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MS 170 Stihl chainsaw


Dixie2012's Avatar
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10-30-15, 04:08 PM   #1  
MS 170 Stihl chainsaw

Of course you'd know I borrowed my brothers chainsaw to cut up a tree that blew over in the back yard during the storm last weekend &....

This little Stihl MS 170 cut fine for a while, then I shut it off to move some limbs to the truck in the front yard. I came back to start it up & it would start but the chain wouldn't turn. I shut it off & I checked the chain & it had a little slack as it should. So I figured there was a wood chip or something jammed in there somehow. I took the side off where the chain is & the gear that turns the chain & it seems like the clutch (that the gear is on) is froze up. It could be that something in there broke or jammed. There is a half moon clip that holds the gear on. Is that the only thing holding the clutch on & if I attempt to remove it, will it all fly apart or will it just simply come apart so I can easily put it back together?

I did start it with the chain & bar of & I couldn't really tell for certain but it looks like the shaft through the clutch, that the gear & half moon clip is on, turns... but the gear doesn't. Again, the shaft (possibly) turns but the gear doesn't.

As well, any help or ideas on what might be the problem would help.

Thanks as always,
TC

 
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10-30-15, 05:07 PM   #2  
With the chain and bar off can you turn the gear by hand - saw not started?

 
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10-30-15, 05:17 PM   #3  
Well, its fixed... actually, it wasnt broke. There is a "safety bar" in front of where your hand holds the saw, in case the saw gets away from you its supposed to "lock the clutch" so it will stop the chain & not cut you as the saw flops around etc.

So, in the end, somehow, I guess when I set the saw down to move limbs, I bumped the safety bar & it locked up the clutch.

If it wasnt for helping you other guys understand what happened, I woulda just went & got under the bed. But, I have used chainsaws when I was a teenager for years because we burned wood heaters etc at home. I have used chainsaws on ocasion since but... this safety stuff

Anyway, I learned something & I hope yall did

 
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10-30-15, 05:25 PM   #4  
The chain brake keeps that thing off your nose when it bucks on you.

 
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10-30-15, 05:26 PM   #5  
Sounds like the chain brake is not releasing. The manual at the website below contains excellent exploded views that should allow you to fix a brake or any other problem. Good luck.

http://www.mediafire.com/view/wviabsnt39a4h2w

 
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10-31-15, 04:22 AM   #6  
With 16 acres and a wood stove I use chainsaws fairly frequently and couldn't count the times I've accidentally engaged the chain brake so don't beat yourself up too much


retired painter/contractor avid DIYer

 
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10-31-15, 04:36 AM   #7  
Thanks for everyone's help & support

 
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