Posted by Bulldozer on January 26, 2013 at 18:40:18 from (24.165.92.6):
In Reply to: Bulldozer- weak axle posted by Mr. T. Minnesota on January 26, 2013 at 12:46:00:
The estimated ~420# is the extra vertical static load applied at the hole in the axle through the king pin and bushing load path that the N series tractor could safely handle from accessories, etc.
The weight of the tire, wheel, splindle and any extra wheel weights do not contribute any gravity load to the center axle.
Since the axle is cast steel the material inherently has casting flaws (voids), which reduces the strength of the material compared to the same material being hot rolled, cold rolled or forged. However, the chances of the casting having a flaw in the region of maximum stress is rather remote ,but the allowable working load would be determined based on the void occuring in the worst possible spot, unless x-rayed.
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