Does double blades damage spindles?

Discussion in 'Lawn Mowing' started by excell, Feb 4, 2005.

  1. excell

    excell LawnSite Member
    Messages: 23

    I bought a 60" Toro ZTR at the end of the 2004 season and was wondering with the talk of double blades on the mowers, will that affect and/or damage the spindles?

    I have never used double blades, is the cut a huge difference?
  2. tiedeman

    tiedeman LawnSite Fanatic
    from earth
    Messages: 8,745

    some people will say that the doubles do a good job and some will say they notice no difference. Personally with me I have never noticed a difference in using doubles. Also I have noticed a slight decrease in HP by using doubles
  3. lawnchopper

    lawnchopper LawnSite Member
    Messages: 211

    I was wondering this myself. I would think you'd have to make sure that all the blades are balanced accuratly. On our GD super surfer we put double blades on. Gators on top and high lifts on the bottom and just cranked them down. We got better clipping dispersal which was a problem on our SS. There defintily was a loss of HP however.
  4. rodfather

    rodfather LawnSite Fanatic
    Messages: 9,501

    We've never had a problem on any of our machines running doubles...just remember to engage the blades at a lower rpm.
  5. FrankenScagMachines

    FrankenScagMachines LawnSite Platinum Member
    from IN
    Messages: 4,739

    No problems here... Rarely have used them on the Ferris Z, but the Exmark TTHP always has doubles on it, my favorite combo is gators on top of standard lift blades... works great on an Exmark, best mulching action, best dispersal, great vacuum and cut as well. Works well in wet or dry and leaves. Best all around combo IMHO. Used to have an old Scag walk behind also, used same doubles combo on it. That combo also uses less horsepower than double regular blades (which I don't like the way they discharge BTW, but just my preference).
    Is yours the new TurboForce deck? I don't think anyone has commented on here about running doubles on it... But, the way its deck is designed, it should not need doubles as much as other mowers since you can adjust the deck easily.
  6. KathysLGC

    KathysLGC LawnSite Bronze Member
    Messages: 1,345

    i think the most important point of damage risk is in the balance of the blades. If they are balanced and you engaged the blades at a lower rpm you shouldn't have any problems.
  7. Jason Pallas

    Jason Pallas LawnSite Bronze Member
    Messages: 1,335

    I've often pondered this same question. From my own experience, I think that the doubles actually stabilize the balance on the spindle bearings and produce less wear. It's a little like putting a bigger flywheel on an engine crankshaft - a larger (doublebaldes) flywheel can be slightly out of balance and not have as big an affect as a smaller (single blade) flywheel that is similarly out of balance. The larger weight distribution forgives some of the disparity in balance. Thus, I believe, that as long as the blades on a double blade configuration are reasonably in balance, the wear and tear on the spindle assembly/bearings is actually less than with singles. But you willnotice a drop in engine HP and should defintely engage the blades at a lower rpm. Hope that helps.
  8. PR Fect

    PR Fect LawnSite Bronze Member
    Messages: 1,076

    Excell, we put on our Toro 52 inch Z master, and then added a Quickchute. Love the set up! Keep them greased. I engage them a full rpm. 23 hp Kohler bogs down allot at low rpm. I worry alittle about the clutch, but so far no problem, and the cut is great. Did modify the spindles with a bastard file and a small hand grinder. I will try a few pic's.

  9. PR Fect

    PR Fect LawnSite Bronze Member
    Messages: 1,076

    OK so thats what it look like from TORO. And this is after I got ahold of it!

    Toro Spindle Doubles.JPG
  10. PR Fect

    PR Fect LawnSite Bronze Member
    Messages: 1,076

    And with the blades. Gator on top, Toro high lift on bottom.


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