How to remove a sprocket from a Husqvarna chainsaw with your own hands: replacing the drive sprocket on a Shtil 180 and Partner chainsaw, video

Chainsaws produced by well-known manufacturers of special tools are characterized by high reliability and long service life. This is due to the thoughtfulness of the design and the use of special grades of tool steel from which all moving and rubbing parts are made. These primarily include:

chain with cutting edges;
guide bar;
a chain sprocket driven into rotational motion by the energy of a single-cylinder two-stroke gasoline engine.

They all work intensively and wear out over time. Even slight changes in the geometric dimensions of these parts impair the performance and smooth operation of the saw. If you need to remove the sprocket from the chainsaw to replace it, you need to understand the principle of operation of the clutch system with which it is directly connected.

Replacing a sprocket on a chainsaw: how to remove and change it yourself

Any manufacturer indicates the tooth pitch in the operating instructions.
Considering that a driven sprocket is also installed on the saw bar (designed to create the necessary tension), the pitch here and there should be the same. Chainsaw drive sprockets can be solid or prefabricated. In the first case, the sprocket includes a hub onto which a ring gear is pressed. This is exactly how the parts in Champion chainsaws are arranged. When replacing, the product should be removed completely, since at home it is almost impossible to maintain the tension value specified at the manufacturer. And purchasing 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 replacing it does not present any difficulties.

Tooth wear is determined by the following criteria:

There are clearly visible radii at the transition points from the tooth to the cavity.
The width of the tooth is uneven in height.
There are metal chips at the top of the tooth.
There are numerous burrs and marks on the inner surface of the hole in the hub (a consequence of poor lubrication).
There is a noticeable groove on the sprocket from the saw bar (the chain also needs to be changed).
The chain jams at the initial moment of start-up.

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

Before starting work (especially if the chainsaw has been running for relatively little time), it is worth checking the fastening of the saw bar. The tensioner screw has come loose or the fastening nuts have come loose - the guide is no longer aligned with the longitudinal line of the saw blade. It begins to contact not with the center, but with the periphery of the teeth of the drive sprocket, provoking their intense wear. After tightening the specified elements, check the operation of the chainsaw: if the play is not eliminated, then the sprocket will have to be changed.

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

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

Removing the casing;
Removing the saw 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 a regular open-end wrench (some manufacturers also include a puller with the spare parts kit).

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

When disassembling a chainsaw drive sprocket that has a replaceable ring, the procedure will be almost the same, but at the final stage only the ring 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 an attempt is made to pull the chain in the direction of its movement, it is motionless, then the fastening is “overtightened” and the tensioner should be slightly released.

The success of the work is determined by the presence 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.

The Husqvarna 137 chainsaw is designed in such a way that all resources maintain maximum performance for a long time:

The Auto-Tuning option allows you to use automatic carburetor tuning.
If air enters, secondary filtration occurs, which reduces the load on the filter.
Vibration attenuation is due to the LowVib function.
There is the possibility of easy starting, thanks to which the operation of the Husqvarna 137 chainsaw is not interrupted at any time of the year.
The chain tensioner is located on the side of the housing.
For various private adjustments and repairs, a universal key is used.
The drive sprocket is equipped not only with an auxiliary hole for receiving lubricants.

The video will help you change the drive sprocket on a Husqvarna chainsaw. I will show you in detail and step by step how to do it.

An asterisk or centrifugal mechanism is a part shaped like a star. It takes on the engine torque and transmits it to the guide and saw chain. This guarantees the rotation of the cutting set and the sawing process itself. It operates automatically, which depends on the amount of engine speed.

The clutch drum can be located both outside the chainsaw and on its inside - under a separate cover. It performs a protective function not only in relation to the material from which the sprocket is made, but also for the operator, who may be injured by it during work. In addition to the function of chain rotation, the saw drive star prevents the occurrence of malfunctions of the motor system in cases where the chain jams or stops rotating.

The drum, located at the base of the mechanism's clutch, is an integral part of the chain drive system. This part is shaped like a star, which is how 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 requires regular replacement. If we talk about household tools, then everything depends on the amount of work performed and the load that is placed on the device circuit.

Most often, the sprocket, ring and saw bearing require replacement.

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

Usually, in order to remove the sprocket from a 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 event does not look complicated, but it requires having all the necessary parts and tools. The sprocket replacement process is similar for any device model.

The Allen wrench is the main tool you will need when replacing the sprocket.

The most common reasons that force tool repairs associated with replacing the drive sprocket are:

chain jamming due to defects occurring during operation of the unit;
high sprocket wear as a result of long-term operation of the unit.

With regular use of the device, increased wear of the drive sprocket occurs as a result of increased loads placed on it during the process of sawing wood. There are two ways to operate the device:

use of one saw chain;
using several saw chains alternately.

When using the first method of operation, the chain is operated until it is completely worn out. This method has several disadvantages. The main one is the problem with monitoring wear during intensive operation of the unit.

When using two or more chains in the process, it is possible to achieve uniform wear of the chains and sprocket, which allows you to extend the period of operation of the device before repairs, which involve replacing the sprocket. In addition to sprocket wear, you should not forget about the bearing that is installed in the sprocket. This structural element operates at any engine speed. When replacing the sprocket, the bearing must also be replaced at the same time.

The coupling complete with sprocket must be replaced promptly. If repair work is not carried out in a timely manner during operation, the tool experiences increased vibration, which leads to increased wear of the bearings installed in the internal combustion engine on the crankshaft axle shafts.

The design of the chainsaw has not only a driving sprocket, but also a driven sprocket. The driving sprocket of the chainsaw is located in the design of the tool, and the driven sprocket is located at the end of the bar. The purpose of the driven device is to equalize the tension and direction of movement of the chain device.

Driven star on tool bar

Leading devices can be solid or prefabricated. Solid products consist of a hub with a pressed-on gear ring. When replacing, the entire mechanism assembly is dismantled, since the gear structure is one-piece. Chainsaws of many well-known brands are equipped with solid gears from the factory.

What does a solid gear look like on a chainsaw?

Collapsible products are more advanced, since the process of replacing them is simplified through the simplest mechanism design. Only one crown is replaced, the cost of which is 2 times less than the prefabricated mechanism. The appropriate wear of gear teeth can be determined by the following signs:

The presence of large radii at tooth transition points
Uneven tooth width
Detection of chips and metal shavings on the top of the teeth
Scores and marks on the inner surface of the holes in the hub
When starting the tool, chain jamming is detected

Currently reading: Technical characteristics of the Husqvarna 450e chainsaw
When the drive unit wears out, it is imperative to replace it. You can do this yourself, for which you initially disassemble the tool and determine the version of the installed device. Even if a non-separable gear is installed on the tool, then instead of it you can install a prefabricated mechanism, which is more rational.

Collapsible gear type for chainsaw

There are two types of installation of leading stars on chainsaws. The first method involves placing the gear on the outside. Such designs are the most common on Stihl chainsaws. The design of such a device is shown in the photo below.

Non-separable type product on the tool

The second option is typical for instruments of Chinese origin. The gear teeth are located not on the outside, but on the inside, that is, the device is located in reverse.

Star design on a Chinese chainsaw

Depending on the design of the tool, the process of dismantling the products in question will differ.

What do you need to know before replacing?

Most modern chainsaws, regardless of the manufacturer, have a similar design and identical mechanisms, and before disassembling your tool, you need to study the principles of its operation, namely the clutch system. Most models have a centrifugal clutch that operates automatically when a certain speed is reached. The main part of this system is the clutch sprocket or drum.

The part got its name from its star-shaped shape; it serves as an intermediary in the transmission of torque from the engine to the saw and guide chain. In addition, it also performs a protective function, preventing the occurrence of engine malfunctions in situations where the chain stops rotating or jams.

The sprocket can be located both inside and outside the clutch assembly, but is always covered with a protective cover, not only for the safety of the mechanisms, but also for safety of use.

Before you begin directly replacing the sprocket, it is important to understand what type of part this part is in your saw. Let's figure it out.

Causes of malfunctions and how to determine the need for replacement

When idling, the spring compresses the cams and they do not touch the drum. As the speed increases, the centrifugal force exceeds the spring stiffness and the cams come into contact with the walls of the drum. The latter begins to rotate.

The teeth of the saw chain mesh with the teeth of the drive sprocket. One of the functions of an automatic centrifugal clutch is to protect the engine when the load on the chain increases beyond the permissible limit. This can occur when the chain gets stuck.

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

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

Wear on the drive sprocket teeth can occur for several reasons:

natural wear and tear along the chain teeth;
accelerated wear as a result of excessive chain tension or lack of lubrication;
incorrectly selected chain;
technological defect.

Metal wear can be determined visually by inspecting the sprocket without removing it from the saw. Dents and chips on the surface should not exceed 0.5 mm.

The need for replacement is determined by increased noise when the chain moves, but this is typical only in the presence of deep potholes. It is difficult to notice shallow wear during operation, but the chain will wear out greatly. When the teeth are broken, the chain may move jerkily, which is especially noticeable during operation.

The clutch operates automatically, depending on the number of engine revolutions.

The units are equipped with a centrifugal clutch, which operates automatically, depending on the number of engine revolutions.

When the engine of the unit operates at idle or low speed, the elements of the clutch basket, which have friction linings, have a certain level of freedom in the circular direction. The presence of freedom of movement leads to the fact that, under the action of springs, the elements are attracted to the center of the rotation shaft and do not transmit rotational motion to the sprocket drum.

As the engine speed of the device increases, the centrifugal force exceeds the force of the springs, which leads to displacement of parts with friction linings. Replacing the piston on a Chinese chainsaw. Replacing the piston group of a Chinese chainsaw 4500replacement piston group of chainsaw 4500 cylinder-piston group for a 45 mm chainsaw replacing the piston group on a chainsaw stihl ms180 chainsaw china replacement.

Replacing the sprocket on how to unscrew the clutch on a chainsaw. On a Chinese chainsaw. These elements are pressed against the inner walls of the drum under the influence of centrifugal force. Due to this contact, rotational motion is transmitted to the drum and sprocket, which drives the saw chain of the tool.

More common reasons that force tool repairs associated with replacing the drive sprocket are:

chain jamming due to defects appearing during operation of the unit;
the highest wear of the sprocket as a result of long-term operation of the unit.

professional;
household.

The main difference between them is the frequency of replacement and the rate of wear: in the models of the “Pro” series, wear occurs faster and repairs occur more often.

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

The situation with prefabricated sprockets is simpler: the removable crown is quickly unscrewed from the drum axis, so repairs do not cause any particular difficulties. This option is an advantage of most saws of European origin, for example, Shtil or Husqvarna.

Drive gears, according to their design, are divided into:

Whole. The part includes a hub into which the crown is pressed. You can only remove the part for replacement in its entirety. In the industrial conditions of the manufacturing plant, it is possible to ensure the design values of the interference. Special equipment is used for this. This operation cannot be carried out in a home workshop. Difficulties also arise when trying to buy a crown separately - the manufacturer does not consider it an independent part and does not supply it to stores and service centers.
Prefabricated. The crown is made as a separate part; it can be removed using a special puller or special tricks with a universal tool.

Solid sprocket

Experts identify the following signs of wear on the drive gear teeth:

semicircular depressions are visible at the base of the tooth;
the thickness of the tooth varies with height;
chipped zones at the top;
scratches appeared inside the hub hole;
the chain has worn out the groove on the sprocket;
When starting, the chainsaw jams.

A chainsaw sprocket with such signs should not be used; it must be removed and replaced.

According to the manufacturer's recommendations, the tool should be inspected before starting work. In this case, be sure to check the condition of the saw bar and whether it is securely fastened. If the screw that regulates the position of the chain roller and its tension is loosened, or the nuts securing the bar to the body are loosened, it deviates from the plane of the chain.

Sprockets with replaceable and stationary crown

After tightening the fasteners and making adjustments, do a test run. If free play remains, the sprocket will have to be removed and replaced.

The Husqvarna 137 chainsaw is an amateur, semi-professional class tool. The model achieved high popularity among consumers due to its good performance, light weight and versatility. These days, the Husqvarna 137 chainsaw is actively used not only by gardeners, but also by utility workers.

There are already several 10-cylinder chainsaws in operation from different manufacturers, capacities, and most importantly for special purposes. Saws are divided into:

prof (for felling and construction);
household (garden).

Currently reading: What Gap Should a Chainsaw Spark Plug Have?

Accordingly, their drive gear will be different, as well as the sequence of actions. Discover 253 best selection of husqvarna chainsaw sprockets 142 chainsaw chainsaw replacement. Assembling a husqvarna 142 chainsaw. Husqvarna 140 chainsaw. Replacing a chainsaw sprocket. Husqvarna 340 chainsaw repair, chainsaw replacement sprocket.

In this regard, you need to know how to remove the sprocket from the chainsaw correctly so as not to damage the tool. This part is also called a centrifugal mechanism or clutch disc.

To better understand the entire process, it is necessary to understand what an asterisk is and how it is used.

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DIY chainsaw chain sharpening

The main malfunctions of chainsaws and steps to eliminate them are described here.

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If the part is not replaced in a timely manner, the stability of the tool will be impaired. A worn part provokes excessive vibrations, which, in turn, have a negative effect on the crankshaft bearings.

Tooth wear of up to 0.5 mm is considered normal. However, users often bring the part to a deeper groove of about 1 mm, not realizing that operation causes damage to other parts of the chainsaw. Naturally, subsequently there is a breakdown of the bearings, which need to be replaced.

When the engine of the unit is running at idle or low speed, the elements of the clutch basket, which have friction linings, have a certain level of freedom in the radial direction. The presence of freedom of movement leads to the fact that, under the action of springs, the elements are attracted to the center of the rotation shaft and do not transmit rotational motion to the sprocket drum.

When the engine speed of the device increases, the centrifugal force exceeds the force of the springs, which leads to displacement of elements with friction linings. These elements are pressed against the inner walls of the drum under the action of centrifugal force. Due to this contact, rotational motion is transmitted to the drum and sprocket, which drives the saw chain of the tool.

The main advantage of this type of clutch is that when the saw chain jams, elements with friction linings slip, which protects the internal combustion engine from serious damage.

The main malfunctions of chainsaws and steps to eliminate them are described here.

Features of the Husqvarna 137 chainsaw, which is suitable for all types of work in gardens and households, plantations, small factories and more, is designed with a 2.2 horsepower engine. The fuel tank is designed for 0.4 liters. Recommended tire for Husqvarna 137 chainsaw.

H30, and the length can vary from thirty-four to thirty-eight centimeters. It should be borne in mind that in order to avoid early wear and unforeseen failures, you can not only meet the manufacturer's performance requirements, but also use original spare parts for the Husqvarna 137 chainsaw, which are in an affordable price range.

Quick repair of Husqvarna 137/142. Replacing the oil pump.

A fairly common problem with Husqvarna 137 and 142 chainsaws is oil pump failure. This video shows the rapid.

The chainsaw clutch covers the sprocket.

First of all, it should be noted that when purchasing spare parts for a chainsaw, you must strictly observe the type of drum or use the advice of a specialist if we are talking about its modernization. Typically, when replacing the drum and saw chain at the same time, the drum bearings are also replaced.

Professional chainsaw from STIHL

There are already several dozen chainsaws in operation from different manufacturers, capacities, and most importantly for special purposes. Saws are divided into:

professional (for felling and construction);
household (garden).

Accordingly, their drive gear will be different, as will the sequence of actions. This is a feature of saw gear devices. For most professional tools, the tire can change its position on the saw in two planes.

You may also be interested in the article,

The main malfunctions of chainsaws and steps to eliminate them are described here.

And in this article, you can learn how to repair a Parterre 350 chainsaw.

There are already several 10-cylinder chainsaws in operation from different manufacturers, capacities, and most importantly for special purposes. Saws are divided into:

prof (for felling and construction);
household (garden).

Accordingly, their drive gear will be different, as well as the sequence of actions. Discover 253 best selection of Husqvarna chainsaw sprockets 142 chainsaw chainsaw replacement. Assembling a Husqvarna 142 chainsaw. Husqvarna 140 chainsaw Husqvarna 340 chainsaw repair, chainsaw replacement sprocket.

The drum, located in the clutch base of the mechanism, is an integral part of the chain drive system. This detail, in its shape, resembles a star, which is why it got its name. how to replace the drive sprocket in a chainsaw yourself, the sprocket on the clutch. How to replace the cable on a chainsaw | video on.

Depending on the type of chainsaw, the part can be professional or household. Because a professional saw is used more often than a household saw, the leading sprocket also requires constant replacement. How to disassemble the engine on a friendship chainsaw on the saw you need to replace the seals. If we talk about household tools, then everything depends on the amount of work performed and the load that is placed on the device circuit.

The main malfunctions of chainsaws and steps to eliminate them are described here.

When constantly using a tool such as a chainsaw , it is important to regularly carry out diagnostic measures, replacing consumables and parts. One of these consumable elements is a sprocket or chain drive mechanism. If the question arises about how to properly remove the sprocket from a chainsaw, then the time has come to replace it. When and how to correctly replace the crowns on chainsaws, we will consider further.

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

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

If the teeth are significantly worn, the drum, which is integral with the drive, must be replaced.
A more advanced design of the drive sprocket allows you to restore the performance of the part by replacing the ring.

In the list of factory kits 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.

The technology for replacing the drive sprocket involves performing the entire amount of work in a given sequence:

dismantling the headset and air filter;
installing a piston retainer in the spark plug hole;
The clutch and the gear drive, integral with the drum, are removed using a puller; the sprocket can only be unscrewed clockwise.

If significant wear of the separator, breakage of the springs of the centrifugal mechanism and cams are detected, it is recommended to replace the entire set.

If the condition of the removed parts is beyond doubt, the entire mechanism is assembled in the reverse order. To securely fix the clutch on the crankshaft, it is enough to unscrew the piston stopper, pull out the standard starter cord and return it to its original position.

READ How much oil is in a chainsaw per 1 liter

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

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

dismantling the protective cover and tire-cutting set;
stalling of the piston part of the engine;
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 chainsaw clutch elements for defects - worn centrifugal springs and cams can negatively affect the operation of the sprocket;
If there are no faults, we proceed to the assembly stage. To do this you need:

remove the stopper;
pull out the ignition cable;
screw the stopper to fix it on the motor shaft of the centrifugal mechanism;
Use a universal key to tighten the clutch in the opposite direction of the chain;
return the remaining removed parts to their original positions.

The second method on how to unscrew a sprocket on a chainsaw with a collapsible clutch drum looks more simplified compared to the previous one. The sequence of actions will be similar, but not the entire star will be subject to disassembly and reinstallation, but only a separate part of it - the ring gear.

We should not forget that installing a new chain on a chainsaw bar is one of the reasons to re-equip the saw with a new sprocket. Otherwise, the chain will stretch prematurely or break during operation. Less wear on the clutch drum is achieved by alternately using several chains and periodically servicing its bearing.

Gasoline chainsaws, like most other tools, require periodic diagnosis of breakdowns and replacement of worn parts.

A significant part of them are associated with the chainsaw drive sprocket or clutch disc - one of the important elements of all chainsaws without exception.

Despite the relative simplicity of its design and the instructions in the operating instructions, every year thousands of inexperienced craftsmen reach a dead end in this matter and waste money on service centers or produce it incorrectly, which further aggravates the problem.

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

The clutch drum can be located both outside the chainsaw and on its inside - under a separate cover.

It performs a protective function not only in relation to the material from which the sprocket , but also for the operator, who may be injured by it during work.

In addition to the function of chain rotation, the saw drive star prevents the occurrence of malfunctions of the motor system in cases where the chain jams or stops rotating.

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

professional;
household.

The main difference between them is the frequency of replacement and the rate of wear: in the models of the “Pro” series, wear occurs faster and repairs occur more often.

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

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

Externally, 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;
the angles between the teeth and cavities are different;
hub with scoring and other deformations due to lack of lubrication.

How to change a star on Husqvarna

Replacing a sprocket on a chainsaw: how to remove and change it yourself

The video will help you change the driven sprocket on a Partner chainsaw, we will show you how to simply and quickly remove the clutch.

The video will help you change the driven sprocket on a Husqvarna chainsaw. I will carefully and step by step show you how to do it.

A significant part of them are associated with the chainsaw drive sprocket or clutch disc - one of the important elements of all chainsaws without exception.

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

A fairly common problem in Husqvarna 137 and 142 chainsaws is oil pump failure. This video shows a quick one.

The video will help you change the drive sprocket on a Husqvarna chainsaw. I will carefully and step by step show you how to do it.

When to remove the clutch

Disassembly of the clutch for the purpose of removal is carried out in the following cases:

when the spring bursts (the chain turns, the engine runs intermittently);
the spring flew off;
a piece of the drum has broken off (in this case, noise will be heard and the chainsaw chain will also spin);
temporary wear (it’s time to remove and change the clutch due to the end of its life).

Modern chainsaws operate on two-stroke engines, which are connected by a gearbox to the saw chain. The chain moves along the bar, and according to the centrifugal principle, idling should remain motionless, that is, be safe for the person holding the chainsaw.

If the load placed on the tool exceeds the recommended load, the clutch will weaken or completely stop transmitting torque to the tire. This will cause the engine to stop. When such situations occur, the clutch wears out and therefore needs to be replaced over time. In the operating instructions for chainsaws, some manufacturers have information that the clutch is a consumable part, that is, it must be periodically replaced.

Video - how to remove the clutch on a chainsaw:

Sequencing

Chainsaw sprocket, ring and bearing

The vast majority of household saws are sold under the Partner brand. It is enough to simply change the sprocket in them, even at home, by purchasing a repair kit.

Since most often the sprocket in household saws is a assembled mechanism, it rotates due to the bearing. That is, when changing the sprocket, you inevitably change the bearing and the shaft.

In professional models (such as Shtil and Husqvarna), as well as in household ones, if it is not possible to have a specialized wrench on hand for removing the star, they use a soft cord with a diameter of 5-6 mm.

In all cases, the sequence of actions is as follows:

The side cover must be opened to gain access to the tire and sprocket.

Next, you need to remove the tire by loosening the chain.

This is what a chainsaw tire looks like

Once the sprocket is free, you need to unscrew the spark plug to gain access to the engine piston.

A little about the rules for operating the node

Regardless of the manufacturer’s brand (Shtil, Husqvarna, Partner, Patriot, Makita), chainsaws are divided into household, semi-professional and professional. The difference, however, lies not in the quality of assembly or manufacturing of components, but in the class of tasks performed, performance and long-term drive power. This determines the choice of material for the drive sprocket for the chainsaw, its design and the design of the saw chain.

The performance of the tool will be determined by the way the chain-sprocket pair is used. In most cases, users use one of two options:

The chain is used 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 that have different pitches, and each will require its own drive sprocket.

The choice of option is often determined by the owner’s attitude towards his instrument. If it doesn’t matter what to cut (wood or steel staples, screws, etc. stuck in it), then you can go with the first option. The chain, however, will have to be adjusted periodically, thereby reducing the performance of the chainsaw.

It is strictly not recommended to leave the old chain with the new sprocket and vice versa. If 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 start-up, both components of the chain drive will be subject to significant dynamic loads. As a result, either the chain will stretch prematurely, “adjusting” to the sprocket, or one of the teeth on the drive sprocket will burst upon impact.

In addition, it is worth focusing on the operation of the bearing assembly of the drive sprocket shaft. When the saw operates at operating speed, only the crankshaft rotates

But all chainsaws periodically operate at idle speed when the bearing rotates. If there is a lack of lubrication, wear of the seat occurs, and - as a result - additional runout of the teeth of a still fully functional chain drive.

It follows from this that when replacing the chain and drive sprocket for a chainsaw, it is a good idea to simultaneously replace the bearing.

How to remove and change the sprocket on a chainsaw

On the left is a new part, and on the right the unit shows obvious signs of wear. If, after removing the tool guard, a chipped gear tooth is discovered, the part must be replaced. To do this, you need to buy an asterisk in a tool store or in an online store, where there is a much larger selection, which will allow you to choose the best option.

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 the sprocket on a chainsaw of the first version of the non-separable type is as follows:

Removing the casing, as well as the bar and chain
How to remove the protective cover on a power tool
Removing the retaining ring and the washer behind it
Removing the corkscrew ring
The gear 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 better to replace if there are signs of wear. If the condition of the bearing is satisfactory, then it can be lubricated and installed in place. When installing a new bearing, it must also be thoroughly lubricated with Litol-24 type lubricant.
Instead of a non-separable device, you can install a prefabricated mechanism. This will simplify the process of replacing the drive gear later.

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

Design differences between solid and collapsible type gears

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If the replacement process is completed, you need to check. The tension force of the chain is checked by turning on the handbrake and pulling the chain in the direction of its movement. The immobility of the product indicates that the fastening is overtightened. To loosen it, you will need to release the tensioner.

Types of drive sprockets

There are two types of drums, depending on the purpose of the chainsaw, professional and household. The frequency of sprocket replacement depends on this: if a household saw is used much less frequently than a professional saw, then consumables such as the sprocket, bearings or crown require replacement less often.

By design, drive sprockets are of two types:

Solid or non-separable type. As the name suggests, this is a single structure where the clutch plate and drive ring are firmly welded or pressed together. If necessary, the entire part is replaced.

To the left of the clutch drum (aka sprocket) there is a needle bearing.
Collapsible gear type. The drive ring is placed on special splines of the clutch plate. This design is used mainly in professional instruments, because The clutch plate wears out much more slowly, and replacing the ring is much cheaper than assembled parts.

To the right of the clutch drum is a replaceable ring.

Once you have determined the type of saw you have and the sprocket that needs to be replaced, you can begin the process of upgrading the mechanism.

Repair of Partner P350 XT chainsaw. replacing the drive sprocket

Repair of Partner P350 XT chainsaw. replacing the drive sprocket.

The design of its crown determines such an important parameter as the choice of chain by pitch.

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

Experts also do not advise arbitrarily changing the size of the sprockets. The experiment may have a negative impact on the service life of the engine and the kinematics of the tool as a whole.

The safety of sawing operations of varying degrees of complexity is ensured by the effective operation of the emergency stop brake and devices that block the scattering of the ends of the chain in the event of an accidental break. In any case, the most reliable prevention of emergency situations is maintaining the chainsaw in good technical condition.

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

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

The advantages of self-repairing the drive unit are less costly and time-consuming.
If you have the appropriate tool, the job can be completed in a fairly short time interval.

If the gear has a replaceable ring, you should carefully check the condition of the base. If nicks, chips, deep scratches, changes in geometry or corrosion are detected, not only the crown, but the entire part should be replaced. The combined operation of worn and new parts in one assembly will lead to a reduction in the service life of the entire assembly. The risk of jamming or circuit breakage increases significantly.

In addition, the vibration load on the clutch, transmission and engine of the device will increase. The same factors arise during prolonged operation of one circuit.

You should also not change the diameter of the gears (and, accordingly, the number of teeth). When working with an enlarged or reduced sprocket, forces arise in the transmission and engine that the designers of the device did not expect. This will shorten the tool's service life and will not improve its performance.

Despite the presence in the design of the chainsaw of safety systems that instantly stop the movement of the blade when it breaks or the tire is destroyed and protects torn links from scattering, it is better not to lead to such situations. The need to replace the gear is only increased by safety requirements.

Husqvarna sprocket for chainsaw in the online spare parts store “Benzo-Zip”

The drive or drive star plays a big role in the performance of the saw set, since it is this part that provokes the cutting chain to move. An important function is also performed by the Husqvarna sprocket for the chainsaw in question, called the driven one - it is located on the back side of the tire, on the outer side, and acts as the basis along which the tackle also moves. How long the Husqvarna chainsaw sprocket will perform its functions will depend on the intensity of work, the correct distribution of loads on the chain and bar, and the correct choice of material for cutting.

It is quite logical that over time its teeth wear out, but are also subject to mechanical stress when in contact with foreign objects. With “BenzoZip” you will always have a working saw at hand, because ordering a sprocket from us is very simple and profitable!

Algorithm for self-replacement of the clutch drum with sprocket

Removing the chain

As with any other tool, chainsaws require careful maintenance. It is necessary to constantly check the oil supply to the chain, chain tension, operation of the brake, ignition system, etc. Fortunately, almost any problem can be solved at home on your own.

dismantling the headset and air filter;
installing a piston retainer in the spark plug hole;
The clutch and the gear drive, integral with the drum, are removed using a puller; the sprocket can only be unscrewed clockwise.

If significant wear of the separator, breakage of the springs of the centrifugal mechanism and cams are detected, it is recommended to replace the entire set.

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

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

Clutch mechanism repair - spring replacement

Do not rush to change the entire mechanism, since a clutch malfunction can be eliminated by replacing the faulty part. Most often, the cause of the malfunction is a spring that stretches and can become damaged. An already stretched spring is faulty. If the spring is damaged, it can be replaced to restore the functionality of the tool. Replacement instructions depend on the design of the mechanism, since compression devices come in different types, but all of them can be replaced. This procedure is not so much complicated as it requires special care and adherence to the sequence of actions. How to replace the spring on a chainsaw clutch is shown in detail in the video clip.

If the friction lining is damaged, this part can also be replaced. Part replacement is also necessary if the threaded connection wears out, which happens when the coupling is frequently removed and replaced. To understand the cause of a part malfunction, you will first need to perform a visual inspection. If the sprocket teeth are worn, it should be replaced. Fixed sprockets must be changed along with the drum.

Removal and replacement process

In the first case, the removal process is somewhat simpler. 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 will 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 spark plug and screw in a special piston stopper instead, which would prevent the latter from moving.
Or, from the starter side, insert a suitable key or screwdriver into one of the existing holes to lock the impeller there. However, this method is dangerous because often the sprocket is 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 traditional method from the next point.
The popular method is that, instead of a special stopper, you can push a piece of fabric into the combustion chamber through the hole where the candle is wrapped, leaving part of it outside so that you can later pull it out. The fabric will occupy all the space inside and will not allow the piston to move upward, which will cause the shaft to stall. Moreover, due to the fact that the fabric itself is soft, it will not cause any damage to the walls of the cylinder.

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

Having unscrewed the clutch, you can now easily remove the sprocket.

Installation of new spare parts must be done in reverse order.

As you can see, it’s nothing complicated—everyone can do it.

How to extend the resource?

Like any mechanism, a chainsaw needs preventive inspections and quality maintenance.

After each sprocket replacement, lubricate the bearing.
Give preference to quality spare parts and reliable consumables.
Simultaneous replacement of the saw chain and clutch leads to a change in pitch and wear of the headset. Don't resort to this unless absolutely necessary.
Clean the chain and saw parts from dirt by removing the protective side cover.
Monitor the sound and vibration of the saw during operation. If the beat is off or rattling appears, carry out an unscheduled maintenance. and instrument diagnostics.

When selecting spare parts for repair or maintenance, choose parts manufactured in the same country as the original ones. This will reduce the likelihood of mismatch and poor quality, and will also extend the life of the chainsaw.

It is worth remembering that with proper care and timely maintenance, the gear lasts a long time and very rarely requires replacement. If you are still faced with the need for replacement, then use our recommendations, they will help you do everything quickly and accurately. The process of replacing the sprocket itself takes little time; the most important thing is to unscrew it.

Design problems of different models

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

If the teeth are significantly worn, the drum, which is integral with the drive, must be replaced.
A more advanced design of the drive sprocket allows you to restore the performance of the part by replacing the ring.

In the list of factory kits 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.

A little about the rules for operating the node

The performance of the tool will be determined by the way the chain-sprocket pair is used. In most cases, users use one of two options:

The chain is used 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 that have different pitches, and each will require its own drive sprocket.

In addition, it is worth focusing on the operation of the bearing assembly of the drive sprocket shaft. When the saw operates at operating speed, only the crankshaft rotates

It follows from this that when replacing the chain and drive sprocket for a chainsaw, it is a good idea to simultaneously replace the bearing.

Alternative solutions

The sequence of operating moments is identical for almost all known models on the domestic market of chainsaw equipment. Experts advise using a branded part for replacement.

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

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