Chainsaw oil pump repair

In order to prevent lubricant leaks, it is necessary to periodically carry out maintenance of the chainsaw oil pump. During work and upon completion, it is necessary to observe oil leaks and, if they are detected, immediately retighten the connection elements.

A chainsaw is an effective and simple tool in design, but with prolonged use it can malfunction. An important role when sawing wood is played by the chainsaw oil pump, which supplies lubricant to the cutting edges through a special hole. During operation, chain links are subject to thermal and mechanical stress. Thanks to the oil supplied by the pump, friction forces are significantly reduced and, as a result, the intervals between sharpening the chain or replacing it increase.

The forward movement forces the oil out through the same hole. It is easy to guess that according to this principle, the unit works only due to the tightness created by the rubber cuff. May not be indicated on the working diagram.

Oil pump malfunctions

Regardless of the manufacturer, any chainsaw model experiences problems with the lubrication system.
Chainsaw oil pump assembly

The nature of malfunctions in the lubrication system can be different, and therefore, before starting repairs, it is necessary to accurately determine the cause of the oil leak or its failure to reach the tire. If we exclude the possibility of mechanical damage, the following breakdowns of the lubrication system can be identified:

The connection between the line and the output channel of the chainsaw oil pump is not airtight;
Not a tight fit of parts in the plunger system;
Inconsistency between the parameters of the discharge chamber and the dimensions of the plunger;
Lack of tightness of the oil line with the inlet fitting of the oil pump.

It is quite easy to eliminate oil leaks from a chainsaw if it is not used for a long time. To do this, you will need several screwdrivers and locksmith keys.

Tools

In order to disassemble Partner 350 you will need several specific tools:

Clutch wrench (you can buy it or make it yourself from a socket of a suitable size).
Piston stopper.
Torx hex set.
Soft metal drift.

Special key for clutch

Punch

For ease of disassembly, Partner 350 will need tweezers and a medical clamp. As for ordinary tools, you need to have screwdrivers or a cordless drill with a set of attachments, and a hammer.

Preventative maintenance of chainsaws

Sharpening the saw is done independently using tools and a file or on a sharpening machine. It is produced when cutting edges are worn out or minor chips on the teeth.

Filters are changed periodically in accordance with the manufacturer's recommendations. Air, oil and fuel cells are subject to renewal.

Spark plugs are replaced after a certain time, guided by operating requirements.

Refueling. Different manufacturers and engine types determine the composition of the fuel mixture - a 2-stroke or 4-stroke gasoline engine is filled with gasoline with or without the addition of oil.

More complex work - repair of the piston group, gearbox, clutch, etc. - is carried out as events occur. Such work is usually carried out in specialized repair shops.

A properly configured chainsaw is the key to safe and highly productive work. Remember this!

Video on how to properly tension a chainsaw chain.

Video about adjusting the oil supply for chain lubrication.

Home page » Adjusting Oil on a Chainsaw

Repairing an oil pump on a chainsaw

Any owner is pleased with good technology, tested in practice and proven itself more than once. New technology always amazes and alarms with its features that surpass the properties of very old technology, which is still in use by many.

Some craftsmen always try to purchase equipment from well-known companies of a certain brand for their own business and persuade their friends and acquaintances to do so, others focus on cost and acquire only precious things for themselves, and the company does not interest them.

Where is the guarantee that no matter what equipment we purchase one hundred percent corresponds to the property certificate under which it is sold? Where is the durability promised by the manufacturer if we operate their equipment according to our criteria, and moreover, “feed” it with our fuel and according to our recipes?

Nowadays, there is a lot of equipment that can be sold at different prices at different retail outlets. No one will say where and who collected the lawn mower or chainsaw that you received. A recognizable brand, and assembly can be carried out in an adjacent garage using components, perhaps even using a makeshift method.

Many chainsaw owners have noticed an oil stain on the place where their chainsaw

. The oil under the saw does not immediately begin to leak. And if the assembly is poor, or rather, if the chainsaw is poorly assembled, an oil stain may appear immediately after refueling.

Except for mechanical damage to the oil tank and oil supply system, there are few circumstances for oil leakage.

The connection between the oil supply line and the inlet channel of the chainsaw oil pump is not tight and the tightness between the opening of the oil tank and the line is weak.
Technical compliance of the dimensions of the plunger and the discharge chamber of the oil pump.
Not a tight connection of the supply line with the output channel of the oil pump to the place where the saw chain is lubricated.
Violation of the density of the plunger chamber of the oil pump.

I will dwell on the last option in more detail, because specifically in the case of loss of density of the plunger chamber, oil leaks, and in saw designs where the oil tank is located at a level higher than the oil pump, oil leaks out within a couple of days of the chainsaw being idle.

Remove oil leakage from the chainsaw oil pump

it is possible and all this happens quickly if someone has a good screwdriver and wrenches. If your chainsaw has had a short working life, then the problem can be easily solved.

As I mentioned earlier, the guarantee of trouble-free operation of your chainsaw is ensured not only by observing good operating conditions for it and implementing the manufacturer’s recommendations, it is also ensured by the appropriate quality of the components, and most of all, by the highest quality assembly.

A similar plunger-type oil pump, installed on most models of economical chainsaws, is simple in design. The principle of its operation does not differ from the operation of some plunger oil pumps of other categories of chainsaws.

I will briefly outline in my own words the mechanism of operation of a plunger-type oil pump of similar models, so that it would be a little clearer when familiarizing yourself with my method of correcting oil leaks through the oil pump of a chainsaw.

Diagnostics

Diagnostics should begin with inspecting and checking the oil receiver (filter) of the Stihl 180 saw. Typically, if the filter is very dirty, the oil supply may run out.

Next, you need to remove the drum sprocket and check the condition of the drive gear.

The thread on it must be correctly expressed, not licked and not have any other flaws; also, with the gear removed, you need to check the wire lever.

It must press the gear tightly and not turn; otherwise, the gear stands still and does not transmit force to the pump, as a result of which the oil supply stops.

If all the methods listed above to find and remove faults do not produce results, you need to use the last measures, i.e. dismantle the pump.

Oil pump - where is it located?

To repair the oil pump, you will need a set of screwdrivers, rags and wrenches.

First you need to remove the chain and unscrew the bolts that secure the guide chain to the saw body. Removing and replacing the blade on a circular saw; How to remove the disk and change the old circle to.

After which the pump itself is removed. Its placement is indicated by an arrow in the image below.

Chainsaw fuel system design

The fuel system of a chainsaw is not only a gas tank into which a freshly prepared mixture consisting of gasoline and special oil is poured. The fuel system includes the following elements:

Gas tank, the volume of which is up to half a liter
Fuel filter located directly inside the gas tank
The fuel line or hose through which the gasoline-oil mixture enters the carburetor
Fuel tank cap with breather. Few people know what a breather is, but it is an important part in the design of a gas-powered tool, which is responsible for balancing the pressure inside the tank

The more powerful the chainsaw engine, the larger the volume of the gas tank. However, too large a tank volume increases the weight of the tool, so chainsaws with a tank volume exceeding 0.6-0.8 liters are not produced. On average, a full tank is enough to work with the tool for up to 50 minutes. This is an average value, since everything depends not only on the engine power, but also on the size of the logs being cut. The longer the chainsaw is operated under maximum load, the more often it will need to be refueled.

What is a breather on a chainsaw, and what device does it have? A breather is a pressure equalizer or check valve that prevents the creation of a vacuum inside the gas tank. A vacuum or depression in the tank is created when the amount of fuel decreases. A breather is a valve that allows air to flow in only one direction. This valve also prevents gasoline from leaking out of the tank. This valve is used in the design of a saw’s gas tank with a diaphragm carburetor. The vacuum created in the design of the gas tank is an obstacle to pumping the gasoline-oil mixture, so the presence and serviceability of a breather is mandatory.

The breather can be located in the design of the gas tank cap (in the form of a small hole) or in the structure of the tank itself. You can find out where the breather is on a chainsaw yourself by examining the tool’s container. If the breather hole becomes clogged, this will make it impossible to start the chainsaw engine. To correct the situation, you need to clean the chainsaw breather hole.

The tank contains a fuel filter, the purpose of which is known to everyone. It is presented in the form of a cylindrical barrel connected to a fuel hose. Passing through the filter, the fuel enters the hose and is directed to the carburetor.

To quickly start a chainsaw engine, manual choke or pre-priming primers are installed in the design of the fuel system of certain manufacturers. This element allows you to manually pump fuel into the carburetor, thereby speeding up engine starting. If there is no primer on the chainsaw, then fuel is pumped into the carburetor by pulling the starter handle.

After stopping the engine, fuel flows from the tube back into the tank. Knowing the design and operating principle of the chainsaw fuel system, it will not be possible to identify breakdowns and then repair them yourself.

Device

The general arrangement is made in a traditional style. It is distinguished by its simplicity, which means high reliability of the unit.

Partner 350 chainsaw device

The diagram of the general structure of the Partner 350 chainsaw clearly confirms this.

Starting the engine is simple and reliable. This was made possible thanks to the presence of electronic ignition. pump) plays a major role during startup.

READ How to adjust a Chinese-made chainsaw

The air filter is equipped with a double air purification system. As a result of equipping the starter drum with an impeller, large debris particles do not reach the filter at all. Thanks to this, its service life increases, and the degree of air purification increases. In general, this has a beneficial effect on engine performance.

Safe handling of a running saw is achieved by the presence of a chain brake operating in two modes - manual and automatic.

Oil pump

turns on only while sawing. This means that the chain lubrication system operates automatically. It must be borne in mind that different types of oils are used to lubricate the chain and prepare the working mixture. The video will help you find out what oil is used for the Partner 350 chainsaw

Saw chains. The Partner 350 saw is equipped with an Oregon 91P052E 3/8″ 1.3 mm 52 link chain. Replacement is acceptable

analogues: Stihl 39970000052с and others. For example, Husqvarna 5776151-22. Pay attention to the fact that with a chain pitch of 3/8″ and a groove width of 1.3 mm, the number of links does not exceed 52. Less (46 – 50) is possible, more is not advisable.

The anti-vibration system on the Partner 350 is somewhat harsh. Considering that this saw is not intended for professional use, the system as a whole can be considered satisfactory. By the way, significant improvements have been made in this regard on subsequent models.

Recommended components, parts, mechanisms and fuels and lubricants cannot be replaced with analogues.

Oil pump for a chainsaw: faults and repairs

As we said earlier, the operating principle of the chain lubrication system is the same for gas and electric saws. Therefore, it is clear that malfunctions associated with the oil pump, as well as the causes that cause them, will be the same. A malfunction of the chainsaw oil pump can manifest itself in only two ways - the oil is supplied in insufficient quantities or it leaks out where it is not needed. Let’s take a closer look at the symptoms of a malfunctioning oil pump for a chainsaw and talk about the possible causes of their occurrence. At the same time, we will mention ways to solve problems.

Insufficient oil supply to the chain. Insufficient lubrication leads to overheating and chain stretching. This can lead to jamming and, more dangerously, the chain jumping off while the saw is running. There may be several reasons why the pump does not supply the required amount of oil.

The simplest and most easily eliminated reason is clogged channels through which oil is supplied to the chain. Sawdust and other debris clog them and prevent the chain from being properly lubricated.

Therefore, it is important to promptly clean the output channel and the channels on the tire where the oil passes. Another reason is a malfunction of the chainsaw oil pump plunger. The rotating plunger captures a certain amount of oil and sends it to the chain

The rotational speed of the plunger directly depends on the number of engine revolutions, that is, the faster the chain rotates, the more oil should flow to it. A failed plunger must be replaced.

Oil leakage. You must understand that a slight oil leak is acceptable. However, if you find your chainsaw in a puddle of oil every time, it's time for a repair.

First of all, check the tightness of the oil pump tubes and fittings. Over time, the tubes may crack. In this case, it is best to replace them with new ones, but you can try sealing them with a special sealing material.
If the cause of the malfunction is a crack in the body, you will have to buy an oil pump for the chainsaw - such defects cannot be repaired.

Incorrect operation of the oil pump for a chainsaw cannot be ignored. However, there may be several options for solving the problem. Correct diagnosis and determination of the cause of the malfunction is a guarantee of a speedy solution to the problem.

Prevention measures

In order to prevent lubricant leaks, it is necessary to periodically carry out maintenance of the chainsaw oil pump. During work and upon completion, it is necessary to observe oil leaks and, if they are detected, immediately retighten the connection elements.

Compressor for cleaning channels

Before starting work, it is necessary to check the level of lubricant in the tank. It is best to use the chain oil recommended by the manufacturer. Under no circumstances should mining be poured due to its heterogeneous structure and the presence of metallic inclusions.

To prevent the formation of vacuum blockages in the lubrication system, it is necessary to periodically blow out the oil pump channels with compressed air. Upon completion of sawing work, it is necessary to clean the unit from residual sawdust and dirt. At the beginning of the season, in order to ensure that the lubricating fluid spreads evenly through the channels of the chainsaw, it must be suspended in a vertical position in working condition for several minutes.

How to adjust

The pump operating parameters are changed by adjusting the plunger stroke. To do this, a special screw is used, which turns an eccentric that limits the mobility of the rod. On the body of the saw there are arrows and the inscriptions Min and Max, explaining the principle of operation of the element.

Repairing an oil pump on a chainsaw

READ How to Use a Circular Saw

Many chainsaw owners have noticed an oil stain on the place where their chainsaw

. The oil under the saw does not immediately begin to leak. And if the assembly is poor, or rather, if the chainsaw is poorly assembled, an oil stain may appear immediately after refueling.

Except for mechanical damage to the oil tank and oil supply system, there are few circumstances for oil leakage.

The connection between the oil supply line and the inlet channel of the chainsaw oil pump is not tight and the tightness between the opening of the oil tank and the line is weak.
Technical compliance of the dimensions of the plunger and the discharge chamber of the oil pump.
Not a tight connection of the supply line with the output channel of the oil pump to the place where the saw chain is lubricated.
Violation of the density of the plunger chamber of the oil pump.

Remove oil leakage from the chainsaw oil pump

it is possible and all this happens quickly if someone has a good screwdriver and wrenches. If Vaschainsaw has had a short working life, then the problem is easily solved. As I mentioned earlier, the guarantee of trouble-free operation of your chainsaw is ensured not only by observing good operating conditions for it and implementing the manufacturer’s recommendations, it is also ensured by the appropriate quality of the components, and most of all, by the highest quality assembly.

Diagnostics

Diagnostics should begin with inspecting and checking the oil receiver (filter) of the Stihl 180 saw. Typically, if the filter is very dirty, the oil supply may run out.

Next, you need to remove the drum sprocket and check the condition of the drive gear.

The thread on it must be correctly expressed, not licked and not have any other flaws; also, with the gear removed, you need to check the wire lever.

It must press the gear tightly and not turn; otherwise, the gear stands still and does not transmit force to the pump, as a result of which the oil supply stops.

If all the methods listed above to find and remove faults do not produce results, you need to use the last measures, i.e. dismantle the pump.

Oil pump - where is it located?

To repair the oil pump, you will need a set of screwdrivers, rags and wrenches.

After which the pump itself is removed. Its placement is indicated by an arrow in the image below.

How does an oil pump work?

The oil supply pump is located on the crankcase, on the same side as the drive - directly behind the drive sprocket. To understand how it works, you need to look at the pictures and see what parts it consists of and what moves where.

So, this is what the oil pump looks like (it may look different for different models, but the principle is the same).

And here is his working diagram.

It all works like this.

From the drive, through a worm gear, rotation is transmitted to the plunger, which, while rotating, makes a longitudinal reciprocating movement. This back and forth movement is ensured by the shape of the plunger, an adjusting screw with an eccentric and a thrust spring. When the plunger moves back, oil is sucked into the oil chamber through the inlet due to the vacuum created (similar to a syringe). When moving forward, oil is pushed out through the outlet of the oil chamber. To ensure tightness, a rubber cuff is used (it is not shown in the diagram).

To prevent both holes from being open at the same time, there is a segment cutout at the end of the plunger. When moving backwards, it is turned towards the inlet, while the outlet is closed. When moving forward, the inlet closes and the outlet opens, as the segment cutout rotates towards the outlet. Thus, for one revolution the plunger makes one reciprocating movement.

To reduce or increase the stroke of the plunger, an adjusting screw with an eccentric is used. The eccentric in this case is a cylinder built into the body of the adjusting screw. Moreover, the central axis of this cylinder does not coincide with the axis of rotation of the screw, therefore, if the screw is rotated, the cylinder either approaches the end of the plunger or moves away from it. Actually, this is the essence of the eccentric. Because of this offset from the center, it is often called a cam.

When approaching it as close as possible, the plunger will not move and the oil will not pump. At maximum distance, on the contrary, the plunger will have maximum stroke, which means it will pump oil to the maximum.

How does the plunger move back and forth? It's simple. Its end is processed in such a way that it has a central protrusion in the middle, which rests against the eccentric, and the edge of the end is made in the form of a ring around this central protrusion. In this case, the ring is not perpendicular to the longitudinal axis of the plunger, but is located at a certain angle, forming a bevel - one part sticks out a little. The adjusting screw and the end of the plunger are aligned so that the edge of the end, when rotated, comes into contact with the screw either with the protruding part or with the non-protruding part. When it comes into contact with the protruding one, the plunger moves forward. When not protruding - back. In this case, the plunger moves backward due to the thrust spring.

Malfunctions and methods for their elimination

Problems with the oil pump can be divided into two categories. The first is a complete lack of oil supply, the second is leakage. Depending on the type of problem and the main “symptom” you need to act differently.

No oil supply

If oil is not supplied to the saw set, but you do not notice any leaks, you can assume that the plunger remains motionless. Why is the plunger standing still? It may be worn out or the screw it is connected to is not installed correctly. The latter may stand in an unnatural position, which often happens due to improper assembly of this unit.

You need to focus on +/-, special marks. Such marks, of course, can be lined up in the correct position, but the screw will not be in the correct position (opposite). How to fix this problem? Simply disassemble the pump and install the screw as required. Sometimes it is enough to turn it to the “-“ mark. The screw cannot go into place by itself, so it blocks the movement of the plunger.

How can you tell if the plunger is worn out? Pay attention to its end, or more precisely to the edge of this end, which can wear off. Then you won’t see the characteristic protruding part in this place

This place with the entire edge will be approximately at the same level. How to solve this problem? There are two options:

replacing the plunger;
grinding the edge of the end, which will allow you to form the desired shape.

If you choose the second option, be sure to grind the lip down the center. Please note that the pump will work after turning, but the oil volume will be increased due to the displacement of the plunger.

Sometimes another problem happens when oil leaks out, but the pump does not work as it should. Then you need to check the inlet and outlet hoses. Some of them may become disconnected. If this happened to the input, then the oil will flow even when the saw is not running. If the outlet hose is disconnected, then oil will flow when it is started. It is easy to fix this problem; just reconnect the hoses.

Leak

It would seem that we have examined the cause of the oil leak. Yes, indeed, this sometimes happens due to disconnected hoses. But this has nothing to do with the pump itself. So now let’s look at the causes of leaks that are associated with pump malfunctions.

A leak can occur when the rubber seal no longer provides a tight seal. The seal may be very worn, or it may not be installed correctly.

Before looking for a new pump for your Partner chainsaw due to constant leaks, dismantle the components and look at the cuff, which can be installed with a collar facing the oil reservoir. If it's standing like this, turn it about 180 degrees. If you see that the seal is worn out, replace it with a new one. Of course, try to find the perfect cuff. If you can't find it, buy a sealing ring from a plumbing supply store.

If you still see leaks after this, check the pump cylinder walls for signs of wear. In this case, it is easier to buy a new pump.

What oils can be used

Leading manufacturers of chainsaws recommend using their own lubricants in their equipment. However, these oils often cost several times more than simpler ones from third-party manufacturers.

Please note: If you are in doubt about the choice of lubricant, then in this case, the best solution would be to purchase lubricants from the equipment manufacturer.

But what to do if for some reason it is impossible to buy expensive original oil? Here, chainsaw owners resort to different options. Let's take a general look at each of the possible lubricants for saw chains.

Original oils

Often this is the best choice in terms of performance, but not price. In addition to optimal lubricating properties, today manufacturers strive to make these lubricants biodegradable (based on rapeseed bases), which has almost no harm to the environment and human health.

Stihl chainsaw chain oil is a biodegradable product. The only significant negative is the price.

Narrow profile

Special oils for chainsaw chains from third-party manufacturers. Also a good choice. They cost significantly less than branded lubricants, but are often almost as good in performance.

Cheap industrial oil

The most common option here is the domestic product, labeled I-20 or I-20A. One of the cheapest options. This industrial oil can be poured into a chainsaw to lubricate the chain without fear of negative consequences.

The lubricant has good properties regarding the operating conditions of the saw set and can reliably protect the chain and other elements of the set from wear.

In terms of performance, it is a little inferior to the original. But the price can be several times lower than for specialized products. Therefore, this option is used by many owners of chainsaws of all brands and models.

In hot conditions, it is recommended to monitor the lubricant level during sawing after half the gas tank has been used up.

Due to its very low viscosity, industrial oil is consumed quite quickly. There are known cases where industrial lubricants were used up faster than the fuel tank ran out.

New engine or transmission lubricants

Not a very reasonable choice in economic terms. Suitable for cases where the saw is rarely used, and there is no point in buying a canister of special lubricant separately.

These oils contain a huge amount of unnecessary and useless additives for saw operation, which will only pollute the processed lumber and the environment.

Which oil is better to use for a chain - video

Here you also need to take into account viscosity indicators. The rate of oil supply to the chainsaw chain can be greatly reduced as the temperature increases the viscosity.

Greases may lose their fluidity in winter conditions and may not effectively protect the chain and tire running surfaces from wear.

In the case of motor oils, when working in winter, it is recommended to use low-viscosity options. In general, internal combustion engine lubricants can be used in saws.

Used oils

Using used oils to lubricate a chainsaw chain is the worst idea possible.

Firstly, the specific nature of the operation of a chainsaw implies the creation of an oil mist in the work area, which spreads to the surrounding nature and is partially inhaled by humans.

And the waste is a recognized carcinogen and is generally extremely toxic. Therefore, in many countries, entire industries have been created to recycle used motor and transmission oils, and unauthorized discharge into the environment is punishable by serious fines.

Secondly, the lubricating qualities of the waste are extremely low. They are tight enough for medium load conditions. If you cut a thick log or hardwood, the chain and the rest of the saw set will suffer, even to the point of irreversible destruction.

Answering the question of how to replace chain oil for a chainsaw if it is too expensive to buy the original, you can answer this way: almost any oil with a suitable viscosity. But not with detention. It is better to fill the chainsaw with products specially designed for this purpose to lubricate the chain.

How and when to pour lubricant into the reservoir? Here the answer is simple: pour gas every time you fill up to the mark on the neck.

Replacing the sprocket

The most common cause of a malfunction in this element is jamming of the chain due to its misalignment or significant wear of the chainsaw sprocket itself.

If any signs of these deviations appear, it is necessary to carefully inspect the plane and teeth of the drive transmission element, paying attention to the depth of drift (it should not exceed 0.5 mm)

If severe wear or traces of deformation are detected on the sprocket body, it can sometimes be repaired, but if the malfunction is serious, a complete replacement is required. Regardless of the nature of the damage found, before repairs you will first need to remove the sprocket from the chainsaw, that is, completely free it from all retaining fasteners.

Most chainsaws have a similar clutch layout. For disassembly, you should use a spark plug wrench, which usually comes with the chainsaw, a clutch remover and a piston stopper.

First, unscrew and remove the tire and remove the chain. Remove the top cover to gain access to the spark plug, unscrew it and install the piston stopper. Often a rope or cord is used as a stopper, but experts do not advise doing this. It is better to use a special stopper when removing the clutch. Remove the side cover, unscrew the clutch (clockwise!) and get to the sprocket.

In another option, the starter is unscrewed and the protection is removed in order to hold the unit that is spinning on the reverse side. The procedure for completely dismantling the main parts of the chainsaw is well presented in the video

All removed parts must be put in one place so that they do not get lost. You can take photos of the chainsaw components so that later after repair you can quickly assemble the tool in the reverse order.

Assembly Partner 350

In order to correctly assemble Partner 350, it is necessary to install all elements in the reverse order of removal.

If this is your first time repairing a Partner 350 chainsaw, then when disassembling, place the parts in the order in which they were removed. This will prevent you from getting confused and forgetting to install any node.

An important feature of the Partner 350 chainsaw engine assembly is that the crankcase cover is installed without a gasket. Instead, a red sealant is used, which is applied in a thin layer to the crankcase installation site. Before applying the sealant, it is necessary to degrease the crankcase cover and its installation location for better adhesion of the sealant.

Setting the flywheel and coil clearance (ignition adjustment)

During the assembly process of the Partner 350 chainsaw, if not only the flywheel, but also the ignition coil was removed, a gap must be set between them. To do this, first install the flywheel, then place a piece of a one and a half liter plastic bottle on it, and then place the coil and fix it with two fastening screws, while the flywheel must be turned toward the coil with magnetic contacts.

After adjusting the clearance, rotate the flywheel. If it does not touch the coil contacts, then the gap is set correctly.

Disassembling and cleaning the muffler

If the engine runs great at low speeds, but starts to stall at high speeds, the reason may lie in the muffler spark arrester, which is clogged with combustion products.

remove the muffler;
disassemble (there are also non-dismountable models);
remove carbon deposits using detergents;
dry with a hairdryer;
install in place.

Dry cleaning is unacceptable, as carbon deposits contain carcinogens, the inhalation of which is hazardous to health. After removing the muffler, cover the exhaust hole with a clean rag.

Interruptions in the operation of the chainsaw indicate a possible clogging of the muffler

To prevent clogging of the muffler, it is necessary to monitor the composition of the fuel mixture. The amount of oil should not exceed the standards recommended by the manufacturer. Poor oil quality also negatively affects engine performance.

Carburetor repair and adjustment

Carburetor adjustment is carried out on a warm engine. If the engine cannot be tuned, then the cause of excess gasoline in the mixture may be a stuck carburetor. To remove the part, you need to unscrew the fastening nuts, disconnect the ignition and linkage from the engine control lever. Then remove the lever. You can then remove the filter and carburetor.

The muffler is secured with two nuts. You need to unscrew them and pull the muffler towards you. Then unscrew the screws of the coil and dismantle it. The Stihl saw has a carburetor with 1 idle adjustment screw. If the idle speed is abnormal, the carburetor needs to be repaired. This is a complex process and difficult to do on your own. You should contact a repair shop.

Problems with the fuel supply channel

Lack of normal fuel supply to the combustion zone is possible for a number of reasons, including clogging and carburetor imbalance (or problems with throttle control).

To accurately identify this malfunction, it is necessary to disconnect the supply hose from the fitting and check the fuel pressure. If the stream flowing out of it turns out to be weak, there is a high probability that the filter located in the neck of the filler tank is clogged. If contamination is visible to the eye, it should be removed and cleaned (if the filter element is severely worn, it is recommended to replace it with a new one).

The breather is checked in the same way, and if contamination is detected, it is cleaned with a needle. In case of violations in the carburetor adjustment, it is repeated again until a positive result is obtained. When examining the throttle valve cable and lever, make sure that they are intact and in their proper place.

Clutch

At low speeds, elements with friction linings (1), having a degree of freedom in the circular direction, are attracted to the center of the shaft by springs (2) and do not transmit rotation to the drum (3), connected to the sprocket driving the chain. When the chainsaw engine speed reaches values at which the centrifugal force exceeds the force of the springs, the friction segments are pressed against the inner surface of the drum and begin to rotate it. As a result, the drive sprocket begins to rotate, driving the saw chain.

As you can see in the photo, the sprocket is located behind the clutch.

On other chainsaws, the sprocket may be located on the outside of the clutch.

The main advantage of this type of coupling is that when the chain jams, the chainsaw clutch slips without stopping the engine or causing damage to the devices that transmit movement from the motor to the chain.

Fuel system

So that as the fuel mixture is used up, the fuel tank is filled with air and negative pressure is not created in it, which will prevent fuel from flowing from it into the carburetor, and at the same time, so that fuel does not flow out of the air hole, in the cap covering the filler hole, breather made. And by the way, if the breather becomes clogged with dirt, the chainsaw will stall.

Fuel is pumped from the tank through a hose that dangles freely in the tank. Thanks to this, regardless of the position of the chainsaw, the hose is always immersed in fuel. A fuel filter is attached to the inlet end of the hose. Fuel is pumped by a pump inside the carburetor.

To make starting easier, some chainsaws are equipped with a manual preparatory pump - a primer. When starting a chainsaw with a primer, the carburetor is filled with fuel in advance (excess fuel flows back into the tank). Thanks to this, the engine starts faster, because The stage of filling the carburetor with fuel has already been completed, which without a primer is carried out by the carburetor pump at the expense of the starter.

Where is the breather located

The Partner 350 chainsaw, like other chainsaws, has two breathers. One is responsible for equalizing the pressure in the oil tank, the second - in the fuel tank. The oil tank breather is installed next to its cover, and a special disposable metal plug is installed on top of the breather to allow air to pass through.

The fuel tank breather Partner 350 is located in the area where the carburetor is installed, like the previous one, it is closed with a plug.

Tip: Breathers must be replaced when a vacuum is created in the tanks and the supply of fuel and oil stops.

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Signs of a malfunctioning lubrication system

The correct choice of consumable lubricant and flawless operation of the system contribute to complete lubrication, effective cooling of sawing equipment and the complete exhaustion of its service life.

There are several external signs that the chain on a chainsaw is not lubricated. First of all, this:

constant oil level in the tank;
increased load on the engine;
accelerated wear of the cutting edges of saw links;
characteristic smell of overheated wood.

In the simplest version, the cause of oil starvation may be clogging of the oil channels with sawdust. This drawback is typical for budget headsets that do not have convenient access to problem areas.

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