[ARC5] BC-348 DYNAMOTOR

[WA5CAB at cs.com]

John,

I think you may have replied to a couple of the posts off-list but I still 
don't know whether it's the brush caps or the brushes that are stuck.  Both 
happen.  If the former, another possibility to add to Mike's holder list is a 
scissors type tube puller with the plastic covering over the curved tips.  Hold 
the tube puller in one hand (left for most people) and grab the cap with it.  
Grab the outside of the puller tips with pliers and loosen the cap.

If the brushes are stuck in the holders, don't pull very hard on the outer 
end of the spring or you will pull the wire out of the brush.  If pulling on the 
spring doesn't remove the brush, you can try pushing on top and bottom sides 
with a flat wood stick but I've never had much success with that.  Unless you 
have new brushes or are sure the ones there are nearly new length, I wouldn't 
recommend trying to get something sharp like a knife blade between the brush 
end and the commutator.  

Assuming you can rotate the armature (brushes aren't stuck to commutators), 
remove the leads from the brush holder terminals.  Remove the two screws or 
studs holding the cast aluminum bearing and brush holder carriers to the field 
coil assembly (steel cylinder).  Pull one carrier away from the field housing 
far enough that you can move the carrier from side to side.  Then grasp the 
bearing end and wobble or rock the carrier back and forth slightly in the plane of 
the brushes while pulling it away from the rest of the dynamotor.  Once one 
is clear of the dynamotor, pull the armature out the open end.  You can then 
get at the commutator end of the brushes with the wood stick and push them into 
the brush holder slightly.  At that point, you should be able to remove the 
brush by pulling gently on the spring.  If it is still stuck, cut a piece of the 
stick short enough to fit between the two brushes.  Grab it with long nose 
pliers and use it to push the brush out.  

In a message dated 1/23/2008 5:18:23 PM Central Standard Time, 
wb9nwn at sbcglobal.net writes: 
> I AM TRYING TO CHANGE THE BRUSHES IN MY DM-28
> DYNAMOTOR. I CANNOT REMOVE THE OLD BRUSHES! ANY HELP
> FROM ANYONE? TNX: JOHN

Robert Downs - Houston
<http://www.wa5cab.com> (Web Store)
MVPA 9480
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