Chainsaw - very useful thing in the economy. After all, with it, a lot of tasks of home construction, gardening and landscaping are quickly and relatively easily solved. Chainsaws are a rather capricious tool, but with proper handling it is an indispensable assistant. who has one vulnerable spot: guide bar. It accounts for most of the operational loads. And this means that knowing why tires fail more often than other parts of chainsaws and how to replace them correctly if necessary will help you save more than once. cash and time for seasonal or project work with the tool.
Chainsaw bar mount
The tire and its fastening elements are consumable parts. The wear of this unit occurs both under workloads and as a result of improper operation. You will immediately determine the presence of malfunctions in this area. The tire will not be able to provide normal tension, lubrication and smooth running of the chain, and its fastening will not be able to fix the cutting axis relative to the tool body.
It is not safe to operate a saw with a broken bar. Therefore, at the first sign of a breakdown of the unit, you need to turn off the engine and find out what's wrong. Knowing the design features of the tire and its mounting on your chainsaw will help to successfully eliminate the cause of the malfunction.
The bar determines the axis and length of the cut by guiding the chain. But the basis of the mechanism is still fastening. It is installed in the groove between the inner plate on the motor housing and the outer plate located on the casing of the chain set. The tire and casing are fixed with a bolted connection. This part of the mount is called the "motor assembly", and its shape and design depend on the chainsaw model. The tire mounting and the drive sprocket are closed with a separate cover.
The saw chain drive links are mounted in a guide groove on the edge of the bar and are engaged with a drive sprocket connected to the power take-off shaft. When the fixing bolts are loosened, the tire can move. The chain tension can be adjusted manually or, like on professional chainsaws, automatically. Finally, a stop is located in front of the tire mount. It serves to securely fix the cutting axis when the moving chain contacts the tree.
A serviceable tire should provide normal chain tension. To check it, you need to release the chain brake and pull the chain by hand in the direction of its movement. If the chain does not move, then the fastener is too tight. It must be slightly released, and then again check the free play of the chain.
Weak points of the saw bar
The main parts of the tire are the body and the groove. The width of the latter is called the gap. The front part of the saw bars is made of high-strength steel. The tire body is also hardened.
Currently on sale different types saw bars, which differ in:
- body length and width;
- gap size;
- the presence of a nozzle of increased strength on the front;
- the presence and type of driven sprocket hidden in the front of the tire body.
The shape of the shank and the location of the technological holes in the tires for most amateur and professional chainsaws are standard, but structurally they can be divided into open and closed. It is obvious that the first ones are inferior to the second ones in terms of reliability of fastening to the case; the tire casing and the bolted connection are subjected to increased loads. You also need to monitor the integrity of the sprocket teeth - if it becomes dull or chipped, it will quickly render the leading links of the chain unusable.
Parameters and options for the execution of chainsaw tires and their elements in the photo
Chainsaw tire needs regular care. After each session of work, its grooves must be cleaned of dirt and sawdust, otherwise the lubricant will not flow to the chain. The wear of the groove of the tire should be even, so it should be turned over from time to time. In addition, before starting work, always check the presence of oil on the body of the chain and in the gap.
More than three chain sets with one bar are not recommended. During operation, the gap, despite all the strength of the metal of the tire body, expands, which leads to the appearance of play when the chain moves and its sagging even at the extreme forward position of the tire.
The driven sprocket located at the front of the tire is lubricated separately. Oil does not get there, unlike the rest of the guide groove. It is poured into special holes in the front of the tire, and if there is no asterisk, it is applied to the toe of the tire.
Replacing the chainsaw tire and its fastening elements
To replace the fastening elements, the bar and the chain set, it is necessary to disassemble the entire fastening mechanism. It does not hurt to prepare a rectangular piece of fabric or cardboard in advance, as well as free place on the table for disassembling the tool and temporarily placing the removed parts.
Replacing the fasteners and chainsaw tires is necessary when:
- Critical wear of the landing groove or shank elements.
- Casing damage.
- Violation of the fastening bolts.
- Damage or deformation of the tire body.
- Abrasion or breakage of the teeth of the drive and driven sprocket.
- Damage to the grooves for supplying lubrication to the chain.
- Worn chain tensioner.
- Wear of the mounting groove and tire retainer.
That's why the guide bar and fasteners are consumable parts - you only need one to replace them. universal key supplied with the tool. And, of course, knowledge of the algorithm for disassembling, assembling and adjusting the mechanism.
To disassemble the tire mount:
- put the engine vertically and, having unscrewed the corresponding nuts, remove the cover of the drive sprocket;
- lift the bar by the front end and turn the chain clamping screw, releasing it from the bar groove;
- pull the chain from below and, turning the clamping screw, release it from the groove;
- remove the chain from the drive sprocket and pull it out from under the casing, then set it aside;
- in the presence of damage or signs of wear, the casing and fastening gaskets should be replaced;
- remove the chain bar to be repaired or replaced from the groove.
The sequence of actions when removing the chainsaw tire in the photo
After that, the chain must be put on a new tire and install the latter in the groove being installed. Next, the headset is engaged with the drive sprocket and closed with a lid. Just before starting work, do not forget to check the absence of slack in the chain and the quality of its tension.
If the fastening of the new tire and the installation of the headset are done correctly, the chainsaw is ready to work again. By the way, just in case, you should make sure of this by sawing a few thin branches.
Do-it-yourself chainsaw tire and chainsaw replacement, video
Household, semi-professional and professional manual chainsaw equipment, regardless of cost and performance characteristics has an identical design. The cutting headset, which includes a chainsaw tire, belongs to the category of replacement equipment.
The decision which tire to put on the chainsaw is made by the owner, taking into account many factors. First of all, this is the compatibility of the seat and lubrication channels in working area, engine power, specifics of the forthcoming work.
specific assistance in self-selection Tires can provide expert advice or instructions for use information.
In particular, a long saw set is preferable for felling and sawing trees of large diameter, a short one is for trimming trees and preparing for installation. building timber.
AT standard solution, the longitudinal tire for the chainsaw is a part of an elongated oval configuration made of high-quality steel.
At one end there are holes for threaded fasteners, at the other end of the long tires a driven sprocket is installed. Such a tire device contributes to the smooth running of the chain and reduces the load on the engine.
A groove is made along the perimeter of the tire, into which the saw chain shanks are inserted. Through special drillings for cooling and lubricating the headset, chain oil is supplied in a metered amount to the working area.
Dimensional characteristics
The guide groove of the chainsaw tire of the household category has a width of 1.1 or 1.3 mm. The same indicator for professional models is 1.5-1.6 mm. A discrepancy between the thickness of the chain shank and the width of the groove can initiate overheating of the headset and its early failure. In another embodiment, the chain may exit the groove or break.
Similar consequences can occur if the chain pitch and the crown of the drive mechanism do not match. In many chainsaw models, replacing the drive sprocket involves time-consuming dismantling of the clutch assembly. In some cases, equipment of a service and repair level is required.
The most popular sprocket and saw chain pitch for saws up to 3 hp. - 0.325 inches. For professional chainsaw technology, the use of a 3/8-inch pitch is typical.
The driven sprocket of the tire is not centrally lubricated. This shortcoming is compensated high quality bearing, which must be greased every 8-10 hours of operation. A complete replacement of the driven tire sprocket is possible only in an equipped workshop.
Tire selection criteria for quality characteristics
Tires unified by landing dimensions are presented in a small assortment. As a rule, each manufacturer uses its own standards, which excludes the possibility of using a chainsaw with sawing equipment from other brands.
- The selling price of guide bars is determined by the size, material quality and brand awareness. The most expensive, highest quality and most durable products from leading manufacturers.
- The high cost of branded tires is fully offset by high wear resistance and long service life.
- In the middle price range - a range of tires of a budget level, which are equipped with gasoline and electric saws of a household class. With proper operation and qualified maintenance, tires of the Standard category develop a resource designated by the manufacturer with a large excess.
Less popular are cheap, short-lived Chinese-made tires that are installed on chainsaws of the minimum price range. A significant part of these products is sold under trademarks famous brands.
How to eliminate the possible risks of acquiring counterfeit tires?
The information field provides signs by which it is easy to distinguish the original branded chainsaw from the most reliable fake. As for tires, their advantages and disadvantages are manifested directly in operation.
In the domestic market household appliances about 15% of the total sales of chainsaw components is third-rate counterfeit of unknown origin, which produces a standard resource at best by half.
It is uneconomical and unsafe to operate a chainsaw complete with a fake tire and chain. A significant part of traumatic situations is created when using tire and chain falsification.
You can buy a high-quality and durable branded tire of the desired model, without significant risks, in a branded point of sale or representative of a licensed dealer company. In the absence of such an opportunity, you should use the services of a reputable online store that has earned the trust of buyers.
Leaders in consumer demand
In the process of natural selection, the first lines of the sales ratings were taken by the products of the leading European and Asian manufacturers of chainsaw equipment. Maximum demand for components trademarks Calm, Husqvarna, Makita, and a number of others.
Design features of household and professional tires
The design of modern saw sets is constantly being improved. As a result of partial modernization, the so-called narrow tire was developed.
Structurally, such models differ in the shape of the tip, which prevents kickback when the headset enters the cut. Most household chainsaws are equipped with narrow tires. Wide toe is salient feature tires designed for sawing work of increased complexity, as well as professional category chainsaws.
Selection of bar length according to drive power
The length of the new guide bar is determined by the power and torque ratio of the power unit.
- Models of chainsaws of small and medium power range are equipped with tires from 30 to 40 cm long.
- Longer saw sets create excessive loads on the motor and kinematics of the tool, which adversely affect its traction and durability.
- The enclosed application guide shows the recommended length of the guide bar. This means that the installation of a shorter headset is not ruled out, but there are a number of restrictions on the operation of the tool with an extended bar.
Chainsaw technology professional level equipped with power units, the power of which allows you to take advantage of tires up to 75 cm long. Often the size of the tire in centimeters and inches is applied to its lateral plane.
Recommendations for extending the service life
The approximate service life of a branded tire is equal to the total resource of 3 quality saw chains, the drive sprocket changes according to the state. Experts recommend using a set of several chains in your work.
This method allows you to reduce the loss of working time that is spent on periodic, as well as optimize the wear of the saw mechanism as a whole. Accelerated tire wear is a consequence of unskilled maintenance of the chainsaw and its illiterate operation.
The main factors of early tire failure:
- initiating the rapid development of the groove and shanks, excessive or inconsistency of its step with the characteristics of the crown of the drive sprocket;
- the application of considerable effort when sawing hard or frozen wood;
- the tire heats up and wears out intensively due to lack of lubrication, due to a malfunction or incorrect adjustment of the regular oil pump;
- savings on the use of low-quality or oil surrogates such as mining.
The forced consumption of the saw set resource occurs when soil or sand gets into it, the operation of a new chain on a worn crown of the drive sprocket.
Bar and chain installation
The tire is dismantled to clean the oil line, check technical condition or replacement. The sequence of work is described in the instruction manual. Upon completion of the installation, make sure that there is no play and that the threaded fasteners are tightened.
With the right skills, it only takes a few minutes to dismantle and install a new or re-sharpened chain. The technology prescribes the inclusion of an unauthorized start blocking and, in some cases, an emergency stop mechanism.
- Depending on the design tensioner, the chain is loosened to the desired degree by turning the adjusting screw or installation disk, until the shanks come out freely from the groove of the guide bar.
- After checking the direction of rotation, the shanks of the new chain are inserted into the guide groove and onto the crown of the drive sprocket. The tension is made in reverse order.
- To check the degree of tension, it is enough to pull the chain in the middle of the bar. The output of the link shank in this place should not exceed 2/3 of its height. A properly tensioned chain should move along the bar with little effort.
After installing and adjusting the saw set, it is advisable to start the engine and keep the saw at medium speed for several minutes. During this time, you can check the operation of the lubrication system.
After turning off the power unit, it is necessary to turn on the start blocking and check the headset for local overheating of the tire and changes in the degree of chain tension.
Causes of an uneven cut
In amateur chainsaw practice, many questions arise related to the departure of the cut in one direction or another. Such a malfunction creates significant inconvenience when using a chainsaw in technologies wooden construction.
The reason for this phenomenon is the deformation of the tire, which is hardly noticeable to the eye, improper sharpening or uneven wear of the cutting chain links. If professional fine-tuning of the chain did not give a positive result, the problem is eliminated by replacing the entire kit.
Somehow I got a new Oregon chain on a Husqvarna-140. It's a good thing, I decided, and removed it until better times. And when it came time to change the old one, it turned out that the chain did not fit on the chainsaw, although it corresponded to the previous one in all respects. On the same occasion as the chain, I also got a new 16” bar. With this tire and chain, I rushed to the store, hoping with the help of experienced sellers to figure out what was what ...
Understood. It turned out that on the hands was a shortened chain for a chainsaw.
The new chain has 55 teeth, while the old chain has 56. And its length is not enough to be thrown over the tire sprocket. The seller said that there is a kind of tire for such chains and, of course, they are not currently on sale. When asked what to do, he suggested adapting the old tire for the new chain on his own. Those. Requires minor modification to the chainsaw bar. There it’s business for 5 minutes - cut off the back a little so that the tire, without resting on the sprocket, rolls back a distance sufficient to put on a shortened chain.
On the very first fine day, I gather myself, a saw and a grinder in one place
Using the utility wrench that came with the saw, I remove the cover to fit the new chain to the old bar, and I realize that simply cutting the tail will not be enough.
The photographs clearly show that the length longitudinal groove on a tire with a shortened chain, it is also not enough, which means that it will have to be lengthened. I marked with a red marker what would need to be removed on the tire.
In principle, indeed, it took a little more than five minutes, and then because after the grinder I decided to smooth the edge a little with a file
Already anticipating the increased productivity of the saw with the new chain, I put everything in its place. I won’t say that it’s easy, but the tire becomes, and the chain is put on and scrolls freely. But when I try to put the cover in place, I stumble upon another “surprise” - even the chain tensioner finger, taken to the extreme left position, does not reach its groove in the tire.
Well, then you should make a new hole, a little closer. As they taught - first with a small diameter drill, then a larger diameter, small revolutions so as not to overheat the drill ...
The hole turned out to be neat and, no less surprising, even in the right place. Moreover, there is a power reserve.
In general, I assembled the saw, made sure that everything that should move ... moves, and without interference and friction, added chain oil, fuel mixture and started my Husqvarna. Nothing unusual happened - the saw wound up easily and just as easily (40.9 cm ?, yes with new chain) dug into the trunk offered to her.
Great, you can use firewood.
A chainsaw is a necessary thing in the household and gardening, helping to quickly and efficiently perform various work with a tree. Like any electrical device, it periodically fails and requires diagnostics. The result of the latter event is often the conclusion that it is necessary to repair the chainsaw tire - a mechanism that experiences during operation most loads.
Device and principle of operation
For independent troubleshooting, the owner will need a good knowledge of the chainsaw device. This is a device powered by a single cylinder internal combustion engine. The fuel liquid is gasoline. The saw mechanism is driven by a single-stage chain drive, for safety it closes the casing.
The main structural elements are an air purification system, a chain mechanism, an engine, a tensioner, ignition elements, a flywheel and a clutch. Lots of small parts connect the main nodes and contribute reliable operation devices.
The properties of the automatic centrifugal clutch depend on the number of revolutions of the power unit. A low rotation speed does not transfer rotation to the drum. Only when a high number of revolutions is reached, the centrifugal force exceeds the force of the springs, causing the drum to rotate. The chain and sprocket located in front are set in motion.
Faults and how to repair a tire
To repair a chainsaw with your own hands, you will need a detailed diagram and an understanding of the operation of the main mechanisms of the device. The guide bar and its fasteners are vulnerable, consumable parts that experience the greatest stress. You can repair the chainsaw tire yourself or by contacting service center. Wear and breakage in this area is indicated by the absence of normal tension, a sharp or intermittent chain movement, the inability to provide normal lubrication and fastening of the cutting axis in relation to the unit body. Types of breakdowns:
- The rear and front drive links are riveted. The reason is a discrepancy between the pitch of the sprocket and chain links, low tension or wear of the sprocket. The problem is solved by replacing or adjusting the mechanisms.
- The presence of broken or incomplete links indicates a weak tension or a broken chain.
- Rounded backs of spouts occur when the chain set is too long and there is a lack of oil.
How to sharpen
Periodic sharpening is an obligatory measure necessary for the normal operation of the gasoline device. Ways self-sharpening chains:
- Using a file is a simple and common option that allows you to conduct an event directly at the sawing site.
- The use of a special machine The method is found in personal households and service centers.
- With the help of a grinder. Sharpening requires skill.
Special machine - the most effective method. But with the help of a file, you can also achieve good results.
How to choose a tire
Choosing a tire is a responsible event, the result of which depends on the operation of the entire device. Installing an unsuitable element not only leads to failure of other parts, but is also unsafe for the operator. In order to correctly select the component, you will need data on the length, size, shape and parameters of the shank.
Installing a chain on a chainsaw, how to properly pull and check the tension
If you have a chainsaw at home, you should know that it requires special care. It is necessary to periodically clean and sharpen the chains, clean the air filter, oil supply and tires. And, of course, you need to watch the chain stretch, because with bad stretch, there is a risk not only to damage the saw, but also to your health if the chain flies off at high speed.
Functions of the chainsaw device
The main part of the gasoline saw engine. In most modern devices, the engine is single-cylinder. Air-cooled, two-stroke piston system. 
The oil in these types of engines is added directly to the gasoline because the fuel constantly washes the crankcase. The oil-gasoline ratio ranges from 1:20 to 1:50, depending on the chainsaw manufacturer.
The air filter on chainsaws plays an equally important role. He needs regular cleaning. If you allow the filter to get very dirty, dust from it will fall directly into piston system which will damage the engine.
If the filter is clogged, the saw will lose speed and the engine will start to overheat, which can cause the piston rings to burn.
Chainsaw starter. it is a rope with a handle, by pulling which you control the engine. When you pull the rope, the teeth catch on the ratchet and the flywheel starts to turn.
Many complain that it takes a long time to pull the rope to ignite the engine. It depends on whether the carburetor is positioned correctly. If the carburetor produces the correct mixture of oil and gasoline, then there are no problems.
Main working mechanism. clasp splint.
The chain consists of three types of teeth: leading, cutting and connecting. They are connected with rivets. The cutting teeth are located on two sides: on the right and on the left.
Chains are divided into two types: high profile and low profile. The first type includes clamps in which the teeth are located with a large gap, in the second. with less clearance. In addition, chains can vary in shank thickness and line length. 
The chainsaw chain is attached to a bar that guides it to the right side. The end of the bar has a specific groove that holds the links and allows the chain to rotate. There is a driven sprocket in front of the tire. A chain with a bar is called a headset because they are removable parts of a chainsaw.
The petrol saw has automatic system chain lubrication. The tire supplies oil, which then absorbs the sawdust. If the saw is idling, the oil supply stops.
Why the chain is flying, find out the reasons
Read also
If you have been wondering why the chain is flying off your chainsaw, then there are some problems in the mechanism. Exist three main reasons This fault: incorrect tire operation, chain lengthening and loosely fixed driven sprocket. We will discuss in detail each of possible causes failure.
Tire problems
When problems with the bus are almost always clinker tension is relaxed. Usually this problem occurs at the time of mounting the tire.
This space is located in the groove between the outer plate, which is located on the chain set housing, and the inner plate, located on the motor housing. The body with the tire is fixed with a bolt. This mount is called the "motor assembly". The drive sprocket and bar supports are protected by special covers.
If the locking bolts are loose, the tire will move or vibrate. If the tire is serviceable, then be normal. After stretching, she will spend a minimum of five working days without braces. Therefore, it is necessary to tighten the bolts that securely hold the tire.
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To understand how to pull the chain on a chainsaw, you first need find and release the chain brake. The tension screw is next to the bar, it is cranked until the chain is tensioned over the bar. Then pull the chain clockwise. If it does not move, it needs to be slightly loosened by turning the tension screw in the opposite direction.
Chain stretched
If the chain saw has a chain, this indicates a malfunction of some mechanism, one possibility is chain wear.
Over time, the metal is deformed and the chain becomes 0.5-1 cm longer. It is best to fix this problem, but there is a way to get the old one back to work. Experts say that it is very difficult and almost impossible, but we will tell you how you can do it at home.
For this we will be needed:
- vise;
- over-file;
- electric welding machine(not necessarily in all cases);
- a hammer;
- pliers;
- beards.
Ordinary chain saws made of strong steel, so they are difficult to separate. Disconnect the chain on the inside of the rivet that serves as the connecting mechanism.
To start, the chains must be fixed in a vise, and then gradually grind the protruding part. You need to shred the file or file. Bulgaria is not recommended because there is a risk of damage to the side parts of the links. After grinding, the rivets are knocked out with a beard. A broken rivet cannot be discarded. You may not be able to find a replacement for her. Chainsaw manufacturers do not manufacture individual parts for the chain, as they do not assume that consumers can repair the chain themselves. To make a new rivet yourself, you most likely won't succeed, so you'll have to install the old one.
To shorten a chain, you need to split it into two places. But remember that the number of guide lugs on the inside of the chain and the distance between them must match the drive sprocket.
Read also
After removing one or more links (depending on the degree of stretch of the chain) the chains can be connected. We connect with the old rivets, at the same time we press them tightly on the sides.
Then we need a welding machine. The rivet must be welded to the side parts of the line. After that, we remove the excess with a file that was formed during welding. The circuit can be considered operational.
Poorly fixed drive sprocket
One of options sagging on your device. problem with drive sprocket. Most often, everything happens because the star is poorly fixed. Now we will tell you how to properly fix the star, and then put the chain on the chainsaw.
First you need to remove the engine cover. Then remove the protective cover of the candle, pull out the air filter. Then you need to unscrew the candle with a special key. A special plug is placed in its place, which fixes the piston in a certain position. Using a special wrench (you can use a Bulgarian universal wrench), turn the clutch plate clockwise until the piston reaches its highest position. If you look into the spark plug hole, the piston should stay down. In the role of a cork, you can put a thick rope, it needs to be folded several times. Then you can clamp it by turning the clutch plate counterclockwise.
After clamping, you need to do everything in reverse order, that is, assemble the chainsaw. A chain is put on the tire, it must go to the drive sprocket, which holds it. The tire is placed in special holes for mounting and bolt. Then put on the protection.
How to Tighten: Installing a Chainsaw Cutter
We dismantled the main causes of chain sagging. How to install the chain on the chainsaw described in the paragraph above. Now you need to properly tighten the chain and check if it is tight. 
Circuit voltage
You can tighten the chain two ways: fast and frontal. It is best to stretch the frontal path.
If you are holding the front stretch then you need to unscrew the nuts holding the tire and lift it up over the edge. Using the special bolt on the right side, you need to tighten the chain to get an acceptable stretch, and then raise the bar even higher and clamp it.
If you are using the quick pull method, you first need to lift the wing nut knob and loosen it. Then tighten the chain tension screw clockwise until it stops. Then tighten the wing nut and lower the handle.
Check Stretch
To check chain tension, you must turn off brake system saws. Then manually hold the chain on the bar, if it goes smoothly and does not sag, then everything is in order. If the chain runs very tightly, then it must be loosened slightly, since there is a risk of breaking during operation.
It is not enough to know how the chain is pulled on a chainsaw. You need to properly care for the saw, then you prolong the life of not only the tenacious, but the entire mechanism. Here are some operating tips:
- Clean the air filter regularly and lubricate it with oil. If necessary, replace the filter with a new one.
- Before starting work, always check that all nuts and bolts are tightened so that there is no malfunction during work.
- Lubricate the bearings regularly and remember to clean the spark plug.
- Lubricate the driven sprocket. And after working with the chainsaw, don't forget to clean it.
- Lubricate, sharpen and tighten the chain always on time, then there will be no problems with the bar and chain.
If you use all the tips above, your device will last much longer than the warranty period.
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