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Author Topic: Atlas SD-7 Universals  (Read 1213 times)

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Mike Madonna

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Atlas SD-7 Universals
« on: May 05, 2019, 08:58:02 PM »
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Good evening all,

Was looking for insight regarding the above. The subject is a "2004" Atlas (China) SD-7. One universal has split and spins on the shaft. The other  was working. However, when I went to spin the second universal, it too spun on the shaft. Turns out, both have a split in them. Looking for input regarding a "fix" for this issue. There is a thread regarding this (in January of 2018), but it involves the Atlas Alco C628/630 which is a different set up. Thanks in advance!
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Mike
SOUTHERN PACIFIC Coast Division 1953
Santa Margarita Sub

peteski

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Re: Atlas SD-7 Universals
« Reply #1 on: May 05, 2019, 10:20:25 PM »
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Quote from: Mike Madonna on May 05, 2019, 08:58:02 PM
Good evening all,

Was looking for insight regarding the above. The subject is a "2004" Atlas (China) SD-7. One universal has split and spins on the shaft. The other  was working. However, when I went to spin the second universal, it too spun on the shaft. Turns out, both have a split in them. Looking for input regarding a "fix" for this issue. There is a thread regarding this (in January of 2018), but it involves the Atlas Alco C628/630 which is a different set up. Thanks in advance!

Are those the ones which look like donuts with 2 posts on the opposite sides?  Atlas should still sell replacements.
I fixed few of those for a friend. When I got the new parts from Atlas, before I installed them on the motor shaft I uses sandpaper to slightly reduce motor shaft's diameter at the end of the shaft, where the universal sits.  Did that until the universals slipped onto the shaft with not much pressure.  Then I made sure the shaft and universals were clean and grease free (cleaned them both with acetone), then I super-glued them to the shaft.  Since there is no more stress on them they should not split again.
« Last Edit: May 06, 2019, 08:58:14 PM by peteski »
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Steveruger45

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Re: Atlas SD-7 Universals
« Reply #2 on: May 06, 2019, 07:09:46 PM »
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https://shop.atlasrr.com/p-2160-n-c-628-630-male-universal-joint.aspx

Atlas have them for the c628/630 which is the same part I believe.  These also fit the intermountain sd40-2w of 2010 vintage btw. 
Here’s the parts diagram for the  Sd9.   Same part number for male universal.
http://download.atlasrr.com/pdf/PartsPDFs/NParts/NSD9Loco.pdf
« Last Edit: May 06, 2019, 07:56:21 PM by Steveruger45 »
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Steve

Steveruger45

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Re: Atlas SD-7 Universals
« Reply #3 on: May 07, 2019, 11:54:07 AM »
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I just did another look at atlas parts.
https://shop.atlasrr.com/c-852-pn102.aspx?pagenum=2
Hope it helps solve your issue.
« Last Edit: May 07, 2019, 11:57:15 AM by Steveruger45 »
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Steve

SD452XR

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Re: Atlas SD-7 Universals
« Reply #4 on: May 07, 2019, 06:37:06 PM »
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I place the new part on the shaft, then press it in with a wood chopstick. Works great.
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peteski

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Re: Atlas SD-7 Universals
« Reply #5 on: May 07, 2019, 09:19:43 PM »
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Quote from: SD452XR on May 07, 2019, 06:37:06 PM
I place the new part on the shaft, then press it in with a wood chopstick.

What does that do exactly? I have hard time picturing what you are doing and why.
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