STIHL 180 chain spins at idle speed

Reasons why the STIHL 180 fails to rev

Virtually every hand-held gasoline-powered tool is powered by a two-stroke engine. These engines have advantages over four-stroke engines. They are lighter in weight but have the same power. But they also have disadvantages in the form of adding oil to gasoline and lower fuel economy. There are a few basic rules and behavioral issues that are known to malfunction:

• Engine won’t start. Cold start and hot start are different. The cold engine starts with a choke that reduces the air intake and increases the proportion of gasoline in the fuel-air mix.
• The chain saw starts and stops before it reaches the necessary rpm. Having to constantly work the throttle trigger, maintaining high revolutions.
• Engine stalls under load, does not develop optimum power.

Faults can be caused by mechanical reasons, as well as problems related to electrical equipment.

Visually inspect the spark plug

Visual inspection of the spark plug can tell you a lot about engine performance:

A damp working part that wraps around the cylinder indicates a malfunction in the power system. The fuel mixture is too rich. The carburetor needs adjustment. Or wrong oil to gasoline ratio. Oil is poured more than normal and does not have time to burn off during the piston’s stroke. Carbon deposits appear.

Clean it off with sandpaper. Never use an acetylene or gasoline torch to ignite the spark plug. The internal part of the spark plug may have separated.

The chain saw does not decelerate. how to find and repair the fault?

The most common cause of this frequent breakdown is an improperly adjusted choke. This is needed to draw in air which is needed by the carburettor to enrich the fuel mixture with air. To adjust the choke, you need to adjust the carburetor. In this case, special attention should be paid to the operation of the power unit at idle speed. To check the engine operation in idle mode, you can pay attention to the state of the circuit immediately after starting the engine. If it spins, then the power unit will need to be adjusted.

Another reason for this typical malfunction is air intake. If there is an air leak in one of the mechanisms of the chainsaw, the mixture will automatically be depleted, which will lead to a spontaneous increase in the revolutions of the motor of the chainsaw. In this case the operator will need to carefully check the entire fuel system, including the carburetor, pipes, working chambers of the unit.

In some cases, the chainsaw does not decelerate because the gas pedal cable is jammed. And the power unit will rev up to its maximum speed as soon as it is started. The problem can be solved by disassembling the gas handle and examining the whole gas delivery mechanism. A jammed cable may need to be adjusted or fully replaced.

Characteristics and possible causes of failure. Fixing the problem with your own hands

Gasoline-powered saws are quite reliable and lightweight designs. Therefore, if you properly care for them and treat them according to the manufacturer’s advice, then they fail very seldom and fairly quickly eliminated various kinds of failures. But if you are faced with this situation and want to repair your own tool by 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 shuts down when you press the gas, because there are many reasons for this. But we should not forget that based on the fact that gasoline saw is armed with a regular two-stroke engine, for its effective performance are important conditions such as: lubrication, fuel, spark and air.

The gasoline tank of a chainsaw

As follows, the manufacture of fuel-air consistency is engaged specifically carburetor, the filter produces purification of air from dust, ignition unit and spark plug makes the spark, and gasoline is the lubricant.

That’s why the search for the circumstances of this kind of failure should be carried out in turn, starting specifically from the easy and evenly proceeding to the difficult. And it is a fundamental factor in the proper repair, because the one man who, without thinking begins to engage in disassembly of the carburetor, leads her to risk. Because this kind of machine has to be repaired or adjusted in a garage (read about adjusting the carburetor).

• It is important to know that in order for the tool to work flawlessly, you need to be very attentive to the fuel itself. Because if this kind of mixture will not be prepared properly, most chain saws simply will not start. Consequently, not every owner would think to look for the cause of failure in the fuel. That’s why you need to use only high quality gasoline to mix your tool properly at all times.

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Why the chain saw does not pick up speed?

Starting is a complicated, multilevel process that involves almost all of the chain saw’s life-support systems. That is why the fact that the chainsaw loses speed, starts up irregularly and feels safe only at idle should be considered from different angles.

• A faulty engine. its engine life could be exhausted and the piston rings and cylinder could be worn, deformed or even corroded;
• a defective spark plug or coil itself. as a result, the spark needed to ignite the fuel-air mixture is not generated;
• unbalanced carburetor screws, as well as a number of causes that could lead to failure of the carburetor.

Reference!

You may need to adjust the carburetor on your STIHL chain saw if the fuel quality or altitude changes, the STIHL chain saw is running low (no air pressure), or if atmospheric pressure, temperature, and humidity change. Tuning your chainsaw’s carburetor makes it possible to get good gasoline performance as environmental conditions worsen. Also adjusting the carburetor on your chainsaw helps prevent oil starvation and engine damage caused by insufficient lubrication that enters the cylinder with depleted fuel consistency.

STIHL chain saw idle speed adjustment video.

Tip: To check the tightness of the engine terrific use a special device, t.е. a special pump with a pressure gauge. At first, you must remove the carburetor on the chainsaw, and install a sealed plate plug with a flange to connect the hose from the pump on the cylinder inlet window. Spark plug for tightness is also an option to put on sealant. You must also remove the muffler, and install a sealing plate with a rubber gasket on the cylinder exhaust window. Then you have to put the piston in the top dead center and connect the hose from the pump to the flange. Next, you need to pump air into the engine to 0.9 atm. and look at the manometer pointer. if it stands on one place, it means that the engine piston is tight. Then let air out, switch device (pump) and start pumping air out of the cylinder, creating vacuum in the engine with manometer reading in.0.5 atm. We look at the arrow of the manometer. if it is in the working place, it means that through the glands or other seals in the engine there is no air leakage (which aggravates the work of the chainsaw does not give the right to make adjustments to the carburetor chainsaw). check the engine for air leakage and compression.

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How the STIHL 180 works: design, principle of operation

The STIHL 180 chain saw carburetor includes the following main components

• fuel pump (with internal diaphragm);
• the main (diaphragm) chamber;
• diffuser;
• Throttle and air valves;
• needle valve;
• fuel injectors;
• Fuel injector with valve;
• adjusting screw for idle speed.

The principle of operation is as follows. A special channel in the carburetor connects the carburetor’s crankcase with the fuel pump. Through the alternating stroke of the piston in the crankcase of the engine, a vacuum is created. By which the fuel pump raises the diaphragm and opens the valve to deliver fuel to the carburetor.

Fuel then passes through the filter element (wire mesh) and enters the main chamber through a special channel. In this chamber there is a control diaphragm, which regulates the fuel supply by pressing the rocker arm, which in turn lowers the needle valve.

For raising the control diaphragm is responsible for the vacuum generated in the carburetor diffuser due to the turn of the air, throttle valve. As soon as the engine is started, the mixture must be lean. Lower the choke, the vacuum in the diffuser is minimal, the diaphragm falls into place.

Fuel flows from the main chamber to the diffuser with the help of nozzle with check valve, or through nozzles at idle stroke (when the gas throttle is closed). There it mixes with intake air and the ready mixture enters the engine cylinder. The check valve prevents air from the nozzle from getting into the main chamber.

Throttle choke

Tuning STIHL Saw Carburetor Tuning Your Saw’s Carburetor. Or how not to pay repairmen! Owning a chainsaw makes life a lot easier, even for the amateur, and in some professions this tool is virtually indispensable. However, like any relatively complex device, the chainsaw requires periodic maintenance. Because of untimely or not the best quality maintenance.

How to Adjust the Carburetor on a STIHL Lawn Mower 3 Grass cutter carburetor adjustment do in home conditions, lawn mowers, as well as all gasoline tools for the garden, is not difficult in service technique. You can fix it, tune it up without the help of others For example, adjusting the carburetor of a lawn mower at home. a matter of 5 minutes. The lawnmower carburetor is a part of the power system.

How to Adjust the STIHL Fs 3 Lawn Mower Carburetor lawn mowers, just like all lawn and garden tools, is not a complicated technique to maintain. To fix, adjust without the help of others is possible and necessary. For example, adjusting the lawn mower’s carburetor yourself is a 5 minute affair. The lawnmower carburetor is the hub in the power system. In a personal computer, as well as all carburetors, goes.

The throttle valve, installed in the carburetor body and is responsible for increasing the flow of fuel consistency specifically in the engine cylinder. At the moment of full throttle, the choke opens, increasing the flow capacity of the channel and the fuel from the carburetor cavity rushes into the cylinder in a larger volume.

Combustion of a greater volume of fuel increases the amount of energy produced, which affects the power and speed of processes. The choke is mounted on a shaft extending through the entire carburettor body. At the outlet of the shaft from the housing, there is a mount for the throttle cable, next to it there is a cone-shaped, adjusting screw responsible for the idle speed adjustment. By tightening the screw of course slightly to adjust the position of the shaft and a damper attached to it, thus increasing or otherwise reducing the idle stroke, opening or otherwise closing the damper.

The chainsaw does not start

When a chainsaw has difficulties with starting, many people blame the carburettor at once. Actually there are several variants, and the cause of failure can be anything:

• Clogged air and/or fuel filter. The problem can be solved by filter cleaning.
• No fuel in the tank. Yes, there is a reason. some owners forget about such an insignificant detail, as the filling of gasoline chainsaw and think that a couple of liters of gasoline enough for six months. Also, the fuel in the tank does not have to be stored for more than 14 days, i.e.к. Gasoline evaporates and loses octane rating.
• Check the pipe from the fuel tank to the carburetor. it could be forgotten or broken, so the gasoline does not flow into the tank.
• There is a spark on the spark plug. Why is there no spark? There could be many reasons: no contact, a spark plug needs changing or it is flooded. Why a spark plug fills up on a chainsaw. this is another question. But if this happens, you need to dry and re-set, and then check the presence of the spark. If there is heavy soot on the spark plug, it is recommended to replace it.
• Check the muffler for carbon build-up. If there is soot, clean the muffler thoroughly, but it is still recommended to take the chainsaw to a service center to have the cylinder and piston checked there, because.к. carbon deposits are a sure sign of improper operation of the elements of the cylinder and piston group.
• forgot the carburetor. How to properly adjust the chainsaw, so that the carburetor works well, was considered in a separate article.

If none of the above methods did not help, then the cause is more serious. the failure of one of the nodes of the connecting rod and piston group. In this case it is recommended to take the chainsaw to a service center.

Sawing crooked

Let’s see why the chain saw cuts awry. It shows up when cutting under load, when the bar is pushed to the side a little bit. This is especially noticeable when dusting a wide barrel by double-cutting, first from the top, then from the bottom. The result is an uneven cut surface that in some cases is unacceptable. Example. facing bars.

• Uneven sharpening of saw teeth. This is the most common reason why the product is skewed. Teeth should be ground to the same distance to avoid problems in sawing. Optimal solution is to get a sharpening machine that adjusts to the most worn tooth. Or contact a sharpening machine shop, which has such equipment. The result is that all teeth are the same size.
• The chain or guide bar you are using does not fit the parameters. The width of the groove must be considered when purchasing these items. It is important not only for the proper operation of the equipment, but also for the safety of the cut.
• Saw headset of the device is badly worn. If the unit does not cut well, there may be excessive wear on the headset. Visual inspection will indicate the problem. If the right or left side of the tire is more worn, it must be replaced with a new one. If there is increased wear, it makes sense to do a complete diagnosis of the lubrication system. This is often the cause of increased wear on one side of the chain.

If this is a complicated repair, it is best to have the machine repaired in a specialized shop.

Chain does not rotate

Why a chainsaw chain does not 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 chaindoesn’t turn on chainsaw. In either case, you need to assemble the sprocket to figure out the exact reason why the chain won’t turn. If the crown is worn, the sprocket must be replaced (or the crown if the sprocket is prefabricated).
• Brake chain is jammed. As a result, the sprocket is blocked by the brake mechanism while 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 will the sprocket, since many elements can melt and overheat due to the high temperature.

Chainsaw design and general fault classification

Correctly find the source of failure, as well as perform correct and good repair chainsaws, for this you need to have a reliable understanding of its technical specifics. Repair of such equipment is not particularly difficult. Its schematic design is quite simple. For convenience, the nodes in its composition can be divided into three types:

• the main and very important element, without which further work is impossible, is the engine, a two-stroke, gasoline-powered. Permissible brands of gasoline are specified in the very passport of the device;
• Second, no less important component is the operating part, which is responsible for sawing the material itself. This can include sawing mechanisms;
• the third linkage includes the fuel and oil supply and filtration system, engine ignition, exhaust, etc.д.

Malfunctions are classified into two units:

• Malfunction of the engine itself. Can not start, without any reason to shut down, excessive heat, very much smoke, unstable operation with minimum and maximum load. Therefore these components should be repaired.
• Malfunctions in the periphery. Here you can identify a variety of symptoms that cause malfunctions in its operation. If, for example, the chainsaw stops when it is running or loses power, there may be a clog in the gasoline system or filter. If it’s not cutting well, it might just be a dull chain. Repair should begin with the study of auxiliary components, which will require the least time and money.

For convenience, before you start the repair, you should divide the chainsaw into sectors and look for faults directly there, where the problem is supposed to be. This manual also gives you a quick refresher on what might go wrong and how to fix it.

It should also be borne in mind that the sources for the same failure can be several factors. Therefore, it is important to be able to diagnose the cause of the failure, in order to further perform repairs correctly and qualitatively. Before you start disassembling and repairing a chainsaw, you should estimate the possible causes and try to work only with them.

How to rule out the possible risks of buying a counterfeit tire?

In the information field there are signs, by which it is easy to distinguish the original brand chain saw from the most reliable fake. As for tires, their advantages and disadvantages are manifested directly in operation.

In the domestic market of home appliances about 15% of the total sales volume of chainsaw parts is an unknown third-rate counterfeit of third-grade origin, producing a standard resource in the best case by half.

It is not economical or safe to operate a chainsaw with a counterfeit guide bar and chain. A significant portion of injury situations are created when using a tire and chain counterfeit.

Buy a quality and durable brand-name tire of the right model, without significant risks can be in the brand outlet or representative office of a licensed dealer company. In the absence of such an opportunity, you should use the services of a solid, trustworthy online store.

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Chainsaw design and general classification of faults

Correctly find the source of the malfunction, as well as perform a correct and good repair of chainsaws, for this you need to have a reliable understanding of its technical specifics. Repairing this kind of equipment is not too difficult. Its schematic structure is quite simple. For convenience, the nodes in its composition can be divided into three types:

• the engine is the main and very important element, without which no further work is possible. a two-stroke petrol engine. The permissible gasoline grades are listed in the data sheet itself;
• The second, no less important component is its working part, which is responsible for sawing the material itself. This can include sawing mechanisms;
• The third linkage node includes the fuel supply and filtration system, oil, engine ignition, exhaust, etc.д.

The malfunctions are classified into two parts:

• Malfunction of the engine itself. Can not start, without any reason stalls, excessive heat, very strong smoke, unstable operation at minimum and maximum load. Consequently, the repair should be carried out these nodes.
• Malfunctions in the periphery. Many symptoms can be identified here, by which malfunctions appear in its operation. For example, in the case of stopping the chainsaw while working or losing power, it is possible that there is a clogging of the gasoline system or the filter. If it doesn’t cut well, the chain may just be blunt. Repair should begin with a study of auxiliary components, which will require the least amount of time and tools.

For convenience, before you begin repairs, you should divide the chainsaw into sectors and look for faults directly where the problem is suspected. The manual also gives a brief description of possible breakdowns and how to fix them.

It should also be borne in mind that several factors can be the source of one and the same malfunction. Therefore, it is not unimportant to be able to diagnose the cause of the breakdown in order to perform the repair correctly and properly in the future. Before you start disassembling and repairing the chainsaw, you should figure out the possible causes and try to work only with them.

How to exclude possible risks of buying counterfeit tires?

The information field contains indications that are easy to distinguish between an original, brand-name chainsaw and the most authentic knockoffs. When it comes to guide bars, their strengths and weaknesses show directly in operation.

In the domestic market of home appliances about 15% of the total sales volume of chainsaw parts is an unknown third-rate counterfeit, producing a standard resource in the best case by half.

Operating a chainsaw complete with a fake bar and chain is economically unprofitable and unsafe. A lot of injuries are caused by counterfeit tires and chainsaws.

You can buy a quality and durable brand-name chain saw of the required model without considerable risks at a brand outlet or representative office of a licensed dealer company. In the absence of such a possibility should use the services of a solid, trustworthy online store.

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Air filter

On the pages of the World Wide Web, one can find information that the STIHL 180 chain saw can shut down because the air filter is very dirty. I would like to refute this misleading information and inform you that the STIHL MS 180 carburetor is fitted with a compensator which is designed to bypass a clogged air filter in order to get the air flow required for normal STIHL 180 chain saw operation. Of course the power will drop a little with a clogged air filter, but it will not stall for sure. Another reason for the loss of power is piston wear and tear. repair of the STIHL MS 180 chain saw piston is necessary.

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If at first signs of power loss (low RPM) with a STIHL MS 180 chain saw, it is absolutely essential not to continue working, but rather to call in a specialist or do some diagnostics and repair the problem yourself. Causes of power loss are not numerous and you can cope with them even without certain skills.

Chainsaw at the cottage, in a private home. not an uncommon occurrence. It can be amateur, semi-professional and professional. The choice depends on the frequency and difficulty of the activity. It greatly simplifies the work on the preparation of firewood, helps quickly put the log. In case of breakdown in most cases, it is possible to repair the chainsaw with their own hands. Equipment failure may be due to idling problems, the machine won’t start or the engine is tripping.

The principle of repair in all chainsaws is about the same. Always read instruction manual before operation. The most complicated part of this kind of equipment is not the repair itself, but the search of the source of failure.