How to assemble a handle trimmer for grass hitachi. Design features

Causes of breakdowns of gasoline and electric trimmers

Grass trimmer, both electric and with an internal combustion engine (ICE), is an indispensable tool in the summer and autumn for owners of summer houses and private homes. With its help, weeds, small bushes and lawn trimming are easily removed. But, like any technique, grass trimmers fail at the most inopportune moment. To eliminate malfunctions with their own hands, the user of this equipment must first determine the cause of their appearance.

Lawn mowers and electric grass trimmers, if we do not consider breakdowns associated with the rod and mowing head, the failures mostly occur in the area of the engine.

Breakdowns of gasoline trimmers

Typical breakdowns of the gasoline grass trimmer, which the owners of this unit most often face, are as follows:

  • engine failure;
  • carburetor problems;
  • fuel supply malfunction;. malfunction of the electric cable
  • muffler failure;
  • broken gearbox;
  • starter motor broke;
  • problems with the air filter;
  • the breather plug on the fuel tank is clogged.

Faults of electric trimmers

As the device of the electric mower is much easier than mototrimmer, then there are few reasons for its failure.

It should be noted that the removal of some of them is better to trust a specialist.

Basically, the grass trimmer stops working normally in the following cases:

  • Faulty electric cable;
  • faulty control button;
  • burned out winding of the motor stator;
  • contact breakage on the engine.
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basic configuration

The Hitachi CG22EAS gasoline brushcutter comes factory supplied with the machine itself, a bicycle handle, a trimmer head and knife, a fuel mixture container and an instruction manual.

Producer Hitachi, Japan
Engine type gasoline single-cylinder four-stroke
Engine power, l.с. 0,86 л.с.
Engine power, W 0.63 kW
Gasoline tank capacity 0,45 л
Cylinder capacity 21.1 cm 3
Rod version straight
Boom diameter 24 mm
Handle “bicycle”
Starting system hand starter, soft start
Drive petrol
Cutting width with a fishing line 440 mm
Width of blade bevel 255 mm
Weight 4.7 kg
Dimensions (LxWxH) 1745 x 730 x 525 mm
Dimensions of the package 1000 x 1000 x 108 mm
Drive shaft warranty lifetime

Removing and disassembling starter, replacing broken parts

To make a grass trimmer starter repair, you need to first disassemble and then reassemble. The process is not particularly difficult. You need a screwdriver with a tip of the right shape for the job.

Do it all with care, respecting safety precautions, mainly so that the spring, if accidentally thrown out, does not injure the master.

Disassembly of the starter unit

Disassemble the starting mechanism in order to install new parts in place of the broken ones in the following sequence:

  • unscrew the screw that secures the pulley with the starter cover with a screwdriver;
  • take out the spring and the tendrils;
  • Remove carefully the pulley (you need to turn the head or work, wearing goggles and gloves beforehand);
  • determine why the trigger mechanism is broken;
  • if the spring is almost completely destroyed, it is replaced;
  • When the spring is out of the hook, it is installed in its original place, bending before doing so the tendons (the photos show the process of laying);

to change the spring, you must work carefully and carefully: it can, under the influence of the force caused by installing it in place, accidentally burst. even if you carefully remove the roller, the spring band quickly flies off the coil and can injure your hand with its sharp edges.

It is not always possible to put the sprung plate back in its place straight away. It often slips, so attempts must be repeated until the desired result.

Assembling the starter

Assembly of the starter unit is carried out in a series of steps:

When performing the above operations, two washers must be put underneath. If this is not done, the spring will eventually damage the plastic cup, and when it is tightened, it will begin to jam. Because of this there is a feeling as if the spring has come off. To eliminate this defect, you need to install this part of a longer length or an additional washer.

When such parts are not available, you can just unscrew the screw a little and the starter unit will work without cinching. But this option is temporary. it is better to repair quality as soon as possible.

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Spring tension

After installing the spring, it should be tightened. To do this, carry out the following steps:

  • Remove the handle from the starter cord;
  • then insert the rope into the spool slot;
  • make tensioning of the spring, rotating the spool in the opposite direction to the clockwise (winding);
  • Make the required number of revolutions specified in the instruction manual of the grass trimmer model used and corresponding to the length of the cord used;
  • at the very end of the rope is put through the hole designed for this purpose, located in the starter cover;
  • put the handle in place, fixing it with a knot.

If after repairing the spring continues to fly off, then get rid of it in the following ways:

  • squeeze a suitable size piece of plate into the groove at the location of the spring hook;
  • drill holes on both sides of the groove in the spool, in which to insert the catch of the spring and fix it with a wire.

Replacing a torn cord

Replace a broken cord in the following sequence:

  • the old rope is removed;
  • Choose a rope suitable in size (thickness and length);
  • passing it through a special hole, located in the coil, tie a knot;
  • Pluck the spring, making the desired number of revolutions;
  • fixing the handle.

it is better to perform tensioning of the spring plate together with a partner, so the edge of the cord will not wind up inside the starter mechanism.

To assemble the starter on the trimmer and wind the spring is not difficult, but you should do it carefully and with care. For different models of chain saws the breakdowns of the starting mechanisms are the same, so they are repaired in the same way. There are some nuances associated with their design features.

Tools for repair

The work required screwdrivers and an old tester with wires and a soldering iron.

I had my camera with me and managed to film all the actions to restore the performance of the electric motor. I inserted these pictures into the text of the article.

Circuit wire-checking

To check the electrical circuits, it is necessary to. I have an old device C4324 in my country house for this purpose. Power supply to the current measuring circuit is provided by the nickel cadmium batteries.

After long storage they were in the discharged condition, and operated since 1994, when I bought them at a garage sale. It was no longer possible to use them.

Power supply to the tester

The technical solution was suggested by an old cell phone. To supply voltage to its battery, pre-tested it with the same device in the voltmeter mode.

Took out old batteries, and connected power with thin wires of different colors directly to the leads of the tester, observing polarity. Used soldering iron and duct tape for connection.


Here there was no problem. Power of the cell phone battery was quite enough for measurements and calibration.

I set the switches of the device to the “Ohmmeter” position, and with the potentiometer knob I set the pointer of the arrow to zero. I didn’t adjust the mechanical rocker arm, it was fine before.

The tester is ready to measure the resistance on Ohms graduation.


The case of the electric motor is fastened with self-tapping screws with medium-sized Phillips heads. An old screwdriver from Soviet times fit them satisfactorily and a good edge coverage was created with a head from a tool kit bought in an online store.

However, the short working body of the combination screwdriver made it impossible to work in deep recesses. All the hard-to-reach places were inaccessible to her. Pictures of the screwdrivers are shown in the following pictures.

How to disassemble and repair the electric scythe yourself

Before you disassemble and repair the electric braid, you should check the condition of the socket and the mains voltage. If its value deviates from the norms specified in the instruction manual, you should not even try to operate the device without a stabilizer designed for the appropriate power. Otherwise the electric motor can be damaged. Only after you have determined that the reason of the grass trimmer’s failure is directly connected to it, you can begin to disassemble the mechanism for repair.

Dismantling and repairing the electrical parts

To disassemble the electric grass trimmer for repairing its electrical components, proceed as follows.

  • Put the grass trimmer on a flat surface (for example, a table) that does not contain any unnecessary objects.
  • Unscrew the screws of the cover, located on one side.
  • Remove the unscrewed half of the housing, gaining access to the start button, electric motor, brush assembly, bearings, electrical connections (these elements are shown in the picture below).

Brush and bearing units are shown in the photo below.

Grass cutter will work without a thermostat, but you will need to constantly check the temperature of the electric motor, periodically letting it cool down. You can also install a new analogous sensor.

You can check the motor starter button by shorting its contacts. If the grass trimmer works, the problem is clear. But it is not safe. You should be careful not to get an electric shock. To change the button use a screwdriver to remove it from its seat and connect the wires from the old to the new. After replacement, it is necessary to assemble the electric scythe, and then check its performance.

Brushes need to be replaced if they are destroyed. It is sufficient to remove the old ones from the grooves and install the new ones in their place.

Connecting terminals on different trimmer models are almost identical, so you can connect and disconnect wires in the same way.

Replacing the bearing is a fairly complicated operation because it can get stuck and not come off the motor shaft. Pull or knock it down carefully, so as not to damage the rotor or the landing place.

When the electric motor of the grass trimmer fails, and it is necessary to replace it with a new one, you should carefully remove the fan and bearings, and then install them in their original place. The replacement costs are almost the same as buying a new machine. If you have no experience with electric motors, it is better to entrust it to professionals.

Reassembling the electric mower

The instructions for assembling the electric part of the brushcutter are as follows:

New Hitachi String Trimmer ( Unboxing )2020

  • The engine is mounted by screwing in the fastening screws;
  • connect the electrical circuit;
  • lay the wires carefully between the individual compartments in the available recesses;
  • Close the top cover by snapping the locks and screwing it down.

After reassembly, check the operation of the device.

Possible breakdowns in gasoline and electric trimmers quite a lot. To keep the unit working for a long time, it should be kept clean, in a dry place. An important point is to take regular preventive measures (e.g. gearbox lubrication) and to follow the rules of operation set out in the manual of the device. It is better to buy equipment of high quality and from reputable manufacturers.

When disassembling the mechanism it is recommended to photograph the process step by step so as not to forget anything, and when reassembling not to miss any part. When replacing parts, you should pay attention to the choice of suitable components: it is better to use original spare parts.

Some models have a boom consisting of two parts. for their connection use a coupling. These machines are easy to transport.

Assembling the grass trimmer in STEPs

Fixing the handle of the tool

Unscrew the thumbscrew 2. Remove the upper cover of the fastener

To adjust the handle, loosen the wing nut and move it. After that the screw should be fixed.

FUBAG Electric Trimmers Are equipped with rubberized handles, which increases convenience and safety of use. These hold the tool securely in place, even in wet hands.

Fitting the safety cover

Aligning the holes in the blade guard and the attachment bar.

Fasten the cover to the rail with screws and washers, using the wrench provided.

In this model, the hood is secured with metal plates on both sides. This guarantees additional reliability and durability of the grass trimmer.

The cowl itself is made of dense but flexible plastic. This material will not fall off when hitting small obstacles. We advise to pay attention to this if you are going to Choose an electric trimmer for the grass or a gasoline trimmer.

Fasten the shoulder strap

One of the easiest assembly steps for the electric trimmer. Many will understand how to attach the shoulder strap intuitively. For those who are not sure, we decided to add a few important points to the instructions:

Connecting the carabiner to the strap ring 2. Adjust the position of the attachment ring on the boom 3. Fixing the ring with the fixing screw

Install the spool of fishing line

First, align the hole on the washer with the hole in the gear cup and lock with a special pin.

Unscrew the fastening nut from the hub clockwise. 3. We remove the cup from the shaft and the pressure washer

Screw the spool of fishing line counterclockwise as far as it will go, holding on to the rod.

When selecting a grass trimmer, take the quality of the bobbin from the kit into account. Often it is the spool that becomes the subject of economy to reduce the overall price of the product. How to find a fault? Good spool is a quality plastic, easy to open and allows you to refill the line for the trimmer without much difficulty.

Hitachi brushcutter range

than 10 models of Hitachi gasoline mowers and brushcutters are available on the Russian market. It is worth noting that lawn mowers from this manufacturer can be used to cut grass and shrubs, depending on the model and its specifications.

Model range of trimmers Hitachi is represented by a wide range of devices for various purposes. Hitachi lawnmowers can be used for eliminating weeds, excessive grass, trimming bushes and small tree limbs. Distinctive features of gasoline mowers of this brand can be distinguished:

  • versatility of models;
  • ergonomics;
  • compactness;
  • excellent technical characteristics;
  • additional functionality.

Hitachi CG22EAS

One of the first Hitachi chain saws. This device is available in several variations. The most popular: cg22eas NB and SP. This grass trimmer is equipped with a two-stroke engine from 0.63 kW. working width is 42 cm. optimal area for work. 10 acres. Maximum rotation speed is 13 thsd. revolutions per minute.

Lawnmower has a bicycle type handle. The base (boom) is made as one piece construction. When working with a chain saw there is a noise of 107 dB. The manufacturer recommends the use of protective headphones while working with the lawnmower. Volume of the fuel tank. 450 ml. Newer models have 520 ml fuel tank capacity. The weight of the model is 4.4 kg.

Hitachi CG25EUS

powerful than its predecessor, the brushcutter is designed for use in the backyard or garden. Great for cutting weeds, small branches of bushes, cutting grass. Engine power is 0.810 kW. lawnmower is equipped with a four-stroke engine.

  • The manufacturer has increased the volume of the fuel tank to 550 ml;
  • the presence of the anti-vibration system;
  • Reduced noise level (104 dB);
  • Additional strap for more comfortable operation.

As a cutting blade can be used as a line for the trimmer, as well as a paddle blade. Weight. 5 kg.

Hitachi CG27EAS

Powerful lawn mower, can be used in the garden, in the countryside, for park and shrub care. The manufacturer has equipped the machine with a two-stroke engine rated at 0.880 kW. It comes with two blades of grasshopper accessory. Maximum mowing width: 42 cm. Fuel tank capacity: 520 ml. It has a belt for easy handling. Among the innovations: it is equipped with a noise reduction system and an electronic ignition system (easy start). Weight 5 kg.

Hitachi CG27EAS NB

This lawn mower is characterized by improved technical features:

Hitachi CG27EAS NB comes with a set of tools for assembling equipment and safety glasses.

Hitachi CG47EY-T

Powerful and modern professional lawn mower. If you compare the previous experience of the developers, this mower is the most powerful and productive among those on the market. The mower is designed for daily work in a large area. Ideal for garden work, cutting down small diameter knots, pruning shrubs and grass.

Often used by businesses to care for parks and public areas. Hitachi CG47EY-T lawnmower is equipped with 1,8 kW two-stroke engine. Blade blade, included with the machine, is used as a cutting blade. At the same time, if necessary, the operator can replace the cutting blade with a nylon line for the trimmer. Unlike previous models, the Hitachi CG47EY-T has a collapsible boom for easy transportation.

Fuel tank capacity. 1 liter. Due to the increased fuel capacity, you can work twice as hard with the petrol mower compared to other models of the same brand. Maximum mowing width of 46 cm. Among the features of the grass trimmer can be distinguished:

  • advanced easy start system;
  • anti-vibration system;
  • Availability of double air filters;
  • larger fuel tank and durability;
  • Ergonomic design, sturdy straps.

All these features ensure reliability and durability. It weighs more than 8 kg. The high power and technical features of the device are stipulated by the high power and technical characteristics of the device.

Hitachi CG31EBS

This weed trimmer is a lightweight and easy-to-use product. It has a power of 1 kW. Hitachi CG31EBS is suitable for countryside works, for cutting weeds and grass on medium-sized areas (over 15-18 acres).

How to Cut Grass with String Trimmer

Lawn mower is characterized by low noise level (98dB), what allows using it in cities, close to houses. Fuel tank capacity is increased to 670 ml. The adjustment of the mowing height is done manually. Weight of the mower: 6.7 kg. Nylon line for trimmer or paddle blade can be used as cutting element. Coil with a fishing line is included with the product.

Hitachi CG24EKD

Average lawn mower in terms of power. Compared to the first two variants of the range, the Hitachi CG24EKD is the second. The product is based on a 0.65 kW two-stroke engine. This variant differs from the previous, weaker models by the type of handle, in this device it is loop-shaped. Another feature of Hitachi CG24EKD is a collapsible hose. This is an important factor when storing and transporting for long periods of time.

I am also pleased with the small weight of the device. 5.3 kg. According to user reviews, this type of handle is more convenient to use than models with a bicycle handle. The working width is 43 cm, the fuel tank capacity is 520 ml. According to noise level, the Hitachi CG24EKD is also a medium model (104dB).

How to adjust the carburetor

Adjustment of the module is done by the factory. In the process of using the unit, after repairing or cleaning the module, it becomes necessary to adjust the carburetor.

Tuning of the carburetor does not require replacement parts. Adjustment is made with the help of 3 screws, which are available in the construction:

  • L. controls the fuel supply at low rpm;
  • H. controls fuel consumption and temperature, and is also responsible for gasoline supply at high revolutions;
  • T is responsible for the engine idling.

Adjustment of the grass trimmer carburetor is carried out after the engine warms up. 10 minutes of idling will be enough for this. Turning the mowing head at idle speed allows you to proceed directly to the adjustment of the screw T. Turn it counterclockwise until it stops rotating. Then turn the screw H to the right and left to find the position at which the idle speed is at its maximum. The screw is unscrewed ¼ of a full turn counterclockwise from the point found, this will be the working position.

By the same method adjust the L screw. After repairing the carburetor, the module is sure to adjust, so that the device works properly.

The structure of the gasoline grass trimmer. Lawn mower design and common faults

It is easiest 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 trimmers are based on the use of common technology, a typical design scheme consists of certain elements and parts, it is important to know when carrying out independent repair work:

  • upper part. The basis of the entire structure, where all the important elements are assembled, such as the starter, carburetor and lawnmower engine;
  • middle part. Hollow rod, inside it there is a cable that connects the motor and the reducer, which drives the cutting line for the trimmer. In this part there are mounts for weight distribution of the whole construction and a belt for fixation of the grass trimmer on the belt of a person using the grass trimmer for its intended purpose;
  • bottom part. It has a gearbox and cutting elements that are hidden under a practical cover to protect the user. The cover provides an increased level of safety by preventing large debris, pebbles and glass from getting into the person while working with the chain saw.

Knowing precisely the internal structure and operating principle of the grass trimmer, you can independently carry out repair measures for the structure or replace individual, worn-out units, using the repair manual.

The most common and common, subject to self-correcting breakdowns of the unit can be called the following problems:

  • engine malfunction, due to which the lawnmower does not start and does not work;
  • Increased vibration of the brushcutter boom, making it hard to use the brushcutter for the intended purpose;
  • Increased gearbox overheating, accelerated heating during operation;
  • slow and weak functioning of the cutting line at insufficient RPM;
  • Blockage in the starter grid, causing the engine to overheat and stop working;
  • rapid and frequent clogging of the carburetor due to the use of low-quality fuel;
  • clogging of the air filter if you do not take care of the device.

All of these problems can cause the unit to lose its serviceability, before ordering the necessary spare parts for the snowplow, a visual inspection and diagnosis of the unit should be made.

Special attention requires separate parts and units of the device, to check them you do not have to go to a professional technician, a set of diagnostic measures will help your own hands to identify the consequence of the loss of performance.