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I don't have a lathe . . .

Grumpy

. . but I do have an ancient compact tractor!

The power steering ram is connected to the steering arm with the usual ball coupling but with a straight M12 bolt rather than the tapered bolt that you generally find on track rod ends.

Unfortunately the M12 hole in the steering arm has become ovalled causing excessive play.

The steering arm is part of the casting for the front hub and 4WD system and cannot be removed so any repair will have to be in situ.

My first thoughts were to try and drill out and then ream the oval to 18mm and insert a new 12mm id bush but I was wondering if the collective brains on here had a better solution.

Thanks. G

Parents

  • I'd put a straight bolt through that rose joint - it would never have had a tapered fitting.

    When you drill a new hole, how will you ensure that it is true and round, and perpendicular?

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  • I'd put a straight bolt through that rose joint - it would never have had a tapered fitting.

    When you drill a new hole, how will you ensure that it is true and round, and perpendicular?

Children
  • in reply to Chris Pearson
    • The truth is I can't. I'll just have to do the best I can. I'm hoping the "round" will be catered for by an interference fit bush and that the  rose joint will have enough tolerance if I'm a bit off perpendicular. What do you think Chris?
  • in reply to Grumpy

    I don't think that the rose joint will mind.

  • in reply to Grumpy

    I think being a tight fit so that the bush does not spin in the enlarged hole nor the bolt shank move inside the bush will be more important - what you really do not want is the bolt threads moving and chewing up the non-moving joints. The only part that should both pivot and rock is the lubricated and hopefully hardened ball within the joint - and it ought to be able to accommodate  alignment errors of a few degrees and full rotation about the hole axis but you can verify its safe wobble range will be enough by testing it in advance with a long spike or a chunk of studding.

    Mike

  • in reply to mapj1

    Thank you for your replies. So, are you saying Mike that I could, in effect, bolt a stud into the steering arm with a nut top and bottom so that it is rigid, immobile and then secure the rose joint with, maybe, an R clip?

    If so, what I really want is some sort of stud that is smooth, hardened at one end and M12 threaded on the other.

    I'd be grateful if you could keep applying your minds to this!!

  • in reply to Grumpy

    So am I looking for something like this?

    What on earth do I google?

  • in reply to Grumpy

    No, but you could have an over-sized stepped bolt inserted from below.

    Sorry, I forgot, you don't have a lathe. Wink

    Forget nuts top and bottom and R-clips. The inner part of the rose joint needs to be firmly clamped to the steering arm in such a way that nothing will come loose.

  • in reply to Grumpy

    Well that didn't upload. Try this.

  • in reply to Grumpy

    R-clips have their uses, but mostly so that things may be disassembled readily, or in place of a split pin.

  • in reply to Chris Pearson

    Sorry Chris, I don't quite understand what you're saying. Can't insert a stepped bolt from below as the steering tie rod is in the way. I thought I had it clear in my head but surely the rose joint should be "floating"

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