Before starting to repair the mower engine, it is worth checking to see if the pistons are stuck. To do this, it is necessary to dismantle the motor. We also remove the carburetor from the structure and conduct a visual inspection for possible defects. Usually a special TOREX screwdriver with attachments is needed for disassembly.
We inspect the gaskets for breaks or burnout. If this is found, then it is necessary to ensure the tightness of the structure by replacing them with new ones. The air damper can contain carbon deposits that reduce the quality of the air / fuel mixture. You need to get rid of it by cleaning the carburetor by washing the unit in a solvent or kerosene.
Choking during operation or the lack of a set of them to enter the operating mode together with overheating of the power unit are the reasons for such events:
Remove the carburetor fuel chamber cover and clean it. For this, an ordinary vadashka is quite suitable, but you can also buy a special liquid.
To clean the fuel chamber, first wipe it with WD-40, then soak it for 15-20 minutes, wipe it again. This should be repeated 3-4 times to completely clean the chamber and channels.
After purging, the carburetor is assembled and returned to its place.
A clogged exhaust will result in a restriction of the exhaust flow from the exhaust pipe. Resins appear on the inner surface due to an incorrect ratio in the mixture of fuel and oil. We twist the crankshaft so that the piston goes up to the maximum and clean its surface with a wooden stick.
In more serious cases, it is recommended to contact the service under warranty. Otherwise, non-professionalism will bring more breakdowns. Moreover, if you independently search for faults and repairs during the warranty period, the warranty will expire.
VIDEO: Instructions for disassembling and cleaning the carburetor using the example of BRIGGS & STRATTON
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Hello! In this article, we will get acquainted with general recommendations for repairing do-it-yourself lawn mowers. And to be more precise, electric lawn mowers, although the principle of their construction is generally the same everywhere, be it electric or gasoline. The drive will only be different. There are several types of electric lawn mowers. They are cylindrical, rotary and mulching. Let's consider the principle of operation and the device of each separately. This gives us the opportunity to successfully repair lawn mowers with our own hands and operate them correctly.
These lawn mowers have a set of spiral blades that together form a cylinder. The knives are driven by a large toothed pulley mounted on their axle. The rotation of the electric motor is transmitted to the knives by means of a toothed belt. The lawn mower is moved using a roller, which is driven by the same knife drive electric motor.
Rotary lawn mowers are equipped with a single horizontally positioned blade attached to the motor shaft.
Many lawn mowers have containers for clippings. Those mowers that chop the grass into small pieces and leave them on the lawn as mulch.
All modern lawn mowers are equipped with devices that ensure safety during operation by the fact that there are special handles that must be activated at the same time, emergency shutdown and safety interlock buttons. This must be taken into account when repairing lawn mowers with your own hands. If you are tired or unsatisfied, do not start mowing the lawn. Postpone this activity until you are healthy. Avoid putting yourself and others at increased risk from the mower in operation.
1.Knives are dull or damaged ... In this case, of course, you need to check the knives and, if necessary, you can replace them with new ones or sharpen them on emery.
If you have a lot of time, you can work with a file. When sharpening, do not neglect goggles and thick gloves. The knives are sharpened on each side at an angle of about 30 degrees. You can also use special sharpening devices supplied by the manufacturer of this mower model. This is mainly done using adhesive abrasive belts on the fixed blade of the mower.
In this case, the gap between the fixed and movable knives is set small so that the rotating knives touch the abrasive belt.
Then plug the mower in and drive the machine at short 15 second intervals until the blades are sharp. Remove the abrasive belt and adjust the normal gap.
2. Incorrect blade adjustment ... On cylindrical lawn mowers, the gap between the rotating cylinder and the bedknife should be less than the thickness of the paper.
To do this, refer to the user manual for your particular lawn mower model. Disconnect the plug from the socket before adjusting. Achieve uniform clearance along the entire length of the cutting blade.
1 stuck knives ... Long grass can block the mower blades. Unplug the mower and use a wooden stick to turn the cylinder in the opposite direction until it turns freely.
2. The drive belt is broken. ... When a cylindrical mower is operating, the drive belt wears out and this leads to its frequent breakage or stretching. To replace the belt, do the following:
Install the new belt on the small gear and gradually turn the large pulley, put the belt on it
A correctly tensioned belt should have no more than 4mm deflection when pressed with your finger.
3. Broken power cord ... When operating the mower, the power cord moves around the lawn and constantly bends. As a result, the copper conductors of the power cord are often broken. Therefore, if the mower is silent, then start the repair of lawn mowers by checking the supply cable for an open. To replace the power cord, unplug the power plug, unscrew the switch cover and set it aside.
Before unscrewing the power cord retainer, remember how it was connected to the switch.
To disconnect the cord, insert a 1mm Allen key into the holes with the conductors.
This will release the clamp and the conductors can be removed.
Now, with a multimeter, check the cord for an open circuit. Prepare a new power cord if necessary. Reinstall the power cord in reverse order. 4. Defective power switch ... Check it and replace it with a good one if necessary. 5. There is no voltage in the socket ... Make sure that the protection on your shield has not worked. 6. The mower is not plugged in . 7. Blown fuse in the mower plug. ... If your lawn mower has a special. plug, it most likely has a built-in fuse. Disassemble the plug and ring the fuse with a tester. 8. The thermal protection of the mower motor has tripped. ... Some lawn mower models have this protection. It shuts off the drive if it overheats or if the mower blade is blocked by something.It's a good idea to check the mower's ventilation grilles for dirt. Clean them with a soft brush if necessary. The thermal protection will turn on the drive itself as soon as it cools down. This concludes the article on repairing lawn mowers. I also recommend reading useful posts jigsaw repair, refrigerator repair yourself. Success in troubleshooting!
An electric scythe or a trimmer, like any electric tool, has a limited service life. With an increase in the intensity of operation, for various reasons, the life of the device decreases.
You should be prepared that at any time during operation, the electric scythe can break, but such situations can be avoided if you regularly disassemble, inspect and revise all important elements of the scythe.
Malfunctions of electric scythes can be very diverse, it can be either a breakdown in the electrical part of the engine and wiring, as well as in the mechanical part.
In most cases, it is not difficult to repair a trimmer or scythe and you can do it on your own if there is a minimum tool and basic concepts in technology. Well, for the readers of the site elektt.blogspot.com, I will reveal the main faults and secrets for quick and reliable repair of your electric scythe, consider an example of repairing Bosch and Gardener electric scythes.
The design of most electric braids is not a complex device, the main components, be it a trimmer or braid, are an electric motor, a power wire, a button with a capacitor, a spool with a line that is fixed to the motor shaft or more complex mechanical options for braids where torque from the engine is transmitted to the spool through flexible shaft, but among electric options for braids, this option is rare.
To identify malfunctions of the electrical part, as a rule, only one inspection is not enough; you need a multimeter or at least a tester with a dial tone.
The check begins with the power cable, if it is damaged, it is either repaired or replaced.
The voltage should appear when the button is pressed, if the voltage is present, then we can safely say that the trimmer motor is faulty, it must be disconnected and carefully inspected.
Using a multimeter in the resistance test mode (the smallest limit is Ohms), touch the contacts of the brushes or the graphite brushes themselves with the probes, the tester should show a resistance of no more than 100 Ohms.
If the resistance is infinite (unit on a multimeter), then try to turn the motor shaft without removing the probes.
The following procedure can be used to identify the specific cause of a motor malfunction when the motor brushes are not ringing.
The collector motors in these devices are arranged in such a way that the stator and rotor windings are connected in series, and in expensive models of electric motors a thermal relay is also connected to this serial circuit (110 degrees), such a relay in normal conditions keeps the power contact closed.
To identify the culprit of the malfunction, it is necessary to remove the insulation in the form of cambric from the fluoroplastic where the windings and the thermal relay are connected and ring each winding separately with a multimeter, as well as the thermal relay itself.
The most loaded mechanical elements of electric scythes are bearings and a trimer reel (spool).
The line has run out. According to the instructions provided, you should wind the fishing line on a spool.
The line is tangled. If the reel has not received damage, then you need to cut or unwind the line and, if necessary, rewind the entire spool.
The line is stuck together. Due to the rather intense work and high overheating, the plastic lines of the fishing line can fuse with each other. It is necessary to rewind the spool with new line and inspect the damage to the bobbin itself.
The motor is running but the line spool does not rotate. Most likely, there was damage to the structure of the reel with line. The spool bottom attachment points can break off, you need to completely disassemble the bobbin and, if necessary, modify the mount or replace it altogether. In most electric trimmers, the bobbin is simply pressed by its plastic housing onto the motor shaft and, if overheated, when the plastic melts, it can turn and fly off altogether.
Both devices showed no signs of life, in the on state the engines did not work.
The case for both devices consists of two halves, the self-tapping screws are on one side, which is convenient for disassembly.
After disassembling, we proceed to inspect the insides and troubleshoot.
During the inspection, it was found on the engine trimmer Bosch , on one of the brushes, which is fixed by a pressure spring, a copper conductive wire flew off, which naturally was the reason for the absence of voltage on the brushes and the motor did not rotate.
The wire was restored to its place, and along the way the collector pads were cleaned, with a soft cloth soaked in alcohol, to a copper shine. The brushes were in good condition and did not need replacement.
It was also found that the switch does not create a reliable electrical contact, it was necessary to clamp the button with effort, it was decided to disassemble the button, its contacts were cleaned of carbon deposits and lubricated with KONTAKT S-61 current protective spray.
WITH electric scythe GARDENER it was not so simple, she lay for quite a long time in a broken state, and in the literal sense of the word “broken”, her rod at the engine casing was broken in half, apparently so difficult were the conditions of her operation.
With the help of perforated plates from the metal profile mountings, a new mount of the engine body to the electric braid bar was not cleverly made. The integrity of the structure has been restored, albeit not in aesthetic, but in a reliable way, because in an electric brace, its main function is its functionality.
The engine shaft was turning noticeably hard; an internal examination revealed burnt collector plates and worn brushes. The plates were sanded to a shine and the brushes were replaced with new ones.
In view of the long operation without lubrication and subsequent storage of the device in an aggressive environment, the bearings are a little stuck and the motor shaft rotates unnaturally with difficulty.
Further inspection of the electrical part led to the button, it was completely broken from its mountings, although it was pressed, but the tester showed its malfunction. The button is not collapsible, so it was replaced with a new one. The fasteners had to be restored with hot melt glue.
In addition to the broken bar, there was a crack on the plastic protection, apparently someone did not drop it weakly. The scythe could work with it, but it was decided, as far as possible, to restore the protection structure.
Naturally, simply gluing such a loaded and impact-prone object with glue would not be a reliable solution. Therefore, using the same perforated plates from the metal profile, two brackets were made that created a “monolithic” connection between the two parts of the cracked body.
When the brushcutter was assembled, it was found that the bar at the points of attachment of the handle was poorly fixed and rotated, therefore, the places where the plastic protrusions of the handle body were pressed against the metal of the bar were additionally sealed with a strip of cloth tape. Now the design has no extra backlash.
The spool (spool) runs out of line. In most spools, the net feed is semi-automatic, with a light hit of the spring-loaded button on the ground, the line is fed to the exit. If the line does not feed, then you need to remove and disassemble the spool - spool and, if necessary, wind new line.
The line may be too long due to the fact that the blade, which is designed for cutting excess line along the length, is dull or it does not exist at all.
A large hum and vibration during engine operation may indicate that the bearings need lubrication or they have completely used up their resource.
Most of the electric motors in the scythes and trimmers are collector-type and do not have a speed controller, with a decrease in the voltage in the network, the speed and power decrease.
Does the engine not turn? We look at the presence of power on the plug, if everything is in order, then the device needs to be disassembled.
Using a multimeter (tester), first ring out the power cord, the fuse, if there is one, and the button.
The cord may be broken, in which case the engine may intermittently start.
Some electric motors are equipped with a thermal fuse that is built into the motor housing and tripped from overheating or simply failed. A working thermal fuse must restore its operation when the engine cools down.
Repair of both gasoline and electric lawn mowers may be necessary at the most unexpected moment. We will tell you about the main breakdowns of homemade and branded equipment, tell you what to look for, and by what signs you can recognize a malfunction.
The lawnmower is a great alternative to the hand mower, making it easier and faster to cut grass in a wide variety of places, including those where a normal mow just won't turn. But behind the comfort and convenience lies a sophisticated modern mechanism that requires unremitting attention and regular maintenance.
Regardless of the manufacturer, all units have a similar design. Therefore, do-it-yourself Viking lawn mower repair is carried out in the same way as for other brands: Husqvarna, Shtil, Bosch, Gardena, Oleo Mak. A home-made lawn mower will not be an exception, but eliminating a breakdown requires basic knowledge. Consider the most common causes of engine failure, and do-it-yourself lawn mower repair in the field.
Regardless of the type of engine, the mechanical part of the scythe includes knives, a device for ejection or accumulation of cut grass and a transmission mechanism. Most often, knives fail or line ends.
Broken or bent knives are visible to the naked eye. Depending on the material and the degree of damage, the knives are replaced or restored by simply folding them back to their original state. With heavy wear, the cutting part can be sharpened. A do-it-yourself lawn mower from a trimmer can fail for many reasons. Most often, this is an excess of the maximum permissible torque and engine load, since a knife is used instead of a fishing line.
During inspection, check the condition of the grass supply duct into the container and, if necessary, clean it. More complex mechanical failures require a complex tool, special equipment, professional skills, and it is better to entrust the elimination of such malfunctions to professionals.
Not only factory, but also home-made electric lawn mowers fail. The main reason for stopping the electric motor is loss of contact and lack of power at the motor terminals.
Therefore, first of all, we check the presence of voltage in the power outlet, the condition of the electrical cord and the absence of its breakage. Then, if a collector motor is used, you need to check the condition of the brushes and replace them with severe wear. The brushless hand lawnmower offers increased durability, but requires regular brush replacement.
Asynchronous motor hand mowers also have problems. A phase-shifting capacitor often fails, but testing it in the field is problematic. An indirect symptom of a capacitor failure is:
jerking of the motor at the time of power supply;
strong heating of the engine even at low load;
reduced speed;
characteristic buzz.
Do-it-yourself electric lawn mower is made from scrap materials that can fail. If a malfunction is detected, in any case, you need to make sure that voltage is supplied to the motor terminals, and if it is absent, check the operation of the switch.
If there is voltage, the capacitor or brushes are in order, then the most likely cause of failure is a burned-out winding. In this case, the unit will have to be handed over to a repair shop. Home-made electric lawn mowers most often have to be repaired on their own, since when assembling the device, all the nuances of its work are not taken into account.
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Lawn mowers use gasoline two-stroke internal combustion engines. When deciding how to make a lawn mower with your own hands, they often use engines from other household devices - chainsaws, compressors, motor plows and trimmers. The process of finding and eliminating the problems of these engines is carried out according to one algorithm.Do-it-yourself gasoline lawn mower repair begins with determining the cause of the failure.
In this case, failure of the mechanical part is guaranteed or, as an option, its attachment to the motor shaft is destroyed.
A do-it-yourself mechanical lawnmower with a gasoline engine does not start well, but it works normally in operating modes (when gas is supplied). Such a malfunction can be caused by two reasons - a malfunction of the idle speed system in the carburetor or an incorrect fuel composition.
To eliminate it, you should start with fuel, combine gasoline and oil of the required brands in the required proportion and pour this fuel into the tank instead of the old one. If this does not help, remove and disassemble the carburetor and adjust the idle system in accordance with the manufacturer's instructions.
Most likely causes: clogged fuel jets, clogged fuel filter, clogged air filter. For elimination: jets are blown with compressed air, filters are changed or washed, depending on their design.
If the engine starts and runs at idle, but does not hold the load poorly during operation. Most likely, "oxygen starvation" takes place. Do-it-yourself lawn mower repairs are performed by replacing or cleaning the “blow-through” air filter.
It happens that, despite the presence and normal supply of fuel, the engine does not start. Most often, the absence of signs of life indicates a failure of the ignition coil. If, upon visual inspection, all electrical circuits are in order, then this coil will need to be replaced.
A less common occurrence is heavy carbon deposits or spark plug failure. It is determined by visual inspection of an unscrewed candle. The most effective way to determine this malfunction is to replace the spark plug with another one that is known to be working properly. When thinking about how to make a lawn mower if the engine does not start, pay attention to replacing the spark plugs with new ones, and preferably more reliable ones.
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Taking into account the peculiarity of the “field conditions” in which lawn mowers are operated, the manufacturers of these devices have tried to protect their consumers from possible problems as much as possible. But, as you know, even a manual manual lawn mower, made with your own hands, can fail one day. We really hope that our tips will help you in this case and will direct your troubleshooting in the right direction.
A reliable and simple tool for cutting grass in a garden area - a lawn mower, is extremely in demand. However, it can break. Repair required. Electric lawn mowers are usually repaired at service centers.
In order not to transport a sufficiently voluminous apparatus to the workshop, a number of faults can be eliminated with your own hands.
Why won't the lawn mowers start?
To answer the question, you need to understand that all breakdowns are divided into mechanical and electrical. The first include malfunctions:
To the second - everything connected with the engine, be it electric or gasoline.
It is not difficult to repair blunt knives on your own, since they are removable and you can sharpen them with ordinary emery, maintaining a sharpening angle of 30 degrees. In case of malfunctions of other parts, i.e. bodies, wheels, handles, they will also need repair or replacement.
In battery-powered devices, battery failure is added to this problem. It is more difficult to cope with the repair of a lawn mower equipped with a motor, i.e. gasoline and electric lawn mower.
In the first case, the problem of overheating and overloading, as well as malfunctions in the oil and fuel supply circuit, are added to possible breakdowns.Electrical breakdown can also be caused by overheating or overload, since not all models are equipped with protection.
Overheating is caused by prolonged operation of the device with an inadequate air filter, which makes it difficult for a sufficient amount of air to pass through.
You will have to cool the electric motor by disconnecting it from the power supply and replace the filter. In the future, in order to avoid repairing the electrical apparatus, it must be cleaned at least once every three months.
If there is an abnormal noise or odor, the electric lawnmower needs to be repaired. Not everyone will do it with their own hands, because the drive will need to be replaced.
Sooner or later, many are faced with the failure of the lawn mower. This happens, as a rule, after 3-4 years of active operation or after the device was stored in an unheated room in winter.
The mower is out of order if:
does not start;
the lawn mower stalls shortly after starting;
the engine does not run at full capacity or is intermittent
Problems with the engine appear over time in all devices, regardless of whether a simple "Chinese" or an expensive "Japanese" are on it. The moment is unpleasant, but you should not be upset, just as there is no need to rush to the service center. You can try to repair it yourself.
It is necessary to start repairs, guided by the principle "from simple to complex", i.e. it is recommended to start repairs by checking the presence of gasoline in the tank. If the gasoline device stops starting after wintering, the fuel should be replaced.
After all, the fuel, unfortunately, is not always of a decent quality. Consequently, during prolonged inactivity of the device, it may delaminate or form a deposit. And motors are sometimes very sensitive to the quality of fuel.
If there is no doubt about the quality of the latter, but the mower does not start, it is necessary to check the spark by removing the wire with the cap from the spark plug and unscrewing it using the supplied wrench.
Place the spark plug on a clean metal surface (without paint) of the engine, first putting the cap on it, and asking someone to jerk the starter.
If the blue spark does not appear, the plug must be replaced.
If an unstable and weak spark appears, the candle will need to be cleaned with a file or sandpaper.
They also change it if black carbon is found on the surface, regardless of whether it was formed due to poor fuel quality or an incorrectly tuned carburetor.
Another problem that is easy to fix is a clogged fuel hose. They check this by disconnecting it: if the fuel does not flow, then the filter or saloon is clogged. The filter will have to be replaced and the saloon can be cleaned with a needle.
It's good if the mower works after that. However, the cause of the malfunction in 90% of cases lies elsewhere - the failure of the carburetor, which will need repair. You can cope with the repair with enough experience. If it is absent, you will need the help of the service center.
You should start by checking that there are no open sources of fire nearby. Do not carry out repairs indoors. This is fraught with gasoline leakage.
We recommend:
Use a flat screwdriver to unscrew the screws to remove the plastic air filter cover from the motor. The removed filter is checked for clogging, cleaned with a vacuum cleaner or replaced with a new one (if the condition is unsatisfactory).
It is also necessary to remove the inner filter cover, which is located under the casing. This, by unscrewing the bolts, is easier to do with a spanner wrench. An air hose is attached to its inner side, which will also have to be removed.
Finally, we got to the carburetor of a device that can be dismantled. Disconnecting the fuel hose leading to it from the tank, i.e. removing the clamp, turn the hose, trying to remove it from the pipe.You need to do the work carefully. Indeed, if there is fuel in the tank, it will surely spill.
The carburetor is attached to the engine with two bolts, which require a union head to unscrew. When unscrewing the second bolt, try not to drop the carburetor so as not to damage the spring suspension.
The next step is to remove the return spring. It is more convenient to carry out the operation from the side where it is attached to the motor. Now you can remove the throttle cable by gently turning the carburetor counterclockwise.
After removing the carburetor, unscrew the bolt securing the fuel chamber cover.
Cleaning is carried out with a special liquid or WD-40 and copper wire, from which the insulation has been stripped.
Finally, you can remove the plastic float located under the chamber cover, which regulates the gasoline level, for which you first remove the pin.
The camera must be cleaned of plaque. The insides of the carburetor are abundantly moistened with WD-40 (or an analogue), wiped dry. After repeating the operations several times, they clean the fuel channels with the copper conductor, purge them, since their contamination is the main reason why the engine stalls or does not start.
After completing all the steps described, assemble the carburetor in the reverse order.
After installing it in place, connecting the hose, air is expelled from the fuel chamber. This completes the repair.
After the described manipulations, the equipment will start up easily and work stably.
If the electric mower is silent, the cause may be a power outage and a broken cord. To check if there is current in the network, use another electrical device plugged into the outlet. The cord must be inspected and replaced if a break is found. Disconnect it with a hexagon, and check for a break with a multimeter.
As is the case with gasoline lawn mowers, the cause of an inoperative electric motor can be overheating and overload (blocking of the element by a foreign object). The troubleshooting procedure is the same as described above.
Long grass can become entangled in the knives. For repairs, you need to disconnect the device from the network and turn the cylinder in the opposite direction.
If the electrical device is silent, the drive belt needs to be repaired as a result of wear: it can be stretched or broken. This means that you cannot do without replacement, for which you need to remove the protective cover.
The new belt is first installed on the small gear of the electrical apparatus, then put on the large pulley and turning it.
To replace the supply cable of this electrical device, it is necessary to de-energize the device and unscrew the cover.
To disconnect the cord, insert a hex key into the hole with the wires, releasing the clip.
Install a new power cord in reverse order.
The reason may also be in a faulty power switch, which is simply replaced with a new one.
If the engine worked, but suddenly stalled, you need to check the crankshaft and piston - they may have stuck. This is due to the lack of oil in the crankcase. With this breakdown, it is better to contact a specialist, as in the case when the electric motor of the lawn mower requires repair.
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Video: Lawn Mower Repair
For trouble-free operation of the mower, the owner must carry out regular maintenance after the end of the working season, i.e. before placing it for winter storage. It will cost less than repairing or buying a new electrical device.
Among the main measures for the reliable operation of the electric mower is keeping it clean. The mowed grass under the deck erodes the metal parts. A compressor or blower will help to remove the remnants of cut weeds.
The electric motor of the mower is air-cooled, therefore it also needs to be kept clean, which is the key to efficient operation.Use a soft brush and compressed air to clean the cooling fins.
Timely oil change, specified in the instruction manual, will guarantee long-term trouble-free operation, as well as periodic cleaning of the air filter.
With some experience, it is not difficult to repair lawn mowers with your own hands. The video below will help you with this.
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Video: How to Repair a Lawn Mower Engine
If the owner of an electric mower does not have sufficient knowledge, service centers will help to repair your favorite equipment that allows you to keep the area around the house in proper form, you can find out more about which on the sites:
Video (click to play).
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