Why does a chainsaw stall when you press the gas?

Checking the main working mechanisms of the chainsaw

If the chainsaw stalls, you need to check the serviceability of its main systems:

Main components of a chainsaw

• fuel tank. The saw will not work properly if there is not enough fuel in it or it is of poor quality;
• ignition coil and high voltage wire. Normally, the spark plug gap should not be more than 0.5 mm;
• carburetor and fuel filter. If the tool does not work due to a malfunction of these mechanisms, you must contact a specialist.

Checking the main chainsaw systems

If the chainsaw stalls immediately after turning on, it means that some part of the equipment has broken down. The cause cannot be identified instantly, so you need to check all the details sequentially.

The first thing you need to do is check the fuel tank of your chainsaw. There may simply not be enough fuel for full operation, so it is necessary to prepare the mixture in accordance with the standards for mixing oil and gasoline. Gasoline must have the maximum octane number, and the oil is usually selected according to the instructions in the owner's manual.

If the reason is not the amount of fuel, then the next cause of failure may be the spark plugs. Not only the spark plugs are checked, but also the high-voltage wire from the tips. The spark plug gap should be no more than 0.5 mm.

If the gap distance is too small, it means that carbon has deposited on the spark plugs, which needs to be cleaned, and then install the parts in their place and check whether the chainsaw starts or not. It is also recommended to replace the spark plugs completely with new ones from time to time, even if they are in good condition.

Another reason that the chainsaw stalls after pressing the gas may lie in a breakdown of the carburetor or fuel filter. Cleaning the fuel filter yourself is quite simple, unlike the carburetor, which has a more complex design and therefore this part is best left to specialists.

Why does the chainsaw not start or stall at idle?

There are times when a chainsaw stalls at idle. Most often, the reason is a dirty muffler, which can be easily cleaned without the help of specialists . You can also solve problems by adjusting the carburetor. On this part of the chainsaw there are two bolts with the letters L and H. The bolt, called L, is responsible for the speed of the chainsaw.

To increase the idle speed, you need to turn the bolt half a turn, and perhaps this will solve the problem. We must not forget that a carburetor is a rather complex system and its adjustment may be beyond the power of an ordinary person. If you set the speed value incorrectly, you can deform the internal system of the chainsaw, so it is better to entrust this work to professionals.

What to do if the chainsaw stalls under load?

Very often, chainsaws with a powerful power device stall due to increased load. The reason here can only be a dirty fuel filter or gas tank .
In case of such a problem, it is best to replace the entire fuel filter, especially since it is not too expensive. If this does not help, then it is recommended to check the quality of the mixture. More precisely, you need to prepare a new fuel mixture by first replacing gasoline. Maybe it’s all about the quality of gasoline, and the low octane number simply does not allow the chainsaw engine to achieve sufficient power under excessive loads.

The chainsaw stalls when the speed increases

In cases where the chainsaw begins to stall at high speeds, you need to check the following details:

• air filter;
• gasoline filter;
• fuel pump.

The air filter becomes very clogged during operation, so it needs to be cleaned and perhaps even rinsed under warm water, but before installing it, the part will need to be thoroughly dried.
After this, the fuel hose is disconnected from the carburetor. If liquid does not flow through it, it means that it is simply clogged and it is recommended to clean it or buy a new hose . If the mixture flows through the fuel hose in full, then the filter does not need to be checked. In all other cases, it is necessary to clean the breather with a regular needle, and replace or wash the gasoline filter.

The reason may even lie in the gasoline pump. We are talking about checking the wear of this part. If fuel leaks through the walls of the gasoline pump, it means it needs to be replaced. If fuel does not seep through the walls, then this is not the reason why the chainsaw stalls at high speeds.

Why does a chainsaw stall when you press the gas?

If the chainsaw stalls when you press the gas, you may suspect insufficient fuel supply to the system. This can happen not only at the time it is put into operation, but also under heavy load that has not previously been observed. This happens when the saw encounters an obstacle in the form of wood that needs to be cut. In this case, it operates at a stronger power than when simply pressing the gas.

Different states of chainsaw spark plugs

When the unit stalls when you increase engine speed, you may suspect that the fuel filter is dirty. You can easily clean it yourself. If a breakdown of the carburetor jet or another element is detected, it is best to take the chainsaw to a mechanic for repair. When the device starts up but quickly turns off, you may suspect that fuel fluid is being poured onto the spark plug. Sometimes the air filter just gets dirty.

If a malfunction is detected with the chainsaw, it should be checked after it has cooled down. It is undesirable to touch hot parts; this can lead to negative consequences.

What to do

The power tool is operated according to the manufacturer's instructions. Only after checking the chain tension does the unit start. At the same time, the filling of the tanks with combustible mixture and oil is controlled, and the device is securely fixed in the hands. If, after following all the rules, the mechanism refuses to work, then the Shtil chainsaw is repaired.

How to start a Shtil chainsaw correctly: instructions

The tool manufacturer has taken every precaution and developed a manual that makes it easy to start the mechanism. The user will protect himself from injury if he follows the suggested frequency of actions:

1. The ignition is turned on and the engine handle is placed in the down position. The flow of atmosphere from the air filter is blocked by the carburetor damper. To properly start a chainsaw, the throttle membrane must be open to enrich the combustible mixture.
2. The lever is set to the start gas position. The starter jerks several times before the first spark appears. If the flash passes, the instrument is ready to start. The mechanism operates at high speeds due to the closed throttle membrane. To transfer it to the idle speed regulation, the throttle trigger is pressed and immediately released. The number of revolutions quickly returns to normal.
3. The standard Shtil MS unit does not provide additional devices to start the chainsaw in the lightweight version.

Idle speed adjustment

Before setting up, carry out maintenance of the tool. To ensure that the idle speed adjustment is effective, preventive measures are taken:

• carburetor cleaning;
• engine flushing;
• cleaning the air filter;
• warming up the engine.

To adjust the operation of the mechanism at idle speed, use the appropriate adjusting screw. Its rotation depends on the required setting:

1. During standard adjustment, the screw is turned counterclockwise until it turns tightly. After this, make 2 circles in the direction of the arrow.
2. If the saw operates at low speeds, then turn the screw clockwise until the chain begins to move. Then make half a circle in the opposite direction.
3. At high frequencies, the regulator is turned counterclockwise until the circuit stops. After this, the rotation is continued another half turn in the same direction.

It will not be possible to adjust the idle speed if there is air leakage into the engine through the gasket, acceleration pump, seals, or for another reason.

Ignition settings

Gasoline engines are equipped with an ignition system that ignites the fuel. The timing of the flash affects the operation of the motor. During mass production in factory conditions, the ignition of the chainsaw is not adjusted. Marks are placed on the corresponding rotating elements, which are aligned during adjustment. Incorrect adjustment leads to the mechanism starting and stalling.

Read also: Soldering lead with a torch video

Before adjustment, check the dryness of the spark plug and the functionality of the ignition circuit. The voltage supply cable to the spark plug is brought to the cylinder with a small gap and the starter is started. If there is no flash, test the cable with a probe. Then check the serviceability of the wire to the shutdown button.

If the cables are not damaged, then check the ignition coil. This is done with a special tester to ring the device. In this case, the indicators on the device must coincide with the technical characteristics of the coil, which are specified in the instructions for use. If inconsistencies are detected, the ignition unit is replaced with a functional device.

The reel can become unusable due to vibration when the tool is dropped or hit, so you need to work carefully.

Replacing crankshaft bearings

First, they measure the compression; if it is not there, then the reason lies in the breakdown of the piston group.

The required pressure in the cylinder should be 8 atm; if it is lower, then the cylinder and piston, rings, and crankshaft bearings may have worn out.

To find out the condition of the piston system, you need to completely disassemble the saw and remove all the main components of the mechanism:

• dismantle the headset, remove the cover on the bus;
• remove the tire guide and tool chain using the wrench included in the kit;
• remove the air filter, remove the spark plug;
• a piston stopper is attached in place of the spark plug to secure the crankshaft;
• remove the clutch, then access to the clutch system is opened.

Rings with bearings are inspected and defects are identified. You can replace it yourself, which will require repair skills, or you can take the tool to a specialized workshop. Assembly is done in reverse order.

Why chainsaw

Does it stall when you press the gas?

Hello! If you find yourself on this web page, then, most likely, your chainsaw stalls when you press the gas, and you would like to find out why this is happening and what to do about it. Anyway, I’ll try to provide you with any help in this dilemma, analyzing the most common causes of such chaos, and similarly ways to eliminate them.

At the beginning, I’ll immediately write for novice users that some chainsaws require the engine to warm up at idle for about one minute before the start of the working day. Until the engine is warmed up, the saw may stall when gas is added.

What is needed if a heated chainsaw idles, but stalls under load, this means that:

• the carburetor is incorrectly configured or clogged - the most common case;
• it lacks air, the consumption of which increases sharply with increasing speed - this means that the air filter is dirty (a rare case, because the filter becomes dirty evenly, so the user first notices a loss of power);
• it does not have enough fuel, the consumption of which also increases with increasing speed - this means that the fuel filter is dirty (also an uncommon occurrence);
• and the worst case is if there is excessive friction between the piston and the cylinder wall due to a lack of oil in the fuel mixture - after such operation of the chainsaw, you will most likely end up having to repair the piston group, because clogs will form on the piston and cylinder walls, preventing the work saws.

KEY-DOP

Let's look at these cases separately.

Checking filters and carburetor

A common cause of chainsaw breakdowns is faulty filters or carburetor.

Checking the fuel filter

If the fuel filter is clogged with dirt, it is not able to pass enough fuel through it. As a result, the chainsaw stalls if you press the gas. The fuel burns too quickly, and a new portion of it does not have time to enter the system. If the fuel filter is slightly clogged, a significant reduction in power is observed at maximum engine speed.

Chainsaw fuel filter

Air filter

Contamination of this element makes normal operation of the chainsaw impossible. But many models are equipped with a special compensator, which takes air in a different way. It allows you to do this even with a dirty filter, which has a positive effect on the operational capabilities of the unit.

Location of the air filter and spark plug of the chainsaw

In such cases, the power of the saw drops significantly, but it will not stall. Sometimes a decrease in this characteristic is observed when the piston is worn out.

Carburetor

The principle of operation of a chainsaw carburetor

A common cause of malfunctions of such a tool is carburetor failure. It is recommended to check this element if you have certain skills. It is better to give the device to a specialist who will perform high-quality diagnostics and adjustments using a tachometer.

This is especially true when the saw stalls at idle. It is recommended to check the operation of the muffler. It is because of the accumulation of exhaust gases that the saw stalls at idle and does not work normally. It often happens that the saw is not used for a long time. When they start using it again, they notice that when starting at idle, the unit works well, but when you press the gas, it stalls. The main reason for this negative phenomenon is a stuck injector valve.

To check for the presence of such a malfunction, it is necessary to remove and disassemble the carburetor. To do this, you need to unscrew the two nuts where the air filter was fastened. It is removed together with the engine control lever. The choke control rod must be disconnected from the carburetor.

Removing the carburetor cover

At the next stage, you need to pull this part towards you slightly, disconnecting the fuel supply hose. This must be done especially carefully, having previously prepared a special plug. It will be useful for closing the hose, since fuel will be released from it.

When you have managed to remove the carburetor, you need to clean it of dirt and blow on it. Only then can you try to unwind this part. It is necessary to remove the main cover and use a small bolt to carefully knock out the valve. It should only allow air to flow in one direction. If it goes on both sides, then this part needs to be replaced.

Carburetor disassembled

Reasons why a chainsaw stalls under load

This article from the construction site remstroisovet.ru will discuss the main reasons why a chainsaw may not start or stall under load.

The most common reasons of all are the following:

— Blockage in the chainsaw carburetor - if the chainsaw carburetor is severely clogged, then the engine simply does not have enough fuel, and it begins to stall under load. Consideration of this problem will be described below, but for now we move on.

— The chainsaw carburetor sucks in air. This is also one of the common reasons why a chainsaw engine lacks power. It’s all about the gasket, or more precisely, its tightness.

— Problems with the chainsaw’s clutch can also lead to it starting to stall. It is very easy to damage, or in other words “break” the chainsaw’s clutch, and repairs will cost a pretty penny.

— Poor quality fuel mixture often causes chainsaw breakdowns. This is especially true for those moments when the chainsaw has not been used for a long time and gasoline has been poured into it. The old fuel mixture should be drained and a new one should be added, strictly maintaining the correct proportions of two-stroke oil for lubrication.

What causes a chainsaw to lose power?

— The power of the chainsaw is not enough. This, as it may seem at first glance, trivial option for considering the problem cannot be discarded. But if you are sawing an old dry acacia tree or a thick wet log with a chainsaw, then the engine simply may not have enough power. This is especially true in cases where the chainsaw chain is too dull and requires immediate sharpening.

— Incorrect adjustment of the chainsaw carburetor. If you have already adjusted the carburetor of a chainsaw, you might have done something wrong, as a result of which the chainsaw began to stall under load. It is better to re-adjust the chainsaw carburetor and repeat it several times on a “hot” engine and always during operation, so to speak, under “load”.

— The chainsaw fuel filter is clogged. The next problem due to which the chainsaw will certainly stall under load is a severely clogged fuel filter. Remember how long ago you changed the fuel filter on your chainsaw and did you change it at all? If it hasn't been changed for a long time, then you shouldn't even get into the carburetor, because it won't help at all. First replace the old fuel filter, and then, if the problem does not go away on its own, adjust the carburetor on the chainsaw.

The same applies to the air filter; if this kind of problem occurs, it must be cleaned immediately. Now about the spark plug, if it is very dirty, it is also cleaned and adjusted if necessary. It is the incorrect gap between the electrode of the spark plug on a chainsaw that can lead to it starting to stall, and in general, to work extremely unstable.

Reasons for stopping at full speed

Sometimes the chainsaw stalls at full speed. If it was working well and suddenly stopped doing so, and the starter does not turn, you can suspect that the device is jammed. In this case, you cannot do without a major overhaul.

When the saw worked well, but began to gradually lose power and then stall, you should suspect something completely different. In this case, overheating of the cylinder is observed, which is explained by air leakage under the rubber pipe or its rupture. To fix the problem, it is worth changing this element.

The device of the cylinder-piston group of a chainsaw

When opening the air damper

It happens that the unit stalls when the air damper is opened, idling normally. This is due to air leaks from the system caused by cracks in the fuel hose or problems with the seals. The carburetor metering system may also malfunction, and the lawn mower will stop after opening the damper.

Fuel hose in carburetor

All possible reasons why the lawn mower stalls and how to eliminate them are contained in the following video

There are many reasons why a lawn mower stops, but the most common are malfunctions associated with its carburetor . They can arise in any case. The most problematic option is when a serious breakdown occurs and you will need to purchase new parts or replace the lawn mower.

In order for the trimmer to work properly for a long time, you must strictly follow the operating instructions. It is necessary to refuel the unit with a fuel mixture suitable for its composition; the device must operate under moderate load.

Problems associated with improper operation of the fuel system

The tool stalls if the integrity of the fuel line is broken or the wrong fuel mixture ratio is selected. Especially often, such tube defects occur when the instrument is kept for a long time in a room where sudden temperature changes were observed. When refueling the device, you must strictly follow the manufacturer's recommendations regarding the ratio of gasoline and oil.

Proportions of oil and gasoline for a chainsaw

At idle

At idle, common reasons for the trimmer stopping are the following:

• contamination, misadjustment or incorrectly adjusted carburetor adjustment;
• air filter clogged;

Replacing the air filter of a brush cutter

Trimmer air filter

• reduction in gearbox speed when it heats up, which is a consequence of using an unsuitable fuel mixture;
• throttle valve clogged;

• air entering the system;
• There is not enough fuel to operate the trimmer.

If the problem area is the carburetor, then the equipment will stop both during a “cold” and “hot” start.

Cleaning and adjusting the carburetor

If all of the above does not help, then, most likely, the carburetor needs to be adjusted or cleaned. It is not recommended to do these procedures yourself, since most often such attempts still end in a trip to the service center. So it’s better to go there right away and not disassemble anything yourself. But if you still want to dig deeper yourself, then it’s best to watch a video that shows how experts do it:

I will end here. Thank you for your attention! Read other articles on this site! See you again!

Home page » Husqvarna 236 Stalls When Pressing Gas

Chainsaw Shtil stalls at high speeds

What to do if the chainsaw stalls at high speeds?

• When the engine is faulty Malfunction of the ignition system
• Fuel supply system is faulty
• The muffler has failed
• Damage to the cylinder pistons group
• Chain lubrication system malfunctions
• Chain brake failure

Even with a great desire, a chainsaw cannot be classified as a complex device. And let us also note: the simplicity of the design is its corresponding feature. However, despite this fact, even such a simple device breaks down, taking a considerable amount of time to repair.

The difficulty is not the repair procedure itself, but the correctness of damage determination. The same breakdown can be caused by completely different defects. Chainsaw Calm what gasoline for a chainsaw Calm what gasoline brand AI-92, because Q. Therefore, there is no need to rush to disassemble the engine or carburetor here until the signs of failure have been studied. The car stalls at idle: which is what a chainsaw can do at idle. A summary of how to operate and repair a chainsaw doesn't require much here; you'll have to use your brain more.

The available breakdown options can be classified into one of two categories: damage to the engine system with numerous groups and components in it (ignition, fuel supply, exhaust, cylinder-piston) and breakdown of other components (lubrication system, brake, tire, clutch, etc.).

Content

When the engine is faulty

Electric ignition circuit for a chainsaw.

It often happens that the normal performance of the motor in chainsaws is disrupted. It is the search and restoration of damaged engine systems that takes up the lion's share of users' time. Why does the chainsaw that the device stalls? The chainsaw does not work at high speeds. They may have the following manifestations:

• cannot start;
• the chainsaw stalls when it starts;
• job instability;
• It idles normally, but at high rpm it stalls.

When planning to repair a chainsaw on your own, purposefully apply the method of exceptions - one by one, check the possible causes of damage. They begin to inspect those that will take the least time to correct.

Ignition system malfunctions

Absolutely all of the indicated types of engine defects can be caused by malfunctions in the ignition system. If problems arise with a chainsaw, you should start finding the problem specifically with the spark plug. Which also has some other meaning: the condition of the spark plug will tell you about the operation of the fuel group as a whole. Having found any problem, you need to analyze the spark plug, turning it out first. Why do they disconnect the wire and use a special wrench to unscrew it?

The mechanism of operation of a chainsaw carburetor.

The dryness of the spark plug indicates that the source of the problem is not with the ignition system, but with the lack of fuel in the water cylinder. In this situation, the spark plug is screwed back in and the fuel group is analyzed.

If the spark plug is significantly contaminated with fuel, it is assumed that there is an excess of fuel. This phenomenon is associated with carburetor misalignment or non-compliance with starting requirements. In such a situation, the spark plug is cleaned and dried, the cylinder is released by closing the water supply and using a starter to ventilate the combustion chamber and get rid of excess water. Then the candle is returned back and the launch is created again.

The presence of abundant dark carbon deposits also only confirms the presence of problems in the fuel system.

Violations may occur in the proportions between gasoline and oil, in poor carburetor adjustment or in the addition of low quality oil. They wash the spark plug with gasoline, clean the carbon deposits with a needle or awl, clean the electrodes with fine sandpaper and put them back.

Also, in all situations, it makes sense to check the clearance between the spark plug electrodes. Chainsaw Shtil 180 stalls at idle. Find out the experts' answer for free! According to its vintage, it should correspond to a value from the spectrum of 0.5-0.65 mm. The sealing spark plug gasket also needs to be checked. If it is worn out or damaged, it will provide insufficient density for the combustion chamber. And this will cause a decrease in compression in the cylinder and problematic functioning of the engine.

READ Chainsaw Calm In Action. Stihl MS 180c

Diagram of a two-stroke chainsaw motor.

Even when checking the spark plug gives reason to believe that the damage is related to the fuel system, the spark plug is tested for spark formation. At least to eliminate suspicions that there are problems with this issue. Do:

• putting a cable on the spark plug;
• using insulated pliers, press the spark plug nut or thread onto the cylinder;
• press the starter handle and observe whether a spark appears or not.

When the spark does not appear, the spark plug is changed. If even when replacing the spark plug no spark appears, then the high-voltage condition is analyzed for breakage and contact with the spark plug.

A lack of spark can be caused by a malfunction of the ignition module or failure to maintain the gap between it and the magnetic wire of the flywheel. The latter should be equal to 0.2 mm. In particular, a violation of the gap becomes entirely possible if the other day you disassembled the saw and removed the flywheel with the ignition module. The chainsaw stalls at high speeds if the tool stalls at high speeds. The defective ignition module is replaced.

Having completed all the steps to check the ignition system and found no deviations, proceed to analyze the fuel supply system.

Fuel supply system is faulty

If, when examining the spark plug, it is determined that liquid is not supplied to the cylinder, then the possible reasons for this fact will be found out. They are:

• fuel is not supplied from the tank due to a clogged hole in the lid (breather), while a vacuum appears inside the tank, creating an obstacle to the exit of water;
• the fuel filter located in the tank is dirty;
• fuel fluid does not flow from the carburetor or does not flow in sufficient quantity into the cylinder.

Oil supply for chain lubrication.

In order to diagnose the first 2 circumstances, remove the fuel hose from the carburetor and observe whether fuel leaks out of it or not. When it flows out in a real stream, the filter and breather are not visible. Why does the Stil 180 stall when you press the gas or. If the flow is weak or not flowing at all, then the source of damage is considered to have been found. The breather is cleaned with a needle.

Calm 180. Classic of the genre. Doesn't develop speed

The video discusses a fairly common malfunction of chainsaws

and 100% carburetor option method. How did you do it?

Chainsaw stalls when pressing on gas

Chainsaw

It can work normally when in a straight horizontal position, but
stalls
when tilted sideways.

Using a wire hook, remove the fuel filter along with the absorption hose through the fill hole of the empty fuel tank. From the latter, the filter is removed and cleaned or replaced with a fresh one. Chainsaw manufacturers advise changing the fuel filter after each trimester.

A weak flow of water into the cylinder from the carburetor or non-compliance with the proportions between liquid and air is caused by several reasons:

• clogging of the air filter;
• unadjusted carburetor, clogging of its channels or filter mesh.

The usual procedure for repairing chainsaws is accompanied by cleaning the air filter, since it becomes dirty very quickly. When this happens, the flow of air into the carburetor is reduced, the fuel fluid at the outlet becomes very rich, which leads to interruptions in the normal functioning of the engine.

Removing a dirty filter for cleaning is done with great care so as not to shake off dirt into the carburetor. Why does the Shtil 180 chainsaw stall when you press the gas. Description of causes, troubleshooting methods. The filter is cleaned or washed with water and a cleaning agent, dried and returned to its place.

Centrifugal clutch of a chainsaw: 1 – friction linings, 2 – springs, 3 – drum.

By adjusting the carburetor, misalignment is eliminated. As usual, this is done using 3 screws - maximum and minimum rotation, idle speed. The adjustment is made, be sure to adhere to the descriptions in the annotation. Otherwise the engine will simply break. Other chainsaw manufacturers provide a single idle speed screw to eliminate unnecessary interference with the carburetor performance of inexperienced users.

READ What oil to dilute gasoline for a chainsaw

When carburetor adjustment turns out to be ineffective, clean the channels with the filter network and inspect the safety of the membrane here. The carburetor of a chainsaw is considered a capricious device, so you should disassemble and clean it, understanding the full responsibility of the operation.

The peculiarity of working with it is that a huge number of small parts of its components have the ability to inconspicuously jump out of their places and get lost forever. Once you disassemble such an unruly mechanism without thinking, you may not be able to put it back together in the same form.

If you have little or no experience in carburetor repair, then it is better not to tackle it without the help of others, but to entrust this important undertaking to a specialist from the service center. The carburetor is cleaned there from time to time using ultrasound.

The muffler has failed

Chainsaw fuel system: 1 – fuel filter, 2 – carburetor, 3 – manual preparatory pump.

Often the cause of engine failure, especially when the engine works well at low speeds, and at high speeds it heats up and the chainsaw stalls, is the clogging of the spark arrestor in the muffler with combustible products, creating obstacles to real exhaust.

Repair in a similar situation comes down to removing the muffler, disassembling it and moisturizing the cleaning of carbon deposits using detergents. After washing the non-removable muffler, dry it with a hairdryer. Since carbon deposits consist of carcinogenic particles, it is unacceptable to clean dry, as toxins will enter the master’s respiratory system. After removing the muffler, the exhaust hole is plugged with a cloth.

A prerequisite for clogging is the use of fuel fluid with excess oil (more than recommended by the manufacturer), low-quality oil or not intended for 2-stroke engines.

Damage to the cylinder pistons group

Damage to the cylinder-piston group (CPG) is considered more serious. This includes: wear of the cylinder and piston, scratches on their walls, wear or sinking of the piston rings in the grooves, wear of the crankshaft bearings. Many of these problems cause a decrease in pressure in the cylinder and the inability to start the engine or operate it at full capacity when the chainsaw heats up and stalls.

Air cleaning system: 1 – cover covering the fine filter, 2 – narrow filter, 3 – cover covering the coarse filter, 4 – coarse filter.

The condition of the CPG is assessed using one of several methods.

1. Removing the muffler allows you to examine part of the end surface of the cylinder in the opened hole. Although the visible area is small, it can still shed light on the state of the CPG.
2. Compression is determined, which is very informative about the condition of the CPG parts. The function is performed using a compression gauge placed in the spark plug hole.
3. Using a drill, a manual starter or a flexible shaft, rotate the crankshaft, immediately checking the pressure on the pressure gauge. For a saw with normal performance, it should be more than 8-9 atm (or 0.8-0.9 MPa). As it decreases, it leads to a decrease in engine performance. A pressure of 5 atm still means the engine is running, but at idle.

An accurate assessment of the condition of the CPG is only possible with complete disassembly of the engine: unlocking the crankcase from the cylinder and removing the piston. Answer: chainsaw calm 180. Repair and treatment of childhood diseases. Good day, anyone who has encountered help, I have the following kind of problem: I was driving calm 180, it stalls at idle, you give the gas. If burrs, chips or deep scratches are found on the latter, it is replaced. As for the cylinder, if there is damage on the surface or it is worn out, it is bored to the repair size. The chainsaw at calm speeds worked well, but at low speeds it stalled. Low compression can be caused by wear or coking of the piston ring. And the “calm” and the chainsaw stalls at idle at high speeds. A serviceable ring does not contain carbon deposits, is held freely in the piston groove, adjoining the surface of the cylinder from the inside quite tightly.

READ Metal Mounting Saw With Carbide Blade

Chain lubrication system malfunctions

Without exception, all instructions for repairing chainsaws contain references to damage to the chain lubrication system, which is quite common. This:

• the supply of lubricant to the chain is insufficient or not supplied at all;
• oil leakage.

Coarse air cleaning system: 1 – snow filter, 2 – mesh filter.

When the chain is dry, inspect and clean the channels supplying oil to the tire. Their clogging is not unique.

In case of significant (small quantities are considered normal) oil leaks, the connection of the tubes to the pump fitting is examined for tightness, which may fall off or crack. A change in the integrity of the oil line (drips are not taken into account) can cause a deficiency of chain lubrication. The chain is spinning at hello. I have a 180 Stihl chainsaw. At idle speed here. Air is sucked into the pump, which reduces its performance. Problems with density are corrected by changing the tubes or sealing them.

A significant problem with the lubricant group is cracks in the oil pump body. Then they change it.

Chain brake failure

This malfunction is caused by contamination of the area under the cover and the brake band with grease or sawdust. In the first situation, they clean the area under the cover, in the second, they replace the brake band.

Replacement of parts with short service life

Chainsaw starter structure: 1 – drum, 2 – cable, 3 – handle, 4 – frame.

Individual elements of chainsaws that wear out naturally after the stated period of operation have passed must be replaced. Violation of their functions is not considered damage. Elements that have a short depreciation period are the chain, main sprocket, tire, components of the anti-vibration group, etc.

If you do not promptly replace elements that have reached their expiration date, their excessive wear will have a bad effect on other components of the chainsaw. For example, untimely replacement of the tire and main sprocket will cause increased vibration, which, in turn, will damage the crankshaft bearings.

The sprocket has a depth limit of 0.5 mm for producing teeth. In fact, they often allow wear to a depth of 1 mm, without thinking that this will lead to excess load on the crankshaft bearings and immediate failure of the latter. The operation of 3-4 chains should be a reason to change the tire itself, because by this point its wear exceeds the acceptable characteristics.

In particular, chainsaw tires wear out a lot in the part where cutting is carried out more often than others. Almost always it is the bottom of the guide bar. To wear parts at once, when changing the chain, rotate the tire 180º along the horizontal axis.

Adjusting the oil pump: 1 – adjusting screw.

When installing a new chain, install a new main sprocket. Since the service life of the sprocket exceeds this parameter of the chain itself, 1 sprocket is used for alternate operation of 2 replaceable chains. Which chainsaw is better, Stil or Husqvarna, the answer to a common question. Comparative analysis of the most popular chainsaw models from these manufacturers. So both the sprocket and the chains reach their end at almost the same time.

When a new chain is installed on a sprocket that is no longer suitable for work, then the wear of the leading links of the chain occurs even faster. For economical operation of chainsaws, you should always combine the use of one guide bar with 2 chain sprockets and 4 saw chains.

If the chainsaw stalls when heating up, you should immediately find the cause of the problem.

But you need to take this matter seriously. Don’t forget the Stihl chainsaw stalls when you press the gas, the Stihl 180 chainsaw won’t start? If you don’t have enough experience in knowing how chainsaws work, it’s better to ask a specialist to do it. Happy renovation!

Source