[GreenKeys] M15 Synchronous (AC) Motor Lubrication - Ball Oilers

[Daniel Jones]

I usually refer to this page.  It’s based on the scientific properties of the lubricants and gives you current alternatives based on those properties.  

http://homepage.cs.uiowa.edu/~jones/pdp8/UI-8/ks7470oil.shtml

Daniel

K6YIC 
http://K6YIC.com

> On Jan 29, 2021, at 06:42, Paul Birkel <pbirkel at gmail.com> wrote:
> 
> 
> All;
>  
> The motor on my M15 uses the “ball oiler” style of lubrication ports.  Technically they seem to be “70771 FITTING, PRESSURE”.
>  
> Should I just depress them with an appropriately tipped tool and then try to drip a few drops of either light machine oil or SAE 5W synthetic motor oil (that I’ve seen recommended here in the past) around the depressed ball?
>  
> I realize (from long ago mechanics shop) that there must be a special grease gun whose nozzle is pressed over these ports to inject grease, but I certainly don’t have one.  The armature appears to be free turning (haven’t yet applied power) so it’s not clear that I actually _need_ to lubricate the motor at the moment.  Still, one wonders!
>  
> In TM11-2215 (tm11-2215-teletypewriter-tt5-model-15-20pct-of600dpi-main.pdf) Section II starting on page 69 covers the topic of lubrication.  At the bottom of page 71 in the table it states “Apply grease with gun or 4 or 5 drops in each.” with lubricant “KS-7471 or KS-7470”.  The former is a grease and the latter is “Oil lubricating, Teletype Part No. 88970.*” with the footnote indicating that at “high temperatures” SAE 10 engine oil may be substituted.
>  
> Is KS-7470 (Teletype Part No. 88970) substitutable by light machine (e.g., sewing machine) oil?  Unless either KS-7471 grease or OE 10 engine oil is specified, KS-7470 seems to be the go-to lubricant for the M15.  I’m thinking that light machine oil is appropriate in this application.
>  
> What method are folks using lubricate motors equipped with this style of lubrication port?  What lubricant?
>  
> Thank you for your advice,
> paul
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