[AT] Case 430 drawbar

[Cecil Bearden]

Most of the holes in drawbars and lift arms were punched at the 
factory.  They they were tempered.  I think tha t due to the hole in the 
bar, there was some unequal quenching in some areas and caused surface 
cracking in the metal that over a period of time led to failure.    Thus 
the reason for a 12months warranty on most manufactured products.  
However, the amount required to purchase new machinery makes one feel 
the machine should be failure free for at least 15 years.

Cecil in OKla


On 12/26/2016 8:14 AM, Len Rugen wrote:
> H & M's U shaped drawbars broke at the center hole, quicker if you hooked directly in that hole instead of using the swinging drawbar or a hitch plate.  https://cdn.shopify.com/s/files/1/0543/7597/products/1_4fccb61c-c2c9-406c-80e4-43ca495957fa_large.jpeg?v=1449183348 The last one we broke was a WD-45, it had ran a roto-baler for about a million bales.  It broke at a bolt hole also, I figure it had work hardened from the PTO vibration and impact from towing the baler.  Those drawbars weren't solidly mounted, they flopped a little with every bump the baler hit.
> I broke a lift arm on my MF255 a few years ago with a 8' semi-mounted cutter.  I dropped one tractor wheel into a ditch (not that big) and the twist and opposite of normal direction force snapped the arm.  There was a slightly rusted crack at the beginning of the break, again at a bolt hole.
>
> Len Rugen
>
> rugenl at yahoo.com
>
>
>   
>
>      On Sunday, December 25, 2016 6:57 PM, Len Rugen <rugenl at yahoo.com> wrote:
>   
>
>   Yea, we discussed the pros/cons of making one :-)   We were still wondering what it looked like, but I think I just found a picture.  It seemed that the swinging part had to wrap back up and over the arc'ed plate with the holes, that part is on the tractor.
> I think this is what it looks like: http://photos.yesterdaystractors.com/gallery/uptest/a135024.jpg
> We have been calling it a 430, but its gas, so I guess it's really a 440, but I think the drawbar would be the same.
> At 34 HP & 3200 lbs, this pic sure looks like overkill :-)
>   
>
> Len Rugen
>
> rugenl at yahoo.com
>
>
>   
>
>      On Sunday, December 25, 2016 6:15 PM, Greg Hass <ghass at m3isp.com> wrote:
>   
>
>   Try Agri-supply. I just looked and they do have some swinging drawbars
> at what I think are fair prices. You may have to change the mounting
> some to make one fit, but that should not be a problem as you are not
> dealing with 500 hp. . That is one reason I enjoy making implements for
> my Farmall Cub because with its smaller hp. it does not take an
> engineering degree to make them work. I don't think I would try making
> the drawbar itself as it is too hard to get the springiness correct. To
> hard a metal and they snap ( a neighbor once made one out of a heavy
> grader blade edge and it broke the first time he bounced through a
> furrow with a manure spreader). Use regular steel and it will probably
> bend. Years ago, we broke a drawbar on an IH 504, too much weight going
> through a sharp furrow; I tried welding it but it changed the temper of
> the steel and if stressed it would always break again near the weld.
> Hope this helps.
>          Greg Hass
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