[Milsurplus] Lubing the ARC-2 Dynamotor Bearings

[WA5CAB--- via Milsurplus]

Terry,

The warning "Do not pack bearings" means not to put so much grease in there 
that the cover when replaced squeezes it out the armature side.  Because it 
will be slung all over the place, including onto the commutator.  It does 
NOT mean that if the bearings are newer, don't lube them.  I would not use 
brake cleaner unless you remove the armature from the dynamotor.  

If you do remove the armature from the dynamotor, , do not remove the 
bearings from it unless you have new replacements.  The reason is that the only 
way to remove them is to pull on the outer race because until you get them 
partially pulled, you cannot get any kind of puller on the inner race.  The 
bearings are a press fit on the armature.  Removing them by pulling on the 
outer race will damage them because of something known as "Brinelling".  
Installing them by pushing on the outer race also destroys them.

At 70 deg. F, ANDOC C has about the consistency of peanut butter.  Although 
not quite as sticky and stringy.

In a message dated 11/08/2014 21:13:26 PM Central Standard Time, 
milsurplus at mailman.qth.net writes: 
> I just picked my second ARC-2 transceiver and this time I was rewarded 
> with a
> Dynamotor, the unit is very clean, but the bearing grease needs to be 
> replaced.  
> Below is the instructions found inside one of the end covers.  Am I 
> correct to
> assume the “Do not pack bearings” refers to bearings that are a few years 
> newer 
> and don’t need a complete flushing?   Also can these bearings be clean 
> with brake 
> cleaner (spray) and forced lubed in place?
> 
> Thanks,
> Terry
> W7CJ    
> 
> INSTRCTIONS FOR LUBRICATING DYNAMOTOR  
> This machine is shipped from the factory lubricated with a
> sufficient amount of grease for approximately 1000 hours of
> operation or six mos. of ordinary service.  To lubricate 
> remove bearing covers and apply enough Andok “C” grease 
> as mtg. by Standard Oil Co. of N. J. to cover the bearings.  
> Do not pack bearings.
> KEEP GREASE OFF COMMUTATORS

Robert & Susan Downs - Houston
wa5cab dot com (Web Store)
MVPA 9480