How to shorten the chain from a STIHL chainsaw
What are the causes of chain saw malfunctions?
Every year, manufacturers develop equipment that is more complex and reliable in design, but easy to operate. Chain saws are no exception. But no matter what advanced features are included in the unit, avoiding a chainsaw malfunction is difficult. Failure diagnostics can be performed independently, using the instruction manual. Here are the most common faults that can occur.
Let’s look at the reasons why a chain saw cuts crookedly. This manifests itself during sawing under the load of barrels, when the bar moves to the side little by little. Particularly noticeable when sawing a wide barrel by double-cutting, first from the top, then from the bottom. The result is an uneven sawed surface, which in some cases is unacceptable. Example. facing bars.
- Uneven sharpening of saw teeth. This is the most common reason why the machine cuts obliquely. Teeth should be ground to the same distance to avoid problems in sawing. Optimal solution is to buy a sharpening machine that can be adjusted to the most worn tooth of the saw mechanism. Or call a workshop, where there is such equipment. Result. all teeth are the same size.
- The chain or guide bar you are using does not fit the parameters. When purchasing these components, the width of the groove must be taken into account. This is not only important for proper operation of the machine but also for safety when sawing.
- The saw head of the product is badly worn. If the saw does not cut well, there could be excessive wear on the headset. Visual inspection will indicate the problem. If the right or left side of the guide bar is more worn, it must be replaced with a new one. If there is excessive wear, it makes sense to have the lubrication system checked completely. This is often the cause of excessive wear on one side of the chain.
For complicated repairs, it is best to have the machine repaired in a specialized repair shop.
If a new chain saw heats up, it is because the piston assembly has not yet fettled. In this case, it is necessary to run it in without overheating. If the problem is related to a device already in operation, the cause may be a late ignition. Sometimes the unit overheats due to improper proportions of the fuel mixture.
It is not picking up speed
The problem occurs at startup. The chain saw is not revving, it is running rough or idle, it is stalling, it is jump starting, or it recoils when you start it.
- If the machine fails to idle, it may be because of a clogged filter, bad fuel mixture, carburetor, ignition module or deformation of the engine components under load.
- If full power is not available, check carburetor. The settings of the power tool may be faulty. Adjust the “H” choke, which controls the cut when loaded. To do this, set the fuel supply to high rpm.
- It does not decelerate. The problem is that the unit may speed up quickly at high rpm and not decelerate. You need to check the functioning of the throttle, toggle switch, the presence of a corkscrew on the shaft of the throttle.
- Uncontrollably picks up rotational speed. Causes may be in the carburetor, fuel supply system, connectors leading to the carburetor.
- The machine is running on suction only. The reason. improper preparation of the fuel mixture, a large amount of oil.
These are the main, most common causes of this type of failure.
Owners of chainsaws often face a problem when oil leaks from below, from under the unit. The cause lies in a damaged oil hose that connects to the pump.
Ignition problems are caused by weak or missing spark on the chainsaw. When checking the spark plug, there may be a blue spark. This tells you that everything is fine. If no spark, check high voltage cable. There may be a broken wire. Another option, why there is no spark, is associated with improper clearance between the ignition module and the flywheel magnet. The normal value for this parameter is 0.2 mm.
No gasoline coming in
To find the source of the breakdown and determine why the unit does not pump gasoline, disconnect the gas line from the carburetor. Try pumping fuel. If it is supplied slowly, the problems may be:
Specialists do not fill the fuel tank to the brim. This could kill the apparatus.
If the equipment is smoking, it has a drop in power, pay attention to the engine. Unstable starting, overheating, etc. can also indicate a broken clutch.
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The chain spins at idle
If the chainsaw chain spins at idle, it may be due to the following factors:
- The clutch spring is broken. Visual signs: the chain is turning most of the time, even if the engine fails to start.
- A piece of clutch chipped off, a spring came off. Signs: the chainsaw itself picks up speed, extraneous sounds are heard.
- Clutch Wear. Signs: frequent slipping of the chainring.
Saw headset operation at idle speed is associated with clutch problems.
If there is a need to shorten
Often when working in the woods or on a remote job site you will not be able to find a replacement for a worn chain.
Having taken all the advice into account, and making sure to shorten the chain exactly, it’s important to know the sequence and possible ways of replacement.
They are not many and depend on how many links need to be removed and under what conditions the repair will be made.
Each link (the cutter and the links that connect them), has two of these rivets. If the nearby “native” connecting links are damaged, you can use elements from any other similar chain of any, even automobile, equipment. You just need to adjust the profile with a file, especially at the bottom, where it has a small groove.
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The easiest way is to take a long chain, in which you can easily remove several segments. So, at least there is a possibility of using the original links. They are removed with a hacksaw for metal, but it’s better to use an emery.
Initially it is necessary to grind off unnecessary rivets, and then cut off a surplus section. To do this, you need to pick up a knife and knock out with a homemade pry bar rivets of the unnecessary links.
Joining a new chain, you have to make a homemade riveting of the links. The rivets themselves can be bought in a store, but if you do not have them, use steel wire, or better yet, a short bolt with a flat head. Riveting is done on a rigid base (metal workbench or vise). Putting one by one through the elements of the future rivets, use a hammer to flatten them on the back side.
You can read about the types and characteristics of modern chainsaws here.
How to tension chain on chainsaw correctly?
This is another issue for users of any power class gasoline-powered saw. In this aspect, not only the tensioning procedure itself is important, but also its correct diagnosis. To do this, take hold of the top of the tooth and pull it upward. With normal tensioning, the third part of the tooth tail should be in the groove of the guide itself. In cases where a larger value is a direct signal of an overtightened chain, and if a smaller value is a slack chain.
In addition, the chain must be able to move freely on the guide bar itself.
A deviation from the norm indicates the need to tighten or loosen, t.е. adjust chain. If there is slack, the tensioner, which can be in the form of an ordinary nut holding the tire guide. With the use of the adjusting screw, the rail is fed forward, taking a particular tension. The sawing element must be turned by hand at all times to achieve the required smoothness of its movement. At the end of the adjusting act, simply tighten the clamps and you can start using the machine.
Actions performed can be considered correct if there is inertia in the chain rotation, running smoothly and clearly.
The chain tensioning on a chainsaw is often found without any tools, which is a privilege of the high-tech modifications of the current chainsaws, where the change of the chain or guide bar does not require any additional tools and is made in minutes.
How to choose a bar
The choice of the busbar is a responsible action on the result of which the operation of the whole device depends. Installing the wrong element not only leads to failure of other parts, but is also unsafe for the operator. In order to intelligently select the component, you will need data on the length, size, shape and parameters of the shank.
The size is determined by the kind of work you plan to do with the saw. Small dimensions are suitable for simple handling, cutting thin boards. The most powerful units will be useful for cutting firewood from thick tree trunks.
Chainsaws & Tools : How to Shorten the Chain on a Chainsaw
How to install the bar on a chainsaw
Before removing the tire, it is recommended to check the availability of the necessary accessories and tools. Installing the bar begins with a quick chain tensioning system, then you need to go to the side and front device. Following the sequence will allow you to assemble the mechanism correctly and ensure productive operation of the tool.
Almost every owner of a country house has a chainsaw. And we don’t even have to talk about people in rural areas: such a tool is a vital necessity for them. And a chainsaw requires careful attitude and timely maintenance. All maintenance rules are clearly spelled out in the manual.
Why the electric chainsaw will not start
What to do if the device does not show any signs of life at all? If saw does not turn on, could be:. Low voltage in mains. Measure with a voltmeter. If below 180, connect the equipment through a voltage regulator. Sometimes it is recommended to buy a good alternator with AVR and power all power tools from it when the power grid is down The power cord is damaged. Check the cord and all connections. Replace or solder breakage and insulate Start button does not work. Disassemble. Repair or replace. Sometimes in case of a faulty button the power supply is switched on directly, but it is not a good option for an electric saw. it critically reduces the safety. The chain brake has tripped. Check it. It turns on when the brake element shield is in a certain position. The panel should be moved back a little Thermal protection relay has tripped. If you plug in an overheated appliance. Need it to cool down, and maybe the relay needs to be repaired The carbon brushes are worn out. A common problem. Happens even with almost new tools. Loss of power is common at first.Replace the graphite contacts with new ones Damage to the motor windings. Overheating destroys the windings. Must be rewound. It’s quite a complicated process. You need to disassemble the motor, remove the burned-out winding, and clean the grooves from the insulation. And then make everything yourself in reverse order. And to wind the coil, use a winding machine. In general, if you are an electrician, go ahead. If not, take it to a service.
How to lubricate chainsaw chain?
Every wood sawing tool has a headset lubrication system. It is the one responsible for supplying oil to the gears that regulate its rotation.
This mechanism consists of the following elements:
- oil reservoir. most chain saws are located in the engine crankcase;
- The hose is made of rubber, which is resistant to oil;
- A filter placed near the oil reservoir;
- oil pump;
- The gear that transmits the chainsaw engine power to the oil pump.
In order for the chainsaw chain lubrication to work smoothly, you need to know what to lubricate the needle bearing of a chainsaw. The best oils for this are those with a high density and penetrating effect. STIHL and Husqvarna specialty oils are the ideal oils, you can use a regular syringe to fill them up. If you use low-quality compounds for regular lubrication, you may soon need to replace the drive roller and needle bearing.
Use of special equipment
Experienced craftsmen recommend using specialized equipment to shorten. This allows you to do a quality job, avoiding damage during the subsequent operation of the tool.
Figure 1. Chainsaw rivet punches This is a mechanical attachment similar to a conventional press. Includes anvil, slots for fixing the saw set with different tooth pitch. For convenience, there are interchangeable tips for squeezing the rivets. The tool is intended only for disconnecting the links.
The riveting-rolling machine
Figure 2. Riveting-rolling machine Used together with a riveting punch for riveting and rolling the saw chain at different pitch. The cutting depth of the headsets can vary from 1.1 to 2 mm. Includes rotating inserts, anvils marked A or B (difference in pitch).
Working mechanism. the saw chain with a new link and fresh rivets are fastened in the guides. The section is then pressed against the built-in anvil by a roller, the motor is started. As it rotates, it presses and crushes the rivet. Slowly tighten the adjusting screw during the process. The advantage of the riveting machine. in quality and strength rivets do not differ from the factory ones, they can withstand a heavy load.
Important! It is inexpedient to buy machines for a home workshop. They are expensive and designed to work only with the chainsaw headset.