Device and principle of operation

To independently troubleshoot problems, the owner will need a good knowledge of the structure of the chainsaw. This is a mount that is powered by a single cylinder internal combustion engine. Fuel liquid is gasoline. The saw mechanism is driven by a single-stage chain transmission; It is covered with a lid for safety.

The main structural elements are the air purification system, chain mechanism, engine, tensioner, ignition elements, flywheel and clutch. Many small parts connect the main components and contribute to the reliable operation of the device.

The properties of an automatic centrifugal clutch depend on the speed of the power unit. Low rotation speed does not transmit the rotation of the drum. Only when a large number of revolutions are reached does the centrifugal force exceed the force of the springs, causing the drum to rotate. The chain and sprocket located at the front are driven.

Tire faults and repair methods

To repair a chainsaw with your own hands, you will need a detailed diagram and an understanding of the basic mechanisms of the device. The guide rail and its fastenings are the vulnerable parts that are subject to the greatest load. You can repair chainsaw tires yourself or by contacting a service center. Wear and breakage in this section are indicated by the lack of normal tension, sudden or intermittent movement of the chain, and the inability to provide normal lubrication and fastening of the saw axis relative to the body of the unit. Types of breakdowns:

1. The rear and front drive links are riveted. The reason is a mismatch between the sprocket angle and the chains, weak tension or sprocket wear. The problem is solved by replacing or adjusting the mechanisms.
2. The presence of broken or incomplete links indicates low voltage or an open circuit.
3. Rounded spout backs occur when the headset is too long and there is no oil.

READ Oil Consumption for Shtil Chainsaw

How to sharpen

Periodic sharpening is a mandatory measure necessary for the normal operation of a gas appliance. Self-sharpening methods:

1. Using a file is a simple and common option that allows the event to be carried out directly at the cutting site.
2. Using a special machine. The method is found in personal households and service centers.
3. Using a sander. Sharpening will require skill.

A special machine is the most effective method. But with a file you can also achieve good results.

How to choose a tire

The choice of bus is a critical event on which the entire device depends. Installing the wrong element not only causes failure of other components, but also poses a hazard to the operator. Information about the length, size, shape and shank parameters will be necessary to select the correct component.

The size is determined by the type of work you plan to do with the saw. Small sizes are suitable for simple manipulations and cutting thin boards. The most powerful units are useful for harvesting firewood from thick tree trunks.

How to install a bar on a chainsaw

Before removing the tire, it is recommended to check that you have the necessary accessories and tools. Tire installation starts with the quick chain tensioner, then switches to the side and front devices. Following the sequence will allow you to correctly assemble the mechanism and ensure productive operation of the tool.

Source

A chainsaw is a very useful thing in the household. Indeed, it quickly and relatively easily solves many housing, landscaping and landscaping problems. Chainsaws are a rather finicky tool, but when used correctly they are an indispensable tool. Which has one drawback: the guide. It accounts for the majority of workloads. This means that knowing why tires are more likely to fail than other chainsaw parts, and how to properly replace them when necessary, will help you save money and time during seasonal or project work on the tool.

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

The clutch repair process consists of the following operations:

• Remove the chain assembly, air filter cover and the clutch itself;
• Stop the crankshaft. Just unscrew the ignition section;
• Unscrew the coupling using a special key with a strong movement clockwise or counterclockwise (different saw models may have both left-hand and right-hand threads). Typically, a clutch removal tool is included with the chainsaw;
• Start disabling the drum and sprocket;
• If, upon inspection of the coupling, one or more spring cracks are found (there may be several of them, for example, Husqvarna chainsaws. 3 pcs.). The new spring must be replaced with a new one;
• Place the clutch on the chainsaw, set it in place and screw it down. Remember that the crankshaft must remain stationary;
• Assemble the removed parts onto the saw in the reverse order of disassembly;
• Lock the clutch. Slide the auxiliary brake lever, start the unit, and carefully remove it from the coasting brake.

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Chainsaw

Fastening saw

Operating a saw with a faulty guide bar is unsafe. So at the first sign of trouble, you need to turn off the engine and find out what's going on. Knowledge of the design features of the tire and its attachment to the chainsaw will help to successfully eliminate the cause of the malfunction.

The bar determines the axis and length of the cut by controlling the chain. But the basis of the mechanism is still established. It is installed in the groove between the inner plate on the motor housing and the outer plate located on the chain set housing. The tire and body are secured with bolts. This part of the mount is called the “motor assembly”, and its shape and design depend on the chainsaw model. The mounting bracket and drive are covered by a separate cover.

READ DIY ATV Made from a Chainsaw

Chainsaw tires

The drive links of the saw chain are mounted in a guide groove on the edge of the bar and are connected to a drive sprocket connected to the power take-off shaft. If the locking bolts are loose, the tire may move. The chain tension can be adjusted manually or, as on professional chainsaws, automatically. Finally, the stop is located in front of the mounting rail. It serves to securely fix the cutting axis when the moving chain is in contact with the wood.

Chainsaw sprocket design: with replaceable and fixed head

The working bar must ensure normal chain tension. To check this, release the chain brake and pull the chain by hand in the direction it is moving. If the chain does not move, the fastener is too tight. You need to release it for a bit and then check the free games chain again.

Adjust the chain tension using a wrench

Weaknesses of the saw

Saw a tape device

Currently, there are various types of saws on sale, which differ:

• Body length and width;
• Registration amount;
• The presence of a high-strength nozzle at the front;
• The presence and type of driven sprocket hidden in front of the tire body.

Different types of saw bars

The shape of the shank and the location of the technological holes in the tires are standard for most amateur and professional chainsaws, but they can be structurally divided into open and closed. Obviously, the former are inferior to the reliability of fastening to the body of the latter, that is, increased loads are applied to the tires and bolted connections. You also need to ensure the integrity of the sprocket teeth - if dull or chipped, this will render the drive chain links unusable.

Parameters and options for chainsaws and their elements in the photo

The chainsaw tire requires regular maintenance. After each operation, its grooves must be cleaned of dirt and sawdust, otherwise the oil will not get into the chain. Tires should wear evenly, so they should be turned over from time to time. In addition, before starting work, always check for oil on the chain body and in the gap.

READ Carburetor Adjustment for Shtil 211 Chainsaw

Check the lubrication system

More than three chain sets with one bus are not recommended. During operation, the gap, despite all the strength of the metal of the bar body, increases, which leads to play during movement of the chain and its sagging, even when the bar is in the forward position.

The drive sprocket located in front of the tire is lubricated separately. Oil does not get in there, unlike the rest of the guide groove. It is poured into special holes in the front of the tire, and if there is no sprocket, it is placed on the toe of the tire.

Separate nose gear lubrication system

When do you need to remove the coupling?

Disassembling the coupling for removal is carried out in the following cases:

• When the spring breaks (the chain rotates, the engine runs intermittently);
• Spring has come;
• A piece of the drum has broken (in this case you will hear a noise and also twist the chainsaw chain);
• Temporary wear (time to remove and replace the coupling at the end of its life).

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Modern chainsaws operate on two-stroke engines, which are connected by a gearbox to a saw chain. The chain moves along the tire, and according to the principle of centrifugal idling, it must remain stationary, i.e. 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 bar. This will stop the engine. In such situations, the clutch wears out and must be replaced over time. In the operating instructions for chainsaws, some manufacturers have information that the clutch is a consumable item, that is, it must be periodically replaced.

Video. how to remove the clutch on a chainsaw:

Replacing the chainsaw bar and its fasteners

Scheme for fastening tires with a chainsaw

Replacing chainsaw mounts and tires is necessary when:

1. Critical wear of the landing groove or shank elements.
2. Damage to the body.
3. Broken fastening bolts.
4. Damage or deformation of the tire body.
5. Damage or breakage of drive teeth and driven sprockets.
6. Damage to the grooves on the chain.
7. The chain tensioner is worn.
8. Deterioration of the tire groove and clamp.

That's why you only need one Allen wrench, which comes with the tool, to change the saw blade and hardware - both consumables. And, of course, knowledge of the algorithm for disassembling, assembling and adjusting the mechanism.

Chainsaw

To disassemble the tire mount:

• Place the engine vertically and, after unscrewing the corresponding nuts, remove the drive sprocket cover;
• Lift the bar with the front end and turn the chain clamp screw to release it from the bar groove;
• Pull the chain from below and, by turning the clamping screw, pull it out of the groove;
• Remove the chain from the drive sprocket and pull it out from under the cover, then set it aside;
• If there is damage or signs of wear, the housing and gaskets should be replaced;
• Remove the chain bar that needs to be repaired or replaced from its socket.

Remove and replace the coupling yourself according to the instructions

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

First you need to prepare the necessary tools:

• The special key is called a stripper. This often comes with a chainsaw.
• Screwdriver for unscrewing the screws securing the protective cover
• Wrench. used to unscrew the cap and secure the tire (supplied with the tool)
• Rope. choke the crankshaft. It is better to use asbestos, but any will do. A rope is used if the tool does not have a special piston locking key.

If disassembly is performed for replacement, then you need to prepare a new mechanism in advance. When purchasing a new coupling, you only need to know the exact brand of chainsaw, since the devices differ in outer diameter, thread and design of the working mechanism. The instructions for removing the clutch on a chainsaw are as follows:

1. First you need to unscrew the nuts securing the casing and tires
2. Remove the cover from the handbrake, chain and bar.
3. Then proceed to remove the plastic cover to get to the spark plug. To do this, unscrew the screwdriver and remove the cover along with the air filter.
4. The chainsaw spark plug is unscrewed with a spark plug key
5. Insert the cable into the spark plug hole in the cylinder (install a special key, if available). This is done in order to dampen the crankshaft. If the diameter of the rope is several times smaller than the size of the hole for the candle, knots can be made on it
6. Next, move on to the clutch screwdriver. To do this, take a special key that must be turned on. If you don't have a wrench, you can use a tool from an angle grinder or make your own puller, which is also not difficult
7. The key veneers must be installed in the coupling holes and then continue to rotate the part. You need to rotate clockwise. Manufacturers usually indicate unscrewing instructions in the form of an arrow.
8. As the clutch rotates, the piston reaches top dead center and the crankshaft locks. Then, applying a little force, the clutch will come off with further unscrewing of the mechanism
9. The twisted coupling is removed from the chainsaw. If necessary, the drum with the sprocket is also removed.

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The procedure is not complicated and does not take much time. Assembly is carried out in the reverse order of removal. To avoid any malfunctions, it is recommended to install exactly the same clutch on the corresponding tool model.