[Milsurplus] Dynamotor Lubrication

[Bruce Gentry]

Bruce Gentry wrote:
> Ken Kinderman wrote:
>> Hello everyone,
>>
>> Finally getting around to collecting all my DM-32's,DY-8's etc. to 
>> check the
>> brushes and lube the bearings.
>>
>>
>> Opening the bearing cap at the end of the shafts reveals a kind of 
>> shield
>> over the actual balls themselves. I can pick out the old grease with a
>> toothpick, but can't get between the balls.
>>
>> Question: is this the limit of the access to the bearing? Seems like 
>> there
>> could be a lot of crud on the inner side of the bearing that I could be
>> missing.
>>
>> I am flushing the bearing carefully with mineral spirits while 
>> keeping the
>> dynamotor shaft horizonatal so as not to let the dilute crud fall 
>> into the
>> commutator.
>>
>> Is this the best that can be done? Or is there a secret to getting 
>> deeper?
>>
>> Using Mobil SHC-100.
>>
>> Thanks,
>>
>> Ken
>> W2EWL
>> ______________________________________________________________
>> Milsurplus mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/milsurplus
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Milsurplus at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>>   
> I have had excellent results by squirting a bit of synthetic engine 
> oil or automatic transmission fluid into the hardened grease to free 
> every thing up. Once the old grease is pasty once again, start the 
> dynamotor up for a minute or so to get the old stuff liquefied. Then 
> use electric motor cleaner available at NAPA and other auto supply 
> stores to flush the bearings out. Don't worry about some of it getting 
> on the commutator, the cleaner is intended for cleaning commutators. 
> Don't run it under power while flushing, the bearings won't be 
> lubricated enough at running speed. It's fine to spin it by hand all 
> as long as there is no binding. Read the label on the cleaner, some 
> are flammable and must be used outdoors, even the non-flammable 
> formula  gives off plenty fumes.  I use a synthetic grease called 
> "Green Grease", sold by a company called 2 Guys Garage.  It's 
> expensive, but easy to get in single tubes.There are certainly others 
> that will do the job,  modern greases and oils are almost always far 
> better  than the originals.   I have been cleaning all sorts of motor 
> bearing of all sizes and speeds this way for years, and haven't had 
> any problems if the bearings were in good condition to begin with.
>  Bruce Gentry, KA2IVY
>