[TR] Update: Replacing wiper motor brushes

[Geo Hahn]

When I disassembled my TR3A wiper motor (to fix a broken red wire) I found
it had been running with only one brush.  The other side was just the brush
holder riding directly against the commutator.

How could this be?  Looking closer I find down in the bottom of the motor
housing an unused brush.  Apparently it fell out during assembly and the
motor had run fine w/o it for 40+ years.

I did install the brush and seem to recall one side had some ridges or
bumps - possibly what is meant by slots.  Given it had done well with no
brush I didn't stress over which way that one went in.


On Sat, Mar 1, 2014 at 7:41 AM, Jeff <fishplate at charter.net> wrote:

> On 3/1/2014 8:40 AM, Dave Connitt wrote:
>
>> I am thinking the slots go out towards the commutator..
>> 1. The old brush didn't have a "slotted" surface.
>> 2. I am thinking the "slotted" surface helps seat the brush to the
>> commutator??
>>
>
> I have seen a lot of brushes, but I've never seen one with slots. Still, I
> can't imagine they need a slotted surface to help them seat. Brushes are
> typically graphite or similar,a nd are thus very soft.  It won't take much
> to seat them.
>
> More likely the grooves/slots help it fit in the holder - there may be an
> application where the grooves are used to hold the brush vertical in the
> holder.  I'd see if it fits with the grooves to the side, and install them
> that way.  But I don't know for sure.  You could try it, and see if they
> seat correctly without needing a grooved surface to help.
>
> Note:  The supplied brush may be originally designed for a different
> application, and so the grooves are vestigial.
>
> As for the plastic, very resourceful.  I might look around for some
> slippery tough plastic like Delrin or Teflon to make the piece, but then I
> never throw anything away so I probably have some if I look long enough.
>
> Jeff Scarbrough
> Corrosion Acres, Ga.
>
>
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