Chainsaw Druzhba - characteristics, do-it-yourself repairs, homemade options

Chainsaws of the famous Soviet brand Druzhba were created and used in the past, but even today they are actively used to solve the most complex problems in local areas and in the logging industry. The models from this manufacturer managed to maintain high performance and efficiency when working with any type of wood. Despite the rather complex basic design and atypical layout of controls, Druzhba brand petrol tools are as easy as possible to maintain and repair. This allows even beginners and inexperienced gardeners to use them confidently.

Possible problems

The main problem that arises during repairs is the lack of necessary information on repairs.
This is explained by the fact that many foreign manufacturers believe that the saw should be disposed of after a certain period of use. Therefore, many craftsmen have certain doubts, especially when repairing budget models. But expensive professional models also create certain difficulties:

1. The first problem is supplying expensive spare parts.
2. For maintenance and repair of some components, special equipment is useful.

Of course, it is possible to replace original spare parts with Chinese analogues, but judging by the reviews, this method is of little justification. Such components produce only half the resource.

Operating instructions for the “Druzhba” petrol saw

This document contains the following information:

1. Device, assembly diagram of the Druzhba chain saw.
2. Technical characteristics of a gas-powered saw.
3. Safety precautions when operating and servicing a chain saw.
4. Preparing for launch.
5. Run-in.
6. Maintenance of the Druzhba chain saw.
7. Malfunctions of the Druzhba chainsaw.

Let's briefly go through the sections:

Chainsaw safety

• do not operate the saw with the air filter removed;
• hold the instrument with both hands;
• use special clothing and protective equipment;
• do not adjust the carburetor if you lack the skills;
• use only high-quality mixture;
• do not work with an empty oil tank;
• do not operate the saw if it is faulty;
• ensure the absence of strangers in the workplace;
• take 10-minute breaks every 45 minutes of work;
• do not use pure gasoline, only when mixing gasoline and oil;
• When replacing the headset, turn off the saw motor.

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.

What can be made from an old Druzhba chainsaw

It’s safe to say that the popularity of Druzhba chainsaws is a thing of the past - there are too many more advanced analogues on the market. However, you should not write off the once in demand chain saw and sell it for scrap. There are a lot of homemade “Friendship” chainsaws. Let's follow the improvements and alterations and find out what kind of life an outdated tool can get:

• Snowmobile from a Druzhba chainsaw (we immediately offer drawings of this unit, which will help you build a snowmobile with your own hands);

1– steering wheel; 2 – fuel tank (from the Druzhba chainsaw; 3 – power unit (from the Ural chainsaw); 4 – steering ski stand bushing (pipe with a diameter of 30-2 pcs.); 5 – steering ski (2 pcs.); 6 – caterpillar drive gear (nylon, sheet s15, 2 pcs.); 7 – caterpillar (from the Buran snowmobile, shortened); 8 – frame; 9 – support roller (from potato sorting, 18 pcs.); 10 – strut backrest limiter (pipe ½); 11 – caterpillar tensioner (2 pcs.); 12 – caterpillar tension gear (nylon, sheet s15, 2 pcs.); 13 – bearing No. 80204 in the housing (4 pcs.); 14 – trunk box, bottom plywood s4, sides board s20); 15 – seat (cover-plywood s4, foam rubber, leatherette); 16 – 1st stage of chain transmission; 17 – 2nd stage of chain transmission; 18 – seat backrest limiter (½ inch pipe); 19 – driven sprocket of the 1st chain drive (large sprocket of the creeper, intermediate shaft); z=38; 20 – drive sprocket of the 2nd stage of the chain drive (small creeper sprocket), z10; 21 – driven sprocket of the 2nd degree of chain transmission (drive sprocket of the track drive shaft), z18; 22 – drive sprocket of the 1st stage of the chain drive (gearbox output shaft sprocket), z12; 23 – steering knuckle lever; 24 – steering rod (2 pcs.); 25 – steering shaft with bipod; 26 – front axle beam (pipe with a diameter of 30); 27 – caterpillar drive shaft; 28 – tension axis of the caterpillar.

• Moped from chainsaw “Friendship 4”:

• Motorcycle from a chain saw “Friendship”.
• A bicycle with an engine from a Druzhba chainsaw.
• A walk-behind tractor with an engine from a Druzhba chainsaw. Below are drawings of such a walk-behind tractor:

1 — gas handle 2 — gear shift lever, 3 — clutch lever, 4 — control handle, 5 — frame, 6 — bracket for the rear linkage of working tools, 7 — lugs. 8 - wheel, 9 - intermediate unit, 10 - tank, 11 - engine. 12 — fan casing, 13 — cylinder deflector, 14 — gauge wheel, 15 — gauge wheel fork, 16 — adjusting rod, 17 — cultivator foot.

You can also make attachments yourself by converting the walk-behind tractor into:

• hiller;
• mower;
• snow removal attachment;
• potato digger;
• planters, etc.

You can also make independent devices from the “Friendship” saw:

Boat motor from the Druzhba chainsaw - what it looks like is shown in the video:

Making all these homemade products from the Druzhba chainsaw with your own hands is not so difficult, just search the Internet for videos, descriptions, instructions with drawings. The Internet is teeming with all this - take it and do it!

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.

Simple homemade projects - even a beginner can do it

Among the most simple in design equipment based on a chainsaw, one can highlight a fairly large list of equipment. This includes:

• Grinder – its base includes a bearing assembly and a shaft. At one end of the device you need to attach a driven pulley, rotating using a V-belt. On the other side, a mandrel for cutting elements is attached. Such a tool can be used for cutting metal, brick, stone and other building materials;
• Boat motor - to make the device, a chainsaw motor and a gearbox with a gear ratio of 2 to 1 are attached to the boat. The design will also need to be supplemented with a propeller with blades with a diameter of 21 cm.
• If the engine consumes 1 liter of fuel per hour of operation, the boat will move at a speed of 20 km/h;
• Winch from a Druzhba chainsaw - a tool drive is used to make it. The traction force of the winch can be increased by using an additional unit with a separate drive.
• The finished device can be equipped with hooks, anchors and straps.

The simple design and manufacturing principle allows even a beginner to make the necessary household equipment.

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.

What kind of oil should be poured into a domestic chainsaw?

We found a domestic Ural chainsaw in the garage.
My husband took it apart, cleaned it, says it’s like new and should work. What kind of oil to pour into the Urals to try to turn it on. What kind of gasoline will this chainsaw work optimally on? The Ural chainsaw is considered a descendant of the Druzhba chainsaw - a reliable and worthy unit. If adjusted well and used regularly, such a saw almost always shows stable operation.

As for gasoline, previously AI-76 grade was poured into such a chainsaw, but now A-80 can be poured. As for oil, you can use domestic M8-B or any other imported oil for a two-stroke engine. Oil should be added to gasoline in a ratio of 1:25.

First of all, read the operating instructions for your domestic chainsaw.

What kind of oil and in what proportions, a whole chapter of instructions is devoted to this topic.

You write about the Ural chainsaw; the best option would be Avtol (this is M-8B motor oil).

If you mean oil for preparing a fuel mixture for a chainsaw, then the proportions are 1:20 (oil to gasoline).

The same oil can also be poured into the chainsaw gearbox.

Since the Ural chainsaw is a descendant of the Soviet Druzhba chainsaw, and Avtol (M8-B oil) was popular during the Soviet Union (recommended for use in GAZ, ZIL, etc. cars, including Ural ), then it is considered the best option for such a chainsaw, plus, the price is completely affordable.

When purchasing oil, pay attention to the labeling; GOST must be indicated there.

GOST for this oil is GOST 10541-78.

M-12TPU, MGD-14M, etc. oils are also suitable, these are all domestic oils, you can also use imported ones, but domestic ones are better.

Source

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 specialist 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.

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.

Gas trimmer carburetor repair tips

1. Regardless of the manufacturer, there are manufacturing defects in parts of the gasoline braid carburetor.

Coil Spring Adjustment

For example, the adjustment method described above may not give positive results if there is an excessive number of turns on the spring of the mixture supply auger and, as a result, it is impossible to optimally reduce the level of gasoline supplied. To fix this, you can shorten the spring yourself or buy a new one according to the instructions.

READ How to Thread Line into a Petrol Scutter

Many hedge trimmer owners, when purchasing oil, follow the recommendations for preparing the fuel mixture.

Gas trimmer oil

Yes, often the information on mixing gasoline and oil indicated on the can differs from the information in the trimmer's passport. As a result, black soot can quickly form on the spark plug, leading to a drop in power and increased fuel consumption. Therefore, when preparing the working mixture, follow the recommendations specified in the operating instructions. In most cases the ICE mileage ratio is 1:25. It is worth noting that many tool owners prefer to prepare fuel “by eye”, which will inevitably lead to rapid wear of the piston braid if the oil portion decreases and soot forms on the spark plug with an increase in the amount of lubricant.

Properly selected trimmer carburetor adjustment tips listed above will not only avoid engine overheating and increase fuel consumption, but will also significantly increase the service life of other parts and components of the tool

Pay attention to the operation of the brush cutter in all modes and promptly carry out regulated maintenance and repair of the tool

About safety precautions

Before starting to work with a chainsaw, it is necessary to carry out a number of measures aimed at the safe operation of the device:

• checking the tightness of the fuel system;
• checking the cylinder fastening;
• checking the carburetor is secure;
• checking the muffler is secured;
• checking the tightness of steel fasteners from the outside;
• lubrication of the driven tire sprocket by immersing it in oil for several minutes;
• lubricating the starter cable with lithol-24;
• cleaning the air filter mesh on the carburetor.

When working, you must remember to strictly and compulsorily adhere to the following safety rules:

It is prohibited to carry out work with one hand; work clothes must be durable and include gloves, work shoes, as well as a protective helmet and a special shield; Before refueling, the gas tank cap must be opened extremely carefully, which is due to the possible presence of gasoline vapors; work must be carried out on completely cleared sites, with reliable and strong support; you need to make sure that the chainsaw does not touch foreign objects during operation.

Do not refuel with the engine running. The saw should be transported after the protective cover has been placed on the bar.

Most common faults

1. The engine does not start. Check for a spark at the spark plug electrodes. Make sure there is no damage to the wire insulation, clean or replace the spark plug if necessary.
2. Make sure the fuel tank is tight; interruptions in engine operation are often caused by moisture and condensate getting into the fuel mixture.
3. Adjust the carburetor
4. The most common cause of overheating is a lack of lubrication. Correct the problem.
5. Check the serviceability of the muffler. Its design is quite simple; repairs are possible at home.
6. The reason may be a malfunction of the ignition module, as well as a violation of the gap between it and the magnetic circuit in the flywheel. Gap length – from 0.2 mm. up to 0.5 mm.. This value is set using a special gasket, which is located between the flywheel boss and the ignition module. The broken module is replaced. In addition, you can replace the spark plug.

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.

Modifications

During the entire production of the chainsaw, Friendship 4 has not undergone any major design changes. Let's see what minor changes have occurred in the design of the chainsaw:

1. 1950 - 1960 . The first structural modification concerned a change in the mounting option for the handles; they began to be attached to the fan cover, and subsequently the fastening was moved to the clamp that connected the engine and gearbox.
2. 1960 - 1980 . At this time, a modification of the chainsaw called Druzhba - 4A, which had two main advantages: a contact magneto and the well-known KMP-100 carburetor, entered the assembly line and was produced for 20 years. At the end of the 80s, the modification of the Druzhba -4A chainsaw was discontinued.
3. Late 1980s. Release of the Druzhba-4M Electron modification. Electronic ignition was used for the first time.

4. 1990s . Equipping the chainsaw with a modern (at that time) carburetor KMP-100U. Changes in the saw set - the use of modern type chains.

Many people are confused and say that a number of other changes were made to the Druzhba 4 chainsaw, such as a removable starter, a detachable crankcase and a removable cylinder, but they are deeply mistaken. All these changes were made on the Ural chainsaw, the basis of which was Druzhba.

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.

Why do you need a muffler?

This is a special device, thanks to which the noise from a running engine becomes an order of magnitude lower, but does not muffle it completely and this does not suit many people.

Of course, saws are now sold in which the muffler is capable of suppressing noise several times, but this immediately affects the operation of the saw.

Therefore, if you want to make the engine even quieter than what is provided by the factory, then you should try installing an additional muffler by making it yourself.

If you are smart, the same Ural saw can be made to work much quieter and this will not affect its performance in any way.

Repair and maintenance of Druzhba chainsaw

Reliable spare parts and durable mechanisms of the Druzhba chainsaw are not able to protect the tool from damage. Most often, the causes of tool malfunction are improper handling or simple wear and tear of the mechanisms.

To reduce the risk of premature breakdown of the chainsaw, you should use high-quality gasoline of at least AI-80 grade to refuel it, in which oil for 2-stroke engines should be diluted. The proportion of gasoline and oil should be 1:25, that is, 40 ml of motor oil should be diluted in 1 liter of fuel.

The oil used to lubricate the chain must also be of high quality. Under no circumstances should you pour waste material into the oil tank of your Druzhba chainsaw, otherwise this will lead to damage to the tool’s lubrication system. To prevent the chainsaw chain from subjecting to excessive friction, use only fresh oil from trusted manufacturers.

It should be noted that the use of a high-quality fuel mixture and lubricant does not guarantee the constant uninterrupted operation of the Druzhba chainsaw. However, even if you discover a malfunction, you should not get upset right away. Some breakdowns are quite easy to fix with your own hands. Below we list typical malfunctions of domestic tools and ways to eliminate them yourself.

Adjusting the Druzhba chainsaw carburetor

1. To find the highest engine speed in idle mode, you must slowly turn the screw marked “L” clockwise. Once you find the maximum RPM, turn the same screw back ¼ turn. If after this the chain on the bar continues to rotate, then turn the screw marked “T” counterclockwise until the saw element stops completely;
2. Turning the screw marked “H” will allow you to adjust the required power and speed. To do this, you need to connect a tachometer to the Druzhba chainsaw and by turning the “H” screw, find the optimal number of revolutions indicated in the instructions. Immediately after this, turn screw “H” ¼ turn counterclockwise;
3. Then you need to fine-tune the engine idle speed. To do this, screw “T” should be turned until the saw chain begins to rotate. Immediately after this, turn the screw “T” in the opposite direction until the chain stops completely.

Carburetor adjustment carried out according to the instructions will allow you to reduce the fuel consumption of your Druzhba chainsaw and protect its parts from excessive wear.

How to set the ignition on a Friendship chainsaw?

To properly repair a tool, you need to carefully study its operating instructions. As the repair instructions for the Druzhba chainsaw indicate, to install the ignition, you need to remove the cover to which the starter is attached and turn the magneto so that the marks on it and the adapter coincide. After this chainsaw, friendship will be much easier to make.

Ural chainsaw device

The Ural chainsaw consists of many different components and assembly units connected to each other in different ways. In order to independently find the cause of problems with the operation of the chainsaw, you need to know very well the structure of the Ural chainsaw. Therefore, in this article, I invite everyone interested to familiarize themselves with the structure and operating principle of this wonderful and necessary tool.

Chainsaw MP-5 "Ural-2T Electron" (Figure 1) consists of: engine 1, gearbox 12, frame, sawing apparatus consisting of saw bar 15, tensioner 13 and saw chain 16, removable starter 3 and has a power supply system and lubrication of the sawing apparatus. The chainsaw comes with an individual set of spare parts and tools. 3.1 Engine The engine consists of the following main assembly units (Figure 2): crankcase 1, crankshaft 2 with connecting rod, piston 15 with two compression rings 20, cylinder 14 and automatic centrifugal friction clutch and has systems: ignition, cylinder cooling and exhaust gas exhaust .

Figure 1 — View of the saw from the muffler side

1-Throttle control lever, 2-joint, 3-stand, 4-throttle cable, 5-fuel line, 6-fuel tank, 7-stop button, 8-muffler, 9-engine, 10-starter, 11- protective casing, 12-cylinder, 13-gearbox, 14-drive sprocket, 15-nut, 16-saw bar, 17-tensioner, 18-saw chain, 19-springs, 20-drive sprocket.

The engine cylinder is made of aluminum alloy. To increase wear resistance, its internal working surface is chrome-plated.

The tightness of the engine crank chamber is ensured by rubber seals 3 and 17, paronite gasket 23 and paper gasket 25 (Figure 2).

Figure 2. Longitudinal section of a gasoline-powered Ural saw engine:

1— crankcase; 2 - crankshaft; 3, 17 — seals; 4 - flywheel; 5 - impeller; 6 — crankcase cover; 7 - ratchet; 8 — “Stop” button; 9 — deflector; 10 — ignition wire; 11 — shielding cap; 12 - insulator; 13 — spark plug; 14 - cylinder; 15 - piston; 16 — friction clutch driver; 18 — spring; 19 — friction clutch load;

The friction clutch consists of two parts - driving and driven. The leading part of the coupling is installed on the shank of the engine crankshaft and consists of a driver-16, weights 19 in the form of ring sectors and spiral springs 18.

The driven part of the coupling (hub) is installed on the shank of the drive gear of the gearbox 8 (Figure 7). Lubrication of the crankshaft bearings and working surfaces of the crank group parts during engine operation is carried out by oil included in the fuel mixture. 3.1.1 Ignition system The ignition system includes: contactless magneto EM-1 10 (Figure 4), flywheel 4 (Figure 2), ignition wire, insulator with noise suppression device (Figure 5) and spark plugs.

Figure 3 – Cross section of the Ural chainsaw engine

1—carburetor casing; 2 — casing cover; 3 — carburetor KMP-10О У; 4—screw; 5—air filter; 7—muffler; 6—risk for fixing the magneto; 8 - round nut; 9—casing gasket; 10 — magneto EM-1; 11 - damper Non-contact magneto EM-1 The design of the magneto EM-1 is shown in Figure 4. The electrical circuit diagram of the magneto EM-1 is given in this article. All semiconductor elements: five diodes, a thyristor, a resistor and a capacitor are mounted in the base chamber and filled with a sealing compound. If one of the elements in the base chamber fails, the magneto cannot be restored.

Figure-4. Contactless magneto EM-1

1— Risk of setting the ignition timing; 2—conductor to the ignition switch button; 3—capacitor; 4-oscillator coil; 5— risk of installing a magneto in the crankcase; 6 - control coil; 7—output to the secondary winding; 8-ignition coil (high-voltage transformer); 9-base.

The magneto ensures the start of spark formation at the spark plug at a flywheel speed of 400-600 rpm, therefore, checking the magneto for sparking should be done by rotating the engine crankshaft with the starter at a frequency not lower than the specified one. It is necessary to take into account that the temperature of the spark emitted by the EM-1 magneto is much higher than that from the contact magneto, and the spark is difficult to see in daylight. This is not a magneto defect.

Figure-5. Non-contact magneto mount EM-1

The EM-1 magneto operates normally at temperatures up to plus 85° C (temperature of the magneto housing). If the specified temperature value is exceeded when operating the chainsaw, the magneto electronic unit may fail. To avoid premature failure of the EM-1 magneto, you should follow the rules for operating the chainsaw. The magneto is installed in the crankcase on two studs and secured with nuts 8 (Figure 3).

A spark between the electrodes of the spark plug appears at the moment when the piston does not reach T.M.T. by 3.66 mm, which corresponds to the crankshaft rotation angle of 29° before T.M.T., which is the ignition timing angle. At the manufacturer's factory, when setting the ignition timing against mark 7 (Figure 4), mark 7 is placed on the magneto on the crankcase (Figure 4). When installing a magneto after replacing it, after routine or repair work during operation of the chainsaw, combine the indicated risks. Flywheel The flywheel is four-pole, installed on the crankshaft cone, fixed with a key and secured with a nut M 10 x 1. A ratchet 7 is attached to the thread in the flywheel hub (Figure 2) to start the starter motor. The high voltage wire is screwed at one end into the output pipe of the high-voltage transformer 5 (Figure 4), the other end has a threaded bushing for connection to the insulator (cap) 12 (Figure 2).

Figure-6. Ural chainsaw flywheel

The insulator is made of dielectric material - phenol plastic. Contact screw 4 is installed in the insulator on the thread (Figure 7). Suppression of radio interference arising during operation of the chainsaw is carried out by damping resistance 3 and shielding cap 6.

Figure-7. Noise suppression device

Advantages and disadvantages

Advantages of petrol saws of the Druzhba series:

• the use of aluminum alloy for the manufacture of the body;
• removable structural elements fixed with threaded connections;
• high power and increased engine torque;
• when the chain jams, the motor does not stop;
• the use of gasoline with an octane rating of less than 80 is allowed;
• the design of the handles allows you to saw wood while standing;
• high build quality (especially products of early modifications);
• chrome plating of the working surface of the cylinder is provided.

Equipment disadvantages:

1. there is no emergency stop button for the engine; when the speed drops, the shaft is disconnected from the chain gear by a centrifugal clutch;
2. the heavy weight of the saw, making it difficult to carry the product;
3. spontaneous loosening of threaded connections;
4. high noise level during operation and oil emission from the exhaust pipe;
5. the use of an internal combustion engine imposes restrictions on the use of the tool indoors.

Equipment with a more complex design - manufacturing principle

More experienced farmers who are perfectly familiar with the structure of a chainsaw can make more complex equipment. Such equipment includes:

• A tool sawmill is made using a metal frame. Next, the chainsaw itself is fixedly attached to it. The workpieces are directed towards the rails. Another manufacturing option is to use an adapter that is attached to the base of the tire.
• You should also use a guide that will correct the direction of movement of the installed adapter. The guide must be installed on a board fixed to a log for cutting. Such a device will help to saw a log into several parts, spending a minimum of effort;
• Moped - it is based on an old bicycle, to the frame of which a chainsaw motor is attached.
• The design of the moped also includes a gear drive. If you used a mountain bike as a basis, then to move on such a moped you will also need a gearbox;
• Do-it-yourself snowmobile from a Friendship chainsaw - every more or less experienced chainsaw owner can assemble this unit. This requires a transmission system of two gears, through which the motor power will be transmitted to the skis.
• For more stable operation of the equipment, you will need to adjust the carburetor. If for some reason the unit does not start immediately after assembly, then the reason for this should be sought in the spark plug. Most likely, it will need to be replaced with a higher quality part.

The domestic chainsaw and homemade products from it have helped dozens of craftsmen save money on the purchase of household equipment. It is the ability to use the tool when creating various equipment, its power and reliability, that have made the domestic chainsaw a truly universal working unit.

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.

Muffler chainsaw Ural

, in stock

Price (excluding delivery) *: prepaid:

Muffler chainsaw Ural Units of measurement: pieces

Muffler chainsaw Ural

You will receive it at the nearest post office, delivery by Russian Post.
pay for the Ural chainsaw muffler
by cash on delivery upon receipt.

*Price upon receipt - the cost of the goods when paid at the time of receipt: courier delivery, pickup, receipt by mail (included in cash on delivery). The price for advance payment is significantly lower, a discount is provided, on average 15% lower than the price upon receipt.

Attention! Product images and descriptions are provided for reference only and may differ from the actual product. Please check with the operator for any further details.

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.

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.

What oil can be used to lubricate the chain on a saw?

Very often when selling a chainsaw, the question is asked: “What kind of oil should I use to lubricate the chain?”

. The most common answer: “Anything except working out.” This is absolutely true, but there are some nuances... For example, sellers often offer to buy chain lubricating oils from chainsaw manufacturers or those designed specifically for these purposes. This usually makes sense at low temperatures or when you are paying close attention to protecting the environment.

In other cases, it is quite possible to replace the chain lubrication oil with any other oil other than working oil. However, there is one more nuance... Users often have a question: “Why is the oil consumption for chain lubrication greater than the fuel mixture? After all, their consumption is related to each other? Here it is worth considering that chainsaw manufacturers calculate the oil consumption for lubricating the chain when filling in their branded oil. And the consumption of any other may differ either less or more.

On many chainsaws, starting from semi-professional ones, it is possible to adjust the oil flow rate for chain lubrication. This is done by adjusting the performance of the oil pump.

If such adjustment is not provided, then the settings come initially from the manufacturer. How to check whether the oil consumption for lubricating the chain on your chainsaw is normal? It is necessary to start the saw, give it gas and bring it to a board, log or other surface that is horizontal. A running chain should scatter oil particles to lubricate the chain and leave a thin, even oil trail.

When to use special chain oil

The use of special oils for chain lubrication will be justified in the following cases:

• You have a new chainsaw under warranty and to preserve it you must use oils recommended by the chainsaw manufacturer. Otherwise, if, for example, the oil pump fails, the repair will not be carried out under warranty. This is especially true for expensive professional chainsaws.
• You respect the environment and prefer not to pollute it again. In this case, oils with the prefix “bio” are suitable.
• When working at critical temperatures.

Let's look at several types of oils from different manufacturers and sort them by price category, environmental friendliness and container volume.

Often the most optimal choice of oil for lubricating the chain and bar will be the simplest oil of the M-8 or M-10 brand. Its characteristics fully satisfy the necessary purposes.

At low temperatures it is necessary to pour oil with a low thickening point

, otherwise the oil supply pump may fail.

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