How to Disassemble the Oil Pump on a Chainsaw

Design and principle of chain saw oil pump

Not many sawyers know how to remove the clutch on the chainsaw. The design of mechanisms on different models of chainsaws differs, but the principle of operation is the same everywhere. The disassembly procedure is also almost identical, so next we’ll look at how to unscrew the clutch on a chainsaw with an internal sprocket.

Initially you will need to prepare the necessary tools:

  • A special wrench called a puller. It often comes with the chainsaw
  • Screwdriver for removing the screws that hold the guard in place
  • Spigot wrench. used to unscrew the shroud and tire mounts (supplied with tool)
  • A rope to secure the crankshaft. It is best to use asbestos rope, but any rope will do. Rope is used if you don’t have a special piston lock wrench with the tool

If the disassembly is carried out for the purpose of replacement, the new mechanism must be prepared in advance. When buying a new coupling, you only need to know the exact brand of chain saw, as the devices differ in external diameter, threads and construction of the working mechanism. Instructions on how to remove the clutch clutch on a chainsaw is as follows:

  • Initially it is necessary to unscrew the fastening nuts of the cover and the bar
  • Remove the handbrake cover and the chain and guide bar
  • After that, proceed to the removal of the plastic cover to get to the spark plug. To do this, unscrew the fasteners with a screwdriver, and remove the cover together with the air filter
  • Unscrew the spark plug of the chainsaw with a spark plug wrench
  • In the spark plug hole in the cylinder to slip a rope (install a special key, if available). This is done in order to secure the crankshaft. If the diameter of the rope is several times smaller than the size of the spark plug hole, you can make knots on it
  • Next proceed to unscrew the clutch itself. To do this, take a special wrench, which should be in the kit. If you do not have a key, you can use a tool from the angle grinder or make your own puller, which is also not difficult
  • The slits of the wrench must be installed in the holes of the coupling, and then proceed to rotate the part. Rotate in clockwise direction. Usually manufacturers indicate directions for unscrewing in the form of an arrow
  • When rotating the clutch, the piston will reach the top dead center, after which it will lock the crankshaft. Then, by applying a small amount of force, the clutch will unscrew and then unscrew the mechanism
  • The unscrewed clutch is removed from the chainsaw. If necessary, the drum with the sprocket is also removed

The procedure is not difficult at all and does not take much time. Reassemble in the reverse order of removal. In order to avoid any malfunctions, it is recommended to install a completely identical clutch on the corresponding model of tool.

This is interesting! The procedure for removing and replacing the clutch is the same for all brands of chain saws Husqvarna, Partner and others.

This is interesting: Design and characteristics of the Solo 681 chainsaw (Solo) made in Germany

How to Repair a Chainsaw with Your Own Hands: How to Remove and Replace a Sprocket, Repair an Oil Pump, Repair an Ignition System

Any drive mechanism, including a chainsaw, can fail over a long period of use. You should never be in a hurry to give a broken machine to a repair shop, because chainsaw repair can be too expensive.

If the user has at least some understanding of the structure of the gasoline saw and constantly works with it, he is quite able to fix not very complicated faults on his own.

To repair a chainsaw with their own hands will require at least to find suitable replacement parts and a little patience.

Types of breakdowns

Most chain saw breaks down because of wear and tear on the moving parts or because of reasons that have to be dealt with on the spot. Before proceeding with the repair, it is important to properly diagnose the causes of the resulting malfunctions, which can be categorized into the following groups:

  • Failure of the weakest link in the construction (this may be the engine or the chainsaw clutch);
  • damage to a number of ancillary components (brake or chain lubrication system);
  • Unintentional failure or deformation of some parts of the chain saw (handle, bar or sprocket).

Depending on which group the detected failure will be referred to, an appropriate approach to repairing the damaged mechanism is chosen.

The malfunctioning of the engine can have several causes, among which are failure of chain saw electronic ignition circuit components and malfunctions in the fuel supply system components. Repair may also be necessary if the chain saw’s piston assembly is malfunctioning.

Sprocket replacement

The most common cause of malfunction in this element is the chain jamming due to chain warping or significant wear of the chainsaw sprocket itself. If there are any signs of these deviations, 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 heavy wear or deformation is found on the sprocket housing, it can sometimes be repaired, but serious damage can require a complete replacement. Regardless of the nature of the damage detected, before repairing it will first be necessary to remove the sprocket from the chainsaw, that is, completely free it from all retaining fasteners.

Note! To get access to the sprocket, you have to disassemble the entire drive train, including the air filter, clutch basket, and more.

Most chainsaws have the same clutch. To disassemble it, use the spark plug wrench that usually comes with the chainsaw, a clutch puller, and a piston stopper.

First unscrew and remove the tire, remove the chain. Remove the top cover to gain access to the spark plug, unscrew it and install the piston stop. Often a rope or string is used for the stopper, but experts advise against this. It is better to use a special stopper when removing the clutch. Remove the side cover, unscrew the clutch clutch (clockwise!) and get to the sprocket.

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The other way is to unscrew the starter motor and remove the safety guard to hold the unit from the back, which is screwed through. The order of the complete disassembly of the main parts of the chainsaw is well presented in the video

All parts should be kept in one place so that you don’t lose them. You can take pictures of chainsaw assemblies, so that later, after repair, you can quickly assemble the tool in reverse order.

Repair of the ignition system

The main cause of failures in the main working unit (in the engine) is a malfunction in its ignition system. First of all in this case it is necessary to inspect the spark plug, to access which the high-voltage wire is first removed from its head and then it is unscrewed with a special tool.

Wet contacts

Moisture on the spark plug pins means that a lot of fuel is getting into the cylinder. This is most often caused by problems in the ignition system or improper adjustment of the chainsaw’s carburetor.

When you eliminate this problem you first remove any wet deposits from the contacts (use a dry cloth or wipe to do this) and then dry them well. To remove unburned gasoline residue from the cylinder, the inside of the cylinder should also be thoroughly cleaned and dried.

There is another way to get rid of residual fuel: first, turn off the gasoline, and then crank the starter several times.

After all these operations the plug is put back in its place, then the fuel cock is opened and an attempt is made to restart the saw.

disassemble, pump, chainsaw

Soot on the contacts

If black soot has accumulated in the gap in the spark plug contacts, you can conclude about a malfunction in the fuel supply, namely. an imbalance between the components of the mixture or bad oil. To eliminate the causes of carbon deposits in the first case, you should carefully adjust the carburetor and in the second. change the oil with a more suitable.

After that you need to remove the deposits of carbon on the contacts with an awl or any other sharp tool, and then sand them with a fine sandpaper (preferably “nullivka”).

If the chainsaw still fails to start, make sure that there is a spark between its pins.

Missing spark

To check the spark plug for the presence of the spark is required with the distributor cap on its head to bring the base skirt to the cylinder housing to a distance of about 2-3 mm, and then pull the starter handle. If at the same time a blue spark appears between the contacts, you can say that there is nothing wrong with it.

If the spark begins to strike only at a distance of 0.5-1.0 mm from the body, you should look for faults in the ignition system itself. If it is completely absent, first of all use a tester or a probe to check the high-voltage cable (to see if it is broken). If the wiretap showed no irregularities, it will be necessary to check the distribution mechanism and the engine ignition coil.

Oil Adjustment in a Chainsaw

Regardless of chainsaw type and frequency of its use it is required to take care of it and its parts, if not taken care of it then chain saw will be in a good state of deterioration. Lubricating your chainsaw chain, sharpening the teeth, priming the saw, checking the nuts and plugs is the key to long and proper operation of your tool.

In the course of long-term chain-saw operation its chain can get blunt, and cutting will be considerably complicated. That’s why it is necessary to periodically sharpen and lubricate the chain on chainsaws. Lubrication of the chainsaw chain is done with a special oil (although auto is also used). After the working version of the fuel consistency, it is essential that a small amount of oil in the chain is left. Oregon chains for chainsaws separately. these chains are very durable. These chains achieve long service life with a function such as automatic lubrication. That’s the reason why Oregon chainsaws last a long time and work flawlessly.

Checking the tightening of nuts should be performed before each start of work with a chainsaw. That there is such a tool, such as a chainsaw has a huge vibration, and because of this the screws and nuts in it have variations of loosening. That is why it is very dangerous to use a chainsaw in which parts are poorly fastened.

Checking chainsaw plugs for sludge (it does not happen) must also be created, and for which the design is designed to detect sludge substitute a candle for the newest.

Chain and bar lubrication is very important. The chainsaws are equipped with a pump that feeds oil from the oil reservoir to the cutting system through special holes. Then it is already distributed by the saw chain itself. The lubricant is caught by the shanks and distributed over the whole bar and chain. For additional oil retention in chain saw shanks special holes are drilled or channels are milled. Chain lubrication on chainsaws often also includes connecting links where holes are made for lubrication. Quite abundant lubrication reduces friction and heating, thereby not only increasing the life of each saw element, but also reducing the chain stretching. Why is it in the interest of every chain saw owner to watch the chain lubrication process, so that if the chain breaks down, you don’t have to find a new chain on your chain saw.

The lubrication process is quite simple: as the saw chain drives off, fine oil droplets form an oil slick on any light-colored surface if the bar tip touches it. If there is no trace, there is no grease and you need to check for oil, clean the bar groove, adjust the saw’s pump, etc.д.

And one more thing: in modern saws it is allowed to install chains and bars of different length, but before you use the new headset, you should make sure that the oil pump installed in the saw can cope with its handling.

In the course of long-term chain saw use, some of its elements and components deteriorate. One of the more vulnerable components is the oil pump. For all these reasons, many chain saw owners have the question of how to repair the oil pump on their chain saw.

The oil pump’s job is to pump lubricant into the chain to keep it flowing smoothly over the guide bar. When the oil pump burns out, the chain lubrication gets worse, which minimizes the chainsaw’s efficiency. This can sometimes cause the chain to break. To prevent bad moments, it is necessary to repair the oil pump in time. How to do it?

Oil pumps are of course made of metal and plastic. They are also divided into two types, which differ in their own design:

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The pump is driven by the movement of the drive sprocket. In the course of the chain movement the oil is fed into a special channel on the guide bar. At idle speed (when the chainwheel is not turning) the pump does not deliver oil. this is designed to save oil.

The speed and amount of lubricant applied to the chain is directly related to the number of sprocket revolutions. Some chain saw models have a manual adjustment system with a special screw on the chain saw body. On high-priced models the oil flow is regulated by an automatic.

There are two types of chain lubrication problems that can occur while the chain saw is running:

  • Lack of oil flow you like is caused by a variety of reasons. If you don’t take action soon, it will get worse, and the chain will be in worse condition.
  • Excessive oil flow.

Puddles of lubricant can accumulate under the saw after extended periods of use. This not so much affects the consumption of oil, which will have to pour in continuously, and bad impact on the environment.

Both of these problems should be corrected as soon as they are detected. This will prolong the life of the saw and reduce the consumption of lubricating water.

If oil is getting to the chain in excessive amounts, not so much at the time of the saw, or even when idling, a manual adjustment should be made (if the pump design makes this possible). This is done with the screw placed on the body near the guide bar, you, underneath or otherwise from the side. Tightening the screw minimizes the oil flow, loosening the screw minimizes the oil flow. If the adjustment does not help, you need to check the serviceability of the pump, in addition to look at the bar. perhaps at its junction with the body formed a gap through which the oil flows by the chain.

READ Blade for chain sharpening machine

Lack of oil you like is caused by several reasons, for all of which there is a professional solution:

  • Oil pump malfunction. Usually it consists of a gasket that is not applicable. To be able to change it, you need to carefully disassemble the pump so as not to destroy its moving parts. Next, a new gasket is installed, after the pump is assembled and installed to the area.
  • Breakage of the oil hose. If the passage, if the pump gasket is serviceable, otherwise its replacement did not serve the result, you should check the tightness of the hose. If it is faulty. must be replaced. Otherwise you need to clean it and fix it with sealant.

How to adjust the oil flow on the chainsaw

If the cause is not a pump failure, you need to look around for clogs and channels, and having the need to clean them from foreign objects. This will be done with a high-pressure air jet.

Troubleshooting the oil pump: chain saw repair

If the chainsaw is used for a long time its individual components can break down. often than not, the chainsaw oil pump will need repairing. This is due to the fact that in the process of sawing produces a large amount of chips, which can get into the working mechanism.

Fixing oil leaks

Many chain saw models have oil pump malfunctions in the course of their operation. The nature of these malfunctions can vary, but in the end it results in oil leaks. over, such leaks can occur even when the saw is in the prone position. This is caused by uneven distribution of fluid in the storage tank.

Leaks also occur because chainsaw oil pumps have a hose fitting on their housing. A leaking connection between the oil reservoir and the pump can result in oily droplets.

Such problems can be solved by taking the saw apart and repairing the oil pump. Extreme care must be taken during disassembly to prevent damage to moving parts of the pump. You will also need the following tools for this:

Most chain saw oil pumps consist of two main halves. In one half is the working mechanism, and in the second. the accumulation chamber.

If the pump leaks, it is necessary to replace the gasket between the two parts of the mechanism.

To repair, you need to take the machine apart into halves without touching the working part. In the place of their connection there should be a gasket. In the event that it has large squeezed areas, the gasket must be replaced.

If the gasket is good, it must be wiped down and put back in place. After that, the hose should be checked. It should not have cracks and crevices, which would compromise its tightness. If this malfunction is found, the hose must be replaced. If the hose is good, it should be washed, degreased and put on a sealant.

Then all the outlets are checked and must be free of foreign objects (debris, slag, etc.). д.). This debris will cause blockages which will result in vacuum plugs. If this is found, the lines should be checked to ensure they are free of debris. This can be done with compressed air.

Repair of oil pump

An oil pump normally consists of two pump halves with a gasket between them. The first thing to do during the repair is to check its condition. To do this, the pump is carefully dismantled into two parts (carefully, do not damage the moving parts of the mechanism), then the gasket is removed and checked. If it is damaged, it must be replaced with a new one, and then the pump must be assembled. If replacing the gasket is not successful, or if its condition at the time of disassembly is satisfactory, carefully inspect the hoses through which the oil flows. The connections to the pump connections must be airtight. There must not be any cracks or crevices on the surface that could lead to oil leakage.

Exhaust ducts, through which the lubricating oil flows into the hoses, should be blown out with compressed air. After the measures have been taken, apply sealant to the surface of the spigots and put the hoses on them.

But if you are still not sure that you can properly and without consequences to carry out the repair of the oil pump of a chainsaw, ask for help from our experts! They will diagnose your tool and take the necessary steps to get enough oil back into the chain.

Malfunctions and methods of their elimination

Problems with the oil pump can be divided into two categories. The first is complete absence of oil supply, the second. leakage. Depending on the type of problem and the main symptom, they will need to take different measures.

No oil flow

If there is no oil supply to the saw head, but you do not notice any leaks, it can be assumed that the plunger remains stationary. Why is the plunger standing in place?? It can either be worn out or the screw to which it is connected is not properly installed. The latter may be standing in an unnatural position, which is often due to improper assembly of this assembly.

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We need to be guided by /-, special marks. Such marks, of course, can be lined up in the correct position, but the screw will not stand as it should (opposite). How to fix such a problem? Simply disassemble the pump and put the screw on properly. Sometimes it is enough to turn it to the “-” mark. The screw can’t just stand there by itself, that’s why it blocks the plunger movement.

And how do you tell if the plunger is worn out? Pay attention to its end, or rather to the edge of this end, which can be ground. Then at this point you won’t see the characteristic protruding part. This place with the entire edge will be about level. How to solve the problem? There are two possibilities:

If you choose the second option, don’t forget to grind down the shoulder in the center. Keep in mind that the pump will work after turning, but the oil will increase due to the shift of the plunger.

Occasionally another problem happens, when the oil is leaking, but the pump doesn’t work as it should. Then you have to check the inlet and outlet hose. One of them might come off. If it happened to the inlet hose, oil will leak even when the saw isn’t running. If the output hose has become disconnected, oil will flow when the saw is running. It is easy to solve this problem, just connect the hoses again.


It would seem that we have looked at the cause of the oil leak. Yes, that’s right, sometimes it happens because the hoses are disconnected. But it has nothing to do with the pump itself. So now let’s consider the causes of leaks, which are associated with malfunctions of the pump.

When the rubber seal is no longer hermetically sealing, leakage may be detected. The gasket may be badly worn, or it may not be installed properly.

Before you look for a new pump on your Partner chainsaw due to persistent leaks, remove the components and examine the collar, which may be installed collar turned to the oil reservoir. If it is standing like this, turn it around about 180 degrees. If you see that the seal is worn, replace it with a new one. Of course, try to find the perfect collar. If you can’t find one, buy a seal ring at a plumbing store.

If you still see leaks afterwards, examine the walls of the pump cylinder, which may be worn out. In such a case, it is easier to buy a new pump.

Preventive measures

The chainsaw oil pump should be serviced periodically to prevent leakage of lubricant. During and after operation, oil leaks must be monitored and if any are detected, the coupling elements must be retightened immediately.

Poor oil quality not only affects the chainsaw pump itself, but also the durability of the cutting chain.

Check the level in the lubricant reservoir before beginning work. It is best to use the chain oil recommended by the manufacturer. The chainsaw can only be used for its intended purpose if it is used in accordance with the instructions in the instruction manual.

To prevent the formation of vacuum jams in the lubrication system, periodically blow through the oil pump passages with compressed air. After you have finished sawing, it is best to clean sawdust and dirt from the saw blade. At the beginning of the season it is necessary to suspend the chainsaw in an upright position for a few minutes in the operating position in order to spread the lubricating fluid evenly through the channels.

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Assembly of the Partner 350

In order to properly assemble the Partner 350, you must install all items in the reverse order of removal.

If this is the first time you have ever repaired a Partner 350 chain saw, make sure to disassemble the parts in the same order you removed them. This will prevent you from getting confused and forgetting to set any of the assemblies.

An important feature of the Partner 350 chain saw engine assembly is that the crankcase cover is installed without a gasket. You can use red sealant instead and apply a thin layer of sealant to the crankcase mounting location. Before you apply sealant, you need to degrease the crankcase cover and the place of its installation, for better adhesion of sealant.

disassemble, pump, chainsaw

Adjusting the flywheel and coil clearance (ignition adjustment)

While reassembling the Partner 350 if you removed not only the flywheel but also the ignition coil, you will need to adjust the gap between them. To do this, first you install the flywheel, then a piece of half a liter plastic bottle is placed on it, and then put the coil and fixed the two fixing screws, while the flywheel should be turned to the coil magnetic contacts.

After adjusting the clearance, turn the flywheel. If it does not hit the contacts of the coil, then the gap is set correctly.

Oil pump troubleshooting: chainsaw repair

Continuous use of a chainsaw may lead to the failure of individual components. In most cases the chainsaw oil pump needs to be repaired. This is justified by the fact that in the process of sawing a huge amount of chips appear, which can get into the working mechanism.

Repairing oil leaks

Many chain saw models have an oil pump that fails during use. The nature of these defects can vary, but in the end it leads to oil leakage. over, such leaks can occur even when the saw is in the prone position. Using a Partner 350 chain saw with an engine and how to remove the chain sprocket from the. Hi, how do you remove the oil pump to change the chain saw? STIHL oil pump ms180, how to order. STIHL chain saw oil pump 1123-640-3200. Reason: the water does not disperse evenly over the oil reservoir.

Also, leaks occur due to the fact that oil pumps for chain saws have on its own body a fitting for attaching a hose. A loose connection between the water tank and the pump can result in oily droplets.

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