Thin bushing removal?
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Topic author - Posts: 913
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Thin bushing removal?
Hi, I am wanting to replace the pictured brake cam bushing but it is just a thin shell left. The regular bushing removal tool moved it only a little because the bushing is too thin. Is there an easy way to take it out?
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Re: Thin bushing removal?
I don't know about easy, but a cape chisel might do the job.
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Re: Thin bushing removal?
The chisel is a good approach. Another I'd suggest is a hack saw blade. Cut it in two places and push out the pieces.
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Topic author - Posts: 913
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Re: Thin bushing removal?
Thanks so the replacement brass bushings are 1926-27 but the outer diameter seems big for the hole am I supposed to sand it down?
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Re: Thin bushing removal?
You can leave the hacksaw blade in its frame. Undo the blade from the frame, thread it through the hols and re-attach it to the frame. Now you can apply the usual load. If the old bush is a split steel bush, make your cut opposite the split. If it is a bronze bush, you can make two cuts.
Allan from down under.
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Re: Thin bushing removal?
I replaced my brake bushings a few months ago using a bushing driver and a big hammer. I did nothing to the outside diameter of the bushing. It was an easy job. This was on my '26.
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Re: Thin bushing removal?
Don’t remember what size it was but I used a socket out of my tool box and it fit just right to use as a driver to drive the bushing out. I put it on an extension and that’s all there was to it.
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Re: Thin bushing removal?
Measure the ID of the hole and the OD of the new bushing. If the bushing is only a couple thou oversize, I would go ahead and press it in. If it's oversized a lot, I would make a mandrel for it, stick it in a drill, and turn it against some coarse sandpaper. It could also be turned down in a lathe.
The inevitable often happens.
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Re: Thin bushing removal?
How about an old threaded tap that could be screwed in and knock the whole thing out with a drift and hammer! Or maybe it is too thin!
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Re: Thin bushing removal?
Looks like there is plenty of bushing there. The indent is from your driver tool. I’d say that either you have the wrong driver or it’s poorly made. The outside diameter of the driver you are using is too small.
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Re: Thin bushing removal?
I've spent a lifetime working with and on excavators. Often having to remove damaged and worn bushes of various sizes and metals. The most effective method is to heat the bush with propane gas or similar and then douse it with plenty of cold water. This usually breaks the seal between the different metals allowing the bush to be driven out with ease. Good luck!
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Re: Thin bushing removal?
Your right about heating the bushing up and cooling it down. I’ve taken them out of springs and fittings doing that then almost pushing them with with a socket or bushing driver. The rust breaks down to sort of release it.
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Re: Thin bushing removal?
Adam has it! Your driver tool diameter is too small and it's forcing itself into the bushing, spreading it further open and only making things tighter. You need a driver with a bigger shoulder. For comparison, slip your driver tool into the new bushing and see how much smaller the driver diameter is compared to the outer diameter of the bushing. They should be nearly the same size.
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Re: Thin bushing removal?
I am using the 'Shackle and Spindle Arm Bushing Driver' from Lang's https://www.modeltford.com/item/3820-44T.aspx I've cut it with a hack saw on 2 sides (see pictures) and whacked it pretty hard with a 5 pound hammer but it doesn't seem to budge. The brake drum backing plate is off. The insect larvae uncovered is a plus. I could use advice at this point because it doesn't seem to be moving. Hack saw it more? The last picture has the new bushing right beside where it is supposed to go for comparison.
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Re: Thin bushing removal?
They are out with a combination of hack saw and hammer. They really wouldn't move at all until they had been cut enough with the hack saw to collapse or compress.
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Re: Thin bushing removal?
I'm surprised no no has suggested using a small round punch ground to a narrow point on one side. Get it started on one edge of the bushing next to the backing plate. Use a small hammer and tap it down repeatedly so the point of the puch cuts a groove in the bushing . Keep tapping until the bushing is cut through from top to bottom. Then use the tool to curl inward one edge of the bushing next to the cut and work it out of the hole. It works. Being careful you don't damage the backing plate as you invariably do using a hacksaw blade.
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Re: Thin bushing removal?
There are punches made for removing thin bushings. They form a half-circle on the leading edge. You place one edge of the "Smile" against the edge of the bushing, then tap down on it, and it cuts and collapses the bushing as it goes. Snap-On sells these.
When using a hacksaw, don't go all the wall through. Saw gently until the bushing is to the point it will collapse on itself. Watch the saw kerf to see a color change. "As long as you see gold, you are golden. If you see black, pull back." - reorient the blade with your aim, to make it ride on just the areas that still show gold (brass color)
When you have it very thin in 2 places (doesn't have to be across from each other. 2 slots at 45 degrees relative to the centerline of the bushing will work fine) get a thin pointed awl or scribe, place it on the joint line between the bushing and the structure, and tap it in. You will see the bushing lift and collapse, and it will soon pop right out.
When using a hacksaw, don't go all the wall through. Saw gently until the bushing is to the point it will collapse on itself. Watch the saw kerf to see a color change. "As long as you see gold, you are golden. If you see black, pull back." - reorient the blade with your aim, to make it ride on just the areas that still show gold (brass color)
When you have it very thin in 2 places (doesn't have to be across from each other. 2 slots at 45 degrees relative to the centerline of the bushing will work fine) get a thin pointed awl or scribe, place it on the joint line between the bushing and the structure, and tap it in. You will see the bushing lift and collapse, and it will soon pop right out.
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Re: Thin bushing removal?
Turns out my bushing removal tool was fine it would simply not budging whatsoever until I cut it with a hacksaw. I was whaling on it with a 5 pound sledge, was bending the plate and it wasn't happening. After I cut a sufficiently deep cut to make it collapse a bit then and only then it moved.
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Re: Thin bushing removal?
As previously stated, the driver you had WAS too small for the job. Had it been correct for removing the bushing, you very likely would have driven it out with a 5 pound sledge in about 6 wacks. The small diameter shoulder of an undersize driver actually peens the bushing into the bore and makes it stick harder. Just my observation having removed these particular bushings dozens of times.
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Re: Thin bushing removal?
I guess I am a oddball but on bushings like this,I use a dremel tool and a carbide burr to cut a "ditch" on 2 sides of the bushing,not really a thin slot but more of literaly a ditch shaped groove.This weakens a large area on 2 sides.I watch Closely for a change in metal color so I don't go to far.Punches,Well I use a very thin 1 to get started.
To install the new bushings, i have a old fridge-freezer in the shop with ice and drinks in it. I put the new bushings in the freezer for a while before trying to put them in.shrinks them and makes them a bit easier to press in.IF you can put that backing plate in a vise or press and press that new bushing in,it might work easier than putting in with ahammer.
My dad repaired alot of worn backhoe bushings in his days as a mechanic and he would get dry ice to put the new bushings in for awhile before install.
To install the new bushings, i have a old fridge-freezer in the shop with ice and drinks in it. I put the new bushings in the freezer for a while before trying to put them in.shrinks them and makes them a bit easier to press in.IF you can put that backing plate in a vise or press and press that new bushing in,it might work easier than putting in with ahammer.
My dad repaired alot of worn backhoe bushings in his days as a mechanic and he would get dry ice to put the new bushings in for awhile before install.
If you can't help em, don't hinder em'
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Re: Thin bushing removal?
I have found that what works best for me after messing with junk, er, I mean things mechanical for over fifty years, is to heat the I.D. cherry red with an oxy/acetylene torch and then walk away and let it cool. This not only breaks down the rust to a powder, it shrinks whatever it is that you are trying to remove. This works on just about anything that is in inside of something, bushings, bearing races, pipe fittings etc., etc. And no, it doesn't get the outer parts too hot either, unless you just set there and let it cook. If done right, the outer part won't get any hotter than if it was setting out in the blazing sun at 100+ Deg. If done correctly, usually the offending part will almost fall out by itself, unless of course, it has been beat to death with the wrong driver and a big hammer. Just trying to help. JMHO. Dave
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Re: Thin bushing removal?
Yup. You are correct sir.Adam wrote: ↑Fri Jun 26, 2020 12:07 pmAs previously stated, the driver you had WAS too small for the job. Had it been correct for removing the bushing, you very likely would have driven it out with a 5 pound sledge in about 6 wacks. The small diameter shoulder of an undersize driver actually peens the bushing into the bore and makes it stick harder. Just my observation having removed these particular bushings dozens of times.
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Topic author - Posts: 913
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Re: Thin bushing removal?
What is and where can I get the proper driver?
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Re: Thin bushing removal?
Ignacio,
You can see in your old bushing how the driver jammed itself in for what appears to be about 3/32" at the one end. This is what made the bushing so tight, even after it was split. The driver being rammed into the end of the bushing expanded it and made it all the more tighter. Therefore, a proper driver would have a wider shoulder, to more fully engage the end of the bushing, and a diameter just a little bit smaller than the outside diameter of the bushing you're removing. Where to get one is a different matter. Aside from making one on a lathe, you might try measuring the bushing diameter, then sourcing a length of metric drill rod from McMaster-Carr. I say metric because some metric sizes will be just a tad smaller than fractional sizes. In most cases, the next available smaller fractional size is already too small. Anyway, once the rod is purchased, it would be ideal to step down the diameter of one end to just slip nicely into the bushing. This gives you a nice pilot, or guide, to center the tool over the bushing. That's where a lathe would be handy. The pilot however is not 100% essential, if you can hold the tool central to the bushing until it begins to move. After that, the the hole you're driving the bushing out of becomes your guide. Hope this helps.
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Re: Thin bushing removal?
Ignacio, I bought the same bushing driver that you bought. It worked perfectly to replace my brake bushings.