For many years I used Lubriplate grease on dynamotor bearings, but now use an industrial synthetic. The Mobil One grease is very good, and I have used Mobil One 0W-15 engine oil for small gears and bearings with excellent results for many years.

B. Gentry, KA2IVY

On 8/20/25 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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