How to assemble the clutch clutch on a chainsaw

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

You can replace the sprocket on a chainsaw not only in the service, but also with your own hands. The entire process is relatively simple, the repair will require:

• candle wrench;
• a wrench to remove the clutch (an ordinary bolt wrench for a nut will also do, but it is desirable that it is thicker);
• piston stopper (a special tool, but it can be replaced by a thick cord);
• An adjustable wrench/wrench (may not be needed).

Replacement of the drive sprocket and chain starts with fixing the piston in the chainsaw cylinder. To do this, remove the upper housing cover, the air filter, and unscrew the spark plug. In this hole install a special piston stopper, but among the masters it is not in great demand: metal can scratch the piston, and plastic. to break and get inside. Most often instead of it take an ordinary thick cord or wire length of about 10. 15 cm

It is important that there is no debris or metal wires sticking out of it, all of which can get into the cylinder

Remove the cover on the side of the chainsaw where the guide bar is attached. It is usually secured with two bolts and two nuts. They can be unscrewed manually or with a wrench or universal wrench. To loosen the tension of the chain to immediately remove it and the saw bar. At the same stage you should perform external cleaning of accumulated dust, sawdust.

Depending on chainsaw design, the sprocket can be located either under the clutch drum (alone or as a part of it) or on top of the clutch. In the second case it is easier. remove the part and replace it with a new one.

Under other circumstances the assembly must be disassembled. The clutch has a left-hand thread, so unscrew it clockwise with a special or a wheel wrench, remove the drum, then you can remove the sprocket. If the chainsaw has been in use for a long time, the parts can become very sticky. In such a situation, physical force may be required, but never use a hammer or chisel. this will destroy the entire assembly.

Carry out an initial inspection of all components for wear and deformation. Then you can proceed to repair and take on the replacement of the sprocket on a chainsaw. If it is a part of the clutch drum, then the whole part must be replaced. An important point is the selection of a new part. it must be similar to the original.

Construction principle of the clutch drum

A chainsaw is a unit that is equipped with a drive sprocket, and is a single complex that has a clutch basket. Such units are fitted with a centrifugal type of clutch, which is triggered automatically, based on how many revolutions the engine has.

The drums, which are the basis of such clutches on the machine mechanism, are considered as integral parts of the chain drive systems. Such parts are similar to a star in shape, which is how they got their name. Depending on what chainsaw is considered, these parts are divided into professional and domestic. Since professional chainsaws are used more often than home saws, the replacement of the drive sprocket in the tool should be more frequent. Considering household tools, it is worth noting that the frequency of replacement parts is affected by the amount of work performed and the loads that affect the unit’s chain.

But in either situation, the main reason the sprocket needs to be replaced is because the teeth on which the chain is riding are worn. If there is a monolithic drum in the device, the chain cuts through it actually, and therefore it needs to be completely replaced. If, on the other hand, the units are fitted with drums that have replacement crowns, then it is only enough to perform the replacement of the crown itself.

As a rule, if it is necessary to remove the chain saw sprocket, many tool owners use the services of specialized service centers, but to save the family budget, such replacement can be performed independently. The implementation of this task is not difficult, but it requires the right parts and tools. The sprocket replacement for each chainsaw model is done in the same way.

How to remove the clutch on a chainsaw

Most modern chainsaws are equipped with a centrifugal clutch. The operation of these mechanisms directly depends on the torque created by the engine.

The centrifugal clutch consists of a spring, a sprocket and a drum. These elements work together according to a fairly simple principle. When the petrol engine starts, the freely movable parts in the radial direction are pressed against the drive shaft by the springs.

No rotational force from the engine is transmitted to the drum, drive sprocket or guide bar. The centrifugal force pressure gradually increases and displaces the force created by the springs. At that point, the clutch components lose their force and begin to compress near the inside of the drum. The drum starts to unwind under the action of the springs. When it moves, it transmits the rotation to the drive sprocket and the chain saw’s headset.

The main advantage of the centrifugal clutch is its instantaneous slippage at the moment when the cutting units start to rotate more slowly. The chainsaw engine itself does not lose its original speed and continues to run as smoothly as before. This reduces fuel costs and the risk of burr formation in the chainsaw motor.

Modern chainsaws are equipped with centrifugal clutches. This means that their operation depends entirely on the motor’s torque, which at a given moment in time is produced by the saw.

Its main structural elements are:

The principle of operation is as follows. When the saw starts up, the elements, which move freely in a radial direction, are tensioned against the axis of the shaft by springs. In this case, torque is not applied to the drum, and therefore to the sprocket and guide rail. The moment the centrifugal force prevails over the force potential of the springs, the clutch elements loosen and compress at the inside of the drum, initiating its torsion. Together with it, the rotation cycle is transferred to the sprocket and the chain bar itself.

The main advantage of this type of clutch is its slippage during sudden braking of the cutting part, which does not stop the engine. As a result, the “heart” of the saws. the motors remain intact.

Chainsaws, for a variety of reasons, occasionally need repair. Of course, you can go to a service shop or an experienced mechanic. But many troubleshooting is possible at home with minimum skills and tools.

Answering the question how to remove the clutch from a chainsaw, we note that it is not a complicated operation, if exactly adhere to the technology of disassembly.

The owners of the tool may face certain difficulties, if the chainsaw has been in use for a long time, and the clutch parts are stuck to each other.

But even in this case it can be dismantled with your own hands.

For many chainsaw owners, the question of removing the clutch on a chainsaw has more than once become urgent. Many chain saws, despite their multifunctionality and high performance, have simple designs that the owner can disassemble and reassemble on his own. In particular, this applies to the clutch, which on only a few models can be repaired in specialized centers.

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How to change the clutch on a chainsaw?

Chainsaw owners have probably wondered more than once. how to change the clutch on a chainsaw? On most chain saw models the clutch can be easily removed and replaced manually by the owner, on few models unscrewing the cylinder can only be done in the workshop (these include, for example, Husqvarna 137 or Partner 351).

In this review, we will learn how to remove and change the clutch on a chainsaw yourself, when to do it and what tools may be needed.

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Causes of failure

In regular, hard use, or if you get dirt on the chain saw’s moving parts, the clutch will gradually wear out. Much less often than with a chain, replacement or maintenance is needed. Common faults requiring repair:

• Damaged spring. This may be of the coil type or steel plate type. Deformations appear on this element due to stretching, mechanical damage. Drum removal is required.
• Damaged and worn drum. Such malfunction can be determined by the appearance of the clutch mechanism. there are chips, cracks and damage. Blue discoloration on the metal surface could indicate overheating.
• Clutch failure. Usually the threaded joints wear out or the springs get stretched. The entire coupling must be replaced.
• Wear on the sprocket. Changing and correcting the sprocket is a routine part of chain saw service.

It is not just the quality of parts that ensures long clutch life, it is also the correct way to use your chain saw. Avoid jamming the chain in the wood, use old and waste oil. In addition, it is not recommended to increase the rpm when the handbrake is on. The easiest way to spot a defect in the mechanism is by sawing a small piece of wood. If you notice a decrease in chain speed or chain stopping, you should check the inside of the tool.

Mixing fuel for two-stroke engines

The video shows how to make a fuel mixture for two-stroke engines. STIHL chain saw oil). How much oil to add to your chain saw? Filling up your brushcutter, chain saw

The application of catalytic afterburning of exhaust gases, E-TECH technology, reduces their toxicity, is approved for use in all countries and allows for a qualitative improvement in working conditions. What kind of gasoline to use?? How to thin a chainsaw with gasoline? (Husqvarna). It is to be commended that Husgvarna has always put the improvement of working conditions with its tools at the forefront. The 1959 saw had the lowest noise level, compared to other saws, and starting in 1973, all saws have an automatic chain brake to keep the operator safe in the event of backfire. Modern chain saws use a combination chain brake that stops the chain both manually, by pressing your hand into the flap, and automatically by the force of the chain’s inertia. What oil to use for what oil to put in your gasoline and Husqvarna for. Many manufacturers, in order to prevent the occurrence of blowback, exclude the possibility of working with the toe of the saw and install a limiting shield. But not on Husqvarna saws, because Swedish safety standards allow for operation with the end of the guide bar. Gasoline to oil ratio for chainsaws: how and how to dilute gasoline for chainsaws? In Russia only first-class sawyers are allowed to work in this way.

In 1969, Husgvarna introduced a low-vibration chainsaw and since then its saws have been fitted with anti-vibration systems, which have been progressively improved with each new model. Today the company installs the LowVib vibration damping system on its saws, the principle of which is to counterbalance one mass with the other, the inertial interaction of the two masses. Parts of chain saw are isolated from handles by steel springs, and total weight of handles is counterweight. But keep in mind that the quality of the vibration dampening on domestic saws is lower, because their operating time is much shorter than that of professional saws. Double air filtration is not uncommon, allowing you to increase sawmill and engine performance by reducing the time it takes to service the chainsaw. How to correctly refuel a chainsaw preparing the fuel what gasoline for. How to dilute gasoline for a chainsaw? The narrow body, high center of gravity, and flat bottom make the Husgvarna chain saws convenient and comfortable to operate.

And the last piece of advice is valid for all chainsaws without exception. Don’t forget that statistics show that around 90% of all saw breaks are a result of neglect of the saw headset and the chain. If the chain is sharpened, it works, and if not, the person. You put more effort into your sawing, increasing the load on your chainsaw, reducing the motor’s life and the entire life of the unit.

Husqvarna petrol chain saws are in great demand among garden beginners and experienced woodcutters alike. The Swedish brand offers big advantages like reliability, balance and long service life. Each Husqvarna chain saw has a simple design that makes it easy to service and fix the problem quickly.

To replace the clutch

When replacing the clutch we do not recommend the use of metal or plastic objects as stoppers. The former can scratch the cylinder, the latter can litter it.

• Engage the chain stop brake, remove the protective cap and disassemble the saw headset;
• Remove dirt, filings, dried grease, if any;
• Remove the air filter and candlestick;
• Unscrew the spark plug using a spark plug wrench;
• Rotating the crankshaft, bring the piston to its upper point, then withdraw it to 6-9 mm;
• Using a 7-8 mm rope, stop the piston in its upper position;
• Unscrew the nut on the clutch with a special wrench.

Most chain saw moving parts are right-handed. That’s why the nut on the clutch has a left-hand thread. Remove the cap by turning the wrench clockwise. Do not use a hammer and chisel for this procedure. you could break the edges!

• Remove the cover and the drive sprocket. Diagnose malfunctions and assess component wear. Evaluate the condition of the needle bearing;
• If necessary, replace parts with new ones (most often the drive sprocket needs replacement);

Reassembly of chainsaw clutch system is done in the reverse order, but you should pay attention to some peculiarities.

Nuances of mounting the clutch system:

• Some chainsaw models may have a washer between the drive sprocket and the clutch. Pay attention to which side it faces the motor;
• Some oil pump drives are fitted with a special spring (an auger) which is responsible for transmitting rotary motion from the drive sprocket to the oil pump. It is important to adjust the spring so that it fits into the groove in the sprocket housing with its free end (the hook). Otherwise the saw headset will not be lubricated;

Important: After disassembling and reassembling the clutch, be sure to check the operation of the automatic oil supply system.

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When to remove the clutch

Disassembly of the clutch in order to remove it is carried out in such cases:

• When the spring has burst (the chain will turn, the engine will run erratically);
• the spring has come off;
• a piece of the drum has broken off (in this case you will hear a noise, the chainsaw chain will also rotate);
• Time wear and tear (it is time to remove and replace the clutch because it has used up its life).

Modern chainsaws run on two-stroke engines, which are connected by a reducer to the chain of the saw. The chain runs on the bar and according to the centrifugal principle must remain stationary at idle speed, i.e. it must be safe for the person holding the chainsaw.

If the load on the tool exceeds the recommended load, the clutch will loosen or completely stop transmitting torque to the guide bar. This would cause the engine to stop. When such situations occur, the clutch will wear out, so it needs to be replaced over time. Some manufacturers’ chainsaw instruction manuals have information that the clutch is an expendable part, meaning it must be replaced periodically.

Video. how to remove the clutch on the chainsaw:

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Clutch defects

Malfunction	Possible Cause	How to fix it
Chain does not stop spinning with any carburetor adjustment. The engine is not running smoothly.	The spring in the drum broke.	Remove spring and replace with new one or install a new unit.
Clutch chain is turning almost continuously, making strange noises.	Chipped cam. Spring is loose.	Replace entire assembly
The chain slips when operating.	Clutch wear	Change of the assembly

Reasons why a clutch needs to be disassembled:

• Spring defective or broken;
• As a result of chainsaw loads and component wear, the spring has left its place;
• Chips in the clutch plate;
• Parts Wear.

How to Disassemble the Chainsaw Clutch?

To remove the clutch is not difficult at home, you will need a basic set of tools. screwdriver, spark plug wrench, and puller (comes with the saw), tight rope for the dismantling of the crankshaft. The mechanism for removing and installing the clutch is the same for various chainsaw models.

Important! You can buy a new clutch assembly after you disassemble your chainsaw. You can take an old crankshaft drum with you to the store, so that you do not make a mistake with the choice of necessary spare part.

How to remove the clutch

Step-by-step instructions on how to unscrew the clutch on a chainsaw:

• Unscrew nuts for shroud and guide bar. Carefully remove handbrake, chainsaw headset.
• Remove the plastic cover on the body to unscrew the spark plug. Remove the air filter (you can clean it right away).
• Using a special wrench, unscrew the spark plugs of the chainsaw.
• Put a rope through this hole or install an existing wrench to secure the crankshaft.
• Unscrew the coupling with the coupling puller provided. If it is not available, use a wrench from an angle grinder.
• Rotate the clutch clockwise (there are usually guides), when the piston reaches the dead center, the clutch will disengage.
• Dismantle the mechanism from the chainsaw, remove the drum and sprocket if necessary.

Figure 2. Removing the clutch from the chainsaw

The work to remove the clutch mechanism should be done on a level and clean surface. It is best to prepare the workplace in advance, so as not to lose small parts in the repair process.

How to reassemble the clutch

Reassemble the clutch mechanism in reverse order of removal. When installing it, remember that on some models there may be a washer between the drive sprocket and the clutch and it is important to reinstall it in its original position. In addition, a number of chainsaws are equipped with a fuel pump spring, it is mandatory to insert it into the appropriate slot on the sprocket housing, otherwise the saw headset will not be lubricated.

Important! After finishing work, check the condition of all fasteners and remove the handbrake. Start the chainsaw only at low rpm to check the quality of the assembly and let the oil get to the main elements.

Construction Design

Most brands of these tools are classic devices with simple, equally working mechanisms. The straightforward design allows all kinds of work to be carried out easily, even in difficult conditions, and in the event of faults to be repaired quickly and independently.

High-octane gasoline is used to run the cylinder engines (ICE). Instead of gears, these units have single-stage gears that drive the chains.

Air filters are also installed to supply clean air to the engine. Reliable, no-failure operation is also assured:

• the starter to start the power unit;
• saw headset;
• chain tensioning mechanism;
• An emergency brake for quickly disengaging the tool in emergency situations;
• ignition and exhaust system.

Nuances when replacing the clutch

Different chainsaw models have design features that are important to consider when repairing. Key tweaks:

• Champion. This is an inexpensive brand of saw that has a tendency for the chain clutch to burst during operation. The drum is usually surrounded by a tight band to reduce vibration. Repair of the clutch mechanism does not differ from the traditional scheme.
• Partner. In saws of this brand the clutch covers the sprocket (it is usually removable). When disassembling, it is recommended to immediately replace the crankshaft bearing, which often fails.
• STIHL. Distinctive feature. the threads are only on the left side, and there is an anti-vibration deflector plate behind the clutch assembly. It can break while disassembling the tool, so you need to buy the element before you start the repair. A screwdriver and a 19 mm wrench are mandatory.
• Husqvarna. To disassemble the clutch you may need a 12 mm wrench, which is the easiest way to fix the shaft on the impeller side. Depending on the model the sprocket is either a one-piece drum or a detachable sprocket. Easy disassembly and assembly.

When working with a particular model it is recommended to refer in advance to the manufacturer’s website, where you can find basic instructions for use, diagrams. If you don’t think you can do it yourself, call a service outlet to make sure it doesn’t malfunction after you disassemble it.

The chainsaw clutch needs routine diagnosis and repair. Its proper functioning is essential for productive work of the whole tool and for power of the chain. Prevention and replacement is not difficult to carry out at home, you should follow the exact scheme, based on the manufacturer’s instructions.

What to consider when replacing the clutch?

Different chainsaw models have design features that are important to consider when repairing. Basic Tweaks:

• Champion. This is an inexpensive brand of saws, whose chain clutch tends to burst during operation. The drum is usually surrounded by a dense band to reduce vibration. Repairs to the clutch mechanism are the same as for traditional schemes.
• Partner. In this brand of saws, the clutch covers the sprocket (it is usually removable). When disassembling it is recommended to immediately replace the crankshaft bearing, which often fails.
• STIHL. The distinctive feature is that the threads are left-handed only, and there is an anti-vibration deflector plate behind the clutch block. It can break when you disassemble the tool, so you must buy the part before you start repairing it. Screwdriver and 19 mm wrench are definitely needed.
• Husqvarna. You may need a 12 mm wrench to disassemble the clutch, which is easiest to use to fix the shaft on the impeller side. Depending on the model, the sprocket can be one piece with a drum or removable. There is no need for disassembly and assembly.

When working with a particular model, it is recommended that you refer in advance to the manufacturer’s website, where you can find basic operating instructions, diagrams. If you have difficulty in that you can make repairs yourself, contact the service center. this will save from technical problems after disassembly.

Chainsaw clutch mechanism needs routine diagnosis and repair. its proper functioning is essential for the productivity of the whole tool and the chain’s power of movement. Preventive maintenance and replacement are easy to do at home, just follow the exact scheme, referring to the manufacturer’s instructions.

Possible problems

Regardless of the brand of the manufacturer, the occurrence of malfunctions of the clutch is inevitable due to the enormous stresses placed on this part:

• Wear on the teeth of the drive sprocket. the chain rubs them at high rpm over time.
• Natural wear of assembly when spring breaks.
• A piece of clutch cam splits off on the clutch due to overheating or overloading. Then the spring is off, the chain turns almost continuously, and there is a characteristic noise.

Malfunctions in the clutch

Malfunction	Possible reason	Corrective action
The chain keeps turning without stopping, regardless of carburetor settings. Motor does not run smoothly.	The spring in the drum burst.	Remove spring and replace with a new one, or install a new unit.
The chain is turning almost constantly, making strange noises.	Chipped cam. Spring comes off.	Replace entire unit
When the chain slips during operation.	Wear on clutch	Change unit

Do not rush to replace the entire assembly, since you can correct the clutch malfunction by replacing the defective part. The most common cause of malfunction is the spring, which stretches and can become damaged. A spring that has already been stretched is defective. If the spring is damaged, it can be replaced to make the tool work again. Replacement instructions depend on the design of the mechanism, as the clutch devices come in different types, but they are all subject to replacement. This procedure is not so much complicated as it requires special attention and observance of the sequence of actions. How to replace the spring on the chainsaw clutch is shown in detail in the video clip.

If the friction lining is damaged, it can be replaced. It also needs to be replaced if the screw joint is worn, which can happen if the coupling is frequently disassembled and reassembled. To understand the cause of a defective part, you must first carry out a visual inspection. If the sprocket teeth are worn out, they must be replaced. Fixed sprockets must be replaced with a drum.

This is interesting!The clutch does not have a specific service life, and its life depends on the correct application of the tool.

Design and operation of chainsaw clutch

Modern chainsaws are equipped with a centrifugal clutch. This means that their work is completely dependent on the motor torque, which at a given time is delivered by the saw.

Its main structural elements are:

The principle of operation is as follows. When the saw starts, the components that move freely in a radial direction are tensioned against the axis of the shaft by springs. In this case, no torque is applied to the drum, and thus to the sprocket and guide. When the centrifugal force exceeds the force potential of the springs, the clutch elements loosen and compress at the inner drum causing the drum to torsion. Together with it, the rotary cycle is transferred to the sprocket and the chain bar itself.

The main advantage of this type of clutch is considered its slippage during sudden braking of the cutting part, which does not stop the engine. The result is that the “heart” of the saw. the motors stay intact.