Reasons for power loss in brushcutters. lawn mower does not develop full power
Anyone who owns a garden or a plot of land, is well aware of the problems of dealing with excessive vegetation. Now the grass trimmer has come to the rescue, which has successfully replaced the usual scythe in this field. This unit is very convenient in operation, but he, like any mechanism, because of the harsh working conditions or incorrect operation peculiar to fail. Situations when the grass 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 machine.
All grass trimmers are classified according to the type of power: gasoline or electricity (from the network or battery). It should be noted that gasoline mowers are superior to their electric and battery-powered counterparts in many respects. Despite the fact that they all perform similar functions, the difference in performance, maneuverability and efficiency is very noticeable. However, the general principle of operation of all types of manual mowers is almost the same. the devices are equipped with engines (two- or four-stroke engines or electric motors), which drive the cutting unit (spool with a fishing line or a metal disc). All elements are fixed on a straight or curved boom, including the handle to control the trimmer, which has the main buttons.
Since the problem of low RPM is more common in gasoline-powered trimmers, they will receive more attention. So, the lawnmower is very comfortable to work with and unpretentious in maintenance. In this case, most of its faults are caused by the lack of knowledge of the user of elementary things, which is written in the manual. That’s why you should carefully study the manufacturer’s manual before you start using the machine. In particular, to start the engine, you must do the following sequential steps:
- turn on the ignition button;
- Press the silicon button several times to pump the petrol;
- close the air damper;
- set the throttle lever in the high rpm position;
- first gently pull the starter grip to feel the engine resistance, then pull sharply.
if the lawnmower starts but stops, move the choke shutter to the intermediate position and try again. When the engine starts, you need to turn off the gas and open the air damper, as the grass trimmer works only on the suction.
Important! The operation of the grass trimmer depends on various environmental influences. The engine can be overheated in hot weather. When working in dense thickets or high vegetation, the engine also overheats heavily. Take a five minute break every 15-20 minutes.
What could go wrong?
Chainsaw malfunctions associated with this device not starting are classified in certain ways by service technicians. They stand out faults with the following parts of the mechanism:
- engine with worn or damaged pistons and bearings, cracked crankcase;
- the fuel supply system, with possible clogging of the filter or problems with the carburetor;
- mechanical damage to wires, pipes, hoses;
- the ignition chain.
To correctly determine the node where the breakdown occurred, you need to pay attention to the circumstances under which the grass trimmer stalls.
Troubleshooting trimmer for grass
grass trimmer is a convenient and affordable replacement for a lawn mower. Its cutting part is made in the form of a fishing line, knives or a disk installed on a drum, which is closed from above with a protective cover. The base of the design is a boom that is adjustable in height, with a convenient handle and shoulder strap at the end.
Like any other technique, the grass trimmer can break down unplanned, and in order for the breakdown not to lead to the final failure of the tool, we suggest you read this article. The unit can break for various reasons. Breakdowns occur with both new trimmers and those that have been in use for a long time.
Faulty electric models
Causes of sudden disconnection of the electric lawnmower are associated with a broken cord or a lack of current. In the first case, it is recommended to check the cable for breaks. To replace the power cord, you must pull the plug out of the socket, open and remove the switch cover.
Before unscrewing the cable clamping strip? You must remember the circuit of its connection to the switch. To disconnect the cord, use a hexagon (diameter 1 mm). The clamp is released, the conductors are removed. To check the cable for breakage, a multimeter is used. If necessary, a new cord is installed. In this case, the sequence is reversed.
In the second case, it is recommended to connect another appliance to the mains. Electrical apparatus may not work if the fuse in the plug is damaged. To carry out repair work, you will need to disassemble the fork. Use a screwdriver and a tester.
Motor malfunctions occur when the lawnmower overheats:
In the first case, it is recommended to wait a few minutes for the motor to cool down. In the second case it is necessary to remove the stuck object. The efficiency of the cooling system depends on the condition of the air filter.
A dirty device does not allow air to flow properly, which contributes to the machine shutting down. Experts advise cleaning and changing the filter once every 3 months (if the lawnmower is constantly used).
If the electric motor breaks down, there is a corresponding smell and noise. In this case it will be necessary to replace the drive.
Engine vibration at idle, on a cold or warm engine: possible causes
At a glance, the reasons for the appearance of the engine vibration are many, ranging from torn pads (supports) of the engine and ending with skipping ignition and troeniem the power unit. For a more accurate determination, you should first pay attention to one or the other symptoms.
The fact that vibration can be constant (regardless of warm-up and loads on the unit), and appear in a certain mode of operation (idle or high RPM, when cold or hot). engine vibration can manifest itself on a cold engine, but in the process of heating completely disappears. Let’s look into it.
- For example, if the engine has been recently disassembled for repair (possibly overhauled), then it is highly probable that after the reassembly the crankshaft was not properly balanced. The result is runout and increased vibration.
- We should also note that after the repair of the engine to the imbalance and vibrations can lead to different weight, which have parts of the cylinder and piston group. The greater the difference in weight, the more vibration will be. For this reason, experienced craftsmen weigh the pistons, pins, etc. before assembly.д.
- Often the cause of vibrations is that the engine is tripping, that is, one or more cylinders are not working or are malfunctioning for some reason. As a rule, the elimination of the cause of TNT automatically eliminates the presence of vibration of the power plant.
- Don’t forget that a misaligned timing belt or chain also causes vibrations.Timing is not stable due to imbalanced timing of the engine.
- Many engines have special balancer shafts in their design, which are needed to “dampen” the vibrations. It is quite obvious that problems with these shafts will lead to increased engine vibration.
Engine mounts are one of the most common causes of engine vibration. In fact, it is a damper made of rubber on many cars to absorb vibrations. As you know, over time rubber dries out and cracks, loses its properties as a result of technical liquids, etc.д. Most importantly, an engine with a damaged cushion cannot run smoothly.
- If you have recently moved from one car to another, you should take into account that different engines may differ in terms of vibration load. The number of cylinders, the layout, and a number of other features affect the level of vibration. In simple words, a normal inline 6-cylinder engine can operate with less vibration than a 4-cylinder or a 3-cylinder engine. In this case, we are not talking about malfunctions, since for a particular engine a certain level of vibration can be considered the norm.
- Also add, to reduce vibration, on the crankshaft of many engines is the so-called torsional vibration damper. If there are problems with the element, the motor will start to vibrate more.
As you can see, at the initial stage it is important to accurately determine the cause of increased vibration. For example, in most cases, it is sufficient to replace the engine mount or solve the problem of the engine tripping. However, it also happens that the power unit itself needs to be disassembled and repaired.
Repair of mechanical mowers is conducted at blunted or damaged cutting elements. In this case, experts recommend dismantling the removable knives themselves. Use an emery for sharpening. If necessary, the battery is replaced in the battery models.
Before repairing the lawnmower, the type of motor is determined:
Main. fuel mixture!
Suppose your grass trimmer does not start. In this case, the first thing to do is to check whether there is enough fuel in the tank, as well as to assess the quality of the fuel mixture. You have to fill your power tool only with high quality gasoline. It is recommended to use fuel, the brand of which is not lower than Ai-95.
Why the grass trimmer gasoline does not start? This can also be caused by improper preparation of the fuel mixture, which consists of oil and gasoline. The proportions in which the above components are combined, are specified by the manufacturers in the operating manual of the grass trimmer. Preparing the fuel mixture is highly discouraged in large quantities, that is, for the future.
Another common reason why the grass trimmer does not start is the presence of a clog in the filter area. To confirm the conjecture, it is enough to dismantle the specified block and try to start the unit without it. If the grass trimmer engine started, most likely you will have to replace the air filter or at least perform a thorough purge of the old one.
If there is abundant dirt on the surface of the filter element, you must use a new mesh. If you do this, do not leave the suction pipe completely unfiltered. That’s because rushing to do so may mean you need to repair the entire engine piston group for the machine.
In this case, the remnants of the plastic dissolved in the brutal environment make in the combustion chamber so awful that you can not do without a complete rebuild of the mechanism. Why does the weed trimmer stall when you step on the gas? Causes of grass trimmer stopping at high and idle speeds, heat or opening the air damper. But you will definitely always remember how to properly store fuel.
What, after all, to do when the fuel was exactly the same, the spark is, but the trimmer for grass gasoline does not start? Maybe you just filled the spark plug with gasoline. In this case it should be unscrewed, wiped with an untampered rag and dried. By the way, it is not unreasonable to check the spark plug itself for performance.
Adjusting the Husqvarna 128r Grass Trimmer Carburetor ~ WRCBUX.RU
Self-adjustment of the lawnmower carburetor with their own hands is impossible without preliminary work, knowledge of the theory, awareness of the device of the fuel system. Annotation on how to repair the carburetor.
Lawn mowers, like all petrol garden tools, are not difficult to maintain. Repair, tune without the help of others can and must. For example, the adjustment of the carburetor lawnmower with his hands. a matter of 5 minutes.
The carburetor from the lawnmower is a node in the power system. In it, as well as all carburetors, there is a process of mixing air and fuel (gasoline) for the upcoming submission to the engine cylinders.
In this process, the main thing. the correct proportion of fuel and air, and why adjust the carburetor.
The main problems and malfunctions of the carburetor.
Strainer. There are two problems with this element more often than not:
To find out the cause of the failure, unscrew the fuel filter cover to remove the strainer. If it’s just a buildup of dirt, flushing it with gasoline or blowing it out can help.
If the strainer is visibly damaged, it is imperative to replace it with a new one. There may also be damage to the fuel supply pipe (when repairing it is practiced to check this element).
The carburetor starter almost always fails due to clogs. You should use acetone or the same gasoline to flush it.
Blowing out clogged carburetor parts with compressed air is an acceptable and comfortable repair practice.
Throttle body, carburetor component bundles and inlet or outlet line are all prone to leakage. You can probably check it by a simple method. spread soapy foam on the problem area.
What to do if the lawnmower or saw stalls at high rpm (under load)
Gardening Equipment Repair Group Video on the causes of sudden stopping of the two-stroke.
Mower won’t start when hot. pull the throttle trigger and yank the cord sharply several times until the engine starts, then put the trigger down. Does not start. requires specialized repairs.
Check the ignition system, if the lawnmower does not start, is carried out sequentially:
- clean the removed spark plug from soot and dirt, dry it, set the gap of 1 mm;
- connect to the high-voltage wire and check for sparks by yanking the starter a few times;
- If there is no spark, check for continuity of the high-voltage wire;
- replace the spark plug;
- Dry the spark plug duct;
- at the same time check the operation of the ignition coil, it is defective, if the working spark plug does not spark.
It is in case of malfunction of the ignition coil that the lawnmower does not start when hot, it stops, or works intermittently.
Cleaning or replacing the air and fuel filter will ensure the necessary flow of ingredients into the carburetor. the air filter can be washed in soapy water or replaced. If nylon cloth is used, wash it, replace the porous felt filler. Why does the lawnmower stalls when you press the gas: the causes and their solutions. The lawnmower (grass trimmer) stalls: Change the fuel filter carefully, without leaving the intake pipe open. Whether you need to replace the air filter, you can determine if the engine with the removed air cleaner starts. Do you need to change the grid on the fuel supply if the lawnmower won’t start, a dry spark plug will tell you.
The breather, the air inlet in the gas tank. If it gets clogged, it creates a vacuum in the tank and the mixture does not flow to the carburetor. The hole can be blown with air or cleaned with a needle. Clean the exhaust duct, remove the muffler mesh.
When stepping on the gas
If the lawnmower stops when you press the gas, the following conditions may be present.
- A more common variant. it is a failure of the carburetor adjustment, which appears at significant loads on the drive, after prolonged inactivity of the mechanism or when using it in harsh conditions.
If the problem is related to the carburettor unit, it can be recognized by the appearance of vibrations of the lawnmower. When the hose or rope is bursting or cracking, these components must be replaced.
When using a trimmer for grass, which has an electric motor, problems with the speed also occur. But they are caused by a different type of problem compared to the fuel-powered mowers. The electric motor doesn’t develop the necessary rotation speed in such cases
- If the voltage available on the mains supply is more than 10% lower than the nominal voltage of the electric motor;
- if there is a problem with the soft-start system (if this unit is installed);
- When there are problems with the brush unit;
To rule out a voltage problem, you need a multimeter or a tester to check its value in the socket from which the electric mower is powered. If it is less than the minimum allowable value, then to increase it will need to turn off all appliances or install a stabilizer.
To repair the soft starter you need a good knowledge of electronics, so it is better to contact a service center. There to determine if it can be repaired or if it must be replaced. You can independently check the button or find a diagram of the block and try to figure it out.
The brushes can wear out and may lose contact, causing the motor to stop. Brushes can be replaced easily. The process depends on the model of brushcutter used. By the way you also need to clean all the contact surfaces.
If the winding is on fire, if you keep mowing grass or brush, the motor will quickly burn out. It will be accompanied by a smell of burning up to the melting of individual parts. The electric motor will need to be replaced.
Rotating parts become jammed for various reasons. To identify and fix it, you will need to rebuild the drive unit. There are models in which the number of revolutions is automatically adjusted depending on the load, increasing as the load increases. their idle speed is reduced.
Where to look for the cause or where to start checking
All chainsaws have the same design and work according to the same principle. How a chainsaw works can be found in this article. No matter what brand. STIHL, Husqvarna, ECHO, Champion, Partner, Sturm, etc. The problem, when a chainsaw malfunctions when you press the gas, can occur the same way with expensive and high-quality tools as with low-priced Chinese devices. If there’s a problem, take care of it.
A chainsaw is a system of mechanisms made up of parts. Every part in the mechanism can fail, causing partial or complete failure. If the engine of the tool starts, it does not mean that the chainsaw is fully operational. If the engine stops when you raise the rpm, there is a good reason for it. When this malfunction, you should pay attention first to a number of the following mechanisms of the tool:
- Gas tank. make sure there is fuel. If there is a sufficient amount of fuel, you should also check the serviceability of the fuel filter, check the connection of the supply hose to the carburetor, as well as to ensure that the breather valve is working
These are the main parts and mechanisms that should be checked first, if a malfunction occurs when the chainsaw stalls when the gas pedal is pressed. There are other reasons why the chainsaw engine stalls when the throttle trigger is pressed. What else can contribute to this malfunction, as well as the peculiarities of troubleshooting, let’s find out below.