Swing cylinder bushings

helmdog · Apr 16, 2023

I'm trying to change the pins and bushings on the swing cylinder on my 510C. I first tried a threaded puller. Didn't budge. Now I've rigged a 50 Ton hydraulic bottle jack to push out the bushing, still won't budge.

I've applied heat, beating on it with 50 tons of pressure.

Is there a trick?

Thanks,
Joe

mtb34 · Apr 16, 2023

Check out this youtube video ... it can be
tough

https://m.youtube.com/watch?v=Kfu1c36rB7Y

helmdog · Apr 17, 2023

Good video, but not what we're working on exactly.

This post was edited by helmdog on 04/17/2023 at 07:53 am.

helmdog · Apr 17, 2023

Here's an image:

https://u.pcloud.link/publink/show?code=XZs3XqVZjvl0s2be2WQdyaGdX20xpFB7zoby

This post was edited by helmdog on 04/17/2023 at 07:55 am.

mtb34 · Apr 17, 2023

Read your post again ... do you mean the actual swing cylinder itself, not just the attachment to the tower from the cylinder rod?

If that is the case I am assuming you have the cylinder removed from the machine and in a vise or other mechanism that you can use to hold it while you pound it out with punch or drift.

I use a 5 lb short handled sledge for emphasis.

Can you specify if you are talking about part #7 or #24 in the diagram I attached.

mtb34 · Apr 17, 2023

Thanks for the photo ... so it is the rod bushing, not the cylinder bushings.

I would pull the rod, and rebuild the guide seals, packing 16, 17, 19, 20, 22. Hopefully you havent damaged the guide or misshaped the cylinder body in any way with that jack.

Once you have the rod out you can use a press or attempt to hammer it out again.

Replacement rods can be expensive but hopefully you can salvage it.

helmdog · Apr 17, 2023

Yes in your picture, bushing #24. The cylinder was previously rebuilt and in good shape, so I really don't want to pull it apart if I can. There is no pressure on the rod as the jack is pushing and pulling at the same time, by the chains. We can freely move the cylinder back and forth with the jack on it.

We have altered the setup a little bit and the bushing moved about an 1/8", but it seems stuck again. I was hoping once it moved a bit it would be easier, but apparently not.

However, if we can't I suspect we'll have to pull the rod as you suggest.

Thanks for the advice.

Jim.ME · Apr 17, 2023

You are replacing those bushings with new correct? If so, weld 2 or 3 beads of 7018 around the inside circumference of the bushings. When it cools it will shrink the bushing some and it should come out easier.

helmdog · Apr 17, 2023

Thanks everyone for the advice. I was able to finally get them changed. Our make-shift press worked after several iterations and a lot of heat. We pressed the old bushings out while pressing the new ones in.

It would build extreme pressure then pop an 1/8th inch, this happened most of the way. The other side came out much easier.

This image isn't a magic trick, the jack is really of the ground

Ah, finally, new bushings.

helmdog · Apr 17, 2023

Oh, and mtb34, after watching the video you sent, I realized I did have that issue as well, so I'm putting in new shims as well. Thanks again.

Swing cylinder bushings

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