Chainsaws "Friendship": technical specification, model overview, instruction manual

The Perm Machine-Building Plant developed the technical characteristics of the Druzhba chainsaw back in the 1950s. Since then, this tool has been a leader in its segment for both professionals and amateurs for decades. The main advantages of the unit include high performance along with ease of maintenance. The universal design made it possible to use the device not only for its intended purpose, but also as the basis for various "homemade products". However, first things first.

Technical characteristics of the Friendship chainsaw

Below are the parameters of the most popular modifications of the tool in question.

First production model

The Druzhba-2 gasoline saw appeared on the market in 1955 and immediately gained immense popularity among forestry workers and gardeners. At that time, the unit had quite impressive capabilities, including ease of repair and maintenance, as well as high performance. As a power unit, a two-stroke single-cylinder engine with a capacity of about three horsepower was used. From a security point of view, when compared with modern counterparts, Druzhba-2 left much to be desired.

Despite the advantages, the tool had a number of significant drawbacks. Firstly, the unit was not equipped with a “engine” stop button and an instant stop system; the engine was shut off manually by blocking fuel access. Secondly, the first samples did not have the function of automatic chain lubrication, which reduced labor productivity during prolonged use and contributed to intensive wear of the working edge. In addition, the mass of the instrument in more than 12 kilograms, also did not cause much admiration.

Friendship-4

This advanced modification is also morally long obsolete, but it still works in some farms. From its predecessor, the Quartet has a number of improvements. Among them:

1. A chain lubrication system has appeared.
2. The power of the unit increased to four liters. from.
3. The cylinder and piston group are made of reinforced aluminum alloy, which positively affected the duration of their service life.
4. Turnover increased to 5400 rotations per minute.

These innovations allowed to increase the productivity of the device, which was able to process up to 0.75 square meters of wood per second. Friendship-4 was equipped with a forced atmospheric engine cooling function. A spark on the candle arose with the help of a special cable and magneto. Fuel from the tank was fed by gravity, the working mixture was gasoline and oil in a ratio of 15/1. The noise of the tool was reduced due to the installation in the design of an updated muffler.

Modifications "4 Electron" and "5-E"

Another advanced tool of this series was equipped with electronic ignition. The "4 Electron" model had a capacity of three horsepower, consumed about 720 grams of fuel (kW / h), the distance between the electrodes of the candle was 0.6-0.7 mm.

The next update came out under the 5-E index. The technical characteristics of the Druzhba chainsaw of this series have significantly improved in terms of increasing power (5 hp) and productivity. At the same time, the mass of the unit decreased by 0.8 kg. Noise has also decreased due to the improvement of the muffler. In the 90s, the popularity of the tool decreased significantly due to deterioration in the quality of the materials used and assembly.

Running in

Refuel the unit in question with special oil for two-stroke engines, mixed, in the above proportion, with AI-92 gasoline. The tool is run in two stages. Even the best chainsaws of this line should develop at least four fuel tanks at idle. At the second stage, they begin to work without overloading the unit. Recommended period is 24 hours. After that, they remove a special factory retainer ring located between the carburetor cap and the throttle, and begin to fully use the selected model.

Exploitation

Work with the specified tool refers to the conditions of increased danger. Therefore, it is first necessary to carefully study the instruction manual for the Druzhba chainsaw. This will allow you to determine the principle of work, features, safety rules. Caution should be exercised during the work, it is necessary to think over the places of the fall of branches and trees in order to avoid injury. When cutting material, it is necessary to guide the blade from the base to the top. It is not necessary to give the maximum load to the motor immediately, let it warm up for a couple of minutes.

If any malfunctions in the form of cracks, abnormal vibration, smoke are found before starting work or during operation, it is necessary to shut off the unit and not use it until troubleshooting. The operator must wear PPE (boots, mask, jumpsuit).

Chain setting

The instructions of the Friendship chainsaw indicate the installation and tension of the chain, as well as the rules for caring for this element. Stages of work:

1. The chain "sit" on the bus.
2. The complete assembly is mounted on the gearbox.
3. The fixing bolts are screwed up to the stop, after which they are slightly loosened.
4. At this point, chain slack should not exceed 10 millimeters.
5. Re-clamp the mounting bolts.

The tool in question is equipped with an automatic lubrication system for the cutting part. After pouring oil into the tank, you should check the uniformity of its supply at idle.

It is important to be able to correctly replace the asterisk. The following steps are provided for this:

1. Removing the headset, unscrewing the latches of the tire cover, its dismantling along with the chain.
2. Removing the air filter.
3. Unscrewing the candles, installing instead of it a locking element for fixing the piston.
4. Dismantling the clutch using a puller.
5. Sprocket replacement and assembly of the assembly in a mirror sequence.

Carb adjustment

After a certain period of operation, certain malfunctions may occur in the operation of the saw: it starts up and stalls, consumes a large amount of fuel, and does not start. These problems are associated with improper adjustment of the carburetor of the Friendship chainsaw. Correcting this node yourself is not difficult.

First you need to make sure that the candles are not filled with fuel composition, then check the gas valve by bending it slightly inwards. If the problem persists, adjust the carburetor. The process consists of the following steps:

1. Screw the fuel screw all the way.
2. Unscrew it three turns.
3. The air analog is twisted until it stops, then released for a couple of turns.
4. All seals are checked for leaks.

Tool maintenance

Even the best chainsaws require regular maintenance. Daily maintenance is performed before and after work. This includes checking the operability of the tool, cleaning from contamination. Scheduled inspections are carried out in case of failures, minor breakdowns, blunting of the chain, the need to adjust the carburetor and the like.

For long-term storage, the unit must be cleaned of impurities, dried, lubricated, and packed and stored in a dry place. Depreservation of the instrument is as follows:

1. The external parts of the housing should be thoroughly cleaned from factory lubrication, with particular attention to the starter.
2. Unscrew the spark plug, wash it in gasoline, wipe it with a clean rag or napkin, put it in place.
3. Wipe the ignition wire with a clean, soft material.

Pros and cons

The technical characteristic of the Friendship chainsaw gives it a number of advantages over analogues. Among them:

• simplicity of design;
• reinforced metal housing;
• the presence of a mechanical brake for the chain stopper upon impact or break;
• convenient placement of the main nodes;
• high speed chain movement;
• unpretentious motor;
• design feature of the frame, compensating for vibrational moments;
• Long life with proper maintenance.

The disadvantages of the unit are also many:

• a removable starter often falls out, which causes loss of working time;
• a significant mass of the tool, limiting the circle of users;
• the Stop button is not provided; the engine must be turned off at each break;
• poor sealing of the gas tank, which does not adequately protect the unit from moisture;
• lack of sale of original spare parts for the Druzhba chainsaw, due to the long-standing termination of serial production.

Most common problems

Below are the malfunctions most often encountered during the operation of the specified tool:

1. The motor does not start. It is necessary to check the spark on the spark plugs, the insulation of the wires. If necessary, change the damaged areas or clean the candle.
2. Intermittent operation of the engine, the Friendship chainsaw turns on and immediately stalls. It is necessary to check the tightness of the gas tank, because interruptions are often caused by the ingress of liquid into the fuel.
3. Motor overheating. Carburetor adjustment required.
4. A similar problem with the gearbox. This is usually due to a lack of lubrication. Add the appropriate composition and re-test the tool.
5. Sparks appear on the exhaust, amplified noise during operation. You should check the integrity of the muffler, it can easily be repaired by yourself.
6. The spark disappeared. The reason may lie in the malfunction of the ignition module, violation of the control distance between it and the magnetic circuit. The required value (0.2-0.5 mm) is set using a special gasket located between the module and the flywheel.

What can be done on the basis of a chainsaw?

Thanks to the design features of the unit, craftsmen on the basis of the tool in question are building all kinds of homemade products. Among them:

1. Mopeds To equip you will need an old bike, on the frame of which you need to mount the engine from a chainsaw. On mountain models, you will additionally need the purchase of a gearbox and gear transmission.
2. Motor boats. Here is taken the motor and gearbox of the Friendship chainsaw. The design is complemented by blades with a diameter of 210 millimeters. It should be noted the efficiency of this mechanism. At a speed of about 20 km / h, approximately one liter of fuel will be consumed.
3. Snowmobiles. This is a fairly common "homemade", and the configuration of the finished machine depends on the user's imagination.

In addition to these versions, on the basis of "Friendship" they make motor blocks, cultivators, lawn mowers. Home-made devices work no worse than factory analogues, while it is much cheaper.

When creating or upgrading any type of equipment, it is necessary to be guided by safety rules. Ignoring this point leads to injuries and other unpleasant consequences. Experts do not advise making grinders on their own, they proved themselves extremely unreliable and dangerous during operation.

User reviews

Despite the fact that the Druzhba chainsaw has not been mass-produced for a long time, some people continue to use resuscitated versions, they are quite happy with them. The owners are pleased with the reliability of the frame, ease of repair, the performance of domestic tools, as well as the unpretentiousness of fuel quality. Among the minuses, consumers note classic problems: heavy weight, poor operator protection, carburetor outages, lack of original spare parts.