Modern chainsaws are characterized by rather complex structures and simple operation. Regardless of the features of the tool, it is not immune from breakage. Almost any malfunction can be avoided if you properly care for and use the equipment.
Problems that the operator may encounter when working with a petrol tool:
- Not gaining momentum;
- Idling does not hold;
- Turnovers are not thrown off;
- Turnovers are collected by themselves.
In some cases, it is worth using the services of a specialist from a service center. But these problems can be fixed by hand.
Why is the chainsaw not gaining momentum?
When starting a gas tool, almost all systems and components are involved. When starting, there may be problems with revolutions, they can be provoked by the following reasons:
- Engine malfunction due to the development of a motor resource, wear or deformation of the piston rings and cylinder;
- Problems with the coil or spark plug - there is no spark to ignite the fuel mixtures;
- The carburetor screws are out of balance.
To test the ignition module, the following steps are performed:
- The candle is twisted;
- Her condition is being assessed. It is impossible that it was flooded with gasoline or there was a black coating;
- The distance between the coil and the magnets is checked (up to 0.2 millimeters);
- In addition, the candle block can be checked for spark supply by a working network drive.
If the chainsaw still does not develop speed, it is worth testing the carburetor. Low and high speeds are set by default, they are reset after the break-in process and a short use of the tool.
Turnovers are adjusted by screws, they are unscrewed to the stop. In this situation, it is necessary to reconfigure the jet H, which is responsible for the use of the unit under load. The supply of the fuel mixture is regulated while the engine is running at the highest speed of the circuit. The tachometer and instructions from src=”https://tehnika4sad.ru/wp-content/uploads/2018/09/nastrojka-karbyuratora-benzopily.png” class=”aligncenter” width=”554″ height=”330 ″[/img]
Chainsaw not developing full power
Content
Do-it-yourself chainsaw repair
All chainsaw malfunctions can be divided into two main groups: engine problems with all its components and systems (ignition, fuel supply system, cylinder-piston group, exhaust system) and malfunctions of other components (chain brake, lubrication system, clutch, tire, etc. .).
Engine malfunctions
- the engine does not start;
- starts, but stalls;
- works unstable;
- does not develop power, i.e. Runs fine at idle, but stalls under load.
When repairing a chainsaw with your own hands, it is necessary to act by way of exclusion. alternately inspect all possible causes of a malfunction, starting with those whose verification and elimination takes the least time (see here about the design and operation of a two-stroke motor).
Ignition system
. I don’t have a chainsaw, as gas develops revs of 6-8 thousand on a Husqvarna 240 chainsaw. Almost all types of engine problems listed above can be caused by ignition system failures. Therefore, when they occur, it makes sense to start troubleshooting with a candle. This is all the more justified since the state of the latter can provide useful information about the operation of the fuel system. So, if a problem occurs, you need to unscrew the candle and inspect it.
The wire is disconnected, and the candle is unscrewed with a special key.
If the plug is dry, it means that the problem is most likely not in the ignition system, but in the fuel mixture not entering the cylinder. You can wrap the candle back and take on the fuel system. If the spark plug is heavily splattered with the fuel mixture, then there is an excess of it. This may be due to misalignment of the carburetor or a violation of the rules for starting. The candle is wiped and dried, the cylinder is drained by cutting off the fuel supply and working as a starter. to ventilate the combustion chamber and remove excess fuel. Then install the candle in place and repeat the start.
The presence of a large amount of black soot also indicates malfunctions in the fuel system.
The ratio between oil and gasoline in the mixture may be violated, the carburetor is not adjusted, or low-quality oil is used. The candle is washed in gasoline, cleaned with a needle or awl from soot, the electrodes are cleaned with fine sandpaper and put in place.
In all these cases, it will not be superfluous to check the gap between the spark plug electrodes. Depending on its brand, it should be in the range of 0.5-0.65 mm. You also need to check the sealing gasket of the spark plug. The Stihl ms 180 chainsaw does not develop full power if the engine does not develop full power. If it is worn or damaged, the tightness of the combustion chamber may not be ensured, which leads to a decrease in compression in the cylinder and problems in the engine.
Even if, in the case of a spark plug test, there is good reason to believe that the malfunction is in the fuel system, you need to check the spark plug for a spark. At least to be sure that everything is in order with this. For this:
- put the ignition cable on the spark plug;
- using pliers with insulated handles, apply the thread or nut of the candle to the cylinder;
- pull the starter handle and look. there is a spark or it is not.
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If there is no spark, just replace the spark plug. If the new candle does not have a spark, you need to check the condition of the high-voltage wire for a break and contact with the candle.
The reason for the lack of a spark may also be a faulty ignition module or a violation of the gap between it and the flywheel magnetic circuit. It should be 0.2 mm. Violation of the gap becomes especially likely if the saw was disassembled with the removal of the flywheel and the ignition module before that. The gap is set using a 0.2 mm thick gasket placed between the flywheel boss and the ignition module. A defective ignition module must be replaced.
After checking the ignition system in this way and not finding a malfunction, you can proceed to the fuel mixture supply system.
Fuel supply system
. If by inspection of the spark plug it was found that fuel was not entering the cylinder, all possible reasons for this should be considered. It could be:
- non-flow of fuel from the tank due to a clogged hole in its cover (breather), while a vacuum is created in the tank that prevents fuel from flowing out;
- contamination of the fuel filter installed in the tank;
- no or insufficient flow of the fuel mixture from the carburetor into the cylinder.
To diagnose the first two reasons, it is enough to disconnect the fuel hose from the carburetor and see if fuel flows out of it or not. If it flows with a full jet, the breather and filter can not be checked, if it does not flow or flows weakly, we can assume that the cause of the malfunction has been found. Why the chainsaw does not take off or develop momentum: an overview of the reasons and do-it-yourself repairs. Check out our Troubleshooting Tips! The breather is cleaned with a needle. The fuel filter is removed through the filler hole of the empty fuel tank, with a wire hook, together with the suction hose, from which the filter is disconnected and cleaned or replaced with a new one. Chainsaw manufacturers recommend changing the fuel filter every 3 months.
The saw does not develop speed, does not develop power.
Why does such a problem appear that the saw seems to work fine, but suddenly the power
and
not
unravel.
Why the chainsaw does not gain power
The video shows some of the simplest reasons why a chainsaw does not
is gaining momentum, a video about other reasons.
Insufficient flow of the fuel mixture from the carburetor into the cylinder or a violation of the correct ratio between the fuel and air mixed in the carburetor can occur for several reasons: due to clogging of the air filter, unadjusted carburetor, clogging of its channels or mesh filter.
As a rule, chainsaw repair is not complete without cleaning the air filter, since it gets dirty pretty quickly. When this happens, the air supply to the carburetor is reduced, the fuel mixture at the outlet of the carburetor is too rich, which disrupts the normal operation of the engine. Carefully remove the dirty filter for cleaning so that dirt from it does not get into the carburetor. The filter should be cleaned or washed in water with some detergent, dried and reinstalled.
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The misalignment of the carburetor is eliminated by its adjustment. This is usually done with three screws. maximum and minimum speed and idle screw. Adjustment must be carried out in strict accordance with the instructions, non-compliance with which can lead to engine damage. Some saw manufacturers leave only one adjustment screw (idle). to exclude unwanted interference by inexperienced users in the operation of the carburetor. For an example of adjusting the carburetor of a chainsaw, see the article Working with a chainsaw.
If adjusting the carburetor did not help, you need to clean its channels and filter mesh, and at the same time check the integrity of the membrane. Carburetor. one of the most complex chainsaw devices, so you need to start disassembling and cleaning it with a full understanding of the responsibility of this operation. It consists of many small parts that have the peculiarity of imperceptibly jumping out of their places and irretrievably lost, so that, having disassembled this capricious device, you can not assemble it.
Below is a diagram of another chainsaw carburetor.
If there is no experience and self-confidence, it is better to entrust the repair of the chainsaw carburetor to a service center specialist. Sometimes, for high-quality cleaning of the carburetor, it is necessary to use ultrasonic cleaning.
Muffler
. Often the cause of engine failure, especially when the engine runs normally at low speeds and stalls under load, is clogging of the muffler spark arrester with combustion products, which prevents normal exhaust. Repair in this case consists in removing the muffler, disassembling (if it is collapsible) and wet cleaning it from carbon deposits using detergents. The non-separable muffler is dried with a hairdryer after washing. Remember that soot contains substances that are carcinogens, and dry cleaning, as a result of which their inhalation is possible, is unacceptable. When removing the muffler, plug the engine outlet with a clean rag.
One of the reasons why a muffler can become clogged. this is the use of a fuel mixture with an excess amount of oil (the amount of oil is more than recommended by the manufacturer), and the use of either oil not intended for two-stroke engines or low-quality oil.
Cylinder-piston group
. Malfunctions of the cylinder-piston group are among the most serious. This is the wear of the cylinder and piston, scratches and scuffs on their surface, wear or sinking in the grooves of the piston rings, wear of the crankshaft bearings. Most of these faults result in a drop in cylinder pressure and, as a result, the engine cannot be started or is unable to deliver full power. There are several ways to assess the condition of the cylinder-piston group (CPG).
You can remove the muffler and look through the window that opens, in which part of the side surface of the cylinder is visible. Chainsaw: does not develop power, or its inability to deliver full power. Despite the limited nature of the review, it is still possible to obtain a general idea of the state of the CPG in this way.
It is useful to measure the compression in the engine, which is quite informative regarding the condition of the CPG parts. The operation is carried out using a compression gauge installed in the spark plug hole.
The crankshaft is rotated using an electric motor (drill) with a flexible shaft or manually by a starter, while controlling the pressure on the pressure gauge. The latter for a working chainsaw should be at least 8-9 atm (0.8-0.9 MPa). With its decrease, the engine power also decreases. If the chainsaw does not develop full power, fuel consumption has increased significantly. At a pressure of 5 atm, the engine may work, and will, but only at idle.
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It is possible to accurately assess the condition of the CPG only by completely disassembling the engine. disconnecting the crankcase from the cylinder and removing the piston. If the latter has scuffs, chips or deep scratches, it must be changed. With regard to the cylinder, when the surface is worn out or damaged, it is possible to bore it to the repair size. The cause of low compression may be wear or coking of the piston ring. A serviceable ring should be clean from carbon deposits, sit freely in the piston groove and tightly pressed against the inner surface of the cylinder.
Chain lubrication system
With a significant (small is considered normal) oil leakage, it is necessary to check the tightness of the connection of the pipes to the pump fittings. They may fall off or crack. Violation of the tightness of the oil pipeline, in addition to drips, can also lead to insufficient chain lubrication. The pump begins to suck in air, which affects its performance. Violation of the tightness is eliminated by replacing the tubes or sealing them with sealant.
The most serious failure of the lubrication system are cracks in the oil pump housing. In this case, it will have to be replaced.
chain brake
Replacement of wearing parts
If you do not replace wearing parts on time, their excessive wear will adversely affect the rest of the chainsaw. For summer residents, a chainsaw each device weighs not the engine develops power 2. In particular, if the tire and drive sprocket are not changed in time, increased vibration will adversely affect the crankshaft bearings. The limiting depth of the sprocket teeth should be 0.5 mm. In practice, sprockets are often operated to a wear depth of 1 mm or more. not suspecting that this leads to an increased load on the crankshaft bearings and their accelerated failure. When 3-4 chains are worn out, it is necessary to change the tire itself, by this time its wear reaches the limit values.
The chainsaw tire wears especially hard in the area that is cut most often, usually. this is the underside of the guide bar. For even wear, each time the chain is replaced, the bar must be turned 180° about the horizontal axis.
When installing a new chain, a new drive sprocket should be installed. Since the life of the drive sprocket is twice the life of the chain under normal load, it is advisable to use one sprocket to alternate between two chains. Due to this, the sprocket and chains wear out almost simultaneously. If a new chain is put on a worn sprocket, then the drive links of the chain wear out much faster. The reasons why the chainsaw starts and immediately stalls, does not develop speed and does not produce maximum power, and their elimination. For profitable operation of the chainsaw, always use together: one guide bar, two chain sprockets, four saw chains.
Source
Chainsaw won't idle
The problem is quite common. The most common causes that lead to stalling at start-up and scrolling the chain:
- The air and fuel filters are clogged;
- Low-quality fuel is used or the fuel mixture is incorrectly prepared;
- Problems with the ignition module;
- The settings of the carburetor block do not correspond to the load level;
- Deformation or rusting of motor units.
Action algorithm:
- The fuel hose is thoroughly washed or replaced;
- The air filter is cleaned of all contaminants. The reusability of filters allows them to be removed and cleaned with detergents;
- Fuel and oil are checked for quality. It is better to use the mixtures indicated by the manufacturer in the instructions;
- The carburetor block and candles are tested.
Often the problem is only with one detail. After its elimination, the unit can be actively operated again.
Chainsaw does not slow down
In some cases, the gas tool quickly reaches a certain power level and does not slow down. To eliminate it, it is not enough to adjust the screws on the body or clean the carburetor. The essence of the problem is the high consumption of the fuel mixture.
The following actions are performed:
- The serviceability of the gas cable is checked;
- The return spring is inspected - it can jump off;
- The rear flap must be completely sealed.
The chainsaw picks up speed on its own
A problem may arise when the saw itself begins to gain momentum. While working, the unit stalls, not allowing the full use of the chainsaw.
Factors that can cause the unit to fail:
- Carburetor, fuel or air filters clogged;
- Fuel step damaged or clogged;
- The leading pipe between the carburetor block and the engine cylinder was depressurized;
- A problem with the settings of the screw (often H-screw) of the carburetor.
The following work is being carried out:
- The carburetor and filters are cleaned. This controls the correct setting of screws L and H.;
- The fuel filter should not be removed, as this will adversely affect the life of the tool. It is enough to check if it is ignited, the fuel supply hose should not be bent.
Problems with the working speed of a chainsaw can arise in any situation. Therefore, it is important to carefully treat the gas tool, carry out maintenance and diagnostics on time. Correct and timely work will allow you to quickly restore the working functions of the saw.
Conclusion
When the first signs of power loss (reduction in speed) appear with the Stihl MS 180 chainsaw, in no case should you continue to work, but you should immediately contact a specialist or diagnose and fix the problem yourself. There are not so many reasons for power loss and you can cope with them even without certain skills. The main thing is to calmly analyze the behavior of the saw and find out the reasons why it stopped pulling (speed dropped), and fixing the problem is already a simple matter.
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