A gasoline trimmer is a fairly simple and effective device for cutting grass. By design, it occupies a middle position between manual device, since it is supported by weight, and wheeled, since it is driven by an engine. It is used mainly in dachas and suburban areas, therefore, in the event of a breakdown, getting to a workshop or service center is not always possible.

Repairing a lawn mower yourself, if it does not involve replacing the entire assembly, is quite possible.

Device design

The essence of the device's operation is to transmit torque from a power drive - gasoline, electric or battery - to a cutting tool - a knife or fishing line. The transmission mechanism is a shaft located inside the rod. In devices with a curved shaft, its role is played by a steel cable.

The rod is attached to the drive gearbox - two- or four-stroke. When turned on, torque is transmitted through the shaft to the fishing line or knife.

The most complex part of the device is the motor. Damage to the shaft, belts, cutting tool are classified as mechanical breakdowns, but repairing the engine of a lawn mower usually causes difficulties. Some problems associated with contamination of engine components can be eliminated yourself. It is better to entrust replacement of spare parts or adjustments to a specialist.

Engine failure

The breakdown may not be associated with damage to the motor, but with the occurrence of obstacles in its operation. Before you begin disassembling, you should rule out simple breakdowns.

• Overheating - if a failure occurs after 15 minutes of continuous operation, then the reason is most likely due to elementary overheating. However, an increase in temperature may be caused by grass and dirt clogging the starter grill or cooling fins. A video of repairing a lawn mower demonstrates a method for eliminating the failure - cleaning the grilles and replacing the filters. The photo shows the filter being replaced.

• Gasoline – it’s not just a matter of it being present in sufficient quantity, but it was also of sufficient quality. Trimmers are fueled with AI-92 and it is highly undesirable to use gasoline with a lower octane number. It leads to rapid clogging carburetor, its rusting, and much more serious breakdowns.
• The air filter is dirty - cleaning it is part of the standard trimmer care procedures. At the dacha, the filter is washed with gasoline and installed in place. In more suitable conditions wash in water with detergents, dried and fixed back, after moistening it in the fuel mixture. In this case, repairing a Husqvarna or Shtil lawn mower is no different from troubleshooting a Chinese trimmer.

But if all of the above methods are used, then you will have to start disassembling the engine.

Replacing spark plugs

One of the most common causes of failure is contamination or damage to the spark plug - a crack in the housing. In the latter case, the spare part is simply changed.

1. The work is carried out with the engine turned off and cooled down.
2. The high voltage cable is disconnected.
3. The spark plug is unscrewed with a special wrench and inspected.
4. The presence of deposits on the spark plug indicates poor quality fuel. You can clean spare parts using white alcohol and brake fluid.
5. If the spark plug is faulty or damaged, it is replaced with a new one: inserted into place and tightened with a wrench.

In some cases, parts can only be used by the same model. But, for example, repairing a Shtil 130 lawn mower in 90% of cases allows you to replace new spare parts with old-style elements.

Starter breakdowns

The trimmer is started as follows: when the cord is pulled, the flywheel pawl engages with the teeth of the starter coil, and then, with a more vigorous tension, it starts the engine. If the launch is too sharp, the impact of the pawls leads to the destruction of the coil.

The second most common reason is a break in the flexible shaft when the coil gets jammed or when the grate becomes clogged with grass and dirt.

Do-it-yourself starter repair with a petrol mower eliminates the possibility. The module is sold as a finished unit and is simply replaced with a new one.

Lawn mower carburetor repair

1. First of all, the device is inspected from the outside for fuel leaks. Then the fuel hose is blown out, since often the cause of failure is its clogging.
2. If everything is in order, check the gasket between the engine and the carburetor and replace it if necessary.
3. A special device or a medical tonometer is used to check the tightness. If the pressure decreases, then the lawn mower requires carburetor repair.
4. As a rule, you can only disassemble and clean the device yourself. The module is cleaned with gasoline. The jet and channels are cleaned compressed air. If the blockage is very severe, use thin copper wire.

Setting up the device is a rather complicated procedure. If, after assembling and checking the carburetor, the trimmer starts, but immediately stalls, this is a sign of a failure in the settings.

Do-it-yourself repair of lawn mowers is shown in the video using the example of Husqvarna and Shtil machines.

An indispensable tool for a modern summer resident or owner of a private home is a lawn mower, which allows you to effectively and efficiently put the surrounding area in order. The period of active use of brush cutters is from late spring to October. Modern units are equipped with powerful and durable internal combustion engines, reinforced transmissions and main components. Despite this, physical wear and tear, manufacturing defects or improper operation lead to trimmer failure. In order to repair a trimmer with your own hands, you must have at least basic knowledge in the field of technology and some experience in its repair.

The main component of any gasoline tool is the internal combustion engine (ICE), which, through in various ways transmits torque to the executive body. In a modern lawn mower, an alloy rod (pipe) is used as a transmission element between the motor and the trimmer head, inside which the drive shaft is located.

Petrol trimmer Husqvarna

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

Cutting part of brush cutter

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

Trimmer cutting part

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

Made of durable polymer, during mowing it is subject to intense wear and, as a result, breakage. Therefore, from time to time it is necessary to check the presence of fishing line in the head and, if necessary, replace it. It is recommended to purchase an additional bobbin to quickly replace it with a reel that has run out of line.

Controlling a lawn mower

Types of lawn mower handles

Trimmers with internal combustion engines on the market today are equipped with a D-shaped, U-shaped or T-shaped handle, where the main controls of the unit are located. For example, on a U-handle braid, the throttle key and stop/start toggle switch are located on the right handle. In the D-shaped design of the handle, the gas adjustment key is located directly on the rod.

Trimmer malfunctions and how to fix them

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

1. The trimmer engine does not gain speed;
2. Failure of the cylinder-piston group (CPG);
3. Ignition faults;
4. There is no connection between the internal combustion engine and the trimmer head;
5. Mechanical knocks during operation of the unit.
6. Repair of CPG lawn mowers

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

Trimmer problems

Lubrication of rubbing units in a lawn mower is carried out by adding a certain proportion of oil to gasoline. This process can be disrupted due to old oil falling out as sediment. In this situation, when starting the trimmer, the motor overheats greatly and in a matter of minutes the most expensive breakdown occurs. To eliminate the malfunction, a complete replacement of the CPG will be required, namely: the piston, seals, cylinder and piston rings. If you are not an internal combustion engine repair specialist and do not have experience working with technicians, then it is unlikely that you will be able to fix the engine without the help of a specialist. You can find out more about the stages of repairing a piston trimmer here.

Trimmer ignition troubleshooting

When the ignition of a lawn mower fails, the spark on the spark plug disappears and, as a result, the fuel mixture does not ignite.

Spit spark plug design

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

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

Ignition flywheel with coil

If replacement check electrical circuit, did not give candles or her contacts positive results, then you should pay attention to the trimmer ignition module, namely the gap with the flywheel. Regardless design features and the manufacturer of the lawn mower, the distance between the ignition coil and the flywheel should be no more and no less than 0.2 mm. Recovery optimal value gap, you will need to loosen the coil mounting bolts and use a special measuring probe to set the trimmer ignition.

Gasoline trimmer fuel system

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

Components of the trimmer fuel system

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

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

Carburetor repair

If fuel enters the carburetor, it must be cleaned or adjusted. Adjusting the trimmer carburetor involves restoring optimal mixing of the fuel mixture.

Carburetor trimmer with adjustment screws

To do this, pay attention to three adjusting screws: maximum speed (H), minimum (L) and idle move(LA). To start setting, you need to completely tighten screws H and L and loosen 1 turn each. Then we start the scythe and let it warm up for 10 minutes to adjust the power system in operating mode. After warming up the internal combustion engine, press the gas button all the way (12,000 rpm). We restore the idle speed by unscrewing the LA screw. As soon as the trimmer head begins to rotate, you need to tighten the screw until it stops.

Gasoline scythe exhaust system

Trimmer Exhaust System

One of frequent malfunctions lawn mowers are caused by incorrect operation of the internal combustion engine, namely a drop in power when the speed increases (the scythe stalls).

The reason for this work is that the exhaust system is clogged with particles of burnt oil. Manufacturers often make mufflers prefabricated and cleaning is quite simple. If the design of the spark arrester is non-removable, then it must be placed in water with detergents, and then dried with a regular or industrial hair dryer. Frequent clogging exhaust system indicates non-compliance with the proportions of oil and gasoline.

Repairing lawn mowers with your own hands: breakdowns and methods for eliminating them was last modified: June 25th, 2018 by Administrator

In order to quickly cut the grass on the lawn, you need to use a lawn mower. But in order for the site to look beautiful and neat, you need to use a lawn mower. Using a fishing line or a cutter, which is used on a brush cutter as a cutting device, you can evenly cut the grass to any height. Moreover, the technique allows you to trim small branches of trees and bushes. Where a regular lawn mower is unable to cope with the work, a walk-behind mower helps a lot. Uneven areas, large grass, tough bushes - a gas mower can handle it all.

Modern brush cutters produced by global brands are distinguished by high functional characteristics. Having a lawn mower for the home and for public utilities is a necessity today. For example, to cut grass for hay, you need to have a brush cutter.

Gasoline-powered scythes are used for street work, for cutting grass. Even if a lot of tall grass and small shrubs have accumulated on the site for a long time, you can fight them using a lawn mower, which will create a neat appearance for the site. Very often, lawn mowers are used for non-standard work. For example, railroad workers often use this technique to remove grass that grows between sleepers.

Almost always a scythe becomes an assistant where another is powerless. But it also happens when a lawn mower, bought for a lot of money, just lies idle in the garage. For example, a person does not know how to use equipment correctly or how to start it. However, most often, if the gas scythe is not used correctly, the engine, blades and other parts fail.

In order to avoid such situations, our specialists will tell you how to properly operate the lawn mower. In general, equipment requires constant care and careful use.

Petrol mower device

The starter is manual, the engine is cooled by air.

Most often, brush cutters have two-stroke engines, but modern expensive models have four-stroke engines. power devices. A two-stroke engine is simpler in design, but it produces a lot of noise and a lot of burning, since the oil burns in the same chamber along with the fuel - gasoline.

A four-stroke engine produces more revolutions. When working with a lawn mower, you immediately feel the power and efficiency of the work. Vibrations are very weak and emissions are few. Such an engine is rightfully considered reliable; its service life is much higher than that of a two-stroke engine.

Two-stroke engines operate for a limited time. The instructions indicate how long you can work with the brush cutter before it needs time to cool the engine. As cutting material a fishing line or a metal knife is used.

In order for the mower to operate efficiently and long-lasting, so that the equipment does not require frequent repairs, you must follow the rules for using it. Violations of the prescribed rules are not allowed. Regular maintenance of the unit is important.

Even if you have never held a lawn mower in your hands, you will still not have any difficulties using it. Home work consists of rotating the lawn mower from side to side when cutting the grass.

In general, there are several types of grass cutting. For example, you can rotate the device from left to right while moving forward. There is a so-called square system, when a person with a lawn mower walks around a square. You can use it in any way, the main thing is not to violate the rules stated in the instructions.

When mowing, do not press the line against an area that has already been mowed. If you neglect this rule, the motor will be overloaded and the head will fail. To mow tall grass, you need to use fishing line. The string is kept parallel to the ground.

Of course, you should worry about the safety of your equipment. However, you should worry about your safety most of all. Before working with a lawn mower, you need to wear safety glasses, headphones, and a special suit that covers exposed parts of the body. Be sure to have tight shoes.

If stones and other debris are visible on the site, it must be removed. There should be no people near the work being carried out within a radius of fifteen meters.

Without gasoline as fuel, the lawn mower will not work, so it is recommended to use the fuel in the proportions specified by the equipment manufacturer. The mixture is considered correct when oil and gasoline are used for two-stroke engines. Motorcycle oil is not used in brush cutters, since there are no guarantees of high-quality engine operation. Only the highest quality gasoline is used for lawn mowers. IN proper storage High octane gasoline is also needed. Such fuel can be stored in metal containers for no more than one month. Otherwise, the quality of the fuel disappears, and oxidation of the container begins.

Before using a gasoline scythe under heavy loads, you need to run-in the engine. This way you can increase the performance of the motor. The fact is that during break-in, the engine elements rub against each other. During the test run you can easily learn how to operate the device. When using a gasoline brush cutter for the first time, you must follow the following rules:

• Do not let the engine run at maximum power for a long time;
• You need to constantly monitor the engine temperature;
• The lawn mower cannot be used until the engine is warmed up;
• after break-in, change the oil;
• it is forbidden to overload the engine;
• It is constantly necessary to clean the fuel filter, as well as the engine grille;
• Every ten hours of engine operation you need to clean the air filter;
• the tip on the tube is lubricated every twenty hours;
• It is forbidden to work with a dull knife.

Thus, you can use the brush cutter during break-in in gentle modes. This will extend the life of your scythe.

You can do it at home service maintenance brush cutters. So, the main element is the engine. the main problem, which occurs most often on lawn mowers, is a violation of engine compression. It happens that the engine jams, and the carburetor also becomes unusable. That's why you need to clean it all the time air filter.

Cutting elements should always be well sharpened. A file is used to sharpen a knife. It is important to observe the angles of the cutting surfaces when sharpening. Disc wear should be even. If the disc is dull, then the grass is not cut well, and this affects the operation of the engine.
On gas trimmers, fishing line is used as a cutting object. Do not use wire or cable. The fishing line must be made of durable nylon. The diameter of the fishing line should always be as specified by the manufacturer.

The head on a brush cutter always needs cleaning and lubrication. Used on lawn mowers bevel gear. For normal operation of the equipment, it also needs to be cleaned regularly. In order for equipment to last a long time, it must always have a protective cover. Not only that, it ensures your safety.

Repairing a lawn mower yourself is not the best thing that can happen. It happens that after the equipment is disassembled, it is not possible to reassemble it.

During work, there are breakdowns that you can quickly fix yourself. For example, if the power switch fails, then it needs to be changed. Where electrical equipment is sold, you can always find a toggle switch for a brush cutter. Often the head stop will fall off. You can always attach it to a barbell. Copper wire is used for this.

When a fishing line breaks, you can always buy a new one. You can use regular nylon or nylon fishing line until you buy the original fishing line. The line is wound onto the drum by hand.

Even if the rod is broken, it can be repaired. Strong vibration of the device indicates that the engine lacks lubrication. Disassembling the casing and filling in new oil will not be a problem.

If the engine often stops working, you can try closing the throttle, which will lead to a richer fuel mixture. It could also be that the problem lies with the spark plugs.

Trimmer malfunction:
The edges on the trimmer drive shaft licked (I had to buy a new shaft).

“Licked” because the shaft splines at the top are not engaged over their entire length (it happens that the shaft only engages a few millimeters at the end). At the bottom, the shaft enters the gearbox its entire length under its own weight.

At the first time The trimmer must be checked and made so that the shaft fits into the clutch at the top for the entire length of the splines (or edges, if they are square). To do this, try to put the gearbox higher on the pipe, having first loosened its fastening, or try to push the pipe deeper into the shock absorber, having first loosened its fastening. If the shaft splines still do not fit the entire length into the clutch, then you need to shorten the pipe (cut off a part) to the length necessary for the splines to fully fit into the clutch.

Warning: Just don’t overdo it with cutting the pipe (it’s better to cut off a smaller piece), because if the shaft turns out to be longer and needs to be cut, then when the shaft splines heat up, the metal will release, i.e. the hardened metal will become soft and will not last long (the shaft itself is made of alloy steel).

P.S. If the shaft has already been “licked”, then simply turn it over - install the shaft with the top splines down into the gearbox and do what is described in Do-it-yourself trimmer repair.

Trimmer repair: how to stop lubricant leaking from the gearbox

Trimmer malfunction:
Where does the lubricant go from the trimmer gearbox (Chinese trimmer, instead of a plug, a grease fitting and a syringe were screwed into the gearbox).

Cause of trimmer malfunction:
Solid oil under pressure pressed through the sealed bearings of the gearbox. During operation, liquid hot lubricant, driven by rapidly rotating bevel gears (in a small volume of the gearbox housing), “flies out” either into the drive cartridge if the sealed bearing rings on the driven shaft are pressed, or upward into the pipe body if the sealed bearing rings on the drive shaft are pressed gearbox

Replace the bearings (or the entire gearbox) at a service center and then use a special lubricant for the trimmer gearbox (for example, Husqvarna).

Advice: Chinese lawn mowers have small hole to add lubricant to the gearbox, so it would be more convenient to take the lubricant from a branded tube into a medical syringe (without a needle), and then add lubricant from it to the gearbox.

Repair of trimmer Husqvarna 333R

Husqvarna 333R for 3.5 seasons of active commercial operation (required replacement):

Note: I read somewhere that the time between failures of two-stroke engines is no more than 500 hours, and in 3.5 seasons I burned ~370 liters of gasoline, i.e. if 0.35 l. per hour, then the operating time is already more than 1000 hours! The Husqvarna 333R trimmer is a very reliable trimmer (petrol mower).

Note: Please write in the comments what you think about this trimmer repair.

Petrol trimmer repair: how to replace gearbox bearings

Trimmer malfunction: Tell me how to disassemble the gearbox on the trimmer to replace the bearing (Husqvarna). And does he even understand?

Answer: The Husqvarna trimmer gearbox can be disassembled to change spare parts such as bearings, bevel gears, housing (since the assembled gearbox for a Husqvarna trimmer costs about $150.)
You need to remove it by loosening the tightening bolts at the bottom, be sure to wash it (for example, with gasoline), then use round nose pliers to bring the ends of the locking spacer ring together (there are two of them on the gearbox) and pull out the bearings with a small puller. They should go easily, since the upper bearing is no longer pulled together by the housing, and the drive shaft of the Husqvarna trimmer comes out of the lower one.

Trimmer repair: how to restore the thread in the spark plug hole of the cylinder

Trimmer malfunction: The spark plug is very difficult to screw in.

Cause of malfunction: The thread in the spark plug hole of the cylinder is damaged due to the fact that the spark plug did not follow the thread when screwing it into the cylinder, or sand got on the threaded part of the spark plug, or the thread was torn off by a large force on the key.

If the spark plug is not screwed in deeply, then you can drive the threads in the cylinder with a tap of the appropriate size, then screw in a new spark plug and tighten it with a force of 32-33 N*m. If the spark plug does not turn, then everything is fine, but the next time you turn the spark plug out, you need to be especially careful. If the spark plug turns, you will have to install a bushing (repair sleeve). To do this, it is better to contact a chainsaw repair shop and petrol trimmers. There is necessary tool and qualified personnel to select and purchase (or manufacture) a spark plug repair bushing suitable for your spark plug, then properly disassemble the engine, drill the spark plug hole to the exact required diameter, and cut the appropriate threads in the cylinder. Then rinse everything and blow off any chips, screw the spark plug into the bushing, apply thread sealant to the threads of the bushing or cold welding, screw the spark plug together with the bushing into the prepared hole, dry it, assemble everything, start it and adjust it. Another option is to replace the engine cylinder. Repairing a lawn mower yourself is similar to repairing a trimmer.

Advice: The main thing when installing a spark plug is that you first need to tighten the spark plug a few turns BY HAND, and then take the key. If the spark plug comes out easily by hand, it means it is installed correctly and can be tightened with a tool (a spark plug wrench with a knob). If the spark plug does not want to be twisted by hand, you should not tighten it with force with a wrench, since the spark plug has gone the wrong way and the threads in the spark plug hole of the cylinder will inevitably be damaged and an expensive repair of the trimmer engine will be needed.

Repairing a lawn mower: how to cut and change the gasket under the carburetor

Trimmer malfunction: A cold trimmer engine with a closed carburetor air damper starts almost normally, operates at elevated idle speed, when the engine heats up, unstable operation is observed, after which the trimmer engine suddenly stalls. The malfunction of a lawn mower is the same as that of a trimmer.

Cause of malfunction: Air leakage under the trimmer carburetor gasket due to loose carburetor mounting or frequent removal/installation of the carburetor.

Make a new trimmer carburetor gasket from thin paronite (up to 0.8 mm thick) or thick cardboard. How to make a carburetor gasket: cut out a piece of thin paronite or thick cardboard a little larger than the future finished gasket, spread seat on the cylinder or carburetor with oil or grease, carefully apply the prepared piece for the gasket so that a clear imprint of the grease remains on it (the outline of the future gasket). Then cut out the middle with a small sharp narrow chisel on a heavy metal lining (for example, an anvil), cut out the holes with a special head from a set of suitable diameter, and cut the outer part with scissors. As an option, apply paronite or cardboard to the cylinder seat, just do not move it, tap the edges with a mallet, and knock out the holes with a ball from the bearing, but there is a risk of damaging the edges. The first option is how to make the carburetor gasket better. That's it, the trimmer carburetor gasket is ready. Repairing a lawn mower with your own hands in this case is similar to repairing a trimmer.

Trimmer repair: how to replace gears and bearings in the trimmer gearbox

Trimmer malfunction: Trimmer gearbox - hum, grinding, squeaking and other noises in the lower part of the trimmer, jamming when turning and the driven shaft is loose. The malfunction of a lawn mower is the same as that of a trimmer.

Cause of malfunction: The trimmer gearbox bearings have failed due to overheating of the gearbox, lack of lubrication in the gearbox housing, impact of the trimmer knife on a stationary object, and long-term (many years) active use.

Replacing the bearings in the trimmer gearbox yourself (you need keys to remove the gearbox; pliers to remove the retaining rings and disassemble the gearbox; gasoline to wash all the insides to troubleshoot the parts; new trimmer gearbox bearings for replacement) or replace the gearbox bearings in a workshop. If only one trimmer gearbox bearing is destroyed, both bearings still need to be replaced. Or, as an option, replacing the trimmer gearbox assembly - select the gearbox to match the diameter of the pipe onto which it will be clamped and along the splines drive shaft(square, star, hexagon). Repairing a lawn mower yourself is similar to repairing a trimmer.
PS: After replacing the bearings in the trimmer gearbox or replacing the gearbox assembly, do not forget to fill the gearbox housing with grease (you need a good lubricant, for example Husqvarna) through a special hole in the gearbox housing from a tube of lubricant or from a syringe (without a needle) if the filling hole is very small.

Repairing a lawn mower: how to restore functionality to a broken starter spring

Trimmer malfunction: When trying to start the engine, the trimmer starter cord stopped returning to the starter housing. The malfunction of a lawn mower is the same as that of a trimmer.

Cause of malfunction: The end of the spring in the trimmer starter jumped out and the pulley jammed.

Disassemble the starter, drill a hole where there is a recess to fix the end of the spring, thread a wire, insert the spring, lay one turn, tie the wire thus fixing the spring end that has jumped out, lay all the turns of the spring, bend the end of the spring inward to engage with the groove on the other part. Then place the washer, spring, part with two antennae, tighten the central screw, insert the cord through the hole, tie a washer at the end to secure the end of the cord, lay the cord, check the operation of the starter and the return of the cord to the trimmer starter housing. Repairing a lawn mower yourself is similar to repairing a trimmer.

Trimmer maintenance using the Husqvarna 333R as an example to prevent trimmer repairs

THAT. We use trimmers (gasoline mowers) to:

• in the heat and under any load, the trimmer engine did not overheat;
• ensure precise adjustment of the carburetor and, accordingly, optimal operation of the lawn mower engine;
• identify possible defects, fuel leaks and other malfunctions in order to avoid trimmer repair;
• promptly change the spark plug, unreliable bolts, gaskets and other consumables;
• so that the trimmer (mower) has a good appearance;
• so as not to take the trimmer to a service center.

THAT. We carry out the Husqvarna trimmer after rolling out every 40 - 60 liters. gasoline

(depending on heat, dust and severity of work).

Servicing the trimmer air filter

I wash the air filter after the engine is rolled out every 20 liters of gasoline and before repairing the trimmer or servicing the trimmer.

To service the air filter you need to: remove the foam element of the air filter and wash it with soap and water in a clean and warm water, squeeze and dry (or replace if the foam filter element is old or damaged).

Note: The air filter can be “washed” more often to prevent a drop in power, increased consumption fuel, starting difficulties, as well as unnecessary wear and tear on the lawnmower engine.

Note: If you adjust the trimmer carburetor with a dirty air filter, then after cleaning the air filter, more air will enter the engine and the fuel mixture will become much leaner, which will lead to bad work or even engine breakdown and, as a result, trimmer repair.

Preparing for trimmer maintenance and repair

• provide (purchase and dilute) the usual fuel mixture for the operation of your trimmer (for example, A-95 “Mustang” gasoline from a WOG gas station and Husqvarna two-stroke oil, in a ratio of 1:50) and leave 1.5 liters of clean (without oil) gasoline for washing engine parts;
• buy a new spark plug: only Champion RCJ6Y - according to the manufacturer's instructions Husqvarna;
• prepare water-washing supplies for T.O. and trimmer repair (~7);
• prepare petrol-washing supplies (~5);
• buy the necessary Husqvarna bolts and screws to repair the brush cutter (new fasteners);
• prepare thin paronite for the gasket under the carburetor of the trimmer, round fishing line 2.7-3 mm, gear lubricant, clamps, fuel filter;
• provide good lighting, cleanliness of the room and workplace for trimmer repair (baking tray for laying out parts and spare parts, stand for the motor, lining for keys and tools);
• ensure personal performance (if necessary);
• allocate one free day specifically for maintenance and repair of the trimmer (petrol mower).

Beginning trimmer maintenance and repair

1. Add grease to the trimmer gearbox. Remove the metal blade or trimmer head and clean the driver cartridge inside of any grease and soil.
2. Wash warm water and brush everything on the steering wheel, everything on the bar and both protections (the protections of lawn mowers, as a rule, become heavily “overgrown” with a dried mixture of soil and grass juice, so it is advisable to clean the plastic protections with a metal brush, and then with washing powder and a brush. Rinse everything and dry.
3. Inspect everything on the trimmer for cracks, bends, abrasions, distortions, tears (especially metal blades at the base of the teeth and at the holes and both protections). Reliably eliminate all faults identified on the brush cutter. Remember! – the thickness of the metal is calculated on a computer, therefore tightening of fasteners should only be carried out in a service center according to special card tightening fasteners with a torque wrench. If you do the tightening of the fasteners yourself, then do not overtighten!, since when strong heating(for example, a gearbox) in hot weather with a heavy load, the metal expands, but there is little thickness reserve and the housing may burst (crack).
4. Install trimmer head (T-35) with 2.7 mm or 3 mm cord standard length(to the cutting knife in additional protection) to load the engine to adjust the high speed needle, that is, the left carburetor trim screw.
5. Rinse and drain the fuel from the tank into a bottle.

Disassembling the Husqvarna 333R trimmer (procedure for disassembling the engine for maintenance and trimmer repair

1. Remove muffler cover- one bolt.

2. Turn the trimmer over on the table and remove metal pan (three screws).

3. Remove block starter(this is the air intake of the trimmer engine cooling system) - three screws and two rubber bands!

4. Unfasten the air filter cover and remove cylinder cover(she directs cold air per cylinder) – one bolt.

5. Unscrew the three bolts in air filter housing(one short and two long).

6. Carefully disconnect throttle cable from the carburetor.

7. Inspect so far everything is dirty - the carburetor on the trimmer and its gaskets, hoses, tank, plug for fuel leakage (cracking and leaks).

8. Remove fuel tank with two hoses (disconnected very carefully with a screwdriver) and four support rubber bands (do not lose them).

9. Remove carburetor Zama C1Q complete with air filter housing and gasket.

10. Use a screwdriver to remove choke button(you need to make a mark there for subsequent installation).

11. Turn the carburetor on the trimmer, remove it from the air damper rod on the body and then from the other rod.

12. In the new spark plug Champion RCJ6Y (for Husqvarna) set the gap to 0.5 mm.
Unscrew the old spark plug and install a new spark plug into the trimmer cylinder!
(the old candle - either throw it away immediately, or clean it, set the gap and prepare to wash it in order to hide it in storage).

Note: Due to carbon deposits on the spark plug electrodes: interruptions in engine operation occur (the trimmer engine malfunctions), a drop in power occurs, and the engine may not start easily.

Note: Carbon deposits on the electrodes of the spark plug are formed due to improper adjustment of the trimmer carburetor, if there is a lot of oil in gasoline and when the air filter on the trimmer is dirty.

13. Disconnect shock absorber cap(two side screws).

14. Disconnect barbell from the motor (three end bolts).

15. Remove from the front clutch cover(three end bolts) and inspect the condition of the drum, bearing, clutch spring and weights (check for wear). If necessary, replace it at a Husqvarna dealer, or disassemble it for washing.

16. Disconnect throttle cable(in two places).

17. Separate from clamp and stack spark plug wire and wires to the “jammer”, and disconnect jammer wires on the trimmer motor.

18. It is not recommended to disassemble further, as the factory ignition setting will be disrupted! (let me remind you: our task is only maintenance and repair of the trimmer). Muffler and intake panel It is not recommended to remove it (just check the fasteners!), so as not to break the tightness of the intake/exhaust and to prevent dirt from getting into the cylinder when washing.

19. Loosen one bolt and remove shock absorber from the pipe. Wipe the seat on the pipe dry. Remove the shock absorber cover.

Note: I removed the spark-extinguishing mesh in the muffler to prevent possible overheating of the trimmer engine due to the mesh being clogged with carbon deposits.

Safety precautions: Sparks may fly from a muffler without a spark-extinguishing mesh.
Caution! Do not work where there is dry hay, gasoline or other flammable materials.

Washing trimmer engine parts

20. Prepare at T.O. and trimmer repair:

• photo.bath (empty and clean);
• 1.5 liters of pure gasoline, no oil! (to pour 0.7 liters into the bath twice);
• a narrow brush with long, hard bristles;
• a pump with a purge tip (or a compressor with a receiver);
• large clean rag.

21. In order, wash with gasoline, blow out (!) and wipe painted surfaces with a clean (!) rag, including bolts and rubber bands (5 of them):

• trimmer air filter cover and rubber band;
• carburetor Zama C1Q (with partial disassembly and checking the holes with a thin copper wire);
• carburetor and air filter housing, quickly(!), since gasoline dissolves some types of plastic;
• the tank plug, especially the holes and the tank itself (if necessary, remove it with a hook from a bicycle spoke, remove the fuel filter from the tank and replace it);
• cylinder cover;
• trimmer starter block;
• coil wires on the shaft tube;
• Wrap the spark plug cap in cellophane and place it on the spark plug (then wipe with a dry cloth).
• Thoroughly wash and blow through the disassembled engine (carefully!, as gasoline corrodes the plastic parts of the ignition coil), especially carefully wash the entire engine cooling system!, to avoid overheating during extreme conditions trimmer operation;
• old spark plug (clean first, if there is one) and put it in storage;
• shock absorber and shock absorber cap;
• disassembled trimmer clutch;
• clutch cover;
• aluminum tray;
• muffler cover;
• wash the bolt heads and rubber bands (there are 5 of them);
• Wash the tray and brush in the remaining gasoline, wipe and hide.

22. Repeat paragraph 21 (selectively).

23. Wash your hands.

24. Inspect all wires and clean connections! (there are three of them?).

25. Open the trimmer throttle handle in half, disconnect the throttle cable and use a pipette to drop oil into the cable casing from both sides of the casing, constantly moving the cable to lubricate it. Clean and reassemble the throttle handle.

The procedure for reassembling the engine when so and repair of Husqvarna 333R trimmer

Note: I will be grateful to everyone who expresses their opinion in the comments about T.O. and repair of a Husqvarna trimmer (or compare with that and repair of a trimmer of another brand).

Trimmer repair is necessary when the device does not turn on or functions incorrectly. All owners of private houses and suburban areas are familiar with the problem of excessive vegetation, which is sometimes difficult to get rid of. As you know, progress does not stand still and new developments and useful inventions appear in all areas. This also affected Agriculture. You no longer need to mow the grass with old, inconvenient devices; modern gas mowers have come to the rescue, capable of getting rid of vegetation in the most inaccessible places.

With a gasoline trimmer you can mow the grass even in cloudy weather. look after personal plot Using this unit is very simple, and any adult man can cope with this activity.

Despite their versatility, like any equipment, trimmers tend to break and fail.

Not everyone can do the repair of a lawn mower with their own hands, because this requires repair skills electrical appliances, but today we will try to figure out how to start a trimmer without a starter and how you can generally debug its operation with your own hands.

Trimmer breakdowns and methods for eliminating them

Do-it-yourself trimmer repair involves eliminating all problems that interfere with the normal functioning of the unit. Among the most common are the following:

• breakdown of the CPG (cylinder-piston group) of the engine;
• the trimmer fails when trying to increase the operating speed;
• ignition coil failure;
• there is no connection between the motor and the gearbox;
• there are extraneous sounds during operation;
• the engine cannot reach the required speed.

Failure of the engine's CPG can occur due to low quality fuel or wear and tear of engine parts. As you know, the piston group is lubricated thanks to the oil that is added to gasoline. In old oil, the lubricant precipitates out, which makes the oil unusable. If you continue to try to start the trimmer, you can ruin the motor in a matter of seconds, and this will entail additional expenses for trimmer repair. This breakdown is considered the most expensive. To eliminate it, it is necessary to replace the piston group assembly; to be more precise, it may be necessary to replace the cylinder, rings, piston and seals. In such cases it is unlikely to be possible without additional help, unless you yourself are a master and know how to handle such equipment.

You can repair a lawn mower yourself if it starts and idles, but then chokes when you try to increase the operating speed. To eliminate this breakdown, carburetor repair or cleaning of the muffler or gas filter is required. At first glance, everything can be solved quite simply, but if after you clean the clogged parts of the trimmer, it does not work, then additional diagnostics may be required.

Replacing the ignition coil

The main sign that the ignition coil has failed and trimmer repair is required is the absence of a spark at the spark plugs. In this case, it is very important not to rush to replace the coil; in most cases, the cause of the breakdown is a lack of contacts, a switch button that may have broken, or a problem in the spark plug itself. It definitely needs to be checked, perhaps there is current flowing somewhere or there are gaps or carbon deposits.

If the trimmer motor cannot reach the required speed, then it is likely that the air filter is clogged or there is debris in the motor itself. The solution to the problem is immediately clear - clean the engine and filter; in some cases, replacing the filter may be necessary.

Knocking and extraneous noise

During operation, most trimmer users encounter constant noise. If you hear a characteristic knocking sound, as if on metal, then it is likely that the engine in the trimmer is overheated or fuel is not passing through. To eliminate this sound, you need to add gasoline or turn off the mower for a short time.

You should not wear out the unit: if it constantly works for wear and tear, its service life will be shortened several times. If a knock is felt in the engine itself, then the cause lies in a malfunction of the piston, piston ring, worn cylinder or crankshaft bearing. To make the knocking noise disappear, you need to replace the failed part in the trimmer.

Sometimes it happens that the motor in the trimmer works normally, but the output shaft rotates very weakly or does not rotate at all. This is reflected in the fact that when the trimmer touches the grass, it stops working altogether and turns off.

To restore normal operation of the mower, you need to check 3 main components, namely:

• bushing;
• output cup;
• flexible or rigid shaft.

The gearbox is a very important component, so repair of the trimmer in this case should be carried out by an experienced technician, and to prevent similar breakdowns from occurring in the future, the gearbox needs to be properly maintained.

Other common breakdowns

In addition to the above breakdowns, other failures also occur, for example, the power button sticks or the limiter falls off the mowing head. You can replace the power button using a soldering iron, and the limiter can be wound using copper wire. Have you noticed that the fishing line has broken or run out? It is enough to buy a new skein of the same diameter of fishing line and, having disassembled the drum, wind it onto the bobbin.

If you want your mower to work for a long time and without interruptions, then it requires constant maintenance, you can contact service centers or carry out diagnostics yourself.

To do this, you need to constantly check the rod bushings and change them if necessary, the same goes for the spark plug.

You constantly need to fill the gearbox with special lubricant, partially disassemble the motor part and clean it of accumulated dirt. In most cases, such trimmer maintenance is carried out according to a certain number of hours worked.

Now you are a little familiar with how to repair gasoline trimmers without additional help. But it is worth noting that if you are not confident in your knowledge and skills, it is better to leave this matter to the professionals.