Chainsaw idle rpm increases when run switch on stop-why?
Why a chainsaw won’t pick up speed and shuts down
If the chainsaw is unable to pick up speed in a minute after starting or stops when you pull the throttle trigger, the carburetor or engine crankcase is most likely leaking. As in the previous case, the problem can be solved by checking for leaks and adjusting the carburetor.
If your chain saw doesn’t pick up speed and stops after it has been running fine for about 5 minutes, the problem might be a faulty fuel tank breather. Vacuum created in the fuel tank during the operation of the tool does not allow the engine to get the necessary amount of fuel for normal operation, and for this reason it will be unable to gain speed or to stall. If you stop the tool, open and close the fuel cap, and start the chain saw again, the tool will operate normally for about five minutes, after which it will either stop revving or choke.
The chainsaw will not pick up speed if it has excessive soot in the muffler, which prevents the exhaust gases from coming out, thus reducing engine power and speed.
If you want to check the crankcase for leaks but do not have a special tool, you can use the following inspection procedure.
Algorithm for checking the oil sump for leaks
- Remove the side cover and guide bar from the chainsaw.
- Unscrew the spark plug and through the spark plug hole put a string with knots in the cylinder, thereby stopping the movement of the piston and crankshaft.
- You can use an old starter cord as a cord with knots, tying knots on it every 3-5 cm.
- Unscrew the chain saw’s drive sprocket.
- Remove the oil pump cover and the pump itself.
- Remove the starter motor from the chainsaw.
- Unscrew and remove the flywheel.
- Remove the carburetor.
- Using a syringe, through the hole under the carburetor in the cylinder, pour petrol into the crankcase, watching the crankshaft oil seals. If gasoline will leak through them, then the glands are in disrepair and need to be replaced with new ones.
- It’s better to let a professional do the packing installation.
An indirect sign of a leaking oil sump is oil leaking from the oil seals.
What to do if the chainsaw keeps cutting off when you press the gas
One of the most common questions about the work of this device: why does the chainsaw stalls when you press the gas and what to do to solve the problem? In such a situation it is necessary to perform the following actions:
- Check the fuel filter;
- Inspect the fuel hoses for leaks;
- Check the muffler;
- try a little more rpm;
- Check the condition of the rubber seals on the crankshaft.
STIHL MS 180 repair / carburetor disassembly and assembly / cuts out at idle speed
Filters often get clogged, especially when the chain saw is operated more than once a day. There is an option to remove the air filter and rinse it under warm water. Before putting it in place, dry it thoroughly.
If no fluid flows from the carburettor after disconnecting the fuel hose, it is blocked. It can be cleaned or replaced with a new one.
Chain keeps moving at idle clutch repair chainsaw
If the tool is used frequently, the gasoline pump can fail. Every part has an expiration date. It should be replaced as it is also referred to the service center.
Horizontally the fuel tube is on the day of the tank, if the tool is tilted, the fuel will not be able to cover it one hundred percent. Exactly this is a prerequisite that the chainsaw stops working when tilted, because the tube levitates in the air and it does not get the necessary amount of consistency.
If you saw that the chainsaw easily starts without warming up, and after warming up it stops. And it will not start until it cools down, then there may be a few problems.
You need a leak in the hose, packing or gasket. And check the muffler for carbon deposits. The 3rd reason is the cylinder piston group (Cylinder Block) and whether there are any burrs or irregularities.
The lightweight and compact model is used for household purposes, but despite its optimized performance, sometimes the STIHL chain saw will not start. Problems are manifested when the engine starts and stops, runs unsteadily, cannot develop the proper power, or suddenly rises high.
Why does it stop when idling?
The first and most common cause of this problem is improper carburetor adjustment. To perform the adjustment of the idle speed is an option without assistance from others, for this purpose, you need to have a screwdriver adjustment STIHL, which comes with the unit. The adjustment hole is on the right side of the STIHL 180 on the handle and is marked with “-” and “-“.
Chainsaw Chain Won’t Stop at idleFIX
If the STIHL chain saw does not hold rpms and stops idling, of course, is 90% sure that it has a problem with the fuel pump, usually an air leak in the crankcase through the sump gasket, or much more often through the crankshaft oil seal. Air intake reduces or completely blocks the flow of fuel through appropriate channels to the STIHL 180 STIHL fuel pump. STIHL 180 chain saw does not get enough fuel and stops to idle.
You can make a diagnosis using a special device called a vacuum gauge.
The second method to test the functionality of seals, is to pour gasoline into the crankcase and look at them, if the seals will skip gasoline, so they provide the usual pressure in the crankcase, which would make the work at idle is not feasible. And during work at high rotation speeds, with leaking seals, the possibility of jamming of the crankshaft bearings is encountered.
Checking STIHL crankcase and oil seals
- The top cover is removed.
- The case of the air filter and the carburetor is dismantled.
- The chainsaw handle is removed.
- Unscrew and remove the starter motor.
- Remove side cover and drive sprocket from the reverse of the starter motor.
- In the candle hole installed piston stopper on the other in the cylinder is stuffed starter cord from the starter with a knot tied to him.
- The flywheel and clutch are unscrewed, then the parts are removed. It is worth knowing that the chainsaw clutch has a left hand thread and can be unscrewed clockwise.
- Remove the oil pump gear.
Disassembling a STIHL MS 180 chain saw, you can meet oil seals, and then fill the crankcase with gasoline and check for leaks. Fill the crankcase through the fuel window in the cylinder and raise the piston up high for this purpose. If you find leaks, you need to change the defective seals, or re-seal the sump. Assembly STIHL 180 is an option to follow the reverse sequence of methods.
Chainsaw has long been a luxury and an indispensable tool for anyone who has at least some suburban area. Why does the chain saw stalls under load the machine stalls at idle? With its help, you can do gardening work, cutting firewood, finishing lumber and much more. There are many chainsaw models on sale, varying in both power and overall quality of performance. You can check it here. e-katalogue.You have found the problem.
But no matter what technique can be capricious, chainsaws are no exception. Let’s look at more relevant tasks.
The fuel filter is contaminated
If the air filter option didn’t work for you, then try changing the fuel filter. It is located in the gas tank and is attached to the hose through which fuel is taken from the tank.
This hose should be carefully lifted with something and take out of the tank its edge, on which the filter is fixed. Here the option of working without a filter, as in the case of the air filter, is better not to apply, because you can not know exactly whether there are any unnecessary impurities in the fuel.
So just change the fuel filter for a new one and try to work. If everything is OK, congratulations. you have found the reason.
Turning off the engine when it is running
In another version, if the chainsaw heats up and stalls, troubleshooting should be sought in the settings of the carburetor or in the high-voltage circuit of the ignition unit.
If it overheats, the spark disappears or becomes so weak that its power is insufficient to ignite the air-fuel mixture.
The engine also stops on hot when the interference resistor, which is in the tip of the spark plug, is malfunctioning.
Fuel and air filter problems and how to fix them
Chainsaw will stop when idling if fuel or air filter is clogged. To find out the condition of the first element of the fuel system, you should disconnect the gasoline line from the carburetor. If when pumping fuel comes in doses that meet the specified standards, then the cause of the malfunction should be sought elsewhere. If gasoline comes to the carburetor weakly or does not come out of the hose at all, most likely the filter is clogged with debris.
For cleaning it is removed from the tank (all fuel should be drained from the tank before this time). Remove it through the tank filler neck with a wire hook. Filter is disconnected from the suction hose. If possible the filter is cleaned. If it is not possible or not practical for various reasons, the used filter should be replaced with a new one.
The chainsaw can be shut off if the fuel filter becomes clogged.
The air filter can also be clogged with dirt or dust, causing malfunctions at idle speed. It should be remembered that clogging of this filter occurs quite often, as a result of which the flow of air into the system is hindered. The air-fuel mixture has an increased share of gasoline and is unnecessarily enriched. You should not expect normal engine operation in such a case.
To clean the air filter, it is removed with special care so as not to throw dust into the carburettor. Then it is cleaned and carefully washed. Add detergent to the flushing water. After drying, the air filter is returned to its place in the chainsaw.
It is recommended that the fuel and air filters be changed every 3 months for normal cutting tool operation.
The cause of a chainsaw stopping in the midst of operation can be
Remoteness from service stations and high cost of repair services forced the owners of faulty tools to restore their functionality on their own.
This option is only possible after the warranty period has expired. The difficulty is that the traces of dismantling of individual assemblies and units noticed by service technicians may be the reason for refusing free repair of more complex and expensive parts.