How To Disassemble A Saw Stihl 180 Completely

Chainsaw Stihl MS 180 – a tool worthy of attention
Stihl MS 180 chainsaw device: technical specifications, malfunctions and repairs, do-it-yourself carburetor adjustment and much more on our website!

Stihl MC 180 chainsaw device – model components

The design of the Stihl MS 180 chainsaw is quite difficult to call simple – this is due to the peculiarities of the operation of this model. The Stihl 180 chainsaw device consists of the following components:

The manufacturer took into account the possibility of regular operation of the chainsaw at low temperatures, which resulted in the presence of a proprietary system for a smoother and faster engine start.

Chainsaw Stihl 180 – malfunctions and repairs

In the case of the Stihl MS 180 chainsaw, malfunctions and methods of their elimination may be different. In order to be able to independently repair the breakdowns of the Stihl MS 180 chainsaw, we will study the most common causes of breakdowns and methods of their elimination on our own.

Chainsaw does not start well – looking for reasons

If your saw won’t cold start, the first thing to do is inspect the tool pistons. The piston group of the Stihl MS 180 saw is highly reliable, however, due to a lack of engine oil or mechanical shock, an immediate piston replacement may be required. Before changing the piston, we advise you to study the specified algorithm:

  1. Remove the saw top cover and unscrew the candle;
  2. Remove the stoppers from the shock absorbers, the drive sprocket and the starter;
  3. Next, the flywheel, worm drive and victorious chain are removed;
  4. Then remove the ignition coil and muffler;
  5. At the end, the piston group of the chainsaw is dismantled.
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What happens when the primer is pumping fuel, and how does it help to start the saw more efficiently?

At the moment of starting the saw without a primer, several movements of the starter are carried out only so that the fuel pump, under the action of an impulse from the saw crankcase, pumps fuel into the carburetor.

how to disassemble a saw Stihl 180 completely

The pump installed in the fuel line allows you to manually pump gasoline into the carburetor without unnecessary movements with the starter. The effect of this action is obvious, the saw will start much faster.

There is no need to use a primer on a hot chainsaw, since there is enough fuel in the carburetor to start.

We start Stihl MS 180 C

The device of this model, in comparison with the previous one, has some differences in the trigger mechanism, but it does not carry any changes in the triggering algorithm. The fact is that the ErgoStart system is installed in the Stihl 180 C, which, due to an additional spring installed in the chainsaw starter, reduces the engine resistance when starting.

How to start a chainsaws with a decompression valve

Before starting a Stihl chainsaw on which a decompression valve is installed, you must turn it on. It should be noted that there is no decompression valve on the Stihl 250 saw.

After the first flash has passed, the valve will return to normal operation, so after the engine control lever is set to the choke open position and starting continues, the decompression valve must be pressed again.

The valve operation is schematically shown in the figure below.

In fact, the valve does not make starting faster, it just simplifies the process and makes it more comfortable, because for during the launch, a person will have to apply significantly less effort.

Removing the flywheel

The flywheel of the Stihl 180 chainsaw is twisted with great effort, therefore, to remove it, you need a head with a metal knob. The nut holding the flywheel is unscrewed by the head by 13.

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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 tied to 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 nut is ordinary, so you need to turn it to the left. Having 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 jumps off the shaft from a sharp impact and can be easily removed without the help of additional tools.

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 them, unscrew them, then carefully remove the engine from the seat and the rubber tube of the carburetor.

To disassemble the engine, 4 crankcase screws are unscrewed, and it is removed, then you can remove the crankshaft complete with oil seals, bearings and piston rings.

Removing bearings and oil seals usually does not require additional tools, but if the bearings were pressed onto the shaft with force, then a special puller will be required 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

Before disassembling the clutch, the drive sprocket must be removed. 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 bar, and not the back of the Stihl 180 saw.

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Having unscrewed and removed the clutch, you need to immediately remove the reflective plate and the oil pump drive, this is easy to do, since they are put on the shaft without any fastening.

Major malfunctions and ways to eliminate them

The operation of the tool must be carried out in accordance with the instructions attached to it. Include start button only after the chain tension, the presence of a fuel mixture and oil have been checked. Having securely fixed the chainsaw in your hands, you can get to work.

If the tool refuses to work, then first of all it is necessary to identify the cause of the malfunction. And the most common tools for repairing a chainsaw are suitable: various screwdrivers, socket and wrenches, hexagons.

Chain oil leaking

Sooner or later, every tool owner will face this problem. The cause of this malfunction is a leak at the junction of the oil pump and the hose from the oil tank.

To eliminate this problem, you will have to practically completely disassemble the chainsaw.

  1. If the hose is damaged, it is best to replace it with a new one. You can try to fill it with sealant, after degreasing and rinsing.
  2. Oil can leak if the saw oil filter is clogged or broken. It should be checked and cleaned or replaced.

Do-it-yourself repair of the Stihl 180 chainsaw: instruction

The Stihl 180 chainsaw has proven itself well in the construction market. This portable device has a power of 1400 W and a motor volume of 31 cc. Cm. The length of the saw chain is 350 mm, at idle speed it makes more than 2 thousand revolutions. Its popularity among consumers is also explained by the acceptable cost of the tool. However, when using a chainsaw, malfunctions occur from time to time. In the service, repairing a tool is not cheap, so those who understand at least a little technical issues fix breakdowns with their own hands.