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  1. #1

    Default John Deere 506 Brush Hog

    I had some issues with my JD 506 brush hog this weekend. Once attached to the tractor, I kept shearing bolts that contact the PTO to the gear box. I shear about 5 bolts before giving up. I looked under the mower to see any obstructions, but everything appeared clear.

    Does any one have ideas as to why I'm shearing bolts right and left? The cheat grass is in need of cutting and my significant other is pretty unhappy about the lack of progress!

    Regards, Spring Hollow Tractor Man

  2. #2
    Elite Member
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    Default Re: John Deere 506 Brush Hog

    be deduction - if there are no obstruction I think it has to be in the gear box.. did you check to see if the gear box has oil in it? I am assuming that the PTO work with other equipment though..

    brian
    Bedford, VA
    2320 w/ 62D MMM, 200CX FEL, Pats EZ Change, LX4 Cutter
    Co-owner (with my father) of John Deere 790, 30 HP, 4x4, 513 cutter, 70 FEL
    2012 Nissan Xterra Pro-4x

  3. #3

    Default Re: John Deere 506 Brush Hog

    Brian,

    The gear box does have oil and the PTO does work on other implements. I was thinking that maybe I need to engage the PTO at a lower rpm initially and maybe that would resolve my bolts shearing issue. What do you think?

  4. #4
    Super Star Member
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    Default Re: John Deere 506 Brush Hog

    That might be it...what rpm are you engaging the PTO?
    What tractor are you using?

  5. #5
    Super Star Member RoyJackson's Avatar
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    Default Re: John Deere 506 Brush Hog

    Quote Originally Posted by lwoomer View Post
    Brian,

    The gear box does have oil and the PTO does work on other implements. I was thinking that maybe I need to engage the PTO at a lower rpm initially and maybe that would resolve my bolts shearing issue. What do you think?
    I engage my cutter at about 1500 RPM...just keep your foot near the throttle if you need to "blip" it (if the tractors starts to stall). You may need a little lower or a little higher RPM. Once it's running, give it a few seconds for the blades to pivot out. Don't be surprised if there is considerable vibration initially.
    If that solves the problem...great! If it shears pins during operation, you may have something binding up the blades or spindles (underneath the cutter).
    Roy Jackson

    "Any government that does not trust its citizens with firearms is either a tyranny, or planning to become one."
    -Joseph P. Martino

  6. #6
    New Member
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    Jul 2007
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    Default Re: John Deere 506 Brush Hog

    I use an old 5 footer than shears bolts bad if not treated nicely. The yoke is simply wore out but I can still use it provided that I engage it below 1000 rpm and build up engine speed. Another key is to not to back up. The cost to rebuild the yoke and shaft would probably be more than it's worth. If yours is doing it all of a sudden, I would check your gear oil, u joints, etc.

  7. #7

    Default Re: John Deere 506 Brush Hog

    Thanks to everyone for the advice. I will hook up the mower this weekend and see if adjusting the PTO RPMs when engaging the mower will work.

    Best Regards

  8. #8
    Super Star Member
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    Default Re: John Deere 506 Brush Hog

    Quote Originally Posted by beenthere View Post
    That might be it...what rpm are you engaging the PTO?
    What tractor are you using?
    Didn't want to answer these questions?

    It is ok, but would be helpful to know.

  9. #9

    Default Re: John Deere 506 Brush Hog

    Sorry, I have a kubota L3400 4WD HDT tractor and I've been starting the mower at PTO around 1500 RPMs in the past with no problems. So this situation is unique and that's why it's a little wierd from previous performance.

  10. #10
    Gold Member 204saskman's Avatar
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    Default Re: John Deere 506 Brush Hog

    I had a problem like this with a old finish mower, it turned out being that i was engaging it to high of rpm(1500). I then idled it down to around 900-1000 and it made the difference. I just worked my rpm back up to around 2200 and all was good after.
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