Would not be concerned so much about the bumper, but more on sand cast front axle, since the cantilever weight combines additional shear stress to the bending stress already developed from the basic tractor weight.
However, addressing the bumper which is the current subject and not the axle,..
On dynamic loading, DOT uses a dynamic load factor = 3X for highway.
For barn yard and dirt field work could reduce dynamic load factor to 2X.
The static stress on the bumper bar at the bend where it bolts to the axle ~ 15 ksi compared to 36 ksi allowable for hot rolled steel, based on a 400# weight.
Applying a 2X dynamic load factor places the stress = 30 ksi, and safety margin = 16% ,which is safe enough.
The attachment bolts are loaded by a "heel-toe" arrangement. With a 400# cantilever weight, there is plenty of safety margin on the 5/8" bolts, even using grade 2.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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