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Bumper fell off???

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Richard

01-19-2002 05:14:39




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Well, finally got that tractor out of the ditch. She was sitting totally on her belly and it took some doing (2 days). My rear pipe bumper on the 4x4 1 ton decided to come off during the process. It wasn't welded to the frame but rather had 3 1/2" bolts in each side that were grade 5. They sheared off like you used a chop saw. I will replace them then put a little weld on it as well, but I was curious to how much force it would take to shear 6 1/2" bolts. I guess I know the answer (8000# x 20 MPH x End Of Strap = Bumper Removal) .

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steve II JD4000

01-20-2002 14:54:59




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 Re: Bumper fell off??? in reply to Richard, 01-19-2002 05:14:39  
Next time you pulling a stuck tractor then use other tractor to pull that tractor out. other way you kill the pick up.



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Paul

01-19-2002 17:58:29




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 Re: Bumper fell off??? in reply to Richard, 01-19-2002 05:14:39  
Did ya tweak the frame after the bumper incident? I always wondered why EVERYONE of the used 4x4's I ever had had a slightly, (sometimes more than slightly) sprung frame!



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Rory

01-19-2002 10:11:56




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 Re: Bumper fell off??? in reply to Richard, 01-19-2002 05:14:39  
According to my trusty pocket ref a grade 5 bolt is rated at 120000 psi.
At .196sq in/bolt X 6 that is 1.178 sq in. X 120000 = 141,372 pounds. Wow that seems way too high. I suppose it would depend on how much torque was on the bolts to begin with. Also it would imply that all the bolts failed at the exact same moment.(unlikely) My guess is they failed one or two at a time that gets us down to 23,562 pounds per bolt. (not alot when you are stopping a large vehicle in a short distance)

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Kevin

01-19-2002 08:11:57




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 Re: Bumper fell off??? in reply to Richard, 01-19-2002 05:14:39  
That was quite a yank! I would be happy that the bolts sheared, usually the bolts hold but they tear/elongate the frame of the truck instead! Remember, the strengh of a bolt is measured by the resistance is has to being stretched while clamping down (Tightening). So, if you "made sure those nuts weren't going anywhere" by torquing them as hard as you could, you prestressed the bolt or stretched it and its shearing resistance was lessened by a bit.

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butch in kansas

01-19-2002 12:48:33




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 Re: Re: Bumper fell off??? in reply to Kevin, 01-19-2002 08:11:57  
NEXT TIME PUT A USED TIRE BETWEEN TWO CHAINS AND THEN YANK LIKE THEIR IS NO END YOUR BUMPER WILL STILL BE THEIR



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Richard

01-19-2002 16:05:36




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 Re: Re: Re: Bumper fell off??? in reply to butch in kansas, 01-19-2002 12:48:33  
We used Kevlar crane chockers, I found quickly they don't stretch. I used tire was used on the front bumper on the second try. Much easier on my old bones too.



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olddog

01-23-2002 15:07:34




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 Re: Re: Re: Re: Bumper fell off??? in reply to Richard, 01-19-2002 16:05:36  
Rich, put grade 5 back in with flatwashers and lockwashers, torqued to spec. They make bolts every day but bumpers and frames come harder to find. Does your truck still fit in the garage? :-)



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