Chainsaw Friendship. History of model modifications and their operation

This is equipment originally from the USSR, which will always remain in demand, despite the fact that now electronic models are increasingly replacing gasoline ones. This is a whole era! How many years have passed, but it does not lose its popularity. A distinctive feature of Druzhba chain saws is reliability, ease of operation and low cost. And all this combines perfectly in this chainsaw! It can be found in a large number of Soviet films; it was an indispensable assistant when felling trees in the taiga and preparing firewood for the winter over a long period of time.

The main disadvantage of the Druzhba chainsaw is the impressive weight of the device and because of this the operator needs to periodically stop to rest.

If you are interested in how much a Druzhba chainsaw will cost, then the answer will be from 3,000 to 4,000 thousand, depending on the condition and modification.

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.

Advantages and disadvantages

Like any other tool, the Druzhba-4 chainsaw has its pros and cons. Therefore, before acquiring this tool, it is necessary to weigh the pros and cons, only in this case the saw will not only become a profitable purchase, but will also bring a lot of benefits to its owner.

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The main advantages of the Druzhba-4 brand saw:

• simple and durable design;
• ability to work in the most difficult conditions without a break for 50 minutes;
• long handles that provide high safety, reduce vibration and allow you to saw absolutely comfortably in a standing position;
• all main components of the saw are located within maximum accessibility, which speeds up the process of replacing worn parts;
• chain movement occurs only at high speeds;
• Low-octane gasoline can be used as fuel for the saw;
• the presence of an emergency chain brake;
• when the chain gets stuck, the saw does not stall;
• despite its age, the tool makes it possible to create an even cut regardless of the thickness of the wood;
• long service life (with proper care about 15-30 years).

Important! After every 24 hours of operation of the saw, it is necessary to clean it from soot scale and partially disassemble it. Otherwise, the wear of tool parts increases significantly.

There are not many disadvantages to this unit:

• The saw is heavy, so not everyone can handle it;
• due to the fact that the starter of a chainsaw is removable, this unit is often lost quite often;
• “Friendship-4” does not have a “Stop” button, so it must be turned off at every break;
• purchasing good components and spare parts for this saw is not so easy, since most modern manufacturers produce low-quality parts with a short service life, so you can only buy good spare parts at flea markets.

If you have the tools, it will not be a problem to build a cellar with ventilation, a sheepfold, a chicken coop, a veranda, a gazebo, a pergola, a fence, a blind area of ​​a house, a hot and cold smoked smokehouse, a path made from saw cuts, a bathhouse, a gable roof, a wooden greenhouse, an attic.

Specifications

The best models of chainsaws Caliber

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.

User manual

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.

When carrying out work in winter with a Druzhba chainsaw, do not immediately put a load on the engine, but wait 2-3 minutes for it to warm up.

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.

When working with a Druzhba chainsaw, the operator must wear protective clothing: goggles, overalls, boots.

Fuel mixture

The Druzhba chainsaw runs on a mixture of oil and fuel. A distinctive feature of this tool is its unpretentiousness to the quality of lubricant and gasoline. Any oil can be used for two-stroke saws, and gasoline should be AI-92 or AI-95. The user manual recommends diluting gasoline and oil in a ratio of 1:25.

To lubricate the chain, any chain oil is used, and often just motor oil.

Instructions for first launch

It is possible to find a new Friendship now, but it is very difficult. Increasingly, these models are simply inherited and will continue to be used for a long time. Therefore, it is already completely ready for work, just fill in the oil, tighten the chain and start working.

Signs of a dull chain and the consequences of further use

The difficulty of working with a dull chainsaw should not be confused with the difficulty of cutting hardwood or very dry logs. In all these cases, the speed of the operation is reduced, but the blunt instrument has a certain behavior - signs by which one can judge the need for sharpening:

• the chainsaw does not immediately bite into the tree trunk, as if grinding, moving away from the point of contact;
• when cutting soft rocks, the tool sluggishly penetrates the thickness of the wood, you have to put pressure on the bar;
• the shavings from large ones with characteristic oblong particles turn into small thyrsus, which very rarely crumble;
• the chain heats up quickly, an unpleasant smell of burning oil for lubricating the guide bar is heard.

In addition to these alarming signals, always after hitting metal nails, wires with a chain, or burying a chainsaw in the ground, you can be one hundred percent sure of the need for subsequent sharpening of the cutting edges.

What can happen to the instrument in the future if the problem is ignored? The most harmless thing is that it will be impossible to work with a chainsaw; in the end it will get boring and will force you to service the unit. But adherents of the saying “You don’t need intelligence to eat power” can come to the following conclusion:

• extra stress on the body, because, frankly speaking, you have to put pressure on the tool so that it cuts;
• excessive fuel consumption of up to 30%, which is explained by the need to go through a larger revolution cycle to achieve the same result;
• accelerated wear of the tire and other parts of the chainsaw.

In addition to all these negative consequences of a dull saw, there is a high probability of the chain jamming in the barrel and injury to the operator performing the work.

Description of main faults

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.

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.

Operation and service of the Druzhba saw

Tools, equipment and technologyRecommendations for selection. Operation, repair and maintenance. Malfunctions and ways to eliminate them.

Chainsaw Friendship 4 won't start at all. How can you get out of this situation?

Install an imported spark plug, analogue A11 2. Fresh gasoline in a ratio of 15/1 with oil. Open the tap at the gas tank. Press the pump button on the carburetor (in the center of the diaphragm) and wait until gasoline flows. Press and hold the gas trigger and start by pulling the starter handle. If it does not start - Unscrew the spark plug and see if it is wet - if it is wet, then look for a spark - if not, then most likely the carburetor membrane is stuck - rebuild or replace the carburetor.

Where is the ignition timing adjusted on the Friendship 4 Electron chainsaw? I didn't find something. Should I buy it or is the current still weak? If so, which one should I take, imported?

You don’t need an imported one, take a standard domestic one. A10 or at worst A11, or better yet a couple. Electronic ignition is adjusted by moving the disk in the magneto (you will see for yourself there, two screws need to be loosened).

For the Druzhba-4M chainsaw and two-stroke oil. The instructions say that only AC8, and 2T oil is not allowed. Who mixes gasoline with what and in what proportion?

Any 2t oil in a ratio of 1:15 and everything is fine. Don't trust the instructions. Where does it say that you can’t use 2 tons of oil? I have such instructions, but this is not there. Friendship is good because due to low speeds it can consume any 2 tons of oil.

The problem is this: when the tire plunges to its full width, it jams, I have to twist the log 3-4 times just to file it, and it turns out that the top of the cut and the part that is in front of me goes straight, and the bottom of the tire that is at the exit in front of the log, leads to the left, which is why the cut turns out to be a figure eight and the tire jams. I took off the tire and didn’t seem to find any bends, but the chain itself somehow warped from the bottom to the front to the left, I changed the chain, it’s not new either, it’s about the same. You can only saw a thin log without twisting it, a little wider than the tire itself, and even then the bottom cut leads to the left if you don’t try to force it to the right. What's wrong?

Option one – the chain is sharpened incorrectly, option two – uneven wear on the edges of the groove.

Tell me how to adjust the idle speed of the engine on the Druzhba 4 Electron chainsaw?

It is recommended to adjust the idle speed of the chainsaw engine in the following sequence: start the engine and warm it up at low and medium speeds. Use the screw to set the minimum stable speed at which the saw chain does not move along the bar. If the engine smokes heavily (a sign of an overly rich mixture), then partially tighten the carburetor screw. At the same time, engine speed will increase and exhaust smoke will decrease. After this, you should again set the minimum stable engine speed by partially unscrewing the screw. After this adjustment, it is necessary to check the engine response. To do this, sharply press the throttle control lever all the way for 2-3 seconds. In this case, the chainsaw engine should quickly gain momentum. If the engine stops or has a “dip” in power, that is, it slowly picks up speed (lean mixture), then it is necessary to partially unscrew the carburetor screw. Check engine response again. After completing the adjustment, secure the screw with nuts.

Help me find the parameters for sharpening Soviet plate chains for the Druzhba 4 saw. My household machine does not sharpen these chains, only combined ones.

I could be wrong, I haven’t sharpened such chains for a long time, but it seems like this: the slope from the vertical on all teeth is 10 degrees, the angle of the external teeth, I remember, is 30 degrees, from the axis or perpendicular. The angle of the middle teeth is, like, 20. The angle of the internal (pushing) teeth is perpendicular to the chain axis. They sharpen only on the front edge, the top cannot be touched.

I have a Friendship 4 contact chainsaw, judging by the inscription on the snail, from 1965, well, the head and everything else looks fresh from 1985, but it looks like new). Yesterday, while I was starting it up, the ratchets licked, what’s on the starter, what’s on the saw itself, can I somehow restore it? And it even started and worked, so I sawed it yesterday and after I turned it off and wanted to start it again, there was such a problem with the ratchets. Tell me what to do?

Carburetor settings

The carburetor in the Druzhba chainsaw is responsible for the fuel supply. And you need to be able to customize it for a specific type of work. There can be many reasons for incorrect carburetor settings: heavy load, increased vibration, poor quality of the fuel mixture, etc. Signals that the carburetor has been adjusted incorrectly are:

1. Loss of power.
2. The gasoline saw does not hold idle speed.
3. Excessive fuel consumption.
4. Production of smoke or excessive soot.
5. Difficult to start or stalls during operation.

Adjusting the carburetor is very simple, the following sequence will help you figure it out:

1. There are two screws on the chainsaw that are responsible for supplying fuel at minimum and maximum speeds, and the essence of the adjustment is to change their tension under different loads.
2. Initially, you should adjust the supply of the fuel mixture at low speeds.
3. Then adjust with another screw at maximum power.
4. Adjust operation at idle speed.
5. Double-check all modes again.

Adjustment work

To ensure uninterrupted operation of the chainsaw for a long time, “Druzhba-4” requires timely adjustment of the main working components of the unit. This process includes adjusting chain tension, clutch tension, fuel quality and rpm. Let us consider in more detail the main stages of adjustment work.

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Carburetor

The carburetor consists of a diaphragm with an enrichment button, a fuel chamber housing, a diffuser housing, a cover, a throttle with a needle and a cable cup, and an air filter. Its adjustment makes it possible to change the number of engine revolutions at maximum power and during idle. This directly affects the quality of the functions performed by the saw.

Carburetor diagram
To adjust the number of revolutions during idle, you need to change the quality and quantity of fuel supplied to the cylinder. The volume of the injected fuel mixture is regulated by the throttle. The throttle is controlled using a lever located on the right handle of the frame. The quality of the mixture is regulated by the carburetor screw. When screwing it in, the mixture is purified, and when unscrewing it, it is enriched. When adjusting the operation of the saw in idle mode, it is necessary to adhere to the following standards in its operation:

Carburetor adjustment

• the engine must function steadily and confidently;
• minimal amount of fuel combustion waste;
• the engine must have excellent throttle response.

Regulation of engine operation at high speeds is carried out by changing the position of the throttle needle. When it rises, the combustible mixture is enriched, and when lowered, it is purified. The most advantageous position of the needle is determined independently through trial and error. In this case, the following requirements for the operation of the tool should be used:

• at full load, the chainsaw should develop high power with a minimum amount of gaseous waste;
• During operation, the engine should not overheat (motor overheating is the first sign of low fuel), reduce speed or stop at maximum load.

Important! It is prohibited to operate the Druzhba-4 saw without an air filter, as this will lead to premature engine wear.

Clutch

The clutch consists of the following parts : a drive disc with 2 rings, a driven disc with an L-shaped rim. The rim rings of the drive disc are secured with keys. The drive disk is mounted on the splined end of the crankshaft, the driven disk is mounted on the shaft end of the gearbox drive wheel. This unit is adjusted only when, during operation of the saw, the chain begins to move independently along the bar. This occurs due to the loss of elasticity of the coupling rings during operation.

In order to return the rings to their former functionality, they are straightened by peening using the sharp edge of a hammer. Hardening should be done from the outside, across the ring, evenly across its entire plane. As a result of the procedure, the gap in the ring lock should decrease significantly. To remove the lateral spread of the ends of the ring, you just need to bend it by hand.

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Chain tension

The chain tension is adjusted after replacing the old chain with a new one, as well as during its break-in, since it can stretch quite quickly during operation. This kind of procedure is performed by rotating the screw of the tensioning device.

When adjusting this unit, you must strive to ensure that when the lower branch of the chain is pulled away from the bar in its central part, the edge of the connecting link of the chain is at a distance of no more than 10 mm from the edge of the bar. In this case, the tensioned chain should move freely along the bar by hand.

Did you know? Due to its functional completeness and reliability,
in the 60s of the twentieth century. The engine from the Druzhba-4 saw was actively used in Soviet aircraft construction. On its basis, light helicopters X-3, X-4 and X-5 were created.

Sharpening teeth

When working with a Druzhba chainsaw, the main load falls on the chain. Therefore, it is important to monitor its condition and periodically sharpen it. The first signs that the chain is dull are:

1. Large vibration when cutting.
2. Chain oil consumption is too high.
3. Not a straight cut.
4. Requires high cutting forces.

The rules for properly sharpening teeth on a Druzhba gasoline saw are given in the operating instructions. To do this, you will need a round and straight file, and a depth gauge template. If you can’t sharpen the teeth, you can always skip the repairs and find a new chain on the market.

What to do with spare parts

You won’t find spare parts for the Druzhba 4 chainsaw in stores; after all, it’s already a rarity. The only place where you can still buy them is at a flea market - a market where grandparents sell what they have lying around at home. Believe it or not, you can find many spare parts there in new condition. They lay there for a long time, but were never put on the saw.

Another place is bulletin boards, like Avito. They especially often sell chains and tires for Druzhba chainsaws.

The Druzhba 4 chainsaw is as simple as a Kalashnikov assault rifle, thanks to this it is durable (especially models from the 50s and 60s), easy to maintain and repair. The saw can be easily repaired in the field “on the knee” without special tools. On your farm, it will be useful for harvesting timber or firewood in small quantities. For professional work, it is still better to use modern saws. Everything said in the article is confirmed by numerous reviews from Internet users.

The seller provides the following guarantees:

1. For BMW passenger cars and SUVs – a two-year warranty for the entire vehicle without mileage limitation, according to the standards of the Vehicle manufacturer BMW AG from the date of first registration of the Vehicle; The warranty period for additional equipment that was not manufactured and/or installed by BMW AG is determined in accordance with the warranty conditions of the manufacturer and/or the company installing the relevant equipment; · A change in the owner of the car does not affect the Seller’s warranty obligations regarding the Car, go to BMW repair.

2. The warranty is void if: · The seller does not report the defect in a timely manner or does not provide the opportunity to immediately eliminate the reported defect; · The vehicle has been overloaded, misused or used for competition or rallying; · The vehicle is modified in a way that is not accepted by BMW AG; · The Seller did not take into account the instructions and rules for the operation and maintenance of the Car.

3. The warranty is not valid and costs are not covered in case of natural wear and tear of the Vehicle, as well as when replacing components in case of natural wear and tear (tires, spark plugs, windshield wipers, brake pads, discs, etc.). The warranty does not cover costs associated with periodic maintenance of the Vehicle, adjustments and inspections, as well as costs or damage resulting from the Vehicle's downtime.

4. The warranty becomes invalid upon expiration of the period specified in paragraph 1.

*BMW AG reserves the right to make changes to certain clauses of the warranty conditions. You can obtain more detailed information from our warranty specialists.

Spark plug setting

In order to ensure normal engine operation, the spark plug must have an adjusted electronic gap and be free of lubricant, slag and carbon deposits. This is done so that the spark passes through it normally and does not disappear, and, as a result, the engine does not stall during operation.

To adjust the spark plug, you must do the following:

1. Tighten the fuel screw fully.
2. Unscrew it 3 turns.
3. Screw in the propeller and back it out two full turns.

Seal the transition coupling with any sealant or place a tin strip. Another reason for the lack of a spark may be dirt adhering to the spark plug, in which case you should simply clean it.

Homemade chainsaws Friendship

Another reason for the great popularity of the Druzhba chainsaw is the wide range of possible DIY projects using this tool. In Soviet times, it was used wherever possible. Let's look at the most common models of homemade devices with impressive modifications.

Snowmobile

The popularity of the Friendship chainsaw in the development of a snowmobile is due to the simplicity of the design and disassembly of the device.

The general drawing of the snowmobile is shown in the following photo:

The main thing in the manufacture of a snowmobile is the creation of a drawing in which the transmission, engine and skis should be connected.

The rack manufacturing diagram is shown in this photo:

And here is a drawing of the tracks:

The drive shaft can be made according to the following scheme:

As a steering element, you can take the steering wheel from a regular scooter or bicycle, but there is no braking system provided here; you just need to release the throttle, because you won’t develop high speeds on it.

How to check and repair the ignition unit of a chainsaw.

Currently, the market is saturated with chainsaws of foreign and domestic production, differing in appearance, size, power, but they all have one main detail in common - gasoline engines. The ignition of the fuel-air mixture in the engine combustion chamber in previous domestic chainsaw engines was carried out by a spark obtained from a magneto, which was subsequently replaced by manufacturers with an electronic chainsaw ignition unit (MB-1 and MB-2). You can disassemble the ignition unit in parts and tinker with them, comparing them with working ones, or you can assemble a simple device that will help you determine a malfunction in the electronic ignition unit of a chainsaw in a couple of minutes.

How to make a device for checking the ignition unit of a chainsaw.

The excitation coil (named according to our definitions) is designed to excite an alternating magnetic field into which the electronic ignition unit of the chainsaw being tested is placed. The impulse coil (also named according to our definitions) supplies voltage to the electronic switching system (signal coil), that is, the electronic commutator. Testing the electronic ignition of a chainsaw. Technique for determining if the device is faulty in the ignition of a chainsaw. The principle is this: near the ends of the horseshoe-shaped core, the chainsaw ignition unit under test is placed, and the high-voltage discharge is checked at the output of the high-voltage coil. For the MB-1 and MB-2 units being tested, the output from the pulse (signal) coil is unsoldered (in some cases this can not be done if its resistance corresponds to the standard one). The coils themselves are checked with an ohmmeter (tester) and under voltage. An ohmmeter is used to check the compliance of the ohmic resistance of the coil windings with those specified by the manufacturer. 2. From the coil body to the capacitor terminal ≈ 1Ω. The absence of resistance indicates a winding break. The voltage storage capacitor is checked with a tester or replaced with a known good one. Well, if a spark discharge was not observed when checking the electronic ignition, then the probable reason for this will be a malfunction of the electronic ignition switching circuit. Tips