Deck height adjustment question?

Discussion in 'Lawn Mowing' started by tool, Nov 17, 2004.

  1. tool

    tool LawnSite Member
    Posts: 4

    I just got a Ferris 52" Dual hydro with hanging deck & 23 hp Kaw vtwin. I was wondering what deck setting I should use for the best cut; level, tilted slightly forward, or slightly backwards? Any advice would be greatly appreciated!
     
  2. dishboy

    dishboy LawnSite Platinum Member
    from zone 6
    Posts: 4,308

    Usually 1/8in to 1/4in nose lower than rear is reccomended. I like 1/8in. John Deere sells a blade height checker for around seven dollars.
     
  3. tool

    tool LawnSite Member
    Posts: 4

    Thanks dishboy. I actually called Ferris about it since it came tilted backwards from the factory & I had to modify/machine the caster wheel bolt hole locations to level it. The guy at Ferris said he thought level would be best with a hanging deck but wasn't sure & would have the boss call back, he never did. Thanks again!
     
  4. Runner

    Runner LawnSite Fanatic
    Posts: 13,494

    Yes, level is NOT the best setting. There is a certain amount of turbulance and and forward blow to account for, and level will cause the grass to blow down some before it is lifted. Like it was stated above, a positive rake of 1/8" is the optimum amount for most mowers. However, this should be measured from bladetips, not deck frame. The blades should be pointed straight forward and back, and the height is measured then on a SMOOTH, FLAT surface.
     
  5. kipcom

    kipcom LawnSite Senior Member
    from indiana
    Posts: 352

    As stated....On a smooth, flat surface... Here is a TIP for you. Use a 3 - 4 foot level on the surface you have the mower on and check for "level" then (+) or (-) the difference when you adjust your 1/8" rake. Most surfaces are not exactly level so check the surface your mower is on before you make any adjustments.
     
  6. tool

    tool LawnSite Member
    Posts: 4

    The first time I used it when I got it home, some of the debris was being discharged out the front end of the deck over the top of the mower & into my face. I wasn't 100% sure if it was a deck/blade height issue because it was a newly grown lawn which still had a lot of straw & some loose dirt on it, but I was sure that it was real annoying!

    The suction/blowing effect is so powerful that I can see how 1/8-1/4" can be a big factor & it makes sense now why a pos rake is necessary.
    Thanks again for all of your help!!!
     
  7. Ability

    Ability LawnSite Member
    Posts: 90

    "a positive rake of 1/8"


    Please forgive my ignorance.

    What exactly is a rake?

    And what is positive vs. negative?

    Thanks
     
  8. work_it

    work_it LawnSite Senior Member
    Posts: 976

    The rake is the angle of the blade (in this case). A positive rake is when the blade is positioned so it's pointing toward the front of the deck and the front tip/end of the blade is lower than the back tip of the blade. Just the opposite for a negative rake; the back tip is lower than the front tip.
     
  9. PLM-1

    PLM-1 LawnSite Bronze Member
    Posts: 1,640

    Rake is an incline from perpendicular. On mower decks (propeller blades and ship masts are different of course) positive is the rear lifted and negative is the rear lowered. hope this helps
     
  10. Ability

    Ability LawnSite Member
    Posts: 90

    Thanks Work It and Joplin.....that helps ALOT!!!!!

    I have been playing with my deck adjustments for months now and everything said in this thread helps alot.
     

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