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Speeding up the hydros on a ???

Discussion in 'Lawn Mowing' started by farrsfastfords, Mar 21, 2009.

  1. farrsfastfords

    farrsfastfords LawnSite Member
    Messages: 4

    Any of you guys had any experience with speeding up the ground speed on a hydro? I need fast transport speed for a recent account I obtained.

    Any help is appreciated.:cool2:

    JKOOPERS LawnSite Bronze Member
    Messages: 1,259

    yeah but if you speed it up you will lose reverse
  3. farrsfastfords

    farrsfastfords LawnSite Member
    Messages: 4

    no, i'm talking about bigger pumps/rebuilding the pumps etc.
  4. bohiaa

    bohiaa LawnSite Fanatic
    Messages: 5,220

    why would a person want to do this ?
  5. tyler_mott85

    tyler_mott85 LawnSite Senior Member
    Messages: 582

    Two ways to speed up a mower without changing out pumps.

    Increase engine speed = which increases the speed at which the pump turns

    Change out pulleys on pumps = increases the number of rotations the pump turns per rotation of the engine.

    Either one has its pros and cons. On walkers the way you increase speed is by the whole pulley method but when you do that the entire hydro system becomes very touchy.

    Increasing engine RPM is hard on the engine.
  6. MikeKle

    MikeKle LawnSite Platinum Member
    Messages: 4,253

    Buy a Dixie Chopper or buy a quad runner and a pull behind type mower and then you can go up to 40mph!!
  7. farrsfastfords

    farrsfastfords LawnSite Member
    Messages: 4

    From my understanding, simply changing the pullies may increase volume slightly but its similar to pedaling faster on a paddle boat...not necessarily any faster. Based on my research one needs to change the pumps to a larger volume...Anyone else agree?
  8. farrsfastfords

    farrsfastfords LawnSite Member
    Messages: 4

    Because although you may not be able to mow this fast you can transport the machine faster on a large property.:wall
  9. djagusch

    djagusch LawnSite Platinum Member
    from MN
    Messages: 4,346

    It depends on the machine actually. I would say most have designed the system so the pumps run 2400 to 2600 rpm's, 3600rpm is max rpm according to hydro gear. I know one manufacture that runs them close to the 3600rpm (badboy).

    So lets say yours runs the 2400 to 2600rpm. Changing the pulley the pump will increase volume (aka speed) to the wheel motors. If it is running 3600rpm then I wouldn't bump it up.

    I know Scag's pretty well. The difference between the 10mph on the 27hp riders and the 12mph 29hp riders is just pulley size. I'm guessing they decided this in field testing to prevent engine bogging and such.

    What machine are you running? What engine? Do you know the pump and wheel motor size? Also pulley size? I can do some calc's.
  10. Brett's Cutting Edge

    Brett's Cutting Edge LawnSite Member
    from novi
    Messages: 150

    There is a reason that they run the speeds they do. Engineers spend tons of hours designing pumps and everything. If they thought changing the pulley would work it would have come with that option. If i wanted something faster i would buy something different. I dont need stuff breaking down on a job and having large repair bills, causewe all know hydro pumps are not cheap.

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