How to assemble an electric grass trimmer

grass trimmer. Types and device. Work and how to choose. Safety

Garden equipment about, which will be discussed, consists of four main elements: the engine (electric or gasoline), a long boom, control handles, cutting head. Due to differences in translation, these devices often appear under different names: grass trimmer, grass mower, lawn mower, electric lawn mower, electric mower, haymower and even lawn mower. This creates confusion. Lawn mower. a device for lawn care, the main purpose. to maintain a neat appearance of the lawn.

The term electric lawnmower contains references to two types of engines at once. gasoline and electric, which is also not quite right. In fact, it is more logical to call all types of grass trimmers, which are divided into electric (electric mowers), gasoline (brush mowers or lawn mowers) and cordless.

There should also be no misconception that the grass trimmer is a tool for creating a decorative lawn. To mow the area inaccessible to the lawnmower grass trimmer can. In this case, evenly mow the lawn with the grass trimmer is unlikely to. The lawn processed in this way will be inferior in appearance to the result of work with a wheeled mower. But it is easy and pleasant to mow thickets of weeds with a trimmer.

Technique of work with a fishing line and a disc

Technique of the trimmer with a string and disk has some differences. So, a line for a trimmer cuts the grass at the very end, but if you move too fast, the entire length is used. The result is that the blades of grass are not cut, but the grass is wound up around the filament, and the motor is overloaded. That’s why it’s important to choose the best cutting speed. In addition, the trimmer line is quicker to use when mowing tall, tough grass than when mowing lawns.

A side note! If you have to mow a hillside, the top of the hill should always be on the right. It is necessary to rise gradually to a distance equal to the width of the span.

There are a few simple recommendations, the implementation of which will make the mowing more effective and efficient.

• A bottom-mounted trimmer is handy for mowing garden paths, flowerbeds, and edges of lawns. The plane of rotation of the coil of such a device can be placed perpendicular to the ground.
• Dense thickets, large weeds, bushes need to be mowed with discs or special attachments.
• When cleaning large areas, the device should be tilted to the left, in the direction of swing.
• To mow the grass around flower beds, shrubs and other objects, you should turn the grass trimmer head with the hood towards them. In this way you can mow the objects themselves without damaging them.

Remember that the bobbin or disc must not touch the ground or any obstacle other than grass or branches to be cut.

Electric grass trimmer

Electric trimmer for grass (tape) consists of a long rod with an electric motor attached to it and a clamping mechanism (working head). The cutting tool of a grass trimmer is a special line for the trimmer (cord). During operation (with rapid rotation), the cord, stretching into a very stiff thread, moves across the lawn at a speed of about 175 m / s.

The grass trimmer is often used for secondary treatment of the lawn, that is, to work in places where a standard lawnmower will not pass. With the grass trimmer you can carefully trim the grass near trees, near curbs, fences, flower beds and shrubs. Grass trimmer is almost insensitive to various surface irregularities, so it is easy to treat areas that have the most difficult terrain.

Checking the electric motor

If the trigger and internal wiring are undamaged, proceed to check the electric motor. For this purpose it is necessary to remove the cover of the case, having previously unscrewed some screws with a screwdriver.

The first thing to do after accessing the electric motor is to check that the brush assembly is working. If the brushes are worn beyond the limit value, the motor may stop completely or work unstably. If the brushes and the collector are fine, proceed to “test” the motor winding. To avoid a breakdown in both circuits, carry out the following checks one after the other

Check motor stator and rotor. To perform this operation it is necessary to:

• Remove the motor from the brushcutter.
• Switch on the multimeter in resistance measurement mode and check all the collector plates for breakage. Also during this check there must not be any significant deviations in the readings of the diagnostic unit.
• Perform a ground fault test of the rotor winding. For this purpose, connect one probe of the multimeter to the rotor “ground” and the other to any collector plate. The multimeter should be set to measure resistance greater than 1 megohm. The resistance between the winding and the “ground” must be very high if the motor is in good condition.
• Measure the stator winding resistance value. If there is no resistance, it can be declared a fault.
• If the stator cables are perfectly all right, they are checked for a possible ground fault in the same way as for the stator.

When you check the motor in this way, you can find the cause in 90% of cases. It is not possible to check for inter-turn faults, which can only occur during operation of the motor, but such faults can be diagnosed in this way

The indirect signs, which are manifested by 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 mower, with an intercircuit failure, will work for a short time, after which it will automatically turn off the trimmer for grass. In some cases, the thermostat can cause malfunction of the electric motor trimmer for grass, so in the complex of checkup

The activities should include “testing” the thermoelectric relay with a multimeter or tester.

To do it is very simple: in a good condition on a cold motor, the thermostat passes the electric current, in the

In a faulty state, the electric circuit will be open.

Mower performance problems associated with broken wires can easily be solved by soldering the contacts, but if the motor “burned out”, you will need to perform a complex process of rewinding, which can

perform it only by a qualified technician. In many cases, it is much easier and cheaper to buy a new motor and install it in place of the burnt out one. This work can be done independently

If the grass trimmer’s electrical system is in good working order, you should pay attention to other types of faults, which can occur during the operation of the electric mower.

Making a grass trimmer out of a drill yourself

One of the easiest ways to make a grass trimmer is to use an old drill or a cordless electric screwdriver. The second option is a little worse, because the battery will significantly limit the operating time. But you can increase autonomy by installing a 12-volt car battery in the design. However, given the large size of this power cell, you will either have to take care of long wires, or make the entire device a wheeled.

So, to make a grass trimmer from a drill, you will need a sturdy holder, the power tool itself and a homemade knife. The process involves several steps.

• Making a holder. It can be wooden or metal, but many recommend finding an aluminum tube, which is light and lightweight and yet highly reliable. In addition, it can be easily drilled if the grass trimmer will not be dismantled in the future and the drill will be fixed firmly.
• Attachment to the holder of the drill (or electric screwdriver). This is done by means of metal brackets or clamps. Some home handymen claim that you can attach the tool with regular tape, but there are a few nuances here. First, this is not safe. Secondly, it is impossible to give the desired angle between the holder and the working mechanism with scotch tape, which means that it would be extremely inconvenient to use such an assembly.
• Attaching to the holder of the power cable. This is done with tape so that the wire does not hang and does not interfere with the work.
• Another important design point is the knife. It can be made of steel. It should be thin for ease of use. And if the grass trimmer is assembled from a battery-powered electric screwdriver, then the material should be chosen lightweight. this will allow you to “squeeze” the maximum operating time from the battery. Next, the selected metal strip, sharpened on both sides, drilled in the middle and tightly fixed to both edges of the bolt, which in turn will be fixed in the chuck of the drill.
• For safety at work, you should be concerned about the protective cover, which can be made of plastic. A great option is to use the top part from a 19 liter plastic bottle.

Grass trimmer from the angle grinder

Another simple and convenient option. to make an electric garden trimmer for grass from an angle grinder. In general, the scheme of assembly is similar to the previous method, but with the difference that fixing the power tool to the holder even easier. If you remove the protective cover from the angle grinder, you can screw a self-welded U-shaped fastener into this thread. Fasten it to the holder can be by means of bolts or welding, if in the future it is not planned to disassemble the homemade trimmer for grass. Some craftsmen weld a protective cover to the fastener at once.

Motor

In electric trimmers, the engine power usually does not exceed 1.3 kW, and therefore, in comparison, for example, with gasoline units, they can be called low-power. However, they have several advantages.

Weight of electric trimmers is much less than that of gasoline “brothers.

They are easy to use, virtually noiseless, environmentally friendly, and start at the touch of a button, besides, they do not need oil and gasoline.

Electric grass trimmers are available in two types:

Electric grass trimmer: device and principle of operation

The body of the grass trimmer is connected to a power cable with a plug, which is used to transmit the electric current. There is a flexible shaft in the cavity of the split rod, which provides torque transmission to the trimmer spool. The device is turned on by pressing the button on the handle of the device.

This grass trimmer design is the most common, but

If you wish, you can find products working on battery power, as well as with the bottom-mounted electric motor.

The design of the electric grass trimmer boom. Design features

It should be noted. That the cutting head for the grass trimmer contains special arrows. They allow the coil to rotate in different directions. An electric grass trimmer consists of a boom, a good electric grass trimmer will last. If it became necessary to wind the line for the trimmer to the side of the shaft rotation, it rotates to a specific position. A large number of wound cord threatens to break the equipment. Two arrows are contained only on imported models. Now there are heads with one arrow on the market.

If the cord is not wound after hitting the semiautomatic head, then the previous winding was not done correctly. That is, after the grass trimmer head has been installed, the user has not pulled the ends of the line from the grooves. Another unpleasant thing when mowing grass may be the sintering of the spool turns.

Why this happens? This occurs when the filament meets a hard object. At the same time, it brakes sharply and during the subsequent movement of the line for the trimmer begins to go inside the device. The filament thereby enters the bobbin and clumps together. Because of this the worker has to take a break and correct the situation. This can, however, be prevented. Before installing the spool, it is necessary to treat the line for the trimmer with a special silicone substance.

For different models of trimmers use a semi-automatic head, which consists of two parts. the body and the bobbin. Both elements contain springs. The second part can be performed in several variants:

• One-section lines. both parts of the line are wound together;
• two-sectional. each end is wound on a certain part; this type is the most effective, because the line for the trimmer does not get tangled and does not sinter.

There is a simple, inexpensive way to turn a one-section bobbin into a two-section bobbin. For this you will need a solid plate. From it you need to cut a circle, the diameter of which should be equal to the thickness of the bobbin. In this case, the thickness is taken near the place where the line for the trimmer is wound. This circle moves freely. Next, a cut is made on the ring, put on the bobbin and connected by means of glue or tape.

As a result, you can wind the line for the trimmer on the necessary section. The universal grass trimmer head can have two to four holes that face each other. The mowing ends come out of them. In addition to the presented reels, there are heads, where a certain size of fishing line is inserted. In this case, the number of whiskers is increased to twelve. Many users believe that such a device is quite convenient. However, not all people hold this opinion.

They believe that in this situation, more fishing line will have to be consumed. over, to change it, you need to stop working. Electric grass trimmer. An electric grass trimmer consists of an electric motor, a handle. Grass trimmer head, the caliber of which can be varied, is suitable for cutting grass, shrubs and trees. Before you buy a grass trimmer. It is necessary to study the terrain, as well as the features of the equipment. So, we found out what the universal grass trimmer head is for and how to refuel it properly.

Grass trimmer reel device

Grass trimmer mower heads are available in many designs. Both simple and complex. The picture below shows a semi-automatic trimmer head from the mower disassembled Husqvarna (Husqvarna).

This type of head is present in the configuration of most gas mowers and electric trimmers such as STIHL (Stihl), Patriot (Patriot), Champion (Champion), Bosch (Bosch), Huter (Huter) and others. The mower head is quite simple. It consists of the following parts:

• Mowing the base of the head;
• The button for the semi-automatic cord feed;
• A spool (reel) that is filled with fishing line;
• Spring;
• Eyes. The line for the trimmer comes out through them;
• Grass trimmer head cover;
• trimmer line (cord).

The following photo also shows simpler grass trimmer heads.

All these nozzles do not allow you to change the length of the mowing line in semi-automatic mode (after pressing a button). If the cord breaks, the mower must be stopped and replaced manually.

Technical features trimmers

Popular lawnmowers and electric trimmers have significant differences not only in terms of the engine, but also structurally, and therefore. they are characterized by different faults. However, it is not uncommon to experience breakdowns of common elements to all hand-held mowers, such as the cutting unit. In any case, in order to correctly diagnose and repair problems, it is necessary to understand the circuitry of both types of garden tools.

Lawn trimmer gasoline group

All constructional elements of chain saws are shown in the drawing below.

The engine in the considered type of garden tools can be single-cylinder 2 or 4-stroke. In the first case, the work requires a fuel mixture consisting of gasoline (only AI-92) and oil, and in the second. fuel and lubricant are poured into different reservoirs. The power of a brushcutter ranges from 500 W to 3300 W. Machines weigh from 3 to 9 kg, but on average about 5 kg.

Electric group of garden mowers

Electric trimmers are arranged much simpler. They are lighter but less powerful (550-1000 W). Their constructive device is shown in the figure.

To work such a garden tool can only 20 minutes, the same amount of time the motor needs to cool. Top or bottom position of electric motor. In the latter case, the torque is transmitted directly to the gearbox (without the shaft). The weight of such a grass trimmer is 1.4-2 kg.

Important! Another significant difference between the electric trimmer and brushcutter is the inability to regulate the revolutions. In gasoline mowers, this is done by changing the amount of fuel (for this purpose, there is a gas knob on the handle). The electric motor initially runs at maximum speed.

Common constructive elements

As can be seen from the figures, except for the drive, other characteristics unite all types of trimmers. Cutting tools can be: filament for trimmers 1,2-4 mm or three- and four-blade knives that can cut branches with speed of 6000-11500 rpm, and metal disks. The bars are collapsible and solid, straight, curved, and telescopic. Handles for the convenience of trimmer control have different configurations. in the form of the letters T, D and J. On them there are control elements.

Top of the line motor grass trimmer

If the sown area is large or very neglected, it is preferable to use an electric grass trimmer with an outboard motor. It is, of course, heavier and has more trimmers with a smaller motor, but it has much more power, durability and practicality. And its thick line for the trimmer is able to overcome high, dense and quite tough grass. Natural phenomena such as dew or wet soil, which can instantly shut down the grass trimmer with a lower motor, are absolutely not afraid of models with a top motor. These grass trimmers are indispensable in areas with mixed vegetation.

Let’s proceed with disassembling the electric grass trimmer:

First, disconnect the two connected halves of the grass trimmer, the control handle from the contact connection to the electric motor itself.

In the two pics, the photo shows the sequence of disconnecting the motor from the control knob.

Next, we need to check and perform diagnostics. control knob photo Disassemble this part and perform diagnostics for individual electrical connections photo

Testing with a test screwdriver

To check the electrical connections we need a simple tool, the indicator screwdriver.

The photo shows the plug connection from the control knob. To check the electric connection chain from the plug pins to the socket pins photo, for this purpose we can short-circuit the plug by the fingers of the left hand and connect the tip of the indicator screwdriver to the socket pins one by one.

If the photo is intact, if there is no break in the electrical connections. the indicator light of the indicator screwdriver will be on, i.e. the electrical circuit is shorted by the indicator screwdriver light.

When carrying out this diagnosis it is also necessary to close the contact of the potentiometer of the pressure contact as shown in the picture

We have checked one half of the electric grass trimmer handle. the handle of the manual grass trimmer is in good condition and then we need to check the second half of the grass trimmer, which consists of the electric motor and the capacitor.

Multimeter diagnostics

We need a digital multimeter for this test. You can also use a multimeter or a multimeter like an ohmmeter. there is no difference.

Set the digital multimeter to the measurement range of the lowest resistance, connect the probe of the device to the socket of the socket connection with the lead contacts of the electric motor. The meter in this example photo 0 shows one. the reading on the meter display indicates a break in the electric circuit of the electric motor.

Need to look further at what may be the cause of the malfunction, and we will certainly need to disassemble the two parts of the enclosure, which is directly located circuit motor.

Checking the collector motor

First let’s check the collector motor. Connect the sensor probes to the graphite brushes (photo 1), the screen shows the resistance, as it is shown on the photo. 29 Ohm. Instrument reading means continuity of collector motor stator windings.

Further we see what can be the reason of malfunction. Carry out diagnostics of the wires, output contacts of the connector connection from the electric motor to the contacts of the graphite brushes.

Two lead contacts from the electric motor grasp the fingers of one hand and the tip of the indicator screwdriver touch the contacts of the graphite brushes photo 2, photo 3.

And when checking these electric parts the reason of grass trimmer malfunction will be found.

In the contact connection of photo 3 wire with graphite brush. the contact is broken. The troubleshooting of such defect is simple. For this purpose, it is necessary to etch contact connection with wire and contact connection with graphite brush with soldering acid photo 5 and solder wire with contact of graphite brush photo 6.

So, the cause of the “electric grass trimmer with a fishing line” malfunction is established and eliminated. As you have seen for yourself, such causes can be minor breakages, which can be determined without any difficulty.

It remains to you all friends to wish you a successful repair in the troubleshooting of various electrical equipment.

The device gasoline grass trimmer. Lawn trimmer device and common faults

The easiest way to give the lawnmower for repair, allocating a certain amount of money from the family budget, prompt and high-quality repair with their own hands is no less simple and convenient if you want to understand the design of the lawnmower and fix all the problems.

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

• upper part. The base of the entire structure, where all the important elements are assembled, such as the starter, carburetor and lawn trimmer engine;
• middle part. The hollow rod, inside it is the rope that connects the engine and the gearbox, which drives the cutting line for the trimmer. In this part there are mounts to distribute the weight of the entire structure and a belt for fixing the grass trimmer on the belt of the person who uses the grass trimmer for its intended purpose;
• bottom part. It contains the gearbox and cutting elements, which are hidden under a practical cover, which protects the user. The cover provides an increased level of safety by preventing coarse debris, stones and glass from getting into your hands while you are operating the chain saw.

Knowing precisely the internal structure and operating principle of the grass trimmer, you can independently carry out repair measures for the design or replace individual, failed nodes, using the instructions for repair.

The most common and frequently occurring, self-correctable machine breakdowns can be called the following problems:

• engine malfunctions that prevent the lawnmower from starting and working;
• Increased vibration of the brushcutter bar, making it difficult to use as intended;
• increased overheating of the gearbox, its accelerated heating during operation;
• slow and weak functioning of the cutting line at insufficient RPM;
• clogging of the starter grid, causing the engine to overheat and stop working;
• fast and frequent clogging of the carburetor due to the use of low-quality fuel;
• The air filter is clogged, if you do not take proper care of the device.

All of these problems can cause the device to lose its performance, before ordering the necessary parts for the mowerless trimmer should conduct a visual inspection and diagnosis of the device.

Particular attention requires individual parts and units of the device, to check them you do not have to turn to a professional master, a set of diagnostic measures will help with their own hands to identify the consequence of the loss of performance.

So how to win a line for a trimmer on the grass trimmer head mowing or braiding

The video shows in detail how to wind the line for the trimmer on the grass trimmer reel

READ How to Adjust the Needle on the ECHO Grass Trimmer Carburetor

I would like to note that the manufacturer has carefully placed a bright sticker on the panel with warnings of safety issues when working with the product. It is forbidden to use this device in the rain, and the use of protective goggles is recommended.

On the product were offered quite detailed instructions and warranty card.

No shoulder strap, but there is an additional plastic handle for support when mowing with the other hand.

Many owners of private houses and cottages carefully take care of their personal land. When the grass begins to grow actively, then there is a need for special equipment. The modern market offers a choice of lawn mowers, lawn mowers, Electric grass trimmers

The latter are profitably available; consequently, there is a constant demand for them. Electric grass trimmers are especially effective on small plots, where the extension cord is easy to extend. But difficulties arise at the stage of purchase. The range of electric tools is very diverse, so some expert advice will be relevant and relevant. What parameters to pay close attention to?

• First of all, you need to decide on the capacity. It depends on the power and speed of the engine. For well-maintained areas where you have to trim the grass, power up to 1000 watts is enough. High performance should not be pursued for any other reason. The stronger the engine, the greater the weight of the grass trimmer.
• The price and ease of use is affected by the location of the engine. Cheap models with low power have a lower motor position. But this design has serious drawbacks, such as grass clogging and poor cooling.
• For models with outboard engines, shoulder straps will be important equipment. Unfortunately, not all manufacturers bundle grass trimmers with these accessories.
• Electric harnesses vary in the shape of the handle. Lightweight devices are equipped with D-shaped holders that provide maneuverability to the grass trimmer. And the more powerful machines are controlled by a handle like a bicycle handlebar.

Our review got the best electric grass trimmers. The rating uses criteria such as:

Grass trimmer disassembly and repair

Overall design

The appearance of my electric grass trimmer is shown in the photo with an explanation of the main nodes.

Technical data of the Grass trimmer ECO GT-800L are shown in the table in the instruction manual.

When I chose it, I stopped at the power and speed of the motor. 800 Watts is more than enough power. A 1.6 mm blade is more than enough for garden and lawn trimming. You just shouldn’t allow it to grow above your knees. Otherwise you have to mow in two passes, because the long stems start to curl around the mowing head.

The electric motor housing, power button and nameplate showed close-up photo.

Disassembly

All self-tapping screws are located on one side of the motor housing. It is convenient for disassembly.

After unscrewing the fastening screws, you must carefully separate the housing halves with your fingers, overcoming the clutching force of the plastic locks. In some difficult places I put a screwdriver with a flat blade.

General view of the electric motor after removal of the top cover is shown with a photo.

Design disadvantages

Immediately after disassembly revealed weak point. the mounting node of the plastic housing to the thin-walled boom tube. I used a screw with a large thread pitch. The socket was immediately loosened and it is impossible to tighten the screw: it turns and cuts the soft metal.

Motor controls

The trimmer button acts on the microswitch lever. a micro switch. Retraction is due to the force of the springs. I didn’t have them installed correctly in the picture, I took the picture in a hurry and didn’t notice. The springs are fully housed in the inner compartment of the housing.

The same principle is used to start the motor as for. The work can be done in two ways:

From the second option for security purposes, I gave up and removed the latch and spring. I think that this mode is worth using only for stationary mounted power tools, when excluded in the home, and the electric motor does not require an instantaneous stop.

The lower half of the photo shows more clearly the micro switch button, which controls the operation of the electric motor.

The microswitch itself is conveniently located in a separate socket compartment, and its marking is shown below.

Brushes and motor collector plates

Minor soiling of brush and manifold plate contact surfaces is quite normal, corresponds to the operating conditions.

Stator and rotor motor windings

All surfaces are intact, there is no mechanical damage or traces of overheating and no temperature effect.

No paintwork damage visible.

Engine wires and bearings

Also all is normal. All structural elements are in working order, although visible minor contamination of individual parts and signs of corrosion on the magnetic core of the motor stator and metal parts.

The bearing design, by the way, was not to my liking. Plastic parts do not inspire confidence. I compare it to a Soviet-made 300-watt drill, which I’ve used for about thirty years, loading it intensively with. Drilling holes in concrete with consecutive use of a boring bar and other modes of operation.

Metal bearings never failed there. From the intensive work gradually only the collector and the brushes wore out.

Preparing the circuit

A tester is needed for this work. Disconnecting the electrical circuits on the trimmer is simple. The terminals on the motor, wires, and the micturator are the same.

Checking the operation of the microswitch and its wires

Tester in ohmmeter mode. The circuit of the electric motor was not disassembled. The wire with the crocodile planted on the random contact of the plug of the power cord, and passed the homemade probe on the conclusions of the micro switch. The tester showed different resistance readings.

It is already possible to make a preliminary conclusion that the part of wires is not broken, and the friction switch is in the disconnected position. During operation it switched on the motor. Let’s check this moment.

Crocodile stays on the plug, I hold the probe on the contact of the microswitch showing a break and close the contact by pressing the button. It is not easy to do, because you still have to take pictures with one hand.

Turning on the button showed zero resistance, indicating that the switch is working.

Checking the working circuit of the grass trimmer motor

The tester stays in the ohmmeter mode. One of its leads connected with a clothespin to the second contact of the power plug, and the other. through the crocodile to the contact of the microswitch on the motor side.

Active resistance of measured electrical circuit was 9 Ohm. Its magnitude is determined:

There is no obvious circuit breakage inside the circuit. This is also evidenced by the fact that the grass trimmer was initially turned on. But, something makes it disconnect under load.

There are only two such switching devices with power contacts in the circuit diagram of the grass trimmer:

Actually, the possibility remains that the friction switch is disconnected from the load. But knowing its structure and fixing the contact in the on-position by a mechanical hold on the fingers, you can safely assume that the cause is not in it. That leaves the second element with a power contact.

Thermal relay

If you carefully look at the connection diagram of the windings, it can be seen that in series with one of them is included some small plastic box located on the winding. One wire goes in and another comes out. The body is labeled and labeled 110 degrees Celsius.

This is a protective relay, which at normal temperature keeps the power contact closed, and at critical heat opens it. I assume that something inside it broke, began to work improperly, from the jolting opens contact.

Decided to take it out of service while testing. Removed a small piece of insulation from its wires to begin with.

Then I just twisted those wires. Shunted the trip contact this way. I took over the control of the motor temperature. I check it periodically by touch, even without that. Never felt the heat. Power of 800 watts is more than enough to cut the grass with the fishing line even for a long time.

Wrapped a piece of old duct tape around the bypass and installed the thermostat under the mounting bracket as before.