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In lugnet.trains, David VinZant wrote:
> It looks like the outer most diamater of the wheel was rubbing on the frame.
That's it in a nutshell. I bought some SF carriages and Super Chief and after
running them for only a short amount of time it slowed right down.
The Motor was cutting out due to the load, from the weight of these heavier
carriages. Not the pulling weight, but the weight of the carriage was pushing
the wheels into the plastic frame that holds the axle.
I have other very old black wheel sets that jammed up the same way. I suspect
that the grey ones failed quicker due to the weight.
But all is not lost, I bought some brass chubing (3mm I think) and cut lots of
lengths about 10mm long. Pop the wheel off the axle and slip two of these brass
bushes onto the axle. Wheel back on and clip the axle back in place.
No modification needed to any plastic.
The extra circumference of the brass keeps the axle from seating too low, so it
will not rub on the frame. I did this to all my axles and everything has been
perfect since. No wear, no friction, and no lubrication needed.
Sometimes the spread of the wheels has to be adjusted. The best test is to roll
them over a cross track. If they run through there whichout catching then the
wheel spread is right.
I checked all my black wheel sets (some are 14+ years old) and most of them had
signs of wear on the frame. The heavier the carriage the more wear.
So I would conclude that it wasn't a poor batch in manufacturing but just a poor
design.
I have invested quite a bit in this Lego train hobby so a few dollars for the
brass was nothing.
Hope this helps.
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