Chainsaw Stihl 180 does not develop momentum, or after you let go of the gas trigger, it continues to work without releasing momentum. These problems are quite common. Let’s try to understand the reasons, the consequence of which is the occurrence of such faults. Also in this article we consider how to diagnose if the chainsaw does not pull.
Why the chainsaw does not develop momentum?
The reasons for the lack of traction and a poor set of speed chainsaw, there may be several. Therefore, you should not immediately begin to disassemble and repair the carburetor, because the reason may be hiding and not in it.
On the Stihl ms 180 chainsaw, a reliable carburetor is installed, on which the manufacturer has limited the ability to adjust power and maximum engine speed, so when the chainsaw has a thrust, the carburetor is the last place to look for problems.
You ask, what’s the first one? The answer is a silencer. The silencer is responsible for exhaust emissions and extinguishing flames in them. Through it pass all the products of combustion, which over time can clog it. The situation with a silencer clogged with soot is far from uncommon, but it arises due to the wrong fuel mixture.
At a normal ratio of the amount of gasoline to the amount of oil, the combustion products are not saturated with soot enough to clog the muffler. In the event that the amount of oil is more than the norm, an excessive carbon deposit is formed during its combustion. Further, the soot accumulates under the piston rings and in the silencer of the Stihl 180 chainsaw. Thus, the coked silencer, this is the most harmless thing that can occur, the maximum damage from excessive soot is the need to replace the piston.
How to check the muffler?
To check the silencer, it must be removed from the chainsaw. To do this, using a 8 mm head, unscrew the two fastening nuts and remove the part.
Important: after the silencer is removed, it is necessary to check the integrity of the gaskets between it and the cylinder, since very often they stick and burst when removing the silencer.
The part can be cleaned mechanically, using screwdrivers or knitting needles, and then thoroughly blow through with compressed air. The seat on the muffler can be cleaned with sandpaper to remove the burnt part of the gasket.
Install the muffler in reverse order.
Important: at the time of tightening the nuts mounting the muffler, do not over-pull the nuts, because the thread on the screws can be broken.
The second reason why the engine of a Stihl chainsaw can reduce power and not develop speed is a blockage in the fuel system. As a rule, the first place to start the search for clogging is the fuel filter.
Fuel filter check.
The fuel filter is installed in the tank of the Stihl 180 chainsaw, and it is not very convenient to pull it out. To facilitate the process, you can take a small piece of aluminum wire and bend it at the end, then with the help of it hook on the fuel hose and remove it with the filter from the tank. To test the filter, it must be blown into it, if the air does not pass, then a reason is found, and the filter must be replaced.
If the filter is clean, check the fuel hose for blockage. To check it is necessary to disconnect it from the carburetor and with the air filter removed, blow it into it. If a blockage is detected, the hose can be cleaned mechanically, with a wire, and then purged with compressed air.
Strainer in the carburetor.
The last probable place of formation of a blockage is a strainer in the carburetor.
In order to clean the strainer, it is necessary to remove the carburetor from the Stihl 180 chainsaw. The work begins with the fact that the top cover of the saw is removed, after which, with the aid of a head 8 mm, two fastening nuts are unscrewed. Further, the filter housing is removed from the guides, after which the thrust of the air damper and the engine control lever are disconnected. The fuel hose and the throttle rod are disconnected last, after which the carburetor can be removed from the guides.
The carburetor screen filter is installed in the fuel pump chamber, in order to get to it, one screw is fastened securing the pump cover and it, together with the gaskets, is retracted.
Clean the strainer, only with compressed air. Any mechanical methods are strictly prohibited, since the mesh is very soft and easily changes shape. When you press it, it is easily crushed and bends form along the edge of the seat, through which non-filtered fuel can enter the carburetor.
In the process of cleaning, the seat with the filter installed in it must be half covered with a finger and only after that blow air, otherwise, the grid can fly away and find it will not work.
Depressurization of the carburetor and injector clogging.
Sometimes, when the carburetor cover fastening screws are loosened or the gaskets become unusable, a power loss can also be observed on the chainsaw, in order to eliminate the possibility of this failure, it is necessary to check the integrity of the gaskets and tighten the screws on the carburetor covers. To do this, remove it from the engine (the algorithm is described above) and disassemble. Defective gaskets must be replaced using spare parts from the Stihl MS 180 carburetor repair kit.
In the case where a complete check of the fuel supply and exhaust system is carried out, but there are no results. Check the main fuel injector valve. To check, you need to knock it out of the body of the carburetor.
All work should be carried out according to the following algorithm:
- The carburetor is removed from the chainsaw.
- The four screws fastening the cover with the compensator unscrew, after which the cover can be removed.
- The carburetor is installed on a wooden lining, after which with the help of a bolt with a diameter of no more than eight millimeters and a length of 50, it is knocked out into the internal cavity of the carburetor.
- Next, you need to pick up a small hose whose inner diameter corresponds to or slightly less than the outer diameter of the nozzle and put it on the nozzle.
- The next step is to blow the inside of the hose. If it is blown only in one direction, the nozzle is intact, if it does not bleed at all, or at all, then the valve must be replaced.
All the above steps should help in eliminating the problem associated with the fact that the chainsaw is not gaining momentum, otherwise, a full diagnosis in the service center of the manufacturer will help.
Why a chainsaw doesn’t slow down?
There can be several reasons why a chainsaw does not lose momentum:
- broken throttle spring;
- wedging gas trigger;
- bent throttle thrust;
- Lost the corkscrew of the throttle shaft, causing it to wedge.
Solve all these problems is easy, you need to conduct a thorough inspection and determine the exact cause, and then change the defective part. As a rule, if a chainsaw is gaining momentum, is idling and has normal power, then the problem is that it does not slow down, it is purely mechanical. And to find and eliminate a mechanical malfunction is much easier than determining and stopping air leaks in the crank case.
When the first signs of loss of power (reduction in speed) of the Stihl MS 180 chainsaw appear, in no case do you need to continue working, but you should immediately contact the specialists or carry out diagnostics and fix the fault yourself. The reasons for the loss of power is not so much and you can cope with them without even having certain skills. The main thing is to calmly analyze the behavior of the saw and find out the reasons why it stopped pulling (the speed dropped), and troubleshooting is already a simple matter.