[GreenKeys] Motor bearings (TTY bearings in general?)

[paul cembura]

 Hello AllI stock most of the bearings for all Teletype equipmentPaulMR RTTY
    On Thursday, January 25, 2024 at 09:55:33 AM PST, John, W9DDD <w9ddd at tapr.org> wrote:  
 
   
So I have one LMU3 (1/20 HP) motor with a noisy bearing.  Looking in the box of miscellaneous Teletype parts that have no P/N associated with them, I have some bearings of various size.  I have maybe 6-8 bearing that caught my attention, but turn out to have 10 mm ID.  Too big!  Then I found a couple of cans containing bearings.  One of them had the number 122201 written on the top.  On the side there is a FSN of 3110-00-540-4618.  That according to duck duck go, is a bearing with an 8 mm ID.  Sounds good for the task at hand.
 
Also on the side is "LUB W/MIL-L-7870A.  First search result "LUBRICATING OIL, GENERAL PURPOSE, LOW TEMPERATURE"  Not sure if the A suffix changes that. (interesting side note, I can buy MIL-PRF 7870 at shop.boeing.com)
 
 
 The most recent Teletype information is to use KTS103 grease.  I haven't found an exact reference to that, but there are a lot of others that end in -103 like YM-103.
 
 
Back to the 10 mm ID bearings, I'm trying to think of where they may have been used.  My first thought was 14/15 motors, but the shaft size of them is the same as 28 motors, so I think that makes it doubtful.  Maybe the main shaft on either the 15 or 28?  Also have some little ones I haven't measured yet.
 
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You said "tomorrow" yesterday.

The above comments or recommendations are SWAG. Use at your own risk.
John, W9DDD
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