Breakdowns, problems of chain saws
Modern gasoline chainsaw consists of certain mechanisms, the efficiency and productivity of the tool when sawing different types of wood depend on the good condition and coordinated operation of these mechanisms. Each of the nodes of the saw stands out for its service life, after which the tool must be repaired. You can do it yourself, having previously studied common breakdowns and ways to fix them with your own hands.
The carburetor is one of the most important elements of a chainsaw, the main function of which is to enrich fuel with air and instantly feed the ready mixture into the cylinder of the power unit.
The following signs are indicative of carburetor malfunctions:
- Problems with starting the gasoline-powered saw. more effort is required to start the engine than usual;
- unstable operation of the internal combustion engine in different modes. you can notice interruptions when the engine rotates at idle speed, as well as during the transition to low and high revolutions;
- sharp increase in the amount of fuel consumed. on average, the amount of fuel increases by 20-30%;
- Increase in the amount of exhaust gases emitted. the volume of gases increases by 50-60%, and the fumes themselves take on a dark blue, brown or black color.
Adjustment of a chainsaw must be performed on a fully functional and stably working engine. Before you start tuning, you will need to wash or replace the filters, check the integrity of the fuel tubes, and make sure there are no burrs and other damage on the surface of the cylinder and other parts of the power unit of the chainsaw.
In order to be able to adjust the chain gasoline tool on its carburetor device, there are steel spring-loaded screws. Their number and marking depends on the brand-manufacturer of the chainsaw.
The procedure for adjusting the fuel unit for most chainsaws looks almost the same.
The algorithm of action should be as follows:
- First of all, the saw must be shut down and wait for its engine to cool down;
- After that, all available in the device of its carburetor screws should be twisted in the direction of the hand of the clock to the stop;
- Then each of the screws should be turned one-fourth or one-fifth of a turn in the opposite direction;
- Then it is necessary to adjust the operation of the power unit at low revolutions. To do this, the appropriate screw will need to start turning slowly in different directions. As soon as the engine becomes as quiet and stable as possible, the screw should be left;
- To adjust the idle speed on a chainsaw. Pay attention to the chain. If it rotates on the bar, then you need to find the position of the screw, in which it will stand still;
- At the end is left to adjust the operation of the internal combustion engine at high revolutions. To do this, you will need to connect the tachometer to the motor cylinder and start turning the appropriate screw until the indicators on the scale of the device and the instructions in the manual coincide. For example, if the manual says that the maximum rpm of the saw should be 12500 rpm, this is the number that should be indicated on the tachometer scale during adjustment.
To check the chainsaw after adjustment, you need to stop it and wait for the motor to cool down completely. After that you need to start the engine and begin to gently squeeze the gas pedal lever. If the engine revs up smoothly at the same time, then you have calibrated the saw correctly.
The Reasons Why a Chainsaw Saws Crooked?
There are several common factors that impair the balance of the saw’s cutting set and spoil the cutting trimmer line.
- Uneven self-sharpening of the cutting teeth. quite often the chainsaw cuts sideways because of a faulty sequence when sharpening the saw organ. According to the instructions, the teeth should be sharpened at the same distance. If this rule is violated, the teeth that have been ground more than the others will wear out faster. As a result, the chain moves noticeably away from the center, leaving behind a crooked sloppy cutting line for the trimmer;
- operating a chain that does not match the bar. each bar has its own characteristics, including the width of the groove. It is what determines whether the cutter bar can be mounted on the guide rail. If a chain with a 1.3 mm slot is mounted on a bar with a 1.3 mm planting width, a 0.2 mm gap remains. It will cause the cutting attachment to move unevenly across the saw blade, resulting in a chain saw that will cut crookedly;
- Excessive wear on the chain’s cutting teeth. if the chain saw is running sideways. it can indicate excessive wear on the chain. To check the cutter bar, remove it from the bar and inspect the plane of contact with the guide bar. if the cutting teeth are really worn, it is necessary to replace the chain without trying to sharpen it.
The main reason for accelerated chain wear can be irregular lubrication of the saw chain. If it runs intermittently, the chain will lubricate in parts. This causes the teeth that are not supplied with oil to heat up more quickly and wear out.
Your chain saw has a faulty engine
Signs of chainsaw engine failure:
In certain situations it is better to call in a professional and take your saw to an authorized service center. But there are things you can do about it yourself.
In general, to eliminate the very cause, you must first determine it correctly, otherwise the entire repair will be tantamount to shooting sparrows with a cannon, and perhaps even shooting at the “imaginary” sparrows, because there may be no breakage.
If you are trying to start the chainsaw, but it does not start and does not make any strange unusual sounds (knock, rattle), then you just start it wrong (if you keep holding the chainsaw on suction, the engine is flooded with fuel and then it is difficult to start it).
How to start a cold engine? 1. Put the lever or switch in the “choke closed” position. 2. If the model is equipped with a priming pump, pump the fuel mixture into the carburetor. 3. Pull the starter lever until there is resistance, then yank vigorously to the amplitude of moving your hand to the side (2-3 times). No need to try to “rip” the starter cord out of the chainsaw! The chain saw should start, then stop. 4. If the engine fails to start, set the lever to the half throttle or operating position and try starting the chain saw in that position. Note: some models have a pushbutton ignition switch, make sure it is on.
What to do if the engine still does not start? First let’s unscrew and inspect the spark plug. It happens that when they start the chainsaw in the cold, accidentally fill the combustion chamber with fuel mixture. In this case you should also unscrew the spark plug, dry the combustion chamber by idling, clean the spark plug, and try to start the saw again.
How to check the spark plug? Unscrewed spark plug, connected with a high-voltage wire, put it on the cylinder and pull the starter. Be careful! Do not touch the spark plug with your hands during this procedure! If you see a blue spark, the spark plug is good. Re-insert the spark plug and try again. If it fails again. check the high-voltage wire connection from the spark plugs, coil and ignition system.
By the condition of the spark plug, you can understand what happened to the saw:
- Dry Candle. Apparently, the fuel mixture will not get into the cylinder. The problem is not the spark plug, so screw the spark plug back on. And check the fuel system.
- Plug is wet and heavily soiled with fuel. The reason for the excessive fuel level is hidden in either a breach of the model’s winding rules or improper carburetor adjustment.
- The spark plug has a black sludge on it. It may be a sign that you are using bad oil (use only original oil for your saw), that the carburetor is out of tune or that the fuel mixture is mixed incorrectly. Clean the spark plug well with an awl or a needle, wipe off the electrodes with a emery cloth and screw it back in place.
When checking spark plugs pay attention to the gap between the electrodes (it must be 0,5. 0,65 mm). Worn gasket must be replaced.
Checking and Adjusting the Carburetor
In the service centers carburetor adjustment is made on special equipment. The adjustment screw rotation angles are different for each saw (they are listed in the instruction manual). The need to adjust the carburetor does not arise very often, especially if you bought the saw from a reputable dealer. All of our Husqvarna saws are sent to the service center for adjustment of the revolutions before sale.
However, misalignment of the adjusting screws does occasionally occur.
Reasons for malfunctioning carburetor adjustment on your chainsaw:
- Severe wear of the engine (pistons). In this case, more care must be taken to repair the engine, but adjusting the carburetor can improve the functionality of the saw for a period of time.
- The carburetor is clogged because of a damaged air filter, the use of low-quality gasoline, and the formation of scale.In such a situation, in addition to adjusting the carburetor, you will also need to flush it.
- Vibration of the saw or damage to the blade guard. This is very rare, but it does happen.
Signs that indicate that the chainsaw carburetor needs adjustment:
- The engine either does not start or starts and then shuts down. This is caused by using a bad fuel mixture.
- Significant increase in fuel consumption and increased emissions. The engine oil also has a very low temperature during combustion and is not burning as well as it should. This can be caused by a mixture of too much fuel.
The scheme for adjusting the carburetor is different for different chainsaw models and is described in the instruction manual. But the general principle is the same: it is necessary to change the quantity and quality of the fuel mixture, supplied to the engine cylinder.
There are three screws to help us adjust the carburetor:
- “L”. low, to adjust the low rpm
- “H”. high, for high revs
- “T” (“LA”, “S”). for adjustment of idle stroke (models that have only one screw have exactly the screw “T”)
When adjusting the carburetor of a chainsaw, the following rules should be observed:
- Be sure the saw chain is facing away from you
- Place the saw on a stable, level surface and the cutting attachment must not touch any objects.
Note: the exact operating angle of the adjusting screws is described in the manual. Closely following instruction manual to prevent damage to the engine.
The process of adjusting the carburetor itself includes two points: the basic (when the engine is not running) and the final (when the engine is warm).
Checking and Adjusting the Carburetor
Have your carburetor adjusted by your dealer or service center. For each saw the values of the angle of rotation of the adjusting screws are different (they are specified in the instruction manual). The need to adjust the carburetor doesn’t arise very often, especially if you bought the saw from a trusted dealer. All of our Husqvarna saws are sent to a service center before sale, where specialists adjust the rpm adjustment.
However, misalignment of the adjusting screws does occasionally occur.
Causes of improper adjustment of the chainsaw carburetor:
- Severe engine (piston) wear and tear. In that case it is more of an engine overhaul, but a carburettor adjustment can improve the functionality of the saw for a while.
- Clogging in the carburetor due to a damaged air filter, use of poor quality gasoline, and scale formation.In such a situation besides the adjustment of the carburetor you may also need to flush it.
- Severe vibration of the saw or damage to the blade guard. It is very rare, but it does happen.
Signs that indicate the chainsaw carburetor needs adjustment:
- Engine either does not start or starts and then shuts down. This is due to the use of a bad fuel mixture.
- Significant increase in fuel consumption and emissions. Increased exhaust emission indicates that the fuel is not being fully combusted. It may be caused by oversupply of fuel.
The scheme of adjustment of the carburetor in different models of chainsaws differs and is described in the instruction manual. However, the general principle remains the same: it is necessary to change the quantity and quality of the fuel mixture fed into the engine cylinder.
There are three screws to adjust the carburetor:
- “L”. low, for low rpm setting
- “H”. high, to adjust the upper revolutions
- “T” (“LA”, “S”). for adjusting the idle speed (models that have only one screw have exactly the screw “T”)
When adjusting the chainsaw carburetor, the following rules should be followed:
- Make sure the saw chain is facing in the opposite direction from you
- Place the saw on a firm, level surface so that the cutting attachment does not touch any objects.
Please note: the instructions show the exact angles of rotation of the adjusting screws. Precise observance of the instructions will avoid damage to the engine.
The process of adjustment of the carburetor itself includes two points: basic (when the engine is not running) and final (when the engine is warmed up).
Basic carburetor adjustment
Slowly turn the maximum and minimum adjusting screws (H and L) clockwise as far as they will go and then a turn and a half in the opposite direction.
Start by warming up the engine for 5 to 10 minutes (not at high rpm).
Adjusting the idle speed
Now turn the idle speed control knob (T, LA, S) counterclockwise to set the minimum rpm at which the engine is stable. The chain should not move at all. If the engine stops when idling, turn the idle speed screw clockwise accordingly. If the chain moves, turn the screw counterclockwise.
For the final chain saw carburetor tune-up, check the engine for acceleration and maximum rpm.
Checking acceleration
gradually increase the gas pedal and see how quickly the engine revs up from idle to the maximum power. If the engine revs slowly, it may be necessary to loosen the L (low speed) screw by turning it slightly counterclockwise (not more than 1/8 of a turn).
Set the maximum rpm
As mentioned above, the maximum RPM is adjusted with the H screw, the RPM increases when it is turned clockwise, decreases when it is turned counterclockwise.
The highest rpm for gasoline chainsaw engines is 11,500 to 15,000 rpm depending on the model. A higher speed is dangerous for the engine, which will not allow it to start. Maximum RPM can be determined by the ignition intermittency. If it does, turn the H screw counterclockwise.
Check the chain saw again when idling
Once we’ve adjusted the acceleration and maximum RPM, we check the engine’s idle speed again. We will know that we have adjusted the carburetor correctly if:
If at least one of these conditions is not met, adjustment has to be repeated (excluding the basic step).
How a chainsaw is built
The design of a chainsaw is not very complicated. The main elements of its construction:
The carburetor
Most chainsaw models have an identical carburetor.
They have a choke in the housing. It is used to adjust both screws (main and idle), the diffuser, the impulse channel and the inlet connection. The choke also regulates the atmospheric air flow.
Knowing how a carburetor works helps to make proper adjustments. It works like this:
- The engine starts, the air damper opens at the bottom of the body;
- Inside the float chamber and in the air duct, there is a vacuum as the piston moves;
- Air is drawn in through the diffuser;
- Fuel mixture enters the float chamber from the gasoline tank through the nozzle;
- Gasoline mixes with air in the diffuser;
- The fuel-air mixture enters the combustion chamber through the intake ports.
By means of the flap you can adjust the intensity of the air intake into the fuel, by means of the screws you can adjust the engine speed, by means of the nozzle the speed of gasoline intake into the diffuser.
Fuel system
The gasoline filter, carburetor, and manual fuel pump. That said, not all chainsaws have a pump: some models have a hose that feeds gasoline from the tank to the carburetor unit. The end of the hose with a fuel filter is immersed in gasoline, and gasoline stops flowing into the carburetor assembly when the tank is filled with air. To avoid that, a breather valve is attached to the tank lid: when it gets dirty, the engine shuts down.
Manual fuel pump allows you to fill the carburetor compartment with fuel in advance, so the engine starts more quickly.
Air Purifying System
Chainsaws have a system of preliminary and narrow cleaning to keep the gas used to make up the fuel-air consistency, was not bad.
Earlier the air is filtered by a strainer and later by fine filters.
Less air gets into the carburetor because of filter pollution. As a consequence, the engine power goes down. To prevent this, the filters should be blown and flushed at all times.
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Major chainsaw malfunctions: causes
Every year, manufacturers develop equipment that is more complex and reliable by design, but simple to operate. Chain saws are not an exception. But no matter what modern features are included in the device, it is difficult to avoid a chainsaw malfunction. Failure diagnostics can be carried out independently, using the instruction manual. Let’s look at the most common faults that occur.
Saws crooked
Let’s find out why a chain saw cuts crookedly. It manifests itself when cutting under load, when the bar moves to the side little by little. It is especially noticeable when sawing wide trunk by double-cutting, first from above, then from below. The result is an uneven, precisely cut surface, which in some cases is not acceptable. Example. facing bars.
- Unevenly sharpened saw teeth. This is the most common reason why the machine cuts at an angle. Teeth should be ground to the same distance to avoid problems in sawing. Optimal solution is to buy a sharpening machine that is adjusted to the most worn tooth of the saw mechanism. Or go to a workshop that has such equipment. Result. all teeth are the same size.
- The chain or guide bar you are using does not fit the parameters. When buying these items, the width of the groove must be taken into account. it is not only important for the function of the machine, but also for the safety of the cut.
- Severe wear on the saw headset of the saw unit. If the device does not cut well, the headset may be subject to increased wear. A 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 a lot of wear it makes sense to do a complete diagnosis of the lubrication system. This is often the cause of excessive wear on one side of the chain.
In case of complicated repairs, it is better to take the equipment to a specialized repair shop.
Warming
If a new chain saw heats up, it is because the elements of the piston group have not yet run in. In this case, it is necessary to run in, preventing overheating. If the problem is related to a device already in operation, the cause may be late ignition. Sometimes the device overheats due to a disturbance in the proportions of the combustible mixture.
Trouble appears during start-up Fails to rev up
The problem occurs during start-up. The chainsaw does not develop revolutions, works jerking or idling, stalls, starts from a pusher, when starting it bounces back.
- If the device does not hold idle revolutions, the causes may be clogged filter, poor-quality fuel mixture, carburetor, ignition module or deformation of engine elements under load.
- If the saw doesn’t pull at full power, look at the carburetor. It is possible that the settings of the working unit are wrong. Adjust gauge “H”, which is responsible for sawing at load. To do this, set the fuel supply at high RPM.
- Does not decelerate. The problem is that the unit can accelerate quickly at high RPMs and not decelerate. Throttle control, toggle switch operation, corkscrew on throttle shaft must be checked.
- Gains speed uncontrollably. Reasons could be carburetor, fuel supply system, connecting parts leading to carburetor.
- The machine is running on suction only. The cause is improperly mixed fuel or too much oil.
These are the main, most common causes of this type of failure.
Oil leakage
Owners of chainsaws often encounter problems with oil leaking from underneath the machine. The cause is a damaged oil hose that connects to the pump.
No spark
Ignition problems are due to a weak or missing spark on the chainsaw. When checking the spark plug, there may be a blue spark. This indicates that everything is fine. If the spark is gone, check the high-voltage cable. There may be a wire breakage. Another option why there is no spark is due to improper clearance between the ignition module and the flywheel magnet. The norm for this indicator is 0.2 mm.
No gasoline inlet
To find the source of the failure and determine why the unit is not pumping gasoline, disconnect the gas line from the carburetor. Try pumping fuel. If it is slow, there may be a problem:
Specialists do not fill the tank to the brim. This could put the unit out of order.
Smoke
If the machine is smoking, its power is dropping, pay attention to the engine. Unstable starting, overheating, etc. can also indicate a malfunction.
The chain is spinning at idle speed
If your chainsaw chain spins when idling, it may be due to the following factors:
- The clutch spring is broken. Visual signs: The chain will almost always turn, even if the engine fails to start.
- A piece of the clutch has chipped off, the spring has come off. Signs: chain saw springs back, strange noises are heard.
- Worn clutch. Signs: chain sprocket slipping often.
Saw headset operation at idle speed is associated with clutch problems.
How to reassemble
After all the repair work has been done, the quality of the reassembly is important. Improperly assembled parts can cause equipment failure and be unsafe for humans.
- The most critical part is the assembly of the cutting attachments. Wear protective gloves to prevent sprocket cuts. When installing the chain on the bar, pay attention to the direction of the teeth edge. It must go forward, on top of the tire. Place the chain on the drive sprocket. Return clutch cover, tighten nuts.
- Use a tensioning wrench to tension the chain. The quality of this work affects the safe and efficient operation of the machine in the future. A loose chain will come off and a loose chain can wear out quickly. The chain may not be raised over the bar by more than 1 cm. Check the rotation and tighten the nuts.
Any repair work on complex equipment should be performed with care. You should use original spare parts for this. Other alternatives can negatively affect the life of the unit. If you are not sure how to do it yourself, it is better to go to a specialized workshop.
This is especially true for expensive, professional machinery. Improper repairs can cause the entire mechanism to fail. To prevent damage try to follow the requirements of the instruction manual, timely maintenance of the tools, keep an eye on the mechanisms, use quality oil and fuel, replace the wearing parts.
How to avoid premature breakdowns? Tips for chain saw maintenance
Your main reference point should be the instruction manual. If you lost it, you can contact your chain saw company’s dealer and they will give you an instruction manual in electronic format.
So, before each switch on your petrol chain saw, be sure the chain is in good condition, its teeth ground and tensioned (no sag, but also not too tight, it can be pulled away from the blade).
To sharpen the chain you can use a special machine or file with a special template (depending on the tooth pitch of the chain, there are different templates).
Every time after use, the chainsaw must be cleaned: chain, bar, air filter, body, cooling fins, slots and other grooves cleaned of sawdust. After using the saw, turn the bar over so that it wears evenly, lubricate the sprocket (if there are lubrication slots in the front of the saw).
Always drain fuel and oil before storing for any length of time! The chain and bar form an electrochemical pair, so they rust together and must be stored separately.
The chain will not turn
Why doesn’t the chainsaw chain turn when the engine is running even at full speed??
- Drive sprocket. Either it is jammed or the crown is so worn that it is not affected and chaindoes not turn on chainsaw. In either case, you need to reassemble the sprocket to find out the exact reason why the chain won’t turn. If the crown is worn out the sprocket needs to be replaced (or the crown if the sprocket is prefabricated).
- The brake chain is jammed As a result, the sprocket is blocked by the brake mechanism and the motor is running. Stop the engine and release the brake. If it happened under load, the brake mechanism will have to be replaced, as well as the sprocket, because of the high temperature many elements can melt and overheat.
Portal about construction
Most people, when first faced with the use of a chainsaw, wonder how to tension the chain on a chainsaw correctly. Chain installation and adjustment is a very short process.
A properly tensioned chainsaw chain is important for a long life.
To answer this question, we need to understand how a chainsaw works. The device consists of several basic units that ensure its functioning.
Construction Portal
When first starting out in a chainsaw, most people wonder how to tension the chain correctly. Installing the chain and adjusting it does not take much time.
A properly tensioned chainsaw chain will ensure its longevity.
In order to answer this question, you should study the construction of a chainsaw. This machine consists of several major assemblies that keep it running.
The chain is slipping
chain comes off the tire? There can be several reasons, and all of them are different:
- Worn actuator or sprocket. Since the sprocket is worn, the adhesion to the chain decreases, causing the chain to fly away from the chainsaw. Sprocket needs to be replaced.
- The chain is loose. Why the chain stretches on the chainsaw due to insufficient lubrication. the metal heats up and stretches by fractions of a millimeter, but if you consider the number of links, even 3-4 mm is enough to make the chain come off the bar. The chain needs to be changed.
- The chain tensioner that regulates its tension is loose. How to adjust your chainsaw, or more specifically, the chain tensioner? The tensioner needs to be adjusted this can be done in just a few minutes.
The chain saw won’t start
When a chainsaw has trouble starting, many people immediately blame the carburetor. In fact, there are several options and the premise of the malfunction can be no matter what:
- The air and/or fuel filter is clogged. The problem can be solved by cleaning the filters.
- No Fuel in the Tank. Yes, there is a reason. some owners forget about such a minor detail, how to fill gasoline saws and think that a pair of liters of gasoline evaporates and disappears in the tank. There is enough gasoline for half a year. fuel in the tank should not be stored for more than 14 days, i.e.к. gasoline evaporates and loses the octane number.
- Check the hose from the fuel tank to the carburetor. it could be clogged or broken, so gasoline does not flow into the tank.
- No spark on the spark plug. Why no spark. the circumstances may be many: no contact, it is necessary to change the plug or it flooded. Why the spark plug fills up on your chain saw is another question. But if it is out, you need to dry and re-install and then check the spark. If the spark plug has a heavy deposit, it is recommended to change it.
- Check the muffler for carbon deposits. If there is soot. painstakingly clean the muffler, but it is still recommended to take the chainsaw to the service center, so that they checked the cylinder and piston, t.к. Carbon deposits are a sure sign that parts of the cylinder-piston group are not working properly.
- The carburetor is clogged. How to properly adjust the chainsaw so that the carburetor works perfectly was discussed in a separate article.
If none of the above methods did not help, it means that the cause is more serious. the breakdown of 1 of the nodes of the connecting rod and piston group. In that case it is advised to deliver your chainsaw to a service center.
How to tune your chain saw?
The carburetor is one of the most important elements of a chainsaw, the main function of which is to enrich fuel with air and instantly feed the ready mixture into the cylinder of the power unit.
The following signs are indicative of carburetor malfunctions:
- problems with starting the gasoline chainsaw. more effort is required to turn on the motor than usual;
- unstable operation of the ICE in different modes. noticeable interruptions in the rotation of the motor at idle speed, as well as during the transition to low and high revolutions;
- a sharp increase in the amount of fuel consumed. on average, the amount of fuel increases by 20-30%;
- Exhaust gases increase. the amount of exhaust gases increases by 50-60% and fumes turn a dark blue, brown, or black color.
Adjustments should be made on your chainsaw with the engine running in full working order and in a stable condition. Before you start, wash or replace the filter, check the fuel lines for continuity and make sure there are no burrs or other damage on the cylinder surface or other parts of the chainsaw power unit.
In order to be able to independently adjust the chain chain saw, its carburetor device has steel spring-loaded screws. Their number and marking depends on the brand-manufacturer of the chainsaw.
The procedure for adjusting the fuel unit for most chainsaws looks almost the same.
The sequence of actions should be as follows:
- At first you must stop the saw and wait for its engine to cool down;
- After that all screws available in the device of its carburetor should be screwed in the direction of the hand of the clock to the stop;
- Then each of the screws should be turned one-fourth or one-fifth of a turn in the opposite direction;
- Next, it is necessary to adjust the operation of the power unit at low revolutions. To do this, you will need to start turning the appropriate screw slowly in different directions. As soon as the motor is as quiet and stable as possible, the screw should be left;
- To adjust the idle speed on the chainsaw. it is necessary to pay attention to the chain. If it rotates on the bar, then it is necessary to find that position of the screw at which it will stand still;
- At the end it will be necessary to adjust the operation of the engine at high rpm. To do this, you will need to connect a tachometer to the motor cylinder and start rotating the appropriate screw until the indicators on the instrument scale and the instructions in the instruction manual coincide. For example, if the manual says that the maximum rpm of the saw should be 12500 rpm, the same number should be indicated on the tachometer scale during adjustment.
To check the chainsaw’s operation after adjustment, you must stop it and wait for the engine to cool down completely. Start the engine and squeeze the gas pedal lever gently. If at the same time the power unit picks up smoothly, it means that the adjustment of the saw has been done correctly.
If at first signs of power loss (low RPM) with a STIHL MS 180 chain saw, you should under no circumstances attempt to continue working, but rather call in a specialist or have the cause diagnosed and corrected immediately. There are very few reasons for power loss and it is possible to cope with them, even if you are not very experienced.
Chainsaw at the cottage, in a private home. not an uncommon phenomenon. It can be amateur, semi-professional and professional. Choice depends on frequency and difficulty of operation. It greatly simplifies the work of making firewood, helps to quickly put up a log. In most cases it is possible to repair the chainsaw with your own hands. Equipment failure can be associated with idling problems, the mechanism does not start or Troit.
The principle of repair for all chainsaws is about the same. Be sure to read the instructions before working. In this kind of technology is more complicated is not the repair itself, but to find the source of failure.
Characteristics and possible causes of breakage. Fixing the problem with your own hands
Chainsaws are fairly reliable and lightweight designs. Because if you properly care for them and treat them according to the manufacturer’s advice, then they fail very rarely and rather quickly eliminated a variety of failures. But if you are faced with this situation and wish to repair your own tool yourself without resorting to the help of experts, then delve into the information below.
In fact, it is impossible to uniquely and accurately determine the cause of why the tool does not start or stops when you press the gas, because there are many reasons that influence it. But we should not forget the fact that the chainsaw is armed with a conventional two-stroke engine, for its effective performance are important conditions such as: lubrication, fuel, spark and air.