How to assemble a clutch on a Chinese chainsaw

How to remove a clutch from a chainsaw: a detailed report

assemble, clutch, chinese, chainsaw

Chainsaw Clutch replacement

The clutch repair process consists of the following operations:

  • dismantle the chain set, air filter flaps and the clutch itself;
  • lock the crankshaft. for this it is enough just to unscrew the ignition cut;
  • unscrew the clutch with a special wrench with strong movements clockwise or counterclockwise (different saw models can have both left and right threads). Usually the tool for removing the clutch is included with the chainsaws;
  • go to disconnecting the drum and sprocket;
  • if, when inspecting the clutch, one or more cracked springs were found (there may be several of them, for example, for Husqvarna chainsaws. 3 units), the failed spring needs to be replaced with a new one;
  • assemble the clutch on the chainsaw, put it in place and screw it in. Remember that the crankshaft must still be stationary;
  • mount the removed parts on the saw in the reverse order to disassembly;
  • fix the clutch. move the auxiliary brake handle forward, start the device and carefully remove from the inertial brake.

Chainsaw clutch replacement and repair

Chainsaw clutch malfunctions are one of the most common failures of this technique. The question of how to remove the clutch on a chainsaw at home correctly and not harm the tool is thought not only by inexperienced technicians, but also by specialists who have repaired it more than once. This is due to the fact that the clutch is an important key element of chainsaws of any power class and brand, on which their serviceable, long-term and successful operation depends.

In cases where gasoline cutters start to start badly, slip instead of starting, checking the clutch for faults is mandatory, recommendations regarding which will be presented further.

The device and principle of operation of the clutch of chainsaws

Modern chainsaws are equipped with centrifugal clutches. This means that their work entirely depends on the torque of the motor, which the saw gives out at a particular moment in time.

Its main structural elements are:

  • drum;
  • star;
  • springs.

The principle of operation is as follows. When the saw is started, elements that move freely in the radial direction are pulled together by springs to the shaft axis. In this case, the torque does not go to the drum, which means to the sprocket and the guide. At the moment when the centrifugal force prevails over the force potential of the springs, the clutch elements weaken and compress at the inner part of the drum, initiating its torsion. Together with it, the rotational cycle goes to the sprocket and the tire-chain set itself.

The main advantage of this type of clutch is its slippage when the cutting part is suddenly braked, which does not stop the engine. As a result, the “heart” of the saw. the motors remain safe and sound.

Clutch repair: the nuances of the process

When servicing clutches yourself, you need to know that:

  • several saws have a washer that sits between the sprocket and the clutch and the sprocket and the motor. Consider this when repairing;
  • the special spring of the oil pump drive must not be damaged during disassembly, and must also be returned to its original position. Otherwise, the chain will receive less lubrication or no longer lubricate at all.

The tool that has been repaired must be checked for the reliability of the bolt ties, the supply of lubricant to the chain and the serviceability of the motor (it should turn on smoothly and work smoothly). Only then can it be exploited.

The device and principle of operation of the clutch of chainsaws

Modern chainsaws are equipped with centrifugal clutches. This means that their work entirely depends on the torque of the motor, which the saw gives out at a particular moment in time.

Its main structural elements are:

  • drum;
  • star;
  • springs.
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The principle of operation is as follows. When the saw is started, elements that move freely in the radial direction are pulled together by springs to the shaft axis. In this case, the torque does not go to the drum, which means to the sprocket and the guide. At the moment when the centrifugal force prevails over the force potential of the springs, the clutch elements weaken and compress at the inner part of the drum, initiating its torsion. Together with it, the rotational cycle goes to the sprocket and the tire-chain set itself.

The main advantage of this type of clutch is its slippage when the cutting part is suddenly braked, which does not stop the engine. As a result, the “heart” of the saw. the motors remain intact and safe.

How to remove a clutch from a chainsaw: a detailed report

The clutch repair process consists of the following operations:

  • dismantle the chain set, air filter flaps and the clutch itself;
  • lock the crankshaft. for this it is enough to simply unscrew the ignition cut;
  • unscrew the clutch with a special wrench with strong movements clockwise or counterclockwise (different saw models can have both left and right threads). Usually the tool for removing the clutch is included with the chainsaws;
  • go to disconnecting the drum and sprocket;
  • if, when inspecting the clutch, one or more cracked springs were found (there may be several of them, for example, for Husqvarna chainsaws. 3 units), a failed spring needs to be replaced with a new one;
  • assemble the clutch on the chainsaw, put it in place and screw it in. Remember that the crankshaft must still be stationary;
  • mount the removed parts on the saw in the reverse order to disassembly;
  • fix the clutch. move the auxiliary brake handle forward, start the device and carefully remove from the inertial brake.

How to remove and change the clutch on a chainsaw with your own hands

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

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:

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. “.

Recommendations for replacing the clutch on a chainsaw

In addition to the basic rules of work described in the previous section, it is worth remembering some of the nuances when replacing the clutch. Use only original parts from the manufacturer. this is the key to a long and productive tool performance. The clutch thread on all chainsaws of any manufacturer is always left-handed. Before removing the coupling, carefully remove all dirt and dust from the tool so that it does not get inside. When reassembling, remember to replace all small parts, including washers and bearings. Watch out for the installation of a special spring (it is not in all chainsaws). if it is incorrectly installed, oil will not be supplied to the saw bar.

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

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

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

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

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

Alternative solutions

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

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

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

Chainsaw clutch replacement. Recommendations and video reviews

Carburetor, muffler and ignition coil

To remove the carburetor, you must have a head 8 and an extension, with which it is convenient to unscrew the nuts securing the carburetor and air filter. Before dismantling the carburetor, it is necessary to disconnect the ignition wire and the choke rod from the engine control lever and remove the lever, only after that the air filter and carburetor are removed.

The Stihl 180 muffler is attached with two nuts, by unscrewing which you need to pull it towards you, it can be easily removed.

How to Re-assemble a Chain Saw Clutch

The coil is mounted on two screws, to remove you just need to unscrew them.

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.

Removing the starter

At the next stage, the upper case cover is removed and the 4 starter mounting screws are loosened, after which it is necessary to remove the oil tank and fuel barrel covers. The starter is removed quite simply and there should be no problems.

After removing the starter, the opened inner cavity of the chainsaw must be cleaned, since usually there is a large amount of compressed small sawdust on the body under the starter.

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.

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.
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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.

Chainsaw clutch replacement. Recommendations and video reviews

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.

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:

Dismantling the chainsaw clutch

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. “

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

The device and principle of operation of the clutch

The chainsaw device includes a clutch mechanism, which consists of elements such as:

  • crankshaft;
  • driven disc;
  • pressure disk;
  • protective cover of the mechanism;
  • release lever;
  • bearing;
  • inclusion plug;
  • crankcase;
  • gears;
  • pipeline;
  • fasteners.

At minimum revolutions of the power unit, the chainsaw clutch is attracted to the center of the shaft by a spring device and does not transmit torque to the drum. At a time when the engine speed begins to reach indicators at which the breakout force exceeds the force of the spring device, the friction-type segments begin to press against the inner surface of the drum mechanism, which contributes to the rotation of the drum of the Chinese chainsaw.

During this, the sprocket of the driving type begins to rotate, which is responsible for the movement of the saw chain.