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  1. #1
    New Member nanaman's Avatar
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    May 2010
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    Virginia - Northern Neck
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    NH 5610S

    Default Flail Knives. Sharpen or replace?

    For you experienced flail mower users, do you sharpen or just replace your mower knives.

    nanaman
    New Holland 5610S
    Alamo flail mower/12'2" cut, 5' Bush Hog finish mower, Ferris IS3100Z zero turn mower

  2. #2
    Super Member greg_g's Avatar
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    Dec 2003
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    6,028
    Location
    Western Kentucky
    Tractor
    JD3720 Cab, 300X loader with 4-in-1 bucket

    Default Re: Flail Knives. Sharpen or replace?

    Depends upon your workload and wallet. Replacing rather than sharpening is more expensive in terms of cash outlay, but cheaper in terms of time invested. I have more time than money, so I sharpen mine. I keep a new spare to compare alongside those that are destined for the grinder. When the dull ones approach 1/2 the size of the new one, then I replace them.

    //greg//
    USN (Ret)
    Former Chinese tractor owner (x4)
    Current John Deere owner

  3. #3
    Gold Member
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    May 2010
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    262
    Location
    N.E. Arkansas (transplant)

    Default Re: Flail Knives. Sharpen or replace?

    I"ll echo greg's comments. And add, usually i sharpen them on the mower either by standing the mower upright by lifting it with the loader if not attached to the tractor, or by unhooking the pto shaft and toplink and using a comealong to pivot the mower on the lift arms. Note that in either case a safety chain is attached to the loader bucket or ROPS so that a serious oops doesnt occur.
    Then grip each knife with a pair of vice grips and touch them up with a 4 inch angle grinder.
    Of course one wants a good face shield long sleeves and gloves also.

  4. #4
    Platinum Member
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    Jul 2006
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    964
    Location
    WI
    Tractor
    John Deere 2520, X475

    Default Re: Flail Knives. Sharpen or replace?

    Its only 3 bolts to remove on my JD LX4, so I remove the blades and put them on the bench grinder and do a good job of sharpening them. Takes all of a hour if you take your time.
    JD 2520 --- FEL, I-Match, Frontier RC2460 Rotary Cutter, Pallet Forks, DR Brush Chipper, JD Ballast Box, 71 Flex Planter!

  5. #5
    New Member nanaman's Avatar
    Join Date
    May 2010
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    Virginia - Northern Neck
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    NH 5610S

    Default Re: Flail Knives. Sharpen or replace?

    Thanks all: I will try to sharpen the knives to see if the time needed makes it worthwhile.

    nanaman
    New Holland 5610S
    Alamo flail mower/12'2" cut, 5' Bush Hog finish mower, Ferris IS3100Z zero turn mower

  6. #6
    Super Star Member IslandTractor's Avatar
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    Sep 2005
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    15,471
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    Prudence Island, RI
    Tractor
    2007 Kioti DK40se HST, Woods BH

    Default Re: Flail Knives. Sharpen or replace?

    Quote Originally Posted by nanaman View Post
    For you experienced flail mower users, do you sharpen or just replace your mower knives.

    nanaman
    Don't forget you can also just flip them over/reverse them when one side gets dull. That probably takes longer than grinding them in place but doesn't take long especially with an air ratchet.

  7. #7
    Super Member dcyrilc's Avatar
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    Woodinville, Washington
    Tractor
    John Deere 2240 MFWD

    Default Re: Flail Knives. Sharpen or replace?

    Quote Originally Posted by IslandTractor View Post
    Don't forget you can also just flip them over/reverse them when one side gets dull. That probably takes longer than grinding them in place but doesn't take long especially with an air ratchet.
    That's what I need to take the time to do. The current edge is shot on most of them. I'll probably touch them up while I have them off.
    Cyril

    JD 2240 MFWD (with duels now)
    145 FEL, 8ft Rear blade (now I need a 12ft blade)



  8. #8
    Gold Member
    Join Date
    Oct 2007
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    440
    Location
    Levittown & Long Eddy NY
    Tractor
    09 kubota L4400, 4x4, R4's

    Default Re: Flail Knives. Sharpen or replace?

    Lift the mower attatched to 3pt, secure with jack stands, I use a 4" grinder you just have to shine them up no need to take a lot of material, every two sharpening s I reverse the blades, and repeat the process.

  9. #9
    Super Member dcyrilc's Avatar
    Join Date
    Nov 2009
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    5,473
    Location
    Woodinville, Washington
    Tractor
    John Deere 2240 MFWD

    Default Re: Flail Knives. Sharpen or replace?

    Quote Originally Posted by spo307 View Post
    Lift the mower attatched to 3pt, secure with jack stands, I use a 4" grinder you just have to shine them up no need to take a lot of material, every two sharpening s I reverse the blades, and repeat the process.
    About 90% of my knives are worn into a nice rounded end rather than square. That side is pretty well shot. It was that way when I bought it. The back side still looks pretty good. Just need to turn them around and shine the other side.
    Cyril

    JD 2240 MFWD (with duels now)
    145 FEL, 8ft Rear blade (now I need a 12ft blade)



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