Removing a kingpin pin.

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Mikerb
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Removing a kingpin pin.

Post #1 by Mikerb » Thu Jan 29, 2015 2:42 pm

I am trying to change the front wheel kingpins in my 1987 JCB 3CX, but having trouble removing the holding pin. It seems to be rusted in place.

I have hammered on the threaded side, but that has just bent the threaded part and I ended up snapping it off.

Before I try drilling it out, does anyone know a way of getting them out.

I thought about welding the threaded end of a bolt (with a nut on it) onto the non threaded side of the pin, and making a steel bracket to brace against the machine that the bolt will go through, then tightening up the nut against the bracket, hopefully pulling the pin out as it tightens up. I hope this makes sense?

*EDIT: See picture below.*

JCB.jpg


Cheers

Mike
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Jeremy Rowland
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Re: Removing a kingpin pin.

Post #2 by Jeremy Rowland » Thu Jan 29, 2015 8:32 pm

Mike if this is a tapered pin that locks the kingpin into position in the axle then if they are anything like the ones that I used to take out of the Seddon Atkinson axles when I changed the kingpins on those trucks, the tapered pin could be a real pig to get out.
I recall that I once drilled one dead central and still struggled to get it out of the axle; you could try your idea but you may snap the weld on the pin before it moves, I would opt to carefully drill it out with a cobalt coated jobber drill, just a suggestion anyway.

Jeremy


Mrsmackpaul
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Re: Removing a kingpin pin.

Post #3 by Mrsmackpaul » Fri Jan 30, 2015 12:43 am

are still trying to remove the small cotter pin bolt thingo or is it the pin it self ?
King pins on trucks I have to use a jack and make up a press to push the pins out with axle in place or take the axle out and use a press
but I might be talking about a different kettle of fish

Paul
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mechman
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Re: Removing a kingpin pin.

Post #4 by mechman » Sat Jan 31, 2015 1:36 am

Mike have you given oxy acetylene a thought if its feasible
Norm


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Re: Removing a kingpin pin.

Post #5 by david000 » Sun Feb 01, 2015 2:09 pm

Last one we did ended up having to drill both the pins out.
it may be worth trying the puller in your post but as Jeremy said the weld is likely to snap before it moves.


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Re: Removing a kingpin pin.

Post #6 by Mikerb » Sun Feb 01, 2015 11:21 pm

Mrsmackpaul - I am trying to remove the small holding pin.

mechman - Do you mean oxyacet to heat it up or to cut the pin out?

I think I'll try a mixture of heating it with oxyacet and the puller. and see how it goes. If that fails I'll have to drill it out.

Why is nothing easy on these things!!!

Regards

Mike


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Re: Removing a kingpin pin.

Post #7 by mechman » Sun Feb 01, 2015 11:35 pm

Hi Mikerb.
I meant heat the axle up and use a straight punch on the pin but seeing as that you have a puller as well use them both together, as much tension as poss on the puller heat axle then use punch.

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FOWLER MAN
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Re: Removing a kingpin pin.

Post #8 by FOWLER MAN » Mon Feb 02, 2015 12:02 am

mechman wrote:Hi Mikerb.
I meant heat the axle up and use a straight punch on the pin but seeing as that you have a puller as well use them both together, as much tension as poss on the puller heat axle then use punch.


Yes,
I've done a few, I used to get the axle glowing before trying the pin.
Remember if you weld the pin and still have to drill it out , the weld may make drilling more difficult.


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Re: Removing a kingpin pin.

Post #9 by Mrsmackpaul » Mon Feb 02, 2015 12:20 am

please forgive my my dumb thoughts BUTTTTTTTTTTTTTT

if it is the cotter pint as I call it that goes thru the axle and holds the king pin in the axle not the stub axle all the ones I have done wont come out like you are trying it will just get stuck tighter as you are trying to force it in further
the cotter pin is tappered and has to be driven thru the axle the nut that you have broken off is only to hold it in place the tighter you pull it the harder it will be wedged in

I have never ever had to heat I have always been told not to ever heat as you might weaken the steel in the axle or the stub axle
Image

take note of the bolt circled with yellow also take note of red arrow showing tapper

unless we are all talking about something different I have never known of a different style of king pin set good luck with it all and if it is as I am describing your going the wrong way

Paul
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Re: Removing a kingpin pin.

Post #10 by Mrsmackpaul » Mon Feb 02, 2015 12:24 am

well just had a quick google
and if this is your machine you can see it is tappered and has to be driven thru as I have described


Image

Paul
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