Stihl 250 Oil Supply To The Chain
By all means, whoever owns chainsaws knows how important is not a bad and high-quality oil. And, everyone dreams, it is not necessary to say what really is, that this is a typical “life force” of a given device for real and effective work. Today, there is an unlimited number of oils and, as the saying goes, the choice is very large.
But, often, not every owner of this type of electrical equipment knows what oil to use for his own steel friend, so that the work of the chainsaw is not only easy, but also productive. Therefore, the question regarding the correct choice of the Stihl manufacturer will be considered below. Also, what is it like to help a chainsaw at the time of its specific activity, and not harm it. What is needed, let’s get started.
Let’s talk about the oil supply device directly to the circuit
Mostly I want to focus on what remains to be done to our client. Stihl chainsaws are quite small but, nevertheless, they are very massive. These features and attract future buyers of this kind of technology to the models of this company. In addition, you can easily and simply create various manipulations with this device regarding work with wood species (see how to cut a tree).
Chain oil feeder
Adjusting the oil supply for the Stihl 180 chainsaw.
Stihl chainsaws also have high cutting ability. over, this equipment is equipped with the latest accessories (see Chainsaw attachment angle grinder) additional, which contributes to the convenience and ease of operation. But actually, let’s talk directly about the device itself, which the manufacturer equipped its chainsaws with. So, the direct chain lubrication system of a Stihl chainsaw consists of:
- Tire guide;
- Saw chain;
- Oil pump.
It is worth noting that direct oil flow through the operation of the pump has special adjustment. It is also an important fact that the chain is lubricated throughout the operation of the chainsaw. For this reason, this part has served its owner for quite some time.
Undoubtedly, during operation, the chain must be systematically lubricated, therefore, oil for its direct lubrication must flow continuously to its surface. Since this is the entire direct construction of the tool.
During the operation of the device, oil directly starts to come out of the groove of the tire and is immediately absorbed by sawdust.
That is why the chain lubrication process itself made automatically. But it is worth noting that there are such models that have the so-called "dosage" of oil, which should be fed directly to the circuit. And of course, models, the price category of which is quite low, have only a manual pump that works directly through the action of the drive, which is located on the handle.
Choosing the right oil
After you purchased the device, you immediately had a question: what kind of oil should I put in a Stihl chainsaw? If you properly care for equipment intended for work in the construction and gardening fields, you can significantly increase the level of activity of the direct operation of the device itself without encountering breakdowns of a different nature.
The right lubricant
It is worth noting that the most important factors of the direct operability of the device is the use proper lubricant and fuel. Although the main problems for the owners of this equipment are precisely with the choice of oil for their "favorites". In this paragraph you can find out how to select the lubricant specifically for Stihl chainsaws.
I want to apply it to the TAD 17 chain on a Stihl 250 chainsaw. In winter it is very thick, will the oil pump be worse from this, will it fail from overload? And if it’s possible, what’s the principle, in the pump, of supplying oil to the circuit?
The oil pump, which is set at 180. 250 Styles. is generally practically indestructible. it has a brass cylinder. Even mining consumes twice as long as aluminum.
And the principle of operation is very simple. It’s a pity there is no illustration, and I haven’t seen it anywhere. If in words. two parts, a cylinder and a plunger rotating in it. The plunger has a milled scaffold at the end. During rotation, the plunger moves slightly back and forth.
Two holes are made in the cylinder against each other. When the flat of the plunger approaches the intake hole, it is slightly pulled out of the cylinder. a vacuum is created and a little oil is sucked in.
when the flat turns to the discharge hole, the plunger moves into the cylinder. pressure is created, oil flows through the channel to the tire. As you can see, in principle, you can’t damage the pump as much as you like with thick oil. it just won’t go and that’s it.
If the oil flows out of the tank in chainsaw idle mode. is this normal? Those. if you have to cut a little bit, then pour a little bit? And then during the inactivity of the saw, oil from the tank flows completely.
Not. This not normal. The problem is either with the oil pump or with the tank itself. In general, oil and fuel consumption is usually 1 to 1.
Leading tire sprocket on a chainsaw, how to lubricate? Is Mobil or Jcb hydraulic grease suitable, for example? What do you think?
stars on all tires (except Calm) are smeared, if you don’t smear, the bearing may crumble, and then the tire ends, and about Calm tires. on the one hand, it’s like a plus, and on the other. I saw Calm almost new tires with burned bearings.
A chainsaw drives a chain lubrication oil. At idle it pours very slowly, you give gas. it pours. In five minutes, all the oil is poured.
Does not respond to the position of the adjusting screw. Also, a little (0.5-1 mm), the sprocket, which rotates the chain, plays. Who faced such a thing?
You need to remove the asterisk and sort out the oil pump, and check the hoses for gusts. The drive sprocket must have a slight play. It should not be hard, vibration will go to the crankshaft.
The holes coincide when I put it, maybe when pulling up the chain, the hole moves away because oil does not get on the chain, but the chains can be used alone, how to blunt, remove, put in a new one, the old one to sharpen, etc. do so far in a cycle of three chains the tire did not run off?
The oval hole for lubrication on the chainsaw body is made in such a way that at any position of the tire within the range of adjustment by the chain tensioner, the combination of the lubricant holes on the tire and the body does not disappear.
Ideally, a set of chains, when using them on a saw in turn in a cyclic mode, and the bus should become unusable at the same time. There are two lubrication options. Well, in the sense. through which oil is supplied.
Most tires have a separate hole for lubricating the chain, and these large ones are used for tensioning. And some (and quite a few) do not have a separate lubrication hole.
And for lubrication, a free tension hole is used. In this case, it will certainly communicate with the groove of the tire. You can check the wire. This is neither good nor bad, it is a feature.
So. in the second case, quite large oil losses are possible if the sprocket cover does not fit snugly. Then it goes just right through (unlike tires with a separate hole), and drips down.
After a minute of idling the chainsaw, I pressed the gas a little several times on the gas to lubricate the chain, it began to flow very strongly onto the chain, which already formed a pool of oil under the saw. Where is the screw for adjusting the oil supply to the circuit? And how to make this adjustment?
Your model does not have an oil flow adjustment to the circuit; oil is automatically supplied. Carefully inspect and thoroughly clean the oil intake holes on the tire, carefully install the tire with a chain. In theory, it should help.
If a puddle of oil forms under the saw, then the most probable is a loose tire or a clutch cover that is skewed, resulting in a gap between the oil pump outlet and the tire lubrication hole, into which the oil escapes.
Tell us more about the oil pumps installed in chainsaws.
Very rarely on modern chain saws (including electric ones) non-plunger pumps are used. It can be said that they are not even applied at all. All of them work according to the same scheme.
The main details are an aluminum cylinder, rigidly fixed in the body and a steel plunger with a plastic gear, rotating in this cylinder. How it works: There is one small hole at the blind end of the cylinder. There is one more opposite.
One of them is suction, the second is pressure. On the plastic gear of the plunger there is an oblique annular groove, which is combined with a metal rod in the housing.
Видео: Stihl 250 Oil Supply To The Chain
Mechanics: When the plunger rotates due to the oblique groove, it also makes back and forth movements back and forth for each revolution.
Hydraulics: When the cut portion of the end of the plunger approaches the suction port, the plunger is pulled back. a small vacuum is created, a portion of the oil is sucked into the cylinder.
Turning the plunger about half a turn. the cut-off section (of course, with the oil in it) fits the discharge hole.
At this time, the plunger moves towards the blind end of the cylinder. Some pressure is created, the oil enters the lubrication channel.
Now, about the differences in design: The gear on the plunger can be metal. In this case, the worm on the crankshaft will be plastic, you can’t get anywhere, it should be
The pump housing may be metal. Well, not bad, of course, but not fundamentally.
And most importantly. the adjustment of the oil supply. In the first case, when the axial movement of the plunger is carried out by an oblique annular groove.
Performance adjustment is not technically possible. If the longitudinal movement is due to an oblique cut of the back of the plunger, flow adjustment is possible.
Using different variants of the adjustable stop of the rear part of the plunger, the length of its axial movement and, accordingly, the amount of oil captured per revolution of the plunger are changed.
how often do you need to syringe a chainsaw tire? And as I understand it, the lubricant should be consistent, like lithol approximately? Or is the same transmission permissible?
I bought a new chain, installed, it works fine. But after a couple of minutes, the hole in the tire for oil supply is blocked, and the chain goes dry.
Literally enough for one cut. Again, disassemble, clean, run. Without sawing, the chain is lubricated. And after one cut, the tire is again clogged with chips.
I didn’t try Gazanut, because I didn’t have time, the chain almost wedges, I can’t turn it by hand, and the tire and chain are terribly hot, the chainsaw stalls. Tell me what the problem is, with the old chain this was not observed?
There is a big suspicion that the lubricating oil is actually going on, only because of the large amount of dust (perhaps now saw dry wood, or even with dust) falling into the groove of the tire and it is not visible on the chain.
What is the condition of the tire itself? In this case, the condition of the driven sprocket and tire spacers (the chain slides during operation) in those places where the teeth of the sprocket during rotation is especially important "dive" inside the tire or appear from there.
Also, in case of excessive wear of the spacers, the depth of the groove of the tire and the chain shanks can cling to the bottom of the groove during movement, could decrease below an acceptable level.
In this case, too, there will be excessive heating of the circuit and bus. After all, apparently this chain is not the first for the tire.
In addition, the fact that the saw stalls when the chain is jammed indicates a malfunctioning clutch. There is either dirt between the clutch cams and its cup, or the cup itself is deformed. Clutch springs may be stretched.
One of the important chainsaw systems, work without which is impossible, is the system of forced lubrication of the chainsaw chains. It’s no secret that at the time of the saw’s operation, the chain abrases on the chainsaw tire, which causes it to heat up and premature wear. To mitigate friction, the chain mechanism must be constantly lubricated.
Chainsaw Chain Lubrication System
To supply oil to lubricate the chainsaw chains, a special pump is used in the tool, which is dosed, depending on the number of engine revolutions, supplies lubricant to the saw bar.
The system uses oil to lubricate the chainsaw chain, which has improved adhesion properties, this is necessary for uniform distribution of oil around the entire perimeter of the tire and hold on it even at high speeds of chain rotation. Let us consider in more detail the oil supply system implemented in modern chainsaws.
Lubrication system device
Depending on the brand of the chainsaw, the details of the lubrication system may vary slightly constructively, but their total number and connection diagram remains unchanged.
The main components of a lubrication system are:
- An oil tank is usually located in the crankcase.
- The filter element is installed in the tank.
- The oil pipe is a small diameter hose made of oil resistant rubber.
- The heart of the system is the oil pump.
- Worm gear gear transmitting force from the engine to the pump.
- Chainsaw tire, it can also be considered an element of the lubrication system, as it has special holes for oil supply, by the way, the chain itself is involved in the transportation of oil and accordingly also has some elements designed specifically to provide lubrication.
Principle of operation
The main unit of the system is the pump. The principle of his work is as follows. With an increase in engine speed, a gear mounted on the main shaft drives the pump shaft through a worm gear. In turn, the rotation of the shaft creates a certain pressure in the oil line, which causes the oil to move along it towards the tire.
The end of the oil channel is located at the place where the tire contacts the tool case, where there is a longitudinal groove onto which the oil channel enters when the tire is installed.
Grooving is necessary to ensure that oil is supplied to the tire, regardless of the degree of chain tension of the chainsaw. Simply put, no matter what position the tire is at the time of operation, oil will flow through the groove through it.
Further, a chain is included in the lubrication process, on the links of which, depending on the model of the chain, there is either a groove or a hole through which the oil is dispersed throughout the tire. With an increase in engine speed, the oil feed rate also increases.
Some chainsaw models are equipped with pumps that additionally have a capacity control, and if necessary, the amount of oil supplied by the lubrication system can be increased or decreased.
This function is quite convenient, because it allows you to save and not to waste extra oil.
Lubrication system malfunctions and how they are eliminated
The main malfunctions of the oil supply system on a chainsaw can be divided into two main types, these are general malfunctions inherent in all chainsaws and individual ones, which can vary depending on the type of pump and worm gear installed on a particular model. Let’s start sorting out the faults in order.
Working with a chainsaw if the chain is not lubricated is prohibited. This adversely affects the tire, the drive sprocket and the chain, and can also result in serious repair costs.
Signs of a malfunction of the lubrication system, checking its performance
- The chain of the chainsaw is dry and has a pale shade without shine.
- The chain stretches relatively quickly.
- The tire is very hot and may even partially melt the paint.
- Oil from the tank is practically not reduced.
- Sharp chain cut efficiency
All these signs indicate that the lubrication process is abnormal. In order to check the oil supply by the lubrication system, it is necessary to remove the side tire of the chainsaw and start it. Next, you need to slightly increase the speed while observing the end of the oil line. If oil comes in, most likely its quantity is not enough for normal lubrication and you need to clean or replace the filter and, if possible, adjust the flow. In the case when it does not arrive, the problem is more serious and requires further diagnosis.
There is a way to check the oil supply without removing the tire. To do this, it is necessary to direct the end of the tire to the side, for example, of freshly sawn chocks from the cut side and maximize the speed, while you should try to keep the end of the tire at a distance of no more than 10 cm from the chocks. If oily stains begin to appear on its surface. then the oil is supplied.
Once it has been determined that no oil is being supplied, further diagnostics are only possible if the oil system is completely removed. Of course, filter replacement helps in some situations, but this is very rare.
Access to the oil pump of some models of saws is possible only after complete disassembly, respectively, having no skills in repairing gas tools, it is better to entrust the repair to professionals.
Most common malfunctions
- Breakage of an oil hose. It can sometimes be found during visual inspection. The problem is solved by replacing the defective part.
- Lack of thread on the shaft of the oil pump will help replace it.
- A defective thread on the pump drive gear is likewise solved by installing a new part.
- No corkscrew of the main shaft (relevant for some models of tools, for example, Homelite). You can fix it by installing a corkscrew that is suitable for the diameter of cloves instead of the native corkscrew, cutting it to the required length.
- Blockage in the highway. It can be removed by blowing with compressed air or mechanically, using a wire of suitable diameter.
- Clogged filter element.
- The Stihl MS 180, whose pump is not separable, often clogs. You can try to rinse in clean gasoline if it does not help replace it.
- In Chinese chainsaws (Gypsy), very often cuts the grooves on the main gear, through which the force from the sprocket is transmitted to it.
Stihl MS 180 individual lubrication system malfunction
Due to the fact that the Stihl MS 180 is one of the most common chainsaw models, I would like to dwell on one malfunction inherent only to it and describe a method for eliminating it without replacing parts.
Quite often on a Stihl MS 180 chainsaw, there is a depressurization of the oil line in the place where the oil pipe coming from the tank is installed in the saw body. The malfunction can be determined by the characteristic smudges on the bottom of the tool.
To eliminate the malfunction, it is necessary to remove the chainsaw handle, remove the hose from the bore hole, clean and degrease it. After all these manipulations, apply sealant to the hose seat and install in the chainsaw body.
You can learn more about troubleshooting and a complete diagnosis of the Stihl chainsaw lubrication system by watching the video, which shows step by step the process of disassembling and repairing the lubrication system.
In modern chainsaws, a reliable supply of lubricant for the chain is organized, in case of malfunctions of which, it is not worth operating the chainsaw in order to avoid further breakdowns. It is better to troubleshoot the lubrication system by contacting a service center or a specialist with repair experience, this ensures the quality of the final result.