Chain lubrication system in chainsaw malfunctions
What are the breakdowns in the chain lubrication system:
In the first case, first inspect the channels that carry oil to the bar and clean them. Their clogging. a fairly common occurrence.
If there is a significant oil leak (a slight oil leak is normal in all gasoline saws) you should check the oil pump tubes and fittings for leaks. The tubes can fall off or even crack. Tubing leaks can be repaired by replacing or caulking with sealing material.
As for the oil pump, then different models of chain saws can be different designs, and the drive is also carried out differently (as a rule, the drive is performed by a drive sprocket or a special gear on the crankshaft). If the problem with the oil pump, then most often it is not necessary to replace this entire unit, it will be enough to replace its moving part (plunger), it most often fails due to ingress of large amounts of dirt and sawdust.
The most serious damage is a crack in the oil pump housing. In this case, you will have to replace it completely.
Starting the engine of a gasoline chainsaw is a multi-level procedure, during which almost all units of the tool are actuated. One of the first signs of a chainsaw motor malfunction is the absence of an increase in the engine speed. This can manifest itself in different ways: the engine may work with interruptions in idling, or not pick up the required revolutions under load. i.e. when the gas trigger is pulled. In any of these cases, you need to disassemble the tool and carefully inspect its internal construction.
Breakdowns, due to which the chainsaw does not develop revolutions, are:
- engine failure. The first thing that can happen is wear of the motor, that is, its final depletion. This will be evidenced by numerous scuffs and burrs on the surface of the cylinder/core parts, deformation of the crankshaft, or through holes inside other parts. In this case, the only thing that can help is to replace the motor, which is tantamount to buying a new chainsaw;
- The carburetor settings are disturbed. if the steel jets on the fuel assembly were displaced, they will need to be set according to the instruction manual;
- a spark plug that is covered with oil or has a defective spark plug. The first thing to do is to clean the spark plug of dried engine oil. If that does not help and the saw still does not rev up, then the spark plug needs to be replaced.
When cleaning the spark plug you must be very careful not to damage the tip. This is responsible for creating the spark that is needed to ignite the fuel.
the first thing you should bear in mind when buying this type of tool is that some of its components should be replaced with new ones when their service life is up. That’s why you should always have the manual at hand, because it explains everything in great detail.
These parts include: the sprocket (drive), the bar, part of the system (anti-vibration), and the chain. It should not be forgotten that if this “stuffing” is not replaced with a new one in due time, these worn out parts will negatively influence the rest of the chainsaw‘s parts. It is for this reason often enough to make a check of the depth of the immediate depletion of the teeth. Keep in mind that it should not be higher than 0.5mm.
Why does the chain saw choke on heat
The situation in which the chainsaw starts up in the cold, and in the process of heating can stall, is familiar to many who have dealt with them. The main reasons for this saw’s behavior are as follows.
- Faulty ignition module (coil). You can determine the fault by checking the spark first on a cold engine and then on a hot engine. If you have no spark on a hot engine, you should try to rectify the problem by changing the ignition coil.
- The chainsaw carburetor has a wrong setting (floods the spark plug when it is hot). You can see the problem by the way the saw starts in cold conditions. If you do not need to close the choke in order to start the engine in cold start, and the engine starts without preflash, it means that the fuel mix is formed incorrectly and after the engine warms up, the fuel floods the plug and makes starting impossible. The problem can be eliminated by adjusting the carburetor.
- Spark plug is faulty. In such a situation, similar to a faulty ignition coil, the spark disappears when the engine heats up. It is worth trying to replace the spark plug with a new one, and if that does not help, you need to check the ignition coil and the gap between it and the flywheel.
You can check the ignition coil with a multimeter or replace it with a known good one. Check the primary and secondary winding with a multimeter in resistance measurement mode. The resistance value of the primary winding, the working coil, is 1 kOhm. the secondary 4 kOhm.
Probable causes of failure
The power unit of all chainsaws is a single-cylinder internal combustion engine. This type of device is characterized by such malfunctions as a violation of intra-cylinder compression, changes in the fuel mixture ratio, improper ignition operation, poor-quality fuel and lubricants. The main problems in the operation of the power unit are as follows
- engine runs steadily at minimum rpm, but stalls when rpm is increased;
- starting is normal, but the idle rpm is unstable, throttles quickly;
- fails to start.
Chainsaw electronic ignition diagram.
Idling abnormal operation may be caused by various reasons. They can be divided into several positions:
- reduced capacity of filters (gasoline and air);
- abnormal operation of the ignition system:
- spontaneously changed carburetor settings;
- the failure of the elements of the gasoline line;
- clogged exhaust ducts, muffler;
- piston, cylinder, valve defects.
Repair should begin with an external inspection and check the presence of fuel in the tank.
Why the chainsaw won’t pick up speed?
If the chainsaw you are using fails to rev steadily gain speed and stops on impact, it is necessary to carefully check the throttle housing and carburettor. First of all, the operator must carefully inspect the assemblies and make sure that they are not sealed. If a large amount of oil was found inside the crankcase or carburetor, then it is necessary to fix the leak inside the faulty assembly.
The next reason why the chainsaw does not pick up speed is a factory defect or mechanical damage to the breather, located inside the fuel tank. You can get a vacuum in the fuel tank, which leads to a lack of fuel supply to the power unit’s working cylinder. Another cause of this problem may be deposits accumulated on the surface of the fuel cylinder. In that case you need to remove the filter element and wash it in clean gasoline. If after that the chain saw keeps stopping on loading it is necessary to carry out the following procedure: stop the engine, take off the fuel cap and put the fuel tank back on. If after that the power tool motor begins to pick up speed and after 5 minutes of work stops again, it means that the cause of the problem is a faulty breather valve.
Another common cause of a no-running saw motor can be a thick layer of soot on the walls of the factory muffler. Resin and ash deposits will prevent exhaust gases from escaping, causing them to flow back into the engine compartment. As a result, the engine will start to make a noise and lose speed even with a slight depressing of the gas pedal.
Problems related to malfunction of the fuel system
A chainsaw sometimes shuts down when idling also because the fuel line is not intact or the mixture of gasoline and oil is mixed incorrectly.
Before starting up the cutting attachment you should visually inspect it and look for possible defects in the surface of the housing, mechanical damage or leaking working fluids. This should also be done for the fuel line of the saw, which is usually a rubber tube.
Chainsaw Won’t Start (Easily Fixed) Must See!
If the machine was (especially for a long time) in a damp place and had to endure drastic fluctuations in air temperature, this tube could simply crack. Such a fuel line is not good for further use and should be replaced.
Another reason why the chainsaw at idle speed can stall is the failure to observe the ratio of ingredients when preparing the “fuel mixture”. The proportions of gasoline and oil in it should correspond exactly to the manufacturer’s instructions for the particular machine. If they are not observed, the engine will not be lubricated sufficiently, and the entire mechanism will persistently stall.
Chainsaw carburetor adjustment.
Why it may be necessary to adjust the carburetor even if it seems to start and run? The carburetor adjustments should be optimal.
In general, the carburetor has a very important influence on the work of the chainsaw, it is its brain, specifying how much air and fuel mixture to feed into the cylinder and in what proportion. If it is too rich, i.e. there is more fuel in it, as a result we have a power loss, deposits on the cylinder walls and piston. Which in turn can cause the chainsaw to malfunction. In turn, a lean mixture that has more air in its composition also leads to loss of power, insufficient lubrication of the cylinder gear, scuffing and possible engine seizure. Optimum settings of the chainsaw carburetor allow you to get maximum power, extend engine life, and ensure minimum emissions!
Fuel and air filter problems and troubleshooting
Your chainsaw will stop when idling if the fuel or air filter is clogged. To find out the condition of the first element of the fuel system, you should disconnect the fuel line from the carburetor. If fuel doses are coming in at the correct doses when pecking, the cause of the malfunction should be looked for elsewhere. If the gasoline to the carburetor weakly or does not flow from the hose at all, then most likely the filter is clogged with debris.
To clean it, remove it from the tank (all fuel should be drained from the tank before this time). Pull out through the filler neck of the tank with a wire hook. The filter is disconnected from the suction hose. If possible, the filter is cleaned. If there is no such possibility or it is inexpedient to do it for various reasons, the used filter is replaced with a new one.
The chain saw may malfunction if the fuel filter is clogged.
The air filter may also become clogged with dirt or dust, and cause malfunctions at idle speed. Remember that clogging of this filter occurs quite often, as a result of which the flow of air into the system is hindered. The fuel-air mixture has a higher percentage of gasoline and is unnecessarily enriched. Do not expect normal engine operation in such a case.
To clean the air filter, take it out carefully so as not to throw dust into the carburettor. Then it is cleaned and thoroughly rinsed. Add detergent to the flushing water. After drying the air filter is returned to its place in the chainsaw.
It is recommended to change the fuel and air filters every 3 months for normal operation of the cutting tool.