How to disassemble the engine from the lawn mower. Can it be washed with water?
REPAIRS AND REPAIRS OF APPLICES
Lawn mowers are a convenient equipment that allows you to maintain in the country, in the garden, the park of herbal cover in a well.Groomed state. Thanks to their use, lawns acquire an attractive appearance with minimal labor and time. Gasoline and electrical devices that have pushed to the background are popular with the popularity of mowers.
With proper operation, the equipment is capable of working for more than one year without breakdowns. But over time, the details wear out or an unforeseen accident may happen, as a result of which the unit will fail. If the equipment is not under warranty, then it is not necessary to contact the service center for help to specialists. Repair and maintenance of lawn mowers can be carried out at home. This is due to the fact that many malfunctions do not relate to serious breakdowns, they can be easily eliminated on their own.
How electric lawn mowers are arranged
The general layout of electric lawn mowers is the same.
An electric motor is installed on the wheel chassis, directly or through the belt gear, a rotating cutting tool that cuts the grass at a certain height.
However, despite the general principle of work, all braids are divided into types of:
Type of chassis
Most lawn mowers are equipped with a four.Wheeled chassis with a rigidly fixed axis of the front wheels, so for turning, especially during mowing grass, it is necessary to press a little on the handle to tear the front wheels from the ground.
Indeed, during the turn, the direction of movement of the apparatus and the direction of rotation of the wheels do not coincide, which is why the latter resist the side movement, and the cooler the turn, the stronger they resist the movement.
Some models are equipped with front piano wheels, the axis of which does not have rigid fixation, so that the axis of their rotation clearly follows the trajectory of the lawn mowing, therefore, regardless of the steepness of the turn, they never move sideways.
Almost all three.Wheeled lawn mowers are equipped with front piano wheels, so it is much easier to control them than four.Wheeled. However, the most maneuverable are two.Wheeled models, because regardless of the steepness of the rotation of their wheels never move sideways.
Asynchronous and synchronous engines are installed on electric lawnmands.
The former have somewhat smaller efficiency, but it is much easier to perceive high loads or overloads, the latter more effectively turn electrical energy into rotation of the shaft, but greatly increase the cost of the apparatus.
This is caused by both the highest cost of synchronous engines, and the need to protect them using belt transmission. The main difference between synchronous engines is the presence of contacts (collectors), therefore they are sometimes called collector engines, confusing with direct current motors.
Devices with a synchronous engine are well suited for the mowing of lawns and other territories planted with cultural vegetation, however, their use in areas overgrown with wild grass, especially tall and thick, is undesirable.
After all, such vegetation sharply increases the load on the engine windings and the brushes of collectors, as well as on the details of the belt transmission, all this leads to a rapid decrease in their resource. Asynchronous engines are deprived of this drawback, however, when working with them, it is necessary to use different methods of mowing well.Groomed and high grass.
Type of cutting tools
The vast majority of the devices are equipped with a rotary cutting tool, that is, knives mounted on the engine shaft, which rotating, cut the grass and throw it through the side or rear window. During the rotation, such a knife is created by a vertically directed air flow that raises crushed grass and provides an even surface after mowing.
To some extent, the rotor cutting mechanisms can also be attributed to fox, which are installed on wheeled trimmers for the grass, only instead of a metal knife they cut the grass dispersed to huge speeds with a fishing line.
The main drawback of the knives of the rotary mechanisms is their vulnerability before solid obstacles, because rotating at high speed, they stock up enormous kinetic energy. Therefore, in a collision with an obstacle, not only defects of the cutting edge appear, but also the shape of the knife is often disturbed, due to which an imbalance appears, leading to strong vibration during engine operation.
Part of the lawn mower is equipped with a drum cutting mechanism, which is a hollow drum of steel plates, as well as a sharply.Mounted knife operating on the principle of scissors.
The rotating drum captures the grass and leads it to the knife, which cuts vegetation, so such a mechanism is deprived of the main lack of rotary analogues. After all, the speed of rotation of the drum is much lower, which means that the energy accumulated in it is not enough to damage the plates, in addition, the knife does not contact obstacles at all, so defects do not appear on its cutting edge.
Method of ejection and processing of grass
The knife rotating at high speed not only cuts off the grass, but also gives it acceleration, so that the centrifugal force presses the cut vegetation to the deck, so it flies through the rear or side window, depending on the configuration and the operating mode of the mower.
If both holes are closed, then the cut grass passes between the ends of the knife and the walls of the deck, after which it falls down.
When working in this mode, falling fragments are quite large, comparable to those that fly through the windows provided for this.
If, together with a regular knife, set additional (mulching), then the size of the grass falling to the ground will be reduced several times, so this mode of operation is called mulching. All rotary braids can not only throw the grass back, but also collect it in the grass collector, this mode is in demand where for any reason you can not leave mowed vegetation on the site.
Drum mowers work a little differently. Rotating, the drum accelerates the fragments of cut vegetation inside it, which are pressed to the tightly adjacent gas mowing housing. Therefore, at the time of passage through the output window, they fly out under the influence of centrifugal force.
All drum braids are equipped only with the rear emission, however, part of them includes a grass collector, so such models can be used not only for haircuts, but also to remove mowed grass from the site.
Way to travel
All electric lawns, regardless of the type of cutting mechanism, are divided into self.Propelled and non.Self.Propelled. The former is equipped with a clutch and belt transmission, as well as a gearbox that lower the speed of rotation of the engine to the optimal level for wheels.
Removing and disassembling the starter, replacing broken parts
To repair the starter of the trimmer for the grass, you will need to disassemble it first, and then collect it. This process is not a particularly difficult occupation. For work, you will need a screwdriver with the tip of the desired shape.
Everything should be done carefully, observing safety precautions, mainly that the spring does not injure the master if an accident.
Parsing the starting node
They disassemble the launch mechanism in order to install new parts instead of broken in the following sequence:
- Spin a screw with a screwdriver, fixing the pulley with a starter lid;
- Take out a spring and antennae;
- Remove carefully with the pulley (you need to unscrew the head or work, having dressed the glasses and gloves before);
- Determine why the launch mechanism has broken;
- If the spring collapses almost completely, then it is replaced;
- When the spring exits from the hook, it is installed in the original place, bending the antennae before this (the photographs show the laying process);
To change the spring, you should work carefully and accurately: it can, under the influence of the effort caused by the installation of it in place, accidentally burst. Even if you carefully remove the video, then the spring strip flies very quickly from the coil and can injure your hand with its sharp edges.
Immediately putting a springy plate in the same place does not always work. It often slips, so attempts are required to repeat until the desired result is achieved.
The assembly of the starting node is carried out in a number of stages:
When making the stated manipulations, it is necessary to lay two goals. If this is not done, then the spring over time damage the plastic cup, and when it is pulled. Because of this, a feeling appears, as if the spring had flown. To eliminate such a drawback, you need to install this part of a larger length or an additional goal.
When such spare parts are absent, you can just unscrew the screw a little, and the starter knot will begin to work without shaken. But this option is temporary. It is better to repair qualitatively as quickly as possible.
After installing the spring, it should be pulled. The following actions are performed for this:
- Remove the handle from the starter cord;
- Then the rope is inserted into the coil groove;
- They stretch the spring, rotating the coil in the direction opposite to the clock of the clock arrow (reviews);
- Make the desired number of revolutions specified in the instructions for the use of the trimmer model used and the corresponding length of the cord used;
- At the very end, the rope is threaded into a hole designed for this, located in the starter cover;
- Put the handle in place, fixing it with a node.
If after the repair the spring continues to fly, then you can get rid of this in the following ways:
- Squeeze the suitable piece of the plate into the groove at the location of the spring hook;
- Drill holes on two sides of the groove in the coil, into which the spring hook is inserted and fix it using a wire.
Replacing a torn cord
A torn rope is replaced in the following sequence:
- The old cord is removed;
- Choose a suitable rope (thickness and length);
- Having reached it through a special hole in the coil, a knot is tied;
- Sprinkle a spring, producing the required number of revolutions;
- Fix the pen.
It is better to stretch the spring plate along with the partner so that the edge of the cord does not hit the starter mechanism.
It is easy to assemble a starter on a trimmer and wound a spring, only you should do it carefully and with caution. For different models, the gas tanks of the launching mechanisms are the same, so they are repaired in a similar way. In this case, there are some nuances associated with their constructive features.
Common malfunctions of electric trimmers
Electric trimmers for grass differ from gasoline devices with a more simplified design. Conditionally electric braid is divided into mechanical and electric part. Accordingly, the same groups of malfunctions are distinguished, arising to these equipment.
Most of the breakdowns can not be visually identified. For this you will need to use various devices. You can visually determine the following:
- The integrity of the power cable is violated (insulation is broken from it, or it is clearly interrupted);
- Sustaining or jamming of the trigger button;
- Mechanical external damage to motorcycles;
- Problems with the cutting part;
- Stopping braids for grass when clogging with grass;
- Damage to the fork.
To find out which part has broken in other cases, you will need to disassemble the electric shock and sequentially check the most likely options. At the same time, they pay attention to the external manifestations of deviations from the normal operation of the device. They contribute to the establishment of the cause.
Repair of an electric trimmer for grass will require the presence of the following devices and tools:
Electric braids for grass often do not work due to causes that are not directly related to them, but caused by a decrease in the supply voltage in the network or the ineffective state of the used outlet used.
How to determine the cause of the failure?
Repair should begin on the principle of “from simple to complex”, that is, it is recommended to start repairs by checking the presence of gas in the tank. If the gasoline engine stops after wintering, replace the fuel.
Unfortunately, fuel does not always have worthy quality. Therefore, during a long.Term downtime, it can be distinguished or precipitated. And engines are sometimes very sensitive to fuel quality.
If there is no doubt about the latter, but the lawn mower does not start, it is necessary to check the spark, disconnecting the wire with the cap from the spark plug, unscrewing it using the attached key.
Attach the spark plug to the clean metal surface (without painting) of the engine, first putting the lid on it and asking someone to pull out the starter.
If an unstable and weak spark appears, the candle must be cleaned with a file or sandpaper.
Another problem that is easy to eliminate. This is a clogged fuel hose. They check this, turning it off: if the fuel does not flow, the filter or the inside is clogged. The filter will need to be replaced, the inside can be cleaned using a needle.
Well, if after that the mitch earns. However, the cause of a malfunction in 90% of cases lies in another. Carburetor malfunction that needs to be repaired. You can deal with repairs with sufficient experience. In his absence, you will need the help of the service center.
Why is it worth involving a specialist in repair?
Some owners of electric motors, both legal and individuals, try to carry out their repairs on their own without turning to specialists, while, for example, they do not know that the same repair of an electric motor with a short.Closed rotor has their nuances. So, for example, you can make a mistake in installing shields in relation to the status, as a result of which the repair work is delayed.
As for the main technological operations performed during this type of repair, they are as follows:
- Opening the electric motor;
- Search and diagnosis of malfunctions;
- Replacement of defective parts;
- Repair of defective parts, for example, rewinding the winding;
- Installation of new and repaired parts to the place;
- Testing a renovated engine for performance.
In addition to the fact that all these operations require special knowledge, special tolerances are also required to work with electrical equipment, so only an employee who has such an admission should be carried out by the same repair of the rotor of the alternating current electric motor. At the same time, it is always worth remembering that such well.Known brands as Elektromash, Siemens, AVV and others can establish their requirements for specialists performing repair work on electric motors they have issued.
The most common problems
Here are the most common malfunctions:
- The engine does not start;
- The motor stalls arbitrarily;
- The engine does not gain momentum or does not hold them;
- Immediately after the start of the mowing, the engine speed falls and it stalls or works with interruptions;
- Smokes strongly;
- It goes badly;
- Does not stop even after the operator released the wheel drive lever;
- Shakes hard;
- Poorly cut the grass.
The engine does not start
There are quite a lot of reasons why the motor does not start:
- Empty fuel tank;
- A air filter is clogged;
- A muffler is clogged;
- The ignition switch is installed in the wrong position or faulty;
- The air damper control lever is in the wrong position;
- Faulty candle;
- Broken or clogged carburetor.
To establish the real cause of this defect, you must first conduct a full external inspection and make sure that the openings of the air filter or muffler are not clogged, there is gasoline in the tank, and the throttle control lever and the ignition switch are in the correct position.
If everything is in order with this, then it is necessary to carry out pre.Launch work, including cleaning air or fuel filters, described in detail in the instructions for the operation of the mower, and then try to start again.
After making sure that the motor still does not start, the mowing is placed on the table and proceed to a more detailed search for the reasons.
First, the spark plug is twisted and tightly plug the candle hole with your finger, then smoothly, but quickly and strongly pulled the hand starter cable or pressed on the electric launch button.
The moving piston should create sufficient air pressure so that it pushes the finger and goes outside. If this does not happen, then the motor needs serious repairs, which is difficult to make at home, so it is better to take the mower to a specialized workshop.
After all, the reason that the piston does not move after the starter’s cable or rotating the shaft of an electric starter may be:
- Damage to the starter, because of which he does not transmit the energy of rotation to the engine shaft;
- The cut off the flywheel that connects the flywheel and the starter with the engine, and also provides the correct ignition angle.
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To eliminate both malfunctions, not only tools, but also skill are needed, so those who do not have the skill of repairing any engines are better not to try to eliminate such problems on their own.
If the piston moves, then you must first check the fuel supply, for which the candle is thoroughly wiped with a dry clean rag, then screw it into place, and the regulator of the position with an air damper is placed in the “OFF” position, as during the start of the engine.
After that, the fuel is pumped up (if the engine design provides) and twitch the hand starter cable several times or pressed on the electric starter button and hold it for 1-3 minutes.
Then, the lever of the air damper is transferring to the “ON” position and the candle is unscrewed, which is carefully examined.
Wet contacts indicate that gasoline enters the engine and the problem of ignition, and dry contacts say:
In both cases, knowledge and equipment are necessary for proper diagnosis and repair, therefore, it is better to take the device to repair the apparatus to a specialized workshop.
If the fuel comes, then it is necessary to check the external condition of the ignition coil and the high.Voltage wire. If they have cracks or poor contact as between the wire and the coil, so at the place of connection of the wire with the candle tip, they must be replaced.
If everything is fine, then you need to check the spark, for which you can use both a deliberately serviceable candle and a bolt suitable in diameter, which is inserted instead of a candle in a high.Voltage wire.
The operations described below, if they are performed with errors, can damage the ignition coil, so if you are not sure that you can do everything right, then it’s better not to take risks and entrust such a check to professionals.
The candle is leaned with threads against the ribs of the engine cooling shirt, and the bolt is placed so that it does not come into contact with the mowing case or its engine, and the distance from it to the cooling shirt was 1-2 mm.
After that, disconnect any wire going to the ignition switch, then pull the lever of the manual starter or press the electric button and see if the spark will appear.
If there is no spark, then the device does not start for one of the reasons:
For the repair of these damage, skills and equipment are needed, so those who do not have them are better to trust professionals. If there is a spark, then the problem is in the spark plug, so after replacing it will work.
The motor stalls arbitrarily
The most frequent reasons why the engine stalls during operation are:
- Dirty air filter;
- Dirty fuel filter (only for models with a fuel filter);
- Faulty ignition switch (does not completely open the ignition circuit);
- Damaged insulation of the ignition shutdown wires;
- Faulty air damper drive;
- The tightness of the ignition coil is broken or its winding is broken.
The primary inspection is performed in the same way as described in the previous section. If everything is fine outwardly, then carefully examine and feel all the wires suitable for the switch that blocks the operation of the ignition system, is possible somewhere damaged and when contacting the naked metal of the case, there is a short circuit that extinguishes the spark.
We identify the cause of the malfunction
To repair the lawn mower yourself, it is best to be guided by the principle of “from simple to complex”. First, check if there is enough gasoline in the tank. If the mower stopped starting after wintering, it is worth draining the old fuel and replace it with a new. Sometimes low.Quality gasoline comes across, which can give a precipitate or even delay in the winter, and some gas mowers are very sensitive to fuel quality.
If there is confidence as gasoline, but the lawn mower does not show signs of life, the next thing you need to do is check the spark. To do this, remove the wire with a cap from the candle and twist it with a special candle key, which should go with the lawn mower. Then throw the cap on the candle, attach its threaded part to the metal part of the engine and ask someone to pull the starter. At this moment, a bright blue spark should appear, which is clearly noticeable even during the day. Keep in mind that you need to lean the candle against the clean metal surface of the engine, which is not covered with paint and which can be current.
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Discussion on the forums
Here are links to forums whose users discuss various aspects of the repair of electric and gasoline trimmers, because these devices differ only in the type of motor:
In this video, we will talk about the repair of the Chinese electrimmer with your own hands to make it more reliable:
See how to repair a trimmer for grass, if the shaft with a coil does not twist:
How to diagnose a breakdown of the gearbox and repair it: