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Intermittant hesitation - 48"belt drive

Discussion in 'Lawn Mowing' started by thefed, May 1, 2007.

  1. thefed

    thefed LawnSite Senior Member
    from Ohio
    Messages: 350

    I have a bobcat wb with maybe 50 hrs on it. When walking behind the mower, it somewhat regularly (every 6 or 7 seconds)hesitates, or stops moving forward for about .3 seconds. Its not enough to affect productivity, and is less noticeable or maybe gone at higher ground speeds.

    The brake handles on both sides actually pulsate a bit each time this happens...like someone is forcing the brakes closed for a split second..

    Any ideas?
  2. CFB

    CFB LawnSite Senior Member
    Messages: 515

    It has nothing to do with the breaks. PTO Belt slipping, or transmission problem maybe?
  3. txgrassguy

    txgrassguy LawnSite Gold Member
    Messages: 3,083

    The shifting fork requires adjustment.
    What happens is that the vibration of the mower bumping along the ground is making the transmission level oscillate back and forth which causes the pulsing you are referring too.
    Check to make sure the transmission in fully engaged in the gear selected.
    This problem is magnified if a sulkie is mounted to the mower.
    If a belt was slipping the pulsing would be much less pronounced, more like a gradual slow down than a hesitation then engagement.
  4. thefed

    thefed LawnSite Senior Member
    from Ohio
    Messages: 350

    wtf is the shifting fork? ive never maintained my own machines til recently, so bear with me. the trans is fully engaged each time this happens... so that isnt it

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