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372 chain tension problem

Discussion in 'Chainsaw' started by ThackMan, Jan 8, 2019.

  1. ThackMan

    ThackMan ArboristSite Operative

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    Looking at it all it seems like a worn rim sprocket was causing the bottom of the chain’s drivers to wear along with the clutch spline. And I think cause my problem.


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  2. ThackMan

    ThackMan ArboristSite Operative

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    That’s what I thought too.


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  3. ThackMan

    ThackMan ArboristSite Operative

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    Will any brand of rim sprocket fit? 3/8 pitch of course.


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  4. vortec325

    vortec325 ArboristSite Operative

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    Yah I think it’s a safe bet the sprocket is worn . Might as well replace the bearing while your there


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  5. ThackMan

    ThackMan ArboristSite Operative

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    Drum too? Those dents shouldn’t hurt anything with a new sprocket. Right?


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  6. ThackMan

    ThackMan ArboristSite Operative

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    [​IMG]


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  7. 67L36Driver

    67L36Driver Tree Freak

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    [​IMG]
    Maybe just the camera distortion but that strap looks short (.325” ?).

    Just to be safe, run the entire loop with a gauge,
    [​IMG]
     
  8. vortec325

    vortec325 ArboristSite Operative

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    As long as the bearing surface is good it should be alright


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  9. ThackMan

    ThackMan ArboristSite Operative

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    Just distorted because I shrunk the picture.


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  10. HarleyT

    HarleyT Tree Freak

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    Lol!!!
     
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  11. HarleyT

    HarleyT Tree Freak

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    That is one rough lookin' old sprocket!!!!

    The big question is how long you ran your new chain on it, and how much damage you did.
     
  12. ThackMan

    ThackMan ArboristSite Operative

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    Hopefully not much.


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  13. HarleyT

    HarleyT Tree Freak

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    Sorry, I always ask for pics to tell the story...
     
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  14. ThackMan

    ThackMan ArboristSite Operative

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    Perfectly fine I just wasn’t sure how much wear was considered worn. It’s my first big saw. Nothing else I have had came with a rim sprocket. Kinda seems obvious now.


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  15. vortec325

    vortec325 ArboristSite Operative

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    [​IMG]
    this is how they look new



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  16. Mauser

    Mauser ArboristSite Operative

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    Yeah, I'd replace that sprocket NOW, even if there weren't any other problems.
     
  17. Mattyo

    Mattyo Youtube Speciawist

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    Here's another possibility

     
  18. ThackMan

    ThackMan ArboristSite Operative

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    That was my initial fear when I first noticed the problem. But I checked and the crank doesn’t seem to be bent.


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  19. ThackMan

    ThackMan ArboristSite Operative

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    Just ordered new rim sprocket. I think that’s gonna be the ticket.


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  20. Mattyo

    Mattyo Youtube Speciawist

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    Ok good...

    I don't see how a worn sprocket would do that unless it's really uneven. But hope it works just the same!
     

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