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tthp design questions

Discussion in 'Lawn Mowing' started by dobehap, Nov 2, 2003.

  1. dobehap

    dobehap LawnSite Senior Member
    Messages: 292

    (4th attempt to post this, failed to post in ex-mark forums, would a kind moderator move this to an ex-mark forum?)

    Dear ExMark,

    I have few questions about my new 36" tthp.

    1. I have noticed a high pitch "dsing" on occasion when the machine is in usage.
    Upon closer examination, I figure the sound is comming from the pumps belt tentioner that on occasion comes in contact with the pulley. If you look at it from the side, the clearance between the tensioner and the pulley is very small. Is this a flaw in design, or is it normal? Or is this unique only to my machine?

    2. The manual blade engage lever. Lately I have noticed it to snap back (disengage the blades). I have checked the belt tension, and its withing the +/- 16th of the indicator, so its not that. The only thing that I have noticed is the shape of a rod that goes up to the lever, perhaps it need to be further bent for adequate leverage beyond the "center point" (if you know what I mean)

    3. Is there a "risk" of running the hydro pumps comletely open? What I mean by this is this: The machine was designed to use the pumps with set limits. I understand the limits are there due to ECS grips control, as well as good ballance between the forward and reverse speeds.
    What I want to know is- is there a risk of damaging the hydro pumps if I udjust the grips to go further down, allowing the pumps to go faster.
    I dont know if I made myself clear, but for instance- there is a very little play on how far down the pump moves when in reverse possition, because when you squese the handle- there is only so little space you have to squese and thats it. But if you manually move the pump in reverse, then you can see that it WILL go in reverse much faster.
    Just want to know if its safe. I want to increase the speed of my tthp.

    Overall, thanks for a great product.
  2. Floridalandcare

    Floridalandcare LawnSite Senior Member
    from Tampa
    Messages: 314

    This may or may not be your problem . We have a 48 metro that sometimes the the blade idler pulley bolt gets a little loose and the pulley rubs against the bar it is attached to . But this will only happen when the blades are engaged. Chris
  3. dobehap

    dobehap LawnSite Senior Member
    Messages: 292

    Mine happens with or without the blades engaged.
  4. Floridalandcare

    Floridalandcare LawnSite Senior Member
    from Tampa
    Messages: 314

    Did you check the Hydro pump tension pully ?
  5. 1MajorTom

    1MajorTom Former Moderator
    Messages: 6,073


    Your posts are there in the eXmark forum. They are just waiting to be released, and they will be soon.
    All manufactured sponsor forums are set up the same way.
    All posts go into a queue (a holding area) waiting to be released by the sponsor.
    It will show up soon.
  6. dobehap

    dobehap LawnSite Senior Member
    Messages: 292

    Thank you Jodi, I did not know.
  7. dobehap

    dobehap LawnSite Senior Member
    Messages: 292

    Hydro pump tension pully is operated by a spring, so it operates at spring strength, in other words - at one setting.

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