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Author Topic: One Truck Trolley Motor Brushes and Springs  (Read 4574 times)
DSE

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« on: January 09, 2013, 04:04:25 AM »

I like to get several sets of motor brushes and brush tension springs for the one truck electric Trolley motor.  A set of brush holders would also be nice to get in case of loss or damage to the ones I have.

I ran my Santa Claus Trolley for a couple of weeks at low speeds pulling a couple of coaches 3 to 4 hours a day.  It then started to not be able to run at full speed, required a push to get going sometimes and then got much worse with a track voltage meter showing the full on Bachmann throttle voltage normally 16 volts being pulled down to below 10 volts and the Trolley running at very slow speeds.  This normally indicates worn brushes that have worn too short for the tension springs to make good electrical connection with them against commutator contacts. 

I checked the motor and found it has snap in brush holders where the electrical connection are on the motor.  These brush holders pry out with the flat blade of a small jewelers screw driver.  I've also pulled them out with the tip of a blunt needle nose pliers.  The spring tension is caped with a folded over copper rounded tab.  I was able to first remove the spring by opening up the folded over tab, but there was no brush connected to it.  I then pried out the brush holder and pushed out what was left of the brush with the shaft of jewelers screw driver.  One brush measured 0.15" long a little over an 1/8".  There was also a lot of black dust that washed out from the motor from a spraying of WD40.  Both brush tension springs managed to get away.  The black dust may have been brush debris that was causing some mild shorting explaining the big voltage drops I was seeing.  Several  people in the Garden Railroad forum say with a similar Bachmann Trolley they only went one week before the motor burned out.  With a more robust power supply that didn't drop voltage under this mild dust shorting a lot more heat might develop causing the motor to melt and burn. 

These brushes seem to only be good for about 25 to 40 hours of run time and the heavy dusting causes electrical problems.  This may be a compromise for better electrical conduction and commutator wear, but harder long wearing brushes that don't dust so much would seem advantages.  That said my Z-guage Marklin F-units are only related at 25 hours run time for their brushes and they are a lot more difficult to change.

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dgtrrco

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« Reply #1 on: January 10, 2013, 08:04:05 PM »

DSE!! The best thing to do with those motor blocks is change them out to an aristo motor block. I have 2 trolleys that I have changed out and they run perfectly. The aristo block for the u25 or fa diesel fits right in the space as the bachmann motor block. With little or no cutting involved. The only drawback is that the ar blocks have small connectors on them that have to be removed and rewired to the underside of the trolley, which is very simple to do. second of all the wheels do not line up with the side frames of the trolley, but form a distance who can tell. Youll never need a set of springs, brushes, etc. Mine have been in operation for over a yr or more with no problems. Hope this helps. I got mine off Ebay for a fraction of the price of a new motor block. Hope this little bit of info helps. gene
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Loco Bill Canelos

Model railroading since 1947


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« Reply #2 on: January 10, 2013, 11:10:20 PM »

DSE,
Another point is that these trolleys were never designed to pull even one heavy coach much less two. The heavy load alone could cause very early failure of the brushes due to overheating.  Replacing the motor block as suggested by Gene would allow pulling a couple of cars if you like to. 

Bill

 
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Loco Bill,  Roundhouse Foreman
Colorado & Kansas Railway Missouri Western Railway
Semi Official Historian; Bachmann Large Scale
There are no dumb or stupid questions, just questions!
Gandy Dancer 1

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« Reply #3 on: January 11, 2013, 08:17:06 AM »

The Aristocraft Motor Block you refer to is, I believe, their #ART-29356.  From my research it has been discontinued but is available on EBay.  I just bought an Arisro center cab diesel from EBay for just that reason.

If I'm wrong about this please let me know.

Will
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Gandy Dancer 1

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« Reply #4 on: January 14, 2013, 08:54:07 AM »

Was hoping to get verification that either the Aristocraft short power block is really out of production or still available new and I missed it in my research - discounting availability through EBay & the like.

Anyone help out here?

Will
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Mike M

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« Reply #5 on: January 16, 2013, 07:14:20 PM »

I have also used USA NW-2 motor blocks
Mike
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