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Tool Talk Discussion Forum

shaft frozen in cast iron hubs

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waynekittler

10-03-2003 18:31:45

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I am working on an old IH21 spreader. The rear beater (spiral one) 1 1/4 shaft is frozen in both hubs on each side of the beater. Soaked for a week with Blaster, tapped it hard enough, removed fittings and filled with Blaster then forced with lithium grease.Nowhere.
Since these hubs are 4 feet apart, if I heat them, how will I know if one is free, since the other is still holding ? And with all the Blaster and fresh grease somewhere in these hubs, could I end up with an explosion, fire or metal damage ? I have all sorts of time to use chemical means to get this shaft turning. The cast and steel combination is new to me.So again I turn to you, the professional.

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wdTom

10-04-2003 20:09:04

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Re: shaft frozen in cast iron hubs in reply to waynekittler, 10-03-2003 18:31:45

After the hubs are heated it might help to cool the shaft with wet rags or even ice. Have friend keep heat on while you cool, then hammer before heat equalizes.

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T_Bone

10-04-2003 10:21:44

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Re: shaft frozen in cast iron hubs in reply to waynekittler, 10-03-2003 18:31:45

Hi Wyane,

Heat does do wonders by slightly expanding the heated part. Usually preapply some pressure then apply about 400* heat will be enough to move the part.

Too high of heat, more than 500*, removes the steel temper. The part would then need to retempered before using.

Too see this easyly, lay a old flywheel on blocks then heat the ring gear until the flywheel falls off. It does not take much heat to expand the ring gear.

Explosions occur by having a fuel source, carbon, with the correct amount oxygen with in a confinement. If the open air then the carbon would just burn if that hot.

T_Bone

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Fred P

10-04-2003 08:15:11

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Re: shaft frozen in cast iron hubs in reply to waynekittler, 10-03-2003 18:31:45

Remove the grease fitting before you heat it. I had a grease fiting shoot though a shop wall a few years back. Heat will most likely free it up.

Fred P

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MarkB

10-04-2003 05:36:26

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Re: shaft frozen in cast iron hubs in reply to waynekittler, 10-03-2003 18:31:45

Heat is the only thing that's going to free those hubs. I don't thing your going to get an explosion, but the grease will probably start burning before you get them apart. Keep a hose handy in case things get out of hand.

If you heat the hubs until they're cherry red, they will come off.

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