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Join Date: Dec 2008
Location: Young NSW Aust
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Hollow Shaft Gearbox Removal

09/06/2017 9:14 PM

I have a hollow shaft gearbox which has seized onto a shaft, due to liquid animal waste getting in between the shaft and gearbox.

The 90mm driven shaft is at 45o with the gearbox retained on the shaft with a shrink disc. We cannot budge the gearbox and it has been suggested to push the gearbox onto the shaft to break the rust and then remove the gearbox with pullers. (We have a suitable base to push against)Is this the right way to do this or is there a better way?

Don't want to have to dismantle or break the gearbox if possible.

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#1

Re: Hollow Shaft Gearbox removal

09/06/2017 10:41 PM

Cool the shaft with an ice pack for an hour and then heat the shrink disc with a torch.

Ice will reduce the OD of the shaft and heat will increase the ID of the disc.

I have done this before, it works!

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#4
In reply to #1

Re: Hollow Shaft Gearbox removal

09/07/2017 9:04 AM

Agreed. I used the same trick to replace the king pins in an old I.H. truck once. Put the king pins in the freezer overnight, then mildly heated the socket - worked like a charm!

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#6
In reply to #1

Re: Hollow Shaft Gearbox removal

09/07/2017 12:05 PM

A thermos of LN2 works so much faster.

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#7
In reply to #6

Re: Hollow Shaft Gearbox removal

09/07/2017 12:14 PM

Yes, that way, when it doesn't come off, you can slap it with a rubber mallet, and it comes off in a million pieces?

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#8
In reply to #7

Re: Hollow Shaft Gearbox removal

09/07/2017 12:30 PM

The squeal of cryogenic liquid cooling of metal will also draw the neighbors out.

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#9
In reply to #8

Re: Hollow Shaft Gearbox removal

09/07/2017 12:42 PM

Yes, there can be an advantage in doing so, or not. Good idea, for sure.

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#10
In reply to #6

Re: Hollow Shaft Gearbox removal

09/07/2017 1:30 PM

I had one in the fridge, but all the LN2 has runnoft*. You'd have to be a fan of O Brother, Where Art Thou to understand that "runnoft". The Coen brothers are great!

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#11
In reply to #10

Re: Hollow Shaft Gearbox removal

09/07/2017 1:39 PM

I thought the word was "runtawf", actually, in Alabama that would be preceded by the adverb "dungone", as in "dungone and runtawf".

Yes, that was a great film. A true reflection of life in former, simpler times, when a man could end up in a whole lot of trouble just for being there at the right time.

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#13
In reply to #11

Re: Hollow Shaft Gearbox removal

09/07/2017 3:15 PM

What was that brand of hair wax George Clooney insisted on using?

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#14
In reply to #13

Re: Hollow Shaft Gearbox removal

09/07/2017 3:22 PM

From his encounter at the general store, where everything was "two weeks away" "Well, I don't want Fop, god***mit. I'm a Dapper Dan man."

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#15
In reply to #13

Re: Hollow Shaft Gearbox removal

09/07/2017 3:27 PM

I'm a Dapper Dan man, not of that FOP stuff for me!

I is bona fide. The following clip 'splains what bona fide is, but there are a couple of choice words that did not get bleepted.

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#12
In reply to #6

Re: Hollow Shaft Gearbox removal

09/07/2017 2:49 PM

Canned air works pretty well for that sort of work. Not as cold and LN2 but when the can is turned upside down the liquid can be accurately sprayed into cracks or holes with the blower straw.

Same with liquid propane for bigger freezing jobs too.

I've done it a number of times.

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#2

Re: Hollow Shaft Gearbox removal

09/07/2017 3:44 AM

I agree with Lyn. I had a bearing which would not fit onto the shaft it was designed for, was supposed to be a snug push fit. My boss chucked the shaft into the freezer in the tearoom and an hour later we tried and it slipped on no problem. Didn't even need to heat the bearing.

Not being able to see your setup I can't tell how difficult it is to apply heat and chill parts down but it work!

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#3

Re: Hollow Shaft Gearbox removal

09/07/2017 4:01 AM

Pretty-much a standard way of freeing-off large-ish nuts and bolts (7/8"-1" BSW) that have become rusted together while in store is to heat them up to a dull red heat, then lob them into a bucket of water.

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#5

Re: Hollow Shaft Gearbox Removal

09/07/2017 9:49 AM

As suggested, differential cooling followed by heating the outer ring.

But first, try using some of the various penetrating oils, followed by high pressure water jet (pressure washer if possible). You may loosen up the deposits just enough.

I would not get too wild with attempting to push the gearbox further onto the shaft.

Any possibility of sending the forum a picture of this setup?

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#16
In reply to #5

Re: Hollow Shaft Gearbox Removal

09/10/2017 5:56 PM

I will get a pic and post it, never done that before, so should be interesting.

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