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Tractor Talk Discussion Forum

Worn press fit

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Hendrik

11-16-2004 05:40:31




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Have a question about the hydraulic pump of my 1948 Farmall Super A. The gearwheel (16 teeth) on the outside of the pump which is driven by the camshaft gear wheel, should have a press fit on the pump shaft (1/2 inch dia.). It also has a halfmoon key and is kept in place by a nut which srews on to the pump shaft. The press fit, however, is worn from running with the nut loose. The difference in diameter between shaft and bore is approx. 0.01 inch.
Any ideas on how to fix this? Any and all help appreciated. Hendrik

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Leland

11-16-2004 17:48:46




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 Re: Worn press fit in reply to Hendrik, 11-16-2004 05:40:31  
Ask Allen in NE he can be of great help here he has been fighting a red tractor for a while,I bet he even bleeds red.



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Joe (Wa)

11-16-2004 17:47:14




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 Re: Worn press fit in reply to Hendrik, 11-16-2004 05:40:31  
0.010" is quite a lot of metal. Speedy-Sleeves work great on shafts but the gear bore should not be out of round. Sleeves come in assorted thicknesses (is that a word?)and the gear bore can usually be cleaned up.

Joe



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Bill WI

11-16-2004 08:54:38




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 Re: Worn press fit in reply to Hendrik, 11-16-2004 05:40:31  
Is it .01 or .001? .01 is 1/10" and would likely involve an egg shaped hole with a key needing a sleeve or shaft buildup. .001 might work with Loctite or an epoxy fix. Just remember to heat the area till the fix smokes or about 600 degrees if you have to remove it. Bill



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Alvin NE WI

11-16-2004 17:45:37




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 Re: Worn press fit in reply to Bill WI , 11-16-2004 08:54:38  
.01=.010 is ten thousands. your figure of 1/10 or in machineing figure== .100 inch or nearly 1/8 in." which is .120 if my calulations are remembered right.



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thurlow

11-16-2004 09:54:26




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 Re: Worn press fit in reply to Bill WI , 11-16-2004 08:54:38  
I'm really confused; 1/10??? 1/100??? 1/1000???



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Bob - MI

11-16-2004 08:09:48




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 Re: Worn press fit in reply to Hendrik, 11-16-2004 05:40:31  
The correct fix depends on what is worn. Often there is one part that is harder than the other and the softer one is the one that gets repaired. 0.010" is quite a bit for a rotating part to be off and i"m guessing that value is on the diameter of the part (ID to OD). If it"s the gear that"s large I would consider slightly reaming it out to straighten the bore out and allow it the best contact on the shaft. You may need to see a machine shop for this. When opened up, take the difference in ID/OD and divide that by 2. This will be the size shim or sleeve that you will need. Wrap it around the shaft and give a gap for the key. Locktite is a good idea to keep it from wobbling off again.

If the shaft is worn it may be a different story trying to get it built back up but the goal is the same, get it straight again and achieve good contact. You may need to get a new shaft or your machine shop may be able to flame spray stock back on and re-machine the end. Good luck

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Rod (NH)

11-16-2004 07:41:18




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 Re: Worn press fit in reply to Hendrik, 11-16-2004 05:40:31  
Hi Hendrik,

I'd try some Loctite Retaining Compound #620, available at most good auto repair stores.

third party image Rod

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Willy-N

11-16-2004 07:02:50




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 Re: Worn press fit in reply to Hendrik, 11-16-2004 05:40:31  
You could try a peice of .01 Steel Shim Stock to take up the gap. Worth a try to save it. Mark H.



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Jerry Cent. Mi.

11-16-2004 11:17:49




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 Re: Worn press fit in reply to Willy-N, 11-16-2004 07:02:50  
If you can get the shaft in a lathe and its soft it might be possible to knurl it and turn it back to spec.



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Bob/Ont

11-16-2004 19:06:12




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 Re: Worn press fit in reply to Jerry Cent. Mi., 11-16-2004 11:17:49  
Just knurl it and press it together.
Later Bob



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Joe (Wa)

11-16-2004 20:23:48




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 Re: Worn press fit in reply to Bob/Ont, 11-16-2004 19:06:12  
0.001" maybe, 0.010" never happen. joe



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