How To Remove The Drive Sprocket On A Chainsaw

Table of Contents:

A little about the rules for operating the node

Regardless of the manufacturer’s brand (Stihl, Husqvarna, Partner, Patriot, Makita), chainsaws are divided into household, semi-professional and professional. The difference, however, is not the quality of the assembly or the manufacture of the components, but the class of tasks performed, the performance and the continuous power of the drive. This predetermines the choice of the material of the leading sprocket for the chainsaw, its design and the design of the saw chain.

The performance of the tool will depend on how the chain-sprocket pair is operated. In most cases, users use one of two options:

  • The chain is operated until the teeth are completely worn out, and then both the saw blade and the sprocket are replaced at the same time;
  • Periodic replacement of chains with different pitch, and each will require its own drive sprocket.

How To Remove The Drive Sprocket On A Chainsaw

The choice of option is often determined by the owner’s attitude to his instrument. If it’s all the same what to cut (wood or steel staples, screws, etc. stuck in it), then you can stop at the first option. The chain, however, will have to be adjusted periodically, thereby reducing the performance of the chainsaw.

It is strongly not recommended to leave the old chain with a new sprocket and vice versa. When the saw blade is worn out, the probability that the tooth pitch will not match is almost one hundred percent. Therefore, at the initial moment of starting, both components of the chain drive will be subjected to significant dynamic loads. As a result, either the chain will stretch prematurely, “adjusting” to the sprocket, or upon impact, one of the teeth on the drive sprocket will burst.

In addition, it is worth focusing on the operation of the bearing assembly of the drive sprocket shaft. When the saw is operating at working speed, only the crankshaft rotates. But all chainsaws periodically operate at idle speed when the bearing rotates. With a lack of lubrication, the wear of the seat occurs, and. as a result. additional beating of the teeth of the still fully functional chain transmission.

From this it follows that when replacing the chain and the drive sprocket for a chainsaw, it is a good idea to replace the bearing at the same time.

Chainsaw Leading Sprocket. Correct selection and replacement

The chain transmission of a chainsaw of any design determines the performance of the tool. over, during operation, the chain is stretched, and the teeth of the drive sprocket wear out. An illiterate selection of an asterisk will dramatically reduce the durability of the chainsaw teeth, and its incorrect adjustment will lead to premature wear.

Design features of the leading sprockets

Any manufacturer indicates the pitch of the teeth in the instruction manual. Considering that a driven sprocket is also installed on the saw bar (designed to create the necessary tension), the step there and there should be the same.

Chainsaw drive sprockets can be solid and prefabricated. In the first case, the sprocket includes a hub onto which a ring gear is pressed. This is how the parts in Champion chainsaws are arranged. The product should be removed completely when replacing, since at home it is almost impossible to comply with the preload value set at the manufacturing plant. And buying a crown separately is also a problem.

In chainsaws from Stihl or Husqvarna, the replaceable crown is located directly on the drum shaft, and therefore its replacement is not difficult.

Tooth wear is established by the following criteria:

  • There are clearly visible radii at the transition from tooth to cavity.
  • Tooth width uneven in height.
  • Chipped metal at the top of the tooth.
  • On the inner surface of the bore in the hub, there are numerous seizures and risks (due to poor lubrication).
  • A groove from the saw bar is visible on the sprocket (the chain must also be changed).
  • The chain seizes at the initial moment of starting.

If at least one of the above factors is present, the drive sprocket must be replaced.

Before starting work (especially if the chainsaw has worked relatively little), it is worth checking the fastening of the saw bar. The tensioner screw has come off or the fastening nuts have been unscrewed. the guide is already misaligned with the longitudinal mowing line of the saw blade. It begins to contact not with the center, but with the periphery of the drive sprocket teeth, provoking their intensive wear. After tightening the indicated elements, the operation of the chainsaw is checked: if the backlash is not eliminated, then the asterisk will have to be changed.

How to remove a drive sprocket from a chainsaw?

As already noted, the sprocket can have a split and pressed crown. Therefore, the sequence of actions will be different.

For a stationary positioned crown, the following is sequentially produced:

  • Dismantling the casing;
  • Removing the bar along with the chain;
  • Disconnecting the clutch from the engine (the piston must first be locked);
  • Removing the clutch together with the drum;
  • Removing the crown from the drum using an ordinary open-end wrench (some manufacturers also attach a puller to the spare parts kit).

The assembly is carried out in the reverse order. For some models, before dismantling the crown, you will also have to remove the air filter.

When disassembling the drive sprocket for a chainsaw, which has a replaceable crown, the order of work will be almost the same, but at the final stage only the crown needs to be replaced.

After completing the work, it is necessary to check the effectiveness of the replacement. To do this, check the chain tension: if, when the brake is released and you try to pull the chain in the direction of its movement, it is motionless, then the fastener is “overtightened” and the tensioner should be slightly released.

The success of the work is determined by the availability of a special repair kit purchased for a specific brand of chainsaw. Otherwise, you should know exactly the size of the saw and the pitch of the teeth.

Structural problems of different models

The problem is complicated by the design of branded chainsaws, which provides for the replacement of a worn drive only after complete dismantling of the clutch mechanism and other components. Alternatively, in order to remove the sprocket from the chainsaw, you must have a special key.

A design feature of a significant part of chainsaw imports is the placement of a sprocket on the clutch mechanism.

  • In case of significant wear of the teeth, the drum must be replaced, which is integral with the drive.
  • A more progressive design of the drive sprocket allows you to restore the performance of the part by replacing the crown.

In the list of factory sets supplied with saws, such a tool is extremely rare. The problem is solved by replacing the worn-out part in a service workshop or by making the necessary device at home.

Leading sprocket life extension method

In practice, for uniform wear of the sprocket ring, a set of several of the same type of chains is used, which alternately change as the cutting edges of the saw links become dull. However, sooner or later, the user is faced with the need to replace a worn part.

Criteria for self-selection of a repair kit

The owner’s desire to equip the headset with a saw chain with a different pitch leads to the need to change the sprocket to a part with a crown of the corresponding profile. This requirement applies to the entire range of European and Chinese chainsaws.

The operational reliability of a European-assembled saw, when working in difficult conditions of increased loads, can significantly deteriorate if a Chinese-made sprocket is installed instead of a branded part.

Alternative solutions

The sequence of working moments is identical for almost all known models on the domestic market for chainsaw technology. Experts advise using a branded part to replace.

If we are talking about the modernization of this unit, the advisability of such a change should be clarified by consulting an experienced specialist.

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The best option is to buy a repair kit, which also includes a replacement bearing. In addition to the key, you may need an individual clutch drum puller for each model, a metal or plastic stopper to fix the piston in a given position.

Lack of prerequisites for the restoration of a worn sprocket

The leading sprocket for a chainsaw of any power category is made of special steel, processed using a special technology, so repair of the part by arc welding and subsequent milling is not possible.

The price of the part itself is several times less than the cost of its replacement in service structures.

  • The advantages of self-repairing the drive unit in less cost and time.
  • With the appropriate tool, the work can be done in a fairly short time interval.

Replacing the drive sprocket on a chainsaw

Regardless of the class of the chainsaw and its performance characteristics, the design of the removable saw sets is almost identical. The saw set includes a guide bar made of a special alloy and a chain, which is activated by the ring gear of the drive mechanism. To extend the resource of the saw chain, timely replacement of the sprocket on the chainsaw is important.

Feasibility of timely replacement of worn out parts of the chain drive

The design of its crown determines such an important parameter as the choice of the chain in step.

  • Installing a new part on a worn sprocket reduces the smoothness of its movement, accelerates wear, initiates the risks of its breakage and creating a traumatic situation.
  • There is also an increase in operating loads on the engine and the elements of the kinematics of the tool.
  • A similar process takes place when old stretched chains are installed on the tire, the diameter of which is adjusted to the size of the tire by removing some of the links.

Experts also advise against arbitrarily changing the size of the sprockets. The experiment can negatively affect the engine life and the kinematics of the tool as a whole.

Safety of sawing work of various degrees of complexity is ensured by the effective operation of the emergency stop brake and devices that block the expansion of the chain ends in case of accidental breakage. In any case. the most reliable prevention of emergency situations, maintenance of the chainsaw in good technical condition.

Algorithm for self-replacement of the clutch drum with an asterisk

The technology of replacing the leading sprocket provides for the implementation of the entire amount of work in a given sequence:

  • Dismantling the headset and air filter;
  • Installation of a piston retainer in the spark plug hole;
  • The clutch and the gear drive, made in one piece with the drum, are removed by means of a puller, you can only unscrew the sprocket in a clockwise direction.

If a large cage wear is detected, the springs of the centrifugal mechanism and cams are broken, it is recommended to replace the entire set.

If the condition of the removed parts is not in doubt, the entire mechanism is assembled in reverse order. To securely fix the clutch on the crankshaft, just unscrew the piston stopper, pull out the standard starter cord and return it to its original position.

Amateur craftsmen should be warned against simplifying the requirements of repair technology and saving money on installing relatively cheap Chinese components.

The quality of the work done is guaranteed by attention, accuracy, adherence to the sequence of all dismantling and assembly operations.

Features of replacing an asterisk on a chainsaw

The chainsaw chain is driven by a drive sprocket, which is connected to the gearbox of a gasoline two-stroke engine. During operation of the tool, wear of the sprocket splines is observed, which negatively affects the functioning of the tool. Sooner or later there comes a time when every sawyer wonders how to remove the sprocket from the chainsaw to replace it, and what this process is.

How to replace a star on a Chinese chainsaw yourself

If you come across a tool where the star is placed on the thread (fixed instead of the bracket), then the replacement process will be somewhat laborious. Let’s consider the sequence of actions in order:

  • First, you need to remove the casing, as well as the bar and chain, as in the first case
  • After that, the protective pad is dismantled, under which the air filter and spark plug are located
  • Unscrew the spark plug. Either a special plastic insert must be screwed into the cylinder, or a cord must be inserted. This is done in order to block the movement of the piston. The cord is used woolen without protruding wire. The best option for such purposes is a wire from the iron.
  • The second option is preferred, as plastic inserts can damage the piston structure. The cord is inserted into the cylinder when the piston does not reach 2-3 mm to TDC
  • When the piston movement is blocked, you should use a special wrench, which is usually supplied with the tool. If there is no such key, you can use the one that is intended for grinders or the usual open-end on “19”
  • You need to rotate the device sideways in a clockwise direction. As soon as the fastening is loosened, you can unscrew the device by hand, dismantle the gear with replacement, and in the same way install all the parts in place.

Finally, when the star is locked, the cord is removed from the cylinder and the plug is installed in place. A detailed description of the dismantling process is presented on.

After the work done, you will need to adjust the chain tension, and resort to checking the tool in action. At this point, the replacement process can be considered complete. How the chainsaw sprocket is replaced, and what this procedure is, is described in detail in the material. If you are faced with various problems, then seek help from specialists who will help you figure out the situation for free.

How an asterisk is removed and changed on a chainsaw

Before removing and replacing the star on the chainsaw, you need to make sure that the part is not subject to further use. To do this, you need to inspect the part, and a photo of a new and worn chainsaw sprocket is shown in the photo below.

To change the gear, you need to decide what type of device is on the tool, and what will be installed. For each type of mechanism, the sequence of actions will be different. Replacing an asterisk on a chainsaw of the first version of the non-separable type is as follows:

    Removing the guard, bar and chain

The process of assembling the mechanism is carried out in the reverse order. If you need to replace a collapsible product, then the process will be almost the same, only in the end one crown without a drum is replaced.

If the replacement process is completed, you need to check. The tension force of the chain is checked, for which the hand brake is turned on, and the chain is pulled in the direction of its movement. The immobility of the product indicates the constriction of the mount. To loosen it, you need to release the tensioner.

When to change a chainsaw sprocket?

If the chain glues at low speeds, the saw is operated for a long time on one chain and a drive sprocket, and during its inspection defects are established, its change is mandatory.

Outwardly, the condition of the sprocket is determined by its teeth. They are considered worn out if they:

  • There are small chips or furrows from the guide;
  • Their width is disproportionate to their height;
  • The angles between teeth and depressions are different;
  • Hub with scuffing and other deformation due to lack of lubrication.

In each of the above options, the sprocket 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 skill: if you hold this motorcycle tool in your hands for the first time, it is better not to experiment with repairs and leave 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 corolla. are selected in accordance with the model of a particular chainsaw;
  • Repair tool kit.

How to remove a prefabricated sprocket from a chainsaw

Removing the collapsible gear occurs in the same sequence, except for the last operation. In its course, not the entire gear is removed, but only its crown.

To do this, release the brake and pull the blade in the direction of the working movement. If there is no play, then the chain is overtightened and should be loosened. If, however, it is possible to pull back so that the gap between the links and the tire is visible, the tension is insufficient and its

How to extend the life of a leading sprocket?

Experienced sawers recommend working with several identical blades, changing them as the links become dull. This technique will help to significantly reduce wear on the drive gear, but it certainly cannot completely prevent it. Sooner or later it will have to be removed and replaced.

A little about the rules for operating the node

All chainsaws, regardless of the manufacturer, are divided into:

  • Household. Low power. Designed for small amounts of home renovation work. Duration of continuous work: half an hour. an hour. Recommended use. up to 50 hours per month.
  • Semi-professional. Medium or high power Able to work for several hours without interruption. Suitable for small buildings or renovations. Monthly use. up to 100 hours.
  • Professional. High power, extra functionality. Can be used continuously throughout the entire work shift. Designed for felling, medium and large construction, procurement shops of enterprises.
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All of them have a similar design of the main units and high build quality. The main difference lies in the design of the working chain and in the materials used to manufacture parts and assemblies.

The suitability of your chainsaw depends on how you use the blade and sprocket. There are usually two of them:

  • The chain is used until the teeth are completely worn out. Together with her, they change the gear.
  • Several chains with different pitch are used, which correspond to their gears, corresponding to them in the number of teeth and pitch.

In the first case, they saw everything, including nails and staples. This causes increased wear on both the chain and gear. You often have to edit and sharpen the chain, spending a lot of time on it.

At the start, the teeth will hit the links, which will lead to increased vibration and wear of the entire chainsaw.

The condition of the gear-blade pair also affects the operation of the clutch and drive bearing. In “Run” mode, the crankshaft rotates. In idle mode, with the clutch disengaged, the bearing begins to rotate. With insufficient lubrication, it is subject to increased wear, which causes even more tooth runout.

Both the blade and the sprocket are subject to periodic replacement. Better to do it at the same time

How to remove and change a leading sprocket on a chainsaw?

When operating chainsaws, sooner or later it becomes necessary to remove and replace the drive sprocket. This procedure is not complicated, so for the sake of it it is not necessary to contact the service. you can do everything yourself. In this article, we will look at how to remove and change a drive sprocket on a chainsaw.

Chainsaw drive sprocket device

An asterisk or centrifugal mechanism is a part shaped like a star. It absorbs the engine torque and transfers it to the guide and saw chain. This guarantees the rotation of the cutting attachment and the sawing process itself. It works in automatic mode, which depends on the magnitude of the motor speed.

The clutch drum can be localized both outside the chainsaw and on its inside. under a separate cover. It provides a protective function not only for 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 the chain rotation, the drive sprocket of the saw prevents the occurrence of malfunctions of the motor system in cases where the chain jams or stops rotating.

How to remove a sprocket from a chainsaw: several options for different clutch drum designs. Chainsaw drive sprocket classification

In accordance with the power class of the saws on which they are installed, the asterisk can be:

  • Professional;
  • Household.

The main difference between them is the frequency of replacement and the rate of wear: in models of the “Profi” series, wear is faster, and repairs are more frequent.

By design features, the leading chainsaw sprockets are:

  • National teams;
  • Whole.

The latter consist of a hub with a stationary rim of a certain number of teeth. Their factory pressing does not allow removing the crown separately from the hub. This situation is typical for many Chinese chainsaws, for example, from the “Champion” brand.

The case with prefabricated sprockets is simpler: the removable crown is quickly unscrewed from the drum axis, so the repair does not cause any particular difficulties. This option is an advantage of most European saws, for example Stihl or Husqvarna.

Replacing an asterisk on a Chinese chainsaw

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How an asterisk is removed and changed on a chainsaw

Before removing and replacing the star on the chainsaw, you need to make sure that the part is not subject to further use. To do this, you need to inspect the part, and a photo of a new and worn chainsaw sprocket is shown in the photo below.

To change the gear, you need to decide what type of device is on the tool, and what will be installed. For each type of mechanism, the sequence of actions will be different. Replacing an asterisk on a chainsaw of the first version of the non-separable type is as follows:

    Removing the guard, bar and chain

How to remove the protective cover on a gasoline tool

Removing the retaining ring, and behind it the washers

Removing the corkscrew ring

  • The gear wheel is dismantled together with the drum mechanism. The condition of the product is assessed. The presence of defects indicates the need to replace it.
  • The roller type bearing is removed, which is also best replaced if there are signs of wear. If the condition of the bearing is satisfactory, it can be lubricated and reinstalled. When installing a new bearing, it must also be thoroughly lubricated with Litol-24 lubricant.
  • Instead of a non-separable device, a collapsible mechanism can be installed. This will subsequently simplify the process of replacing the drive gear.
  • The process of assembling the mechanism is carried out in the reverse order. If you need to replace a collapsible product, then the process will be almost the same, only in the end one crown without a drum is replaced.

    Structural differences between one-piece and collapsible gears

    If the replacement process is completed, you need to check. The tension force of the chain is checked, for which the hand brake is turned on, and the chain is pulled in the direction of its movement. The immobility of the product indicates the constriction of the mount. To loosen it, you need to release the tensioner.

    It is interesting! When replacing the mechanism in question, it is recommended to buy a special suitable repair kit for a specific tool model, depending on the chain pitch.

    Removal and replacement process

    How the sprocket is removed will depend on the design of the chainsaw. Chainsaws can be divided into two types according to the location of the leading star:

    In the first case, the removal process is somewhat easier. To do this, you just need to pull off the retaining ring with a screwdriver, after which the sprocket can be easily removed.

    In the second case, you first have to remove the clutch. To do this, you need to lock the shaft on which it is located. This can be done in two ways:

    • Or, unscrew the candle and screw in a special piston stopper instead, which would prevent the latter from moving.
    • Alternatively, from the starter side, insert a suitable wrench or screwdriver into one of the available holes in order to lock the impeller there. True, this method is dangerous in that the sprocket is often tightened quite tightly, which is why it is more likely to break the impeller blades than to unscrew the star. Therefore, if you do not have a stopper from the previous method, then use the folk method from the next paragraph.
    • The popular way is that instead of a special stopper, you can push a piece of cloth into the combustion chamber through the hole where the candle is wrapped, leaving part of it outside so that you can pull it out later. The fabric will take up all the space inside and prevent the piston from moving upwards, which will cause the shaft to stall. At the same time, due to the fact that the fabric itself is soft, it will not cause any damage to the walls of the cylinder.

    After the shaft is locked, the clutch can be unscrewed. You need to use either a special puller, or you can get by with a suitable open-end wrench by inserting it into the grooves on the clutch. Unscrewing is done clockwise, since the thread on the shaft is left.

    By unscrewing the clutch, you can now easily remove the sprocket.

    The installation of new parts must be done in reverse order.

    As you can see, nothing complicated. everyone can handle it.

    Method for a star with a stationary crown

    To do this, produce:

    • Dismantling the protective cover and tire cutting set;
    • Blocking of the piston part of the motor;
    • Disconnecting the clutch from the engine system;
    • Removing the clutch and centrifugal sprocket from the saw body;
    • Visual inspection of the sprocket and its toothed part;
    • If defects are detected, replace the sprocket with a new clutch drum;
    • Diagnostics of the chainsaw clutch elements for defects. worn out centrifugal springs and cams can negatively affect the operation of the sprocket;
    • If there are no faults, proceed to the assembly stage. For this you need:
    • Remove the stopper;
    • Pull off the ignition cable;
    • Screw on the stopper to fix the centrifugal mechanism on the motor shaft;
    • Clamp the clutch with a universal wrench in the direction opposite to the chain;
    • Return the remaining removed parts to their original positions.
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    How to remove a drive sprocket from a chainsaw?

    As already noted, the sprocket can have a split and pressed crown. Therefore, the sequence of actions will be different.

    For a stationary positioned crown, the following is sequentially produced:

    • Dismantling the casing;
    • Removing the bar along with the chain;
    • Disconnecting the clutch from the engine (the piston must first be locked);
    • Removing the clutch together with the drum;
    • Removing the crown from the drum using an ordinary open-end wrench (some manufacturers also attach a puller to the spare parts kit).

    The assembly is carried out in the reverse order. For some models, before dismantling the crown, you will also have to remove the air filter.

    When disassembling the drive sprocket for a chainsaw, which has a replaceable crown, the order of work will be almost the same, but at the final stage only the crown needs to be replaced.

    After completing the work, it is necessary to check the effectiveness of the replacement. To do this, check the chain tension: if, when the brake is released and you try to pull the chain in the direction of its movement, it is motionless, then the fastener is “overtightened” and the tensioner should be slightly released.

    The success of the work is determined by the availability of a special repair kit purchased for a specific brand of chainsaw. To move the carburetor away from now you need to remove and chainsaws “Stihl 180”, like. Otherwise, you should know exactly the size of the saw and the pitch of the teeth.

    Algorithm for replacing the clutch drum

    Chainsaw clutch closes the sprocket.

    First of all, it should be noted that when buying spare parts for a chainsaw, you need to strictly observe the type of drum or use the advice of a specialist when it comes to modernizing it. As a rule, when changing the drum and saw chain at the same time, the drum bearings are also replaced.

    Here you should purchase a special repair kit, which provides for the presence of both a drive sprocket and a bearing. Then you should prepare the tool and parts that will be required for the work:

    • Universal wrench, sold with the chainsaw;
    • Mechanism piston stopper (plastic or metal in standard versions);
    • Centrifugal mechanism or clutch puller (selected depending on the model of the chainsaw).

    During the operation, the following actions are performed:

    Chainsaw sprocket location diagram.

    • First, the saw headset is removed, the tire cover nuts are unscrewed with a universal wrench. The cover is removed, the bar and chain are removed.
    • Then the air filter is removed.
    • The saw candle is unscrewed with the universal key. Instead, a prepared piston stopper is inserted, which will allow fixing the position of the piston in the cylinder.
    • The clutch remover fits into the universal wrench socket. Then, using the resulting device, the clutch is unscrewed. All actions must be carried out clockwise.
    • The clutch is removed, freeing access to the internal parts. Now you can remove the sprocket (clutch drum).
    • Depending on the type of drum, it is inspected or the crown is checked. The asterisk or crown is replaced with new ones. When installing new parts, the condition of the clutch separator must be carefully checked. Special attention must be paid to the springs of the centrifugal mechanism and the cams. If severe wear is detected, these parts also need to be replaced.
    • If the condition of the parts does not cause any complaints, all parts of the chainsaw are assembled in the reverse order. First of all, the piston stopper is unscrewed, the starter cord is pulled out, then the stopper is screwed in again. Such complex actions allow you to clamp the centrifugal mechanism of the chainsaw on the crankshaft.
    • Using a standard universal key, the clutch is clamped counterclockwise, that is, against the rotation of the chain.
    • After that, all nodes and parts can be successfully screwed into their original places.

    Without special tools, repair work can end in failure: not only the star or centrifugal mechanism can break, but also the saw chain.

    As can be seen from the information provided, the question of how to remove the sprocket from the saw can be successfully solved on our own. Once performed, the operation will allow you to carry out it again and again, as soon as the need arises, and attention and accuracy will be the key to a well-done work.

    What is a chainsaw sprocket for?

    Chainsaw sprockets are parts of the clutch basket that rotate the chain. On chainsaws, a type of centrifugal drive is used, which is triggered automatically, which depends on the speed of the engine itself.

    The device of the centrifugal mechanism is such that when the chainsaw is idling, the sprocket does not rotate. This is due to the fact that the clutch basket elements have a degree of freedom. This freedom is provided by friction linings and springs. As soon as the number of revolutions increases, the centrifugal force increases the force of the springs, as a result of which the elements with the friction linings are displaced. This transfers torque to the drum and sprocket, which in turn moves the saw chain.

    This design of the clutch mechanism is due to the fact that when the chain is seized, it slips. Thus, it is possible to prevent the internal combustion engine from jamming, as well as to avoid its premature failure. Regular use of the saw leads to the fact that the crown wears out, and it becomes necessary to replace it.

    How to determine the need to replace the crown

    The sprocket is replaced immediately after the product in question wears out and cannot perform its functions. The wear of the crown can be determined by the following characteristic properties:

    • The presence of noticeable radii in the area of ​​transition of the tooth to the cavity.
    • Metal chips at the top of the teeth.
    • Uneven tooth width.
    • Detection of scoring on the inside of the hub.
    • Grooving from the tire.
    • The chain comes off the tire.

    The most important sign by which you should check for the above points is the appearance of signs of a chain jam when starting the chainsaw. Any of the above factors requires immediate replacement of the element in question. Details on the types of leading sprockets and their differences can be found at.

    Design features

    The leading sprocket of a chainsaw can be of two types: modular or solid (stationary). The one-piece is in the form of a one-piece device, which is located directly behind the clutch. Such sprockets in the form of a clutch plate with a welded toothed sprocket are also called stationary. This type of construction is used in most chainsaws. Replacing such crowns on a chainsaw does not present any difficulties, but you only need to remove them entirely with a drum.

    On expensive chainsaws, assembled type sprockets are used. The crown is put on the drum shaft, as a result of which the torque is transmitted to the chain. Replacing a prefabricated device is even easier as the crown is removed and the drum remains in place. The prefabricated structure of the element in question is a way to extend the life of the clutch. After the drive sprocket is worn out, it needs to be replaced. If this is not done, then the resource of the tool is significantly reduced, as a result of which the wear rate of the internal combustion engine increases.

    How to remove an asterisk from a chainsaw: varieties and design features

    With the constant use of a tool such as a chainsaw, it is important to regularly carry out diagnostic measures by replacing consumables and parts. One of these consumables is a sprocket or chain drive mechanism. If the question arises about how to remove the sprocket from the chainsaw correctly, then it’s time to replace it. When and how to correctly replace the crowns on chainsaws, we will consider further.

    How to remove an asterisk on a chainsaw

    Before changing the sprocket on a chainsaw, you first need to purchase a new element. The drive sprocket should be changed based on the type of element used on the chainsaw. On household and semi-professional units, one-piece devices are often used, and on professional units, prefabricated.

    The process of removing a one-piece product is the following:

    • Initially, the casing is dismantled.
    • After that, the saw bar is removed together with the chain.
    • Retaining ring and washer are removed.
    • After that, you can remove the clutch together with the drum.
    • The crown is removed from the drum using a special wrench, which is usually attached to the tool.

    After replacement, reassemble the removed parts in reverse order. The process of replacing the rims of the assembled type is practically similar to dismantling a solid product, only, ultimately, only the gear element should be replaced without a drum. After the work carried out, it is necessary to carry out a check, assessing the effectiveness of the actions performed. For this, the chain is tensioned using the tensioner adjusting screw.

    From the foregoing, it follows that replacing the crowns is an important diagnostic measure, if not observed, the owner of the chainsaw risks premature occurrence of the need for overhaul of the motor. The above is an excellent material that describes all the design details, removal and replacement of the chainsaw sprocket.