Why the gasoline trimmer doesn’t pick up speed.

Grass trimmer does not pick up speed. causes and troubleshooting

Why a STIHL, Husqvarna, Champion gasoline or electric grass trimmer won’t pick up speed. Why does the trimmer’s speed drop This common problem has a number of different reasons. While working with the device, you can meet with both obvious problems, signs

grass trimmers are reliable and durable (assuming proper care, of course). The most frequent malfunctions occur due to contamination of the design elements.

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

• Poor-quality fuel (fuel mixture), it may be due to long-term storage or failure to comply with the formulation of the mixture;
• there is grass on the line/blade head shaft;
• the air filter/muffler is clogged;
• carburetor imbalance.

When to go to a workshop

If the machine is under warranty, at the first signs of incorrect operation it can safely be taken to a specialized workshop. Repair will be done free of charge, regardless of the nature of the damage, if it was not the fault of the owner. When an engine malfunctions, it is better for a person who is not technically proficient to immediately contact a specialist. In any case, the degree of seriousness of the problems with the unit is determined by the user himself.

To summarize. Both gasoline and electric trimmers for grass are designed for many years of reliable operation. Most of the problems described above are the result of lack of attention. If the manufacturer’s requirements are strictly observed and regular maintenance is performed, the hand mower will operate rhythmically and without interruptions.

Diagnosing and troubleshooting electric motor problems

Faults in electric trimmers can be as follows:

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

To recap! Before you start the repair, it is important to prepare the necessary tools: a set of screwdrivers, a tester, a soldering iron, an indicator, a set of keys.

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

• Check the degree of wear on the brushes. unusable parts will need to be replaced with new ones;
• test the motor winding. the resistance should 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 lack of resistance on the stator winding also indicates a breakdown (the same way to diagnose the stator housing).

Tip! Solving problems related to faulty electrical components is difficult. It’s often easier to replace them with new parts than to take the time to rewind.

Low RPM problems are common with cheap trimmers. However, if improperly serviced, such hand-held mowers as Huter, Patriot 3055, Echo also suffer from this.

lawnmower stops at high engine speeds

During operation, it can happen that the rotational speed of the machine begins to decrease, not increase, when you press the fuel button. Failure of this nature can be caused by:

Fuel hoses on brushcutter with filter

• air blowing into the combustion chamber;
• Problems with the circulation of the fuel mixture;
• clogging of the breather in the fuel tank cap (cleaning the hole with a fine sewing needle);
• improper adjustment of the carburetor.

In case of air leakage during the engine operation it is necessary to check the tightness of connection pipes and the integrity of gaskets in the cylinder head. Fuel mixture circulation problem can be solved by removing blockages in the fuel pipes leading to the carburetor. If there is vacuum in the tank and the fuel mixture does not come to the carburetor, it is sufficient to clean the breather plug with a fine needle and blow it with air.

Possible causes of malfunctions in the electric lawnmowers

When operating a trimmer for grass, which has an electric motor, problems with the revolutions set also occur. But they are caused by entirely different problems, compared to fuel-powered mowers. The electric motor does not develop the required rotation speed in such cases:

• If the effective mains voltage is more than 10% below the motor nominal voltage;
• in case of malfunction in the soft start system (if this unit is installed);
• when there is a problem with the brush assembly;

To exclude voltage problem. If you use a multimeter or a tester to check the voltage at the socket from which the electric motor is being powered. 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.

Precondition for the correct operation of the weed trimmer is the use of an extension cord with a cross section that matches the engine capacity of the weed trimmer.

For Repair of the soft starter You will need the appropriate knowledge of electronics, so it is better to apply to the service center. There determine its repairability or the need for replacement. You can check the button or find a diagram of the block and try to figure it out yourself.

brushes Can wear out, resulting in a loss of contact, which leads to stopping the motor. Brushes can be replaced in no time. The process features are determined by the model of brushcutter used. You will also need to clean all the contact surfaces at the same time.

In the case of burning of the windings. If you keep mowing grass or brush, the motor will burn out quickly. It will be accompanied by a smell of burning, up to the melting of individual parts. The electric motor must be replaced.

The rotating parts become jammed jamming on the rotating parts of the brush rollers can occur for various reasons. For their detection and elimination it is necessary to reconstruct the drive unit. There are also models where the RPM is automatically adjusted depending on the load, increasing as the load increases. their idle speed is reduced.

The video shows an algorithm for identifying the most common reasons why the grass trimmer does not pick up the required revolutions:

Problems with engine starting

Correctly identifying the cause of the failure is very important, because otherwise we just can’t fix it. If there are no extraneous noises when trying to tune the chainsaw (knocking down, grinding, etc. Д.), Often it turns out that there is actually no problem. For example, if you start the chainsaw incorrectly and pull the fork for a long time, the engine just pours and starts very hard.

To start the chainsaw engine properly, set the lever or switch to the “flap” position. Then you need to pump the mixture into the carburetor if there is a fuel pump. Pull out the starter handle until the engine resistance is noticeable and vigorously pull the amplitude by taking your hand to the side. After two. Three such movements, the motor should first start, and then decay. If it does not, then you must move the lever to the half throttle position or simply to the operating position and then continue to operate the chainsaw in this mode. Many chainsaws “half throttle” lock automatically when the air damper is pulled. Some models have a keyed ignition, it’s important to make sure it’s on.

If the engine won’t start, the first thing to do. Unscrew the spark plug and check it. There are cases when the plant fills the burner with fuel in the cold season. Then you also need to unscrew the spark plug, dry the combustion chamber with one plant, clean the spark plug, screw it in and repeat the start. It’s a good idea to check for a spark right away. on the twisted plug we put a cap with a high voltage wire, we put it on the cylinder and we pull the starter. Look at the blue spark plug and look for frequent sparking. OK. We twist the spark plug into place and start it. If there is no spark, change the spark plug and try again. Again, it’s not. check the connection of the high-voltage wire to the spark plug, coil and ignition system.

In general, the condition of the spark plug can be used to determine the type of fault.

• Dry. Most likely the fuel mixture is not entering the cylinder. It is not an ignition system, so the spark plug is screwed in and checked.
• Wet, heavily spattered with fuel. The cause of excessive fuel mixture is due to improper starting as described above, or improper carburetor adjustment.
• Coated with black carbon. This could indicate the use of poor quality oil, an improperly tuned carburetor, or an improperly calculated gasoline to oil ratio. The spark plug should be washed, cleaned of carbon deposits with a sharp object (awl or needle), wiped with a cloth over the electrodes, and reinstalled.

Checking the spark plug, you need to pay attention to the gap between the electrodes: the norm is considered from 0.5 to 0.65 mm. A damaged or worn gasket should be replaced.

A properly adjusted carburetor chainsaw ensures that it performs to its full potential with the most economical fuel consumption.

The need for carburetor chainsaw adjustments is infrequent, as adjustments are initially made by the manufacturer to achieve optimum performance. Adjustment screws are designed to adjust the carburetor chainsaw more accurately, if necessary.

The following are the most common causes of misalignment of the adjusting screws

• Strong vibration or damage to the protective cap. It is rare, but it does happen.
• Severe engine (piston) wear. Of course, in this case, it is better to take care of the repair of the chainsaw, but the adjustment of the carburetor can improve its functionality for some time.
• The droppings in the carburetor due to, low quality gasoline or scale build-up. In this case, in addition to adjusting the carburetor, it can be avoided.

Problems with starting the engine

Correctly identifying the cause of the failure is very important, because otherwise we just can’t fix it. If there are no extraneous noises when trying to tune the chainsaw (knocking down, sanding, etc. Д.), it often turns out that there really is no problem. For example, if you don’t start the chainsaw correctly and pull the fork for a long time, the engine just pours and starts very hard.

To properly start the chainsaw engine, set the lever or switch to the “flap” position. Then you need to pump the mixture into the carburetor, if a fuel pump is available. Pull out the starter handle until engine resistance is noticeable, and vigorously pull out the amplitude by taking your hand to the side. After two. Three such motions, the engine should start first and then decay. If this does not happen, then it is necessary to put the lever in the half throttle position or just in the working position, and then continue to operate the chainsaw in this mode. Many chainsaws “half throttle” lock automatically when the air damper is pulled. Some models have a keyed ignition, it is important to make sure it is on.

If the engine doesn‘t start, the first thing to do. Unscrew the spark plug and check it. There are times when the plant fills the burner with fuel during the cold season. Then too unscrew the spark plug, dry the combustion chamber with one plant, clean the spark plug, screw it in and try the starter again. It is prudent to immediately check for a spark. On a twisted spark plug we put a cap on the high voltage wire, we put it on the cylinder, and we pull the starter. Visually observe the frequent blue spark. OK. We twist the spark plug into place and start it. If there is no spark, change the spark plug and try again. Again, no. Check the connection of the high-voltage wire to the spark plug, coil and ignition system.

In general, the condition of the spark plug can be used to determine the type of fault.

• Dry. Most likely, the fuel mixture is not entering the cylinder. This is not an ignition system, so the spark plug is screwed in and checked.
• Wet, heavily spattered with fuel. The cause of excessive fuel mixture is due to improper starting as described above or improper carburetor adjustment.
• Covered with black carbon. It can indicate the use of low-quality oil, improperly tuned carburetor or improperly calculated ratio of gasoline and oil. The spark plug should be washed, cleaned of carbon deposits with a sharp object (awl or needle), wiped electrodes with a cloth and reinstalled.

Checking the spark plug, pay attention to the gap between the electrodes: the normal is considered 0.5 to 0.65 mm. A damaged or worn gasket should be replaced.

A properly adjusted carburetor chainsaw provides its full power efficiency with the most economical fuel consumption.

The need for carburetor tuning of a chainsaw is infrequent, because the adjustment is initially performed by the manufacturer to achieve optimum operation. The adjusting screws are designed to adjust the carburetor chainsaw more precisely, if necessary.

Among the most common causes of improper fixation of the adjustment screws are the following:

• Strong vibration or damage of the protective cap. It happens rarely, but it still happens.
• Severe engine (piston) wear. Of course, in this case, it is better to take care of the repair of the chainsaw, but the adjustment of the carburetor can improve its functionality for some time.
• Dirt in the carburetor due to, low quality gasoline or scale build-up. In this case, in addition to adjusting the carburetor, it can be avoided.

What to do if the gasoline trimmer does not pick up speed?

If you have ever purchased a grass trimmer that works with gasoline, then you have probably had to deal with the problem of turning on the grass trimmer, as well as with such a problem as a gasoline trimmer does not gain momentum

That’s why this article was created.

So, what to do if your grass trimmer, which has been working for you for years, suddenly just stops picking up

, the engine simply stops working? In this case, you and I should consider a number of problems associated with stopping the motor.

The engine can stall under different circumstances. lawnmower does not develop revolutions, the reason. | Funnycat.TV. Sometimes the cause of incorrect operation of the grass trimmer, running on gasoline, is a clogged air filter.

It is the filter that is one of the most important reasons why the gasoline grass trimmer may stop working

It often receives a variety of debris, dust particles get there, which also clog the filter, so it needs to be cleaned and washed every month, and maybe more often, it all depends on how much power has a gasoline trimmer for the grass, and how often you use this device.

Why does a STIHL electric brush cutter not produce its full power output?

RPM problems can also occur when using an electric grass trimmer. The causes are completely different than with fuel-saving mowers.

You can solve the problem yourself

The electric grass trimmer does not develop the required power, because:

• the voltage in the network is below the required minimum for the device more than 10%;
• There was a failure in the soft start (if there is such a system);
• There is a problem with the brush unit;
• The motor winding has caught fire;
• Rotating parts sometimes get jammed.

If you want to get the voltage up and running again, you need to check the output first. If it does not meet the standards, you should increase it with a stabilizer.

The soft starter system can only be repaired at a service center.

brushes wear out and need to be replaced. When installing new ones, it is recommended to clean all surfaces with which they come into contact.

To adjust the voltage, you should first check the power.

If motor windings burn out, the electric motor must be replaced.

Jamming of the rotating parts can have various causes. To get rid of it, the entire drive unit has to be re-examined.

This last problem can also occur with another STIHL pruning shears and sharpening the blade on the shears is the solution.