Features of maintenance and self-repair of Husqvarna brand chainsaws

There can be many breakdowns associated with a chainsaw, and some can be quite difficult to solve. If you have been working with this gas-powered tool for a long time, you have had a problem when gasoline does not enter the carburetor or it does, but it is very difficult and does not allow the chainsaw to start normally. Fortunately, experts long ago found the causes of such a breakdown and therefore we have compiled the main repair methods.

First of all, we check for trivial reasons, for example, the presence of gasoline in the tank. If there is one, we check the process of fuel supply from the tank through the wire. To do this, just disconnect the gas line from the carburetor and try to pump fuel. It is correct to supply fuel through the hose in jerks, this will make sure that there are no problems with the gas tank. If the fuel does not flow even jerkily or drips too slowly, the reasons may be the following:

The fuel filter is clogged with dirt and dust;

The gasoline supply channel is dirty.

Surprisingly, even having a full tank can cause no fuel to flow. Therefore, try not to fill the tank to the maximum. An overfilled fuel tank can press out the tube that connects to the carburetor.

Poor quality gasoline

Every experienced chainsaw user knows that fuel cannot be left in the tool tank for a long time. The fact is that during long-term storage, unnecessary processes will occur inside the tank with the formation of resin and polymerization of various components. Do not leave fuel in the tank for more than 2 weeks, and even if your tool starts on such fuel, this can lead to the formation of carbon deposits on the CPG parts (rings, piston).

Air filter

If the chainsaw does not supply gasoline to the carburetor, pay attention to the type of air filter. Due to its improper operation, the chainsaw begins to operate unsteadily, which subsequently becomes difficult to start or stalls during operation. It is more difficult for air to enter the device and makes the mixture too rich. You are unlikely to be able to start it, and the reason for this is the formation of dust.

You need to remove the air filter carefully, because if dust is stored on it, it can fall onto the carburetor. The air filter can be cleaned well with water and detergent. Be sure to dry the filter before installing.

Chainsaw engine malfunction

Signs of a chainsaw engine malfunction:

– the engine does not start – the engine runs unsteadily – the engine starts, but very often stalls – the engine quickly overheats – the engine runs normally at idle, but “chokes” under load – the engine smokes heavily, power drops
In certain situations, it is better to seek help from professionals , and take your saw to an authorized service center. But you can deal with some problems yourself.

In general, in order to eliminate the cause itself, you must first correctly identify it, otherwise the entire repair will be tantamount to shooting at sparrows from a cannon, and perhaps even shooting at “fictional” sparrows, since there may not be any breakdown.

If you are trying to start a chainsaw, but it does not start, and at the same time does not make any strange sounds that are not typical for it (knocking, grinding), then you are simply starting it incorrectly (if you pull the chainsaw on the choke for a long time, the internal combustion engine is filled with fuel, and then start its difficult).

How to start a cold engine correctly? 1. Set the lever or switch to the “flap closed” position. 2. If the model is equipped with a fuel priming pump, pump the fuel mixture into the carburetor. 3. Pull the starter handle until resistance appears, then vigorously pull in amplitude, moving your hand to the side (2-3 times). No need to try to “rip” the starter cord out of the chainsaw! The saw should start and then stall. 4. If the engine does not start, move the lever to the half-throttle position or to the working position, and try to start the chainsaw in this mode

Please note: some models have a push-button ignition switch, make sure it is turned on

What to do if the engine still doesn’t start? First, unscrew and inspect the spark plug. It happens that when starting a chainsaw in cold weather, the combustion chamber is accidentally filled with fuel mixture. In this case, you should also unscrew the spark plug, dry the combustion chamber by idling, clean the spark plug, and try to start the saw again.

How to check for spark on a spark plug? Place the unscrewed spark plug connected to the high-voltage wire on the cylinder and pull the starter. Be careful! You cannot touch the candle with your hands during this procedure! If you see a blue spark, the spark plug is OK. We screw the spark plug into place and try to start the saw again. If we fail again, we’ll check the connection of the high-voltage wire to the spark plugs, the coil and the ignition system.

Based on the state of the spark plug, you can understand what happened to the saw:

• Dry candle. Apparently, the fuel mixture will not get into the cylinder. The problem is not in the spark plug, so we screw the spark plug back in. And we check the fuel supply system.
• A wet, heavily fuel-stained spark plug. The reason for excess fuel is hidden either in violation of the model factory rules, or in incorrect carburetor adjustment.
• The candle was covered with black soot. This may indicate the use of low-quality oil (so use only original oil for your saw), an incorrectly adjusted carburetor, or an incorrectly prepared fuel mixture. The spark plug needs to be washed, thoroughly cleaned of carbon deposits with an awl or a needle, the electrodes should be wiped with sandpaper and screwed into place.

When checking the spark plug, pay attention to the gap between the electrodes (it should be 0.5 - 0.65 mm). A worn gasket must be replaced

Prerequisites for failure of the accounting ignition system

Read:

If the Husqvarna saw has stopped working , then you mainly need to check the spark plug for functionality. This must be done very carefully using a specially designed hook. First, the wires are disconnected from the body of the floor, and look at the type of candle.

1. If the spark plug is dry, then this means that fuel simply does not enter the main cylinder. Under such circumstances, the fault is not in the spark plug, so it can be safely screwed back in.
2. When fuel splashes occur on this part, the main problem lies in the carburetor. This indicates that it was incorrectly adjusted or the start rule was violated.

Do-it-yourself Partner 350 carburetor setup

Before starting adjustment work, it is necessary to clean the main fuel unit from dust and dirt. To do this, you can use a compressed air compressor or a carpentry brush.

To adjust the carburetor, there are holes on the left side of the power unit, but to make it easier to determine their position, experts recommend removing the protective plastic casing. First, tighten the fuel quantity and quality screws all the way clockwise, then loosening them by 1/5 ... ¼ turn.

Partner 350 chainsaw carburetor with adjustment screws

With the cover removed, you need to know that the fuel mixture quality screw is located on the right and, accordingly, the gasoline quantity adjustment screw is located on the left. For convenience, the carburetor body is marked under the bolts:

— “L” — fuel quantity screw (adjustment at low speed);

— “H” — mixture quantity screw (setting at maximum speed);

— “T” — idle speed adjustment bolt.

It is necessary to remember that the carburetor adjustment of the Partner 350 chainsaw must be done on a warm engine. At high temperatures, the metal expands linearly, as a result of which the throughput of the channels increases.

As soon as the cylinder becomes warm, tighten screw “L” until the internal combustion engine produces maximum crankshaft speed. Then tighten it a quarter turn. It is worth noting that in this position the mixture supply quantity screw should maintain the engine running at idle speed. If this setting is not enough, then feel free to unscrew the “T” bolt until the engine runs stable. Using screw “H” we adjust the operation of the Partner chainsaw at maximum speed.

Diagnostics of crankshaft bearings

An important factor in the correct operation of the engine is the bearings and seals of the crankshaft.

Crankshaft Partner 350 with bearings

To diagnose their wear, it is necessary to shake the flywheel mounted on the shaft in the vertical and horizontal plane. If there is obvious play, the rolling bearings must be replaced. If there are oily marks on the crankcase, the seals will also need to be replaced. It would be a good idea to check the crankshaft play of the Partner 350, for which we remove the cylinder and piston. Using our hands, we shake it left and right, thereby imitating natural movement.

No. 9. The chain does not rotate

Why does the chainsaw chain not rotate when the engine is running, even with the throttle fully open?

• Leading sprocket. Either it is jammed, or the front sprocket is so worn that it does not engage and the chain does not spin on the chainsaw. In any case, it is necessary to disassemble the sprocket to find out the exact reason why the chain does not turn. If the crown is worn, the gear (or the crown itself, if the gear has a prefabricated structure) must be replaced).
• The chain brake is locked. As a result, the sprocket is blocked by the brake mechanism when the engine is running. Stop the engine and release the brake. If this happens under load, the brake mechanism will need to be replaced, as well as the sprocket, since high temperatures can melt and overheat many elements.

If you have any questions, watch the video collection

How to adjust the carburetor of a Stihl chainsaw.

Features of launching Chinese chainsaws using the Hunter chainsaw as an example. A detailed story and demonstration of carburetor repair, as well as its adjustment.

In a chainsaw, a lot depends on the carburetor: stable operation regardless of speed, power of the tool, efficiency of use, fuel consumption. In addition to the fact that the carburetor needs to be monitored, it must also be properly adjusted for the chainsaw to function properly. Setting up a carburetor on a chainsaw, like on any other machine, is a very complex matter, and it requires a thoughtful approach and following instructions. But if you strictly follow all the necessary instructions, then almost anyone can adjust the carburetor, and it must be done at the first sign that the chainsaw is not working properly.

How to flush a chainsaw carburetor?

To clean the unit from heavy contamination, it is best to use a product that is sold in pressurized cylinders. The cleaner comes with a dispenser and a long thin tube, which makes it possible to spray the product in any hard-to-reach places.

It must be remembered that cleaning the carburetor on a chainsaw is done using flammable chemicals. You need to work with them wearing a special protective mask and only in well-ventilated areas.

Read also: How to use an oil filter chain puller

To clean the carburetor on a chainsaw, the unit will need to be partially disassembled. The throttle valve, adjusting screws, body and other parts of the carburetor will need to be washed with the product from the bottle and set aside until completely dry. Once all the elements are dry, the assembly can be assembled and installed back on the chainsaw.

What to do if the Partner 350 chainsaw does not start

Now that you know what caused the breakdown, it's time to get down to business. A faulty ignition system can only be repaired after disassembly. To do this, remove any remaining fuel from the tank. Then carefully disconnect the wire and remove the spark plug (a special key is provided to remove it).

1. Test it to see if it works. To do this, place the ignition cable on the spark plug, and connect the spark plug nut and cylinder using pliers. Now start the starter. Is there a spark? This means the spark plug is in working order. No spark? This means that it will not be possible to revive the spark plug, and it must be replaced. What can you do with a working candle? Already by the appearance of the spark plug one can judge the repair method.
2. The candle is completely dry. This means that it is not wetted by the fuel mixture. The problem must be looked for at the stage of fuel entering the cylinder, it is disrupted. The spark plug and the ignition system as a whole have nothing to do with it. Reinstall the spark plug and look for the real cause of the problem.
3. The spark plug is overfilled with fuel mixture. The first thing, of course, is to wipe it with a napkin and put it aside. Now you can look for the cause in incorrect carburetor adjustment. While the spark plug is air drying, you can shut off the fuel supply and turn on the starter to check the combustion chamber. After a few minutes, the spark plug can be replaced in its place in the mechanism and the chain can be restarted.
4. The candle is covered with a layer of soot. Burning occurs as a result of improper fuel composition. There are two options here: either you saved money and filled the chainsaw with low-quality gasoline, or the proportions of the mixture of gasoline and oil were violated. The candle needs to be cleaned properly. To remove a plug from carbon deposits, a needle, thin awl or similar tool from available means will do. The electrodes also need to be cleaned.

In addition, in any case, it doesn’t hurt to make sure that the chainsaw’s carburetor is adjusted correctly. Do not begin adjustments until you have cleaned the air and fuel filters. If the filters are ok, use the adjustment screws.

One of them (S) is intended for idling, the other two are for maximum (H) and minimum (L) speeds, respectively. Gradually turn the screws clockwise. After stopping, make two turns in the opposite direction.

How to flush a chainsaw carburetor?

You should think about cleaning the fuel unit of a power tool in the following cases:

• when it is difficult to start the engine;
• in case of unstable operation of the internal combustion engine at short-term idle speed;
• in case of failures when smoothly pressing the standard throttle trigger;
• with a significant increase in fuel consumption.

Most often, liquids that are found in almost every garage are used to flush the built-in carburetor of a chainsaw:

• kerosene;
• diesel fuel;
• pure gasoline;
• solvent.

Modern gardeners using powerful professional saws use more effective and gentle means:

• Mannol Vergaser Reiniger is a cleaner marketed in aerosol form. It quickly and easily breaks down even the oldest formations of resins, soot, oily deposits and other types of contaminants;
• Hi-Gear – This cleaner is distinguished by its high dissolution properties. It can remove old dried stains, oily crusts and the first signs of rust without harming the parts of the fuel system;
• Jet 100 Ultra is a high-tech spray designed to quickly clean the carburetor of a chainsaw. Shows a high rate of dissolution of the oldest oil stains.

Cleaning the carburetor on a chainsaw is performed in the following sequence:

1. First you need to clean the outer part of the saw engine, and also remove and thoroughly rinse the factory air filter housing;
2. Next, you can proceed to disassembling the power tool. To do this, you need to remove the filter housing and also unscrew the fasteners holding the carburetor together with the engine;
3. Then you will need to carefully disconnect the thrust and gas cables from the carburetor. The springs included in the design must be removed so as not to stretch them;
4. After this, you need to carefully pull off the fuel supply hoses from the factory fittings of the fuel unit;
5. To clean the carburetor on a chainsaw, you need to remove it from the original mounting pins. At the same time, it is important to maintain the integrity of the gasket installed between the internal combustion engine cylinder and the fuel unit;
6. The next step is to clean the outer walls of the carburetor. To do this, they can be treated with liquid cleaner or gasoline. In this case, you need to try to prevent dust and debris from getting inside the engine assembly or cylinder;
7. Next, you will need to unscrew the screws securing the carburetor diaphragm, remove its cover and wash the internal cavity with an aerosol cleaner;
8. After this, you need to dismantle the fuel pre-fine filter, and also disassemble the part of the assembly to which the fuel is supplied. All internal parts of the carburetor must be thoroughly washed with an aerosol cleaner. If the first cleaning does not bring results, then the washing should be repeated.

After all the internal parts of the standard carburetor have completely dried, you need to assemble the fuel unit in the reverse order and install it in place in the structure of the household chainsaw.

Malfunction of the chain lubrication system in the chainsaw

What types of breakdowns occur in the chain lubrication system:

• No or low oil supply
• Oil leakage

In the first case, we first inspect the channels through which oil is supplied to the tire and clean them. Their clogging is a fairly common occurrence.

If there is significant oil leakage (small oil leakage is normal for all gasoline saws), you should check the tightness of the tubes and fittings of the oil pump. Tubes may fall off and even crack. Violation of the tightness of the tubes is eliminated by replacing them or sealing them with sealing material.

As for oil pumps, they may have different designs for different models of chainsaws, and the drive is also carried out differently (as a rule, the drive is carried out by a drive sprocket or a special gear on the crankshaft). If there is a problem with the oil pump, then most often you will not have to completely replace this entire unit; it will be enough to replace its moving part (plunger), which most often fails due to the ingress of large amounts of dirt and sawdust.

The most serious damage is a crack in the oil pump housing. In this case, you will have to completely replace it.

Why is oil leaking?

Many owners of chainsaws are faced with the problem of oil leaking from under the unit. Most often, oil leaks due to damage to the oil hose connected to the oil pump. The photo below shows exactly the case when the end of the hose has torn and does not fit tightly onto the pump nozzle.

But to get to this place, you will need to remove the clutch mechanism from the shaft. In some models of chainsaws, oil may leak out at the junction of the oil pump with the oil tank hose (indicated by an arrow in the photo).

To eliminate the lubricant leak, you will need to pull this hose out of the seat. To do this, you can use pliers to pull the outer part. At the end of the hose you will see a rubber plug, which is the cause of oil leakage. This plug needs to be wiped well to remove any remaining oil, after which its seat needs to be sealed with something. You can use automotive sealant or fum tape, as shown in the following photo.

Next, insert the hose into the hole, install the plug in place and seal it using a flathead screwdriver. At this point, the operation to eliminate the oil leak can be considered completed.

Chainsaw engine lubrication problems

If, when preparing the fuel mixture, you do not follow the proportions, do not add oil at all, or use a low-quality counterfeit replacement, the engine may overheat and completely fail. If you find deep scratches on the saw piston, you should immediately take a number of protective measures:

• Drain the low-quality fuel and replace it with a properly formulated mixture, including gasoline with a high octane number;
• Replace all faulty and damaged parts;
• Replace all seals, gaskets and seals;
• Clean the cooling system and air intake grille from debris and dirt;
• Clean the spark arrestor screen.

How to remove and replace the drive sprocket

The chain moves along the bus by a drive sprocket, which is connected to the gearbox. It is an assembly unit that rotates due to a bearing. At the end of the tire there is a driven sprocket with the same pitch relative to the drive one. Therefore, when carrying out repair work, all factors are taken into account: the alignment of the splines, the presence of bearings, and the kinematics of the tool.

When the spline wears out, the drive sprocket is replaced, otherwise traction with the chain will not occur.

In order to change a part, you must perform the following steps:

• unscrew the nuts of the tire cover and remove the headset using working tools;
• remove the air filter;
• unscrew the saw spark plug;
• remove the clutch on the chainsaw;
• inspect the drum and check the crown;
• remove the chainsaw sprocket;
• if necessary, replace the broken part with a new one;
• Reassemble all parts in reverse order.

If the process of replacing a sprocket on a Husqvarna chainsaw is difficult, use the services of a specialist.

Common Partner saw breakdowns: diagnostics at home

The Partner gasoline saw cannot be called unreliable. For many users it works without problems in winter and summer, for many years. But others complain about the same typical problems:

1. The chainsaw won't start.
2. The chainsaw starts but stalls.
3. Fuel does not enter the cylinder.

All these problems have internal causes in the parts and components of the tool. This means that in order to get to the bottom of it and fix the breakdown, you will have to disassemble the electric saw. This is not as difficult as it may seem, because manufacturers always take this possibility into account.

To independently diagnose problems at home, you need to understand that common chainsaw problems in the vast majority of cases are caused by the same reasons. Therefore, just by the symptoms, you can guess where the source of the problem is.

For example, if a chainsaw does not start, then the reason most likely lies in the ignition system, namely the spark plug. If air leaks into the cylinder, then you need to look for a defect in the fuel system. A dirty filter causes the engine to stall and smoke, and so on. Let's look at these cases in detail so that you feel confident when repairing the Partner chainsaw yourself.

Video

The main reasons why the chainsaw does not start in the video. The video will be useful for those who quickly want to start a saw; the author gives practical advice.

If a situation arises when the chainsaw does not start, it is important to correctly diagnose it and determine the direction in which to look for the fault. You should not use a tool that does not idle, as this indicates that there is air leaking into the engine and can lead to serious problems. If you don’t have enough experience in repairing chainsaws, it’s better to contact a specialist who will save your time and nerves.

Why does a chainsaw have trouble starting?

• fuel and air filters;
• reduced compression;
• carburetor adjustment;
• spark plug;
• ignition coil;
• gap between the ignition coil and the flywheel;

Let's look at each reason in more detail.

Fuel and air filter

Contamination of the main filter elements of a chainsaw negatively affects its operation.

For example, a dirty air filter will not provide enough air to the carburetor, which will affect the quality of the air-fuel mixture and normal engine starting. A dirty fuel filter will make it difficult or even cut off the flow of gasoline to the carburetor and make it impossible for the engine to operate.

Reduced compression

One of the common cases of difficult starting of a chainsaw is wear of the CPG (cylinder-piston group).

As you know, for a chainsaw to start normally, compression must be present in its engine. It is necessary for normal compression of the fuel mixture in the engine cylinder, and it also affects the operation of the fuel pump.

The reasons for the lack of compression or its decrease may be natural, because The engine wears out during operation. Problems can also be caused by a serious breakdown, for example, a scuffed CPG, or a broken piston ring.

A sign of low compression is weak starter resistance when starting. With reduced compression, a decrease in the power of the chainsaw is observed, which negatively affects its performance. The problem is eliminated by replacing the piston rings, or the entire CPG.

Carburetor adjustment

Incorrect carburetor adjustment will cause the chainsaw to not develop full power. It will be difficult to start, or not start at all. Carburetor settings directly affect the quality of the air-fuel mixture, which is necessary for normal starting and further operation of the engine.

Excess gasoline in the mixture is usually called overflow. A characteristic sign of overflow is a wet spark plug, after several unsuccessful attempts to start the chainsaw.

Spark plug

The spark plug is one of the main elements of the ignition system. A spark is formed at its electrodes, and if this element fails, starting will be difficult or not possible at all.

The spark plug may fail completely, or work intermittently or produce a weak spark. Checking the spark plug is quite simple; to do this, you need to unscrew it from the engine, attach it to the cap of the high-voltage wire and, placing it on the cylinder, pull the starter. If the spark plug is in order, the spark will be powerful with a bluish tint. A weak spark with a reddish tint is a sign of a problem. A defective spark plug needs to be replaced.

Ignition coil

The reason that a new chainsaw does not start, or starts poorly, may be the ignition coil. Modern chainsaws are equipped with electronic ignition coils. This part cannot be repaired, and, as a rule, if there is a defect, it is completely replaced.

Gap between ignition coil and flywheel

An incorrectly set gap between the flywheel and the ignition coil contacts affects the quality of spark formation, which in turn is responsible for normal starting and stable operation of the engine.

Chainsaw carburetor design

The carburetor of any new chainsaw is an integral part of the engine, which continuously regulates the amount of air required for constant mixing with fuel and supplies the finished mixture to the internal combustion engine cylinder.

In most modern chainsaws, built-in carburetors initially have a similar design and almost the same principle of operation. There are certain differences only in the fuel units of Chinese models.

The main elements of the carburetors of all chainsaws include:

• float chamber - a small compartment whose main task is to maintain the optimal amount of fuel filled;
• atomizer is an important mechanism that is initially responsible for injecting fuel into the intake air flow;
• diffuser - located next to the standard inlet through which air enters the engine compartment of the chainsaw. The main function of the diffuser is to forcefully accelerate the suction of air masses;
• tube - required to supply air in small volumes - portions, the sizes of which depend on the needs of the fuel system.

The operating principle of a chainsaw carburetor is also quite simple. When the chainsaw is running, the engine throttle valve is activated, which, when open, allows air to flow through the factory rubber tube. With the gradual opening of the standard valve and the tube connected to it, the float located in the chamber with fuel is activated. Continuously passing through a standard diffuser, the air intensively mixes with fuel. After this, the used ready-made air-fuel mixture is sprayed through the factory intake channel into the working cylinder of the standard engine.

When spraying fuel, the pressure inside the float chamber of the chainsaw is almost identical to atmospheric pressure. At the same time, the pressure in the factory air tube is rarefied. Due to the difference in these indicators, air is continuously sucked into the tube. As engine speed increases, it requires more fuel. Accordingly, the tube should suck in more air. Thus, the ability of the engine to intensively gain speed required for sawing large wood largely depends on the carburetor.

Carburetor parts, preparation for tuning and safety precautions

Before adjusting the carburetor, you should definitely make sure that the air and fuel filters are clean. Also, make sure that there is no air leaking into the engine from the side, otherwise you will not be able to adjust the carburetor correctly.

Almost any carburetor in a chainsaw is adjusted using three screws:

• The main jet bolt, which is usually indicated by the letter "H", is used to set the maximum engine speed;
• The idle jet bolt, which is designated “L”, and is used to set low speed or idle speed;
• Idle speed adjustment bolt, which is designated differently: “S,” “LA,” “T”

Of course, you may find carburetors with fewer screws. Such carburetors, as a rule, are specially designed to protect their products from incorrect settings.

Specifications

The parameters of the chainsaw compare favorably with those of similar light-class products.

Technical characteristics of the tool:

• type - gasoline, carburetor;
• engine power - 1.64 kW (2.2 hp);
• fuel tank volume - 0.41 l;
• oil tank volume - 0.20 l;
• engine volume - 36.3 cm³;
• number of links in the chain - 55;
• dimensions - 250x420x260 mm;
• noise level at full speed - 107 dB;
• weight without refueling - 4.9 kg;
• tire length - 40 cm;

Included with the chain saw are spare spark plugs and branded oil for lubricating the chain.

Chainsaw Partner 350 does not start. How the mechanism works

In fact, all tools, both foreign (Husqvarna, Makita, Shtil, Partner 350), and Chinese chainsaws, and Russian (Druzhba, Ural), are designed identically. Chainsaw partner 350 does not start. Therefore, finding the reason why the device does not start and stalls will not be particularly difficult.

There are four elements where difficulties may arise:

• The fuel for which the carburetor is responsible;
• Lubrication;
• The air that comes in;
• A spark, the quality of which depends on the ignition unit.

They all depend on each other and interact with each other. If any element does not work correctly, the saw stops working.

Let's start with the fact that all tools start up differently - hot and cold. Two commonly used mechanisms are responsible for this process.

Be sure to look at what is written in the user manual. It states that when turning it on, you need to make sure that the emergency stop brake is engaged. But starting a saw with a brake is much more difficult, so sometimes it’s better not to turn on the brake.

As you can find out from the instructions, inside the body there is a fuel tank and an engine, and outside there is a saw part (bar with chain), a handle and a starter.

First you need to figure out exactly how the tool won’t start. For example, the saw starts up, but immediately stalls, or loses power and cutting quality.

Perhaps interruptions in operation occur due to problems in the engine. Stihl chainsaw won't start: how to start it. But I would not recommend disassembling it right away. The chainsaw does not start: reasons and methods. Your chainsaw won't start? That the chainsaw won't start. (Husqvarna). It is better to look for the problem from the simplest option.

No. 8. The chain falls off

Why does the chain fall off the tire? The reasons may be different and they are all different:

• The transmission or driven sprocket is worn. As the sprocket wears out, traction on the chain decreases, causing the chain to fly off the chainsaw. The gear needs to be replaced.
• The chain has lengthened. Why does the chain stretch on a chainsaw - due to insufficient lubrication. The metal heats up and stretches, even by a fraction of a millimeter, but if you take into account the number of links, even 3-4 mm is enough for the chain to slip off the tire. The chain needs to be changed.

• Is the chain tensioner that regulates chain tension as loose as the chainsaw is adjusted, or rather the chain tension? It is necessary to adjust the tensioner - this can be done in a few minutes.

Where is the breather on a chainsaw?

A chainsaw is a device that is useful for every owner. Regardless of what model of chainsaw you have, sooner or later you have to study it thoroughly in order to diagnose problems and repair the device yourself. Why is this necessary?

Of course, such a working tool is not insured against breakdowns, but some are not so serious that you need to contact a service center (where you will have to leave a tidy sum). Sometimes a chainsaw can fail due to a simple clogging of the breather. Don't know where the breather on your chainsaw is? You will learn about this and much more from this article.

What is a breather?

This is a part that looks like a standard valve. It plays an important role - it normalizes the pressure in the chainsaw tank

Why is it important to normalize blood pressure? In order to answer this question, we need to consider the process of vacuum formation in the tank. This happens when fuel is supplied when the gas tank is hermetically sealed (at the same time the pressure on the walls increases)

The breather equalizes the pressure (relative to atmospheric pressure). Without this small valve, the importance of which many people underestimate, proper operation of the chainsaw is impossible.

Owners of Husqvarna chainsaws can also read the manual - how to clean the carburetor correctly?

Saw Huskvarna 137

This saw has gained popularity due to the optimal balance of its characteristics and high quality. This saw can be called ideal for household use:

• It is quite light, only 4.6 kg when empty;
• It has a good power of 1.6 kW, which allows you to solve a variety of problems;
• Equipped with vibration damping systems and a chain brake, which increase the convenience and safety of work.

Husqvarna 137 is a universal saw for the household. Thanks to its thoughtful design and high build quality, the saw will serve you for a long time, even with intensive work.

How to fix breakdowns and malfunctions of a chainsaw

Hundreds of sawmills encounter chainsaw malfunctions every day. Now let's look at ways to eliminate them. Experienced sawers know the problems with their tools and don't need to read instructions on how to identify and fix problems. However, such instructions will be useful for those who have not yet mastered their newly purchased gasoline unit.

1. If the candle has carbon deposits, it should be cleaned. Before starting the engine again, it is recommended to change the fuel mixture
2. If the spark plug is wet, you will need to adjust the carburetor
3. Lack of spark requires replacement of the spark plug or high-voltage wire. On the new spark plug you need to set the gap to 0.2 mm
4. The fuel filter cannot be cleaned, so it should be replaced if the chainsaw is suspected of being faulty. Before replacing the filter, the fuel tank must be emptied.
5. The air filter needs to be cleaned. This is easy to do - remove the part from the tool, and then blow it with a compressor
6. If checking the fuel supply shows that the gas-oil mixture does not flow out of the hose, then it needs to be cleaned
7. The chainsaw carburetor is adjusted periodically when it is discovered that the unit begins to operate intermittently. Detailed instructions for adjusting chainsaw carburetors
8. If the chainsaw stalls under load, then only cleaning and adjusting the carburetor will help correct the situation.
9. When a chainsaw heats up and stalls, the cause is the ignition coil. As the tool heats up, the resistance increases, so the spark can either be lost or weakened, which affects the power of the unit. You also need to check the unit for air leaks from hoses, seals and gaskets
10. If the chainsaw revs on its own and does not slow down, it means that the fuel filter needs to be replaced and the air filter cleaned. If this does not help solve the problem, then you need to make sure the carburetor is set correctly. The reason for an unauthorized increase in speed is a lean mixture, when a large amount of air enters the cylinder and a low fuel content
11. If research has shown that the chainsaw muffler is faulty, then it should be dismantled and then cleaned. This must be done using special detergents, which can be purchased at a specialized center. When dry cleaning the muffler, you need to use a respirator, since soot contains many carcinogenic substances
12. After checking, a faulty CPG is detected. Everything is sad here, and if there is no sufficient compression or there are scoring marks on the walls of the cylinder or piston, then a major overhaul is needed. Upon completion of such repairs, do not forget to run-in the unit.
13. If the chain lubrication system malfunctions, it is necessary to determine the cause of the failure, and only then eliminate it. If the channels become clogged, they will need to be cleaned. If an oil leak is detected, it can be eliminated by sealing the tubes and channels or by replacing them

If a malfunction is detected, it should be eliminated as quickly as possible. If this is not done, then one part will lead to failure of the entire assembly or even the mechanism. Any instrument (Chinese, European or Russian) needs proper care, operation and regular preventive measures.

https://youtube.com/watch?v=ENK8zzdueQw

Gasoline does not enter the chainsaw carburetor - repair methods

Most often, the standard cause of this common breakdown is the formation of a blockage in the fuel foam filter or tubes responsible for the stable supply of fuel to the factory metal cylinder of the engine. Every third Chinese power tool regularly suffers from these blockages. This is due to the low quality of the built-in filters and tubes that come with inexpensive Chinese chainsaws.

Repairing a fault involves removing and washing contaminated parts.

To do this you need:

1. Remove the cover of the plastic saw body;
2. Clear the space underneath and begin dismantling the hoses and filters. The tubes are attached to the outlet fittings using clamps. To disconnect the hoses without damaging them, you need to loosen and remove the clamps. After this, the tubes will need to be blown out with compressed air and washed with clean gasoline;
3. To dismantle the filter, you must first remove it from the factory housing. After this, the element will need to be placed in a container with clean gasoline. After a day, the filter can be removed and given time to dry;
4. After washing, all parts must be carefully installed and secured in their original place in the carburetor.

This cleaning regimen will help thoroughly flush the most vulnerable elements of the fuel system without having to disassemble the entire carburetor.

No fuel supply to the saw

How many Nm is actually needed?
A necessary theoretical digression. From strength of material M (torque) = τ (tension in the rod) * W (polar section moment equal to Π*D3/16)

Bolt strength class *.* means the following: 1st digit – 1/100 of the nominal tensile strength, in MPa 2nd digit – ratio of yield strength to ultimate strength That is, a bolt of strength class 6.8 has a tensile strength of 600 MPa, and a yield strength of 600*0 ,8=480 MPa The obtained figures are confirmed by the experiment carried out at the training center: An M6 bolt with a strength of 8.8 begins to “float” (irreversible plastic deformations occur) at 17 Nm, and when a torque of 23 Nm is reached, destruction occurs. Let's make a similar calculation for screws and self-tapping screws: For the calculation, the full diameter is taken, the minimum cross-section is much smaller! Conclusion: To use the most popular fasteners with Ph2 and Pz2 splines, a tool with a torque of no more than 6 Nm for a diameter of 4.2-4.5 mm is required, in rare cases up to 10 Nm for fasteners with a diameter of 5.0 mm. Exceeding the specified torques leads to damage to the fasteners and screwdriver bits. 13 self-tapping screws Ø4.5 x70 mm are screwed into a “pie” 121 mm thick. A torque of 3.0 Nm, developed by a Makita DF010DSE screwdriver, is enough to confidently screw a self-tapping screw Ø4.5 x70 mm to its entire length. If to prevent the destruction of screws and self-tapping screws you need a torque of 2-3 Nm, rarely 5-6 Nm, and in exceptional cases up to 10 Nm, then why is there a torque of 20, 30, 50 Nm on a screwdriver? What else can a drill/driver do? If you drill, then you drill! What torque is needed for drilling? Theoretical digression No. 2. Let's consider drilling steel as the heaviest metal drilling in terms of load. Torque is calculated using the formula Mcr=10CMDqSyKp, where D is the drill diameter, S is the feed, and the remaining signs are correction factors. For steel with δ=750MPa: CM=0.0345,q=2.0,y=0.8,Kp=1.0 The drilling speed is taken equal to 20-25 m/min (with spray cooling), the corresponding revolutions are entered into 4 -th column. Torque, rotation speed and shaft power are related quantities. We enter the amount of required power on the shaft in the 5th column. Let's look at the numbers: To drill a hole Ø10-13 mm, a torque of 8-15 Nm is required. With a recommended drilling speed of 720 -550 rpm, this requires power from 570 to 850 W. What is the power of a cordless drill?

There are 3 holes in a regular drill chuck for a reason: For reliable fixation, the chuck must be alternately tightened through all 3 key positions. In a chuck tightened through one hole, a Ø10 mm drill rotates at a torque of 13.5 Nm, and through 3 holes (as expected) at 23 Nm. And when drilling steel, torque must be transmitted to a Ø13 mm drill

15 Nm. Those. When the chuck is tightened through one hole, the drill will turn! Cordless drill power (consumption) = Battery voltage*current consumption Current consumption for high-power models is 20-25 Amperes Thus, the power for a cordless tool will be: For 12 Volts: 240–300W 14.4 Volts: 290–360W 18 Volts: 360–430 W The torque for the most powerful (18 volt) drill will be: at a speed of 1500-1700 rpm: 2-3 Nm at a speed of 300-400 rpm: 8-14 Nm drilling steel with a drill up to Ø7mm drilling steel with a drill Ø10-13mm These are the values torque at maximum power. (in drilling mode) When the engine is overloaded when tightening rigid fasteners (for example, bolts), the torque reaches 30-40 Nm. It is these values ​​that are indicated in the characteristics as the maximum soft/hard moment. They have no practical significance! If, when working with a tool, high torque values ​​are required, then you need a specialized tool specifically for this job. Summary: For an ordinary user, it is enough to have a torque of 3-6 Nm in a cordless drill/screwdriver, adjustable with a ratchet, to work with standard fasteners with a head size up to Ph/Pz2, and up to 10 Nm for Ph/Pz3. For drilling steel, plastic, wood with drills up to 10mm in diameter, a torque of 10-12Nm is sufficient. A torque of more than 15 Nm requires the use of specialized tools and should not be within the scope of application of a universal drill/driver.