[ARC5] Dynamotor Grease

[Michael Hanz]

The SHC 100 will do fine for a *_lon_g* time, Mark.  But lately I have 
been using another Mobil synthetic that has a more "spage age" 
thickener.  If you want to use the latest and greatest, get a tube of 
Mobil SHC Polyrex 102 EM (EM means electric motor) and try it.  A tube 
will set you back a little bit more than the SHC 100, but for those 
constantly pursuing perfection, you may appreciate the latest polyurea 
thickener technology used in its formulation.  There is much less 
separation of the synthetic lube in the tube from the thickener than 
with SHC-100, though in a tiny bearing it isn't really an issue.

73 Mike KC4TOS

On 8/20/2025 8:44 PM, Mark K3MSB wrote:
> From other threads I mentioned that I was looking at Dynamotor Whine 
> on my DF Setup.   I swapped dynamotors and the noise with another was 
> greatly reduced.
>
> Reading the manual, I tested the dynamotor armature sections for 
> shorts / opens, and it's fine.
>
> I know I serviced this receiver dynamotor about 10 years ago, which 
> may seem like a long time but I don't use the receiver dynamotors in 
> the shack that often, in fact very little  I was surprised to see a 
> lot of the grease gone so I want to add some more... and yes I know 
> not to pack the bearings with too much grease.
>
> I've been using Mobile SHC 100 Synthetic Grease.
>
> What are you using to grease dynamotor bearings?
>
> 73 Mark K3MSB
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