Restoration or replacement?
Drive parts are manufactured from extra strong high alloy alloys in an industrial environment. In addition, they are subjected to special treatments to improve their strength properties, wear resistance and corrosion resistance. These may include:
- Shot-blasted surface sealing.
- Protective coating.
It is impossible to repeat such a technological process in a home workshop. An attempt to restore by surfacing with subsequent milling to size will also not work. Such a restored gear will work several times less than the factory one. The cost of a repair kit is incomparably small compared to the wasted effort and time.
Replacing a part in service workshops is not cheap, so the most reasonable and economical is to replace it yourself with a suitable industrial gear.
Chainsaw Sprocket Replacement
How to remove a bar from a saw
Design features of leading sprockets
The pitch of the teeth of the drive gear is one of the main parameters of the assembly. It should match the pitch of the chain links and, just as important, the pitch of the teeth of the driven sprocket located at the end of the chainsaw bar.
According to their design features, the drive gears are divided into:
Experts identify the following signs of wear on the drive gear teeth:
- semicircular depressions are visible at the base of the tooth;
- the thickness of the tooth changes with height;
- chipped areas at the top;
- scratches appeared inside the hub hole;
- the chain has rubbed the groove on the sprocket;
- when starting the chainsaw wedges.
A chainsaw sprocket with such signs should not be used, it must be removed and replaced.
According to the manufacturer’s recommendations, the tool should be inspected before starting work. In this case, the condition of the saw bar is necessarily checked, whether it is securely fixed. If the screw regulating the position of the chain roller and its tension is loosened, or the nuts securing the bar to the body are loosened, it deviates from the plane of the chain. In this case, the blade rollers do not rest on the middle, but on the edges of the teeth, increasing the load on them and on the chainsaw as a whole. Increased wear leads to premature failure.
Sprockets with replaceable and stationary crown
After tightening the fasteners and adjustments, a test run is made. If free play remains, then the sprocket will have to be removed and replaced.
Chainsaw tire repair
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Chainsaw sprocket, crown and bearing
The vast majority of household saws are sold under the Partner brand. In them, it is enough to simply change the asterisk even at home by purchasing a repair kit.
Since most often the sprocket in household saws is an assembly mechanism, it rotates due to the bearing. Replacing the asterisk with Stihl ms 180. forum. repairs. That is, by changing the sprocket, you inevitably change the bearing not to the shaft.
In professional models (such as Stihl and Husqvarna), as well as in household ones, if it is not possible to have a specialized key for removing the star at hand, use a soft cord with a diameter of 5-6 mm.
In all cases, the sequence of actions is as follows:
- You need to open the side cover to gain access to the tire and sprocket.
- Next, you need to remove the tire by loosening the chain.
The main malfunctions of chainsaws and actions to eliminate them are described here.
How to replace with your own hands
Experienced craftsmen recommend the following sequence of operations when replacing a sprocket:
- Remove housing and air filter (if necessary).
- Unscrew the spark plug and insert the retainer instead to lock the piston.
- Remove the chainsaw clutch.
- Remove the gear with a puller or open-end wrench.
The removable ring should be unscrewed clockwise. If during disassembly it turns out that the parts of the centrifugal mechanism are worn out or broken, it should also be removed and replaced. If the parts and assemblies are not visually damaged, then the assembly of the mechanism is carried out in the reverse order.
How to remove an asterisk from a chainsaw with your own hands
To correctly and accurately fix the clutch mechanism on the drive shaft, remove the piston retainer, gently pull on the starting cord and release it.
How to choose a tire
The choice of a bus is a responsible event, the result of which depends on the operation of the entire device. Installing an unsuitable element not only leads to the failure of other parts, but is also unsafe for the operator. In order to correctly select a component, you will need data on the length, size, shape and parameters of the shank.
The size is determined by the types of work that you plan to do with the saw. Small dimensions are suitable for simple manipulations, cutting thin boards. The most powerful installations are useful for harvesting firewood from thick tree trunks.
Why is it heated
In some cases, during operation, you may notice that the tire is overheating, there are two reasons for this phenomenon. The first is a factory defect. In such parts, low-quality bearings are installed, which heat it up during operation. The defective part will warm up and nothing can be done about it, only a replacement but a new one.
The second reason is, again, not enough lubrication, or its complete absence. If such signs of overheating appear, such as the paint melting at the tip of the tire and its strong smoke, it is worth stopping the operation of the tool and contacting the service center.
The choice of a tire for a chainsaw largely depends on the characteristics of the chainsaw itself. It is worth choosing only the components recommended by the manufacturer, taking into account the pitch of the drive sprocket, the width of the groove for the chain and the shape and size of the shank. The guarantee of a long service life of the saw headset of the chainsaw is an uninterrupted supply of a sufficient amount of lubricant of the appropriate brand. Excessive bar and chain wear and heat are signs that the chain lubrication system is not working properly. We have highlighted the main points of the choice, remember them and take them into account when buying, and then you will definitely buy what you really need.
Chainsaw manufacturers, for each specific model, recommend using a saw bar of a certain size and technical parameters. For the right choice, it is worth considering these parameters and then there will be no problems.
Chainsaw chain wear signs
Normal wear and tear on the cutting links of the chain is not the only reason to change the chain.
- Damage to the circuit elements, they say that such a headset can no longer be used. They are detected by visual inspection.
- Deformation of rivets and connecting links, the appearance of cracks occurs due to the strong tension of the chain and leads to its weakening and the need to replace.
These signs indicate that the saw head is worn out and it is time to replace it. In this case, it is strictly forbidden to work with a faulty circuit. Since it can suddenly break off and severely injure.
How to sharpen a saw chain?
In the event that you are going to sharpen the chain indoors, then clamp the bar in a vice (this will not damage the tire). If you do not have a vise, you can purchase a clamp.
If the number of links on the chain is not divisible by 4, then it is better to start sharpening the chain with two links in a row, otherwise you will have to count the sharpened teeth).
Choose a tooth that is bent away from you. The holder must be installed at right angles to the bar. Risk 30 ° should be parallel to the tire. Make two or three movements from yourself with a file. In this way, sharpen through one cutting tooth, then turn the saw over and sharpen the second part. For even wear of the file, do not forget to rotate it periodically and clean it from chips. The holder indicates the chain pitch and the diameter of the suitable file. Do not forget to ensure that the notch of the file does not run into the fasteners, otherwise it will simply grind them.
Reasons that lead away from a straight cut
Sometimes there are situations when it is almost impossible to make a straight cut with a chainsaw, the tire goes to the left or right. The reason for this behavior of the tool may be the following:
- Incorrect chain sharpening. The teeth of the chain are sharpened more on one side than on the other. You can fix the problem by sharpening the chain correctly.
- Uneven wear of the chain links, the support pads of the chain links on one side have a large output, because of which the chain tilts slightly and it is no longer possible to obtain a straight cut. The problem can be solved only by replacing the chain.
- Last but not least, uneven wear. As in the previous case, for this reason, the chain will change the slope and it will no longer cut exactly. The problem can be solved only by replacing the tire.
The inability to make a straight cut with a tool is a sign of increased tire and chain wear, which in turn is worth looking for its cause. Eliminating the effects of wear by replacing consumables will not bring the desired result, because in case of not eliminated malfunctions of the lubrication system, after a while everything will be repeated.
Guide bar weaknesses
The main parts of the tire are the body and the groove. The width of the latter is called the gap. The front of the guide bars is made of heavy-duty steel. The tire body is also hardened.
Saw bar device
Currently, there are various types of saw bars on the market, which differ in:
- body length and width;
- the size of the gap;
- the presence of a nozzle of increased strength on the front part;
- the presence and type of driven sprocket hidden in the front of the tire body.
Various types of saw bars
A Woman’s Guide To Changing A Tire
The shape of the shank and the location of the technological holes in the tires are standard for most amateur and professional chainsaws, but structurally they can be divided into open and closed. Obviously, the former are inferior to the reliability of attachment to the body of the latter, i.e. the busbar cover and bolt connection are subject to increased loads. You also need to monitor the integrity of the sprocket teeth. when blunt or chipped, it will quickly render the leading chain links unusable.
How often to change a tire on a chainsaw
You have become the happy owner of such a wonderful tool as a chainsaw, and now you can saw anything at all. But the moment comes when you begin to notice that the instrument is somehow not working well. Cutting requires more effort and time, and its quality is questionable. This is the first sign that your chainsaw chain needs attention.
How to change a car/truck tyre in 5 minutes using a garden spade and tyre levers
over, if you have never sharpened the chain, then this is the very moment when the time has come to master this wisdom. To do this, you need to acquire a special tool. On average, a new chain undergoes 3-4 such procedures, after which it must be accurately changed.
To properly sharpen the saw head requires some skill. At the same time, there is an opinion that the profitability of these efforts is very insignificant. Since the resource of the sharpened chain is small, and the process itself is laborious and takes time.