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The first model of the chainsaw Friendship was developed in 1953, and was released in 1955. They were produced at machine-building plants in the cities of Biysk and Perm. All models of these chainsaws have a two-stroke single-cylinder engine with air cooling and carburetor. Thanks to its convenient design and high performance, Friendship is still in demand, and the first models are in working order. The main purpose of the chain saw is Friendship - cutting trees and sawing logs.
Before operating any chainsaw, be sure to read the instructions from the manufacturer and comply with all safety regulations.
The overall design of the saw did not change significantly over time, only the individual parts were refined. The figure at the end of the model name indicates its power, for example, Druzhba 2 - 2 hp. In the first released chainsaw, the pens were attached to the fan cover, later they were attached to the clamp that connected the reducer and engine. In the model 4A, produced before the 80's, the contact magneto and the carburetor KMP-100 were already used. Also for the first time automatic chain lubrication was applied. Later it was withdrawn from production and instead of it began to produce a model 4A-Electron with electronic ignition.
In the 90's was replaced by the former carburetor for the new KMP-100U. The chain saw was called Druzhba-4M and was equipped with renewed chains. Based on the Druzhba chain saw, a saw "Ural" with more powerful characteristics was developed. The latest model with a similar design is Druzhba 5E.
Additional marking with the letter E or the word "Electron" means that the electronic chain ignition system is used in the chainsaw.
This model has become one of the most popular of the entire original series. The Druzhba-2 chainsaw works at the expense of a two-stroke single-cylinder engine with a power of about, kW with a rotation speed of 3200 rpm. Compared with the previous version, this was performed more qualitatively. The frame and handle are made in such a way that the user can not burn himself on the hot engine. The body is made of high quality alloy, which is not afraid of temperature changes. Unlike the first model, this one already has a chain mechanical brake for safe use. In the event of a rebound or a break, he will stop the chain. The saw was intended for domestic needs as well as for professional felling of the forest. Weight 1, kg.
In the chainsaw friendship 4 uses the same engine as the previous model, but more power - 4 hp. or, 4 kW. The engine and power unit are installed by means of a flange connection fixed with a clamp. The engine can be easily removed in any conditions if necessary (repair, replacement). Based on the Druzhba 4 saw, two modifications were made with markings 4A and 4E. In the first, a system of automatic lubrication of the saw chain was added, and in the second, electronic ignition was used. Also, the defects of previous models were taken into account, for example, the crankshaft bearing was strengthened. All versions were produced with an emergency braking system.
In the chainsaw, the friendship 4M-Electron uses a similar engine with a power of 4 kW and a speed of 5200 rpm. The cylinder is made of aluminum alloy, and is internally treated with chromium to improve wear resistance. Unlike earlier versions, this saw has a rotary reducer, which allows you to turn the saw unit to 60-90 ° for more convenient operation. The weight is distributed evenly throughout the body so that the work is as comfortable as possible. There is also a vibration damper located between the handlebars, arms and a gas tank.
To reduce the noise level, the saw is equipped with a silencer, and the noise level is 106 dB. The 4M-Electron gasoline chain saw has a carburetor KMP-100U or KMP-100-AP installed. There are systems of automatic braking and lubrication of the saw chain. Weight 1, kg.
The latest released version of this series chainsaw. Equipped with a two-stroke single-cylinder engine with a power of 5 hp. or, kW. Due to this, its performance is noticeably higher than that of previous models. Rotational speed 6200 rpm. At the same time, the level of the published noise is slightly lower than that of the Druzhba-4M Electron, and is 105 dB. Weight of chainsaw 5E is less by 800 gr - 1, kg.
Table with technical characteristics of chainsaws Friendship:
|engine's type||Single cylinder, two-stroke, petrol|
|power, kWt||,||, 4||,|
|Rotational speed, rpm||3200||5200||6200|
|Length of tire, cm||45|
|Automatic chain lubrication||-||+||+|
|Fuel tank capacity, l||,|
|Lube tank capacity, ml||240|
|Weight without consumables, kg||1,||1,||1,|
|Dimensions, cm (WxHxD)||46х50х8,||46х46х88|
|Rotary reduction gear||-||+||+|
|Chain pitch, in.||, 04|
|Lubrication of the engine||Petrol mixed with oil|
Advantages and disadvantages
Positive qualities of benzopil brand Friendship:
- high productivity and the possibility of long operating time without interruptions for 50 minutes;
- simple construction;
- the presence of high handles, thanks to which it is possible to saw in a standing position, they also provide a safer use and reduce the level of vibration;
- accessible location of all parts;
- The chain is driven by high engine speed, it is stationary at idle;
- low-octane fuel can be used;
- the presence of an emergency brake in most models;
- When the saw chain is jammed, the saw does not stall;
- accurate and even cut;
- The service life in compliance with the rules of operation and proper care can be from 15 to 30 years.
The main disadvantage - a lot of weight. Also, due to the fact that the starter is removable, it is often lost, and there is no Stop button.
Do not use leaded petrol as a fuel and run the saw in a confined space.
Thanks to a simple design, the repair of the Friendship Chainsaw can be done with your own hands. For example, in saws of this brand often there are problems with ignition, especially if a contact is installed. It is extremely sensitive to various oils and gasoline. Therefore, it is better to purchase an electronic ignition instead. Especially since the spare parts of the contact for the chainsaw of friendship are not cheap and unchangeable.
If the candles are heavily poured, then you should pay attention to the carburetor. In this case, it is necessary to slightly bend the inside of the gasoline valve, as a result, the quantity of fuel supplied will decrease and the candles will not get wet.
Also easily regulated carburetor:
- The fuel screw is screwed to the end and unscrewed back to 3 turns.
- The air screw is completely closed and turns 2 turns.
In order not to suck air into the system from the outside, all seals must be sealed.
Compared with other models of chainsaw Friendship sold for a lower price, due to a small amount functions, but has an excellent quality and long service life, which can not boast of imported model.