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Ferris Mower leaving strips uncut near the middle of the deck

Discussion in 'Lawn Mowing' started by Southernlandscape343, Sep 26, 2008.

  1. JimQ

    JimQ LawnSite Bronze Member
    Messages: 1,139

    This is not debatable. It's fact. What is debatable is the impact it will have on cut quality. Worst case, the shortest a 21" blade can get is 20.78". That reduces blade overlap by .43"



  2. bigbutch

    bigbutch LawnSite Member
    Messages: 17

    I have the same thing with my XMARK. If the grass is long and wet I get a row in the middle. I have to clean under the deck and sharpen the blades. We cut a lot of small sticks and the blades get dull quickly. I would like to fiend better blades.
  3. Ramairfreak98ss

    Ramairfreak98ss LawnSite Silver Member
    Messages: 2,210

    southern.. I have a similar model, different deck but have had the same problem at times.

    Its the 15hp/34" simplicity pacer machine. When going full speed ~4.5mph, and the grass is either wet or heavy or tall, it will leave a patch for some reason just because it like pushes it over. I think in my situation on this machine, the suction on the deck is perfect in most areas, "except" this middel portion near where my tiny 10" blade spins at the left and the bigger 16" blade spins on the right side, maybe turbulence and deck design?

    Your ferris hydro has a totally different deck though so i'd assume talking to otther Wright stander 34" owners that its a flaw in the physics more so of the deck size, the 2 blade design or many things combined related to size and geometry.

    If you figure anything out let me know. The simplicity deck has "plates that sit "under" the very tips of where the blade spins to create a funnel like for mulching more, it sucks though for real tall grasses, makes it cut unevenly.
  4. Southernlandscape343

    Southernlandscape343 LawnSite Member
    Messages: 166

    Ramair, you may want to try the gator blades if you have not already. That really sounds like what would also happen when the grass was a little wet. I cut two yards that are really thick bermuda wet the other day and had no problems. The only grass that would show up after the cut was where I would turn around or back the mower up, but that was easy just to use the blower and blow the left over grass onto the ground.
    Last edited: Sep 30, 2008
  5. mr mow

    mr mow LawnSite Senior Member
    Messages: 393

    ok guys!!! what fatjack, jimq, myself are trying to say is .43(jim Q excellent diagram) does make a difference...that equals more than 3/4" (.86... .75=3/4")at most possible wear of overlap. They truely dont overlap though! My point is when sharpen, keep blade as parallel to back side of blade through out. The diagram that JIM Q provided(second pic) illustrates blade tip loss. That my friends is where the most cutting occurs.
  6. mikes280z

    mikes280z LawnSite Member
    Messages: 24

    i think some ferris mowers don't have a really good blade tip speed. and if you have regular lift. or grass only blades. you may solve your problem with a hi lift. either way hi lift generaly gives a better cut. pluss sucks up much more come cleanup time
  7. Southernlandscape343

    Southernlandscape343 LawnSite Member
    Messages: 166

    Bringing this thread back to life.. I've sprayed silicone lubricant under the deck, PAM cooking spray.. I keep the blades nice and sharp, and still have this problem. I regularlly grease the spindles. I keep the blades balanced. I went with the Gator high lift blades last year.. It seemed to help some, but I still have the problem. I am not cutting at a fast pace, so I know thats not the issue. Heck I've inched it along and it does it still.
    I have lost most of my clients due to the economy and them having to save their money and cut their own yard.. So I am not cutting nearly as many yards as I should be.
    Then again right now the bermuda is still dormant(sp)
    The John Deere dealership that I bought it from is no longer around. There is another local shop, but they don't service ferris mowers. I had the guy at the local shop look up what size blades the 32 hydrocut uses. He gave me exactly what the book said size wise. My belt is showing some wear but I don't think it is quite enough to make it start leaving spots uncut.. It's supossed to snow here tonight and then we might have freezing rain tomorrow. So I will take some pictures of under the deck along with the belt.

    Anyone have any other ideas?
    The mower didnt start so I bought some of this "Blaster" small engine stuff that you remove the spark plugs.. and spray in the spark plug hole for 20 seconds.. then replace the sparkplug but do not connect the lead to the plug. (did this for both spark plugs) It then states to use the pull start and do that a few times.. supossed to lubricate the cylinders. It got out a bunch of carbon deposits.. but I could not get my mower started again until I bought new plugs and added seafoam to the gas.. The mower is up and running now thanks to seafoam and new spark plugs. I've let it burn through about one full tank of gas and let it smoke like its supossed to. seems to be running smoother now.. now I just need to get the issue with the uncut spots figured out while I have down time.

    *** Please note that I do not in any way, shape or form suggest using this "blaster" small engine tune up. I am sticking with SeaFoam. Also I am no longer using the regular Sta-bil. I am using the Marine Sta-bil, which helps deal with the ethenol issues better than the regular Sta-bil.
  8. LexingtonKYcutter

    LexingtonKYcutter LawnSite Member
    Messages: 153

    First thing I would think would be the deck pitch. Always make sure the nose is a lower than the back.... If you dont have a dealer near you, why not try calling the factory. Im sure there would someone there who could help you out and answer some questions.
  9. Southernlandscape343

    Southernlandscape343 LawnSite Member
    Messages: 166

    Yeah, It's worth a shot. As long as I don't have to listen to elevator music for thirty minutes before talking to a real living person. :laugh:
  10. hornett22

    hornett22 LawnSite Senior Member
    Messages: 396

    Good advice on here.

    Does any manufacturer besides Scag use blade spacers?

    It's amazing how much you can fine tune the cut on the Scags.

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