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  1. #1

    Default Bolt size on a JD mower deck

    I'm looking to find the bolt size for the bolt that holds one of the blades on the (48")mower deck of a John Deere L120.

    I want to replace them and I can't find out what size bolt it is.

  2. #2
    Platinum Member joecdeere's Avatar
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    Apr 2002
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    Default Re: Bolt size on a JD mower deck

    it is a M10x30 bolt Deere # 19m7786

  3. #3

    Default Re: Bolt size on a JD mower deck

    Hey, Thanks so much Joe..........!

  4. #4
    Elite Member zzvyb6's Avatar
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    michigan
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    jd 1070

    Default Re: Bolt size on a JD mower deck

    I can guess why you need to know this. I'd appreciate info on what coating, oil, graphite or Nothing is best to use for an easier release when removing them. I always need a breaker bar and a piece of wood to block the blades.
    There is no "I" in team, but there is a "Me" if you want to jumble it up a bit...

  5. #5

    Default Re: Bolt size on a JD mower deck

    You got that right!! I got the breaker bar and wood block out in the garage right now. I rounded a bolt head and had a fun time gettin it out. So I thought it was a good time to replace all the bolts that hold the blades on.

    I don't think there is an easier way unless you have an air ratchet.......which I don't.

  6. #6
    Platinum Member
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    Default Re: Bolt size on a JD mower deck

    A air rachet won't get it either but a 1/2 air impact wrench will. A 6 point socket helps for when the bolts start to loose their corners. I have fought the wrench and board thing you guys talke about and hated it.

    You don't need much of a compressor to take blade bolts off. An electric impact works well. Last time I tried my 18V Dewalt impact and it did the job with out dragging out a hose.

    Lots of reasons to get more tools

    Dan

  7. #7
    Veteran Member
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    JD 4310 eHydro, JD 322

    Default Re: Bolt size on a JD mower deck

    If you use power tools make sure you know which direction you need to go as most are reverse thread. I have impact guns and use the breaker bar and wood block because I like to "feel" how tight it is. My breaker bar is 40" long.

  8. #8
    Platinum Member
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    Buffalo, New York
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    318 John Deere, 4200 John Deere, 1947 John Deere "M"

    Default Re: Bolt size on a JD mower deck

    I always use "Never-Seize" for stuff like this or lug nuts. ~S

  9. #9
    Gold Member
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    2008 Kubota BX2660

    Default Re: Bolt size on a JD mower deck

    Never try messing with them with a 12 point socket or wrench. ONLY use 6 point and the bolt head should hold its shape.

  10. #10
    New Member
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    Dawsonville, GA, USA
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    Ford 3000

    Default Re: Bolt size on a JD mower deck

    Hey, in case anyone runs across this thread. I got of the phone with John Deere. Those bolts are 15mm on my 48" mower deck of my L120.

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