DIY sterwins trimmer repair

Modern technologies and equipment make it possible to produce the best and optimal technical solutions that become effective assistants in the arrangement of a summer cottage or a personal plot. The green lawn and other plantings can grow rapidly, a petrol cutter is used to tidy up the local area and mow the lawns, which is also called a brushcutter or trimmer, a petrol mower.

Traditional braids are inconvenient and unsafe to use, require a significant investment of time and effort, which will help save gas mowers, combining functionality and practicality in their design. In the photo of the petrol brush, you can see various high-tech devices, which are inherent in a set of operational characteristics, including such parameters as increased productivity and a long service life.

A convenient and reliable trimmer is a technical device consisting of individual mechanisms, parts and elements that can wear out, become unusable and damaged during intensive use.

Even with regular technical inspection, maintenance procedures and careful storage, such devices and their individual parts require repair and even replacement, all repair procedures can be performed independently.

Brief content of the article:

The easiest way is to give the petrol cutter for repairs, having allocated a certain amount of funds from the family budget, prompt and high-quality repair with your own hands is no less simple and convenient if you want to understand the design of the petrol cutter and fix all the problems.

The mass and piece production of trimmers is based on the use of generally accepted technology, a typical design scheme consists of certain elements and parts, it is important to know them when carrying out independent repair work:

• top part. The basis of the entire structure, where all important elements are collected, such as a starter, a carburetor and a petrol cutter engine;
• middle part. A hollow rod, inside it is a cable that connects the motor and the gearbox, which drives the cutting line. In this part there are fasteners for distributing the weight of the entire structure and a belt for fixing the trimmer on the belt of a person using the trimmer for its intended purpose;
• Bottom part. It houses the gearbox and cutting elements, which are hidden under a practical cover to protect the user. The casing provides an increased level of safety, preventing large fractions of debris, stones and glass from entering a person while working with a petrol cutter.

Knowing exactly the internal structure and the principle of operation of the trimmer, you can independently carry out repair measures for the structure or replace individual components that have become unusable, using the repair instructions.

The most common and common failures of the unit that need to be corrected on their own include the following problems:

• engine malfunction, due to which the brushcutter does not start and does not work;
• increased vibration of the brushcutter bar, which complicates its intended use;
• increased overheating of the gearbox, its accelerated heating during operation;
• slow and weak functioning of the cutting line at insufficient speed;
• clogging of the starter grille, causing overheating of the engine and its refusal to work;
• fast and frequent clogging of the carburetor due to the use of low-quality fuel;
• clogging of the air filter due to non-observance of the measures for the care of the device.

All these problems can lead to the fact that the device will lose its working capacity. Before ordering the necessary spare parts for the mowing, a visual inspection and diagnostics of the device should be carried out.

Particular attention should be paid to individual spare parts and units of the device, to check them you do not have to contact a professional master, a set of diagnostic measures will help you to identify the consequence of a loss of performance with your own hands.

If the trimmer motor does not start or stalls immediately after starting, when the gearbox overheats or during the operation of the device, extraneous noises are heard and vibration is clearly felt, it is important to visually inspect and identify a non-working unit.

To optimize the preparatory measures before repairs, you should carry out a simple diagnosis and check step by step:

• the presence of fuel in the tank and lubrication in the main units;
• serviceability of the spark plug and its performance;
• the cleanliness of the fuel and air filter of the brushcutter;
• clogging of the outlet channel and breather of the device;
• the quality of the fuels and lubricants used.

To determine the functional efficiency of the petrol-cutter's ignition, it is necessary to determine whether the spark plug is working by testing the appearance of a spark when it comes into contact with the body of the functional device.

The spark plug itself can be replaced with a new one, having previously dried the candle channel, if necessary, the old element is also dried, cleaned with special devices and returned to its place.

In the process of inspecting the carburetor, it is worth paying attention to the possible leakage of the fuel used; to identify problems with the carburetor, the following measures must be taken:

• purging the fuel hose to eliminate possible blockage of the element;
• checking and replacing the gasket between the engine and the carburetor;
• determination of tightness and maintenance of constant pressure in the unit.

If necessary, you can personally disassemble and thoroughly clean the unit using gasoline, the jet and channels are cleaned using compressed air.

The gearbox transmits torque from the motor shaft to the cutting tool, its gears during operation must be absolutely clean and always lubricated with special grease.

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Carrying out a technical inspection on your own once a season will allow you to get rid of the need to repair the gearbox or replace it, with the purchase of an expensive new unit.

The starter is necessary to bring the trimmer into working condition, its diagnostics consists in checking the tension of the starter cord connected to the teeth of the starter coil, which are often destroyed during an abrupt start.

An inoperative starter in a petrol cutter cannot be repaired; it must be replaced with a working unit as part of a mandatory technical inspection or a set of repair measures.

Cutting elements require special attention and care, which must always be cleaned of dirt and cut grass after use. Regular inspection and thorough preparation of the device for operation will help to avoid costly and time-consuming repairs, and always be confident in the performance of the petrol brush.

An indispensable tool for a modern summer resident or owner of a private house is a petrol cutter, which allows you to effectively and efficiently put the adjacent territory in order. The period of active use of brushcutters is in late spring until October. Modern units are equipped with powerful and durable internal combustion engines, reinforced transmission and main components. Despite this, physical wear, manufacturing defects or improper operation lead to failure of the trimmer. In order to repair the trimmer with your own hands, you must have at least basic knowledge in the field of technology and little experience in repairing it.

The main unit of any gasoline tool is the internal combustion engine (ICE), which, through various methods, transmits torque to the actuator. In a modern petrol cutter, a duralumin rod (pipe) is used as a transmission element between the engine and the trimmer head, inside which the drive shaft is located.

Thanks to the high-revving engine, the line speed can reach 13 thousand revolutions per minute, depending on the manufacturer of the scythe. In order to exclude mechanical and thermal damage to the gearbox, a special hole is provided in its housing for the introduction of grease in the form of ointments. To make the headset easier for the owner during long-term work, all brushcutter models are equipped with a durable shoulder strap.

Regardless of the manufacturer, almost every model comes with a line and steel knives.

The cross-section of PVC trimmer line can vary from 1.5mm to 3.0mm.

Made of durable polymer, it is subject to intense wear and tear during mowing. Therefore, from time to time it is necessary to check the presence of a fishing line in the head and, if necessary, replace it. It is recommended that you purchase an extra bobbin to quickly replace it with a spool with no line.

ICE trimmers on the market today are equipped with a D-shaped, U-shaped or T-shaped handle, where the main controls of the unit are located. For example, in a braid with a U-grip, the throttle key and stop / start toggle switch are located on the right grip. In the D-shaped version of the handle, the throttle control button is located directly on the rod.

Due to the presence of many components and parts, repairing a trimmer with your own hands means eliminating breakdowns that prevent its normal operation. It should be noted the most basic malfunctions of gasoline streamers:

1. The trimmer motor is not picking up speed;
2. Breakdown of the cylinder-piston group (CPG);
3. Ignition malfunctions;
4. There is no connection between the internal combustion engine and the trimmer head;
5. Mechanical knocking during unit operation.
6. Repair of the central piston group petrol cutters

The main unit of any internal combustion engine is the cylinder-piston group (CPG), which can fail due to wear of parts of parts or poor quality of the fuel mixture.

Lubrication of rubbing units in a petrol cutter is carried out by adding a certain proportion of oil to gasoline. This process can be disrupted due to old oil precipitating out. In this situation, when the trimmer is started, the motor overheats and in a matter of minutes the most expensive breakdown occurs. To eliminate the malfunction that has arisen, a complete replacement of the CPG will be required, namely: the piston, oil seals, cylinder and piston rings. If you are not an ICE repair technician and do not have experience working with technicians, then you will hardly be able to fix the engine without the help of a specialist. Details on the stages of piston trimmer repair can be found here.

If the ignition of the petrol mowers fails, the spark on the candle disappears and, as a result, the fuel mixture does not ignite.

Spit spark plug design

In this situation, it is quite important not to rush to replace the coil, since the cause of the breakdown may lie in the lack of contact in the switch on the control handle.

An important point when troubleshooting the trimmer ignition will be the diagnostics of the section, where the distance between the side and center electrodes should be 0.5-0.7 mm. In addition, it is necessary to pay attention to the steel O-ring on the spark plug, the loss of integrity or deformation of which can lead to etching of air from the combustion chamber and, as a result, reduce the power of the streamer.

Ignition flywheel with coil

If the replacement of the check of the electrical circuit, the spark plug and its contacts did not give positive results, then you should pay attention to the trimmer ignition module, namely the clearance with the flywheel. Regardless of the design features and the manufacturer of the brushcutter, the distance between the ignition coil and the flywheel should be no more and no less than 0.2 mm. To restore the optimal value of the gap, you will need to loosen the coil mounting bolts and set the trimmer ignition with a special measuring probe.

A clear sign of a malfunction of the engine power system is the absence of traces of the fuel mixture on the spark plug electrodes, which may be associated with the following defects:

Trimmer Fuel System Components

• due to a clogged hole in the gas tank, a vacuum is created, which prevents the normal flow of gasoline into the carburetor;
• due to the poor quality of the fuel and the ingress of foreign particles, the fuel filter installed in the tank is clogged;
• non-flow of the mixture into the combustion chamber as a result of a clogged carburetor.

You can quickly determine the cause of the malfunction by dismantling the fuel hose leading to the carburetor. If the fuel mixture flows out in a thin stream, then you should pay attention to the carburetor. If there is no jet, it is necessary to clean the breather with a thin needle (a small hole in the gas tank cap) or replace the fuel filter.

If fuel enters the carburetor, it must be cleaned or adjusted. Adjusting the carburetor trimmer means restoring optimal fuel mix.

Trimmer carburetor with adjustment screws

To do this, pay attention to three adjusting screws: maximum speed (H), minimum (L) and idle speed (LA). To start the adjustment, you need to fully tighten the screws H and L and loosen one turn each. Then we start the braid and let it warm up for 10 minutes to adjust the power system in operating mode. After warming up the internal combustion engine, press the gas supply button until it stops (12,000 rpm). We restore the idling mode by unscrewing the screw LA. As soon as the trimmer head starts rotating, tighten the screw until it stops.

One of the common faults of the petrol mowers is the incorrect operation of the internal combustion engine, namely the drop in power with increasing speed (the scythe stalls).

The reason for this is that the exhaust system is clogged with burnt oil particles. Often manufacturers make mufflers prefabricated and cleaning is quite simple. If the design of the spark arrester is non-separable, then it must be placed in water with detergents, and then dried with an ordinary or industrial hair dryer. Frequent clogging of the exhaust system indicates non-observance of the proportions of oil and gasoline.

The use of various electrical devices greatly simplifies the performance of many types of work, but unfortunately, all complex products break down sooner or later. Failure of the electric trimmer

will lead not only to the inability to carry out work in the garden, but also to significant financial waste on repairs. It is possible to significantly save money and increase your own knowledge of the device of this technique if you do the trimmer repair yourself. Before proceeding with this type of work, you should carefully study the principle of operation of this type of household appliances.

The electric trimmer consists of:

• Enclosures with an electric motor.
• Detachable rod.
• Trimmer reel with protective cover.
• Shoulder strap rivets.

Electric trimmer device

A power cable with a plug is connected to the trimmer body, through which electric current is transmitted. In the cavity of the split rod there is a flexible shaft, thanks to which the torque is transmitted to the trimmer coil. The device is turned on by pressing the button located on the handle of the device.

This trimmer design is the most common, but

if desired, you can find products that operate on a battery, as well as with a lower location of an electric motor.

The trimmer can be damaged when working under increased stress. This situation can arise when the cultivated area is overgrown with tall grass.

When working in such areas, the engine may fail, the bearings may break, and the coil of the electric scythe will collapse. When operating in rainy or very foggy conditions, the trimmer may “burn out” as a result of a short circuit.

Damage to this electrical appliance can also occur as a result of frequent use. If the household appliance is used in this mode, then after operating a certain number of operating hours, it will be necessary to carry out mandatory repairs and preventive adjustment of many parts of the electrical appliance.

If the electric scythe does not show signs of life, then there may be a break in the electric cable inside the handle of the case, or the button for turning on the electric motor is faulty.

In order to diagnose an electrician, you will need to disassemble the handle of the electrical appliance. The work is carried out in the following sequence:

• The control handle is removed from the electric scythe frame.
• The handle is disassembled.

When access to the inside of the electric trimmer is provided, the resistance of the electric trimmer button is measured using a multimeter. If there is no resistance after pressing, then this

the part is subject to mandatory replacement. It is also necessary to check the connection points of the power cable with the internal electrics located in the handle.

device. The contacts should be checked for open circuit with a multimeter. Often, such a malfunction can be determined "by eye". After detecting an open contact, it is enough to solder the damaged area to restore the operation of the electric trimmer.

In the absence of a multimeter, diagnostic work can be performed with an indicator screwdriver. For this purpose, connect the plug to the mains and using this diagnostic tool

find the "phase wire" and thus check the presence of electric current before and after the power button. If the phase current is detected in another electrical circuit, then it is enough to install the electrical plug on the contrary in the outlet so that correct diagnostics can be carried out

trimmer malfunction. The second diagnostic option should be done with great care, since there is a danger of electric shock when checking the integrity of the wiring.

If the power button of the device and the sections of the internal wiring are intact, then you should start checking the electric motor. For this purpose, it is necessary to remove the housing cover, having previously unscrewed several screws with a screwdriver.

The first thing to do after accessing the electric motor is to check that the brush assembly is working properly. If the brushes are worn out above the maximum permissible value, then the electric motor may stop completely or work unstable. In the case when the brushes and the collector are in perfect order, you should start “ringing” the motor winding. In order to eliminate the likelihood of breakage in both circuits, you should alternately carry out

checking the stator and rotor of the motor. To perform this operation, you must:

• Remove the engine from the electric scythe.
• Switch on the multimeter in resistance measurement mode and check all collector plates for breakage. When checking, there should also be no significant deviations in the readings of the diagnostic tool.
• Check for breakdown of the rotor winding to ground. For this purpose, connect one probe of the multimeter to the rotor “ground”, and the other to any collector plate. The multimeter must be set to measure resistance over 1 MΩ. The resistance of a working motor between the winding and “ground” should be very high.
• Measure the resistance value of the stator winding. If there is no resistance, then we can state in this case its malfunction.
• If the stator wiring is in perfect order, then a check is made for a possible breakdown on the case, in the same way as when diagnosing the stator.

When checking in this way, it is possible in 90% of cases to establish the cause of the malfunction of the electric motor. To check for an inter-turn circuit, which can manifest itself only during the operation of the engine, thus it will not work, but such a malfunction can be diagnosed

by indirect signs, which are manifested in a decrease in the power of the electric motor and its overheating. If the electric motor is equipped with a thermal relay, then such an electric scythe, with an interturn closure, will work for a short time, after which the trimmer will automatically turn off. In some cases, the thermal relay can cause a malfunction of the trimmer motor, therefore, in a set of test

measures should be included "ringing" of the thermal relay using a multimeter or tester.

It is very simple to do this: in good condition, on a cold engine, the thermal relay passes an electric current,

In a malfunctioning state, the electrical circuit will be open.

Problems with the performance of electric scythes associated with wire breaks can be easily eliminated by soldering the contacts, but if the motor is "burned out", then you will need to perform a complex rewinding process, which can

carried out by a qualified technician only. In many cases, it is much easier and cheaper to purchase a new engine and install it in place of the burned out one. This work can be done independently

in the reverse order of removal of the unit.

If the trimmer electrician is in good working order, then you should pay attention to other types of malfunctions that may appear during the operation of the electric trimmer.

If the electric motor of the device turns on, but the reel with the line does not rotate, the causes of such a malfunction may be a break in the flexible shaft transmitting torque. This problem is especially often manifested with improper care of the electrical appliance. For example, in the absence of lubrication inside the rod of the electric cable, the cable will be exposed to excessive friction and within a short time this part will fail. For replacement, it is enough to disconnect the upper part of the electric braid, in which the electric motor is located, after which it will be possible to remove the flexible shaft from the rod.

If there are difficulties with the removal of the second part of the cable remaining in the cavity, the lower part of the spit is disconnected with the bobbin and shaft. The assembly of the mechanism is carried out in the reverse order.

Bottom trimmer

The flexible shaft must be thoroughly lubricated with grease prior to installation to reduce the chance of repeated failure of this part.

Electric scythe shaft bearing

Flexible shaft rupture can only occur on top-engine electric trimmer models.

Electric scythes with a lower engine location do not have a flexible shaft, but malfunctions of such devices can manifest themselves in the form of destruction of the bearing of the main shaft of the electric scythes on which the bobbin with fishing line is installed.

To fix such a malfunction is very simple, it is enough to replace the failed bearing with a new part.

With frequent use and improper care of the electric scythe, the listed malfunctions can appear with enviable regularity. To minimize the likelihood of breakage, it is enough not to overload the device, lubricate rubbing parts in time and do not work in high humidity. Despite some restrictions when working with this device with an electric trimmer, unlike petrol trimmers, there can be no malfunctions in the ignition unit. And such a malfunction as: "the trimmer motor immediately stalls", in principle, can not be.The motor of the electrical device cannot stall because it does not need to be started. To start, just press the power button, so many summer residents choose electric trimmers to care for the surrounding area.

Any complex technical equipment has a limited working life. And with an increase in the intensity of its operation, the risk of its failure increases. However, it is within the power of each owner to reduce the number of such emergencies if the rules for use and maintenance recommended by the manufacturer are followed exactly. In any case, you should be prepared for the fact that at a certain period, malfunctions in the operation of the device will still arise. Malfunctions that can occur in the trimmer operation can be of a different nature. However, in some cases it is quite possible to repair the trimmer on your own.

Equipment that operates on mains differs from similar devices that provide a built-in power drive in that it has a simpler design. The main components of a trimmer are:

• mechanical part that transmits torque to the trimmer head;
• electric motor;
• power cable.

In this case, all the problems that may arise with this equipment can be presented in the form of the following groups.

Main function when using the device assigned to the trimmer head, in which the cutting surface is made of fishing line. In most cases, the device fails due to problems with its supply.

• In case of using up the supply of fishing line, it is necessary, following the instructions of the instructions, to wind a new one.
• Line entanglement may be one reason for work stoppages. In a similar situation you need to unwind it and insert a new bobbin if it shows signs of damage.
• Also, the trimmer may fail due to stuck nylon thread, which may be due to overheating of the device during its long-term use. This problem is solved by rewinding the line.
• Malfunctions can be directly related to the coil: for example, the bottom of it may fall off. Repair in this case will be reduced to replacing it or creating a new bottom with your own hands. Having chosen the last option, it is necessary to prepare a piece of PCB or a bolt with a nut.
• In some cases, the coil may not show signs of damage, the motor may also be fine, but the head does not rotate. In a similar situation, you should look at the drive shaft. If the fear of its breakage is confirmed, then the device must be handed over to a service center.

If the failure of the gasoline trimmer is associated with malfunctions in the mechanical part, then the repair technology will for the most part repeat the work carried out in relation to electric models.

To carry out repairs to electric trimmers, you must prepare the appropriate tools:

• indicator screwdriver;
• multimeter;
• blowtorch.

It is rather difficult to find out by visual inspection what caused the malfunction; in most cases, only the most obvious malfunctions can be identified by eye.

Regardless of the nature of the malfunction, this in any case leads to the termination of the engine.