How to Remove a Chain Drive on a Chainsaw
How to remove the chain from the saw AURAMM.RU
How to tension a chain on a chainsaw?
The majority of the population, having first encountered the operation of a chainsaw, are wondering how to pull the chain on the chainsaw correctly. Installation of the circuit is not its adjustment does not require extra time.
Properly stretched chain chainsaws will ensure the longevity of its work.
In order to answer this common rumor, a question should be studied the device of the chainsaw. The device consists of several main units that ensure its operation.
A chainsaw consists of the following main structural elements:
- gasoline engine;
- guide bar for the saw chain;
- saw chain;
- chain tensioning mechanism;
- device controls
The chainsaw drive is based on a single-stage chain drive.
By its design, chainsaws belong to the classic mechanisms that are driven using an internal combustion engine. The design of the device uses the simplest single-cylinder two-stroke engine. Instead of a gearbox, the device uses a single-stage chain transmission, which ensures the rotation of the saw chain. The simplicity of the design ensures reliable non-failure operation of the unit in severe operating conditions.
The engine installation of the unit includes the following structural elements:
- working cylinder with piston group;
- ignition module;
- air purification system;
The motor of the device is capable of developing a maximum of thirteen 500 rpm. Such high rates impose stringent requirements on the fuels and lubricants used during its operation. The force from a running engine is transmitted to the drive sprocket in the presence of a centrifugal clutch, which is automatically activated when the engine speed rises. The clutch consists of a drum not elements with friction linings. When the engine reaches a certain number of revolutions, the elements are pressed against the drum, not the last one begins to rotate, setting the drive sprocket in motion, in engagement with which> <engaged is saw chain.
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The ignition system is a non-contact electronic device that allows for stable operation of the power plant of the device. The fuel supply system consists of a tank for storing fuel, a non-carburetor pipeline. The carburetor is a device that provides the preparation of a combustible mixture at the work of the power unit.
The working tool of the chainsaw is the saw chain, the movement is busy> occurs on a special guide rail, due to the rotation of the leading non-driven sprockets.
The device of the working element of the chainsaw, its guide, brake and tension mechanism
The chain alternates cutting non-leading links.
The working element of the saw consists of three types of elements:
- cutting links;
- leading links;
- connecting elements.
All elements are assembled with rivets. The most complex structural elements are cutting links. This common rumor is the type of structural elements you will like two types: right- left-handed. These elements provide sawing wood.
The tire is the most important structural element of the device, which serves to guide the saw chain. The tire is manufactured using wear-resistant steel, which has high elasticity. On the periphery in the tire structure there is a special guide groove. Oil is supplied through the groove to provide lubrication. A feature of the tool is the presence of an open cutting organ, which is a danger to humans. To ensure safe operation, a special device called a brake is used. The device is turned on by pressing the protective shield.
how take off chain with chainsaw
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When the brake is applied, the brake tape is tightened on the clutch drum and it does not stop. And so these actions stop cutting organ.
The system of tension of the cutting body includes a movably connected screw. When the screw rotates, the pin moves along the groove in the saw body, which causes the tire to move. Tire movement leads to tension cutting organ. For ease of operation, the tension screw on some models of the unit is located on the side, outside the cover of the protective cover that covers the drive sprocket of the drive device. Each new chain installation requires adjustment of the blade tension.
Chain tension: when necessary and how to do it
Lack of slack is a sign of proper chain tension.
To check the degree of chain tension, it is necessary to pull the chain upward, taking it by one of the teeth in the top located above the guide bar. If the chain tension is normal, then one third of the tail of the tooth will be in the groove of the guide bar of the chainsaw.
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An increase in this indicator indicates that the saw chain is too tight, and a decrease indicates that there is too little tension. One of the most important indicators chain tension is its free movement along the guide rail. This requires chain rotate along the guide. how the oil should move under light influence.
Subsequently, using protective gloves, turn the chain in the direction of travel. If the passage of the chain loosens too much on the back of the tire, there will be a lot of slack. Exactly > myth sign indicates holding chain tension.
Chain tension does not take a long period is not a laborious process.
After detecting a sag, it is necessary to loosen the nuts or screws that fix the guide rail on the basis of the unit structure. Then, using the adjusting screw, the tire is moved forward, choosing the degree of tension. During the tension, it is recommended to periodically rotate the saw element to select the optimal articulated backlash and not control the smoothness of its movement along the guide rail. After adjustment, it is necessary to tighten what remains to do to our client the fixing elements do not restore the unit’s performance.
After the adjustment is made correctly, the movement is uniform not without snacks, during the movement of the working element along the guide, a slight inertia should be maintained. If the tension is too strong, movement is difficult, and when the exposure ceases, the working tool instantly stops. The constriction is much more harmful than undershot. If the passage, if a new chain is being installed, the tension will be minimal, since the constriction of the working element can lead to wear on the guide of the chainsaw.
Diagnosis and ear
How to Remove a Chain Drive on a Chainsaw
How to remove the clutch on a chainsaw
The chain saw clutch drum, which is also the drive sprocket, is a consumable item, so periodic replacement is required. The main reason for the replacement is: wear on the teeth of the sprocket chain. If the drum is monolithic, then during prolonged operation chain just cuts the sprocket, and you need to change the whole drum. On some chainsaws, the clutch drum has a replaceable crown, which also wears out. In this case, only the crown changes, the drum, if it is in good condition, remains for future use.
Many saw owners do not think about how to remove the clutch on a chain saw on their own, because they have the opportunity to contact the service. But this possibility is not at all, for this we publish this article, in which we will explain step by step how to remove an asterisk from a chainsaw.
This operation is not difficult if you have tools and parts. In the article, for example, all actions are performed using the Echo CS-3500 chainsaw, all operations for replacing the clutch drum for other chain saws are similar.
- First you need take off saw headset: unscrew the universal nut with the nut of the nut of the tire cover and remove the tire and chain.
Changing the sprocket on a Chinese chainsaw
Repair and maintenance tips chainsaws Thanks for your husky under the video! Subscribe to our channel.
How to remove grip on a gasoline saw How to remove grip on a gasoline saw
how to unscrew the clutch chainsaw for repair. how to loosen the grip on a chainsaw for repair.
- Remove the filter.
- Using an ordinary universal key, we unscrew the candle.
- To fix the piston in the cylinder, instead of a candle, twist the piston plug.
- Take the clutch puller for this chainsaw model and install it in the universal key.
- Unscrew the clutch clockwise.
- Remove the clutch drum.
- Change the clutch drum or crown to a new one, check the condition of the clutch separator. We collect the chainsaw in the reverse order.
How to Remove a Chain from a Stihl Chainsaw
How to chainsaw: instructions and recommendations
Professionals are well aware that not the power of the chainsaw makes it a good tool, but how well it is used. With proper care, any chainsaw can last a long time, demonstrating excellent performance. If vice versa. Do not follow the tool properly and do not adhere to the rules of safe operation, this will significantly reduce the service life and lead to an early failure.
One of the most important points of proper technical operation is chain chain care. You need to know how tighten the chain on a chainsaw, how to grind it and lubricate it correctly. It is also very important to have an idea of its characteristics. This knowledge can be very helpful if you need to.
Chain function and proper tension
The correct position and tension of the chain is very important not only for normal operation, but also for the safety of the person who works with him, as well as around him. If the chain has an incorrect tension, then during operation it may accidentally fly off, which is likely to cause breakdown not only of the chain itself, but of the entire chainsaw. However, this is undesirable even if the chain is too tight. This can also have negative consequences in the form of an increase in the load on the engine, which in the future will lead to its rapid failure and shorten the overall service life of the chainsaw. The chain has one very important property: it fixes the tire, which prevents its arbitrary movement. Therefore, attention to the chain should be given special attention.
Choose the right chain
A chain malfunction is common, so before you ask yourself how to properly tighten the chainsaw, you need to know which chain is suitable for this model of chainsaw. The main selection criterion is its step. Step. distance between his teeth. The distance it is selected between the nearest teeth is measured in inches. The most common are 0.325, 0.375 and 0.404 inches. Information on the step can be found in the operating instructions for the particular model of chain saws, and this depends primarily on the purpose of the tool.
Each saw has its own specific step, exceptions. these are only professional tools that are universal. The chain pitch also depends on engine power. The more powerful the chainsaw, the greater its height and the more difficult it is to hold it during operation. For example, the Patriot compact low-power chainsaw has a pitch of 0.325. However, there are more powerful models. One of them. German STHIL in increments of 0.404. This, as we see, is more than a Patriot chainsaw.
Step. one of the most important characteristics of circuit parameters. This means that you should not choose a chain with a big step for a chainsaw with low energy consumption. This can not only fail, but also disable the tool.
The importance of proper chain configuration
The normal operation of the chainsaw causes vibrations that can significantly weaken the chain tension with blades or nuts designed to secure it. The chain stretches during heavy use and is not well fixed on the teeth of chain saws, which can create unsafe conditions for the operator. Proper tool operation includes checking all nuts and bolts before and during use to ensure safety. If the chain nuts are too loose on the teeth of the saw, you will most likely need to properly pull out the chain and then tighten the blade.
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Before you start, always remember your own safety and use protective leather gloves and safety glasses. A chainsaw should be placed on a flat surface, such as a bench or table. Before using it, it is necessary to completely cool the engine. Then, to prevent accidental starting of the saw, remove the wire from the plug of the spark plugs. Now you can start setting up the circuit.
Stihl 180. Replacing the chain.
New video on how to make the tension system more comfortable: Thank you,
How to tension a chain of a chainsaw Stihl MS 180
Operation tips Stihl chainsaws MS 180 Thank you for your likes under the video! Subscribe to our channel
How to pull a chain on a chain saw yourself
This is not difficult to do, the main thing. remember your own safety. So, how to put the chain on the chainsaw? Stand in front of the chainsaw with the blade facing you. Grasp the tip of the saw blade with one hand and raise it slightly. Firmly insert a flat-head screwdriver into the adjustment screw, which is located to the right of the blade when you look at the saw blade. Turn the screw clockwise to or counterclockwise to reduce it accordingly. Grab the chain in one hand and pull it around the blade. The voltage is correct if it is slightly weakened by pulling in the direction of the blade and at the same time tightly adhering to it.
If so, further chain adjustment on the chain saw may not be necessary. If not, then you need to configure it. Loosen or tighten the adjustment screw to get a proper fit. Hold the tip of the chainsaw blade with one hand. Tighten both blade clamping nuts on the left side with a saw repair kit or adjustable wrench. Put the spark plug wire in place and press it firmly.
When buying a chainsaw, it is often equipped with a tool for its maintenance. You must configure the circuit. It has the following form: at one end there is a screwdriver with a flat head, and on the other. a key that fits the blades. To understand how tighten the chain chain saw, see the operating instructions for this model of saw.
When using a chainsaw, personal protective equipment should be used, including eye and hearing protection, leather gloves and a hard hat.
To ensure safety when working with a chainsaw, it is advisable to have another person nearby who can help if necessary.
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How to Reduce Chain On AURAMM.RU Chainsaw
How to shorten the chainsaw chain without the help of others?
- The right tools
- How to remove rivets?
- Link Connection
- Bad consequences of improper circuit repair
- Contact an experienced welder
- How to make the right rivets with an electric drill?
- Why are chains subject to stretching?
In fact, every owner of a suburban home has a chainsaw. And one does not even have to talk about the inhabitants of the countryside: such an instrument is an urgent need for them. And asks the chainsaw to take care of himself and timely service. All service rules are correctly spelled out in the annotation.
The saw set should include several chains (minimum 3) plus 2 tires. After 3 hours of operation, it is recommended to turn the tire. After another 3 hours, the chain is replaced. Such ordinary rules can significantly extend the life of all parts of the chainsaw. And in life, we actually do not adhere to advice and are guided by our ideas about the need.
Comparison table of features of chain chainsaws.
After a certain working time of the chainsaw, we simply tighten the chain. Carburetor on a chainsaw in a husqvarna 262 chainsaw chain on a tire. Changed the chain. And at a certain moment we notice that the tension system does not allow to tighten the chain. The chain stretched to the maximum. You can’t continue working with it, because the extended chain will begin to break the driven sprocket, as a result of which tire wear will increase very much. The chain needs to be shortened.
Another reason that you have to shorten the chain is to “fit” a longer chain from another chainsaw to your tire. This also often occurs, because among users there is a worldview that for "professional" chainsaws higher-quality chains are made.
Chainsaw manufacturers say that it is unrealistic to shorten the chain in home conditions, because the development of their production itself is very complicated and requires high-precision equipment. Practice indicates that there is nothing impracticable. In order to shorten the chain, you will need:
- electric welding machine (in some cases it is possible to do without it).
How to remove rivets?
The main characteristics of the chainsaw chain.
The chainsaw chain is difficult to disconnect. The rivets are made of stainless steel and have a geometric shape that does not allow just to knock the rivets out of the link. The inside of the rivet has a larger radius. At this thickening, the link rotates, and the outer parts of the rivets carry only a connecting function, because it is quite easy to fix them firmly on the outside of the chain. Removing the rivet is done as follows: the chain is fixed in a vise, and the seaming of the protruding part is done. When grinding, we try not to destroy the side parts of the links.
It is not recommended to use an angle grinder, as the parts heat up very rapidly, which will lead to a change in the physical parameters of the metal. It is better to use rattle or needle file for grinding. Stitching is done on both sides of the link. And now the rivets can be knocked out of the chain with a beard, slightly bending the side parts of the links.
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The chain came out to disconnect. Do not rush to remove the rivet from the chain. It may be that you cannot find her a suitable substitute. Chainsaw manufacturers do not imply that independent chain repair will be carried out, therefore, such rivets are not marketed.
Scheme of the tooth chainsaw.
It is also profitable for trading organizations to sell chains in their finished form than small repair parts. For obvious reasons, it will be very difficult to find a suitable rivet with a suitable geometry. Making it at home will be even harder, because you have to use an old rivet.
As you may have thought, the chain of the chainsaw will have to be disconnected twice. Do not forget to calculate with all this, so that the number of guide protrusions on the inside of the chain and the distance between these protrusions are combined with the leading chain saw sprocket. If you shorten the unusual chain, then this is not necessary. And if this is a chain from another model of a chainsaw, then everything needs to be measured and calculated very well. Deviation in the chain pitch (even small) from the characteristics given by the construction will result in the chain being again stretched in the shortest possible time (in the best case) or breaking the chainsaw sprocket. The tire will come to an end, as the driven sprocket will rapidly overheat.
Video: How to Remove a Chain Drive on a Chainsaw
Chinese chainsaw how to shorten the chain.
How can I shorten chainsaw.
Riveted and riveted a chainsaw chain
riveted and riveted chain using yews.
If all the parameters of the chain are combined with the details of your chainsaw, then you can start linking the links. We connect the links to the rivet, tightly pressing their side parts. It is no longer possible to unfasten the protrusions, since they are stitched flush with the links. Have to use electric welding. The electrode for this must be taken to the smallest diameter.
Determination of chain wear: a. tooth wear, b. installation of an additional locking plate on the locking link.
It is not recommended to start welding immediately, as this is a very delicate job. Practice first doing this on other details. So you will at least approximately understand at what current it is necessary to cook and what welding time to choose. And the electrode will become shorter, which will allow for more accurate welding. After all, a very short period of time is enough to “grab” a rivet. After training, we weld the rivets with the side parts of the link. It remains only to file off excess metal on both sides with a file and the chain can be considered ready for use.
Negative consequences of improper circuit repair
The considered option for repairing the chain is not the most reliable, since no one guarantees you the high quality of the final product. The following consequences of such repairs are possible:
File chain sharpening chain chainsaw.
- During welding (especially with a small current), excessive heating of the circuit elements was made, which caused a change in the physical properties of the metal. Soft metal will allow the chain to stretch not along its entire length, but at the weld point. The chain guides will shift, and other elements of the chainsaw (sprocket, tire) will quickly fail.
- Depth of welding more than planned. The inner part of the rivet was welded to one (or several) parts of the link, which became a violation of the mobility of the links. How to replace a tire and chain on a chainsaw. Dmitry Pushkar. We pull the chain of the chainsaw. right. The consequences will be the same as those described in the first case.
- The welding quality is poor. In this case, a circuit breakdown may occur during its operation. The fact is that the circuit undergoes very high lateral loads, so unreliable welding quickly "develops". The possibility of injury will be very high.
Contact an experienced welder
The question may arise about the advisability of repairing the chainsaw chain, since the consequences of its repair can be so serious. But all this is only due to inept welding. An experienced welder will do this job quickly and efficiently, which will reduce the likelihood of negative consequences to almost zero. And when using rivets without subsequent welding, the previously mentioned moments simply disappear. The only question is where to get such rivets. But to make them is not so difficult if you have a lathe in stock.
How to make the right rivets with an electric drill?
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Chainsaw chain structure.
Do not be afraid: nobody offers you to buy a machine. Use an ordinary drill. The entire process of manufacturing rivets using an electric drill and a usual file is described as follows. From a nail whose diameter is equal to the diameter of the inner part of the rivets (we check with a caliper), a workpiece is cut. a piece about 7 cm long. This workpiece is fixed in the head of the electric drill. The drill itself must also be securely locked.
Two files are fixed on a wooden beam, the distance between which will be equal to the width of the inner part of the rivet. It may not work out quickly, but you must achieve absolute accuracy. How to replace the chain and tire on a chainsaw. Video. It remains only to organize a uniform supply of the bar to the workpiece. We recommend using a piece of the board, one end of which is fixed to the fixed part of the workbench using a wide door hinge, and on the second end of the board we fix a bar with files.
Check the perpendicularity of the location of the files and the workpiece. and you can get to work. We turn on the electric drill and slowly lower the files. They will make grooves on the workpiece. Making rivets at one time is not recommended, since it is not worth overheating the metal, but it is necessary to control the thickness of the workpiece on the machined part. A too thin part of the rivet can also hurt you, so you need to achieve maximum accuracy. If you were able to do everything right, all that remains is to cut off the rivet and use it to connect the chain links.
It is better to cut the rivet manually, without using an angle grinder. Do not forget that when cutting metal at high tool speeds, a significant increase in material temperature will occur, which is very undesirable. The finished rivet is in no way inferior to the factory product in quality, so the restored chain will last a long time. Negative moments when using homemade rivets will be practically eliminated. The main thing is that when you install the rivets you do not forget to align the side parts of the links (they had to be unbent when the chain was split). Even a slight protrusion of these elements from the design norm will lead to premature wear of the drive sprocket.
It is recommended to immediately make several rivets as previously described. The point here is not only to stock up on such necessary elements for the future (although this is also important). It is more important from the total number of products to choose the most suitable in size: any deviation from the norm will make the chain vulnerable to high loads.
The use of reconditioned chains is not recommended when working with dense wood.
Why are chains subject to stretching?
This is due to the fact that the oil supply to the driven sprocket is not adjusted. It may happen that the hole for the oil supply is blocked or the adjustment is incorrect. A chainsaw needs periodic maintenance and adjustment.
The chains also stretch due to wear on the drive sprocket. It turns out that on the worn sprocket there is a slip of the guide protrusions. Parts with such friction undergo heating very quickly, hence the reason for chain stretching. In practice, the same thing happens with a low chain tension. The conclusion suggests itself: you need to replace the drive sprocket, chainsaw tires, and adjust all elements. Otherwise, the problem will only worsen: the chainsaw will begin to work jerkily, the chains will continue to stretch, the engine will fail (with a very high probability).
And we also note that when working with a chainsaw, it is necessary to use protective equipment.
This is especially true if you are using a recovery circuit.
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How To Remove A Link From A Chainsaw Chain
Electrical equipment, light, lighting
Completely all owners of chainsaws at some point encounter a need sharpening chain. This problem can be solved by two methods. give chain to the workshop, or do your own chain sharpening for a chainsaw. Everything is clear with the first solution, but sometimes contacting a service center is impossible. for example, chain dull when working in the country, from which hundreds of kilometers to the nearest workshop. In this case, you have to cope on your own. Let’s talk about how to sharpen chain gasoline saw.
Table of contents:
Need for sharpening a saw
Sharpening procedure chainsaw chains. no more complicated than the process of sharpening any cutting tool in the presence of special devices. The tooth of a chainsaw has complex geometry. The side and top cutting edges, the second of which is beveled towards the line of movement of the chain at a certain angle, make this operation difficult.
To a large extent, the high performance of the chainsaw is affected by the correct use of its chain, which must be sharp and sharpened beforehand. This is the only way to ensure efficient and safe operation during its application. After all, correctly sharpened chain chainsaws are more important than a powerful engine. Turning the saw needs to be done after its blunting, which consists in slow operation, also the machine leads to the sides.
Intensive operation of the chainsaw provokes rapid blunting of the chain. Sometimes during the day, several sharpening may be required. The problem is aggravated by the fact that the teeth quickly become blunt when they meet the ground. Even if you hook the soil once or twice with a tire, you can stop working. the chips will become shallow and the saw will no longer go deep into the wood. The earlier blunted teeth are sharpened, the less material needs to be removed during sharpening, as a result. the useful life of the saw chain becomes longer.
When to sharpen a saw
Unfortunately, chain sharpening for a chainsaw in many cases is not done on time. users simply do not notice signs that indicate that the chain has become blunt. Do not cut with a defective saw or blunt chain, resulting in poor cutting results, high cyclic load, high fuel consumption, destruction of the drive sprocket and tire. This, in turn, leads to a decrease in productivity, an increase in the wear of all components of the chainsaw and a decrease in the useful life of the chainsaw.
To avoid such problems, pay attention to the appearance of the chips during operation. By the state of the chips, it will be possible to determine when to sharpen chain. If it gets darker than before, this is a clear sign that chain requires sharpening. Dull chain you will be able to recognize if only small shavings fly out of the cut instead of a large thick one. At the same time, a lot of dust occurs in the chips, and it looks like needles.
Simply determine the moment when sharpening is needed. An important sign is the feed force. The target, sharpened correctly, is drawn into the cut even with small presses. If, on the contrary, the chainsaw is forced to saw by increasing the feed force, then the teeth are dull.
Take a close look at the teeth of the chain. dullness in many cases can be seen with the naked eye. The need for sharpening chainsaw chains You can determine Stihl by a reduced level of productivity. it’s harder to cut, and the work takes more time from the user.
Cutting link The chain of a gas-powered saw consists of: a tooth blade, a link base and a depth limiter. The blade of the clove has an end blade that is located vertically, and a falling down upper blade, placed horizontally.
To achieve optimal cutting properties, it is necessary to give the tooth blades certain angles. The back of the tooth, which falls back at an angle, forms the angle of the upper blade, which is required for cutting the upper blade into the wood. The tooth blade, which tapers back, forms the angle of the end blade, necessary for side cutting of the chips flying from under the chainsaw.
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The edge of the end blade with the sliding surface of the links forms a rake angle, which varies for different chains from 60 to 85 degrees. The backward inclination of the upper blade is measured in accordance with the plane of sliding of the link and depending on the type of the saw chain, and reaches 50-60 degrees. The upper blade is the main blade, and the angle of the upper blade is the most important angle. The angle of the upper blade is difficult to measure, its correct value is possible if all the values indicated above are observed.
You can angle sharpening chain Chainsaws vary depending on the application. The main rule: the larger the sharpening angle, the higher the cutting performance when sawing soft, unfrozen wood. When sawing hard and frozen wood, a reduction in the angle of sharpening helps to reduce vibration and smooth the saw. But remember that the angle of sharpening should not be more than 35 and less than 25 degrees. The exception is chains intended for longitudinal cutting, this angle is 10 °.
The angle of the upper blade, the angle of sharpening and the rake angle change when sharpening. Similar criteria have a decisive influence on the cutting ability of the chain. In front of the tooth blade on each link is a depth limiter. Differences in height between the edge of the back of the tooth and the edge of the depth gauge is defined as the distance of the depth gauge.
The level of cutting the upper blade into the wood (chip thickness) depends on this indicator and therefore on productivity. Set the distance of the depth gauge depending on the type of execution and the pitch of the chain. It should be in the norm of 0.5-0.8 millimeters, most often. 0.6 millimeters.
Chinese chainsaw,how to shorten chain.
How can I shorten chain on the chainsaw.
Riveted and riveted chain chainsaws
riveted and riveted chain using yews.
Higher values cause the chainsaw to be more prone to kickback, chain vibration and too much grip. Low values cause a drop in performance. Since with each sharpening of a chainsaw, the distance of the depth gauge falls due to a decrease in the upper edge of the tooth, the depth gauge also requires periodic sawing. after ten sharpenings.
General sharpening rules
Correct sharpening chainsaw chains needs to comply with several recommendations. Before sharpening the chain, it is strongly recommended to pay attention to them. The sharpness of the cutting angle and the height of the cutter limiter must meet the criteria established by the manufacturers. In addition, it is important that the dimensions of all links of the same chain are identical. Otherwise, productivity may decrease, and the level of vibration and engine load may increase. Due to uneven loads, the likelihood of an open circuit increases.
Since the inner contour of the tooth is close in shape to the circumference, and the material of the chain is quite soft, chain it is customary to sharpen with a round file, which has a small diameter. Sharpening a chainsaw needs precise positioning of the file relative to the sharpened tooth.
The upper edge of the file should protrude above the upper edge of the clove approximately 1/5 of the diameter of the file. Immediately before sharpening the chain of a gasoline-powered saw, it is recommended to find out its parameters, it is recommended to choose the file diameter depending on the chain pitch. It ranges usually in the range of 4-5.5 millimeters.
On video sharpening chainsaw chains it can be seen that the file must be placed at right angles in the vertical plane to the chain and 10 or 30 degrees in the horizontal. To fulfill all these conditions with just one file is quite difficult, therefore, you can use different tools for sharpening the chainsaw, which allows you to provide the necessary sharpening parameters. They are sets that are bundled with gasoline powered saws, or bought at any builder
change, replace, replace the lead, unscrew
The chainsaw sprocket is used to transmit engine torque through a centrifugal clutch to the saw chain. Sprocket teeth experience heavy loads during operation and therefore wear out gradually. It is easy to remove the sprocket from the chainsaw using a special tool, but you can do the work with improvised tools.
Design Features and Functions
The chain sprocket is functionally aligned with the clutch drum, inside of which there are cams compressed by a spring. A feature of the design device is that the engine shaft passes and rotates freely inside the clutch drum. Expanding cams are rigidly fixed at the end of the shaft.
When idling, the spring compresses the cams and they do not touch the drum. With increasing revolutions, the centrifugal force exceeds the stiffness of the spring and the cams come into contact with the walls of the drum. The latter begins to spin.
The teeth of the chain are meshed with the teeth of the drive sprocket. One of the functions of automatic centrifugal clutch is to protect the engine when the load on the circuit increases beyond the permissible limit. This may occur when the chain is jammed.
The outer part of the drum is covered by an emergency brake belt. When the handle is tilted, the tape is pressed against the drum and slows down its rotation. The effect is the same as when jamming the chain.
A feature of all chainsaws. the drum and clutch cams are mounted on the shaft with a nut with a left-hand thread, so that the mechanism does not unwind during operation.
Causes of malfunctions and how to determine the need for replacement
The wear of the teeth of the drive sprocket can occur for several reasons:
- natural wear together in the teeth of the chain;
- accelerated wear as a result of excessive tension or lack of chain lubrication;
- incorrectly selected chain;
- technological defect.
Metal wear can be determined visually when inspecting the sprocket without removing it from the saw. Dents and chips on the surface should not exceed 0.5 mm.
The need for replacement is determined by the increased noise during the movement of the chain, but this is characteristic only in the presence of deep potholes. Shallow production during operation is difficult to notice, but the chain will wear out a lot. When the teeth are broken, the chain can move in jerks, which is especially felt during operation.
How to remove an asterisk on a chainsaw
You can remove and change the asterisk at home, without resorting to the services of a service center. The procedure is as follows:
- we unscrew the mount of the saw set with a special key;
- unscrew and remove the headset cover;
- unscrew and remove the air filter cover and the filter itself;
- unscrew the spark plug.
To remove the sprocket, you need to fix the engine piston. To do this, gently pull the kick starter cord, lifting the piston up, but not bringing it to the end. We push a long section of a thick cord into the candle hole until the combustion chamber space is filled. This is necessary in order to prevent the piston from reaching top dead center. At the same time, the cord will serve as a damper, protecting the piston from possible damage. Part of the cord should come out of the hole so that it can then be removed.
To unscrew the sprocket, you need a special key, which rarely comes with a set of saws, especially cheap models. It is necessary to use a drift of soft metal. copper or aluminum.
The drift is leaned against the protrusions of the cams of the centrifugal mechanism and inflicted light blows with a hammer. The direction of impact should be almost parallel to the plane of the coupling, since with a large angle you can bend the cam mount and the clutch will have to be changed. The direction of impact is counterclockwise. Often the clutch is labeled “off” and an arrow showing the direction of impact.
Do not use steel drifts or a chisel, as there is a high risk of damage to the clutch.
After loosening the nut from its place, you can unscrew it by hand.
Some saw manufacturers use simple left-handed nuts to secure the clutch and sprockets. Then the task is simplified, because for removal you can take a simple open-end wrench of the right size.
Now remove the drive sprocket, being careful not to lose the plastic gear of the oil pump drive and the needle bearing.
How to install
After all the work is completed, the asterisk can be replaced with a working one. Assemble in the reverse order. Grease the needle bearing further.
When tightening the nut, there is no need to apply great efforts, since it will be tightened during operation.
How much is an asterisk and its replacement
The price of an asterisk for a chainsaw is highly dependent on the manufacturer and slightly lower than the cost of the saw chain. In order not to make a regular replacement, manufacturers recommend operating a saw with several chains and periodically changing their places. In this case, the wear of the sprocket teeth occurs more uniformly.
The replacement cost in service centers is commensurate with the price of the part itself, so it makes sense to do this work yourself, especially since no adjustments are necessary after that.
how to remove and change with your own hands
Gasoline chain saws, like most other tools, require periodic breakdown diagnostics and replacement of worn parts. A significant part of them are connected with a leading chain saw for a chainsaw or clutch disc. one of the important elements of all chainsaws without exception. Despite the relative simplicity of its design and the hints of the operating instructions, every year thousands of inexperienced craftsmen come to a standstill in this matter and spend money on service centers or do it wrong, which further aggravates the problem.
That is why we will dwell on this topic and understand the structure, functional features and repair of this working node of chainsaws.
Chainsaw sprocket device
An asterisk or centrifugal mechanism is a part resembling a star in shape. It takes over the engine torque and transfers it to the guide and saw chain. This guarantees the rotation of the cutting headset and the cutting process itself. It works in automatic mode, which depends on the magnitude of the engine speed.
The clutch drum can be localized both outside the chainsaw and on its inside under a separate cover. It performs a protective function not only in relation to the material of which the sprocket is made, but also for the operator, who may be injured by it during operation.
In addition to the function of chain rotation, the leading star of the saw prevents the appearance of malfunctions of the motor system in those cases when the chain is jammed or stops rotating.
Classification of the leading chain saw chains
In accordance with the power class of the saws on which they are installed, the asterisk can be:
The main difference between them is the frequency of replacement and the rate of wear: in the Pro series, wear is faster and repairs are more frequent.
By design features, the leading chain saw stars are:
The latter consist of a hub with a stationary crown of a certain number of teeth. Their factory fitting does not allow to remove the crown separately from the hub. This situation is typical for many Chinese chainsaws, for example, from the Champion brand.
The situation with prefabricated sprockets is simpler: a removable crown quickly unscrews from the axis of the drum, so repair is not particularly difficult. This option is the advantage of most saws of European origin, for example, “Stihl” or “Husqvarna”.
When to change the chainsaw sprocket?
If the chain glues at low speeds, the saw is operated for a long time on the same chain and drive sprocket, and defects are detected during its inspection, its change is mandatory.
Externally, the state of the sprocket is determined by its teeth. They are considered worn out if:
- there are small chips or grooves from the guide;
- their width is disproportionate to height;
- the angles between the teeth and troughs are different;
- hub with seizures and other deformations due to lack of lubrication.
In each of the options described above. an asterisk is subject to repair.
What is needed to replace the sprocket on a chainsaw?
The main thing that is required is an understanding of the internal structure of the saws and a certain dexterity: if you are holding this power tool for the first time, it is better not to experiment with repairs and provide it to more experienced people.
If you are confident in your own technical literacy, to replace the sprocket on a chainsaw, you will need:
- a new clutch drum or its whisk. are selected in accordance with the model of a particular chainsaw;
- set of tools for repair.
How to remove an asterisk from a chainsaw: several options for different designs of the clutch drum
The method for a star with a stationary crown
To do this, produce:
- dismantling the protective cover and tire-cutting headset;
- locking of the piston of the motor;
- disconnecting the clutch from the motor system;
- recess from the saw body of the clutch and the centrifugal sprocket;
- visual inspection of the sprocket and its gear part;
- if defects are detected, replace the sprocket with a new clutch drum;
- diagnostics of clutch chainsaw elements for defects. worn centrifugal springs and cams can adversely affect the operation of the sprocket;
- if there are no malfunctions, we proceed to the assembly stage. To do this, you need:
- remove the stopper;
- to pull off the ignition cable;
- screw the stop to fix the centrifugal mechanism on the motor shaft;
- use a universal key in the direction against the chain stroke to tighten the clutch;
- return the remaining removed parts to their previous positions.
Method for star with collapsible clutch drum
The second method regarding how to unscrew the sprocket on a chainsaw with a collapsible clutch drum looks simpler than the previous one. The sequence of actions will be similar, but not the entire star will be subject to disassembly and reinstallation, but only a separate part of it. the ring gear.
Do not forget that the installation of a new chain on the tire chainsaw is one of the reasons to re-equip the saw with a new asterisk. Otherwise, the chain will stretch ahead of time or break during operation. Less wear on the clutch drum results in alternate use of several chains and periodic maintenance of its bearing. This mechanism is used exclusively at idle: with an increase in speed, it is not involved in the work. Experts recommend changing it simultaneously with a chain and an asterisk and systematically lubricating it with chain oil.