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Talntedmrgreen

Dozer hitch failure

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Talntedmrgreen

My buddy struck a landscape block, stopping him in his tracks on his 917, and this was the result. Can't say I've seen this happen before. He is using a spring trip 42" blade, and a spring adjustable lift rod.

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A upon closer inspection, all but one of the welds where the lift arm meets the frame, are brocken, and already showing rust...so they have been that way prior to his incident.

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ReedS

Ouch! I can't print what I am thinking here! Certain parts of my anatomy ache just thinking about hitting something that hard, with a spring trip no less! That had to be quite a shot on that hitch to break it like that, I would have expected a bend but not a break!

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HubbardRA

It appears that the steel in that hitch contained more carbon than normal structural steel. The higher amount of carbon makes the steel more heat treatable. The forward portion was most likely welded, then someone stuck the piece in water to cool it quickly so that they could set it up for the next series of welds. The metal appears to have been hardened from quenching to the point that it was made brittle. Brittle material will develop cracks just from loading and stressing. If the hitch is welded back together, do not quench it in water to cool it down. Let it cool down slowly on its own so that it will not become brittle and will retain its normal toughness.

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