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Mower vibration when blades engaged

Discussion in 'Mechanic and Repair' started by Lorge, Jul 26, 2005.

  1. Lorge

    Lorge LawnSite Member
    Messages: 35

    On my Toro 44" walk behind 15hp kaw I get a vibration only when I engage the blades. It causes the whole piece the engine is resting on to wiggle up and down causing the engine to move up and down a little. I checked the motor mounts and they are as tight as can be. What could it be?
  2. hole in one lco

    hole in one lco LawnSite Bronze Member
    Messages: 1,793

    bad spindle or bent blade
  3. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    How About a flat spot on the belt or a bent pulley or a stick jammed in a pulley, Just need to take your time and check it out and you will find the problem.
  4. bob

    bob LawnSite Platinum Member
    from DE
    Messages: 4,261

    Tilt the mower back and grab the blade with two hands( hold the ends) . See if there,s any play in the spindle, by pushing and pulling on the blade , at the same time. It should be tight. If the bearings are shot, you'll feel the blade move too far.
  5. iluvscag

    iluvscag LawnSite Senior Member
    Messages: 743

    Bent blade bolt maybe. :)
  6. Lorge

    Lorge LawnSite Member
    Messages: 35

    Are there any bearings in the output shaft of the engine that could be worn? Or could it be something with the clutch?
  7. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    If you have performed all the above mentioned checks and havn't found anything wrong then I would remove the clutch and check it, If a bearing is bad it could let the pulley miss align and cause a vibration, You wouldn't want to think about a crank bearing, If this were the case you would have the vibration all the time.

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