DIY Husqvarna 345 chainsaw repair

The chainsaw is a worthy replacement for hand saws and axes. Today, this tool is available in almost every household - it is indispensable for setting up a personal plot, construction and repair work. Intensive use and improper care of the tool can lead to premature failure. However, the owner of the chainsaw does not have to go to the workshop right away - many of the faults that can happen to her during operation can be completely eliminated on their own.

Correct diagnosis is essential for a successful repair. Therefore, in order to determine why the chainsaw failed and, most importantly, how to make it work again, you first need to know the features of its design.

It should be noted that it does not differ in particular complexity, since it includes:

• engine (two-stroke gasoline);
• functional part (saw bar and chain);
• systems that ensure the joint operation of these two units (ignition, filtration, lubrication, etc.), that is, the tool as a whole.

In order to simplify the diagnosis of malfunctions, it is customary to distinguish them into two main categories:

• engine malfunctions;
• malfunctions of other parts of the chainsaw.

Most often, failures occur in the engine systems, however, the rest of the tool, due to intensive use or improper care, can fail at any time. How to determine exactly where the breakdown occurred? Simple logic will help us with this.

If the problem is in the engine, it will:

• do not start;
• deafen;
• work unstable;
• overheat;
• smoke;
• develop insufficient power.

As for all other malfunctions, as a rule, they manifest themselves with a normally operating motor.

If your chainsaw won't start, the first thing to do is to check for a mixture of fuel in the tank. By the way, it must be prepared in the proportions indicated by the engine manufacturer, otherwise the instrument will simply not start.

After verifying that the fuel mixture is correct and available, the ignition system should be checked. To do this, you need to inspect the spark plug.

Her condition can say a lot:

indicates that the fuel mixture does not enter the carburetor, which means that the problem is not in the ignition;

is the result of an overabundance of the fuel mixture, which lies either in a violation of the engine starting algorithm, or in an incorrect carburetor adjustment;

this is a signal about the presence of low-quality oil in the engine lubrication system, incorrect carburetor settings, or an incorrectly prepared fuel mixture.

If the spark plug is splashed with fuel, wipe it thoroughly after removing it. The fuel supply system should also be cleaned. To do this, it overlaps, after which the starter is turned on. A carbonized candle must be carefully cleaned with an awl and emery.

When checking the spark plugs, you should pay attention to the distance between the electrodes (the normal gap is 0.5-0.65 mm), as well as the condition of the gasket and the presence of a spark. A damaged or worn gasket will have to be replaced, and the spark can be checked by putting on the ignition cable, connecting the cylinder and plug nut, and starting the starter.

If the discharge does not occur, the plug must be replaced. In the event that a spark does not appear with a new candle, then the problem is in the connection to the high-voltage wire or in it itself.

If the fuel mixture does not flow into the cylinder, but the spark plug is working properly, this may mean that:

1. Clogged fuel filter.

To clean this unit, remove the fuel hose and check the jet. If it is weak, the filter must be removed through the filler hole of the fuel tank and cleaned or replaced if completely worn out.

As a preventive measure, it is recommended to replace the fuel filter at least once every 3 months.

This is nothing more than a hole in the fuel tank cap, which is cleaned out with an awl.

1. The fuel mixture is not supplied or is supplied insufficiently.

There may be several reasons for this:

• the air filter is clogged (in this case, it must be removed, rinsed with water, dried and replaced);
• the carburetor settings are out of order (which means this unit needs to be re-adjusted);
• the integrity of the carburetor membrane is broken (must be replaced);
• the channels of the carburetor are clogged (it must be disassembled and all parts and assemblies must be cleaned).

If at low speeds the engine of the chainsaw works normally, but at high speeds it starts to stall and smoke, the problem may be hidden in the muffler.

To check the quality of its work, you should do:

• dismantling (with the obligatory closing of the outlet);
• disassembly (if the muffler is collapsible);
• cleaning from carbon deposits using special detergents or dry method;
• drying (using a hair dryer);
• reassembly and assembly.

Dry cleaning without respiratory protection is not recommended. The carcinogens present in the soot will be released into the surrounding atmosphere in the form of dust, the inhalation of which is extremely hazardous to health.

To prevent clogging of the muffler during the operation of the chainsaw, you should carefully monitor the composition of the fuel mixture and the quality of its components.

If the chainsaw engine does not start or cannot develop normal power, it is likely that sufficient pressure does not build up in the engine cylinder for combustion of the fuel mixture. The reason for this may be the wear of the elements of the cylinder-piston group - the piston, rings, bearings, etc. In order to assess the condition of this unit, it should be visually inspected, having previously removed the muffler.

For a more complete diagnosis, a compression gauge is placed in the spark plug hole of the two-stroke engine of the chainsaw. It measures the compression in the engine. Based on the results of the check, one can judge the state of the CPG, however, the exact facts can only be obtained with a complete disassembly of the unit.

If the piston is chipped or scratched, it will obviously need to be replaced. The same applies to deformed or broken piston rings - for normal engine operation, they must be completely intact and free of carbon deposits.

A properly working carburetor guarantees maximum efficiency of the chainsaw, that is, it is possible to develop full power with the most economical consumption of the fuel mixture. The adjustment of this unit is usually carried out by the manufacturer, but its design provides for the possibility of adjustment already during operation.

The fact that such a setting will have to be performed by the owner of the chainsaw is evidenced by:

1. Strong vibrations or damage to the protective cover.
2. CPG wear.
3. Carburettor clogged.
4. Inability to start the engine or its spontaneous stops after starting.
5. Increase in fuel consumption and emissions while decreasing engine power.

Chainsaw carburetor adjustment is carried out in strict accordance with the manufacturer's instructions using three special screws, which are responsible for the maximum ("M") and minimum ("L") revolutions, as well as the idle speed of the engine ("T"). In order to exclude unwanted interference by an inexperienced user with the carburetor operation, some manufacturers install only one idle screw.

Carburetor adjustment is carried out in two stages:

1. Basic (carried out with the engine off).
2. Finishing (carried out with a running, pre-warmed engine).

For basic adjustment, screw in screws H and L as far as the stop and back out 1.5 turns. Final adjustments require the engine to warm up for 5-10 minutes at low revs.

The final calibration is performed by unscrewing the idle screw until the minimum engine speed is reached (in this case, its operation must be stable, and the chain must be stationary). If the engine stops at idle speed, the screw must be returned back, and if the saw chain is still in motion, continue turning counterclockwise.

Calibration check is performed by test:

1. Acceleration (with a smooth press on the accelerator, the engine should quickly pick up speed to the maximum indicator).
2. Maximum speed (if there is an ignition interruption, screw H should be slightly loosened).
3. Work at idle speed (the chain should not move, and the engine should pick up speed as quickly as possible).

If the owner of the chainsaw is not familiar with the carburetor device and does not have the tool necessary to calibrate it, contact a specialist. The carburetor is a very complex unit, so any wrong action can lead to irreversible consequences, for example, complete engine failure.

If the diagnostics showed that everything is in order with the engine and its systems, then the cause of the malfunction should be looked for in other units of the chainsaw. The most common problems are:

• failure of the starter;
• improper operation of the lubrication system;
• incorrect operation of the chain brake;
• saw chain wear, etc.

If the cause of the tool failure is not visible to the naked eye, as is the case with the engine, it is necessary to perform a thorough diagnosis of the faults and eliminate them in accordance with the manufacturer's recommendations and safety regulations.

Today, almost every owner of a private house or an advanced summer resident uses a chainsaw, which is highly mobile, unpretentious in operation and repair. Among the many models of gasoline vehicles and equipment on the market, the Swedish brand Husqvarna is worth highlighting. Founded 400 years ago, the Husqvarna company first produced weapons, and in 1959, in connection with the need to expand the line of products, launched the production of chainsaws. Unlike competitors, this manufacturer sought to improve the layout of the saw. To reduce the level of noise emitted by the engine, the famous designer from Sweden Sixten Sazon used a muffler in the Husqvarna chainsaw using the example of a motorcycle.

Almost all professional and amateur chainsaws are equipped with air-cooled two-stroke gasoline engines.

Chainsaw Husqvarna: main components

This assumes the presence of at least one cylinder with heat sink fins. The fuel supply system (carburetor) acts as a gasoline-air mixer. Dirt, dust, shavings should not enter the working combustion chamber together with the fuel mixture, and filters are installed on the saws to clean the supplied air. Manufacturers recommend changing the filter once a season. In the interval between replacements with a frequency of once for 10-15 fillings, it must be cleaned.

For convenience and ease of starting the internal combustion engine in any chainsaw, a starter is provided, which is a reel with a wound cable and a handle. Even the most powerful husqvarna chainsaw is equipped with an intelligent starting mechanism.

In order to reduce the vibration transmitted to the hands of the feller, a special device is installed on the tool. In addition, this mechanism prevents the tire from "pulling" when cutting wood.

Despite the fact that ideal chainsaws have not been created and it is unlikely that anyone will succeed, this Swedish company strives for design perfection and increasing the power of its models. The entire husqvarna range of saws are characterized by pleasant enhancements that make their owner's job much easier.

General view of husqvarna chainsaw

These positive options include:

• use of the fuel "suction" button (primer) for the convenience of starting the internal combustion engine;
• automatic adjustment of the carburetor by the Auto Tune system;
• side chain tensioning mechanism;
• environmentally friendly and powerful X-Torg engine;
• vibration reduction system;
• a mechanism for forced lubrication of the chain through a hole in the driven sprocket;
• centrifugal air purification Air Injection, which makes it possible to change the filter less often;
• universal key for service and repair.

In order to avoid the acquisition of fake Husqvarna chainsaws, it must be remembered that their licensed production is established exclusively in Sweden, USA, Russia, Brazil.

Regardless of the power, performance and size of the models, their problems are divided into 2 types:

1. Malfunctions of the engine, fuel supply system, cylinder-piston group, muffler;
2. Transmission breakdowns (malfunctions of the brake system, tire, chain, clutch, etc.).

Based on many years of experience, most experts say with confidence that mainly the causes of breakdowns lie in the operation of the internal combustion engine. The striking manifestations of the incorrect operation of the chainsaw motor include:

• difficult start;
• unstable idling;
• does not develop full power;
• extraneous sounds are heard during operation.

In order to reduce the complexity of diagnostics and subsequent repair of the Husqvarna chainsaw with their own hands, experts advise starting with simpler units and parts for maintainability.

The first step in ignition diagnostics is to check the spark plug. It must be unscrewed from the cylinder shaft with a special wrench or socket head. The gap between the side and center electrodes should vary from 0.7 to 1.5 mm.

Husqvarna chainsaw malfunctions

If this distance is exceeded, there will be a periodic absence of a spark. On the contrary, if the gap is too small, the discharge will not be sufficient for full ignition of the fuel mixture. You can set the recommended gap parameters using locksmith probes, which you can buy at any car store.

If there are traces of gasoline on the surface of the candle, then most likely it does not completely burn out. It is not necessary to look for the causes of malfunctions in the Husqvarna ignition system in the absence of moisture on the plug, since in this case it is necessary to adjust the fuel system, the steps of which are described below.

The most common types of ignition failures include improper clearance (more or less 0.2 mm) between the flywheel and the ignition coil. It can also be set independently by means of the probes.

The fuel supply system is one of the most difficult in the unit, and therefore it is worth taking it as seriously as possible and following certain rules. Gasoline may not flow to the carburetor for the following reasons:

- clogged breather (holes in the tank lid);

- the fuel filter is clogged with dirt.

To clean the breather, you need to prepare a regular sewing needle. In the second case, it will be necessary to dismantle the tank and replace the fuel filter.

Carburetor with adjusting screws

The entire range of the Swedish manufacturer is equipped with traditional carburetors with three adjustment screws:

1. Screw "T" - setting the mixture supply at idle;
2. Screw "L" - low speed adjustment;
3. Screw "H" - at maximum speed.

First of all, it is necessary to "find" the highest speed with the screw L in the absence of load (at idle speed). Then turn it counterclockwise by a quarter of a turn.

If, in this position, the chain on the bar continues to move, you need to achieve a stop by means of screw T.

Husqvarna chainsaw carburetor

To adjust the Husqvarna carburetor at maximum speed, after pressing the accelerator key for full, wait 10-15 seconds. Turn the screw "H" clockwise ¼ turn and listen to the operation of the internal combustion engine. If during engine operation there is an extraneous ringing "squeal", gradually unscrew the bolt until it disappears. On the contrary, in case of excessive smoke production, it is required to lean the mixture, gradually tightening the screw.

After setting the minimum and maximum revolutions, we adjust the saw idle. To do this, turn the screw "T" clockwise until the chain starts moving along the bus.

Correct tuning of the fuel delivery system requires a tachometer (a device for measuring revolutions per minute), as well as the experience of the owner.

The ICE starting system is used to turn the shaft and, as a result, the appearance of a spark and ignition of the fuel mixture. Like most models, Husqvarna's kick starter consists of:

Chainsaw starter Husqvarna

When the starter jerks, the drum ratchet engages with the engine shaft, as a result of which the crankshaft will rotate. Despite the condition of the tool, starting the engine the first time is quite problematic. To facilitate the start, it is required to make several presses of the primer (the button for pumping the mixture). A backup spring can be provided in the design of the starter, which, after being compressed by the main one, gives a sharp push to the shaft. As such, the repair of the starter is not provided, and if one of the elements breaks down, it will need to be replaced.

The cutting saw chain of this manufacturer consists of working teeth, depth stops, locking pins. The most loaded in the sawing process are the cutting links made of high-alloy structural steel. By design, they are divided into left and right-handed. The cutting width is determined by the distance from the side edges of the left and right links.

DIY husqvarna chain tensioning

The main characteristic of the husqvarna chainsaw chain is the pitch, which can be measured from the first to the third rivet by dividing the result by two. Due to the fact that the inch is adopted in the Western system of calculation, manufacturers in their passports indicate the step in inches (25.4 mm) with the instrument. Medium chainsaws use 3/8 '' chains, and heavier weighted chains use 4.

One of the most important indicators of the chain is the thickness of the shank, which for most models is 1.3 mm. They are often used on specialized and general amateur instruments. The thickness of the links must be matched to the groove in the bar, as excessive thickness can lead to chain breakage or fall.

When the chain is relaxed, it must be tightened by means of the mechanism located on the side of the unit. Having previously removed the left side cover (2 bolts), weaken the tire for the husqvarna chainsaw. Next, we unscrew the longitudinally tightened bolt, thereby moving the guide away from the power unit. When properly adjusted, the chain should roll easily but not dangle on the bar.

An important protective unit in a chainsaw is certainly the chain brake, which, in the event of a kickback, blocks the rotation of the cutting edges. As a result of the tire rebound in the direction of the feller and, as a consequence, his possible injury, the friction mechanism disengages the drive sprocket and the drive shaft.

Husqvarna Chainsaw Chain Bar Slip

The brake start can be of contact or inertia design. In the first case, the protection will be triggered as a result of the return throw of the unit. The inertial brake system is the generation of large inertial forces acting on the drive shaft.Regardless of the features of a particular design, experts recommend purchasing chainsaws equipped with similar mechanisms.

After the repair and adjustment of the Husqvarna chainsaw, it is required first of all to check the performance of the brake assembly.

In all models of chainsaws presented, oil is supplied to the tire automatically.

The main components of the husqvarna chain lubrication system

Before starting work, you need to make sure that there is a lubricant in the reservoir. The oil pump interacts with the drive sprocket, and as the shaft rotates, the gear delivers lubricant to the running surface of the chain. Due to the constant presence of oil on the cutting edges, the chain is less prone to friction and, as a result, loses its properties noticeably more slowly. If the lubrication mechanism fails, the husqvarna saw will have a fine brown chain. Periodically, the left protective cover of the unit must be removed and the oil hole cleaned with compressed air or a needle. The delivery rate of the pumping unit directly depends on the number of revolutions of the tool.

Chainsaws, simple in design and reliable in operation, are very popular among owners of private houses and summer residents. With the right handling of this tool, it takes a long time and rarely breaks. Moreover, it will not be difficult to eliminate the cause of the chainsaw malfunction with your own hands, especially if you know where to look for the cause.

The Swedish manufacturer's tool can turn hard work into a simple task. Chainsaw models "Husqvarna 137", "Husqvarna 240" and "Husqvarna 365" features three features:

• high engine power;
• improved engine filtration system;
• the ability to absorb unnecessary vibrations.

If the tool is operated strictly according to the instructions and its malfunctions are eliminated in a timely manner, then it will delight with reliable and stable operation. Correctly carried out repairs with original spare parts will allow you to use the saw for a long time.

The main cause of chainsaw breakdown is most often engine failures, which can manifest as follows:

• do not start;
• work unstable at idle;
• start up and immediately stall;
• not have enough power.

In this case, the malfunction should be sought in the ignition system, piston group or fuel system. Often the reason for poor performance of the tool can be associated with the clutch, brake system, lubrication mechanisms, tire.

Do-it-yourself repair of the Husqvarna 240 chainsaw, and of any other model, should begin with troubleshooting the ignition system.

First of all, experts recommend get and inspect a candle... The state of this element will indicate deficiencies in the operation of the fuel system.

1. If the plug is completely dry, it means that the fuel mixture does not enter the cylinder. In this case, the plug is screwed into place and the fuel system is repaired.
2. If the spark plug is heavily flooded with a fuel mixture, then the rules for starting the unit may be violated, or the carburetor is poorly adjusted. Shut off the fuel supply and start the starter. This is done in order to remove excess fuel. The candle must first be cleaned with a sharp object, then rinsed with detergents, dried with a hairdryer and reinstalled. After that, the tool is launched and its work is checked.
3. If there are no fuel residues on the spark plug, then it must be cleaned, washed and checked for a spark. Its absence may indicate a violation of the gap between the flywheel and its magnetic circuit or a breakdown of the ignition module.

A malfunction in the ignition system can be associated with the use of poor oil or with an incorrect ratio of gasoline and oil.

If fuel does not enter the chainsaw tank, then this may be two reasons:

1. The filter is clogged.
2. Lid clogged.

In this case, the fuel is not supplied in full, and the tool does not start or starts and immediately stalls.The repair consists of cleaning the air filter and cover.

The filter must be removed very carefully so that dirt that clogs it does not get into the carburetor. It is cleaned and washed with ordinary detergents.

The heart of any chainsaw is the carburetor, with which most tool breakdowns are associated.

Do-it-yourself repair of this unit consists of disassembly and cleaning. If the breakdown is serious, then contact the service center for help.

Most often, tool malfunctions are associated with the use of gasoline or poor quality oil... To protect the carburetor from damage, you must follow some preventive measures:

1. Start the chainsaw strictly according to the instructions.
2. It is not recommended to store gasoline in a plastic container. This will help to avoid heavy carbon deposits.
3. The fuel mixture cannot be stored for a long time, as it loses its quality over time.

This brand is very popular among both individuals and professionals. This easy-to-use and reliable tool can last a long time without being repaired. There are situations when the "Calm" chainsaw does not start or stalls right after the plant. You can find out what to do in these cases by watching the video instruction.

The reasons should be sought sequentially, moving from simple to complex. You should not immediately disassemble the carburetor, which is equipped with many different parts and small elements.

First of all, it is necessary check fuel availability and pay attention to its preparation. The mixture should consist of high quality gasoline and oil, the brand of which is indicated in the instructions attached to the saw.

The saw may not start due to the fact that at the moment of starting the spark plug is filled with gasoline. The problem is corrected by drying out or replacing the spark plug and draining the excess fuel.

Quite often, if there is poor contact between the tip of the candle and the high-voltage wire attached to it, there may be no spark. In this case, the connection should be restored. If after this the spark does not appear, then the electronic ignition unit is most likely faulty. It must be replaced with a new one.

You cannot count on an easy start and operation of the chainsaw if its filter is clogged. It needs to be taken out, well cleaned and rinsed, paying particular attention to the mesh.

Sometimes the saw motor will not start due to a malfunction of the cylinder-piston group... In this case, for repair you will need:

1. Unscrew the bolts and remove the cylinder from the block.
2. Check the integrity of the piston and cylinder.
3. If the cylinder is damaged, then it must be replaced with a new one, or it must be repaired by boring the mirror to the size of the piston.
4. Determine the degree of wear of the piston rings and replace if necessary.

For an instrument that ran on relatively normal fuel, such procedures are sufficient. Now you can saw reassemble.

Some parts of the "Husqvarna" and "Calm" chainsaws must be replaced after the expiry of the passport service life. These terms are spelled out in the instructions attached to the tool. It also indicates how to properly wind the instrument. Acting according to the instructions, distinguishing between cold and hot starts and using the chainsaw strictly for its intended purpose, it will be necessary to repair it very rarely.