Chainsaw friendship Altai. Review of petrol saws “Friendship”. User manual. Malfunctions, their causes and elimination

Correct carburetor adjustment

Inside the Druzhba chainsaw carburetor body is an air nozzle, which is blown by the chainsaw engine, and the fuel itself enters through the corresponding holes and jets. The flow rate of the oil-gasoline mixture is regulated by the throttle valve, and the operating mode of the fuel pump depends on the speed of the chainsaw engine. To prevent dirt and small dust particles from entering the carburetor, an air filter is installed on it, which perfectly protects the engine from environmental pollution.

The fuel mixture is considered normal if the weight ratio of gasoline to air is 1:15. With such a mixture, the engine operates at a power 5 percent lower than the maximum possible, and fuel consumption is 4-5 percent higher than the minimum.

The Druzhba chainsaw engine reaches maximum power when it runs only on an enriched mixture, with a weight ratio in the range of 1:12-1:13. If it is necessary to achieve the most economical operating mode of the engine, then the mass of air per 1 kg of gasoline should be increased to 16-17 kg; such a mixture is called lean.

For those who don’t know what we’re talking about, we recommend reading an interesting review of the Friendship 4 chainsaw.

If the amount of air in the mixture is increased further, our mixture becomes even more depleted and eventually the saw stalls. On the contrary, if you increase the amount of gasoline, at a ratio of 1:6-1:12 the mixture will be enriched, the engine will work with strain, a large loss of power occurs, and such operation is extremely uneconomical. An enriched fuel mixture is used when running in a new engine or after repair is required.

Adjusting the carburetor of the Druzhba chainsaw should not be done on a cold engine; before starting the adjustment, you need to let the engine run a little, maybe at idle.

Carburetor adjustment algorithm

1. The screw that regulates the quality of the fuel mixture is tightened all the way, and then unscrewed half a turn.
2. Using the idle screw (hereinafter referred to as the XX screw), the moment of the smallest but stable rotation of the crankshaft is found, then the screw that regulates the quality of the mixture (it is lean at this moment) is unscrewed until interruptions in engine operation occur.
3. Smoothly tighten the XX screw (the mixture is enriched at this moment) until the internal combustion engine operates stable. Tighten the screw that regulates the quality of the mixture again, lowering the crankshaft speed and fix the new position of the XX screw, which is responsible for idle speed.

The above operations must be repeated as much as necessary to obtain a minimum but stable crankshaft speed of the Druzhba 4 chainsaw.

If the engine stalls when you quickly open the throttle, you need to tighten the mixture quality screw a little, thereby enriching the mixture. And if the engine of the Druzhba chainsaw stalls when the throttle is quickly opened, you need to turn this screw a quarter turn, that is, lean the fuel mixture.

With correct and timely carburetor adjustment, the Druzhba 4 chainsaw will operate at the maximum possible power, while gasoline consumption will be minimal.

Basic setup

On any modern saw, the carburetor has three special screws:

• L - for low speed jet.
• H - designed to adjust the high speed jet.
• T - screw for “adjusting” the idle speed.

The location of each of them is specific to different manufacturers, so this issue should be clarified using the operating instructions. The easiest chainsaws are “Druzhba”, since the instructions for its maintenance are easy to find.

The initial setup is carried out at the manufacturer. Note that this adjustment provides for a slightly richer fuel mixture. It must be saved during the first hours when the chainsaw is running. Adjusting the carburetor in the future involves more precise settings.

Despite the fact that Druzhba chainsaws have a high build quality, they tend to periodically fail and every owner of this tool should know the rules for correcting the most common faults.

Currently reading: How to Start a Ural Chainsaw and How to Turn it Off

The engine will not start:

1. Soot has formed on the spark plug or the gap has been set incorrectly, and the spark has disappeared.
2. The air filter is clogged.
3. Lack of fuel.

Power drops:

1. The air filter is clogged.
2. The carburetor is not set correctly.
3. Incorrect fuel mixture ratio.
4. A detailed description of the malfunctions is given in the operating instructions.

The design of the famous Soviet chainsaw is based on a powerful 2-stroke single-cylinder MP-1 engine with an air cooling system, which has an increased service life and good endurance. The engine is lubricated using oil, which is diluted in gasoline to prepare the fuel mixture.

The saw accessories are connected to the motor using flange connections, which are fixed with a clamp attached to the handles of the chainsaw. Thanks to this unusual arrangement, the operator is able to rotate the bar and saw chain at any angle required for work. In addition, this method of connecting saw accessories and a motor makes it possible to use the latter in cases where there is a need to make various home-made household units.

The preparation of the fuel mixture in the design of the Druzhba 4 chainsaw is handled by a carburetor consisting of two chambers. Electronic ignition and a spark plug are responsible for producing the spark necessary to ignite the fuel. The chainsaw has a standard muffler, the function of which is to reduce the noise level when working with the tool.

To transmit and convert the torque of the motor, a gearbox is provided in the design of the Druzhba chainsaw. It is highly reliable and rarely requires repairs, even when operating the chainsaw in difficult conditions.

Ignition system repair

Childhood chainsaw disease Friendship 4 - difficulty starting a hot engine when stopped in operation. The reason for this is a weak and outdated ignition system. To increase the power of the spark at the plug, it is necessary to repair the ignition. Such a repair will correct the situation even if there is no standard coil.

Step-by-step algorithm for repairing the ignition of petrol tools Druzhba 4

1. The high and low voltage windings are removed from the standard ignition coil.
2. Instead of a low-voltage winding, 250 turns are wound onto our coil with special wire (for transformers). You can use PEV2 wire, with a cross section of 0.8-1 mm. We must not forget about interlayer insulation - a new layer of special wires is laid with paper. The beginning of the entire winding is connected by soldering to a standard output to the magnetic core, the other end of the winding is connected with a special mounting wire to the breaker. Then the coil is wrapped with electrical tape or covered with another insulator. The section of the capacitor circuit fed to the coil and the breaker does not undergo changes.
3. Using two wires through a piece of insulating tube, the ends of the connections are made. To prevent short circuits, all the resulting wiring can be placed in one insulating tube.
4. An ignition coil of type B-115 with a removed side resistor is ideal as a transformer. This type of coil is used in ignition of old Soviet Muscovites. It is not recommended to use motorcycle ignitions; they are not powerful enough to provide the required spark. The reel can be fixed to the chainsaw frame using a mounting clamp in any suitable place.
5. The wires from the internal combustion engine are switched according to the following scheme: the first wire, which connects the breaker, capacitor and coil output together, is connected to terminal B-115 with the designation “VK”, the second wire, which comes from ground, connected to the magneto mounting screw, is connected with output B-115 without identification marks. To make the diagram easier to read, it is better to use different colored wires.
6. Finally, the ignition coil is connected to the engine spark plug igniter using a high-voltage wire.

Why is Friendship 4 not gaining momentum?

Starting the Friendship 4 chainsaw is the most technically complex process in which all systems of the chainsaw are involved. But if you manage to start the engine, but when you press the gas handle the saw does not gain momentum, there may be many reasons:

• Malfunctions in the engine: the service life has expired, the cylinder or piston rings are worn out, rusted or scored;
• Malfunctions in the ignition system: the spark plug or coil winding has failed - the spark is weak or does not form at all and cannot ignite the fuel mixture;
• Malfunctions in the carburetor: incorrect settings, unbalance of the carburetor cover mounting bolts;
• Depressurization of the fuel system, engine crankcase;
• There is a lot of carbon deposits in the muffler and exhaust gases are difficult to release.

Eliminating the causes of ignition system malfunctions

1. Unscrew the spark plug, dry it if it is filled with fuel, replace it with a new one if it has strong black carbon deposits.
2. Make sure that the coil is not pressed tightly against the magnets, there should be a distance of up to 0.2 mm and free movement. If this is not the case, secure the coil to the required distance.

If these manipulations do not help, you can independently check the entire spark plug block for spark supply through the power cable. If there is a spark, but you cannot understand the cause of the problem, it is better to take the chainsaw to a service center.

Eliminating the causes of malfunction of the carburetor unit

1. Correctly adjust the chain saw carburetor. Read above how to do this.
2. Remove the carburetor cover, check the presence of all parts and their movement inside the block, secure the cover in place by evenly tightening the fastening screws, checking that the carburetor cover fits snugly.

Eliminating the causes of exhaust system malfunction

Dismantle the muffler, mechanically remove carbon deposits from the walls; if necessary, you can use white spirit, VD-40 or other solvents.

In other cases of malfunction, we advise you not to carry out independent repairs and trust the professionals of the service center.

How to start a chainsaw without a starter

Many people on the Internet are interested in the question of how to start a chainsaw without a starter. Let’s not give hope to our readers; it’s impossible to start a chainsaw, any kind, this concerns not only Friendship 4.

The manufacturer does not provide the ability to start the internal combustion engine in any alternative way other than through the starter. If you dismantle it and instead force the spark plug to give a spark by applying an external rotational force, starting the engine at idle, such an engine will not work for a long time, the chainsaw will be left without a cooling system.

The standard starter of the Druzhba 4 chain saw has a cooling scroll, the impeller of which directs a flow of cold air to the cylinder.

Finalization of Friendship 4

Many Western chainsaw manufacturers produce tuning kits for their saws to increase power, and service centers have a separate price list with a list of possible modifications. Mainly found in petrol tool service centers in the USA and Germany.

It is also possible to modernize and replace components in order to improve the characteristics of saws from the Druzhba family.

Examples of what can be done:

• Install turbocharging to increase the rate of supply of the fuel mixture;
• Install a more modern carburetor;
• Increase the compression of the fuel mixture;
• Install an electric starter;
• Bore the internal combustion engine and install an enlarged piston;
• Install the decompression valve;
• Leave one piston ring to reduce cylinder running resistance.

In general, the chain saw in question is a paradise for the implementation of engineering ideas. Craftsmen all over Russia assemble various devices, from a boat motor to a bicycle, based on this gasoline saw. We recommend reading an interesting article about what you can make from a Friendship 4 chainsaw with your own hands.

Device

The main parts of the chainsaw are as follows:

• engine;
• sawing apparatus;
• frame with handles;
• gas tank

The engine is a single-cylinder two-stroke carburetor. Cooled by air flow created by a centrifugal fan. The engine and sawing apparatus are independent units, connected into 1 unit with flange fasteners and secured with a clamp.

When the fuel tap is opened, fuel enters the diaphragm carburetor, which ensures uninterrupted supply to the engine at any angle of inclination and strong vibration. The design of the chainsaw does not allow the engine to stop if the chain gets jammed in the barrel while cutting wood.

The handles are located high, which provides the following capabilities:

• do not bend over while working and get tired less;
• work in deep snow conditions;
• increase user safety.

Chainsaw models

Despite the fact that currently the gasoline saw of this model belongs to the category of outdated units, the device shows quite decent characteristics:

• the presence of a single-cylinder, two-stroke, carburetor engine MP-1 with air cooling and a working volume of 94 cubic meters. cm;
• power 4 l/s;
• the gearbox consists of a housing and two bevel gears;
• a mixture based on oil and gasoline is used to lubricate the engine;
• The design of the engine and sawing apparatus of the chainsaw is represented by independent units connected between a flange connection and a fixed clamp.

This layout option allows you to work with the sawing apparatus at any angle and quickly replace a failed unit with your own hands. Functional completeness and ease of installation made the device easy and reliable to use.

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The main disadvantage of the Druzhba saw is its significant weight, amounting to 12 kg, as well as the presence of a removable cable starter, which is not very convenient to use and is often lost. Among other things, the design does not have many protective elements that can ensure safe operation, including the “Stop” button, chain brake, and the Anti-kick function. However, the structural simplicity and low cost, combined with high performance, made this unit very popular.

Friendship is a technique from the USSR, and it also left its peak of popularity there. Despite the modernization and production of seemingly high-quality chainsaws “Druzhba-Altai” and “Druzhba-Electron”, they no longer find such widespread use due to very strong competition.

Chainsaw Druzhba-Altai

However, those who have remained faithful to the Druzhba chainsaw unanimously insist that it simply cannot be found better than this chainsaw. Its design is simple, parts are always available, and is easy to maintain. The 4 horsepower motor will cope with any tasks and in any weather conditions.

Druzhba chainsaws today have almost the same design as the first models. Some details have been modified. By paying attention to the name, you can see the numbers that indicate power. For example, if you have a Friendship 2 chainsaw in front of you, this indicates that its power is 2 hp. With.

In the first models, the handles were fixed on the fan cover; later they began to be attached to the clamp connecting the motor and gearbox. Until the 80s Models marked 4 A were produced. They had a KMP-100 carburetor and a contact magneto. For the first time, these devices began to use automatic chain lubrication. Later, this device was discontinued, and instead they began to produce a unit with electronic ignition called “4A-Electron”.

In the 90s the old carburetor was replaced with a new one - KMP-100U. They started calling the saw “Druzhba-4M” and additionally equipped it with updated chains. Based on the chainsaw, the Ural saw was developed, which had more outstanding characteristics. One of the latest models, Druzhba 5E, has a similar design.

The overall design of the saw has not changed significantly over time, only individual parts have been modified. The number at the end of the model name indicates its power, for example, Druzhba 2 - 2 hp. In the first chainsaw produced, the handles were attached to the fan cover; later they began to be attached to the clamp that connected the gearbox and the engine.

In the 90s, the previous carburetor was replaced with a new KMP-100U. The chain saw became known as Druzhba-4M and was equipped with updated chains. Based on the Druzhba chainsaw, the Ural saw with more powerful characteristics was developed. The latest model produced with a similar design is Druzhba 5E.

The two-stroke MP-1 engine, rated at 4 hp, which gave it the number 4 in its name, developed for this chainsaw in 1953 at the Zaporozhye “Progress”, was, and remains, so easy to repair and maintain that it ensured its success for many decades.

But Druzhba-4 did not deserve its popularity with a single engine. The layout, convenient for long-term work, allows the feller to work standing, in a comfortable position, cutting trees almost close to the ground, and is not repeated in any other saw, except for those that are only its modifications. How many were there?

Significant - really one, when the saw acquired a new, more powerful (5 hp) engine, gearbox with a saw chain lubrication system and the name “Ural”. It’s not worth talking about little things like the shape of the tank. And the reduction in weight, which is still hardly the biggest drawback of this design, from 12.5 to 11 kg, cannot be called a significant achievement.

The saw, which received a gold medal at the Brussels exhibition in 1958, was mass-produced until the end of the 90s with minor changes:

• in the 60s, changes were made to the handle fastening;
• in the 80s, the carburetor (“Druzhba-4A”) was replaced and electronic ignition (“Druzhba-4A-Electron” was installed);
• in the 90s, another new carburetor (“Druzhba-4M”) was installed.

The next stage was actually the creation of “Ural”, but it is only a development of “Friendship”.

Other modifications of this saw mentioned in some sources are the fruit of the authors’ imagination. The recently released Druzhba-2 saw has a traditional layout for this tool, similar to the models of market leaders Shtil and Husqvarna, and apart from the name, it does not in any way resemble its legendary predecessor.

Advantages of “Friendship-4”:

1. Ease of use when felling wood.
2. High maintainability.
3. Simplicity of design.
4. Low cost.

Also among the successful design features is the fastening of the gearbox using a clamp, which allows you to rotate it at any angle, which makes it possible to position the saw bar in a horizontal plane. A simple centrifugal clutch in which the outer L-shaped profile of the drive drum, as the speed increases, is pressed against the walls of the driven protrusion mounted on the gearbox, ensuring the transmission of torque.

Disadvantages of a chainsaw:

• Poor safety system (no automatic brake, stop button, vibration protection, etc.).
• Removable starter, which is often lost.

• Heavy weight.
• Low quality of spare parts.

The close relationship between “Ural” and “Druzhba” makes it possible to actively use spare parts from the first to the second. This is how saws made in the 60s gain a second youth after installing lubricated gearboxes with modern saw bars and chains.

And spare parts for Druzhba are still produced by many manufacturers and are not in short supply.

Moreover, based on its engine, not only saws were produced, but also motor pumps, winches, autonomous power stations and much more.

Characteristics

Over the 60 years of production, the design of the Druzhba chainsaw and its characteristics have changed insignificantly.

The general parameters are:

• weight when fully equipped - 12.5 kg;
• dimensions - 865x460x500 mm;
• saw bar length - 450 mm;
• The fuel tank capacity is designed for 1.5 liters of fuel liquid;
• spark plug - any with a diameter of 17 mm.

The main difference between the modifications is power. It is indicated by the number in horsepower at the end of the model names.

Friendship 2

The technical characteristics of this model are as follows:

• engine power - 2.2 kW;
• saw starting type - manual;
• lack of a rotary gearbox.

What makes Druzhba 2 different from the first model is the presence of a device for braking the chain, which made it safer: the tool cannot accidentally injure the worker or the people around him. The material from which the case is made is reliable and can withstand any temperature changes.

Friendship 4

This model received a gold medal at the World Technology Exhibition in Brussels in 1958.

The technical characteristics of the chainsaw are as follows:

• power - 2.94 kW;
• engine oil tank volume - 150 ml;
• total shaft rotation speed - 5000-5400 rpm;

A gas-powered saw can cut through a trunk with a diameter of up to 50 cm in 1 minute.

Friendship 4M electron

The Druzhba 4M electron chainsaw is distinguished by the fact that this model is equipped with an electronic non-contact ignition system, which significantly increases the reliability of the engine.

The technical characteristics of 4M are as follows:

• power - 3 kW;
• fuel consumption - 720 g/kW h;
• the distance between the spark plug electrodes is within 0.6-0.7 mm.

The inner walls of the aluminum cylinder liner are plated with chrome to increase wear resistance. The model is equipped with rubber shock absorbers that reduce the transmission of engine vibration to the handles. The Druzhba-4M model uses a KMP-100U carburetor, and with the Druzhba 4A modification, the use of forced chain lubrication began due to the installation of an oil pump. This made it possible to significantly increase the service life of the chain and guide bar.

Specifications

Advantages and disadvantages

The advantages of the Friendship saw are:

• long service life;
• simple device - you can quickly access any node without much difficulty;
• smooth and precise cutting;
• high performance;
• maneuverability;
• All parts are reliably protected by a durable casing.

The successful design of the Druzhba 4 chainsaw engine made it possible to use it in the production of walk-behind tractors, lawn mowers, and also to develop on its basis the SD-60 engine for driving stationary installations - generators, pumps.

The disadvantages of a chainsaw include the following:

• heavy weight;
• removable rope starter.

How the Druzhba chainsaw works (video)

Check all connections for strength, reliability and tightness. If the engine of the Druzhba chainsaw remains operational only at low speeds, and if there is a significant load, the unit quickly stalls, then with a correctly adjusted carburetor, you should pay attention to the muffler system. As a rule, this problem is associated with clogging of this unit. Clogging of the muffler spark arrestor is especially common in the following cases:

• use for filling the fuel system with a mixture of low-quality oil;
• use for filling the fuel system with a mixture with a high oil content;
• use for filling the fuel system with a mixture containing oil not intended for this type of engine.

If the cause of a malfunction in the operation of the saw is discovered, it is necessary to dismantle the muffler and thoroughly clean it using any detergents, and then dry it with a hairdryer. A prerequisite is to replace the fuel mixture with the optimal composition, which is recommended for use by the equipment manufacturer and is specified in the operating instructions supplied with the chainsaw.

Operation, maintenance and repair

To ensure trouble-free operation of the saw, it must be adjusted periodically. The operating instructions supplied with the equipment describe the features of setting up the model. Incorrect configuration will lead to unbalanced operation of the nodes.

How to adjust the carburetor

Failures occur when not enough or too much fuel is supplied, as well as if the proportions when mixing fuel with air are violated.

Carburetor adjustment is carried out as follows:

1. The fuel regulating screw is first turned all the way, and then back (counterclockwise) 1.5-2 turns.
2. Start the engine, warm it up for 1-2 minutes and turn the T screw in one direction or another to ensure its stable operation at maximum speed. The chain should not move along the bar at idle speed.
3. Check and, if necessary, seal the connection between the carburetor and the cylinder.

It is easier to adjust the carburetor using a tachometer, but at home, in most cases, engine operation is adjusted by ear. When both the quantitative and qualitative fuel supply is normal, the engine does not overheat, does not choke, runs smoothly, without sharp sounds. When adjusting, turn the screws slowly, without jerking.

How to set the ignition

Stable operation of the engine is ensured by correctly adjusted ignition - the Druzhba 4 chainsaw in this case will consume a minimum amount of fuel. The saw is ignited thanks to a magneto using a spark plug and a special wire.

To monitor the quality of the spark for igniting the chainsaw, place the spark plug on the cylinder body and pull the starter. If the spark plug is in working condition, a spark will jump between the electrodes. A weak spark will not ignite the fuel; such a spark plug must be replaced.

It is better to replace the contact ignition of a chainsaw with an electronic one. This will eliminate constant problems with its regulation. It is necessary to ensure that the ignition coil mounting screws do not loosen.

Basic malfunctions and their elimination

If you know why the tool malfunctions, you can repair it yourself at home.

Chainsaw Druzhba-4: instructions for repairing and replacing spare parts with your own hands

Before starting the chainsaw, it is necessary to install and adjust the saw set (bar, chain and sprockets), otherwise the saw will immediately lose its clutch. Friendship chainsaw characteristics Any new chainsaw (as well as a newly installed chain or bar) definitely needs processing.

To do this, it is advisable to run the chainsaw for 40-45 minutes at low speeds (this approximately corresponds to the exhaustion of the fuel tank), then turn off the engine and check the chain tension. Next, you need to make several cuts, applying little effort, and only then proceed to active use. All this is done so that the sprocket, bar and chain warm up well, and the oil gets onto all lubricated parts of the saw set. After the obligatory pre-start check and refueling with fuel and oil, the saw is ready for work. Next, you need to pull out the choke, completely remove the slack in the starting cable and give a strong jerk starter to start the tool (if the tension is sluggish, there is a high risk of flooding the spark plug, which will somewhat complicate subsequent starting attempts). If everything is done correctly, the saw starts the first time.

When purchasing a chainsaw, buyers often ask the question of whether they need to put pressure on the chainsaw when cutting. First of all, it depends on the condition of the saw set, and in particular the chain. When working with a dull chain, the efficiency of cutting decreases significantly, and the need to apply effort increases.

In addition, in this case there is a higher probability of the saw failing, as the load on the engine increases. Therefore, with a professional approach to the process, it is recommended to regularly adjust the chain (for example, at the end of the working day), and for home use, sharpen it after every 2-3 work sessions.

You should definitely pay attention to the features of seasonal operation of the tool. If the saw operates at low temperatures, then it is necessary to provide for the possibility of warming up the carburetor during operation. In addition, it is advisable to first warm up the saw (if it was stored in an unheated room) to avoid undesirable consequences due to the presence of condensation

Those who want a long-lasting chainsaw should follow these ten tips from the manufacturers.

No. 1. Be sure to read the chainsaw operating manual. Any time you have any questions regarding the operation of the tool, you should contact the service center.

No. 2. During operation, the chainsaw chain should not sag or be too tight. Only use fresh fuel and oil. The proportions for mixing them can be found in the instructions.

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No. 3. For safety, be sure to wear special clothing and protective elements (goggles, gloves, helmet, etc.). No. 4. Before starting the chainsaw, you should take a stable position and make sure that there are no children or animals nearby.

No. 5. Before starting, you should check for fresh fuel in the carburetor.

No. 6. For the best operation of the chainsaw, it is imperative to ensure that the chain teeth do not become dull. If this happens, special tools should be used for sharpening.

No. 7. After each use of the chainsaw, it should be cleaned with special products purchased from the dealer.

No. 8. The chainsaw should be stored in a dry place in a special case. In this case, the fuel and oil tanks must be empty.

No. 9. To store the saw for a long time without use, the oil tank must be filled with special oil, and then, after starting the saw, allow the oil to cover the cutting surface.

No. 10. In order for the saw to serve its owner for a long time, it should be periodically taken to a service center for preventative maintenance.

You have purchased one of the most advanced instruments in the world. And so that it pleases you for many years, we would like to give you some recommendations and note what you need to pay special attention to.

Before putting into operation, no preliminary running-in of the engine is required - the saw is ready for use. In the first hours, you should work with minimal load on the engine in a cyclic mode (sawing for 1-1.5 minutes, then idling for 10-15 seconds). The engine acquires maximum power after 8-10 full fills of the fuel tank.

Attention: do not run the engine at idle speed, because the formation of a large amount of carbon deposits from unburnt oil leads to sticking of the piston rings and failure of the cylinder and piston.

Thanks to its simple design, you can repair the Druzhba chainsaw yourself. For example, saws of this brand often have problems with ignition, especially if a contact one is installed. It is extremely sensitive to various oils and gasoline. Therefore, it is better to purchase electronic ignition instead. Moreover, contact spare parts for the friendship chainsaw are expensive and irreplaceable.

If the spark plugs are heavily flooded, you should pay attention to the carburetor. In this case, it is necessary to bend the gasoline valve slightly inward; as a result, the amount of fuel supplied will decrease and the spark plugs will stop getting wet.

The carburetor is also easy to adjust:

1. The fuel screw is screwed in completely and unscrewed back 3 turns.
2. Close the propeller completely and turn it back 2 turns.

Compared to other models, the Druzhba chainsaw is sold at a lower price due to the small number of functions, but has excellent quality and a long service life, which imported models cannot boast of.

Any saw that you purchased from an official dealer and entered the Russian market through official means must have instructions in Russian. We strongly recommend that you familiarize yourself with it before you start using a chainsaw. Before starting the chainsaw, it is necessary to install and adjust the saw set (bar, chain and sprockets), otherwise the saw’s clutch will immediately fall out.

Any new chainsaw (as well as a newly installed chain or bar) definitely needs to be treated. To do this, it is advisable to run the chainsaw for 40-45 minutes at low speeds (this approximately corresponds to the exhaustion of the fuel tank), then turn off the engine and check the chain tension. Next, you need to make several cuts, applying little effort, and only then proceed to active use. All this is done so that the sprocket, bar and chain warm up well, and the oil gets onto all lubricated parts of the saw set

After the obligatory pre-start check and filling with fuel and oil, the saw is ready for work. Next, you need to pull out the choke, completely remove the slack in the starting cable and start the tool with a strong jerk of the starter (with a sluggish tension, there is a high risk of flooding the spark plug, which will somewhat complicate subsequent starting attempts).

If everything is done correctly, the saw starts the first time. When purchasing a chainsaw, buyers often ask the question of whether they need to press on the chainsaw when cutting. First of all, it depends on the condition of the saw set, and in particular the chain. When working with a dull chain, the efficiency of cutting decreases significantly, and the need to apply effort increases.

In addition, in this case there is a higher probability of the saw failing, as the load on the engine increases. Therefore, with a professional approach to the process, it is recommended to regularly adjust the chain (for example, at the end of the working day), and for home use, sharpen it after every 2-3 work sessions.

Although these saws stopped being produced at the turn of the millennium, a huge number of them are still in use and sold on the Internet. Some are far from exhausting their resources. But even those that have lost their appearance and acquired problems in their work are easily restored.

Most often, during repairs it is necessary to change the crankshaft bearings, all seals and gaskets.

It will not be superfluous to replace the piston rings during disassembly. It is also possible to install a repair size for the piston group.

If your chainsaw has a gearbox without lubrication, then it is worth installing a more modern one. This will extend the life of the saw chain.

Such a new one from Ural costs about 3.5 thousand rubles, but with the cost of a slightly used Druzhba being 4 - 5 thousand rubles. this price may seem excessive. The same applies to other elements. So, if your contact ignition is working, then trade it for a new one or install an electronic one for 500 - 600 rubles. maybe it's not worth it. After all, the main problems with it arise due to damage to the crankshaft oil seal, and when replacing it, everything can return to normal.

A removable starter costs the same amount, so it’s better not to lose it. Some fasten it rigidly with self-tapping screws in a regular place and put up with certain inconveniences in work, and some fix it on a cable and find a place for it on the handle of the chainsaw.

It is cheaper to repair a carburetor using a repair kit.

The cost of a new one is about 1 thousand rubles.

Before you start working with the Druzhba chainsaw, you should read the operating instructions. This will help you understand the principle of operation and design of a gasoline saw, as well as prevent possible breakdowns and harm to the operator. Better yet, find an experienced owner and ask him to instruct him.

You must be careful when carrying out work. When felling trees or trimming branches, carefully consider where they will fall so that they do not harm the operator. When sawing a log house, start from the base and move towards the crown.

If during the work or before starting any damage is discovered (damage to the handles or cracks on the body, the appearance of smoke or foreign odors), you should immediately stop the work and correct them.

Fuel mixture

• engine;
• gearbox;
• frame;
• sawing apparatus, including a saw bar, a tensioner and a saw chain4
• removable starter;
• supply system;
• lubrication system of the sawing apparatus.

How much does a Druzhba chainsaw cost?

Chainsaw ZiD Druzhba 4 can be bought for 15 thousand rubles. The price of a used unit depends on its condition, the degree of wear of the main elements, the total service life, the presence or absence of all components, a passport and ranges from 1 to 7 thousand rubles. For example, a Druzhba-Altai chainsaw from the 90s, which differs from the basic one in an improved carburetor and saw system, can be purchased for 5 thousand rubles.

Spare parts are in demand. The most worn part - the sprocket - can be bought for 100-150 rubles, the starter - for 600-700 rubles, and the electronic ignition system - for 1 thousand rubles.

Chainsaws "Friendship"

The legendary Druzhba chainsaws come from the USSR. Nowadays, they are no longer produced, but they can be found in the garages of our fathers and grandfathers and, surprisingly, are still in working order. The year of production of the first petrol saw “Druzhba” was 1955. Development began two years earlier. On the territory of the USSR, two machine-building plants were engaged in the production of these chain saws: Perm and Biysk. The developers were constantly improving things and introducing new technologies.

These changes can be observed in chronological order:

1. 1953 - the beginning of the development of the first chain saw “Druzhba”.
2. 1955 - the first chainsaws “Druzhba-2” (the saw handles are attached directly to the fan) and “Druzhba-4” (the handles are attached to the clamp connecting the motor and the saw gearbox) came off the assembly line; serial production of chain saws was launched.
3. 1958 - victory at the international exhibition in Brussels, after which chain saws began to be supplied abroad.
4. 60-80s - production of the modernized Druzhba 4-A chainsaw, a chain lubrication system, magneto and KMP-100 carburetor appeared.
5. 1990 - modernization of the Druzhba 4A chainsaw, release of the improved Druzhba-4A-Electron model. In this model, electronic ignition was installed for the first time and a new KMP-100U carburetor was installed.

The production of the latest modernized chainsaws Druzhba 5E and “Druzhba-Altai”, “Druzhba 60” was carried out at the Altai Machine-Building Plant in the 90s and until 2015.

History of modifications of the Druzhba chainsaw

Druzhba is one of the first chainsaws that appeared in the USSR. Its prototype is the good old “Friendship-2”. The first production of the Druzhba-4 chainsaw took place in 1955 at the plant named after. Dzerzhinsky in Perm. This was a modification with the handles attached directly to the fan cover itself. Over time, it was transferred to the clamp that connects the engine and gearbox. Then from 1960 to 1980. The Druzhba-4A chainsaw was produced. It already had a magneto and carburetor installed.

In 1990, a design change was made in the form of electronic ignition, and the production of Druzhba-4A-Electron gasoline chain saws began. The latest modernization that was born and still lives is “Druzhba-4M”. She received a new type of carburetor KMP-100U. They are already produced at.

Review of the model range of the first Soviet gasoline saws “Druzhba”

The first Druzhba chain saws were not particularly ergonomic and safe, but they were popular and in demand not only in the Soviet Union. They did not have a chain brake, vibration damping system, or chain lubrication. All they had was heavy weight (more than 13 kg) and high power. These chainsaws were used in logging sites, since their main purpose was and remains felling trees and cutting logs of different thicknesses. So, Soviet MashProm released the following modifications of the Druzhba chain saws:

1. Chainsaw “Friendship 2”.
2. Chainsaw “Friendship 4”.
3. “Friendship 4-A”, chain saw.
4. Modernized saw "Druzhba-4A-Electron".
5. Chainsaw “Friendship 4M Electron”.
6. “Druzhba-5E”, chainsaw.
7. “Druzhba-Altai” chain saw.
8. Petrol-powered saw “Friendship 60”.

Let's take a closer look at each modification of these legendary saws:

Chainsaw “Friendship 2”

This chainsaw has a durable aluminum body and is equipped with a two-stroke single-cylinder internal combustion engine with a power of 2200 W, or 2.99 horsepower. Starting the chainsaw manually, from the starting cable. Massive handles are attached to the fan; vibration dampers, chain lubrication and a braking system are still missing. There was only one way to stop the chainsaw - by cutting off the fuel supply to the engine. The length of the saw bar reached 45 cm. The massive appearance and solid weight of the chainsaw (12.5 kg), as well as shortcomings regarding safety, were an incentive for new developments.

Technical characteristics of the “Friendship 2” chainsaw:

Sources:

https://benzopilok.ru/remont/druzhba-4.html https://specmahina.ru/benzopila/druzhba.html https://opilah.ru/benzopily-tcepnye/obzor-benzinovyh-pil-druzhba