4 main malfunctions of the Druzhba 4 chainsaw and their repair - from carburetor adjustment and ignition settings to modification

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.

How to adjust the carburetor on a Druzhba-4 chainsaw

Adjusting the carburetor of the Druzhba-4 chainsaw is required when the engine starts to work incorrectly - it stalls at idle, does not pick up speed when gas is applied, and “fails.”

To access the adjusting screws of the KMP-100 carburetor, you do not need to remove the housing cover; they are always open and accessible. There are no screw markings on the carburetor body, like on modern chainsaws. The first screw, which is located closer to the cylinder, regulates the fuel supply at low and medium speeds. The second screw is the main screw, it regulates the fuel supply at maximum speed

Required Tools

A screwdriver (minus) is required for operation. If desired, you can use an electronic tachometer. It will show the number of revolutions before and after adjustment.

General adjustment algorithm

The carburetor is adjusted in different ways. The simplest and most effective is ongoing adjustment during operation.

Lots of gasoline - spin

• The engine is warmed up for 5-10 minutes.
• If in the “full throttle” mode the engine operates as if idling (does not develop speed due to excess gasoline in the fuel-air mixture), the second (farthest from the cylinder) screw is tightened clockwise 1/4 turn.
• If the engine begins to work better, tighten it another 1/4 turn. If the engine starts to stall when the gas is fully applied, the screw is unscrewed back.

Low on gasoline - unscrew

If the engine stalls in the “full throttle” mode (there is not enough gasoline in the fuel-air mixture), the adjustment begins by unscrewing the second screw by 1/4 turn and testing the operation of the engine. If it gets better, unscrew it some more until the engine begins to “choke” and run as if idling at full throttle. Then the screw is tightened back.

After adjusting the second screw, check how the engine operates in the transition from idle to medium and maximum speed. If there are dips, unscrew the first screw 1/4 turn and test changes in engine operation.

As a result, the optimal operating mode of the engine is found through such trial regulation.

Adjusting the idle speed on the Druzhba-4 chainsaw is done using a screw located on the gas handle. Its position determines how far the throttle valve in the carburetor is open at idle.

Idle speed is adjusted based on two requirements:

1. The engine should not stall.
2. The chain should not spin.

Adjustment in a different sequence is possible. The screws are first tightened to the end, then unscrewed by 0.5 - 3 turns (different sources indicate different numbers of turns).

The video shows a simple and understandable process for adjusting the KMP-100 carburetor on the Druzhba-4 chainsaw from the screws position “tightened completely and then turned out”:

For beginners, we recommend watching a more detailed video about adjusting the KMP-100U carburetor of the Druzhba-4 chainsaw. The author of the video tells everything that is useful and everything you need to know. Just a whole step-by-step guide from A to Z.

Step-by-step algorithm

1. Unscrew the fastening screw.
2. Remove the fuel hose.
3. Unscrew the top damper cover.
4. We remove the carburetor.
5. Remove the membrane cover to adjust the level. You need to unscrew 6 screws in a circle.
6. Let's half the body and assess the condition of the membrane, it must be intact - this is the main thing, cracks, scuffs, and tears are not allowed.
7. We evaluate the performance of the mechanism responsible for the operation of the valve.
8. We blow through all the holes and clear out any debris if there is any.
9. We set the level by adjusting the height of the tongue; it should be on the same edge as the body.
10. If everything is done correctly, then by applying, for example, a ruler, you will see that the tongue and the edges of the body are on the same level.
11. We unscrew the screw with the needle from the central jet and assess its condition, clean everything from dirt, if there is any, blow it out in any case. The screw located above, also visible in the photo, is responsible for idle speed; it also needs to be unscrewed, the condition assessed and blown out with air.
12. This completes the cleaning, put everything back together in the reverse order and put the carburetor back on the chainsaw.
13. Don't forget to replace the air filter and pump up the fuel before starting.
14. Let's try to start the chainsaw.

Possible nuances and problems

In any case, when tightening the screws all the way, you need to remember the number of turns made for each screw. This will make it possible to return to the original adjustment if suddenly the chainsaw, adjusted according to the recommendations, does not start at all.

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.

This repair of the ignition system showed an excellent result, the childhood disease of the Druzhba 4 chainsaw disappeared, such a system will work for a very long time.

The only drawback is that the appearance of the chainsaw has changed due to the external coil on the body, and the dimensions have increased. But this is a forced alteration, but the ignition system works reliably and the saw starts at any temperature.

If some points remain unclear, we suggest watching a video on the topic of repairing the ignition of the Druzhba chainsaw.

Chainsaw malfunctions Friendship

Question: Chainsaw Druzhba 2. The primary defect is startup, 3-4 puffs and then it stalls, gasoline drips from the air filter mesh, the spark plug is flooded. What can be done? Answer: Remove the carburetor, unscrew 6 screws. The diaphragm is fine, but there is a lot of dirt, grains of sand, and specks in the working chamber - remove the valve.

Specks on the rubber valve. Wash with a brush, spray with foam cleaner (acetone) and wipe until shiny. We put the valve in place, make sure it is tight by blowing with your mouth. We check the tightness by connecting the fuel hose. We blow out the carburetor with a pump or compressor. We collect. We start the saw, check at speed, idle speed and transient modes (during a sharp release and a sharp increase in gas.

If necessary, adjust the quality of the mixture with a screw, idle speed with a screw on the trigger. The saw should work. Question: Can anyone tell me how to adjust the clutch of the saw at the start of engagement? Answer: This adjustment on the Druzhba 2 chainsaw is made in cases where the clutch comes together at idle engine speed (the saw chain moves along the bar).

The clutch will slip, most often due to the loss of elastic properties of its rings as a result of their overheating during prolonged slipping at high speeds. The restoration of the elastic properties of the rings is carried out by cold hardening, straightening along their outer diameter on a mandrel, the diameter of which is 10-15 mm less than the inner diameter of the ring.

Straightening is done with a sharp hammer head across the ring, evenly along the entire perimeter. Make a smaller stretch at the ends of the rings.

As a result of straightening, the gap in the ring lock is significantly reduced. The lateral spread of the ends of the ring in the lock is eliminated by bending it by hand. Question: A Druzhba 4M chainsaw with an interesting sign of operation is being repaired. When working approximately 10-15 minutes. It stalls and the spark disappears completely.

After cooling (about 20-30 minutes) 10-15 minutes. works fine, and again from the beginning. There is a problem with the ignition, the question is - is there any pattern that the ignition can work like this, or could it be anything, it’s better to change the whole thing? Answer: This electronic ignition appears to be overheating. It's worth trying to change the magneto. You can't fit into the magneto anyway - everything is flooded with something. They say it's difficult to fix. Question: I used a Druzhba 4M chainsaw with electronic ignition, it worked perfectly, last year it stopped starting, I changed the magneto and capacitor - it didn’t help.

I took it apart and dried the magneto on a sunny day, it suffered, there was no spark. I changed the coil and contacts, cleaned it - well, everything is fine.

Then I found the reason - poor contact of the capacitor with the coil wire, corrected it, a spark appeared. I pour about 2 ml of gasoline under the spark plug. syringe, but no cotton. does not light up - the spark seems normal. True, I installed the ignition. so tell me - right or wrong: set the TDC, set the gap in the contacts to 0.25, turn the crankshaft clockwise so that the piston moves 4.2 mm from TDC.

As I understand it, the ignition moment, the contacts begin to open - so did you do it right or not? But realistically, what is the gap in the contacts?

And also on the new contact group the contacts do not match, i.e. that the hat is to the hat, although I looked at the old one, they also don’t quite match, but the truth is a little more even. Could this affect the ignition? Answer: The advance moment is only always before TDC. Apparently you did a very late ignition. Not reaching 2-4 mm from TDC.

Small errors in the gap in the contacts and advance do not critically affect the start. As far as I understand, the size of the gap affects the power of the spark. Don’t be overly burdened with it, but still strive for a regular one. But there are factors that affect the gap. This is basically play in the crankshaft bearing.

If the backlash is huge, then the gap in the contacts can vary, which leads to unstable operation. A more important parameter is ignition timing.

But even here you can make a mistake of 1 mm along the piston stroke, it’s not scary. But it is no longer desirable. It can be properly adjusted only with the help of a strobe using pre-applied marks on the flywheel. Question: Tell me, how does someone stop the crankshaft of the Friendship 2 chainsaw to loosen the clutch or flywheel nuts? Answer: On the clutch side, use a screwdriver in the disc hole and catch on some edge.

On the flywheel side, I secured it with my original flat key from a spare parts kit, on the air duct side, it locks it very well in one of the positions, you just need to make sure that the key is at the very base of the flywheel blades.

Then I tightened the nut not too tightly with the original puller under it and hit it through the rod into the end of the shaft with a hammer. Question: How to properly adjust the tension of the saw chain on the Druzhba 4 saw? Answer: This adjustment is made after installing a new saw chain on the bar, as well as during operation with a chainsaw, since the saw chain (especially a new one) stretches during operation and its tension weakens.

Adjust the chain tension in the following sequence: Loosen the fastening of the tire to the gearbox by unscrewing the nut.

By rotating the tensioner screw, tighten the saw chain so that when the lower branch of the chain is pulled away from the bar in its middle part, the edge of the connecting link of the chain is at a distance of 5-10 mm from the edge of the bar. The tensioned chain should move along the bar by hand. A new saw chain on a new bar that has not been broken in may not move by hand. This is not a defect.

After a short run-in of the sawing apparatus at medium speed (3-5 minutes), the mobility of the saw chain on the bar will be restored. Tighten the tensioner nut. Question: Tell me, what are the parameters of the crankshaft nut on the clutch side of the chainsaw? Answer: M14x1 height 4mm. the same nut secures the chain drive sprocket. Question: Tell me about the contact chainsaw Friendship 4 Electron.

The problem is this: it starts the first or second time, it idles normally, the power seems to be normal, but you start sawing, and as soon as you turn the saw away from you, it stalls, it’s exhausted, maybe someone knows the reason? Answer: what if the saw is running without load and “turned up” will it also stall? According to the theory, the engine stalls if there is nothing to burn or ignite.

Moreover, usually, when the ignition system fails, the engine stalls “sharply,” and when the power system fails, it convulses, but does not stall immediately.

So you need to inspect the ignition and power system. Ignition is easier - check the spark in the “wrapped” position of the saw. Question: I have been using the Druzhba 2 saw since 1974.

It broke down a lot in different ways, but now the problem is the following - I put in a new spark plug, it starts fine, but as soon as I burn 2 tanks of gasoline (I make the mixture 20/1) and the spark disappears, the spark plug is all wet with carbon deposits, I heat the spark plug - it starts, but it works not for long. the situation repeats itself, I put in a new one again, again 2-3 tanks and that’s it.

Moreover, whenever I unscrew the spark plug it is always wet, tell me what is the reason and how to fix it? Answer: Reduce the gap in the spark plug to 0.5 mm, if the ignition is contact - clean and adjust the breaker.

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.

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.

Homemade products from “Friendship-4”

The layout of the engine with a gearbox in this saw is so successful, and the clutch is so compact that the device is an almost ready-made power unit for many interesting homemade products. In 1973, on the basis of these engines, the MAI X-3 ultra-light helicopter was created, followed by modifications 4 and 5. They were even shown at a number of exhibitions, but did not go into mass production. It was too difficult to coordinate the operation of as many as 8 engines for 2 propellers that ensured its movement.

But he flew! But driving the engine from Druzhba is much easier. On snow and on hard roads.

True, fairly high speeds on the output gearbox of the saw require the installation of a large driven gear on the traction wheel, an intermediate reduction shaft, or a reduction in the diameter of the wheel itself. But snowplows and motor cultivators from it turn out to be quite productive, but also with a system that reduces speed.

Finally, it is worth remembering that the saw is equipped with a system with a hydraulic wedge.

This device is a great help when felling trees. How it works will become clear after watching the video: We recommend other articles on the topic

Choosing a chainsaw for your purposes, which brand should you choose?

Homemade drilling machine, design options, choice of materials, drawings

How to choose a circular saw - a circular saw for wood for home and country use

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Author: A. KARPOV, p. Imiskoye, Krasnoyarsk Territory

The Friendship 4 chainsaw starts and stalls: causes and solutions

A chainsaw is a relatively simple device, which is used from time to time by summer residents, installers, builders and rescuers. Construction stores offer a lot of models of chainsaws, which vary in power and quality of work. However, this practical and unique technique can also fail.

If such a problem occurs, it is very important to find the cause of the malfunction and eliminate it as quickly as possible. To do this, it is not necessary to contact services where the equipment will be put in order for a fee. Sometimes the breakdown can be so minor that it is not difficult to deal with it yourself.

Remaking the ignition of the Druzhba chainsaw

Since the engines on the Druzhba 4A and Druzhba 4A Electron chainsaw models are absolutely identical, the interchangeability of contact and electronic ignition systems on all models is quite possible.

Moreover, it is sometimes possible to remake a failed coil of an old contact ignition and install it instead of a failed electronic version.

Reworking the contact ignition coil

The coil is removed and all the high-voltage secondary winding made of the thinnest wire that has become unusable is removed. The primary winding, consisting of several turns of powerful wire, almost never fails. She is left in place.

The main thing is not to damage the insulating layers of varnish during dismantling.

Instead of the removed winding, they use an external high-voltage coil (bobbin) from a motorcycle, a two-speed moped of the Soviet period, or a car. The coil is attached in any way in a convenient place. Restore the connection diagram to the same as it was with a stationary winding:

• from the primary winding of the coil to the + (plus) contact on the bobbin;
• from the contact - (minus) on the bobbin to ground (engine housing).

The disadvantage of this option is that an additional part will appear on the body of the Druzhba chainsaw.

The advantage is that high-voltage coils are easy to change and are available.

You can also find descriptions online of how to repair the electronic ignition system of Friendship, which is reasonably considered to be practically unrepairable. This option is also possible, but for this you need to be an experienced specialist in the field of electronics and electrical engineering.

The ignition device on the Druzhba chainsaw is described in the following video, which also provides recommendations for adjustment:

For residents of the USSR, Druzhba was the only chainsaw, always in short supply, but relatively affordable. (Ural was created on the basis of Druzhba as a more powerful option for the timber industry). Hundreds of thousands of Friendships have been issued over decades. Many of them, due to their good maintainability, are still in working order. And spare parts, including two types of ignition systems, can still be found at flea markets and even online at sites like Avito.

How does the tool factory work?

The chainsaw is equipped with a carburetor two-stroke engine , which is practically its main element. Its power depends on the model of the equipment and its intended purpose.

The chainsaw saw set includes:

The larger the pitch the headset has, the more powerful and productive it will be, which means the deeper the cut will be . Therefore, the engine should not be inferior to it in terms of power, otherwise the operation of the tool will be inferior.

The chainsaw is lubricated with special oil directly from the second tank located on the hand block. Its mass has such features that the fuel and oil intended for the engine run out at the same time.

We have become familiar with the basic elements of the tool; now it will be easier to understand the reasons why a chainsaw may stop working and how to eliminate them.

Causes of malfunctions and ways to eliminate them

Almost every chainsaw owner has at least once encountered the fact that the tool either does not start at all when you press the gas, or starts and stalls after a while. There can be many reasons for a device to malfunction. Some of them are quite simple and easy to fix . Therefore, it is worth studying the main reasons so that in the event of a basic breakdown, you do not take the tool to a chainsaw repair service.

Why does a chainsaw start and immediately stall?

There may be several reasons for this:

1. There is not enough fuel in the gas tank. If the tool stops working immediately after the factory, then first of all you need to check the presence of fuel in the gas tank. If it is not enough, then you need to add the fuel mixture, which is prepared strictly according to the instructions included with the tool. Chainsaw fuel consists of gasoline with the highest possible octane number and oil, the brand of which must be specified in the technical passport of the tool.
2. Poor contact between spark plugs and high-voltage wire. The gap between the spark plug tip and the wire should be no more than 0.5 mm. If carbon deposits have formed on the candle, it must be cleaned and dried. Experts recommend periodically updating spark plugs, even if the old ones are still working properly.
3. Pouring a candle. A large amount of fuel collects between the spark plug electrodes, so if the spark plug is flooded, a spark will not form. To fix such a breakdown, just remove the spark plug and dry it. It would be useful to heat it using a gas burner.
4. Carburetor jet or fuel filter is dirty. It is quite easy to clean the gas filter yourself, but it is better to entrust cleaning the carburetor to specialists.

The chainsaw malfunctions at idle speed

The cause of this malfunction may be a dirty muffler .
Therefore, in order for the tool to work properly, sometimes you just need to clean the muffler of exhaust tar deposits. Quite often, the air filter in the tool becomes clogged, the air flow into the system becomes clogged, and this leads to the device stalling at idle.

Adjusting the Druzhba chainsaw carburetor

The main reasons for the need to urgently adjust the carburetor of Druzhba brand chainsaws include:

• interruptions in fuel supply;
• excessive volumes of fuel supplied by the carburetor;
• failures in the process of preparing a mixture of fuel and air - in these cases, the fuel system sucks in too much or not enough air.

Its repair instructions will tell you about the procedure for adjusting the carburetor of a Druzhba chainsaw. The operator’s action algorithm should be as follows:

1. On a saw with the engine turned off and cooled down, the screws responsible for the amount of fuel and air must be turned alternately until they stop. After this, each of the screws must be turned 2-3 full turns in the opposite direction;
2. After warming up the power unit, by ear or using a tachometer, you need to set the screw positions that will ensure the most stable operation of the engine;
3. As a result, the Druzhba chainsaw motor should operate quietly, without interruptions or jerks, and the chain should not rotate arbitrarily on the bar.

To reduce the frequency of carburetor adjustments, you need to fill the chainsaw with a properly prepared fuel mixture. The proportion of gasoline and oil for the Friendship chainsaw should be 1:20, that is, at least 50 ml of motor oil must be diluted in 1 liter of fuel.

Recommendations for the operation and maintenance of the Druzhba chainsaw

The Druzhba chainsaw is designed for felling forests and sawing logs. Thanks to its convenient design, the technical characteristics of even models from the 60s remain acceptable for many consumers.

To keep the saw in working condition, preventive maintenance of all components must be carried out regularly, and adjustments must be carried out at least once a year.

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.

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.

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.

What is good about Friendship-4 and its main disadvantages

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.

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.

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.

When the Druzhba 4 chainsaw engine starts and stalls, the reasons may be as follows:

1. There is not enough fuel in the gas tank. It is necessary to add the mixture according to the instructions supplied with the instrument.
2. The spark plug was splashed with fuel. This prevents a spark from forming. The candle must be removed, dried, and heated on a gas burner.
3. Poor contact between spark plugs and wire. This occurs due to the increased gap (more than 0.5 mm) between the tip of the spark plug and the wire. The spark plugs must be cleaned of carbon deposits with a wire brush and blown with air. They need to be changed periodically.

If engine malfunctions occur at idle, repairing the Druzhba 4 chainsaw comes down to the following:

• replacing the fuel mixture with reducing the amount of oil;
• cleaning the air filter and muffler (due to its clogging, the engine runs but does not develop speed);
• checking the fuel line and replacing the tube if necessary.

If the cutting speed has decreased and the tire is “driving”, pay attention to the sharpness of the saw teeth. A well-sharpened chain is more important than a strong engine. It is best to take it to a master for sharpening or use a machine with a rotary sharpening disk. The bevel of the Friendship saw blade on the bottom edge is 45°, and on the side edge - 60°. The height of the limiting protrusions relative to the chain teeth should be the same and checked after 3-4 sharpenings of the chain.

It is recommended to place the chain in liquid lubricant for some time, preferably heated.

The reasons why the Friendship saw does not start may be the following:

1. The fuel mixture does not comply with the repair and operating instructions for the model.
2. Manufacturing defects. Repairs are carried out in a warranty workshop.

When assembling, even if the parts fit tightly, you should not use force, for example, hitting them with a hammer. By replacing worn elements, you can restore the functionality of the chainsaw or extend its life.

Specifications and description

At this point, you can familiarize yourself with each model separately, and determine for yourself which one is most suitable for you. So let's get started.

Power of the saw "Friendship - 2"

This model is equipped with an engine that runs on gasoline and a two-stroke engine. It has a fairly high power, which is about 2.2 kW, due to which the rotational speed reaches 8700 rpm (which is two times less than that of the Ural chainsaw). It is this feature that allows high-level performance to be produced in a fairly short time range.

Moreover, it is a new product that has the highest quality and excellent assembly. The model itself has a fairly presentable appearance, as it is made according to the latest modern developments of the manufacturer. In addition, its owner will be able to enjoy specially designed features that have not previously been used in other models. This advantage contributes to the high balancing of the chainsaw.

Chainsaw friendship 2

If we talk about external developments, then we can say with full confidence that it is very convenient to use, thanks to the handle with an excellent grip built into its design. The functionality of the saw is designed in such a way that you cannot get burned by a running hot engine, which is the case with most other chainsaws from other manufacturers, since it cools itself during operation.

The body is made of high-quality material, which is not affected by increases in air temperature, and also does not change its characteristics over many years, so the chainsaw of this model will look great for decades. Moreover, absolutely all internal spare parts and parts are securely hidden inside the tool, thereby protecting them from corrosion and external influences.

It is also important that this model is equipped with a mechanical chain brake, the main purpose of which is to protect you from accidental chain drop. Since he is able to stop the operation of equipment in seconds. Thus protecting you from accidents.

The Friendship 2 m chainsaw is perfect for working on your summer cottage, as with its help you can easily cope with sawing and harvesting firewood, dry branches and twigs on trees, as well as small-diameter trees.

It is also worth noting that it is equipped with rubber shock absorbers, thanks to which vibration feedback and various vibrations are minimized. This model is a real find for summer residents, farmers, people engaged in professional activities related to working with a saw.

Chainsaw “Friendship – 4” – instruction manual

This model is designed for high-quality and high-speed cutting of wooden materials. This type of chainsaw has an improved and latest modern design.

Moreover, it is quite powerful and at the same time its weight is relatively low. The model also has a quick and easy start system, a quick chain stop system and vibration damping system. Also included are goggles and gloves for your safety.

Chainsaw Friendship 4

The chainsaw has excellent weight distribution, making working with it a real pleasure, as it is efficient and convenient. Thanks to the instant chain stop feature, the tool will not accidentally injure you or people around you.

The model also has a kind of drive coming from the engine (gasoline) with a manual start-up system. And thanks to the anti-vibration feature, you can work comfortably with the saw.