Kingpin to bell crank arm attachment

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DavidBarkey Canada
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Re: Kingpin to bell crank arm attachment

Post by DavidBarkey »

@thebuildist I would start with replacing the pin and make sure all is still tight . Then find another smaller pin that will press in that new pin . I have seen this from factory on high shock load application . No one hit did this . It has been a many that add up do to the fact that it is hollow . adding a second pin in side of it reduces the deflection . I have seen spiral pin , cotter pins, and what looks like a old common nail pressed in and then peened or bent to keep in place. Spiral pins also work well , but must be clocked so the forces are not on the over lap .
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Re: Kingpin to bell crank arm attachment

Post by thebuildist »

Thanks everyone for your input. Based on all the ideas, it seems like I don't need to go nuclear and cut a spline into this thing.

It seems like either the coiled spring pin or Dave's idea of putting a pin inside a pin. What a neat idea. I never thought of that.

I did some measuring today. And it looks like I drilled it 9/32.

I know that I used a roll pin that I had on hand. So I'm wondering if I actually had an 8 mm roll pin on hand. Because a quarter inch roll pin is too small and a 5/16 roll pin should be too big.

And if I did pound a 5/16 roll pin down into that hole, then maybe I damaged it by curling it so tight.

I say all that to say that I'm going to drill it out to 5/16 and either put in a 5/16 coiled spring pin or a 5/16 pin with another pin inside of it the way Dave recommended.

I'm going to order them both and think about it while they're on the way.

But thanks again everyone.

Bob
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Re: Kingpin to bell crank arm attachment

Post by thebuildist »

I decided to go ahead with the 5/16 regular roll pin and put a 3/16 roll pin inside of that.

But before I did that I also realized that the outer collar that the roll pin is going through is a little thin. The kingpin is a 1-in rod and the collar going around the kingpin is only 5/16 of an inch thick.

And I think in retrospect that one of the things that happened is that 5/16 was applying a narrow pressure to the side walls of the roll pin and causing the flexing that ultimately led to failure.

So I decided to make that collar thicker. And to do that I bought a one and a half inch ID shaft collar from tractor supply and stuck it in the lathe and bored it out to a thousandth of an inch less than the OD of the current collar, and pressed it on.

Then I went ahead and welded the gap between the steering arm and the new outer collar.
PXL_20221123_145124809.MP.jpg
PXL_20221123_145128646.jpg
Lastly I drilled through both collars to 5/16 of an inch, and drilled out the kingpin to 5/16 of an inch. And drove in the 5/16 roll pin, followed by a 3/16 roll pin into the center of that.
PXL_20221123_151203779.jpg
Time will tell how it holds up. But I feel good about it.
Bob
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Re: Kingpin to bell crank arm attachment

Post by DavidBarkey »

Should be good to go now Bob @thebuildist
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Re: Kingpin to bell crank arm attachment

Post by Seabee »

What tractor are you working on?
Bill Moyer
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Re: Kingpin to bell crank arm attachment

Post by thebuildist »

Seabee wrote: Wed Nov 23, 2022 10:07 pm What tractor are you working on?
It's a highly customized Ingersoll 4020.

Custom heavy duty front axle, reinforced frame, removable loader.

Bob

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Re: Kingpin to bell crank arm attachment

Post by Seabee »

Thank You! I found the thread interesting, but couldn't figure out what tractor was getting the special treatment.

Bill
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