How to remove an asterisk from a carver chainsaw

remove, asterisk, carver, chainsaw

When to change your 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 grooves from the guide;
  • their width is disproportionate to their height;
  • angles between teeth and depressions are different;
  • hub with scuffing and other deformations due to lack of lubrication.

In each of the above options, the sprocket is subject to repair.

Chainsaw drive sprocket classification

  • 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:

  • prefabricated;
  • 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 the advantage of most European saws, for example Stihl or Husqvarna.

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 located 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.

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 rim. are selected in accordance with the model of a particular chainsaw;
  • repair tool kit.

How to remove a sprocket from a chainsaw: several options for different clutch drum designs

Replacing an asterisk on a chainsaw. how to remove and change it yourself

Gasoline chainsaws, like most other tools, require periodic diagnostics of breakdowns and replacement of worn parts. A significant part of them are associated with a drive sprocket for a chainsaw or a clutch disc. one of the important elements of all chainsaws, without exception. Despite the relative simplicity of its design and instructions for use, every year thousands of inexperienced craftsmen come to a standstill in this matter and spend money on service centers or produce it incorrectly, which further exacerbate the problem.

That is why we will dwell on this topic and understand the structure, functional features and repair of this working unit of chainsaws.

Method for a star with a stationary crown

To do this, produce:

  • dismantling of the protective cover and tire cutting set;
  • locking of the piston part of the motor;
  • disconnecting the clutch from the engine system;
  • notch from the saw body of the clutch and the centrifugal sprocket;
  • 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 back the ignition cable;
  • screw the stopper to fix it on the motor shaft of the centrifugal mechanism;
  • clamp the clutch with a universal wrench in the direction opposite to the chain;
  • return the remaining removed parts to their original positions.

Method for a star with a collapsible clutch drum

Do not forget that installing a new chain on a chainsaw tire is one of the reasons to re-equip the saw with a new sprocket. Otherwise, the chain will stretch ahead of time or break during operation. Less wear on the clutch drum gives the alternate use of several chains and periodic maintenance of its bearing. This mechanism is used exclusively at idle: when the speed rises, it is not involved in work. Experts recommend changing it simultaneously with the chain and sprocket and systematically lubricating it with chain oil.

Reasons for malfunction and how to determine the need for replacement

Drive sprocket teeth can be worn for several reasons:

  • normal wear and tear together in the chain teeth;
  • accelerated wear as a result of excessive tension or lack of lubrication of the chain;
  • incorrectly selected chain;
  • technological defect.

Metal wear can be determined visually by examining 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 when the chain moves, but this is typical only in the presence of deep potholes. It is difficult to notice shallow development during operation, but the chain will wear out strongly. If the teeth are broken, the chain can move in jerks, which is especially well felt during operation.

How to install

After all work has been completed, the sprocket can be replaced with a serviceable one. The assembly is carried out upside-down. It is advisable to additionally lubricate the needle bearing.

When tightening the nut, there is no need to apply much effort, since it will tighten itself during operation.

Design features and functions

The chain drive sprocket is functionally combined with the clutch drum, inside which there are cams compressed by a spring. The peculiarity of the design device is that the engine shaft passes and rotates freely inside the clutch drum. Expanding jaws are rigidly fixed at the end of the shaft.

When idling, the spring compresses the cams and they do not touch the drum. As the speed increases, the centrifugal force exceeds the spring rate and the cams come into contact with the drum walls. The last one starts to spin.

The saw chain teeth mesh with the drive sprocket teeth. One of the functions of the automatic centrifugal clutch is to protect the engine when the load on the chain exceeds the allowable limit. This can occur if the chain is seized.

The outer part of the drum is covered with an emergency brake band. When the handle is folded back, the tape is pressed against the drum and slows down its rotation. The effect is the same as when the chain is jammed.

A feature of all chainsaws. the drum and clutch cams are attached to the shaft with a nut with a left-hand thread so that the mechanism does not spin during operation.

Algorithm for replacing the clutch drum

For trouble-free use of the chainsaw, regular technical inspection is necessary.

When replacing the clutch drum, only a strictly defined type of structural element of the device should be used for installation. When replacing the drum, the bearings of the structural element should be changed.

To carry out repair work, you should purchase a special repair kit, which includes a drive sprocket and a bearing. After purchasing the repair kit, prepare the materials and tools required for the repair. The main tools that will be required during the repair are the following:

  • universal wrench that comes with the chainsaw;
  • piston stopper, can be made of plastic or metal;
  • special puller of the centrifugal mechanism or clutch drum.

The work procedure consists of several stages. Each stage has its own characteristics, depending on the design features of the chainsaw, but the scheme and sequence of work is the same for any model of the unit.

Types of stars

Depending on the class of the chainsaw, all the stars are divided into two groups. professional and household. The first type of parts have increased wear resistance, are made of strong metal alloys that are not subject to corrosion and mechanical damage. Households often require replacement and scheduled repairs; with active use of the tool, diagnostics are recommended every six months. By design features, the following types of asterisks can be distinguished:

  • National teams. The removable ring can be easily unscrewed from the drum axis, which makes it easy to check and replace this part. Almost all European models of chainsaws are equipped with such stars.
  • Whole. They consist of a hub and a stationary crown (the number of teeth may be different, you need to carefully read the instructions for the chainsaw). Due to the factory pressing, the crown cannot be removed separately from the hub, therefore, in case of a breakdown, the entire clutch drum must be disassembled. Such a mechanism is usually found on Chinese models.
Read more:  How to Install a Chain on a Stihl Chainsaw

If you plan to service the chainsaw on your own, then it is recommended to purchase a tool with a professional type of drive sprocket. It should be collapsible, which reduces the cost of repair and maintenance of the tool.

The sequence of repair work

At the first stage, the saw headset is dismantled, the guide bar cover is removed. After removing the cover, the guide bar and saw chain are dismantled. The fastening nuts are unscrewed using the universal wrench, which is included in the delivery set of the unit.

After removing the saw chain and guide bar, the air filter is removed. Then the spark plug is dismantled. In place of the dismantled spark plug, a pre-prepared engine piston stopper is installed. The stopper allows you to fix the position of the piston in the cylinder and prevent the crankshaft from turning. The clutch should be removed using a special puller installed in the socket of the universal wrench. All actions should be carried out clockwise.

After removing the clutch, an approach to the internal parts of the device opens, that is, after removing the clutch, the sprocket can be removed.

After removing the clutch drum, depending on its type, the crown and sprocket are inspected and checked. Depending on the design of this unit, the worn out structural elements are replaced. When carrying out repairs, special attention should be paid to the springs of the centrifugal mechanism and its cams. If wear is found, replace them.

If the components do not cause any complaints, all structural elements are installed on the chainsaw in the reverse order. First of all, unscrew the piston stopper and pull out the starter cord, after which the piston stopper is installed in place. This complex sequence of operations makes it possible to clamp the centrifugal mechanism onto the crankshaft of the unit. The clutch is installed in place and clamped using the universal wrench supplied with the chainsaw. Clamping with a key should be done counterclockwise.

The last stage of the repair work is the installation of the remaining structural elements of the device.

When replacing the sprocket, all work must be carried out carefully and with care. All repair work must be carried out using special tools, otherwise the centrifugal mechanism or the saw chain may be damaged.

The chainsaw requires regular diagnostics and periodic replacement of worn parts. With regular use, not only the saw headset becomes unusable, but also the drive sprocket. In this tool, it acts as a clutch disc, which is why it has a significant load both during start-up and during operation. The asterisk on the chainsaw has a simple design, so repairs and maintenance are easy to do with your own hands. In this article, we will look at how to determine the degree of wear of this part and carry out a planned replacement.

Saw Dogs. Monster Wine

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 fastening of the saw headset 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, we smoothly pull the kick starter cord, lifting the piston up, but not bringing it to the end. We push a long piece of thick cord into the candle hole until the space of the combustion chamber is filled. This is to prevent the piston from going past 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 protrude from the hole so that later it can be removed.

To unscrew the sprocket, you need a special wrench, which rarely comes with saws, especially for cheap models. You need to use a drift made of soft metal. copper or aluminum.

The drift is leaned against the protrusions of the cams of the centrifugal mechanism and light blows are applied with a hammer. The direction of impact should be almost parallel to the plane of the clutch, since at a large angle, the cam mount can be bent 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 chisels as there is a high risk of damaging the clutch.

After loosening the nut from its place, you can unscrew it by hand.

Some saw manufacturers use simple left-hand nuts to attach the clutch and sprocket. Then the task is simplified, since for removal you can take a simple open-end wrench of the required size.

Now remove the drive sprocket, being careful not to lose the plastic oil pump drive gear and the needle bearing.

How to remove an asterisk from a chainsaw: self-replacement

Today, almost every resident of a country house or summer resident has his own chainsaw. You cannot do without it during regular logging, gardening and municipal work. The demand for chainsaws does not fall, but even grows due to the fact that these devices do not require much knowledge and skills to work. The only thing that needs to be done regularly is to carry out technical inspections.

As with any tool, chainsaws require careful personal care. It is necessary to constantly check the oil supply to the chain, chain tension, brake operation, ignition system and other things. Fortunately, almost any malfunction can be solved at home on your own.

Troubleshooting

Whatever one may say, but breakdowns still occur. But it is important not just to repair the device, but to determine the root cause.

The most common problems:

  • Oil leaks due to a violation of the integrity of the oil hose or its sealing at the attachment points.
  • Oil does not flow to the chain due to clogged feed channels with dust and chips.
  • The engine does not start or starts and immediately stalls due to an unregulated / malfunctioning carburetor, clogged sopun, air filter, muffler.
  • Chain wedges due to drive sprocket defects.
  • Engine clogged due to carburetor malfunction and high fuel supply.

Replacing an asterisk on a chainsaw with your own hands

In the process of regular operation of the chainsaw, the sprocket shown in the photo experiences heavy loads, and therefore it often fails. The sprocket, or otherwise the clutch drum, is an important and integral part of the chainsaw, which transfers the rotational energy from the drive to the chain.

Considering the safety of the drive sprocket and chainsaw chain, there are two ways to operate:

  • using only one chain;
  • using two or more chains alternately.

In the first case, the chain can be operated until it is completely erased. However, there are a number of inconveniences here. Using only one chain, it is problematic to monitor its condition during intensive work. Hitting nails or other metal parts makes it necessary to adjust the chain, but since it is alone, the work is slowed down.

In the second case, the alternation of the chains allows uniform wear of both the sprocket and the chains.

In addition to the wear of the sprocket itself, do not forget about its bearing, which operates in idle mode. Therefore, very often they do not pay attention to it and forget to lubricate.

Usually, when replacing a drive sprocket, they immediately try to replace both the bearing and the chain. This is done due to the change in the length of the chain pitch as a result of intensive work.

The procedure to change the asterisk on a chainsaw with your own hands

There are many videos on the Internet that clearly demonstrate how to replace the clutch drum (sprocket) of such famous brands as Stihl, Husqvarna, Druzhba, Ural and others. It’s easy to find them.

Read more:  How to Dilute Oil Into a Chainsaw

Each type of chainsaws has its own design features, but their principle of operation is the same, so the general idea is reduced to the following actions:

  • The chain brake cover is removed. In this case, the brake should be pulled towards you so that the brake band does not come into contact with the clutch cup. Next, a couple of nuts holding the cover are loosened. The chain tension is released allowing the cover to be removed completely.
  • The tire is removed with a chain, along the way, any dirt is removed.
  • Now you need to fix the piston in the cylinder. This is done using a special stopper and retainer, but you can use a regular rope. By rotating the clutch, it is necessary to detect the moment when the piston reaches the outlet. The rope is lowered into the spark plug hole and fixes the piston. For convenience, several knots are tied on the rope. After replacement, the rope will need to be removed, so it should not be released.
  • After that, you can start unscrewing the clutch nut. It is important not to forget that there is a left-hand thread, that is, you need to twist it in a clockwise direction. The use of a chisel with a hammer is unacceptable. This will damage the nut.
  • The clutch and sprocket drum can now be removed.
  • Replacing the clutch drum.
  • Assembling all parts together in reverse order.

When replacing a sprocket, some features of the various saws should be taken into account. For example, a Stihl chainsaw may have a washer between the sprocket and the engine. You need to remember its position, remove and repeat the position during assembly.

Also, some chainsaw oil drives are equipped with a mustache spring to transfer rotational energy from the sprocket to the pump. If, when assembling the saw, the mustache does not fall into its groove, then the oil will stop getting on the saw chain, which can lead to sad consequences.

To avoid most breakdowns, including the drive sprocket, it is necessary to monitor the technical condition of the saw, regularly inspect, lubricate, etc. You also need to make sure that nails, concrete, stone and other obstacles that lead to early wear of parts do not meet in the path of the chain.

As for replacing the drive sprocket, here you should use information about the design features of the saw (Husqvarna, Stihl, Ural, Druzhba and others), which can be found in the instructions attached to the saw.

Recommendations: how to remove an asterisk from a chainsaw

Many tools require regular replacement of consumable parts. This also applies to drinking. That is why the question of how to remove an asterisk from a chainsaw, which is also often called a clutch disc or centrifugal mechanism, is very relevant for home craftsmen. In this regard, it is necessary to consider what is called an asterisk and why it is needed.

The clutch drum, called a sprocket, is an integral part of your chainsaw.

Features of the clutch drum in chainsaws

The drum located at the base of the clutch of the mechanism is an integral part of the chain drive system. This detail resembles a star in its shape, due to which it got its name. Depending on the type of chainsaw, the part can be professional or household. Since a professional saw is used more often than a household saw, the drive sprocket also needs to be replaced regularly. If we talk about household tools, then everything here depends on the amount of work performed and the load that is on the circuit of the device.

Most often, the sprocket, ring and saw bearing need to be replaced.

In any case, the main reason for replacing a sprocket is chain wear on its teeth. In the event that a monolithic drum is installed in the device, the surface of the chain cuts it almost completely, which requires a complete replacement of the entire part. If the chainsaw has a drum with a replaceable crown, here you can limit yourself only to replacing the crown.

Usually, in order to remove the sprocket from the chainsaw, many people turn to specialized service centers, but if there is a need to save the family budget, you can do this work yourself. This activity does not look complicated, but it requires you to have all the necessary parts and tools. The sprocket replacement process is the same for any device model.

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:

  • a universal wrench sold with a chainsaw;
  • mechanism piston stopper (plastic or metal in standard versions);
  • puller of the centrifugal mechanism or clutch (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.
  • After that, the air filter is removed.
  • The saw candle is unscrewed with the universal wrench. 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 key 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. Particular attention must be paid here 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 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.

In order to replace the sprocket on a chainsaw, all work must be done carefully and carefully.

Without special tools, repair work may end in failure: not only the star or centrifugal mechanism may 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 it to be carried out again and again, as soon as the need arises, and attention and accuracy will be the key to a well-done work.

How to change a star on a chainsaw?

If the chain begins to vibrate even at low speeds, the chainsaw is operated for a long time without replacing parts. it is required

carry out diagnostics and, if necessary, change the components of the saw headset. For a planned replacement, you will need a new clutch drum or whisk, depending on the specific model, a basic set of tools:

  • candle key;
  • cable up to 15 cm long or piston stopper;
  • factory key for removing the clutch;
  • adjustable or wrench. Figure 3. Required tools for changing the star

It is recommended to have a round file, pliers, a vise and a knife to eliminate defects in the design from the chain set (if only tooth correction is required).

Types of stars

Depending on the class of the chainsaw, all the stars are divided into two groups. professional and household. The first type of parts have increased wear resistance, are made of strong metal alloys that are not subject to corrosion and mechanical damage. Households often require replacement and scheduled repairs; with active use of the tool, diagnostics are recommended every six months. By design features, the following types of asterisks can be distinguished:

  • National teams. The removable ring can be easily unscrewed from the drum axis, which makes it easy to check and replace this part. Almost all European models of chainsaws are equipped with such stars.
  • Whole. They consist of a hub and a stationary crown (the number of teeth may be different, you need to carefully read the instructions for the chainsaw). Due to the factory pressing, the crown cannot be removed separately from the hub, therefore, in case of a breakdown, the entire clutch drum must be disassembled. Such a mechanism is usually found on Chinese models.
Read more:  DIY Chainsaw Carb Adjustment

If you plan to service the chainsaw on your own, then it is recommended to purchase a tool with a professional type of drive sprocket. It should be collapsible, which reduces the cost of repair and maintenance of the tool.

When replacement is needed?

The saw head and drive sprocket are subject to natural wear and tear during operation. This is not a breakdown, but a routine maintenance procedure for the tool. Reasons for replacing the sprocket:

  • intensive and long-term use of the saw;
  • mechanical shock of the headset;
  • using the wrong chain. Figure 2. Leading star on a chainsaw

Normal wear of the drive sprocket teeth is up to 0.5 mm. With regular work, this figure can reach up to 1 mm, but over time this will lead to a load on the engine, damage to other parts of the saw. You can determine the need for replacement or repair by the following signs:

  • there is mechanical damage to the guide sprocket;
  • the width of the teeth is disproportionate to their height;
  • there are asymmetric corners;
  • the hub has chips, grooves or large burrs.

If you do not timely diagnose and prevent the moving parts of the chainsaw, vibration increases and the impact on the crankshaft bearings increases. As a result, this leads to costly repairs, serious tool breakage.

Important! Manufacturers recommend inspecting the drawbar when the chain comes into contact with a metal object while cutting.

How to assemble?

The assembly of the coupling mechanism should be carried out in the reverse order. First, install the sprocket on the needle bearing, then put on the drum, washer, gasket and the clutch itself. Tighten counterclockwise, lightly fix the piston.

If your chainsaw has an oil drive spring, it can be built into the drive sprocket. In most models, the correct position of this element is marked with a special color or notch. To get to the desired position, turn the sprocket until it clicks.

The last step in the assembly is to install the guide bar. During this process, it is required to release the handbrake, and then check that the chain teeth fit into the corresponding grooves. After installation, mount the chainsaw chain until it is operational. Finally, remove the stopper, screw in the spark plug and replace the filter. The final step of the repair is to secure the protective cover of the case.

How to unscrew?

It is easy to remove and replace this part yourself. Work technology:

  • Secure the piston in the saw cylinder. First, remove the protective cover on the body, the air filter and unscrew the spark plug. Install a special piston stopper in the hole formed. instead, you can use a dense nylon cord or wire up to 15 cm long.If the piston interferes, you can slightly turn the sprocket or move the chain clockwise.
  • Unscrew the bolts on the cover that secures the tire, remove the protective cover. Loosen the chain tension or remove the saw attachment. At the same time, you can clean from dust, dirt and sawdust.
  • Depending on the model, the sprocket acts as an element of the clutch drum or can be installed separately. In the second option, remove this part, replace it with a new one. The one-piece construction is difficult to repair. it is required to disassemble the unit. To do this, unscrew the coupling clockwise, remove the drum. Check structural parts for wear and deformation. Figure 4. Replacing the star with a new one

If the sprocket is an element of the clutch drum, then the entire part will have to be changed. When replacing, you should pay attention to the conformity of the model. it must be similar to the factory one.

The device of a leading star on a chainsaw

Almost all models of modern chainsaws use a centrifugal clutch system. The specificity of this mechanism is that when the maximum number of revolutions of the gasoline engine is reached, the clutch drum starts automatically, transferring the rotation to the drive sprocket. This reduces stress on the base parts of the tool, extending life and maximizing productivity.

Figure 1. Diagram of the drive sprocket

The clutch drum, where the sprocket is located, can be located on the inside or outside of the chainsaw body. There is always a cover on top to protect moving mechanisms from dirt, sawdust and dust. The clutch itself is a metal disc in the clutch drum. The entire mechanism is attached to the engine crankshaft by bolts with springs, along the edges of which there are friction linings. When the engine speed exceeds a certain value, centrifugal force is generated, exerting strong pressure on the inside of the drum. After that, the sprocket starts up. the rotation of the chain saw begins.

Important! It is the sprocket that drives the chainsaw chain. All parts of this mechanism are closely interconnected, a breakdown of the headset leads to a malfunction of the instrument.

Chainsaw Carver Extraordinaire, Griffon Ramsey | HUMAN

Features of replacing the star for chainsaws of different brands

When replacing or repairing a chainsaw, the design features of the model should be taken into account. The specifics of servicing the coupling drum of popular manufacturers:

  • Stihl (Stihl). The models of this brand have one-piece and collapsible types of sprockets. To unwind the clutch, you need a 19 head and a knob. It should be noted that the thread is left-handed, and a reflective plate is installed behind the clutch (consumable, often breaks when diagnosing a drum).
  • Partner (Partner). The peculiarity of this brand is that when replacing the sprocket, it is recommended to change the bearing as well. If you ignore this step, after a scheduled repair there is a risk of chain malfunction, changing the pitch during active sawing.
  • Husqvarna (Husqvarna). Many Husqvarna models use an interchangeable sprocket. This simplifies scheduled replacement and repairs. When disassembling the tool, you will need a 13 wrench to fix the shaft from the impeller side.
  • Carver (Carver). Unlike other manufacturers, there are no specific design features of the clutch. Depending on the brand, the star can be solid or collapsible.

It is recommended that you carefully read the instructions before starting the scheduled repairs. It indicates the important design features of the saw, the frequency of replacing consumables.

Expert advice: How to properly remove a sprocket from a chainsaw?

The chainsaw requires regular diagnostics and periodic replacement of worn parts. With regular use, not only the saw headset becomes unusable, but also the drive sprocket. In this tool, it acts as a clutch disc, which is why it has a significant load both during start-up and during operation. The asterisk on the chainsaw has a simple design, so repairs and maintenance are easy to do with your own hands. In this article, we will look at how to determine the degree of wear of this part and carry out a planned replacement.

  • The device of a leading star on a chainsaw
  • Types of stars
  • When replacement is needed?
  • How to change a star on a chainsaw?
  • How to unscrew?
  • How to assemble?
  • Features of replacing the star for chainsaws of different brands
  • How to reduce wear on the drive sprocket?