What went Wrong on this Hub?

1 Dollar · Jan 8, 2010

Put this in a press after soaking in solvent for 2 days and spraying with oil weeks before that. Heated with a rosebud and as it was being tapped with the hammer in the press it snapped. Only thing I think could have been done differently was use a pipe over the axle and press against that. Any ideas on preventing this from happening next time?

Guess I still need 1 more hub.

Thanks

johns48jdb · Jan 8, 2010

Heated unevenly? Hiting on the outer edges? I assume you had cut the axle off a parts tractor to get the hub off easier in the shop. Seems like i've heard of guys driving a small chisel in several places to try to break things loose first before trying to put them in a press or useing a puller. maybe you just didn't use the right amount of words that sailors use on it. lol. good luck

teddy52food · Jan 8, 2010

The inside part that you heated expanded. The outer part stayed cool & didn't expand enough. Something had to give & it broke at the thin bolt hole.

Machinery-Man · Jan 9, 2010

Looks like you exerted enought force and finally destroyed the item. An old JD mechanic explained the process some time ago. He said items such as this are 0 clearance and any movement without removing the crude will force one part to climb over the crude and then break or at the least wedge to the point you can't move. He said the best this is slight shock to jar the crude loose, some over all heating but if you can get it moving ever or slightly back and forth then you can keep cleaning out the crud. I wouldn't recommend the chisel idea as a friend of mine lost an eye to such. Use something like a vibrating tool. I know once you finally get this all cleaned up sometimes it hard to keep them tight....

BushogPapa · Jan 9, 2010

Well that's one way to get it off...!!

Looks like you can weld it together and it will be fine..

Ron..

johns48jdb · Jan 9, 2010

My idea on the chisel was to just force the chisel in a very little bit all the way around and put as much wd-40 type stuff in there while you have the chiesel in place. The other poster was right when he said back and forth. Once you ever get anything to release a little bit tighten it right back up. This breaks the crud loose and gives it s chance to fall off/out without piling up and making things harder to do.

Bushed · Jan 9, 2010

What went wrong?, it's hard to say for sure without being there and witnessing how it was being pressed. Maybe a combination of too much pressure in the press, not pushing on the hub casting evenly or pushing on the outside of the hub rather than pressing on the hubs boss, uneven heating, tapping too hard with the hammer. You've got to remember that cast iron is strong yet very brittle, particularly a lot of the old stuff people are trying to fix.

Looking at the positve side of all this, at least you got the shaft seperated from the hub.

buickanddeere · Jan 9, 2010

(quoted from post at 15:49:51 01/08/10) Put this in a press after soaking in solvent for 2 days and spraying with oil weeks before that. Heated with a rosebud and as it was being tapped with the hammer in the press it snapped. Only thing I think could have been done differently was use a pipe over the axle and press against that. Any ideas on preventing this from happening next time?

<img src="http://i58.photobucket.com/albums/g256/1Dollar_2006/DSCN0405.jpg">

<img src="http://i58.photobucket.com/albums/g256/1Dollar_2006/DSCN0406.jpg">

Guess I still need 1 more hub.

Thanks

Looks like a thermal stress bust.

atwater · Jan 9, 2010

my suggestion for next time would be on something that size is to put it in a wood stove for a couple of hours so it is cherry red if you can get that mess in the press or set it up to tap with a hammer it should go. or even let it cool off slowly and try to move it after. I have had good luck with this sort of process. good luck

RandyB(MI) · Jan 9, 2010

You will find that if you would have just taken the thinnest cut-off disc you can find ,1/32 " , and cut down through that very spot on the "large hole" in the hub , that it will relieve the stress build up from the rust trapped between the axle and hub and it will slide right off. Then you will have a nice perfect even slot that can be filled with jb weld after re-assembly and painted and will never be detectable and has NOTHING to do with the strength of the hub. Actually you could cut all three slots in all three holes and not compromise strength since these thirds are all bolted solid to the recess in the cast center anyway. They cant move once re mounted. I spent over a week trying all the "witches brews" and rose buds and big jacks and nothing worked. None of these will release the huge amount of pressure built up from expanding rust between axle and hub. Split it and be done with it! I will never waste my time again doing it any other way. They say you can heat that hole edge red enough to release the pressure and let it go. Tried it , never worked. Guess you could try it before cutting. nothing to lose,.

What went Wrong on this Hub?

1 Dollar

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johns48jdb

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teddy52food

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Machinery-Man

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BushogPapa

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johns48jdb

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Bushed

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buickanddeere

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atwater

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RandyB(MI)

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