How to remove the clutch from a Chinese chainsaw

1st May 2021

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.

Chainsaw Clutch replacement

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.

Chainsaw clutch

The woodworking device’s clutch is centrifugal and engages automatically 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 an increase in 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. So 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 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.

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 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.

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.

In order to independently repair such chainsaws as Stihl, Husqvarna, Partner, Goodluck, you need to know some of the features of the models. For example, on some types of saws, a washer is installed (between the drive sprocket cup and the engine). During assembly, it must be installed in its original place.

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. The main reason for the replacement is the wear of the sprocket teeth 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.

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.

Unscrew 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.

How to remove the clutch from a Chinese chainsaw

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 is 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 towards 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 of it;)

Now you can unscrew the nut on the clutch. The most important thing to remember: the thread is left, to unscrew it you need to turn the key clockwise. The key that comes with the saw is suitable as a tool. It is not recommended to unscrew the clutch with a chisel and hammer. knock off the edges. This is an extreme measure.

Next, remove the clutch and drum with a driving sprocket.

Assess the condition of the needle bearing.

Assembly is carried out in reverse order.

Some nuances to be aware of:

Malfunctions and repairs

Do-it-yourself repair of the chainsaw clutch is carried out only in special protective clothing: a mask and glasses.

The main malfunctions, their causes and remedies:

If the chain mechanism constantly rotates during unstable operation of the power unit. This could be caused by a broken spring. In this case, it is recommended to replace the damaged mechanism with a new one.
During the movement of the chain, extraneous noise is heard. This problem could be due to overheating of the knuckle or a broken spring. It is necessary to conduct an external inspection of the system and replace all worn out elements.
If the breakdown is due to the fact that the hitch often slips, you need to completely replace the mechanism.

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). you need to replace the broken spring 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.

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:

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.

When to remove the clutch

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

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

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

If the load on the tool exceeds the recommended load, the clutch will weaken or completely stop transmitting torque to the tire. This will stop the engine. If such situations arise, the clutch wears out, therefore, over time, it needs to be replaced. In the instruction manual for the chainsaw, 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:

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.

Stihl chainsaw clutch repair review

Chainsaw clutch replacement review

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 repairs, 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, replace with an identical one;
the spring is not subject to contraction, therefore, if it breaks, the part is considered damaged and 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 remove and change the clutch on a chainsaw with your own hands

Many users are interested in the question of how to remove the clutch on a chainsaw. This will require special tools and a repair manual.

Chainsaw clutch remover

How to assemble

In order to assemble the mechanism back, it is necessary to install the clutch in place and fix it with a special handle. The saw motor must be turned off at this moment.

Then the spring device, drum mechanism and sprockets can be replaced.

Then you can install the clutch mechanism back into the tool body, remove the crankshaft from the stopper, install the filter mechanisms, the throttle valve and the step with the chain in place.

At the end of the work, it is recommended to start the chainsaw and check the performance of the assembled clutch. If all parts are installed correctly, the clutch will engage immediately, there will be no delays or leaks.

Clutch device, principle of operation

In order to successfully disassemble this unit, you will need a chainsaw clutch puller. But before we look at how to use it, we will study the features of the device of this functional part of the power unit.

Please note that when developing modern chainsaws, manufacturers most often resort to using a centrifugal clutch. And this suggests that the tool and its operation depend on the stock of torque that the equipment produces here and now.

The main structural details of this unit include:

an asterisk;
springs;
drum.

As for the principle of operation, everything is simple here.

As soon as the chainsaw is in working mode, the clutch springs will pull all freely moving elements (move in the radial direction) towards the axis.
At this moment, no torque will be transmitted to the sprocket guide.
As soon as the centrifugal force rises above the force potential of the spring, all freely moving attracted elements will weaken and compress inside the drum, which will start it (it will start spinning).
Rotation will transfer to guide bar and main sprocket.

It is on this principle that the centrifugal clutch works, which has several advantages over its other varieties. Among them is the lack of engine stop when the cutting element is suddenly braked (that is, the clutch slips). Due to this feature of the mechanism, the main unit of the chainsaw remains unharmed.

Please note that this type of clutch will work automatically. Its functioning depends on the number of revolutions of the engine. Moving elements inside the drum will be attracted to the shaft (its center) even at minimum RPM. This plays an important role in preventing serious tool breakage. When this mechanism fails, then it becomes necessary to figure out how to remove the clutch on a chainsaw.

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

crankshaft;
driven disk;
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.

How to change

In order to replace this mechanism, it is necessary to dismantle the old hitch. During repair work, the saw must be securely fixed on a non-slip surface using special devices.

During the dismantling and installation of the clutch, it is recommended to take into account the following nuances of such work:

On some versions of the tool, a washer is located between the hitch and the drive gear cup. Therefore, at the end of the repair, it is necessary to install this element in place.
Some oil lines have a special spring. It is mounted between the sprocket and the oil pump drive. It also needs to be properly reinstalled after replacing the hitch.

When replacing the clutch, we do not recommend using metal or plastic objects as a stopper. The former can scratch the cylinder, the latter can litter it.

Chainsaw centrifugal clutch

Turn on the chain stop brake, remove the protective cover and dismantle the saw headset;
We remove dirt, sawdust, dried grease, if any;
Remove the air filter and candlestick;
Unscrew the candle using a candle wrench;
Rotating the crankshaft, we bring the piston to the top point, then set it back by 6-9 mm;
With a rope, 7-8 mm in diameter, we lock the piston in the upper position;
Unscrew the nut on the clutch with a special key-puller.

Most of the moving parts of the chainsaw have right-hand rotation. Therefore, the nut on the clutch has a left-hand thread. It is necessary to remove the cover by turning the key clockwise. It is forbidden to carry out this operation with a hammer and chisel. you will knock down the edges!

Removing the clutch nut

Remove the cover and drive sprocket. We diagnose faults and assess the wear of parts. Assessing the condition of the needle bearing;
If necessary, we replace parts with new ones (most often the leading sprocket needs it);

The installation of the chainsaw clutch system is carried out in the reverse order, however, you should pay attention to some features.

How to remove

In order to remove and disassemble the clutch, you need to install the chainsaw on a flat, non-slip surface and secure it with fixing elements.

First you need to unscrew the saw chain and bar using the universal wrench. Then you can remove the cover from the air filter element. Then you need to remove the spark plugs, and fix the piston part in the master cylinder.

After that, install a suitable puller and unscrew the clutch.

After the actions taken, remove the clutch drum on the chainsaw and the clutch. At the end, you can conduct an external inspection of the system for damage and defects and, if necessary, replace the failed parts with new ones.

Changing the sprocket on a Chinese chainsaw

Algorithm for self-replacement of the clutch drum with an asterisk

The technology for replacing the leading sprocket provides for the implementation of the entire amount of work in a given sequence:

dismantling the headset and air filter;
installation of a piston retainer in the spark plug hole;
the clutch and the gear drive, made in one piece with the drum, are removed by means of a puller, the sprocket can only be unscrewed clockwise.

If a large cage wear is detected, the springs of the centrifugal mechanism and cams are broken, it is recommended to replace the entire set.

If the condition of the removed parts is not in doubt, the entire mechanism is assembled in 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.

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

The quality of the work done is guaranteed by attention, accuracy, adherence to the sequence of all dismantling and assembly operations

What you need to know to repair a chainsaw with your own hands, and what tools are required

First of all, you need to understand the kinematics of the device. Superficial knowledge of the type: “gas tank, motor, starter cord, shaft, chain” is not enough. Study the technical description of your tool, read specialized literature.

When carrying out warranty service (during this period, it is better to entrust the repair to the service), do not hesitate to ask questions to the masters, try to delve into the device of the chainsaw. over, it is better to do this proactively, without waiting for the first breakdown.

Important! If you know how a chainsaw works, the probability of breakage is close to zero. The owner who “sees” the instrument through and through will not allow an emergency situation leading to the failure of mechanisms. Standard tool for work:

Standard tool for work:

Set of socket and open-end wrenches;
Spanner wrench;
High quality screwdrivers;
Pliers, tweezers, side cutters;
Retaining ring removers;
Soldering iron, tester.

The welding machine is not required, since the breakdown of the case entails the replacement of elements. Even repairing a chainsaw tire with mechanical damage is undesirable.

Important! Since the chainsaw is a dangerous tool, components with cracks, chips, or irregularities in geometry can lead to injury.

Main components and correct dismantling

Different models have different layouts of units, fasteners, etc. Therefore, below we will consider the main points of dismantling certain units.

Before proceeding with disassembly, it is necessary to thoroughly clean the outside of the saw from dirt, smudges of fuel and oil, shavings and sawdust. Drain the remaining fuel and oil from the tanks. Detach the saw head from the saw body. Next, we will consider the dismantling and repair of the main elements.

How a chainsaw works

All types of units are driven by a gasoline petrol engine. During assembly, single-cylinder engines are installed, into which high-octane high-quality gasoline is refueled. Instead of the gearbox, a single-stage transmission is used, which forces the chain to move. The structure of the unit, due to its own simplicity, allows it to work flawlessly in all criteria. 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.

Piston group

This type of repair is due to a drop in engine power. We disassemble the engine, remove the components and carefully lay them out. We look at the wear and cracks of the piston, valves, cylinder walls, bushings and connecting rod. Usually, all component parts are replaced. Replacement of oil seals is also necessary.

The above are the main capacious and complex types of chainsaw repair. But they do not present much difficulty either. You can fix almost anything, you just need your desire and diligence.

The principle of operation of the centrifugal automatic clutch of the chainsaw.

When the chainsaw is idling, the clutch weights, although spinning together with the crankshaft, do not touch the clutch drum (popularly, the clutch cups) because they are tightened by a spring and, accordingly, do not transmit torque from the motor to the saw headset. When the engine speed reaches 4000 rpm, the clutch weights under the influence of centrifugal force are unclenched and resting on their own outer friction surface against the inner surface of the clutch drum, they begin to twist it, thereby transferring the torque from the motor to the saw headset. When the chain stops abruptly during operation (for example, it is jammed), the clutch will not allow the engine to stall, because the friction weights at high speeds will slip in the drum, and at speeds below 4000 the weights will already be compressed by the spring.

Classic chainsaw layout

Almost all professional and amateur chainsaws are equipped with air-cooled two-stroke gasoline engines.

Husqvarna Chainsaw Key Components

Removing the clutch from a 45cc Chinese chainsaw (Baumr SX45)

This assumes the presence of at least one cylinder with heat sink fins. The fuel supply system (carburetor) acts as a gasoline-air mixer. Dirt, dust, shavings must not enter the working combustion chamber together with the fuel mixture, and filters are installed on the saws to clean the supplied air. Manufacturers recommend changing the filter once a season. In the interval between replacements with a frequency of once for 10-15 fillings, it must be cleaned.

For convenience and ease of starting the internal combustion engine in any chainsaw, a starter is provided, which is a reel with a wound cable and a handle. Even the most powerful husqvarna chainsaw is equipped with an intelligent starting mechanism.

In order to reduce the vibration transmitted to the hands of the feller, a special device is installed on the tool. In addition, this mechanism prevents the tire from “pulling” during the sawing of wood.

Chainsaw piston group

The dimensions of the cylinder-piston group are determined primarily by the diameter of the piston made of heat-resistant aluminum alloy. Regardless of the model, the CPG of the chainsaw consists of a cylinder, a piston, a retaining pin and two retainers.

Chainsaw cylinder mirror

In order to increase compression in the working unit and, as a result, increase power, many manufacturers install two piston rings each. Chainsaw compression rings made of special cast iron adhere tightly to the cylinder, which ensures the tightness of the combustion chamber.

Sources:

http://www.echo-tools.ru/blog/how-to-remove-grip-on-the-chainsaw/
http://sawcutter.ru/index.php/p1/24-benzopila-kak-otkrutit-stseplenie
http://vdartebe.ru/benzopila/razborka-stsepleniya-benzopily.html
http://vseopilah.ru/gazonokosilki/semnik-stsepleniya-benzopily/
http://dibroff.ru/mebel/remont-benzopily-svoimi-rukami.html

Chainsaws chainsaw, chinese, clutch, remove