Chainsaw clutch replacement and repair
Chainsaw clutch malfunctions are one of the most common failures of this technique. The question of how to remove the clutch on a chainsaw at home correctly and NOT harm the tool is thought not only by inexperienced technicians, but also by specialists who have repaired it more than once. This is due to the fact that the clutch is an important key element of chainsaws of any power class and brand, on which their serviceable, long-term and successful operation depends.
In cases where gasoline cutters start to start poorly, slip instead of starting, checking the clutch for faults is mandatory, recommendations for which will be presented further.
How to remove the clutch from a chainsaw and put it back in place?
Diagram of the process of removing the clutch from a chainsaw (for example, let’s take a situation when a drum needs to be replaced):
- Remove the headset with a universal key;
- Remove the chain, tire;
- Unscrew the air filter cover;
- Then we twist the candle;
- We fix the piston with a stopper or rope;
- Remove the clutch with a punch (puller) or a universal wrench to remove the clutch;
- Remove the clutch by unscrewing it clockwise;
- Remove and replace the drum.
After the steps described above, the entire assembly is carried out in the reverse order.
How to remove the clutch on a chainsaw. Clutch device
A chainsaw for a business man is an indispensable tool, which comes to the rescue when performing logging work of various volumes, implementing construction projects from a bar, landscaping private estates, a garden, a yard, on a farm.
The power unit consists of several fundamental units, including the clutch. Often, the tool can malfunction due to a faulty chainsaw clutch. This is a typical breakdown that owners of a chainsaw face, regardless of its class, power, model and manufacturer. To repair the clutch, or at least accurately diagnose the cause of a breakdown, operators need to know how to Unscrew the clutch on a chainsaw. This knowledge will allow not only carrying out the Forced repair work, but also routine cleaning, inspection for preventive purposes. Remember that clutch performance and clutch performance affect long and efficient tool performance.
Reasons why you need to disassemble the clutch:
- Defective or broken spring;
- As a result of loads on the chainsaw and wear of parts, the spring has left its place;
- Chips on the clutch plate;
- Wear of parts.
Removing the flywheel
The flywheel of the Stihl 180 chainsaw is twisted with great effort, therefore, to remove it, you will need a head with a metal knob. The nut holding the flywheel is unscrewed by the head by 13.
To block the crankshaft from turning, you need to Unscrew the spark plug and install the piston stopper through the spark plug hole, if it is not there, you can use the old starter cord, with knots imposed on it and immersed in the cylinder through the spark plug hole.
It is strictly forbidden to keep the flywheel from turning by installing a power screwdriver and other tools between its ribs and the body of a power screwdriver, with this method of blocking from turning, the flywheel blades are NOT able to withstand the load and break off.
After the piston is locked in the cylinder, you can unscrew the flywheel nut. The thread in the nuts is common, so you need to turn it to the left. I loosened the nut, it is not necessary to remove it to the end, it is enough to Unscrew it until its upper edge is equal to the tip of the shaft, after which a soft metal drift is installed on the nut and a sharp blow is made on it. Thus, the flywheel from a sharp impact jumps off the shaft and can be easily removed without the help of additional tools.
Clutch Mechanism Repair. Spring Replacement
DO NOT rush to change the entire mechanism, as the clutch malfunction can be eliminated by replacing the defective part. The most common prerequisite for a malfunction is a spring that stretches and can be damaged. An already stretched spring is faulty. If the spring is damaged, it can be replaced to restore the functionality of the tool. Replacement instructions depend on the design of the mechanism, as compression devices are of different types, but all of them must be replaced. This procedure is NOT so complicated as requiring special care and adherence to the sequence of actions. How to replace the spring on the chainsaw coupling is shown in detail in the.
If the friction lining is damaged, this part can also be replaced. Replacement of the part is also necessary in case of wear of the threaded connection, which happens with frequent removal and installation of the coupling in place. To understand the cause of the part’s malfunction, you will need to first make a visual inspection. If the sprocket teeth are worn out, then it should be replaced. Fixed sprockets must be replaced with the drum.
Nuances when installing the clutch system:
- On some chainsaw models, there may be a washer between the drive sprocket and the clutch. Pay attention to which side it faces to the engine;
- Some oil pump drives are equipped with a special spring (whisker), which is responsible for transmitting rotary motion from the drive sprocket to the oil pump. It is important to adjust the spring so that its free end (whisker) falls into the corresponding groove on the sprocket housing. Otherwise the saw head will not be lubricated;
Important: after dismantling and assembling the clutch, be sure to check the operation of the automatic oil supply system.
The design and principle of operation of the chainsaw clutch mechanism
Most Sawers DO NOT understand how a chainsaw clutch works. When working, it is not necessary to know the principle of operation, but when malfunctions occur, in order to eliminate them, you will need to find out the design and features of the chainsaw clutch.
Modern chainsaws are equipped with centrifugal clutch mechanisms. Centrifugal clutch. This means that its performance depends on the torque of the engine. The main purpose of the clutch on a chainsaw is to ensure the transfer of torque from the engine crankshaft to the watch headset (chain). The device works in automatic mode, and how it happens, Let’s find out in detail.
The clutch mechanism consists of the following structural elements:
- Drum with removable or non-removable sprocket. is a transmission mechanism
- Friction linings. move under the influence of centrifugal force, engaging with the drum
- Spring. secures the pads against the crankshaft
Now, in principle, the operation of the chainsaw clutch. When the tool’s two-stroke engine starts up, the crankshaft starts rotating. A coupling is attached to the shaft, to which the chain is connected using an asterisk. When the chainsaw is idling (shaft rotation speed up to 2700 rpm), that is, the accelerator trigger is NOT pressed, the spring presses the friction pads, as a result of which torque is NOT transmitted to the drum.
As soon as the sawfly picks up the tool and begins to increase the speed (maximum up to 14000 rpm), the chain begins to move along the tire. This happens due to the fact that the speed of rotation of the crankshaft increases. Due to the inertia force, the friction pads (also called the counterweight) move and engage with the inner walls of the drum. As a result, the drum moves, which is connected to the sprocket. The rotating sprocket drives the chain.
The principle of operation of the mechanism is simple, due to its NOT complex design. If this part fails, then the chainsaw will work accordingly. A detailed description of the principle of operation of the chainsaw clutch mechanism is described in this material.
Carburetor, muffler and ignition coil
To remove the carburetor, you must have a head 8 and an extension, with which it is convenient to unscrew the nuts securing the carburetor and air filter. Before dismantling the carburetor, it is necessary to disconnect the ignition wire and the choke rod from the engine control lever and remove the lever, only after that the air filter and carburetor are removed.
The Stihl 180 muffler is fastened with two nuts, by unscrewing which you need to pull it towards you, it can be easily removed.
The coil is mounted on two screws, to remove you just need to unscrew them.
Preparatory stage
The repair of any equipment should begin with the preparatory work, and the Stihl 180 saw is not an exception. At the preparatory stage, before the Stihl 180 chainsaw is disassembled, it is necessary to remove the side cover, chain and tire from the chainsaw. Further, with the help of a compressor and a brush, you need to clean the chainsaw from dirt, sawdust, oil drips and other.
In places with a large accumulation of oil, can be washed with clean gasoline.
Removing and disassembling the engine
The engine is held in place by 4 screws installed on the bottom of the Stihl 180 chainsaw. To remove, unscrew them, then carefully remove the engine from the seat and the rubber pipe of the carburetor.
To disassemble the engine, 4 crankcase screws are unscrewed, and it is removed, then you can remove the crankshaft assembly with oil seals, bearings and piston rings.
Removing bearings and seals usually does not require additional tools, but if the bearings were pressed onto the shaft with force, then a special puller will be needed for dismantling.
To remove the piston from the connecting rod, you will need to remove the retaining ring from the seat using a thin screwdriver, then the piston pin is squeezed out from the opposite side, after which the piston is retracted to the side.
Dismantling the clutch and oil pump drive
Remove the drive sprocket before disassembling the clutch. To do this, carefully remove the lock washer from the grooves on the shaft and remove the sprocket and needle bearing.
With a high head 19, it is necessary to Unscrew the clutch. The thread on it is left-handed, so it unscrews towards the tire, and not the back of the Stihl 180 saw.
Having untwisted and removed the clutch, you need to immediately remove the reflective plate and the oil pump drive, this is easy to do, because they are put on the shaft without any fastening.
Removing the starter
At the next stage, the upper housing cover is removed and the 4 starter mounting screws are loosened, after which it is necessary to remove the oil tank and fuel barrel covers. The starter can be removed quite simply and problems should not arise.
After removing the starter, the opened inner cavity of the chainsaw must be cleaned, because usually there is a large amount of compressed small sawdust on the body under the starter.
Disassembly and assembly of Stihl МС 180
Stihl MS 180 is a reliable and unpretentious tool, but sometimes it requires repair, like any technique. In this article, we will consider how the Stihl MS 180 chainsaw is disassembled, which is necessary in the event of an engine overhaul.
Removing the flywheel
The flywheel of the Stihl 180 chainsaw is twisted with great effort, therefore, to remove it, you will need a head with a metal knob. The nut holding the flywheel is unscrewed by the head by 13.
To block the crankshaft from turning, you need to Unscrew the spark plug and install the piston stopper through the spark plug hole, if it is not there, you can use the old starter cord, with knots imposed on it and immersed in the cylinder through the spark plug hole.
After the piston is locked in the cylinder, you can unscrew the flywheel nut. The thread in the nuts is common, so you need to turn it to the left. I loosened the nut, it is not necessary to remove it to the end, it is enough to Unscrew it until its upper edge is equal to the tip of the shaft, after which a soft metal drift is installed on the nut and a sharp blow is made on it. Thus, the flywheel from a sharp impact jumps off the shaft and can be easily removed without the help of additional tools.
Carburetor, muffler and ignition coil
To remove the carburetor, you must have a head 8 and an extension, with which it is convenient to unscrew the nuts securing the carburetor and air filter. Before dismantling the carburetor, it is necessary to disconnect the ignition wire and the choke rod from the engine control lever and remove the lever, only after that the air filter and carburetor are removed.
The Stihl 180 muffler is fastened with two nuts, by unscrewing which you need to pull it towards you, it can be easily removed.
The coil is mounted on two screws, to remove you just need to unscrew them.
Removing the handle
Direct disassembly of the Stihl 180 begins with the removal of the handle, which is attached to the body of the chainsaw using three rubber shock absorbers. To remove, it is necessary to remove the plastic plugs from the inner cavity of the shock absorbers, then, using a powerful screwdriver, Squeeze out first the upper shock absorber, then the one closer to the rear handle.
When the handle remains on one of the shock absorbers, it is necessary to Unscrew the body of the chainsaw from the inside of the handle and twist it to the side, remove the body from the last rubber band.
Assembling the Stihl 180 chainsaw
Collecting stihl ms 180 dust back is quite simple, the main thing is to adhere to the following algorithm:
- Install the piston on the connecting rod, the arrow on the piston should point in the direction of the Stihl 180 chainsaw, and the side of the crankshaft, which is intended for installing the flywheel, is located to the left of the piston;
- Carefully insert the piston back into the cylinder, the place for mounting the coil should be on the side where the flywheel is installed on the crankshaft;
- Install the bearings, oil seals, circlip on the shaft and lower the entire assembly into the seat in the cylinder;
- Next, degrease the crankcase installation site and the crankcase itself, then grease with sealant and install in place, tighten 4 fastening screws;
To collect the Stihl 180 dust after the engine is assembled, the reverse sequence of disassembly must be followed. It is important to treat the process carefully and do not forget to install the rods on the carburetor, and connect the ignition wire.
Below you can see the disassembly of the Stihl 180 in. It is made for inexperienced users, it shows the whole process in detail.
Dismantling the Stihl 180 chainsaw and assembling it, if you have a certain experience, is quite simple, the main thing is to thoroughly clean the dust before work and DO NOT rush. In order that small parts are not lost, you need to use containers, in which, in the process, it is worth laying out spare parts.