I use the Druzhba-4 Electron chainsaw, year of manufacture 1992. I work for 10-15 minutes and it stalls and does not start anymore, it will stand for a while and the same problem repeats. How to fix?
Your saw has contactless electronic ignition and a KMP100-ar carburetor. Most likely, the thyristor in the magneto burned out. Change it to import.
I operate a Druzhba 4 gasoline-powered saw. The chains are all native, which were completed during the sale. First they were sharpened by a local craftsman, but then he sharpened himself with a file. It seems that when sawing before, the cut was relatively even, as far as skill and eye were enough, so to speak. Now he barely sawed the willow. It just pulls the tire to the left and jams. To the touch, the point on the teeth is normal. How to sharpen a chain?
In a cut of the same width, 5 teeth are involved, each has 2 cutting edges with their own angles. I would recommend replacing the leading, driven sprockets + buying a new chain (Ural, Shtilev).
What is the sequence of actions when disassembling the Friendship 4 Electron chainsaw?
The chainsaw should be disassembled in the following sequence:
- loosen the nut, turn the bar on the stud with the driven sprocket up and remove the saw chain;
- unscrew the nut from the stud, remove the tensioner and saw bar;
- remove the fuel line from the fuel valve fitting;
- disconnect the carburetor throttle control cable from the lever;
- loosen the eccentric clamp of the frame clamp by turning the lever and unscrew the screw connecting the segments of the frame clamp, remove the frame and disconnect the gearbox from the engine.
Tell me, where is the wavy puck in friendship?
Disconnect the gearbox, remove the clutch, remove the cover with the stuffing box, and here it should be.
Can you advise a chain from imported saws that can be installed on a Druzhba saw?
Oregon 46RC Stihl 46 RM - 404" Windsor 64E 0.404 1.6 20" 63BC64.
Tell me, I installed the Druzhba 4 chainsaw engine with a new cylinder for the Ural carburetor, a new ring piston, set the ignition. Starts up fine now, keeps revs, does not stall. But the problem is, when you start to cut something, it lacks strength and immediately stalls. I don’t even know ... I twisted the carburetor bolts - the same thing. maybe someone knows how to fix the problem?
I can tell you only from my experience in repairing chainsaw engines: 1. there may be insufficient thermal clearance between the piston and the sleeve under load, the piston simply jams 2. the piston is incorrectly installed, piston pin offset mismatch, insufficient (excessive) thermal clearance of the rings, the ends of the compression rings are incorrectly spaced 3 .incorrectly set ignition.
How to disassemble the engine on a Druzhba 4 chainsaw with electronic ignition?
Disassembly of the motor should be done in the following sequence:
- KMP-100AR carburetor - remove the carburetor by partially unscrewing the carburetor fastening screw on the cylinder pipe;
- KMP-100U carburetor - remove the carburetor with a gas line, remove the casing with the carburetor gasket and the pipe gasket with a damper, if any;
- remove the silencer by unscrewing the nut and the nut securing the silencer to the crankcase;
- unscrew the insulator from the spark plug and unscrew the spark plug;
- dismantle the deflector by unscrewing two M5 nuts;
- remove the fan housing by unscrewing five M5 nuts;
- unscrew the ratchet and remove the adjusting rings under it.
- unscrew the flywheel fastening nut and remove the flywheel using a ratchet and an insert-puller;
- Unscrew the ignition wire from the insulator (cap) of the spark plug;
- unscrew the two screws and remove the magneto with the ignition wire, after
- remove the adapter;
- unlock and unscrew the nut, remove the friction clutch;
- unscrew the four nuts and remove the cylinder without damaging the gasket;
- remove the piston rings, for which you should use three brass, copper or tin plate plates that are installed under the ring: two in the lock area and one on the diametrically opposite side of the piston.
Tell me - when you pull the Druzhba 4M Electron chainsaw with a starter, the chain should not spin? I have to spin. I believe it's a clutch issue. Or am I thinking wrong? If correct, how to fix it?
When the engine is stopped, the chain should move freely along the tire - the gearbox and the motor are disconnected, the chain also stands at idle speed. If these conditions are met, then when scrolling with the armstarter, the chain will be motionless. Look at the stops of the rings - are they well riveted, replace the rings (on the clutch), they may have dropped.
I decided to repair and bring the Druzhba 4 saw into working condition. In principle, there were no difficulties during disassembly and culling, but certain questions arose about the condition of the piston sidewalls, there is a yellow-brown coating, almost along the entire circumference, except for the carburetor location area. Is this the normal working color of the piston or does it need to be changed?
Sealing is carried out, first of all, due to the rings. I think they need to focus on, and the piston, if, of course, it does not hang in the cylinder (which is unlikely) and there are no problems with the finger, you can not change it. But it wouldn’t hurt to wash it, just don’t rub it with a sandpaper, now there are a lot of different chemistry, although a chemistry bottle may turn out to be more expensive than a new piston. Are you sure everything is ok with your cylinder? And then there is chrome plating, very thin, it can peel off when overheated, by the way, therefore, the carburetor needs to be adjusted somewhat over-enriched (not only on friendship, but also on bourgeois saws), unless of course you manage to set it up at all. If this is really badass, then you need to change the entire CPG.
Tell me, please, about the lubrication of the gearbox: the gearbox has a plastic cover on top with the inscription "friendship-4a electron" on three studs - is this the cover of the oil tank under m8v? if yes, how to determine the oil level? On the gearbox, in addition to a large round cover (for lithol), there are no more holes except for a decorative cover with the inscription "friendship - Altai", which does not fit in with the instructions. Can you tell me how to properly use this node?
Usually the filler hole is also a control one if there is no other hole. You put the saw on a flat plane, fill in the oil, as it went back, the level means.
How to disassemble the CPG (piston group) on the Druzhba 4 chainsaw?
The dismantling of the connecting rod and piston group of the CPG chainsaw is carried out when replacing the piston, piston pin and crankshaft.
Dismantling is carried out in the following order: Remove the piston pin locks from the piston grooves,
Install the piston on a wooden stand with a hole for the piston pin to exit.
With light blows of a hammer through a metal frame with an outer diameter of 10.5-11.5 mm, knock out the piston pin from the piston bosses. Remove piston.
I use the Druzhba 4M Electron chainsaw for sawing thick logs. The ignition has been redone for a long time, it worked like clockwork for six years. But for the second time there was a malfunction, I changed four carburetors, the same thing. So, I start it from half a turn, it works in a horizontal position, it works for myself, I just tilt it away from me - no! Silent and everything. Looking for a fifth carburetor or is there another reason?
Your problem is not with the carburetor. On the saw, you need to replace the crankshaft seals and preferably the piston one and everything will work again.
There was a malfunction with the carburetor of the Druzhba 4 contact chainsaw. It starts up 1-3 times, but as soon as the speed starts up, it jumps and doesn’t fall, sometimes you don’t even drown it out. today I had to pull the high-voltage from the mouthpiece to silence it.
In the carburetor, you need to adjust the needle, if you have a problem, you need to lower it by one risk, the needle is attached with a crescent key. The second problem is open the carburetor, adjust the valve/reed to the ruler so that the protrusion on the reed does not reach the 05 mm ruler. In the carburetor, the rod with the needle walks along the guide and there are round ones, can the rod be replaced? supplied from another brand of carburetor. check it, check the idle jet is located at the bottom of the carburetor. Wrap it all the way and unscrew it one and a half turns, The needle needs to be adjusted.
I start to cut evenly, then the front of the tire shifts to the left and bites. What is it, a chain? Before, probably, this is a sock, where is the driven sprocket. Saw a thin log of 15 centimeters is not always possible even. And in a thick one, the tire generally wedges. There is no shock absorber, the chain needs to be sharpened.
The five-tooth leaf chain is structurally slightly different, if you look closely, we will see a few teeth on the left, a few teeth on the right. The very first tooth is undercut, followed by a cutoff, after the cutoff is ejected, then again undercut but symmetrical. All teeth are cutting, so the feed per tooth is less, and the load on the tooth is less, respectively, it wears out less and cuts faster, but not by 2 times, but by 20-45%, it all depends on sharpening, namely on the angle in the plan (if look from above), if sawing birch firewood, then the chain is sharpened with the same angle as the hook chain along the cutting tooth and the cutting tooth is sharpened with an angle of 5 gr. more, the ejecting tooth performs the same function as the stop in front of the hook, with the only difference being that it also cuts. For sawing oak, the angle is increased by 3-5 degrees on all teeth, except for the ejection one, it has an angle in terms of 0 degrees, it is updated only along the front surface through one sharpening. Teeth along the height of the scoring - cutting -0.4 mm, throwing out below the scoring by 0.9-1.5 mm mm. If the lamellar chain is sharpened along the front corner with a R-4 mm radius circle, the chain cuts even better, you can grind the ejection chain to a height difference of up to 2 mm, I usually sharpen old chains with a radius, this prolongs their life.
Need help with Druzhba-4 chainsaw, contact ignition. I changed all the seals, rewound the coil as it was written above, put a reel from a Muscovite, there is a spark, compression is 7 eyes, the crankshaft does not hang out, when you press the button, gasoline drips from the carburetor - it does not start. I poured gasoline through the candle hole, put a new candle - it started up and died out, after which it did not start again. Tell me, who knows what to do?
When adjusting the ignition - remove the engine, disconnect the snail, remove the flywheel, you need a puller, if anyone has a ratchet with an internal thread, you're in luck. Ignition installation - before reaching the TDC of 4.4 mm, we scroll by the centrifugal clutch, we bring the piston not reaching 4.4 mm to the TDC, we look at the contact breaker, this will be the beginning of the gap. Then we adjust the ignition timing, removed the muffler, under it there is a magneto mounting stud, there are 3 of them on the crankcase. everything is loosened on a hairpin and there are risks on the crankcase under the muffler (they are combined at the factory), we adjust empirically. We turn the magneto studs to the left, to the right - this is the ignition timing early, later.
How to properly disassemble the Druzhba Electron chainsaw gearbox?
Disassemble the gearbox in the following sequence:
- remove the drive sprocket;
- dismantle the housing from the large gear assembly with the driven gear;
- remove the friction clutch hub;
- unscrew the cover of the oil tank with the stopper, for which unscrew the five M4 screws;
- unscrew the cover and fixing screw;
- remove the oil pump plunger with the worm wheel;
- press the drive gear assembly with bearings and sealant out of the housing towards the hub with light hammer blows through a wooden mandrel.
Maybe someone dealt with the installation of electronic ignition on the Druzhba 4 chainsaw? After the breakdown, I decided to repair, replaced the crankshaft, piston, rings, cylinder and ignition, a complete upgrade. the ignition is set according to the marks as in the instructions, it started up immediately and abruptly got up. after 2 evenings of study, I discovered that I cut off the key on the magneto, so the ignition is not set correctly? installed a little later - it starts, works intermittently, stalls and again cuts off the key. Already cut 3 pieces with ignition experiments. Has anyone installed?
The flywheel is not properly seated on the shaft. It must sit tightly on the cone. Most likely, the flywheels are the same in landing, but they have a different number of magnets 3 and 4. And if the flywheel is not the right one, then there will be no spark. And what cuts off the key, so most likely there is no cone (marriage) either on the crankshaft or on the flywheel.
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Chainsaw carburetor adjustment friendship 4
Arborist Income from Waste
Chainsaw Friendship-4 - do-it-yourself repair. What to choose a chainsaw or an electric saw? How to choose the right chainsaw?
If you are the owner of the Druzhba-4 chainsaw, which is sometimes junk, then our article is just for you. We will talk about the more common dilemmas that the friendship 4 chainsaw presents, the repair of which is likely even at home.
If you are the owner of a Druzhba-4 chainsaw and understand how to work with a chainsaw that sometimes goes wrong, then our article is just for you. We will tell about the more frequent dilemmas that presents chainsaw friendship 4, repair which is likely even at home.
Contact ignition on Druzhba is very sensitive to different brands of gasoline and oils and causes a lot of trouble for many. Elements of such ignition are not repairable and not cheap. We advise owners of old chainsaws to change the contact ignition to electric ignition. This will free you from the constant troubles with its regulation and, as a result, save money. In addition, we advise you to read the article setting up the ignition of a friendship 4 chainsaw.
If the spark plugs are wet #8212 means the carburetor is overflowing. We eliminate the problem by slightly bending the gasoline valve inward. This will limit the amount of fuel entering the combustion chamber.
Carburetor adjustment
We tighten the fuel screw until it stops and unscrew the propeller screw three turns, tighten it until it stops and unscrew it two turns. It may be useful to seal the connection between the carburetor and the cylinder so that there is no air leakage - another possible reason for the saw to fail. You can use a special sealant or wrap the adapter with a strip of narrow tin. In general, all connections, including gasoline pipes, carburetor membranes, must be tight, this is the key to high-quality chainsaw operation.
For more detailed information about the Druzhba-4 saw, read the article Druzhba-4m Electron chainsaw operation department.
Gallery
Carburetor. mounted on saws. consists of a housing, the inner part of which is made in the form of an air nozzle (Venturi nozzle). The intake air from the engine flows through this air nozzle. The smaller the cross section, the greater the speed of the air flow, the greater the vacuum. Fuel jets are connected to various places of the air nozzle (diffuser), from which fuel is sucked in by the air flow. It is necessary to carefully adjust the chainsaw carburetor.
The fuel pump, injector system and adjusting devices for optimal preparation of the air-fuel mixture are integrated, or built into the housing.
Fuel consumption, and therefore engine power, is controlled by the throttle valve.
The impulse cavity of the fuel pump is connected through an impulse channel, low or high pressure controls the pump diaphragm. Thus, the fuel pump works depending on the engine speed.
Combustion of the air-fuel mixture requires oxygen, which comes with the intake air. In order to prevent dust and dirt from getting into the drive mechanism and carburetor, an air filter is installed in front of the latter.
Fuel is supplied by a pumping diaphragm from the fuel tank through the fuel line, the suction head, the carburetor suction pipe, the pump inlet and outlet valves and the fuel strainer to the inlet needle, and by the inlet valve to the diaphragm control chamber.
The inlet needle of the friendship chainsaw engine is connected to the control membrane by means of an inlet adjusting lever. The cavity under the control membrane is connected to the atmosphere through a hole in the cover. Changing the pressure in the cylinder and crankcase also affects the operation of the carburetor. At the inlet, a vacuum is created in the Venturi nozzle, and as a result, depending on the position of the throttle valve, an air flow occurs. At the same time, fuel is sucked from the jets and mixed with the passing air.
The fuel is sprayed in the diffuser (Venturi nozzle), as a result of which the air-fuel mixture necessary for combustion in the cylinder is formed.
The mixture is fed into the cylinder. Here, individual drops of the mixture are evaporated due to the high temperature.
The cavity under the control membrane is connected to the atmosphere, so the membrane is pressed upward. At the same time, the inlet needle is lifted from the seat by means of the inlet adjusting lever, and new fuel enters the membrane chamber. Thus, the regulating diaphragm is set so that a certain amount of fuel is constantly supplied, sucked from the jets.
The amount of fuel coming from the jets to the diffuser can be adjusted by the main adjusting screw and the working mixture adjustment screw when idling chainsaw friendship electron.
When the adjusting screws are unscrewed, enrichment occurs, when screwed in, the working mixture is depleted. The idle speed can be additionally adjusted by an idle fuel control stop screw located outside the carburetor crankcase, acting on the throttle shaft lever.
By means of the adjusting screws, the optimum engine power can be permanently adjusted for various external operating conditions (e.g. in mountains or at sea level). Friendship chainsaw repair is best left to professionals. And do not forget to follow the friendship chainsaw instructions.
Chainsaw owner review
I decided to create this topic on our favorite forum, because I did not find anything like this on the Internet - everywhere everyone writes randomly and there is practically nothing. So. Before, during and after each use of your chainsaw, you perform normal maintenance, which includes such procedures as cooking and fueling fuel mixture and chain oil, adjusting the chain tension, regular cleaning (after each use) of the undercover space (sprocket, chain brake, oil supply) and tires with a chain, straightening a dull chain, cleaning the air filter and others. But sooner or later your chainsaw. regardless of the brand of the manufacturer, it undergoes some slightest repair. For more than 2 months I have had an impossibly simple Ryobi chainsaw (ryobitools.ru) PCN 4040. French assembly and from the same Chinese (like all other saws, including high-profile brands such as Shtil and Husqvarna), but pretty good quality parts. Later I found out that this is the twin sister of the HomeLite 4016 saw. Only in a different color and with other branded stickers. In general, it doesn't matter.
During this short period, 3 malfunctions were identified and eliminated: 1. It became very difficult to start (it starts up normally, everything is according to the instructions, but after working for 5 seconds it stalls. 2 times I had to carry out the procedure for a complete start of a cold engine - then it starts up normally). 2. There were dips (up to stalling) during acceleration at minimum-average speeds. Initially, from the purchase, they were also, but somehow softer. 3. At medium-high speeds, the saw began to shake in the hands and, synchronously with this, emit wah-wah with a frequency of about 20-30 Hz. The first 2 malfunctions appeared almost simultaneously, and therefore plunged me into shock and misunderstanding. I read on the internet about carburetors, ignition systems, I even found and downloaded the full detail (.) of my saw! I'm afraid to disassemble the saw - a guarantee after all. Once patience snapped and twisted (twisted and unscrewed to the same position) screw L of the carburetor. The screws L and H have plastic tips-limiters (you can’t twist them too much - only half a turn each). Hurray, the malfunction of point 2 immediately disappeared! So the carb was a little unfinished from birth. The saw after that began to accelerate beautifully. But point 1 did not disappear and at the same time point 3 appeared. I climbed the entire Internet. I also read about tripping (single-cylinder engine, about detonation, etc. I replaced gasoline, it’s useless. I spat, I took off the top cover of the crankcase. The air filter was very clogged (sawdust + dust + reinforced with oil). I unscrewed the candle (Champion was screwed in.) And accidentally broke it, (for the sake of interest I decided to unscrew the tip, damaged the central electrode). The spark stopped appearing. I ran to the grandfathers market, as usual to motorists, there is no such candle! at the only one selling power tools there, he unexpectedly gets me the same, only OREGON's candle in the package! I naturally called him handsome and well done, gave him 100 rubles for it. I warmed up the engine a little and gave heat. There was a lot of happiness. After that, my girl buzzes evenly and clearly, as before, does not shake, and at the same time, in addition, she gains momentum beautifully (dynamically) when the trigger is pressed.
Bottom line: The carburetor was a bit unfinished at the factory. Only 1-2 degrees of a full turn. Zaser air filter aggravated the situation - there were serious failures in acceleration. It's to blame i-in instructions Written - regularly check the condition of the air filter! I almost forgot about him. The French decided to save money and screwed in a cheap Chinese fake candles of the famous Champion brand. It can be seen from the candle that this is bullshit. From here, over time, a bad start appeared and the engine was shaking at medium speeds - the candle began to give out an unstable spark (or a bad spark, I don’t know). Everything was decided. And further. The material of the air filter is nothing more than the material of commercially available wipes such as pressed cotton wool (sold in every hardware store - multi-colored, and made in almost any city, including our Kislovodsk). So, if you are too lazy to wash, they tore off the old one, cut out a new one and glued it on. So I propose to share our experience and tricks on the repair and maintenance of modern chainsaws!
Chainsaw Friendship
It would be more correct to compare Druzhba-4M and Druzhba-5. They just seem to be released now. It's hard to find anything for older models. Need luminaries Friendship-4 Specifications.
Petrol engine, single cylinder, two stroke Power 2.94 kW Fuel consumption: 720 g/kWh Corrected level of vibration velocity on control handles 7.9x10-2 m/s Weight: 12.5 kg Overall dimensions 500x865x460 mm Friendship-4A Specifications.
Power: 2.94 kW Number of revolutions: 5200 min-1 Fuel consumption: 720g/kW h Lubricant consumption: 5-9 ml/min Working length of the saw unit: 46 cm CPU Chain Pitch: 10.26mm Sound level: 105dBA Permissible contact time: 80 min. Corrected level of vibration velocity on the control handles: 7.9.10-2 m/s Dry weight (without starter): 12.5 kg * Overall dimensions 500x865x460 mm Just in case: Repair of the chainsaw ignition unit. Friendship-5E Specifications.
Engine - gasoline, single-cylinder, two-stroke. The engine is equipped with an electronic ignition unit. The presence of a rotary gearbox - the saw unit can be rotated to any angle up to 90 '', depending on the work performed. Power: 3.68 kW Number of revolutions: 6200 min-1 Fuel consumption: 632 g/kW h Lubricant consumption: 5-9 ml/min Working length of the saw unit: 46 cm CPU Chain Pitch: 10.26mm Vibration acceleration on handles: 13.67 m/s2 Sound level: 105dBA Permissible contact time: 80 min. * Dry weight (without starter): 11.7 kg Judging by the indicated characteristics, this model does not differ much from the previous Druzhba-4M Electron. Although the manufacturer has painted quite a few innovations that distinguish Druzhba-4M and -5E from their predecessors: Improvement in the quality of gasoline-powered products In general, this is all that I managed to find on the Internet. You can find out more on their website (try asking them a question in the question-answer button, maybe they will say something - F.E. Dzerzhinsky Plant)
Sources: http://newautomobili.ru/regulirovka-karbyuratora-benzopily-druzhba/, http://silo-z.ru/benzopila/891, http://www.mastercity.ru/forums/sadovye-dela/sadovyj -instrument/t11856-benzopila-druzhba/?page=2
A technique such as the Friendship chainsaw will never lose its relevance. Although petrol models are increasingly being replaced by electric chain saws, the demand for Friendship is falling reluctantly. For the popularity of any technique, reliability, low price and ease of operation and maintenance are needed. That is why Friendship is not going to give up positions. Great design for a reasonable price.
The man and the drink. History of Friendship
The design of the saw was tested back in 1953. Only two enterprises produced the saw, the Perm and Biysk plants, but due to the fact that the demand for the model has always been high, its production has recently been mastered at numerous small-scale enterprises. Mass production of Friendship began in 1955, and three years later the saw was shown at an international exhibition in Brussels, where it received a gold medal.
There are a lot of speculations about the name of the device, Druzhba cheese, and supposedly a joint Soviet-Chinese development, and even the 300th anniversary of the signing by Bohdan Khmelnitsky on the entry of the left-bank part of Ukraine into Russia are dragged here. No one really knows how it was, but the fact that the chainsaw has become an ideal replacement for the two-handed saw, which was also called Friendship, is a fact.
The chainsaw index always contains a numerical value - this is the engine power in horsepower. Sometimes the letter E appears, which indicates the use of electronic contactless ignition. The design of the saw was excellent. Separately the engine, and separately the saw mechanism. They are simply twisted into a single block and, if necessary, in a few minutes you can get access to any mechanism and part, and without tricky pullers and special experience and skills. The only difficulty with a completely politically backward element was the adjustment of a primitive carburetor, which, despite the prehistoric design, honestly did its job.
Chainsaw engine Friendship
Chainsaw Friendship specifications which was provided with a practically perpetual motion machine, thanks to the engine, and received great respect from zealous owners, but not only them. Whole hordes of do-it-yourselfers, whole generations of technical maniacs were inspired by this simple motor, which was freely available. Some lumberjack in British Columbia would not understand what this engine meant to mechanical technicians. There were practically no engines of such a volume and such power in the country, and microcars and home-made agricultural machinery were assembled on the basis of the apparatus, even the production of small X3 aircraft was prepared. They were mounted propeller blocks, consisting of 4 engines from the saw.
True, they never went into the series, because they did not officially pass flight tests. But on the other hand, the industry of the country of the Soviets pounced on the motor and furiously began to introduce a mass of equipment into production, where a small-capacity reliable gasoline engine was needed:
walk-behind tractors;
This is how 4 horsepower in a ridiculous volume of 94 cm³ came in handy for the needs of the national economy of a huge country.
Modifications and design of the Druzhba chainsaw
For 60 years of production, the design of Friendship has not changed in any way. It's still the same two-stroke stokkid engine, from time to time the engineers raised the power, depending on the application of the engine, but on chainsaws it remained unchanged. A little later, electronic contactless ignition began to be installed on the motors, which significantly increased the reliability of the motor.
Until the end of the 80s, Druzhba 4A was produced with an electric magneto and a KMP 100 carburetor, after using the contactless system, the saw became known as 4E Electron, in the 90s the carburetor was modernized by the designers and the saw received the M prefix, and later, based on the Druzhba design elements, they developed more productive Ural saw.
Friendship, like any mechanism, can break down. And unexpectedly and for a long time. But those who know her whims are always ready to repair the device even in the middle of a field or in the taiga. The main troubles of the saw were associated with contact ignition and a carburetor. The fact is that, contrary to talk about the omnivorousness of the saw, not every gasoline could make the engine work to its fullest. That is, it worked, but constant adjustment of the ignition was required. The motor was too sensitive to the octane number of the two-stroke mixture of gasoline and oil, which he ate. Contacts, as a rule, cannot be repaired, and if they are restored, then this is not for long. It is better to immediately replace them with new ones, or even better to immediately install a contactless system.
Another trouble with the motor part of the saw was the leakage of the power system. Today, in principle, it is already possible to use sealants, so this issue is no longer relevant. As a rule, it is especially necessary to seal the mating plane of the carburetor and cylinder with particular care. and the saw mechanism need only periodic lubrication and fail extremely rarely.
The device, which has unprecedented reliability and endurance, a gold medal from the exhibition and the ardent love of the public, is still being produced and you can buy Friendship in Metal for 6-7 thousand, depending on the modification, and forget about problems with sawing wood for a long time.
- high productivity and the possibility of a long time of work without interruption for 50 minutes;
- simple design;
- the presence of high handles, thanks to which you can saw in a standing position, they also provide safer use and reduce vibration;
- accessible location of all parts;
- the chain is set in motion by high engine speeds, at idle it is motionless;
- low octane fuel can be used;
- the presence of an emergency brake in most models;
- when the saw chain is stuck, the saw does not stall;
- accurate and even cut;
- the service life, subject to the rules of operation and proper care, can be from 15 to 30 years.
The main disadvantage is a lot of weight. Also, because the starter is removable, it is often lost, and there is no stop button.
Do not use leaded gasoline as fuel and do not run the saw in a closed room.
Thanks to the simple design, the repair of the Druzhba chainsaw can be done by hand. So, for example, in saws of this brand, problems with ignition often occur, especially if a contact is installed. It is extremely sensitive to various oils and gasoline. Therefore, it is better to purchase electronic ignition instead. Moreover, spare parts for a friendship chainsaw contact are expensive and irreplaceable.
If the candles are heavily flooded, then you should pay attention to the carburetor. In this case, it is necessary to slightly bend the gasoline valve inward, as a result, the amount of fuel supplied will decrease and the candles will stop getting wet.
The carburetor is also easily adjusted:
- The fuel screw is tightened to the end and unscrewed back 3 turns.
- The air screw closes completely and turns off 2 turns.
To prevent air from being drawn into the system from the outside, all seals must be tight.
Compared to other models, the Druzhba chainsaw is sold at a lower price due to the small number of functions, but it has excellent quality and a long service life that imported models cannot boast of.
The main malfunctions of the Friendship chainsaw - video
Petrol saw "Friendship"
"Friendship" - chainsaw model. Developed at ZMKB "Progress" them. Academician A. G. Ivchenko in November 1953 Manufacturers - Machine-Building Plant. Dzerzhinsky (Perm) and State Unitary Enterprise PO Sibpribormash (Biysk). Produced in mass production since 1955. In 1958, at an exhibition in Brussels, she was awarded the "Gold Medal". In the 90s, the production of saws and spare parts for it was also mastered by small private enterprises in various cities of Russia.
Name history
The name "Friendship" was given in honor of the tercentenary of the reunification of Ukraine with Russia, celebrated in 1954.
Design features
MP-1 engine designed by ZMKB Progress im. Academician A. G. Ivchenko - single-cylinder, two-stroke, carburetor, air-cooled, working volume 94 cm3, power 4 hp. Engine lubrication - oil mixed with gasoline. The engine and the saw unit are made as independent units and are connected to each other using a flange connection, fixed with a clamp (which is attached to the saw handles). This arrangement allows you to rotate the saw unit at any angle, if necessary, quickly replace the failed unit. Due to the functional completeness and ease of fastening, the Druzhba chainsaw engine was used to drive motoblocks (Kumir, Sadovod), water pumps (Skif, TsBN-1, TsBN-2, PMP-4), DC generators ( GZ-106A) for charging batteries in the field, mechanical winches for skidding forests, in the Kama outboard motor, in lawn mowers. This engine was also popular with those who like to build equipment with their own hands. In the 60s, attempts were made at the Moscow Aviation Institute to force this engine and install it on ultralight aircraft. Light helicopters X-3, X-4, X-5 were manufactured, each of which was equipped with propeller units of 4 Druzhba engines operating through a common gearbox on the main rotor. None of the devices failed due to the low reliability of the engines.
Modifications
Over the years of production, the general design of the saw has remained the same, however, minor changes have been made:
In the 50s - 60s, a modification of the "Friendship" was produced with the handles attached to the fan cover, later the handles began to be attached to the clamp connecting the engine and gearbox.
Until the end of the 80s, the Druzhba-4A model was produced with a contact magneto and a KMP-100 carburetor - discontinued;
At the end of the 80s, electronic ignition was used (from the non-contact magneto MB-1), the saw received the designation "Druzhba-4A-Electron";
In the 90s, a more advanced KMP-100U carburetor was used, the saw was designated Druzhba-4M (produced by ZiD) and Druzhba-Altai (produced by Sibpribormash), saw chains of a modern type were used.
Based on the engine of the Druzhba chainsaw SD-60 for driving stationary installations (generators, pumps), which differed from the prototype in a cast-iron cylinder sleeve, a float carburetor, a non-removable cable starter and the presence of a speed controller.
Advantages and disadvantages
The Druzhba chainsaw was developed in the early 50s and by the end of the century was already significantly outdated. The saw has big weight - 12 kg. Initially, the reliability of the saw was high (a number of saws manufactured in the 60s are still in working order), but in the 90s it dropped significantly due to factory defects and production by small firms that do not have the necessary materials and technologies. inconvenient and often lost. there are no elements that ensure its safety (Stop button, chain brake, Anti-kick function). Nevertheless, the simple design of the saw and its good knowledge, combined with a low price and high sawing performance, make Druzhba popular at the present time.
The advantages of the saw also include the high location of the handles relative to the cutting plane, which allows the operator to work while standing in a comfortable position (work with modern saws when felling trees is carried out in the position of the operator on his knees).
Interesting Facts
In Romania, the name "Friendship" has become a household name: in the colloquial language, the word "drujba" is used in general, regardless of the model (although this meaning of the word is not recorded in academic dictionaries).
The name switched to a two-handed saw, which, when working with it, requires the coordinated actions of two people, and for this it is sometimes jokingly called "Friendship-2".
This saw is mentioned in the song “There was an escape to a jerk” by Vladimir Vysotsky.
One of the first samples was made in a sharazhka not far from the Lapshanga station by Kyiv aircraft manufacturers.
Chainsaw Friendship creation story
Chainsaw Druzhba - chainsaw model. Developed at ZMKB "Progress" them. Academician A. G. Ivchenko in November 1953 Manufacturers - Machine-Building Plant. Dzerzhinsky (Perm) and State Unitary Enterprise PO Sibpribormash (Biysk). Produced since 1955. In the 90s, the production of saws and spare parts for it was also mastered by small private enterprises in various cities of Russia.
Mass production of the Druzhba chainsaw began in 1955 in Perm, and already in 1958, at an exhibition in Brussels, the product was awarded the Gold Medal. The chainsaw was named Druzhba in honor of the 300th anniversary of the reunification of Ukraine with Russia, which was celebrated in 1954, but some sources mention the joint development of Soviet and Chinese specialists, immortalized in the name. The power of a single-cylinder two-stroke internal combustion engine used in a particular chainsaw model always appears in the title. 4 - hp, if Druzhba 4E - the engine is the same, only with electronic ignition. The power unit and the engine are made independent and are assembled on a flange connection, which allows the saw unit to be located both in horizontal and vertical planes, and replacing a failed unit is quite simple and does not present any particular difficulties. Easy disconnection of the engine and its unpretentiousness, gave scope for creativity and wide application of its home craftsmen. Friendship - 4A begins the use of automatic lubrication of the saw chain, which significantly increased the service life of both the chains themselves and the guide bars. Tires are produced universal, allowing the use of chains with different pitches, provided that the drive sprockets are replaced and the damping device is working. The clutch is inertial, setting the chain in motion by increasing the engine speed, and not allowing it to stall when the chain is bitten or overloaded. The dry weight of all models is about 12 kg, and the latest Druzhba chainsaws are already equipped with an emergency chain brake. Due to low revs, the Druzhba chainsaw engine is able to absorb any oils, and working with low-octane gasoline and mass production allowed this technique to be in almost every village yard in Russia.
The Druzhba 4 chainsaw engine consists of the following main assembly units:
Crankcase 24, crankshaft 21 with connecting rod, piston 12 with piston rings 11,
Cylinder 15, centrifugal friction clutch 17 and has systems:
Ignition, cylinder cooling and exhaust, power supply.
The engine cylinder is made of aluminum alloy. To improve wear resistance
Its inner working surface is chrome-plated.
The tightness of the crank chamber of the engine is ensured by rubber
Seals 5 and 20, paronite gasket 16 and paper gasket 25.
The friction clutch consists of two parts - leading and driven. Leading part of the coupling
Mounted on the shank of the crankshaft of the engine and consists of a leash 17 and two
Split cast iron rings 26.
The driven part of the coupling (hub) 8 and mounted on the shank
Reducer drive gear.
Lubrication of crankshaft bearings, working surfaces of crank parts
The connecting rod group during engine operation is carried out by oil, which is part of
fuel mixture.
Friendship 4 chainsaw ignition system includes: contactless magneto 7 and flywheel 4, wire
Ignition 11 and insulator 10 (Figure 3) with an interference suppressor and a candle
Ignition 10.
Contactless magneto EM-1
Circuit diagram
Magneto EM-1
All semiconductor elements: five diodes, thyristor, resistor and capacitor
Mounted in the base chamber and filled with a sealing compound. In case of exit from 
By building one of the elements in the base chamber, the magneto cannot be restored.
Magneto EM-1 provides the beginning of sparking on a candle at a speed of rotation
Flywheel 400-600 rpm, so the magneto should be checked for sparking
To make rotation of a cranked shaft of a starter with a frequency not less than specified. Wherein
It must be taken into account that the temperature of the spark produced by magneto EM-1 is significantly
Higher than from a contact magneto, and the spark is hard to see in daylight.
This is not a magneto defect. Magneto normally works at temperatures up to plus 85 ° C
(temperature of the magneto case). If the specified temperature value is exceeded at
Chainsaw operation, the magneto electronic unit may fail.
To avoid premature failure of the magneto EM-1, observe
Rules for the operation of a chainsaw.
Magneto is attached with two screws to adapter 4, which, in turn, is attached to
Crankcase with three studs and nuts 6 .
A spark between the electrodes of the spark plug appears at the moment when the piston is not
Comes to V. M. T. by 2.55 mm, which corresponds to the angle of rotation of the crankshaft to V. M. T.
22°, which is the ignition timing.
Factory setting ignition timing vs. marks 7
Risk 3 is placed on the magneto on the adapter 4. In this case, the studs
The adapter must be in the grooves of the crankcase in the right extreme position.
The position of the adapter in the crankcase is fixed with a mark 5 on the pin and on the crankcase
Engine. When installing a magneto after its replacement, after maintenance or repair work
During the operation of the chainsaw, these risks must be combined.
Flywheel four-pole, mounted on the cone of the crankshaft, fixed
With a key and fastened with a M10X1 nut. In the hub of the flywheel, a ratchet 6 is threaded to start the engine with a starter.
ATTENTION. A flywheel with three magnets cannot be installed on a chainsaw.
(poles) from previously produced chainsaws with a contact magneto.
The high voltage wire is screwed into the outlet pipe at one end.
High voltage transformer 5, the second end has. threaded bushing for
Insulator connections 10.
The insulator 10 is made of a dielectric material. In the insulator on the thread is installed
Terminal screw 4 (Figure 6). Suppression of radio interference arising from the operation of a chainsaw,
It is carried out by damping resistance in the shielding cap 6.
Spark plug with threaded M14><1,25 и размером шестигранника под
Key. The normal size of the gap between the electrodes of the candle is 0.6-0.7 mm.
Forced air cooling of the engine. The cooling system includes
Impeller 3, cast in one piece with the flywheel, crankcase cover 2 and deflector 1.
The air flow is created by the impeller 3, through the channel formed by the crankcase cover 2
And the crankcase 24 flows through the deflector 1 to the cylinder 15, providing its cooling. Fence
Air is produced through the protective grille of the crankcase cover.
To reduce exhaust noise and extinguish sparks, the engine
Equipped with silencer 8.
The friendship chainsaw gearbox consists of a body 5 and two bevel gears - drive 4 (14
Teeth) and driven 12 (23 teeth),
On the shank of the drive gear shaft, the driven part of the friction
Couplings - hub 8, and on the roller of the driven gear - drive sprocket 13 of the saw chain. On the
The gear housing is fixed with a toothed stop 18, which rests the chainsaw against the wood when
Sawing.
Bearings and gears are lubricated with grease
The tightness of the internal cavity of the gearbox is ensured by rubber seals
7 and 11. 
The Friendship chainsaw frame consists of a steering wheel 8 with handles and a gas tank 6 and a rack 10. Between themselves
They are connected by a vibration damping device consisting of a squad 9 and a hinge assembly 11.
The hinge assembly is shown in fig. 9. At the bottom of the rack there is a clamp for connecting and
Motor and gearbox mounts.
The saw unit of the Friendship 4 chainsaw consists of a saw bar 18 with a driven sprocket 19 and
Saw chain 17. The bar is attached to the gearbox key with a stud 21 and a nut 22. Tension
The saw chain is adjusted by screw 16 of the tensioner. Turning on and off
Saw chain automatic centrifugal friction clutch.
The working length of the saw tire is 46 cm.
Sawing unit for sawing in a horizontal plane (for felling trees) and for
Sawing in a vertical plane (for cutting whips, sawing firewood) translates
By turning the reducer by 60-90 ° with the collar clamp loosened by the eccentric lever
Clamp 13 .
The design of the starter is shown in the figure. When pulling the cable by the handle 11 when
When starting the chainsaw, the roller 4, rotating, pushes forward the ratchet 6, which engages
With engine ratchet and rotates the crankshaft. In this case, the spring 8 is twisted. After
Starting the engine, the starter ratchet disengages from the engine ratchet, and the spring
8, unwinding, winds the cable onto the drum.
The chainsaw power system consists of a 6 gas tank with a sump,
Fuel cock 5 with filter, carburetor KMP-100AR or KMP-100U, fuel line 4 and air filter 12.
Purification of fuel from mechanical impurities is carried out by mesh filters 2
The air filter cleans the air supplied to the Friendship 4 carburetor from
Sawdust and dirt. It is not recommended to work with a faulty air filter mesh.
Carburetor Druzhba 4 KMP-100AR is a floatless membrane carburetor, consists of
The following main units: diffuser body 9, fuel chamber body 2, diaphragm 10
With enrichment button 12, cover 13, throttle 8, with needle 4 and cup 6, cable
Throttle control and air filter 5.
The fuel level in the fuel chamber with the engine running is maintained
Diaphragm 10, by acting on the spring 11 and on the lever with the valve 14, due to the difference
Between atmospheric pressure and pressure in the fuel chamber.
The amount of the working mixture entering the engine cylinder is determined by the position
Throttle 8 with needle 4 in the diffuser housing.
Button 12 serves to fill the carburetor with fuel before starting the engine.
Through the channels, the flow area of which is regulated by screws 3 and 15, the fuel is supplied to
Sprayers. Atomized fuel (working mixture) enters the crankcase due to vacuum,
From where, when the piston moves to N.M.T. through the channels of the cylinder, it enters the over-piston 
Chainsaw assembly "Friendship-4M Electron"
Without starter, kg 12.5
Movement of the chainsaw when felling from right to left
Sawing performance, cm2/s 75
Cutting speed at RPM
crankshaft=5000-5400 min-1
(calculated), m/s 9.6
Automatic saw chain lubrication system
Weighted total vibration acceleration on the handles
Chainsaws, m/s2, no more than 13.67
Sound level dBA, no more than 105
Dimensions:
Width 460
Height 500
Chainsaw engine Friendship 4
Bore 48
Engine power after 25 hours break-in
In operation, kW, (hp) 3 (4±0.5)
Fuel consumption at maximum
Power, g/kW-h (g/l.s.h.), no more than 720 (530)
Chainsaw repair
Contact ignition
Contact ignition on Druzhba is very sensitive to various brands of gasoline and oils and causes a lot of trouble for many. Elements of such ignition are not repairable and not cheap. We recommend owners of older chainsaws to replace the contact ignition with electronic ignition. This will save you from constant problems with its regulation and, ultimately, save money.
If the candles are wet, then the carburetor is overflowing. We fix the problem by slightly bending the gasoline valve inward. This will limit the amount of fuel entering the combustion chamber.
Carburetor adjustment
We tighten the fuel screw until it stops and unscrew it three turns; tighten the air screw until it stops and unscrew it two turns. It may be necessary to seal the connection between the carburetor and the cylinder so that there is no "leakage" of air - another possible reason for the inoperability of the saw. You can use a special sealant or wrap the adapter with a strip of thin tin. In general, all connections, including gasoline pipes, carburetor membranes, must be tight, this is the key to the quality operation of the chainsaw.