How to unscrew the clutch on a chainsaw calm
Vlad, Odessa:
“In the process of repairing a chainsaw, I had the following situation: the clutch did not give in at all, did not want to be removed. Jammed, in a word. This “old-fashioned way” helped: the location of the thread was slightly heated with a burner, very carefully so as not to damage the oil seal. And everything worked out. Maybe someone will find my advice useful. “.
Stihl chainsaw clutch repair review
Chainsaw clutch replacement review
Chainsaw clutch replacement
Chainsaws, for various reasons, need to be repaired from time to time. Of course, you can contact a service workshop or an experienced mechanic. However, many problems can be fixed at home with only a minimal set of skills and tools.
Answering the question of how to remove the clutch from a chainsaw, we note that this is not a difficult operation, if you adhere exactly to the disassembly technology. Owners of the tool may face certain difficulties if the chainsaw has been in use for a long time, and the clutch parts have become attached to each other. However, in this case, disassembly can be done by hand.
Repair kit, required tool
In order to remove, disassemble or adjust the clutch, we need the following tools:
Dismantling the chainsaw clutch:
How to remove and replace a clutch on a chainsaw. repair and adjustment
One of the most important parts of a chainsaw is the clutch or clutch mechanism. During the operation of the tool, this part may fail, which will entail the impossibility of carrying out work on sawing wood. If the clutch mechanism is out of order, then the question immediately arises of how to remove the clutch on the chainsaw. This need arises when you need to repair or replace the device. How to do this is described in the material.
DIY How To Remove Chainsaw Clutch without Specialty Tools – Saw Repair – Poulan Husqvarna Stihl Echo
Removing and replacing the clutch on a chainsaw. Overview, instruction
Reasons why you need to disassemble the clutch:
- Defective or burst spring;
- As a result of loads on the chainsaw and wear of parts, the spring has left its place;
- Chips on the clutch plate;
- Wear of parts.
How to Replace the Clutch on a Chainsaw
How to unscrew the clutch on a chainsaw calm
Often faced with breakdowns caused by improper actions of the owners of the tool when unscrewing the clutch. How this is done is described in general terms in the article.
This task is faced every time there is a need to remove the drive sprocket and / or the chainsaw clutch.
On the web, you can find a lot of videos and text material on this issue. If desired, all this is easy to find. It’s always a good idea to look up the information you need in the tool’s user guide.
Each saw model has its own characteristics in performing this procedure. Therefore, we will describe this process from a general ideological position.
Remove the chain brake cover. First, pull the brake lever toward you. This must be done to prevent the brake band from touching the clutch cup. Then loosen the two nuts holding the cover. Loosen the mechanical chain tensioner. Loosen the tension on the chain and bar. Then finally unscrew the two nuts and remove the chain brake cover.
Remove bar and chain, remove dirt, if any.
Remove the spark plug from the cylinder spark plug hole.
Next, you need to fix the piston in the cylinder. To do this, rotating the clutch, we observe the upward movement of the piston. In most cases, once the piston closes the exhaust port, lower any suitable rope into the spark plug hole just enough to prevent the piston from moving further up. You can tie simple knots on the rope to enhance the effect. Remember that the rope will have to be pulled back later. So don’t miss the second end;)
Next, remove the clutch and drum with a driving sprocket.
Assess the condition of the needle bearing.
Assembly is carried out upside-down.
Some nuances to be aware of:
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 at the same time.
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, you should prepare the materials and tools required for the repair. The main tools that will be required when carrying out repairs 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.
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.
Removing the clutch from a 45cc Chinese chainsaw (Baumr SX45)
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 previously 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. Remove the clutch using a special puller installed in the socket of the universal key. 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, you can remove the sprocket.
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 carefully. All repair work must be carried out using special tools, otherwise the centrifugal mechanism or the saw chain may be damaged.
The chain transmission of a chainsaw of any design determines the performance of the tool. over, during operation, the chain stretches, and the teeth of the drive sprocket wear out. An illiterate sprocket selection will dramatically reduce the durability of the chainsaw teeth, and its incorrect adjustment will lead to premature wear.
Unit clutch design
Chainsaws are units that are equipped with drive sprockets, which are a single complex with a clutch basket.
The clutch engages automatically, depending on the number of engine revolutions.
A centrifugal clutch is installed on the units, which works in automatic mode, depending on the number of engine revolutions.
When the engine of the unit is idling or at low speeds, 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 the springs, the elements are attracted to the center of the rotation shaft and do not transfer the rotational motion to the sprocket drum. With an increase in the engine speed of the apparatus, the centrifugal force exceeds the force of the springs, which leads to displacement of the 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, the rotational movement is transmitted to the drum and sprocket, which drives the saw chain of the tool. The chain saw sprocket can be located either outside the tool, or under a special cover that protects the mechanism from damage, and the operator of the device from injury.
The main advantage of this type of clutch is that when the saw chain is jammed, elements with friction linings slip, which protects the internal combustion engine from serious damage.
How to remove the clutch from a chainsaw and put it back in place?
Diagram of the process of removing the clutch from a chainsaw (for example, let’s take a situation when a drum needs to be replaced):
- remove the saw headset using a universal key;
- remove the chain, tire;
- unscrew the air filter cover;
- then we twist the candle;
- we fix the piston with a stopper or rope;
- remove the clutch with a punch (puller) or a universal wrench to remove the clutch;
- remove the clutch by unscrewing it clockwise;
- remove and replace the drum.
After the steps described above, the entire assembly is carried out in the reverse order.
The main reasons for replacing the drive sprocket
The universal wrench is the main tool you will need when replacing the sprocket.
The most common reasons that force the tool to be repaired associated with the replacement of the drive sprocket are:
- jamming of the chain due to the occurrence of defects during the operation of the unit;
- high wear of the sprocket 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 the application of increased loads on it in 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 of 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 repairing the sprocket. In addition to the wear of the sprocket, one should not forget about the bearing that is installed in the sprocket. This structural element works at any engine speed. When replacing a sprocket, change the bearing at the same time.
The clutch complete with the sprocket must be replaced in a timely manner. If the repair work is not carried out on time during operation, the tool has increased vibration, which leads to an increase in the wear of the bearings installed in the internal combustion engine on the crankshaft axles. The maximum depth of wear of the sprocket teeth should not exceed 0.5 mm. The life of the sprocket is twice that of a single chain, so two chains should be used during operation. After the chains have reached the end of their life, replace the chains and the drive sprocket at the same time.
How to adjust the clutch of a chainsaw?
How is the clutch adjustment on a chainsaw carried out? It is more correct to talk about repair, since the carburetor is usually subject to adjustment, and not the clutch. When we talk about adjusting the clutch, it is important to consider two nuances:
- Chainsaws of some models, including German, Finnish, Swedish, have a special washer, it can be located between the motor and the sprocket or between the drum and the sprocket. This washer must be carefully removed, and then put back, in case of replacement, it must be replaced with an identical one;
- the spring is not subject to contraction, therefore, if it breaks, the part is considered damaged and is replaced with a new one. The absence of a working spring will lead to a lack of lubrication on the chain.
How to unscrew the clutch on a chainsaw with your own hands:
How to change the clutch on a chainsaw?
Owners of chainsaws have probably wondered more than once. how to change the clutch on a chainsaw? On most models of chainsaws, dismantling and replacing the clutch can be easily done manually by the owner himself; on a small number of models, the drum can be unscrewed only in a workshop (such chainsaws include, for example, Husqvarna 137 or Partner 351).
In this review, we will learn how to independently remove and change the clutch on a chainsaw, when to do it and what tools you may need.