Why does the spring on a Husqvarna chain saw bend?
The key role in any chainsaw is played by a carburetor power unit of two-stroke type. Its power depends directly on the chosen model and purpose. The second important mechanical component in the device is considered the saw part, which consists of a bar, a cutting chain and a chain wheel. The parameters of these components may vary.
The lubricating mixtures are processed by means of a special oil, which is poured into a specialized tank located on the hand block. Separately, it should be emphasized that the volume of the oil tank and fuel tank are calculated in such a way that their contents, as a rule, ends at the same time.
Troubleshooting and troubleshooting options
Whether you have a Champion, Husqvarna 236, or Patriot chainsaw, the causes of poor performance are identical. There are plenty of variations in why a STIHL chain saw does not start, but the most widespread are.
The chainsaw does not start well when cold
If the cold chain saw does not start well, it could be a sign of insufficient compression. This is caused by the wear and tear of the rings as a result of prolonged use. It turns out that when the user tries to start Champion 137 in the cold, there will not be enough compression to perform this manipulation.
In such a case, do not systematically pull the handle. In the end, the unit will still start, but it may break other mechanical components. In this case you need to replace the worn rings with new ones.
The chainsaw will not start when hot
Here the causes lie in the filling of the engine and wetting the plugs. Here’s what to do in such a situation:
- move the air damper to the middle position;
- Blow out the component parts well;
- start the machine for 10 seconds;
- put it in idle mode;
- On a Kalibr or other model of chainsaw, open the choke completely.
Then just idle the engine by pulling the knob. If the engine is not overheated it will start easily.
If this variant of troubleshooting did not help, it means that the engine has already had time to cool down a lot. Check the half throttle and restart according to the instructions and repeat the operation.
You should also try turning the idle speed screw in a clockwise direction. The higher the speed of rotation in the equipment, the easier it is to start. Be aware that the chain should remain in a stationary position when idling.
The chainsaw does not start well and immediately stops
In this situation, the cause is that the spark plugs were filled with gasoline when the user tried to start the machine. A small amount of fuel accumulates under the spark plug electrodes, due to which there is no spark in the equipment.
To solve the problem will help to remove the plug and dry it thoroughly. In addition to these measures, kneading can also be performed. But this manipulation should be done only with a gas burner. Otherwise there may be a small amount of soot in the area of the electrodes. After the spark plugs are completely dry, you need to drain the excess fuel and leave the equipment itself to dry.
Chinese saw doesn‘t start
Immediately it should be noted that the Chinese devices do not have distinctive features from other analogues. They are just as reliable and productive, and cost less. The only thing that is necessary individually for this device is to use only branded oil and fuel.
Most machines don’t work well on domestic fuel, gasoline clogs the channels and as a result the fuel won’t reach the engine. Use either high quality fuel or from the manufacturer of the saw itself.
Why the new saw doesn‘t work
New equipment should not have problems with wear and tear of functioning mechanical parts, since the model has only come out of the conveyor. Such untidiness can occur when buying demonstration equipment that was not once used to promote the company. It can also be caused by improper use of the machine, which does not comply with the recommendations in the manual.
The first thing to do is to check that all parts and components are in place. Also, for example, a Husqvarna will not start if it has been filled with a fuel mixture that does not take into account the correct proportions.
But if all the recommendations have been followed, each part has been properly fixed in its place, and the equipment has not been purchased from a test bench, it is likely that the buyer has got a defective device.
The fuel in the tank is not enough or of poor quality
This is one of the most common causes. Users of gasoline-powered machines, in order to save money, often use budget fuel. At the beginning the machine will perform its work properly, but the problem will definitely arise after a few months of operation.
Chainsaw stalled and won’t start
If the tool stalls and does not start you should first check the presence of fuel in the tank. Strange as it may sound, but many people forget about it, and if a similar situation arises, immediately try to repair the tool, which can lead to serious damage.
If you have gotten stuck and there is still gas in the tank, it is a good idea to look at how the saw was working before that moment. Sometimes it can happen that at the last moment an unusual noise occurs, rattle, noise, loss of power or the tool suddenly stops. All this allows you to preliminarily assess the situation.
The engine is jammed
It is quite common to see a situation where the saw was running and suddenly stopped, caused by the engine jamming, which in turn is the result of piston skirt rupture, crankshaft bearing failure, piston pin corkscrew out or piston ring breakage.
A stuck engine is easily detected by pulling the starter cord. If the starter does not turn, it is most likely jammed and you can have it repaired only in a service center.
Fuel line breakage
When the chainsaw is running there is vibration, which can be the cause of damage or breakage of the chainsaw fuel line. If this is the case, the chainsaw will stall and cannot be started. To diagnose the problem, you need to inspect the chain saw and look for fuel leaks.
Overheating
Engine overheating during operation, can cause the saw to stall and not start. Overheating is dangerous enough, because it can melt the piston in the cylinder and cause the engine to jam. At the first cases of overheating, it is worth carrying out diagnostics of the tool on the presence of foreign air suction in the engine, and adjustment of the carburetor.
Air suction and improper carburetor adjustment affect maximum engine speed and lubrication, which in turn causes tool overheating and seizure.
Classic set-up
Classic Husqvarna layout makes it easy to fix the chain saw yourself. The chain guide bar is on the right and side of the saw and the emergency brake is located there. Engine housing from left to right encompasses the auxiliary grip. On/off button is rear-mounted and thumb-operated, and a clip-on gas pedal button on the handle.
Drum and starter handle are on left side, above the cooling grill. Fuel filler cap below left.
All parts of the machine are hidden under the housing cover.
Husqvarna 142 layout
Husqvarna saw disassembly algorithm
Dismantling a Husqvarna chain saw is easy. In order to do everything right and not to break any housing or CPG parts, you must disassemble in the following order:
- Top cover.
- Chain brake and saw headset cover.
- Starter.
- Flywheel and clutch.
- Front handle.
- The carburetor.
- Oil pump.
- Engine.
Depending on the Husqvarna model, the disassembly procedure may be slightly different.
Important: Before you start to disassemble the chain saw, you need to clean it. When you work with the saw, you get a lot of chips and wood dust, which can get into the inner workings of your Husqvarna chain saw when you disassemble it.
Removing the side cover and the chainsaw headset
The side cover, also called the saw chain brake cover, is held in place by two thirteen-nut nuts.
After unscrewing the nuts, the cover is removed from the guide rods and the guide bar and chain can be removed from the chainsaw. Some models of Husqvarna saws have a special mechanism that allows you to remove the cover and the saw headset without using special tools.
Starter
The starter is located on the right side of the Husqvarna, and is held in place by several screws. By unscrewing them, you can easily remove the starter and thus gain access to the flywheel and ignition coil.
Handwheel and Clutch Removal
To undo the flywheel nut, unscrew the spark plug and replace it with a piston locknut.
If you have no special stopper, you can use an old chain saw starter cord instead. You need to tie knots on the cord at a distance of 2-3 cm, and then, using a screwdriver, insert it through the spark plug hole inside the cylinder. The string will limit the piston stroke and prevent the crankshaft from turning, thus preventing damage to the piston.
Once the piston stopper is installed in the cylinder, you can unscrew the flywheel nut. Once the nut has been loosened, use a hammer and a mallet of soft material to make one sharp blow, placing the mallet on the flywheel mounting shaft. This is necessary to remove the flywheel from the shaft, t. к. The design provides for the installation and tightening of this element with a great effort.
To learn more about how to remove the flywheel from a Husqvarna chain saw, and how to completely disassemble the saw, watch this video. The master explains the entire process step by step and demonstrates all the necessary tools:
In order to unscrew the clutch, a special wrench is needed. If it is not available, it can be made from an old twenty-two head and ground to a specific shape using emery cloth.
The clutch has a left-hand thread and unscrews clockwise.
Don’t try to unscrew the clutch with a hammer and chisel, as some craftsmen advise. using these tools you risk breaking the clutch housing and increase the cost of repairs. It can also damage the bearings of the crankshaft.
Front handle
Removing the front handle of the Husqvarna is simple enough, t. к. it is attached to the shock absorbers with screws.
Air filter and carburetor
To remove the carburetor it is necessary to disconnect the fuel hose and slide rods from it, it is convenient to do it after removing the air filter, which is installed immediately behind the carburetor and is held with two nuts for 10. After the air filter is removed and the fuel hose and linkages are disconnected, simply pull the carburetor toward you and remove it from the studs.
Use tweezers and medical clamps to remove carburetor.
Oil pump
The oil pump on Husqvarna is installed on the right side of the chain saw. It can be removed only after unscrewing the clutch. No special tools are needed for this removal.к. The screws are made for a common Phillips screwdriver. After the screws have been unscrewed, it is necessary to lift the pump and disconnect the oil hoses from it.
Engine
To remove the engine on a Husqvarna chain saw, after removing the carburetor, clutch, flywheel, and muffler, you will need to remove the four screws that secure it to the housing.
After the engine is removed, you can unscrew the ignition coil from it, remembering to disconnect the wires that go from it to the ignition switch. Coil can also be removed as soon as the starter motor is removed.
To assemble a chain saw Husqvarna it is necessary to follow the reverse order, in which case it is necessary to tighten the flywheel nut and the clutch with a force, the value of which is indicated in the instruction manual of a chain saw.
Possible chainsaw malfunctions
As a rule, the breakdown of the chainsaw is associated with the failure of the engine or its parts, due to violations of the rules of operation and storage of the tool. Other problems are also possible, such as chain lubrication system malfunction, chain brake malfunction. Thus, the main chain saw malfunctions, which are encountered in practice by our service center craftsmen, are the following:
- Trouble in the ignition system
- Fuel system malfunctions
- Carburetor failure
- Exhaust system malfunctions
- Worn or damaged parts in the cylinder-piston group
- Chain lubrication system breakdowns
- Malfunctions in the chain brake
Breakdowns and how to fix them
There are two categories of faults in the lubrication system:
- Common breakdowns found in all types of power units;
- Individual, which depend on the type of pump, on the features of the worm-type transmission, on the design and other features of a particular chainsaw.
Important! If the lubrication system does not work, the saw should not be used. So you’ll ruin not only the chain, but also the guide bar and the main sprocket, which leads to the need for a large investment in repairing the unit.
“Symptoms” of a faulty lubrication system:
- The chainsaw is dry, pale, no shine;
- The chain is quickly stretched after installation;
- the guide bar becomes hot and the paint melts;
- the oil level in the reservoir remains the same in spite of intensive use of the tool;
- chain cutting efficiency is greatly reduced.
All of these points to a faulty or malfunctioning lubrication system.
If consumables are flowing, the cause of the problematic operation of the lubricating assembly is most likely a clogged filter, which can be cleaned or replaced with a new one. If possible, adjust the flow rate after this procedure.
If the consumable does not flow, then additional diagnostics should be performed, because the problem seems to be more serious.
Note that it is not always necessary to remove the tire to check the operation of the lubrication system. Alternatively the end of the bar is directed sideways (use a block) from the direction of the cut, maximizing the speed, keep the bar (its end) in 10 centimeters from the block. When oil is applied, you will see corresponding spots.
How to tune the chainsaw
In the process of repairing the Husqvarna chainsaw with their own hands identify some of the failures that occurred as a result of improper adjustment of the ignition and carburetor settings.
The mechanism is responsible for the motor speed and is set up for operation according to the desired conditions:
The Husqvarna chain saw’s carburetor is factory-set at the time of testing for productive operation.
The unit has 3 adjustable areas:
To adjust the chainsaw, after the running-in adjust the carburetor: first, deal with the jug “L”, then the idle speed screws “T” and “X”. Turning “L” and “X” clockwise makes the air-fuel mixture worse, turning it counterclockwise makes it richer. Turning the “T” screw clockwise increases the RPM of the idle.
See ” Pros and Cons of the Popular Partner 350 Domestic Chainsaw
Repair of the carburetor is performed by a specialist.
Alternative fuel option
For domestic and professional chainsaws it is recommended to use gasoline without alcoholic components and additional additives. automobile gasoline type AI-92.
The question whether it is safe to put 95 gasoline in a chainsaw remains controversial. Theoretically, the anti-detonation properties of gasoline AI-95 is higher than that of standard fuel AI-92, but in practice it is better to give preference to the second option.
The problem is that to improve the anti-detonation properties in the composition of the 95 th gasoline manufacturers and sellers entered additives, the quality and effectiveness of which raise reasonable doubts among experts.
Such fuel does not fully meet the required characteristics, does not have the proper stability during long-term storage. After 3 to 4 months, its performance deteriorates by 25-30%.
Why is the chain on a chainsaw jammed??
Reasons for chainsaw chain not turning. damage to the drive sprocket and burning of the tip of the saw guide. The first thing to do is to inspect the clutch. If you see uneven wear on the drive sprocket, cracks or other problems, it needs to be replaced.
If even after that the chain still jams and breaks, then the bar needs to be checked. Burning of the tip like any other part of the guide causes the chain to become too hot and to shift. When the guide bar is rotating, the offset header becomes jammed. This is evidenced by cases in which the chain is stretched on the chainsaw exactly in those places where the operator previously discovered the burning and melting of the guide.
The most common cause of a burned-out bar is a fault in the cutting attachment’s lubrication system. If this happens you need to inspect the oil pump and flush it clean of debris or hardened lubricant.
How to make a chainsaw run quietly?
Before you find the answers to this question, you need to figure out why the gasoline tool has become louder.
Signs and causes of this problem include:
- sharp shooting noises or a steady increase in volume as the regular engine revs up. a carburetor problem;
- The occasional knocking sound is a contact of nearby parts;
- howling sound from the drive side. excessive wear on the drive sprocket;
- loud whistling noises. problems with the overrunning brake.
If none of these malfunctions are present and the operator just wants to reduce the noise of the running engine, it can be done by replacing the original muffler.
For this purpose, assemblies from professional chainsaws are best suited. They are designed to silence the loudest sounds, so they will effectively deal with normalizing the engine volume of less powerful chain saws.
Read why chain saw chain oil fails to flow
Situations where the chain breaks are common because the cutting blade is exposed to high loads. The lubrication system built into the STIHL 260 or Champion 142 chain saw minimizes the damage caused by heat and friction and thus prolongs the service life of the cutting attachment and guide bar. An oil pump in the tool conveys oil from the oil tank to the saw headset with shanks that reach the chain sprocket and extract the oil and distribute it over the entire length of the blade.
Good lubrication combined with uninterrupted operation of the system ensures optimum lubricant supply and effective cooling of the cutting attachment. Otherwise the clothing quickly becomes blunt, overheats, is stretched or bursts.
Among the symptoms indicating insufficient flow of oil into the tire’s groove should be noted:
- Heavy wear on cutting edges of saw chain links.
- Appearance of a specific smell of burning wood.
- The chain will not turn.
- Increasing the load on the motor.
The presence of debris in the oil ducts is a common reason why the chainsaw chain does not turn oil, especially for Chinese machinery with limited access to problematic areas. Oil starvation in brand-name equipment, such as the STIHL 180 or Goodluck 4500, which can cause the chain not to turn, is due to the following factors:
- Mechanical damage to the pump worm drive components.
- Oil filter clogging.
- The chainsaw is filled with thick consistency oil in low temperatures.
It is not difficult to verify the efficiency of the lubrication system. To do this, run the cutting blade and make sure that there are small particles of lubricant on the surface of the material to be machined. If, however, when the engine is not running, oil is dripping heavily from the saw unit, you should consider cleaning the bar groove, the chain link channels or optimizing the functionality of the oil pump. In order to improve the process of cutting blade operation it is recommended to use modern oils and lubricants in wholesale as well as in retail, which can be purchased in the online store “Benzo-Zip”.
All causes of chain breaks on a chainsaw
The main reason that the chain loosens and stretches is the use of unreliable oil, as well as replacement of the lubricant recommended by a chainsaw manufacturer with an substitute. By the way, refueling with summer oil when using the tool in the winter often leads to the fact that the lubrication does not go, which is likely to malfunction the oil pump drive and a significant decrease in its performance.
Why tears chain on a chainsaw? Such a problem can be explained by the negative influence of the following factors:
- The chain is too tight.
- Tailstock mismatch or guide bar problems.
- Blade overheating because the bar is not lubricated.
- Wrong chain type and therefore often sparks.
If the user of a chainsaw has faced a situation where the chain saw loses its integrity, cuts badly or the oil pump does not lubricate the blade, we recommend seeking help from the experts of Benzo-Zip profile store. We have real professionals, who are well-versed in the design features of brand tools, as well as analogues of Chinese and Ukrainian production.
Our consultants are ready to give you comprehensive information on the possible causes of faults on the saw head and offer you effective methods of restoring your chainsaw’s functionality at home. In addition, the catalog store exhibited lubricants and tires for chain saws in demand in Ukraine models, the price of which pleases pleasantly democratic.
Maximum rpm
To limit it, use a screw marked H. Turn it clockwise to increase the RPM and backwards to reduce it. Maximum rpm should not exceed 15000 rpm.
If you turn it more than this, the engine of the machine will run out of fuel and cause ignition problems. When turning this screw it is necessary to take into account the ignition processes of the appliance. If there are the slightest failures, the maximum RPM value should be reduced.
No lubrication on the STIHL chain saw
We recommend you check it out
- STIHL chain saw: oil flow to chain
- Design and repair of the chainsaw oil pump
- How to thin chain saw oil?
- STIHL chain saw oil
- Oil for chain saws Husqvarna
- Hooper Farmer chainsaws
Problems with the oil supply to the chainsaw chain. What’s the difference?
The main reasons why the oil doesn‘t come out.
The STIHL chain lubrication system consists of
The chain requires a constant supply of lubricant during operation. It has to be pumped continuously
This is required by the design of the device. When the chain saw is in operation, the oil leaves the bar groove and is immediately absorbed by the sawdust.
Chain lubrication is therefore automatic. Some chainsaws are equipped with a system that regulates the exact amount of lubricant to be supplied. The cheapest units are equipped with a hand pump, which is powered by an actuator located on the handle.
Checking the chain lubrication system.
READ How to start a STIHL 180 chain saw in the cold
Gear lubrication is absolutely not suitable for operation. It freezes in winter and the oil system becomes blocked, so you have to clean it out completely.
In winter, chain lubrication is very demanding. It gets thick and resembles vaseline in extreme cold. For winter operation it is therefore necessary to lubricate chain saws with a special winter oil which is a thinner consistency.
It is not always possible to buy such lubricant. To remedy the problem, diesel fuel is mixed with oil and the viscosity is lowered. But if the oil you’ve previously used is left in the crankcase, adding the diluted oil will not have a positive effect, and the system ducts will remain clogged. There is only one way out. to warm up the chainsaw in a warm room.
If there is not much solidification of the chain oil, you can try to melt it by running the saw at low idle speed.
Lubrication system malfunctions and how to correct them
The main faults of the oil supply system on a chainsaw can be divided into two main types, these are common faults inherent in all chainsaws, and individual faults that may vary depending on the type of pump and worm gear installed on a particular model. Let’s start to understand the faults in order.
It is forbidden to work with a chainsaw if the chain is not lubricated. This is detrimental to the bar, drive sprocket and chain and can lead to severe repair costs.
Signs of a faulty lubrication system, check if it is working
- The chain saw chain is dry and has a pale shade without shine.
- The chain stretches relatively quickly.
- The bar is very hot and some of the paint may even melt.
- Oil in the tank hardly escapes.
- Cutting performance on the sharp chain has decreased
All of these symptoms are an indication that the lubrication process is not working properly. In order to check the oil flow in the lubrication system it is necessary to remove the chain saw side rail and start it. Next, you need to increase the rpm a little, watching the place where the oil line ends. If oil is coming in, it is probably not enough for proper lubrication and the filter should be cleaned or replaced and if possible the flow should be regulated. In the case when it does not come, the problem is more serious and requires further diagnosis.
There is a way to check oil flow without taking the tire off. to do this you have to point the end of the guide bar in the direction of e.g. a freshly cut billet on the cut side and increase the rotation speed as much as possible, keeping the end of the guide bar not more than 10 cm away from the billet. If oil stains begin to appear on its surface. then the oil is fed.
Troubleshooting
After it was determined that the oil is not pumped, further diagnostics is possible only if you remove the oil system completely. Of course in some situations changing the filter helps, but that is very rare.
Access to the oil pump of some models of saws is possible only after a complete disassembly, respectively, not having skills in the repair of power tools, the repair is better to trust professionals.
Most common problems
- Oil hose breakage. Can sometimes be detected on visual inspection. The problem is solved by the replacement of the defective part.
- Lack of thread on the oil pump shaft, replacing it will help.
- A damaged thread on the pump driver pinion can often be fixed by fitting a new piece.
- Lack of corkscrew on the main shaft (true for some brands like Homelite). It can be corrected by replacing the original corkscrew with a suitable diameter nail and cutting it to the required length.
- Clogged line. Can be removed by blowing out with compressed air or mechanically with a wire of suitable diameter.
- Clogged filter element.
- STIHL MS 180 with a pump that cannot be disassembled often becomes clogged. You can try to wash it in the clean gasoline, if it does not help replace it.
- In Chinese chain saws (Gypsy), very often the grooves on the main gear are cut, through which the force from the sprocket is transmitted to it.
Individual faults in the lubrication system of the STIHL MS 180
Since the STIHL MS 180 is one of the most popular chain saw models, we would like to dwell on a particular characteristic malfunction and explain how to fix it without changing parts.
The STIHL MS 180 chain saw frequently experiences a leakage in the oil line where the oil pipe from the tank is inserted in the housing of the saw. The defect can be determined by distinctive grease leakage on the bottom of the tool.
To fix the problem you need to remove the handle, take the hose out of its seat hole, clean and degrease it. After all these manipulations it is necessary to put a sealant on the hose seating and install it in the chainsaw frame.
For more information on troubleshooting and a complete diagnosis of the STIHL chainsaw lubrication system, watch this video which shows how to disassemble and repair the lubrication system step by step.
Adjusting the carburetor of a Partner 350 chainsaw with your hands
Before you start tuning your Partner carburetor, first clean it thoroughly of dust, dirt, and sludge build-up. In addition to the carburetor you will need to wash and dry the fuel and air filters. Otherwise the operator will not be able to set the engine RPM accurately.
On the upper left side of the protective plastic housing of your Partner there are holes in which the manufacturer provides screws for adjusting the carburetor. Having found them, you can proceed to the basic adjustment of the assembly. To do this, the left and right screws, which are responsible for the number and quality of revolutions, respectively, should be set to the fully screwed position. Immediately after that, they must be loosened by 1/5 of a turn. Left the third adjustment bolt marked “T” in the correct position.
To fine tune the carburetor on your Partner 350, follow this procedure:
- First, you need to start the saw and let its motor work for a complete warm-up;
- After about 5 minutes you can adjust the carburetor. Turn the left adjusting screw first in the direction of the hand of the clock until the engine has reached the maximum speed. Then turn the left adjusting screw 1.4 turns in the opposite direction. After performing these actions, the engine of the Partner chainsaw should confidently run at idle speed;
- If after manipulating the left adjusting screw, the chain on the bar began to rotate, then it must be stopped by alternately turning the bolt T;
- Then you should proceed to adjusting the quality of the fuel mixture. Turn the right adjusting screw in the direction of the arrow on the clock. As soon as the engine reaches the maximum allowable revolutions, the screw should be turned back by 1/4 turn.
When setting the maximum engine speed of the Partner 350 saw, it is better to use a tachometer connected to the engine in advance. As soon as the device will show the same revolutions, which the original instruction manual of the model says, it means that the turning of the screw should be stopped.