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  1. #1
    Member
    Join Date
    Sep 2008
    Posts
    34
    Location
    Eastern Arkansas
    Tractor
    Kubota BX2200

    Default MMM noise

    Hi all,
    I have a BX2360 with a 60" MMM purchased last fall. Since new, at 2400 RPM or above, I get a high pitched noise from the mower. It's not a squeal like metal on metal or a dry bearing. It's more of a whirr, like a blade tip noise. The higher the RPMs, the higher pitched and louder it is. My BIL has said he can hear it from his house 150 yards away. I have checked the obvious things - the gearbox is full, the bearings have been pumped full, and I switched around the blades. Nothing wobbles. With the mower off, there is no noise from the mid PTO.
    Has anyone else run across anything like this or have any thoughts?
    Thanks

  2. #2
    Elite Member whistlepig's Avatar
    Join Date
    Jan 2009
    Posts
    3,906
    Location
    Preble County, Ohio
    Tractor
    Kubota B7800 with FEL

    Default Re: MMM noise

    Does it have an idler pulley that tensions the belt?
    ........Shoot this thang! Have mercy this thang is killin' me. Just shoot up here amongst us. One of us has got to have some relief..............
    jerry clowers-a coon huntin story.

  3. #3
    Elite Member Don87's Avatar
    Join Date
    May 2010
    Posts
    4,226
    Location
    SW Pa.
    Tractor
    Massey Ferguson GC2400

    Default Re: MMM noise

    Quote Originally Posted by carlcroom View Post
    Hi all,
    I have a BX2360 with a 60" MMM purchased last fall. Since new, at 2400 RPM or above, I get a high pitched noise from the mower. It's not a squeal like metal on metal or a dry bearing. It's more of a whirr, like a blade tip noise. The higher the RPMs, the higher pitched and louder it is. My BIL has said he can hear it from his house 150 yards away. I have checked the obvious things - the gearbox is full, the bearings have been pumped full, and I switched around the blades. Nothing wobbles. With the mower off, there is no noise from the mid PTO.
    Has anyone else run across anything like this or have any thoughts?
    Thanks
    Install a radio, and turn it up til the 'whirr' is gone.




    Just joking, my Massey does the same thing. It's like a jet taking off, and it is the blade tips hitting the air, and creating the suction to pull the blades of grass up in the air to be cut.
    Don

    MF GC2400, FEL, 60in.MMM, 5ft. Cultivator, Single Bottom Plow, Bush Hog RTC48 tiller, MF 2360 front mount snowblower, 5ft backblade. BXpanded Piranha toothbar.

  4. #4
    Super Member 94BULLITT's Avatar
    Join Date
    Feb 2011
    Posts
    6,522
    Location
    Frederick County, VA
    Tractor
    Kubota BX2360 & L4240 HSTC

    Default Re: MMM noise

    Mine sings a little and you can hear the blades.

    Here is a video of mine I made with my phone see if yours sounds like that (click on it to play)

    Roger

    Kubota BX2360 & Kubota L4240 with paddle shifter, suicide doors and 24's
    Past Stuff: Ford 8N, Cub Cadet 2206, Bobcat CT235

    My Threads

    EA Wicked Grapple Build - 3PH Pallet Mover - Harbor Freight QH Mods - L4240 Upgrades - BX2360 Upgrades- How Add a Switch to a Worklight

    My YouTube Channel

  5. #5
    Silver Member DB Pilot's Avatar
    Join Date
    Feb 2013
    Posts
    151
    Location
    SW, New York
    Tractor
    David Brown 780 Selectomatic, L3800 Kubota, BX2200 Kubota

    Default Re: MMM noise

    Carl, I have a BX2200 with a 60" MMM. I have also experienced that whirring noise. Check the nut located at the grease fittings at top or rotors. It might be loose. It is not apparent when installing blades as they will tighten even with that top nut loose. I have had to loctite mine on. Mine is only the left most blade as soon as I hear that sound I have to tighten that nut every time and then it goes away. Hope it isn't your middle blade if this turns out to be the problem.

  6. #6
    Silver Member
    Join Date
    Jun 2008
    Posts
    142
    Location
    SW Iowa
    Tractor
    BX24

    Default Re: MMM noise

    Is the deck clean? I had a mower that would start making a similar noise if the grass built up under the deck.

    Take Care,
    Doug in SW IA

  7. #7
    Member
    Join Date
    Sep 2008
    Posts
    34
    Location
    Eastern Arkansas
    Tractor
    Kubota BX2200

    Default Re: MMM noise

    Thanks for all the replies. Don87 and 94BULLIT -that's kinda what it sounds like and that's what I was afraid of. As the RPMs get higher, it will give you a headache. My old BX200 and mower did not make this noise.
    DB Pilot, I did not think of that and I will check them.

  8. #8
    Gold Member
    Join Date
    Mar 2007
    Posts
    333
    Location
    Dimock, Pa.
    Tractor
    Kubota L4240 Kubota B7800, Kubota BX2200

    Default Re: MMM noise

    I've had the same problem with the top nut coming loose and it's easy to check!

    Quote Originally Posted by DB Pilot View Post
    Carl, I have a BX2200 with a 60" MMM. I have also experienced that whirring noise. Check the nut located at the grease fittings at top or rotors. It might be loose. It is not apparent when installing blades as they will tighten even with that top nut loose. I have had to loctite mine on. Mine is only the left most blade as soon as I hear that sound I have to tighten that nut every time and then it goes away. Hope it isn't your middle blade if this turns out to be the problem.

  9. #9
    Gold Member
    Join Date
    Jul 2004
    Posts
    284
    Location
    Cartersville (NW) Georgia
    Tractor
    John Deere 1025r TLB

    Default Re: MMM noise

    I always use a set of foam ear plugs when cutting grass. Makes things so peaceful just riding around.
    '13 JD 1025r TLB
    60D MMM w/ electric over hydraulic independent lift
    Custom Seat Springs (no more bottoming out)
    Single Point Quick Disconnect
    180* Thermostat
    Artillian Forks (42")
    Ken's Bolt On Hooks
    Omni Transformer

  10. #10
    Veteran Member RaydaKub's Avatar
    Join Date
    Sep 2011
    Posts
    1,385
    Location
    Rochester, MN
    Tractor
    Kubota BX2230

    Default Re: MMM noise

    Quote Originally Posted by DB Pilot View Post
    Check the nut located at the grease fittings at top or rotors. It might be loose. It is not apparent when installing blades as they will tighten even with that top nut loose.
    Excellent tip. I'll have to look at mine before I mount it again. Thanks!

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