[Milsurplus] Lubing the ARC-2 Dynamotor Bearings

[Mike Hanz]

In addition to Robert's excellent advice, there are a few more 
considerations about cleaning and repacking the bearings at 
http://aafradio.org/docs/Dynamotors.html - about half way down the web 
page would probably be of the greatest interest.

  - Mike  KC4TOS

On 11/9/2014 12:04 AM, WA5CAB--- via Milsurplus wrote:
> 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