How to assemble the clutch on a chainsaw

Chainsaw clutch replacement

Chainsaws, for a variety of reasons, occasionally need repair. Of course, you can go to a service shop or an experienced mechanic. However, many failures can be eliminated at home with only a minimum set of skills and tools.

Answering the question of how to remove the clutch from a chainsaw, we note that it is not a difficult operation, if exactly adhere to the technology of disassembly. Owners of the tool may encounter certain difficulties if the chainsaw has been in use for a long time, and the clutch parts are stuck to each other. However, even in this case, disassembly can be done with your own hands.

Malfunctions of the clutch

Failure Possible Cause How to fix it
The chain continues to rotate without stopping, regardless of carburetor settings. Motor does not feel stable. The spring in the drum has burst. Remove the spring and replace it with a new one, or put a new assembly.
The chain is turning almost constantly and makes strange noises. Chipped cam.

How to engage the clutch on a chainsaw

The clutch is the link between the engine and the chain saw‘s cutting units. Its main function is to transmit the rotational force created by the motor to the saw headset. Most modern domestic and professional chainsaws are equipped with reliable metal clutch parts, but they also fail completely over time. It is possible to eliminate the failure of the node at home, but for this you must carefully study the order of disassembly and peculiarities of the replacement of clutch elements with your own hands.

Design features and clutch operation scheme

Most high-quality chainsaws from well-known brands are initially equipped with a centrifugal clutch. It is distinguished by its high reliability, long service life and automatic operation, which means it engages automatically as soon as the power unit reaches the desired revolution speed.

The factory-assembled centrifugal mechanism consists of durable friction plates, a chainsaw clutch drum and steel return springs. The friction plates in 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 standard metal drum that is initially connected to the cutter chain sprocket is set in motion. When the speed of the motor is high enough, the force of the built-in springs in relation to the created centrifugal force decreases. This forces the springs to press against the inside surface of the drum and sets it in motion. At the same time, the chain sprocket starts to rotate. Different chainsaw clutches have a cam track behind or in front of the clutch.

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This centrifugal clutch principle has an important advantage. the mechanism automatically slips when the cutting chain jams. Doing so keeps the engine running instead of stopping.

Signs of chainsaw clutch failure

A chainsaw’s centrifugal clutch continues to work until one of its regular elements fails. The following signs will tell you if the mechanism is failing:

Malfunctions in the clutch

Malfunction Possible cause How to fix it
The chain keeps turning without stopping, with any adjustment of the carburettor. Engine becomes unstable. The spring in the drum broke. Remove spring and replace with a new one or install a new unit.
Chain spins almost constantly, making strange noises. Cam chip.

The reasons why you need to disassemble the clutches:

  • Faulty or broken spring;
  • As a result of chainsaw loads and component wear, the spring has left its place;
  • Chips on the plate of the clutch;
  • Parts wear and tear.

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

Chainsaw clutch failures are one of the most common failures of this equipment. 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. This is because the clutch is an important key element in chainsaws of any power class and brand, on which their trouble-free, long-lasting and successful operation depends.

In cases where the petrol cutters start to fail to start, stall instead of starting check the clutch for malfunctions is mandatory, recommendations regarding which will be presented next.

Meaning and device of the clutch

All state-of-the-art chainsaws have a centrifugal clutch. The clutch transfers torque from the tool’s engine crankshaft to the saw unit. The element runs exclusively in automatic mode to prevent overstressing of the engine. The main elements of the clutch:

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Chainsaw Repair. Replacing the Clutch (Poulan Part # 530057907)

  • Drum. Can have a removable or non-removable sprocket, is a transmission mechanism.
  • Friction plates (counterweights). They move under the action of centrifugal force, there is always a smooth connection with the drum part.
  • Springs. They ensure a firm grip on the crankshaft.

Figure 1. Design of the clutch

After the chainsaw starts, the crankshaft is set in motion. The clutch is attached to it, from which the chain drive sprocket is derived. Friction pads are clamped during idle operation so that no torque is transmitted to the drum. Once the revolutions are increased, they move and drive the rotating sprocket.

Important! Professional models have a drum with fixed sprockets. This increases wear resistance but also increases repair costs.

Design of the structure

Most brands of these tools are classic devices with simple, equally working mechanisms. Simple design allows you to easily perform any work even in difficult conditions, and in case of faults quickly and independently to repair, replace parts.

High-octane gasoline is used for the cylinder engines (ICE). Instead of a gearbox, these machines have single-stage gears that drive the chains.

Air filters are also installed to supply purified air to the engine. Reliable, no-failure operation is also ensured by such units:

  • the starter to drive the power unit;
  • the saw headset;
  • chain tensioning mechanism;
  • emergency brake to quickly disengage the tool in emergency situations;
  • the ignition system and the exhaust silencer.

How to assemble the clutch on a chainsaw

Most modern chainsaws come with a centrifugal clutch. The operation of these mechanisms depends directly on the torque generated by the motor.

The centrifugal clutch consists of a spring, a sprocket and a drum. The principle that these elements work together is quite simple. During the start of the gasoline chainsaw engine, parts that move freely in the radial direction, under the action of springs begin to pull against the axis of the factory shaft.

How to Replace the Clutch on a Chainsaw

The rotational force from the motor is not transmitted to the drum, drive sprocket, and guide bar. The centrifugal force pressure gradually builds up and crowds out the force exerted by the springs. At this point, the components of the clutch lose their strength and begin to compress near the inside of the drum. The springs cause the drum to start spinning. As 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 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 saves fuel costs and reduces the risk of a burr in the clutch of the chainsaw motor.

assemble, clutch, chainsaw

Modern chainsaws are equipped with a centrifugal clutch. This means that their work fully depends on the engine torque, which at a particular moment in time gives out the saw.

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Its main structural elements are:

The principle of operation is as follows. When the saw is started, the elements, which move freely in the radial direction, are pressed against the axis of the shaft by springs. In this case, the torque does not go to the drum, and therefore to the sprocket and guide. 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 rotational cycle is transferred to the sprocket and the tire-chain headset 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. The result is that the saw’s “heart”. the engine. stays in one piece.

assemble, clutch, chainsaw

How to remove the clutch on a chainsaw. Clutch design

Chainsaw for the economic man. an indispensable tool that comes to the rescue when carrying out logging operations of varying volume, the implementation of construction projects from the timber, improvement of private estates, gardens, yards, on the farm.

The power unit consists of several important components, including the clutch. Often the tool can fail due to a faulty chainsaw clutch. This is a typical breakdown faced by chainsaw owners, regardless of its class, power, model and manufacturer. To fix the clutch or at least accurately diagnose the cause of the failure, operators need to know how to unscrew the clutch on a chainsaw. This knowledge will allow not only to carry out forced repair work, but also planned cleaning, inspection for preventive purposes. Do not forget that the clutch and its serviceability affect the long and efficient operation of the tool.

How to Re-assemble a Chain Saw Clutch


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