How to remove the clutch on a Husqvarna 142 chainsaw

How to remove the clutch on any brand of chainsaw

One of the most important parts of any device model is the clutch. This mechanism requires constant monitoring of the correct operation. It must be removed periodically for inspection and necessary repairs. How to remove the clutch on a chainsaw of any brand correctly and how it works, we will figure it out below.

remove, clutch, husqvarna, chainsaw

Chainsaw clutch

The woodworking device’s clutch is centrifugal and automatically engages when the engine speed changes. If the revolutions are small, then the elements of the mechanism are pressed against the shaft. This way, the rotary motion is not transmitted to the sprocket. With increasing speed, the elements diverge and press against the drum, thus forcing the chain to rotate.

A characteristic feature of this type of device is braking when the chain decelerates. This way it turns out to avoid some breakdowns. But nevertheless, this system is subjected to enormous stress, therefore, it is necessary to systematically carry out preventive inspection and repair.

How a chainsaw works

All types of units are driven by a gasoline internal combustion engine. During assembly, single-cylinder engines are installed, into which high-octane high-quality gasoline is refueled. Instead of a gearbox, a single-stage transmission is used, which makes the chain move. The structure of the unit, due to its simplicity, allows it to work flawlessly in any conditions. The device of the unit consists of the following parts:

  • Single-cylinder internal combustion engine;
  • Gas tank;
  • Carburetor;
  • Crank mechanism;
  • Clutch;
  • Saw chain and sprocket that drives it.

In addition, there are such components:

  • Air purification system supplied to the carburetor;
  • Ignition mechanism;
  • Exhaust suppression system;
  • Emergency shutdown system, triggered in emergency situations.

In the photo you can see a variety of models from manufacturers Stihl, Husqvarna, Partner, Goodluck.

How the chainsaw engine works

In devices released recently, a single-cylinder two-stroke carburetor-type engine is installed. It includes several mechanisms that work harmoniously. The main components of the engine:

  • Flywheel;
  • Coupling;
  • Incendiary module;
  • Muffler;
  • Mounting sleeve.

How to Replace the Clutch on a Chainsaw

The engine installed in the saw operates at 13.5 thousand rpm and therefore requires high-quality oil treatment. A high level of system cooling is required during operation. The engine of the unit is equipped with a cooling system that delivers air to cool the systems.

How to remove

The drive sprocket also serves as a drum. One of the main reasons for this block to break is the grinding of the sprocket teeth. In the monolithic version of the drum, the chain can cut through the sprocket during operation. This mechanism needs to be replaced. If the drum has a replaceable ring, it must be removed and replaced during service. The drum can then continue to function.

When there is a need for repairs, you need to contact the service center, where experienced specialists work. But if there is none nearby, the question arises. how to remove the clutch on your own? If you have the necessary set of tools, you can easily implement your plan. Of course, there are some differences in the models of different companies, but the disassembly scheme remains unchanged:

  • First, remove the chain brake cover by turning the lever. Unscrew the nuts slightly to loosen the chain tension. After loosening, you can completely unscrew the nuts and remove the cover;
  • The chain and guide bar are disassembled, as well as the mechanism is cleaned from dirt;
  • The cylinder head plug is unscrewed and the piston is fixed. To do this, the crankshaft should be rotated until the exhaust hole closes, and then a piece of rope is placed in the cylinder to lock the piston. After completing the work, the rope is removed from the mechanism;
  • The nuts on the clutch are unscrewed with a special wrench from the kit. In this mechanism, they are made with a left-hand thread, and this must be taken into account when dismantling. After that, the mechanism is disassembled, and all its parts are inspected for damage. Worn parts must be removed and replaced with new ones.

After repairs and replacement of parts, it is necessary to reassemble in the reverse order. In more detail, the disassembly process is presented in the video.

If the model has a special spring that transfers rotation to the pump drive, then it is extremely important to correctly install it after repair. Otherwise, the device could be seriously damaged. After preventive and repair work, it is necessary to check whether the mechanisms are working properly.

How to remove the clutch on a chainsaw

The clutch drum of the chainsaw, also known as the drive sprocket, is a consumable item, so it needs to be replaced periodically. Main reason for replacement: Sprocket teeth are worn out by the saw chain. If the drum is monolithic, then during long-term operation the chain simply cuts through the sprocket and you need to change the entire drum. On some chainsaws, the clutch drum has a replaceable ring, which also wears out. In this case, only the crown changes, the drum, if it is in good condition, is left for further operation.

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Many saw owners do not think about how to remove the clutch on a chainsaw on their own, because they have the opportunity to contact a service. But not everyone has such an opportunity, for this we publish this article, in which we will explain step by step how to remove an asterisk from a chainsaw.

This operation is not difficult at all if you have the necessary tools and parts at hand. In the article, for example, all actions are performed with the Echo CS-3500 chainsaw, all operations for replacing the clutch drum for other chainsaws are similar.

  • First you need to remove the saw headset: unscrew the tire cover nuts with a standard universal wrench, and remove the tire and chain.
  • Remove the air filter cover.
  • Using the standard universal key, unscrew the candle.
  • To fix the piston in the cylinder, instead of a candle we screw in the piston stopper.
  • We take the clutch remover for this model of the chainsaw, and install it in the universal wrench.
  • Turn off the clutch clockwise.
  • Removing the clutch.
  • Removing the clutch drum.
  • We change the clutch drum or wreath for a new one, check the condition of the clutch separator. Putting the chainsaw in reverse order.

When the coupling needs to be replaced

Removal and replacement of the chainsaw clutch is carried out in the event of a mechanism malfunction. Such malfunctions include:

  • Damaged spring. Depending on the tool model, the spring can be of two types. coiled (tape or single) or steel plate. The spring is damaged by stretching, disconnection, or mechanical defect. To determine the cause of the malfunction of the entire mechanism, you will need to remove the protective cover and drum
  • Drum damage and depletion. Breakage of this part is often associated with chipping off pieces. In case of such a malfunction, you will need to replace the drum. The inner part of the drum also wears out, so the part also needs to be replaced. If the drum is blue, it means that it has been overheated and should not be used further.
  • Development of the mechanism. It is primarily associated with the stretching of the spring, which can be replaced. The threaded connection also wears out. With such a breakdown, you will need to replace the entire clutch.
  • Sprocket wear. Depending on the type of sprocket (collapsible or non-collapsible), it is replaced together with the drum and, if necessary, the clutch

The service life of the clutch mechanism depends not only on the quality of the components, but also on the correct operation of the tool. To extend the service life of the chainsaw clutch, you need to pay attention to signs that reduce the resource. These features include:

  • Frequent seizing or biting of the chain in wood. In such situations, the clutch takes over the entire load, thereby protecting the engine from seizure.
  • It is forbidden to increase the speed when the handbrake is on, which also leads to wear of the mechanism due to overheating
  • The use of low-quality oil, the wrong choice of tires, chains, etc. All this also affects traction, increasing the load, and thus reducing the service life.

Determining the malfunction of the device is quite simple. To do this, you need to cut the workpiece. If during the sawing process there is a decrease in the speed of rotation of the chain or it stops when the load increases, then it is time to check the grip. How to remove and replace the clutch on a chainsaw, we will consider in detail in the next section.

Repair kit, required tool

In order to remove, disassemble or adjust the clutch, we need the following tools:

Dismantling the chainsaw clutch:

What does adjusting the clutch of a chainsaw mean and how to do it

If you have heard that the clutch on a chainsaw needs to be adjusted, then the question must have arisen, how to do this? On a chainsaw, the clutch does not need to be adjusted, since it works in automatic mode, unlike the devices of old brands of tools. It is impossible to adjust the compression force of the spring or springs, and if this part is damaged, then it should be replaced.

When the chainsaw clutch is installed in place, then nothing needs to be adjusted either. The clutch is tightened to the stop using a special wrench and a locked piston in the cylinder. Some chainsaw models have a washer or spacer bar. It can be located between the shaft and the sprocket, or the drum and the sprocket. This washer controls the centering of the sprocket with the tire. If there is such a washer on the chainsaw, then it must be put in its place when repairing or replacing the mechanism.

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How the clutch mechanism is removed and adjusted on Ural and Druzhba chainsaws is shown in detail in the video clip.

To summarize, it should be noted that the clutch on a chainsaw plays an important role. This mechanism not only ensures the transfer of torque from the engine to the chain, but also protects the motor from premature failure. Imagine a situation where the sprocket is rigidly connected to the crankshaft. If the chain gets stuck in the material to be cut, the engine parts, sprocket and chain will wear out at the same time. Understanding the purpose and principle of operation of the mechanism, you must always monitor its serviceability, and at the first signs of breakdown, remove, repair or even replace.

Removing and replacing the clutch on a chainsaw. Overview, instruction

Vladimir Khlestov, 44 years old, Armavir

“After six months of operation, the chain on the chainsaw began to spin constantly. I decided that there were problems with idling. No carburetor adjustments helped. They took it apart in the workshop. it turned out that the spring on the clutch had burst. They changed everything in 10 minutes, and for two months I could not find a fault. The main thing is the correct diagnosis of the malfunction. “

Yaroslav Nedelko, 31 years old, Vinnytsia region

“I cut mainly hardwoods. Quite often you have to sharpen the chain, and the drive sprocket wears out. The first time I removed the clutch. I had to sweat. The metal stuck tightly. it does not unscrew. Sprinkled with kerosene. did not help. Only after using it in Deshki was it possible to disrupt. And all because the oil was leaking somewhere, so the coupling was welded to the sprocket. I think so.”

Andrey Kosoglazov, 23 years old, Primorsky Territory

“After three months of using the chainsaw, a longitudinal groove appeared in the sprocket. everything works, but the chain does not rotate. They said that the problem is in the clutch. It is not at all difficult to disassemble it, the main thing is to find a puller and do not forget that the coupling nut has a left-hand thread. In short, I unscrewed and changed everything without any problems. It works perfectly, and there was nothing complicated there, only it is necessary to be careful. “

The design and principle of operation of the chainsaw clutch mechanism

Most sawers do not understand how the chainsaw clutch works. When working, it is not necessary to know the principle of functioning, but when malfunctions occur, then in order to eliminate them, you will need to find out the design and features of the chainsaw clutch.

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Modern chainsaws are equipped with centrifugal clutch mechanisms. Centrifugal clutch. This means that its performance depends on the torque of the engine. The main purpose of the clutch on a chainsaw is to ensure the transmission of torque from the engine crankshaft to the saw headset (chain). The device works in automatic mode, and how it happens, we will find out in detail.

The clutch mechanism consists of the following structural elements:

  • Drum with removable or non-removable sprocket. is a transmission mechanism
  • Friction linings. move under the influence of centrifugal force, engaging with the drum
  • Spring. ensures that the linings are pressed against the crankshaft

Now about the principle of the chainsaw clutch. When the tool’s two-stroke engine starts up, the crankshaft starts to rotate. A coupling is attached to the shaft, to which the chain is connected using an asterisk. When the chainsaw is idling (shaft rotation speed up to 2700 rpm), that is, the accelerator trigger is not pressed, the spring presses the friction linings, as a result of which the torque is not transmitted to the drum.

As soon as the sawman picks up the tool and starts to increase the speed (maximum up to 14000 rpm), the chain starts moving along the tire. This happens due to the fact that the speed of rotation of the crankshaft increases. Due to the inertial force, the friction pads (also called counterweights) move and engage with the inner walls of the drum. As a result, the drum moves, which is connected to the sprocket. The rotating sprocket drives the chain.

The principle of operation of the mechanism is simple, due to its simple design. If this part fails, then the chainsaw will not work accordingly. A detailed description of the principle of operation of the chainsaw clutch mechanism is described in this material.

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.
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How to unscrew the clutch on a chainsaw with your own hands:

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.

Why Husqvarna chainsaw stalls when you press the gas

If the saw stalls immediately after pressing the gas, it is necessary to inspect the spark plug, which will help to more accurately diagnose the malfunction. A wet candle indicates a malfunction or improper adjustment of the carburetor, in this case, the situation can be corrected by carrying out a full diagnosis, repair and adjustment of this unit. If the repair and adjustment did not help, it is necessary to replace the carburetor with a new one.

Another reason why Husqvarna can stall when you press the gas is a malfunction in the fuel system, or rather, difficulty in supplying fuel to the carburetor. It is necessary to check the cleanliness of the fuel filter, as well as the integrity of the fuel hoses.

In the process of assembling the chainsaw when carrying out its complete repair, you can pinch the fuel hose from the tank to the carburetor, which will limit or completely stop the fuel supply and make the saw impossible.

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Oil pump

On Husqvarna, the oil pump is installed on the right side of the chainsaw. It can be removed only after the clutch is untwisted. No special tools are required for removal. the fastening screws are made for a regular Phillips screwdriver. After the screws have been unscrewed, it is necessary to lift the pump and disconnect the oil hoses from it.

Clutch malfunctions

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.

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.

Why the chain on the Husqvarna chainsaw is not lubricated

If your chainsaw completely stops supplying saw chain lubrication, then you need to check the entire oil system.

There may be several reasons:

  • Malfunction of the oil pump;
  • Clogged filter element installed in the tank;
  • Oil tank breather malfunction;
  • Oil hose rupture;
  • Mismatch of the oil hole on the bar and on the saw body (if the feed has stopped after installing a new saw bar);
  • Clogged oil channel in the saw body;
  • Clogged oil supply channel in the tire;
  • Oil pump drive gear malfunction.

Self-repair of Husqvarna chainsaws is possible only if you have at least some knowledge of the operation of a two-stroke engine, as well as the principles by which a chainsaw is arranged. As practice shows, it is not difficult to disassemble a Husqvarna chainsaw, it is much more difficult to assemble it and at the same time not to aggravate its malfunction. Calculate your strength in advance and do not expect that you will be able to repair the saw without some experience. In some cases, even experienced craftsmen make a lot of effort to correctly diagnose a malfunction.