The stihl ms 180 chainsaws are designed to make their use as easy as possible for inexperienced users. For this, some of the settings available on the more powerful Stihl models have been abolished in the saw carburetor. But there is still an opportunity to adjust, and repairs, as well as adjusting the carburetor of the chainsaw calm 180 with your own hands, is possible.
First, it is worth deciding why it may even be necessary to adjust and repair the stihl ms 180 carburetor at all. So, this must be done in the following cases:
This list can be continued for a long time, but we have identified the main reasons. Before proceeding with the adjustment, you need to know what the main parts are. carburetor on the chainsaw calm 180, and who produces it.
So, the stihl ms 180 carburetor is developed and manufactured by a subsidiary of Stihl, called Zama. Original carburetors have a company logo on their body, which guarantees the quality of products.
A fuel pump is installed directly in the carburetor body, which operates under the action of an air pulse from the crankcase of the chainsaw, which is transmitted through special channels. A diaphragm is installed in the pump, it is she who is responsible for pumping fuel under the action of an impulse. A gasket is installed between the diaphragm and the body, which is responsible for the tightness of the fuel pump.
In the distribution chamber, as in the fuel pump, there is also a membrane that opens and regulates the fuel supply by pressing a special rocker arm, which raises its needle valve.
The cover of the chamber is the compensator body, which is attached to the carburetor with four screws; a gasket is installed between the body and the cover, which increases the height of the chamber and is responsible for sealing.
The fuel injector is mounted in the carburetor body in such a way that it is a connecting link between the distribution chamber and the cavity in which the throttle valve is installed. Simultaneously with the fuel, air is supplied to the nozzle and an air mixture is formed. The injector has a check valve that blocks the flow of air in the reverse sequence, that is, from the throttle chamber to the distribution chamber.
The throttle valve is installed in the carburetor body and is responsible for increasing the supply of the fuel mixture directly to the engine cylinder. At the moment of pressing the gas, the throttle valve opens slightly, thereby increasing the throughput of the channel and the fuel from the carburetor cavity, rushes into the cylinder in a larger volume.
Combustion of a larger volume of fuel increases the amount of generated energy, which affects the power and speed of the processes. The damper is installed on the shaft passing through the entire carburetor body. At the exit of the shaft from the body, a mount for the gas cable is installed, next to it is a cone-shaped adjusting screw responsible for adjusting the idle speed.By tightening the screw, you can slightly adjust the position of the shaft and the damper installed on it, thereby increasing or decreasing the idle speed, slightly opening or vice versa closing the damper.
VIDEO the main Stihl 180 chainsaw carburetor malfunction .
The carburetor choke is installed on the opposite side of the throttle and is responsible for starting a cold engine, it is controlled by the engine control lever. For a cold start, the air damper is completely closed; for normal operation, it is opened.
The Stihl 180 chainsaw carburetor, indiscriminately, can only be adjusted by the number of idle revolutions. It is impossible to increase or decrease the fuel supply in different modes using special screws. The manufacturer restricts access to adjustments and does not install these screws. How to adjust the carburetor to the correct idle speed is described in great detail in the manufacturer's instructions.
In the event of certain malfunctions, and experience, increase or decrease fuel supply it is possible by increasing the clearance when opening the needle valve.
To increase the flow, the rocker needle valve in the distribution chamber, it is necessary to bend up, and to decrease, down. This regulates the stroke of the needle and, accordingly, the throughput of the valve.
You should not carry out the adjustment yourself, since this must be done very accurately and in case of an error it is almost impossible to return the original position of the rocker arm.
After we have examined the carburetor device, it will not be difficult to determine the reason why fuel enters the combustion chamber in a larger volume. This is due to the wear of the gasket between the compensator cover and the carburetor body. How can this affect you, you ask?
The answer is simple, by contracting, the gasket releases the diaphragm on top of it a fraction of a millimeter down. She, in turn, will press harder on the rocker needle valve , it will open more than it should be and the fuel will be supplied in excess (it will start to overflow).
Another reason is the stretching of the diaphragm itself, this occurs as a result of natural wear and tear. It is impossible to prevent this process, but you can solve the problem by periodically changing all the gaskets, carburetor diaphragms, and the fuel pump. There is a repair kit for this.
When cleaning the chainsaw with compressed air, never blow into the fuel pipe, as this can stretch the diaphragm.
A common reason for the failure of the carburetor on a chainsaw calm is the sticking of the valve in the nozzle. The reason for sticking is a violation of the storage of the chainsaw, or rather the manufacturer's instructions Calm 180 on the correct preparation for storage.
As follows from the instructions, before long-term storage, it is necessary to drain the fuel from the tank, then start the saw and burn the gasoline from the carburetor. Failure to comply with this elementary rule entails the following consequences. The forsknui valve, being in direct contact with the fuel, sticks to the body, since the gasoline evaporates little by little and only sticky oil remains. It is impossible to replace the nozzle, since they are not in the repair kit, you can only try to knock it out and rinse it, which is not always possible to do without damaging the nozzle.
In cases where it is necessary to clean the Stihl 180 carburetor or disassemble it, first you need to remove the unit from the chainsaw. This must be done in compliance with a certain algorithm of actions:
Put the protective cover for the chainsaw on the tire.
Remove the top cover of the chainsaw.
Remove the two nuts securing the air filter and carburetor.
Remove the air filter housing.
Disconnect the wire from the engine control lever.
Carefully remove the lever from its seat in the housing, while simultaneously disconnecting the choke rod from it.
Pull the carburetor towards you and disconnect fuel supply as well as throttle thrust.
To facilitate dismantling, you can additionally untwist the rear handle and disconnect the throttle rod first from it, and then only from the carburetor. This may be required, because without some experience, disconnecting the rod from the carburetor is quite problematic and it is easier to disassemble the handle first.
To install the part in place, follow the reverse order of the algorithm.
When removing and installing the chainsaw engine control lever, you should be extremely careful, since the seat on the saw body is the weak link of the saw, and very often inexperienced users break it.
In order to purge, change gaskets or the needle valve, the carburetor must be disassembled. To do this, unscrew 4 screws on the expansion joint cover and one on the fuel pump.
Having opened the case, you should be extremely careful, because if debris gets into the inside of the carburetor, it will make its work impossible. The thickness of the channels in it is comparable to the thickness of a thread or even a human hair.
A video for repairing a calm 180 carburetor can be viewed below. In it, the master tells in detail about the problems and clearly demonstrates the entire repair process.
In conclusion, I would like to note once again that the Stihl carburetors, which are manufactured by its subsidiary Zama, are very reliable. With proper operation and storage, they are able to serve the entire period allotted to the chainsaw without repair.
All of the above applies to any models of chainsaws, including petrol trimmers, scythes and other equipment. Adjusted, of course, for design features.
There is an opinion that it is better not to climb inside the chainsaw on your own. For those who are used to working with a hammer and sledgehammer, perhaps this is so. Otherwise, any neat person who does not shake his hands can fix any problem with his work. In general, this is a job available to anyone.
Of course, it happens that the problem cannot be solved on its own. And you need to contact the service center. But firstly, 90% of faults are usually solved by simply flushing the nozzles or, in the worst case, replacing the membranes or adjusting the needle, and secondly, in the worst case, even if you are desperate, the carburetor removed from the saw can be easily replaced. The new original is, of course, a little expensive. The price for an analogue made in China is 700-800 rubles, you can buy it in a well-known store or from Russian dealers. In general, there is nothing to lose - we climb into the carburetor!
Let's make a reservation right away - diagnostics is an insidious thing. Sometimes the same symptom occurs due to completely different reasons. But we will check everything and find it together. So:
The idle jet may be clogged. Cleaning is required. How to do it - more on that below. But for now, let's talk about alternative reasons.
It is possible that the problem is in the fuel system. Check fuel hoses, fuel supply.
Sometimes problems with rpm (or rather their absence) are solved by cleaning the fuel tank check valve (gasoline tries to leave the tank, but air does not return instead). It looks like the one shown below in the picture:
Do not forget to readjust the carburetor in the only possible way - to change the amount of air supplied, which affects the idle speed very strongly. Everything is described in the instructions for the saw. For those who are too lazy to go into the instructions, here's a screenshot:
A special case of the previous problem. The solution required is the same.
Two very subjective indicators. In order to reliably state this or that, instrumental measurements are needed. From the practice of repair organizations, quite subjective things are often given out under one or the other. In some cases, blunt circuit effects can be mistaken for power loss.Naturally, performance in this case will be low. The saw sometimes seems to be quieter (blockages in cooling system, exhaust system). Increased fuel consumption can be caused by fuel leaks.
Often the problem is the muffler, not the carburetor!
Problems with the carburetor (how to fix and diagnose - below);
Overheating - cooling problems. Clean your saw;
Lack of air supply;
The chainsaw starts to stall or changes speed when tilted to the side. In the vertical - everything is fine, when turning - the revolutions fall (or grow) and it stalls
It is associated with the design features of its fuel system, filling the chambers. In addition, it is imperative to check the gas pump - sometimes the problem may be in it.
First of all, you need to understand that the carburetor of any engine is a unit into which the flows of air and gasoline converge. Therefore, for its normal operation, these streams must come in a working order, not clogged. In addition, the combustion products in the engine must freely leave the chamber through the muffler. Therefore, every time, before repairing and adjusting the carburetor, we must check:
Intake air filter;
We remove and clean the muffler;
We check the absence of problems with the fuel system - supply hoses, serviceability of the gas tank (operation of the low pressure compensation breather, see above);
In principle, it is not even so vital to turn the idle speed. Serviceable elements will already give normal performance characteristics.
The removal process is best shown in the video attached below. It also demonstrates the basic minimum steps in order to bring the node into working order. Schematically, this process looks like this: remove the cover, rods, unscrew the unit.
A significant part of the problems with the unit are associated with hardened or faulty carburetor membranes. The easiest way is to replace them if it has not been done for a long time. In workshop stores or on Aliexpress, whole repair kits are sold (their cost is about 200 rubles), containing all the necessary membranes. Sometimes, for an amount of about 600 rubles, you can buy yourself spare parts for the entire life of the chainsaw (see fig.).
Moreover, in this particular case, the kit also includes a rocker arm with a needle, which are also subject to wear and in some cases require replacement. In short, for the price of a new unit, the old one can be repaired almost an unlimited number of times. If we assume that five is actually a lifetime set.
In some cases, the following method gives excellent results - we take out the carburetor, remove all the membranes (top and bottom), and then leave what is left to soak in acetone for several hours. Often, foreign objects and substances simply get into the jets and channels (sometimes, for example, traces of sealants are found there!). Therefore, simple cleaning has an excellent effect. No costs and no membrane changes. Although the decision to replace them must be made locally, guided by their condition.
Surprising as it may seem, it is quite. This unit has practically only one requirement - the accuracy of its manufacture. In terms of geometry, as a rule, everything is fine with him. It does not bear any excessive mechanical or chemical loads. Therefore, a simple replacement may well be an appropriate option to permanently extend the life of a chainsaw that costs quite decent money.
VIDEO
Despite the many varieties of modern building materials, wood remains the most demanded. In this regard, chainsaws are in great demand among fellers, owners of their own houses and summer residents.
Among the huge variability of the model range, the most popular among both amateurs and experienced foresters for many years has been the calm 180 chainsaw, which is distinguished by its simple maintenance, repair and operation.The Stihl company was founded more than 9 centuries ago and began production of gasoline chain saws back in 1926. Thanks to many innovations, simplicity and durability, the tools of this manufacturer are in demand on the world market of woodworking equipment.
Before starting work on the diagnosis of malfunctions and their elimination, it is necessary to prepare the necessary tools.
General view of the Stihl MS 180 chainsaw with the main units
Due to the fact that the chainsaw is a relatively simple unit, the list of accessories includes the following items:
a set of flat and Phillips screwdrivers;
open-end locksmith keys;
candle key;
set of sockets with a knob
Multifunctional tool Stihl.
Multifunctional tool calm
In order to qualitatively eliminate the emerging breakdowns and restore operational indicators, it is necessary to establish as accurately as possible the malfunction preceding the failure of the unit. Following from the fact that the chainsaw is equipped with an internal combustion engine (ICE), the main causes of breakdowns should first of all be looked for in the power unit.
Before starting work, it is necessary to turn off the engine, let it cool down and exclude the possible start of the chainsaw. It is recommended to wear cotton gloves to protect your fingers.
The most common faults when repairing a chainsaw calm 180 include:
the engine does not start;
the operation of the motor is intermittent, with a short operation of the chainsaw, it spontaneously stalls;
oil leaks near the chain lubrication mechanism;
the engine does not develop full power.
Frequent breakdowns of the transmission part of the saw include rupture of the chain links. You can independently restore its integrity by riveting the links or replacing it with a new one.
Despite the relative simplicity of the design and the absence of complex mechanisms, experts recommend searching for faults in a specific order. First of all, the presence of a mixture in the fuel tank is checked, and if everything is in order with the liquid level, it is necessary to proceed to inspecting the chainsaw start unit. If this mechanism is also in good condition, it is necessary to check the performance of the spark plug.
After the performed manipulations to diagnose the spark plug (determining the presence or absence of carbon deposits, the correct gap between the electrodes, the state of the sealing ring), we turn our attention to the carburetor. Small sawdust, dust and soil particles often clog the fuel system.
If cleaning the carburetor of the stihl 180 chainsaw did not help to restore the previous performance of the unit, the reason probably lies in the cylinder-piston group (CPG). The power unit belongs to the most complex mechanism of the tool, the diagnosis of which requires almost complete disassembly.
The first step in diagnosing the fuel supply system is to check the level of the fuel mixture in the tank.
The main nodes of the fuel system of the chainsaw 180 calm
Even if the owner is confident in the presence of gasoline, this allows you to eliminate the vacuum created as a result of a clogged bypass valve. It is designed to optimize the pressure in the tank with fuel consumption. For the convenience of cleaning the breather, chainsaws use a regular medium-sized sewing needle.
When inspecting the fuel system, you should pay attention to the integrity of the pipes, the tightness of which can be violated by mechanical damage or prolonged operation of the unit. Sometimes the cause of the mixture flowing out and, as a consequence, the incorrect operation of the engine, is the wear of the rubber gaskets and the primer (suction button). In this case, to repair a calm 180 chainsaw with your own hands, you need to purchase a repair kit of seals and replace them.
VIDEO
The cause of problems with a chainsaw of this model may be the inoperability of the ignition system and the engine start unit.
General view of the ignition of a chainsaw 180
If, when measuring the gap between the flywheel and the module, no deviations are found, you must pay attention to the spark plug.
Most manufacturers, including calm chainsaws, recommend setting a clearance of 0.2 mm. This requires a coin, coin wire, or flat dipstick, which can be purchased at any automotive store.
VIDEO
Chainsaw starter Calm 180 assy
Having dismantled the candle from the mine, we measure the gap of the chainsaw candle between the central and side electrodes. If its value is excessive (more than 0.7-1.5 mm), a spark may occur periodically, and if it is minimal (less than 0.7 mm), it may be insufficient for optimal ignition of the fuel mixture.
If gasoline enters the combustion chamber, and no inconsistency in the ignition system has been identified, the carburetor may be the likely cause of failure. This unit is designed to mix fuel with air and supply them to the cylinder. After dismantling the carburetor, we clean its channels and jets using universal tools.
It must be remembered that the carburetor consists of many small parts, and therefore its dismantling, disassembly and cleaning require special care.
After diagnosing the ignition system of the chainsaw calm 180 and its restoration, we proceed to troubleshooting the power unit, namely in the cylinder-piston group of the saw.
During operation, parts of the cylinder-piston group of the saw fail due to friction forces, high temperatures and loads. If the tool does not reach full power at startup and stalls at idle speed, a possible problem could be damage to engine parts. To disassemble the power unit, it is necessary to unscrew 4 bolts and remove the cylinder. The owner is required to carefully inspect its inner work surface for chips, nicks and cracks.
Even the slightest damage to the "mirror" of the cylinder can negatively affect the compression of the chainsaw engine and its performance.
Cylinder-piston group of the Stihl MS180 chainsaw
When diagnosing an internal combustion engine, we also perform a visual inspection of the piston and compression rings. Made of aluminum alloy and cast iron, respectively, they are more exposed to abrasion loads than a steel cylinder. In case of breakage and excessive wear of the piston rings, they must be replaced.
If, upon visual inspection, the ovality of the cylinder working surface is observed, it will need to be bored. To do this, we measure its diameter over a larger size, select the piston and perform the subsequent machining.
VIDEO
In the process of sawing wood, the cutting part of the tool is subjected to high loads. In order to reduce frictional forces and the subsequent wear of the chain, the chainsaw calm is equipped with a lubrication system that gradually supplies oil to the tire. The rapid loss of cutting properties by the teeth and the absence of traces of lubricating fluid may indicate its leakage or clogging of the pipes.
Stihl 180 chain lubrication principle
First of all, when diagnosing the chain lubrication system for the ms 180 chainsaw, we pay attention to the oil supply hoses and their fixation points. Damaged connections cannot be repaired and must therefore be replaced. The oil passages can be cleaned with compressed air. For these purposes, we use a compressor or an ordinary car hand pump.
Due to its ease of operation and repair, the chainsaw of this model has gained wide recognition among professionals and amateurs in the field of woodworking.
The Stihl 180 chainsaw is a versatile garden tool that is widely used in the garden. So, it is used for cutting firewood, pruning trees and other green spaces.
The Stihl 180 chainsaw is no less popular both in construction and in farming. It is very convenient and easy to operate.It also has a low cost, which makes it more affordable for the population.
Unfortunately, no matter how high-quality the tool is, it breaks sooner or later. This may be due to wear or deterioration of parts as a result of frequent use.
Some faults can be fixed at home. But, in order to repair a chainsaw with your own hands, you need to know the structure of the tool, as well as the most frequent breakdowns and how to fix them.
Often in a chainsaw, calm 180 damages the oil system. Such a malfunction can be determined by the dryness of the working circuit or the presence of a leak.
The solution to this problem must be started with a thorough examination of the hose through which the oil is supplied. The connection of the hose to the fittings is also amenable to inspection.
In the process of inspecting and repairing the oil system, it is also necessary to clean the filter. Contamination often results in poor oil flow.
If there is an oil leak, it means that the system is not tight. This primarily applies to the hose and oil channels. Most often, such malfunctions occur as a result of mechanical damage to system elements.
The process of removing and cleaning the air filter
If, as a result of inspection, a violation of the integrity of the hose was determined, then it is replaced. If the damage is minor, then it can be hidden with a sealant. This radical way will reduce the cost of repairs.
If, as a result of pressure on the gas, the chainsaw begins to stall, then the problem lies in the carburetor. Also, a sign of a malfunction of the carburetor may be a protracted start of the chainsaw and the impossibility of gaining speed.
Most often, such a malfunction occurs as a result of wear of the rubber cuff, which is located on the piston of the fuel booster. As a result, air is sucked in when starting the tool. Basically, such a breakdown occurs after several years of using the chainsaw.
The elimination of this malfunction is carried out in the following sequence:
Remove the carburetor. Remove the screw that holds the membrane cover. Turn carburetor so that pin is visible. From it you need to remove the retaining ring and disconnect the air damper spring. Then the throttle valve. To do this, you need to unscrew the screw that holds it. The next step is to remove the damper axle.
Pull out the accelerator with the spring. It has a cuff. The wear of this particular element leads to air leaks and engine stalling after a recent start. The piston with the cuff must be replaced.
Assemble the carburetor in reverse order and install it on the chainsaw.
Step-by-step disassembly of the carburetor
Now we know how to fix a common carburetor malfunction. Observing all the rules, you can easily do these works with your own hands.
Our next article tells about how to repair a Partner 350 chainsaw.
Chainsaw ignition system
If the tool does not start, then the problem may be hidden in the starter mechanism or in the ignition system. In the event that the starting device works normally, then it is necessary to carefully inspect the spark plug. It needs to be unscrewed and carefully inspected.
Particular attention should be paid here to the electrodes, on which plaque can accumulate. If there is a red-brown coating on the electrodes, then this indicates a serious malfunction of the entire starting system. So, the cause of the malfunction may lie in the carburetor.
If the ignition system works normally, but the tool does not work properly, then the problem may be associated with an excess of air-fuel mixture. Here you need to adjust the carburetor and clean the jets.
Do-it-yourself chainsaw carburetor adjustment
If, during the inspection, carbon deposits were found on the spark plug, this means that the tool runs on low-quality gasoline.This may also be due to the malfunctioning of the carburetor.
To solve such a problem, you need to take the following steps:
remove the carburetor and check it;
if necessary, clean and adjust it;
replace fuel;
install the carburetor and check the tool in operation.
It is worth noting here that the carburetor is a rather complex unit. Therefore, if there is a need for its repair, it is better to seek help from specialists.
And in this article, you can learn how to make a manual garden drill.
With this information, you can repair the calm 180 chainsaw at home. Of course, you need to take into account that it is better to eliminate more serious malfunctions at service centers.
See overview video about the diagnosis of the lubrication system of the Stihl MS180 chainsaw:
VIDEO
The Stihl 180 is a German chainsaw designed for gardening, logging, site clearing and other woodworking. Many people love it for its compactness and ease of use. The instrument combines seemingly opposite qualities - power and maneuverability. German designers have tried to create this sample, but the MS 180 Stihl also has drawbacks that users face in various operating modes. Like all mechanisms, it tends to fail. What to do in such cases and is it worth contacting the workshops?
Many owners of this saw faced its malfunctions, and immediately gave their tools to special workshops. Of course, they will subdue her there quickly and for a long time, but sometimes you can fix a breakdown yourself, without anyone's help. This does not require any special tools or deep knowledge in the device of chainsaws. You just need your accuracy and "straight" hands. However, do not forget that not all breakdowns can be corrected on their own; some operations require expensive equipment and deep knowledge of mechanics. In such cases, it will still be easier to visit the service station or the store where the chainsaw was purchased (if the warranty period for the product has not yet expired).
VIDEO
Most malfunctions arise from clogged nozzles or worn membranes. Anyone can solve these problems by cleaning valves and replacing obsolete elements. And if the repair of the chainsaw gets out of control and the saw carburetor finally breaks down, then at any time you can buy the same carburetor in any technical store (the price for them does not exceed 700 rubles). So don't hesitate to take on DIY repairs!
Faults that can be solved by repairing the carburetor: It is worth noting that the diagnostics may not always correctly indicate the problem. There are times when, due to different reasons, the same "symptom" occurs. And sometimes diagnostics can give false information, as a result of which you will not be able to correctly eliminate the cause of the breakdown. Give diagnostics due attention, but do not overestimate its importance.
The tool does not hold idle revolutions, and sometimes the revolutions "walk". Most likely the idle jet is clogged. It is urgent to clean it, otherwise the saw will not be able to perform its functions. Another possible cause is a malfunction of the fuel system.
Sometimes this problem is solved by unclogging the valve that limits the fuel tank. This valve regulates the output of gasoline and the passage of air. Do not forget to adjust the carburetor by changing the amount of air that is supplied to it. More details about this operation can be found in the instructions included with the brand new chainsaw.
The Stihl chainsaw carburetor, without disassembling, can only be adjusted by the number of revolutions produced at idle. It is impossible to increase or decrease the fuel supply in various modes.Manufacturers have limited access to this adjustment by removing special screws. If faults are found in this system, it is possible, with experience, to increase the gap between the needle valve and the wall.
The tool began to consume more fuel, while its power was significantly reduced. Gasoline consumption and power are subjective terms. To accurately determine these indicators, one cannot do without visiting special firms specializing in this instrument.
Well, if these two indicators are visible "on the face", then follow these steps:
✔ Check if the chain is blunt. A dull chain has a lower efficiency, and therefore the saw consumes more fuel.
✔ Inspect the fuel tank. Perhaps it has formed a small mechanical damage, through which gasoline escapes imperceptibly.
✔ Inspect the muffler carefully.
✔ Clean the cooling system and exhaust system.
✔ The unit stalls immediately after operation or warming up. Experts call it hot.
The most common reasons are:
Breakdown of the cooling system (overheating). It is possible that foreign objects have entered the cold air pipes and must be removed.
Chainsaw stalls when position is changed. This only applies to tilting to the side, in the vertical state the saw functions normally. This problem even applies to serviceable chainsaws, because during the development the designers made a small mistake. The Stihl 180 fuel system has a special design, in which the fuel cannot escape from the tank on its side. Sometimes the problem lies in the clogging of the fuel pump.
The procedure for parsing, as well as setting the carburetor of the Stihl 180 chainsaw: In order to carry out a high-quality repair of the carburetor, you will need to remove it. This is not difficult to do, but you need to be extremely careful. First, we will prepare the workplace: install the lighting, lay out all the necessary tools. Understand that the carburetor is the main saw unit where the fuel and gasoline flows intersect. For stable operation, they must be cleaned of foreign debris.
VIDEO
Therefore, before the main work, you need to do the following:
Remove and clean the muffler.
Make sure there are no problems with fuel supply and combustion.
Check the serviceability of the air and cooling filters.
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Chainsaw Calm 180 - device and carburetor adjustment
The stihl ms 180 chainsaws are designed to make their use as easy as possible for inexperienced users. For this, some of the settings available on the more powerful Stihl models have been abolished in the saw carburetor. But there is still an opportunity to adjust, and repairs, as well as adjusting the carburetor of the chainsaw calm 180 with your own hands, is possible.
First, it is worth deciding why it may even be necessary to adjust and repair the stihl ms 180 carburetor at all. So, this must be done in the following cases:
if the chainsaw does not idle;
repairs may be required if the saw does not start;
there is a loss of power;
increased fuel consumption;
the chainsaw does not reach maximum rpm.
stalls when accelerating.
This list can be continued for a long time, but we have identified the main reasons. Before proceeding with the adjustment, you need to know what the main parts are. carburetor on the chainsaw calm 180, and who produces it.
So, the stihl ms 180 carburetor is developed and manufactured by a subsidiary of Stihl, called Zama. Original carburetors have a company logo on their body, which guarantees the quality of products.
A fuel pump is installed directly in the carburetor body, which operates under the action of an air pulse from the crankcase of the chainsaw, which is transmitted through special channels.A diaphragm is installed in the pump, it is she who is responsible for pumping fuel under the action of an impulse. A gasket is installed between the diaphragm and the body, which is responsible for the tightness of the fuel pump.
In the distribution chamber, as in the fuel pump, there is also a membrane that opens and regulates the fuel supply by pressing a special rocker arm, which raises its needle valve.
The cover of the chamber is the compensator body, which is attached to the carburetor with four screws; a gasket is installed between the body and the cover, which increases the height of the chamber and is responsible for sealing.
The fuel injector is mounted in the carburetor body in such a way that it is a connecting link between the distribution chamber and the cavity in which the throttle valve is installed. Simultaneously with the fuel, air is supplied to the nozzle and an air mixture is formed. The injector has a check valve that blocks the flow of air in the reverse sequence, that is, from the throttle chamber to the distribution chamber.
The throttle valve is installed in the carburetor body and is responsible for increasing the supply of the fuel mixture directly to the engine cylinder. At the moment of pressing the gas, the throttle valve opens slightly, thereby increasing the throughput of the channel and the fuel from the carburetor cavity, rushes into the cylinder in a larger volume.
Combustion of a larger volume of fuel increases the amount of generated energy, which affects the power and speed of the processes. The damper is installed on the shaft passing through the entire carburetor body. At the exit of the shaft from the body, a mount for the gas cable is installed, next to it is a cone-shaped adjusting screw responsible for adjusting the idle speed. By tightening the screw, you can slightly adjust the position of the shaft and the damper installed on it, thereby increasing or decreasing the idle speed, slightly opening or vice versa closing the damper.
VIDEO How to repair carburetor on a chainsaw Calm ms 180 .
VIDEO the main Stihl 180 chainsaw carburetor malfunction .
The carburetor choke is installed on the opposite side of the throttle and is responsible for starting a cold engine, it is controlled by the engine control lever. For a cold start, the air damper is completely closed; for normal operation, it is opened.
The Stihl 180 chainsaw carburetor, indiscriminately, can only be adjusted by the number of idle revolutions. It is impossible to increase or decrease the fuel supply in different modes using special screws. The manufacturer restricts access to adjustments and does not install these screws. How to adjust the carburetor to the correct idle speed is described in great detail in the manufacturer's instructions.
In the event of certain malfunctions, and experience, increase or decrease fuel supply it is possible by increasing the clearance when opening the needle valve.
To increase the flow, the rocker needle valve in the distribution chamber, it is necessary to bend up, and to decrease, down. This regulates the stroke of the needle and, accordingly, the throughput of the valve.
You should not carry out the adjustment yourself, since this must be done very accurately and in case of an error it is almost impossible to return the original position of the rocker arm.
After we have examined the carburetor device, it will not be difficult to determine the reason why fuel enters the combustion chamber in a larger volume. This is due to the wear of the gasket between the compensator cover and the carburetor body. How can this affect you, you ask?
The answer is simple, by contracting, the gasket releases the diaphragm on top of it a fraction of a millimeter down. She, in turn, will press harder on the rocker needle valve , it will open more than it should be and the fuel will be supplied in excess (it will start to overflow).
Another reason is the stretching of the diaphragm itself, this occurs as a result of natural wear and tear. It is impossible to prevent this process, but you can solve the problem by periodically changing all the gaskets, carburetor diaphragms, and the fuel pump. There is a repair kit for this.
When cleaning the chainsaw with compressed air, never blow into the fuel pipe, as this can stretch the diaphragm.
A common reason for the failure of the carburetor on a chainsaw calm is the sticking of the valve in the nozzle. The reason for sticking is a violation of the storage of the chainsaw, or rather the manufacturer's instructions Calm 180 on the correct preparation for storage.
As follows from the instructions, before long-term storage, it is necessary to drain the fuel from the tank, then start the saw and burn the gasoline from the carburetor. Failure to comply with this elementary rule entails the following consequences. The forsknui valve, being in direct contact with the fuel, sticks to the body, since the gasoline evaporates little by little and only sticky oil remains. It is impossible to replace the nozzle, since they are not in the repair kit, you can only try to knock it out and rinse it, which is not always possible to do without damaging the nozzle.
In cases where it is necessary to clean the Stihl 180 carburetor or disassemble it, first you need to remove the unit from the chainsaw. This must be done in compliance with a certain algorithm of actions:
Put the protective cover for the chainsaw on the tire.
Remove the top cover of the chainsaw.
Remove the two nuts securing the air filter and carburetor.
Remove the air filter housing.
Disconnect the wire from the engine control lever.
Carefully remove the lever from its seat in the housing, while simultaneously disconnecting the choke rod from it.
Pull the carburetor towards you and disconnect fuel supply as well as throttle thrust.
To facilitate dismantling, you can additionally untwist the rear handle and disconnect the throttle rod first from it, and then only from the carburetor. This may be required, because without some experience, disconnecting the rod from the carburetor is quite problematic and it is easier to disassemble the handle first.
To install the part in place, follow the reverse order of the algorithm.
When removing and installing the chainsaw engine control lever, you should be extremely careful, since the seat on the saw body is the weak link of the saw, and very often inexperienced users break it.
In order to purge, change gaskets or the needle valve, the carburetor must be disassembled. To do this, unscrew 4 screws on the expansion joint cover and one on the fuel pump.
Having opened the case, you should be extremely careful, because if debris gets into the inside of the carburetor, it will make its work impossible. The thickness of the channels in it is comparable to the thickness of a thread or even a human hair.
A video for repairing a calm 180 carburetor can be viewed below. In it, the master tells in detail about the problems and clearly demonstrates the entire repair process.
Video (click to play).
In conclusion, I would like to note once again that the Stihl carburetors, which are manufactured by its subsidiary Zama, are very reliable. With proper operation and storage, they are able to serve the entire period allotted to the chainsaw without repair.
