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Abnormal Trimmer Vibration

Discussion in 'Mechanic and Repair' started by procut, May 10, 2005.

  1. procut

    procut LawnSite Bronze Member
    Messages: 1,852

    My Stihl trimmer has developed some sort of a vibration problem. I can hardly hold onto it if it is running above 1/2 throttle because it vibrates so bad. I looked it over, and didn't see any obvious problems. Also, it was brand new mid summer last year, so it doesn't have a whole lot of use on it. Any suggestions?
  2. cariboulou

    cariboulou LawnSite Member
    Messages: 160

    has the shaft been bent at all? perhaps the cable inside is rubbing on the bent part of the shaft tube. Also, take off the cover to the bump head. Sometimes one side will get clogged with sand or dirt and cause a slight vibration with me. Il take off the cover in the field and clean it out a little and does it. i hope this helps.
  3. bugspit

    bugspit LawnSite Senior Member
    Messages: 767

    a unevenly wound trimmer head will cause this but, in light of your forum name I suspect...no ..I expect, you have checked this.
  4. tinman

    tinman LawnSite Bronze Member
    from ga
    Messages: 1,346

    mine did that 2 seasons ago.... shaft had been crimped slightly (no idea how)...that caused something else to go bad ..... $136 to fix :angry:
  5. dvmcmrhp52

    dvmcmrhp52 LawnSite Platinum Member
    from Pa.
    Messages: 4,205

    Driveshaft would be the first thing I'd check.
  6. fixer67

    fixer67 LawnSite Silver Member
    Messages: 2,098

    where is the vibration at? Down low or up high? I have seen the springs on the clutch break and unbalance it and cause a lot of vibration
  7. procut

    procut LawnSite Bronze Member
    Messages: 1,852

    Thanks for the replies. I checked the bump head and nothing seemed out of the ordinary. I'll look at the shaft/cable this afternoon.
  8. cariboulou

    cariboulou LawnSite Member
    Messages: 160

    You might feel the tube shaft gets hotter and may turn blue where the cable shaft rubs on the inside of the tube.
  9. sheshovel

    sheshovel LawnSite Fanatic
    Messages: 5,112

    shaft bent,something happened to it,was it crunched in a truck bed under something?,did you bang it on the ground real real hard,?Did you lend it to someone else or allow them to use it?
  10. joe stihl

    joe stihl LawnSite Member
    Messages: 35

    Grease the drive shaft, especially if it's a cable. Check the clutch springs. While you're there put some grease inside the clutch drum.

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