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  1. #1
    Bronze Member bruski's Avatar
    Join Date
    Sep 2007
    Posts
    62
    Location
    rural Missouri
    Tractor
    Kubota b2400HSD

    Default bush hog blade bolt removal

    I'm changing the blades on my little Bush Hog sq480 as they're pretty beaten up and I want to do some pasture cutting. I've gotten the nuts and washers off thru the view holes using PB Blaster and a cheater bar (thanks to info on this site) but now the bolts seem to be frozen in unless I'm missing something. Beneath the mower the bolts appear to be round headed and I've tried a pipe wrench to loosen it and I've beaten gently on the top, but no move. They are supposed to drop out aren't they? Is there something to be loosened first? Have I missed something?

    Bruski

  2. #2
    Silver Member
    Join Date
    May 2003
    Posts
    160
    Location
    Indiana
    Tractor
    Deere 3005

    Default Re: bush hog blade bolt removal

    Generally (at least on the ones I've owned) the bolts have a square section between the head and the threaded part of the bolt. This fits in a square hole in the stump jumper, and is the reason you don't need a second wrench/socket or whatever to take them off or put them on. Try to find a piece of pipe or something similar, smaller in diameter than the bolt. You can use it sort of like a punch, along with a mallet, on the end of the threaded section on the bolt and likely get it out that way.

  3. #3
    Advertiser sweettractors's Avatar
    Join Date
    Jul 2003
    Posts
    7,420
    Location
    Central Kentucky
    Tractor
    JD 6403 CHA-JD 3130 CHA

    Default Re: bush hog blade bolt removal

    Quote Originally Posted by bruski View Post
    I'm changing the blades on my little Bush Hog sq480 as they're pretty beaten up and I want to do some pasture cutting. I've gotten the nuts and washers off thru the view holes using PB Blaster and a cheater bar (thanks to info on this site) but now the bolts seem to be frozen in unless I'm missing something. Beneath the mower the bolts appear to be round headed and I've tried a pipe wrench to loosen it and I've beaten gently on the top, but no move. They are supposed to drop out aren't they? Is there something to be loosened first? Have I missed something?

    Bruski
    There is usually a key on the blade bolt to keep it from turning. After removing the nut and lock washer, you should be able to knock them right out the bottom. If no-go, heat always works. Ken Sweet
    http://www.sweetfarms.com/

    Sweet Farm Equipment LLC (Internet Sales, Shipping All States)
    Shipping Facility
    1815 Defries Rd., Canmer, Ky 42722 Toll Free 1-866-528-3323
    Ken Sweet sweet@scrtc.com

    Shipping Example: Can ship 800 lbs from Ky. to Dallas for $165
    The Northeast shipping corridor is a little more expensive.

  4. #4
    Platinum Member
    Join Date
    Dec 2006
    Posts
    722
    Location
    Columbus, Georgia
    Tractor
    Kuborta B2400, L2900, L4330; Caterpillar D3B, John Deere 455D

    Default Re: bush hog blade bolt removal

    Bruski:

    Ken Sweet is correct; the shoulder of the bolt has a "key" formed by pinching the shoulder of the bolt. The key fits into a slot in the side of the hole in the bladeholder.

    The blade bolt has probably rusted in the hold in the blade holder.

    Just hitting the bolt lightly from above, through the hole in the deck, does not deliver much shock to the bolt because the blade holder and the mower deck flex enough to absorb the sharp blow.

    Support the end of the blade holder next to the bolt with a solid object. A block of steel is preferable, but a hydraulic jack works about as well.

    Then screw the nut back onto the blade bolt until the end of the bolt is flush with the nut. Put a steel rod larger in diameter than the bolt (1 1/4" I would guess) on the bolt head and nut and then whack it hard with a three or four pound hammer.

    If that does not work spray some PB Blaster on the bolt and come back tomorrow for a second round.

    Ken Sweet is also correct about heat. I don't think either the blade bolt or blade holder are heat treated, so heat will not hurt them. I favor heating the blade holder so that it expands and then hammer the bolt out before it cools down, but others favor heating the bolt so that it expands in the hole and loosens the grip of the rust; then let it cool and hammer it out.

    In either case, put some antiseize on the blade bolts when you reassemble them.

  5. #5
    Bronze Member bruski's Avatar
    Join Date
    Sep 2007
    Posts
    62
    Location
    rural Missouri
    Tractor
    Kubota b2400HSD

    Default Re: bush hog blade bolt removal

    Finally got them both out, one yesterday, one today. PB Blaster wouldn't do it, finally did it with lots of heat - let it cool and then simply beat the sucker out. No damage. All is good. Cleaning up the bolts tonight before smearing with antiseize to install tomorrow. BTW, no key, just stuck tighter than, well, tight.

    Thanks for the tips.

    Bruski

  6. #6
    New Member
    Join Date
    Aug 2010
    Posts
    3
    Tractor
    IH 330 Utility

    Default Re: bush hog blade bolt removal

    OK, the bolts on my bush hog just turn in the blade and blade holder. They are a little snug, but trying to turn the nut just turns the bolt too.

    How in the world can I get those out, short of a cutting torch?

    Jim

  7. #7
    Super Star Member
    Join Date
    Mar 2008
    Posts
    13,498
    Location
    Northern Fingerlakes region of NY, USA
    Tractor
    Kubota L3830GST, B7500HST, BX2660

    Default Re: bush hog blade bolt removal

    Angle Grinder? Pipe wrench on the top of the bolt?

    Aaron Z
    A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects.
    Robert Heinlein, Time Enough for Love

  8. #8
    Advertiser sweettractors's Avatar
    Join Date
    Jul 2003
    Posts
    7,420
    Location
    Central Kentucky
    Tractor
    JD 6403 CHA-JD 3130 CHA

    Default Re: bush hog blade bolt removal

    Sometimes you can get a pipe wrench on the blade bolt head and hold it from turning. You could also weld a large nut on the head to hold to and of course, the cutting torch is the quickest way to cut off the blade bolt nut. Ken Sweet
    http://www.sweetfarms.com/

    Sweet Farm Equipment LLC (Internet Sales, Shipping All States)
    Shipping Facility
    1815 Defries Rd., Canmer, Ky 42722 Toll Free 1-866-528-3323
    Ken Sweet sweet@scrtc.com

    Shipping Example: Can ship 800 lbs from Ky. to Dallas for $165
    The Northeast shipping corridor is a little more expensive.

  9. #9
    Veteran Member
    Join Date
    Aug 2004
    Posts
    1,893
    Location
    Caldwell Co. NC
    Tractor
    2006 Kama554; 92 Belarus 250AS

    Default Re: bush hog blade bolt removal

    I second the pipe wrench on the bolt head. Plan on a 3 foot cheater bar on each wrench. That was the first use for my 3/4" drive ratchet set from HF.
    2006 Kama 554, 92 Belarus 250AS, Bombardier Outlander Max 400.

  10. #10
    New Member
    Join Date
    Aug 2010
    Posts
    3
    Tractor
    IH 330 Utility

    Default Re: bush hog blade bolt removal

    Thanks. Good ideas. After reading the posts about sharpening, I'm thinking I don't need to have sharp edges for whacking down the brush...

    Jim

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