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My stihl ms-180-c chain saw will not keep chain tight. you tighten chain rev. engine chain will just about come okk -tighten chain rev. engine same thing.

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You have to use the tension screw to move the cutter bar to tighten the chain then you do up the bar mounting nut to keep it tight

Posted on May 12, 2017


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Posted on Jan 02, 2017


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I have a Stihl MS 290, runs great, but the chain keeps tightening it's self on it's own

That's an unusual problem, usually the opposite happens. After making sure the chain brake is off, loosen the two nuts that hold the bar. Be sure to hold the bar up when adjusting the tensioner screw and adjust until the chain is just snug, but not too tight. While still holding the bar up, tighten the two nuts firmly. Check to see that the chain can move freely by hand. Then start the saw and run the chain at speed with something in front of the nose to check for adequate lubrication. You should note a slight fine spray of oil on the object in front of the nose of the bar. Inadequate lubrication, a chain that is binding on the bar, or an overly tight chain can cause the bar to heat up and expand, further tightening the chain. A properly adjusted Stihl saw will use almost all of the chain oil in the reservoir for every tank of gas. Too much oil is better than too little. The oil feed may have to be adjusted for operating in temperature extremes. If operating in very hot conditions, be sure that the saw has not run out of chain oil. The oil feeds faster when hot.

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Download manual at:
Go to page 26. Remember to pull front of chain bar up before you tighten nuts. Make sure you really tighten nuts so they do not allow bar to move when finished.

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1 Answer

Chaisaw wont keep consistant tension. 1st it goes really tight then after retension it goes really slack. any ideas?

Most chain tention issues are due to inadiqate oil to the bar and chain, or the wrong type of oil, there may also be issues if this is a tooless system to lock the bar.

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1 Answer

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You're not tightening the nut tight enough.

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I have a Stihl 16" 012 AVT chainsaw. I cannot get

First thing I would try is wash out the oil tank with a little bit of diesel fuel then run some thinner oil thru it to see if it gets better . I usually leave bar and chain off when I do this.. or if it is oiling but not going down the bar check the bar oil holes.

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1 Answer

New Stihl ms 180 idles but will not accelerate

sounds like you may have a broken throttle cable. take the top cover off and inspect to see if this is the problem. let me know if this is it or if you need more assistance with this.

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