filters

A clogged air filter is another reason for the unreliable operation of the device. To check the involvement of this element in the malfunction, you need to start the lawn mower without it. A dirty filter can be washed in gasoline, dried or replaced with a new one.

A clogged fuel filter does not allow fuel to enter the cylinder, and the engine stalls at full throttle due to an elementary shortage of gasoline. This element is located inside the tank on the intake hose. To fix the problem, instead of the old filter, put a new one on the hose or thoroughly rinse the one that was removed.

Advice! If you try to remove the plug in the tank, the hose and filter may fall into the tank. You can get them with tweezers.

Candle

In case of problems with the candle, sometimes it is 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.

Diagnostics and elimination of problems of electric motors

Trimmer malfunctions can be as follows:

  • insulation failure or cable break;
  • malfunctions in the area of ​​the cutting tool;
  • damaged socket or plug.

To cope with these breakdowns, you do not need to disassemble the entire apparatus.

On a note! Before starting the repair, it is important to prepare the necessary tool: a set of screwdrivers, a tester, a soldering iron, an indicator, a set of keys.

In case of serious engine malfunctions, you will have to disassemble it. To do this, you need to unscrew a few screws. Having gained access to the details of the motor, you need to carry out the following actions:

  • check the degree of wear of the brushes. unsuitable parts will need to be replaced with new ones;
  • ring the motor winding. the resistance must be high;
  • check the stator and rotor. to test the rotor winding with a multimeter, measure the resistance: large deviations from the norm indicate a malfunction, the absence of resistance on the stator winding also indicates a breakdown (in a similar way, the stator case is diagnosed).

Advice! Solving problems associated with faulty electrical components is fraught with difficulties. It is often easier to replace them with new parts than to waste time on rewinding.

Low rp problems are common with cheap trimmers. However, if improperly maintained, this also affects hand mowers such as the Huter, Patriot 3055, Echo.