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  1. #1
    Silver Member
    Join Date
    Feb 2009
    Posts
    219
    Location
    south western michigan
    Tractor
    pt 425, JI Case, Gravely Comm.10A

    Default strange harmonics/vibrations

    well.... at 330 hours now I am pursuing an unusual vibration when accelerating motor to full throttle, never encountered this before. motor mounts are tight (first thing I checked) lovejoy couplers?

  2. #2
    Epic Contributor MossRoad's Avatar
    Join Date
    Aug 2001
    Posts
    22,514
    Location
    South Bend, Indiana (near)
    Tractor
    Power Trac PT425 2001 Model Year

    Default Re: strange harmonics/vibrations

    Does it only happen when the PTO is engaged and a mower deck is installed?
    MossRoad

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  3. #3
    Silver Member
    Join Date
    Feb 2009
    Posts
    219
    Location
    south western michigan
    Tractor
    pt 425, JI Case, Gravely Comm.10A

    Default Re: strange harmonics/vibrations

    no attachments are on the PT except for the pallet forks and the vibration occurs while parked

  4. #4
    Elite Member woodlandfarms's Avatar
    Join Date
    Jul 2006
    Posts
    3,908
    Location
    Los Angeles / SW Washington
    Tractor
    PowerTrac 1850

    Default Re: strange harmonics/vibrations

    So, if you were to relieve the pressure on the PTO Pump, put a coupler across it, does it change the vibration? I guess I am getting at is how you get to wether it is like on a car... if you feel the issue under acceleration it is engine or tranny, and if you feel it under coast it is the wheels. Wondering if you can free-wheel your pumps, and see if the vibration continues. I would assume, probably incorrectly, that a pump with no load would have less chance of vibration than one under load.
    Power-Trac 1850, grapple, hoe, 90" mower, 72" box blade

  5. #5
    Silver Member
    Join Date
    Feb 2009
    Posts
    219
    Location
    south western michigan
    Tractor
    pt 425, JI Case, Gravely Comm.10A

    Default Re: strange harmonics/vibrations

    my neighbor feels that the vibration is a transition problem between low idle circuit jets to high flow jets in the carburetor, if I have time this weekend the pumps will be disconnected from the motor and motor ran to check for harsh vibrations through rpm range, if problem surfaces it will warrant a carb. rebuild

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