STIHL ms 180 how to tension the chain

Chain direction and which side to wear

The chain saw chain, if you look closely, has the saw teeth pointing in one direction. Therefore, the correct direction of the saw teeth on the guide bar is very simple to determine: if you place the chainsaw itself in the plane in which it is at work, the row of teeth located on top of the guide bar, the sharp edges should be directed towards the end of the bar. While the row of teeth at the bottom of the chain saw should point in the opposite direction to the drive sprocket.

To put the chain with its teeth inside the grooves in the guide bar will not work, it simply will not stay on the bar. That’s why it is necessary to put the chain on the guide bar in such a way that the guide lugs of the saw blade links are turned to the guide bar.

How to shorten a chainsaw chain with your own hands?

If you use the bar for an extended period of time it can gradually become slack. Faced with this for the first time, many inexperienced chain saw operators don’t know what to do if the chain on their chainsaw is stretched. To solve the problem, the first thing you need to do is assess the level of slack. After that, you can proceed to the preparation of tools that will help shorten the chain on the chainsaw.

The subsequent order of action should look as follows:

    You will first need to carefully disconnect the links in the sagging part of the headset. Doing it with an angle grinder is tricky and dangerous. especially if you’re repairing a carbide-tipped diamond chain. The best way to detach the links is to use a hand file or an ordinary file. Grind each side of the chainring on its own when you do this. Then you need to turn out the worn rivets with the help of a prepared driftwood;

Quite often a special chain riveter is used instead of a workpiece and 2 hand files for work on shortening the chains at home. It allows you to connect the links faster and more accurately without the need for further processing with a file.

Repair the saw with your own hands

The lightweight and handy STIHL MC 180 chain saw replaces a two-handed saw, bow saw or even a hacksaw in the home. Over time, dull chains, worn sprockets, damaged oil supply system. Some of the problems you can fix yourself. Others need to be repaired in an authorized service center.

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You can check whether lubricant is in the oil reservoir and whether it is leaking onto the chain with a clean piece of paper. Hold the guide bar against a piece of paper and leave a distinctive oil film on the guide bar.

To do this yourself, you need to understand the components and the sequence of operations for removing and repairing or replacing them. The STIHL STIHL 180 chain saw instruction manual will be a reliable helper. It is in it that you can find the installation techniques and the sequence of operations for repair:

Or have the chain shortened and sharpened by a DIY mechanic.

If the saw chain remains dry or leaks oil during operation, the STIHL 180 chain saw lubrication system requires troubleshooting and repair. It is a good way of inspecting the oil pipes and the tightness of the connections to the fittings. Make sure to clean the filter in the oil supply. If there is minor mechanical damage to the hoses, the tightness can be restored with sealant.

The carburetor makes it difficult to start the saw, the running tool does not pick up speed, throttles when throttling. The cause may be a worn collar on the piston, resulting in air suction at low pressure. To repair the carburetor remove and get to the collar on the gas pedal by disassembling the assembly in the sequence:

  • Remove the cover with the diaphragm by unscrewing the screw;
  • remove the retaining ring;
  • disconnect air damper, remove throttle;
  • pull out the gas pedal with spring;
  • replace the tiny piston and collar and reassemble the carburetor in reverse order.

Malfunctions can be related to the ignition system. After checking the performance of the spark plugs and cleaning the fouling, adjust the carburetor, feed system and clean the injectors. The carburetor is a complex unit and its adjustment affects the operation of the chassis. If you are unsure and unskilled, you should use a specialist. Working with wrong gasoline or bad oil is often the root cause of all troubles.

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The following resources are here to help the mechanic: How to repair a STIHL STIHL 180 chain saw with your own hands, for example, a video to show the disassembly sequence.

To see how to diagnose the lubrication system please click here:

How to tension the chain on a STIHL chain saw

STIHL saws in your hands are not the right thing to be nervous about.к. The STIHL chain lubrication system is one of the most robust and best-quality models in the STIHL product range, and is made from components manufactured by one of the world’s leading companies.

Before you tighten the chain on your STIHL chain saw or check the tensioning, always wear protective gloves. This not only prevents your hands from getting cut by the sharp prongs, but also keeps them clean because machine oil is hard to clean and wash.

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First check the STIHL chain tension. If the chain is slack (some of the inner prongs are visible), it must be tightened. If it is loose, it will damage the bar and cause the saw to malfunction. If the chain is stationary when the brake is released, the chain is overtightened and must be loosened.

Tensioning mechanisms

Figure 2. Tensioning mechanisms Depending on the construction of the instrument, the headset tensioning mechanism may differ.

In the budget models of chainsaws for chain adjustment use a classic bolt with a straight thread, which is located on the side of the body.

This one comes with a special tensioning wrench or an external slot for a slotted screwdriver.

All professional models have more convenient adjustment mechanisms. They tighten the chain with one pull of the lever or by turning the special knob. their construction consists of an integrated tensioner, with a locking mechanism that is secured by a locknut when turning. Some models are adjusted by locking the bar in a certain position on the tool cover. Regardless of the method of tensioning, the chain must only be tensioned when it is cool. Hot chain tensioning causes slack as it cools.

Tensioning Mechanisms

The tensioning mechanism on the headset may differ, depending on the design of the tool.

In the budget models of chainsaws for chain adjustment use a classic bolt with a straight thread, which is located on the side of the body.

stihl, tension, chain

They are equipped with a special tensioning wrench or an external slot for a slotted screwdriver.

All professional models have a more convenient adjustment mechanism. They can be used to tighten the chain with a single pull of the lever or by turning a special disc. Their construction consists of an integrated tensioner, the locking when turning is achieved by a locknut. On some models, adjustment is made by locking the bar in a certain position on the tool cover. Regardless of the method, chain tension should only be corrected when the chain is cool. When the chain is hot, it causes slack in the chain when it cools down.

Chainsaw chain element replacement

If you need to replace the chain on your chainsaw, follow these steps.

  • Remove the sprocket cover. This is most often done by unscrewing the fastening nuts.
  • After unscrewing the fasteners, remove the cover that covers the sprocket clutch.
  • Grasp the bar with your hand and push it toward the sprocket to loosen the chain.
  • Remove the chain element from the drive sprocket.
  • Now install the chain on the chain saw. Take the new saw element and fit it to the drive sprocket first.
  • Then you need to put the chain on the bar, placing the element in its groove all around. It is important that the chain links are correctly mounted on the chain sprocket which is on top of the bar. Pay attention to the direction of the cutting links when installing. They must face the opposite direction from the machine, on top of the tire.
  • Feed the bar in the opposite direction to the engine to tighten the chain slightly.
  • After laying the saw element, before putting the cover back on, align the screw that adjusts the tension with the regulator behind the bar. Only then may the top cover be put on and the nuts slightly tightened. Then insert the screwdriver into the adjusting screw and make the final tensioning. As explained above, tighten the chain properly.
  • Pull the bar up slightly and then tighten the nuts so they are locked in place. It is important not to overdo it or tear the threads.
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Expert’s tip

New chains in the first hours of operation stretch more than the old ones. That’s why the tensioning should be checked after the first 12 to 20 minutes. work.

Over tensioning will overload the engine with a loss of power and wear out the cutting attachments and chainsaw parts, especially the drive and clutch sprocket.

After 3 or 4 chainrings have worn out the bar should be replaced with a new one.

STIHL MS 180 C-BE chainsaw: Mounting the bar and chain, tensioning the saw chain

After 6 to 8 chains and 2 tires are worn, you need to evaluate the condition of the drive sprocket. On different models, they wear out after different lifespans. Sprocket teeth that have worn out have a different size. Even if the chain doesn’t slip on them, it can reduce its life span.

It is recommended to lubricate sprocket at the end of the bar after each tensioning adjustment. There are holes near the sprocket for this purpose. The oil from the pump gets there on a residual basis, and sometimes not at all. That is why you should have an oil can on hand together with a wrench and screwdriver for tensioning. 3 to 4 drops of oil are enough for greasing.

Insufficient lubrication speeds up wear of cutting equipment and chain stretching. Scheduled oil consumption varies from chainsaw to chainsaw. On some models, 1 jar of oil is used almost at the same time as 1 jar of gasoline. Others have enough oil for 2 gasoline pumps. A sign of good lubrication is an oily sheen on the chain and a smooth running of the chain in the groove.

stihl, tension, chain

Low-quality chains should not be used. They stretch quickly, damage the parts in contact with them, and require more frequent tightening.

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