4140/4142 alloy steel for frnt cross-bar replcmnt (at14459t)

[dnormand25]

What would the group opinion be for using 4140 alloy round to manufacture a replacement front cross-bar replacement for a early 1010c. The original cross-bar seems to be annealed and not hardened and i would use the 4140 in its annealed state also.
Thanks for the opinions

dpn
dnormand25@gmail.com

[country53]

4140/42 Properly hardened and drawn is very tough,although if any welding was involved I wouldnt recommend it. I wouldn't use it in the annealed state it will crack when stresses are applied after installation.
Probably JD used C1087 when they made it. 1087 is very widely used in farming equitment because it doesn't work hardened easily and will bend some before it breaks. I obtained most of this info from the Machinist Handbook and working in industrial repair most of my life.

These younger guys tell me they got the handbook on the internet now,
but I dont know how to find it.

I drove my 420 today, I cleaned out a cattle barn, lot of fun, Good Luck with your crawler. When You get er fixed You'll love it.

[wwattson]

I'm guessing the front crossbar on my 1010CA is 1018. I don't believe it's as high a carbon content as a 1087 as it has flanges welded on both ends and the rear crossbar has the attachment for the drawbar welded in the center of it. It is my understanding that welding steel with that level of carbon content would tend to the tricky side and in the application, 1018 would be acceptable in that it's only a 30hp machine and weights less than 10,000# in nearly any configuration.

1045 is another alloy to look at for this. It's about the same cost as 4140 but about 40% stronger that annealed 4140 and 1018 (annealed 4140 and 1018 have very similar tensile and yield strengths). 1045 can be welded with proper attention to preheating. All three of these alloys are readily available so it's your choice. I couldn't find the Deere spec on the older crossbars but when I have located similar parts within the Deere designs, they used 1018 where they could.

[Lavoy]

I would add that you do not want anything that is remotely brittle, way to much shock loading for that.
As to alloys, remember you are dealing with a 40 or more year old product, so it is doubtful it was anything very exotic.
Lavoy

[dnormand25]

Thanks for everyones comments. I'm probably going to go with the 1018 as I have a round I my shop. On the bright side if it doesn't work I should be able replace it and reassemble in half the time.... the second time around. lol