How to put the spring on the chainsaw clutch

Why the clutch on a chainsaw unscrewed, instructions, video, photo,

The clutch is the link between the power unit and the cutting units of the chainsaw. Its main function is to transmit the rotational force generated by the motor to the saw unit. Most modern household and professional chainsaws are equipped with reliable metal clutch parts, but they also fail completely over time. Eliminate the failure of the node can be at home, but for this you need to carefully study the order of disassembly and features of the replacement of clutch elements with your own hands.

Most quality brand name chain saws are initially fitted with a centrifugal clutch. It is distinguished by high reliability, increased service life and works in the automatic mode, that is, independently actuated when the power unit reaches the required rotation speed.

The factory centrifugal mechanism design includes durable friction pads, a chainsaw clutch drum, and steel return springs. The friction plates of the mechanism are able to move radially. They are pulled up against the crankshaft by the springs when the engine is running at low speed. At the same time the original metal drum that is originally connected to the cutter chain sprocket is set in motion. If the engine speed is high enough, the tension of the built-in springs decreases in relation to the centrifugal force created. This causes the springs to press against the inner surface of the drum and actuate it. At the same time, the sprocket wheel that drives the saw chain starts to turn. In different types of chainsaw clutches, it can be located behind or in front of the clutch.

This centrifugal clutch principle has one important advantage. the mechanism automatically slips when the cutting chain jams. Thanks to this, the power unit doesn’t shut down, but continues to work.

The design and operation of the chainsaw clutch mechanism

Most chain saw operators don’t understand how the chainsaw clutch works. During work it is not necessary to know the principle of operation, but when malfunctions occur, in order to eliminate them, it is necessary to find out the design and peculiarities of the chainsaw clutch operation.

Today’s chainsaws are equipped with a centrifugal clutch. Centrifugal clutch. which means that its performance depends on the engine torque. The main purpose of the clutch on a chainsaw is to transfer torque from the engine crankshaft to the saw headset (chain). The device works in automatic mode, and how this happens, let’s find out in detail.

The clutch mechanism consists of the following structural elements:

  • The drum with a removable or fixed sprocket is a transmission mechanism
  • Friction pads. acted upon by centrifugal force, they move and engage with the drum
  • The spring. ensures the pressing of the pads to the crankshaft

Now about the principle of operation of the chainsaw clutch.

When the tool’s two-cycle engine is running, the crankshaft starts turning. A clutch is attached to the shaft, with which the chain is connected by a sprocket. When the chainsaw is idling (shaft speed up to 2,700 rpm), that is, the gas pedal trigger is not pressed, the spring presses the friction pads, which results in no torque being transmitted to the drum.

As soon as the user picks up the chainring and starts to increase the engine speed (maximum up to 14000 rpm), the chain starts to run on the bar. This is due to the fact that the speed of rotation of the crankshaft is increased. Through the force of inertia, the friction plates (also called counterweights) move and engage with the inner walls of the drum. The result is the movement of the drum, which is connected to the sprocket. The rotating sprocket drives the chain.

The principle of operation of the mechanism is simple, due to its uncomplicated design. If this part fails, the chain saw won’t work accordingly. A detailed description of the principle of the chainsaw clutch mechanism is described in this material.

This is interesting!The clutch acts not only as a transmission mechanism, but also as a safety device. It prevents the chainsaw engine from failing prematurely if the chain jams in the wood being sawn.

Chainsaw clutch replacement. Tips and video reviews

Failure of chainsaw clutch is one of the most common chain saw failures.

Over the question of how to remove the clutch on the chainsaw at home correctly and not to harm the tool, think not only inexperienced technicians, and experts who have not once made its repair.

In cases where gasoline cutters start badly, stalling instead of starting check the clutch for malfunctions is mandatory, the recommendations for which will be presented below.

chain saw owners must have repeatedly wondered how to change the clutch on their chain saw? On most models of chain saws the dismantling and replacement of the clutch can be easily done manually by the owner, on a small number of models the unscrewing of the drum can only be done in the workshop (for example, Husqvarna 137 or Partner 351 belong to such chainsaws).

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

The chainsaw clutch drum is one of the most common consumables in a chainsaw, because it is what drives the cutting chain. There are two kinds of drums: one with a welded sprocket and the other with a removable ring gear, and in the second case, only the removable ring gear wears down, the drum itself changes much less often.

When repairing the chainsaw clutch, the rule is that if two chains are completely worn, then the tire is replaced, and if two tires are worn, then the clutch drum is replaced.

You can determine the level of sprocket wear without any special tools, it’s enough just to look at it. the chain moving at high rpm in time rubs the teeth on which it moves. If the wear is strong enough, then the replacement of the chainsaw clutch drum is inevitable.

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This article is about the Husqvarna 137 chain saw. Replacing the clutch drum is an uncomplicated procedure and takes place in several steps.

  • First you must remove the tire and chain brake cover. To do this you can use the combination wrench that comes with the chain saw.
  • Then we remove the air filter cover, unscrew the spark plug, stop the piston of the Husqvarna 137 chain saw. it is recommended that a normal rope be used for this procedure because if a metal stopper is used there is a risk that the piston will be punctured.
  • The clutch disc itself has directions for removal and two holes for a clutch puller.
  • Unscrew the clutch clockwise and remove it. There is a pressure washer under the clutch disc and it must be removed as well.
  • Under the clutch drum itself there is an oil pump with a washer, on which the new drum is mounted.
  • Reassembling the chainsaw is done in reverse order, except for tightening the clutch disc. After the clutch is threaded, the piston must be reseated in order to prevent distortion of the starter group that is on the other side of the crankshaft.

Replacing the chainsaw clutch drum is an essential part of your maintenance routine that will extend the life of all your cutting equipment components. Fitting a new cutting chain to the worn reel would cause the chain to stretch after just a few seconds of use.

In turn, this will lead to a slight increase in the chain pitch, increasing the load on the bearing and sprocket on the bar itself.

Therefore, if you decide to skimp on timely service, then be prepared for the fact that after a short period of time you will need a much more serious investment in the purchase of all consumables of the cutting equipment.

Husqvarna 142 chain link count

When servicing clutches yourself, you need to know that:

  • some saws have a washer between the sprocket and clutch and the sprocket and motor. Keep this in mind when repairing;
  • The special spring of the oil pump actuator must not be damaged during disassembly, and must be returned to its original position. Otherwise the chain will not be lubricated or will cease to lubricate at all.

If the tool has been repaired, it should be checked to make sure it has secure bolt ties, chain lubrication and the motor is running smoothly (it should turn on smoothly and run smoothly). Only after that can it be operated.

Chainsaw clutch repair with your own hands is carried out only in special protective clothing: mask and goggles.

The main malfunctions, their causes and ways of elimination:

  • If the chain mechanism constantly rotates with unstable operation of the power unit. This could be caused by a failed spring. In this case, it is recommended to replace the damaged mechanism with a new one.
  • Noise is heard when the chain is moving. The problem could be caused by overheated cam or a broken spring. Visually inspect the system and replace all parts that are worn out.
  • If the breakdown is due to the fact that the clutch often slips, it is necessary to completely replace the mechanism.

In addition to the basic rules of work described in the previous section, it is worth remembering about some nuances when replacing the clutch. Use only original manufacturer parts. this is the key to long and productive work of the tool. The clutch thread on all chainsaws of any make is always left-handed. Before removing the clutch, carefully remove all dirt and dust from the tool to keep it from getting inside.

How to repair your chainsaw starter with your hands

Partner chain saw starter repair / Broken starter cord

Broken cord

Presented chainsaw starter repair after a broken starter cord. Without a starter cord, a chain saw becomes completely inoperable, there is no other way to start the tool. Repair considered the example of a chainsaw Partner P350S, tricky reliable starting this saw requires a minimum of 4-5 times to pull the starter cord to make the saw work, so I guess the first problem was a broken cord. The cord does not tear immediately, first the protective stocking of the cord threads breaks off and prevents the saw from starting. It is better not to wait for all the threads to break and repair the cord beforehand. There is no need to invent anything, the repair should not cause difficulties, but the exact observance of the conditions of assembly is mandatory. The step by step instruction with the scheme of actions with photos and video is given below.

Remove the three screws that secure the starter cover. The included spark plug wrench with a straight screwdriver is good for this process, but to speed up the work it is better to use a normal tool.

Remove the starter. The chainsaw is equipped with a soft starter, it is located above the spool with the cord.

Unscrew the screw that secures the soft starter mechanism and starter coil. Be careful not to lose the washer!

Starter removed. Unscrew the screw

Soft starter Soft starter reel Reel removed

We prepare a cord of suitable diameter and a length of 1.2-1.3 meters. For the repair we used the kapron clothesline :).

Melt the ends of the rope on the fire, so it does not unravel.

Tie an intricate knot at one end. The node should be large in diameter, but when installed on the coil must not protrude.

Threading the cord into the spool hole. Do not wind the cord!

Reinsert the coil. There may be a mistake during installation. The spool has two slits, one of which should catch the spiral spring. Install the spool so that it fits snugly in its place and the hitch hits the slot. Check it by turning it clockwise to see if a return force is needed.

Knot on cord Cord Cord is secured Spring protrusion

Install the soft starter mechanism. The lug on the starter must fit into the recess in the spool.

Screw on the fixing screw and washer.

Tuck the second end of the cord into the outlet.

Installation of the soft starter The screw is screwed on The cord is pulled out

Tuck the cord into the starter grip. Tie a big knot at the end of the rope. With a small knot there is a chance the rope will slip and the whole cord will get tangled in the starter and to get it out the starter will have to be removed again. Checking the reliability of the assembly. See photo.

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Cord in the trigger knob Locking knot Handle on the cord Twist the coil

Most important moment! Let the cord loop inside the starter and start turning the starter mechanism clockwise without winding the cord! For this saw you need to make at least five turns. Fix the spool by hand. Pull the hinge by the handle outward. Holding the cord and the mechanism allow the cord to wind on the spool. See video.

Put the starter in place and screw it down with the three screws. Repair done.

Repaired starter

Repairing a broken or damaged cord with this step-by-step guide takes 15 minutes, and is much faster and cheaper than calling a service center.

If this instruction helped you, tell us in Комментарии и мнения владельцев.

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How to increase clutch life?

To avoid unplanned repairs, the chainsaw operator should follow certain recommendations. They help extend the life of the chainsaw clutch and protect it from damage to the main operating elements.

  • regular lubrication of the coupling parts;
  • timely cleaning of the mechanism from dust and dried up oil;
  • Use your chain saw only with a good-quality sharp-tipped chain and a completely serviceable guide bar;
  • Avoiding hard metal objects from striking the mounted cutting attachment.

Increased chainsaw clutch wear occurs due to improperly installed brake lever. To avoid further damage, the operator must constantly check the lever, not allowing the chain to rotate when the inertia brake is engaged.

Removing and replacing the clutch with your own hands according to the instructions

Not many sawyers know how to remove the clutch on a chainsaw. The design of the mechanisms on different chainsaw models differs, but the principle is the same everywhere. The disassembly procedure is also almost identical, so next we will look at how to unscrew the clutch on a chainsaw with an internal sprocket.

Initially, you will need to prepare the necessary tools:

  • A special wrench called a wrench puller. It is often supplied with the chainsaw
  • Screwdriver for loosening the screws that fasten the blade guard
  • Spanner. used to unscrew the cowl and tire mounts (comes with the tool)
  • Rope to hold crankshaft in place. Asbestos is best, but any rope will do. A rope is used if the tool does not come with a special piston locking wrench

If the disassembly is performed in order to replace it, then accordingly you will need to prepare a new mechanism in advance. When buying a new coupling, you only need to know the exact brand of chain saw, as the devices differ in external diameter, thread and construction of the working mechanism. Instructions on how to remove the clutch on a chainsaw are as follows:

  • First unscrew the fastening nuts of the cowl and tire
  • Remove the handbrake cover, as well as the chain and tire
  • Then proceed to remove the plastic cover to get to the spark plug. To do this, unscrew the fasteners with a screwdriver, and remove the cover along with the air filter
  • Unscrew the spark plug of the chainsaw using a spark plug wrench
  • In the spark plug hole in the cylinder need to slip a rope (install a special wrench if available). This is done in order to lock the crankshaft. If the diameter of the rope is several times smaller than the size of the spark plug hole, you can make knots on it
  • Next proceed to unscrew the clutch itself. To do this, take a special wrench, which must be included in the set. If you do not have a key, you can use a tool from the angle grinder or make your own puller, which is also not difficult
  • The slits of the wrench must be installed in the holes of the coupling, and then proceed to rotate the part. Rotate in clockwise direction. Usually manufacturers indicate directions for unscrewing in the form of an arrow
  • As the clutch rotates, the piston reaches the top dead center, and then locks the crankshaft. Then, by applying a small amount of force, you will unscrew the clutch and then unscrew the mechanism
  • Unscrewed clutch and remove it from the chainsaw. If necessary, the drum with the sprocket is also removed

The procedure is not difficult at all, and does not take much time. Reassembly is performed in the reverse order of removal. To avoid any malfunctions, it is recommended to install a completely identical clutch to the corresponding tool model.

This is interesting! The procedure for removing and replacing the clutch is the same for all brands of chain saws Husqvarna, Partner and others.

How to adjust the chainsaw clutch?

How to adjust the clutch on a chainsaw? It is more correct to talk about repair, since the carburetor is usually subject to adjustment, 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 tensioning, so if it breaks, the part is considered to be spoiled and replaced with a new one. The absence of a faulty spring will result in a lack of lubricant flow to the chain.

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

Structure and principle of clutch operation

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

  • crankshaft;
  • The disc is of the slave type;
  • pressure plate;
  • Protective cover of the mechanism;
  • release lever;
  • bearing;
  • engagement fork;
  • crankcase;
  • gears;
  • piping;
  • fixing elements.

At minimum revolutions of the power unit, the chainsaw clutch is drawn to the center of the shaft by a spring device and does not transmit torque to the drum. At the time when the engine speed begins to reach the values 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.

In the course of this, the drive type sprocket begins its rotation, which is responsible for moving the saw chain.

Chainsaw clutch repair with your own hands

In detail: repair of chainsaw clutch with your own hands from the real master for the site olenord.com.

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Except of the listed assemblies on chainsaws there is a system of cleaning the air supplied to the carburetor, bar with a saw chain, starter motor, chain tensioning mechanism, ignition, muffler, etc.

Chainsaw engine has the highest rpm at about 13500 rpm. This imposes high requirements with regard to the oil that is added to the fuel mixture.

At low rpm, the elements with the friction plates (1) that have degrees of freedom in a circular direction are attracted to the center of the shaft by the springs (2) and do not transmit the rotation to the drum (3) that is connected to the chain driving sprocket. When the chainsaw engine speed reaches a value at which the centrifugal force exceeds the force of the springs, the friction segments press against the inner surface of the drum and start to rotate it. Eventually, it is the drive sprocket that drives the saw chain that starts to turn.

As you can see in the photo, the sprocket is behind the clutch.

In other chainsaws, the sprocket may be on the outside of the clutch.

The main advantage of this type of clutches is that when the chain jams, the chainsaw clutch slips without stopping the engine and without causing a breakdown of the devices that transmit motion from the motor to the chain.

Electric chainsaw ignition contains a flywheel (1) with built-in magnets, an ignition module (2) with an electrical circuit, a spark plug (3) and a high voltage wire (4). Rotating flywheel with magnets induces in the module e.д.с., which is converted by means of an electrical circuit into electronic signals, which are fed to the spark plug. As a result, a spark flashes between the spark plug contacts and ignites the air-fuel mixture.

Below is a diagram of another chainsaw carburetor.

Carburetors have a throttle valve that allows the mixture to be leaner or richer depending on the operating criteria. For the narrow option is a number of screws, which can be used to adjust the low and high engine speeds, as well as the idling speed. On top of the carburetor is installed air filter, which cleans the air entering it.

In order that as the fuel consistency is used up, the fuel tank is filled with air and no negative pressure is created in it, which will not allow the fuel to flow from it into the carburetor, and at the same time, so that no fuel flows out of the air hole, a breather is made in the cover covering the filler hole. How to Change the Oil Seals on a Chainsaw. How to remove the sprocket, clutch and flywheel on the. And by the way, if the breather is clogged with mud, the chainsaw will stop.

Fuel is pumped from the tank through a hose that’s loose in the tank. that way, regardless of the chain saw‘s position, the hose is always immersed in fuel. How to remove the clutch on a chainsaw | tools in. The fuel filter is attached to the inlet end of the hose. Fuel is pumped by the pump inside the carburetor.

To make starting easier some chainsaws are equipped with a manual priming pump. When starting a chainsaw with primer, the carburetor is filled with fuel ahead of time (excess fuel drains back into the tank). It makes the engine quicker to start.к. the carburetor is already filled with fuel, which is pumped by the starter motor without primer.

The pre-filters can be differently constructed and have several parts, namely a strainer (2) and a snow filter (1) (see the next page). photo below).

The latter prevents snow from getting into the air-cleaning system and is only used in winter, it can be removed when the temperature is above zero.

Some chain saws use centrifugal force air-cleaning during preparatory cleaning. The air is swirled by the flywheel impeller and the dirt is blown away from the suction nozzle going to the fine dust filter.

The narrow filters are made of diffusion foam, nylon mesh and other materials.

When chainsaw works, air in its operating zone can be very dirty with sawdust and wood dust. Excessive filter pollution reduces the volume of air entering the carburetor, which leads to an enriched consistency and a drop in power chainsaw. removing the clutch from a partner p340s chainsaw. How to remove the clutch on a chainsaw. That’s why the filter has to be cleaned all the time. It should be carried out not only when you disassemble the chainsaw in order to repair it, but even more often, after any lengthy and dirty work. the clutch is blown and how to change the chain saw chainwheel easily and effortlessly. cleaning is done in a manner that depends on the type of filter material. in most cases by blowing and flushing.

Flaming hello to all. This video will explain and show you how the centrifugal clutch works on chain saws, trimmers.

Ural chainsaw clutch. adjustment and all aspects.Carefully showing how to set the clutch correctly.

The starter mechanism consists of a drum (1) with a cable (2) and handle (3), and a cage (4) with a return spring. When the handle is pulled sharply upward, the drum ratchet engages with the teeth on the engine shaft and turns the crankshaft. When you release the knob, the return spring returns it to its original position.

It takes a certain amount of force to turn the crankshaft at the speed at which the engine starts. Often it is not possible to start the chainsaw with one pull, you have to pull several times. Various methods are used to facilitate starting. enriching the fuel mixture with a carburetor slide, or reducing the cylinder pressure with a decompression valve (to facilitate crankshaft cranking). burned clutch how to change the sprocket on a chainsaw how to adjust. The valve is made to close automatically when the pressure in the cylinder increases, which occurs during the ignition of the mixture. how to remove a chainsaw clutch. duration: oil on a chainsaw not a chainsaw Partner not. Sometimes the starter mechanism uses an additional spring, which first compresses the cable when pulling, and then sharply unclenched, unwinding the motor.

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