18 years ago
I am getting back into the hobby after a long while, and have been
lurking here over the past year. I model HO scale trains and my
collection is from the 60's, 70's and 80's. I don't know what DCC is
yet (: Have settled down in a nice old house with a full, empty
basement. And I have a small temporary layout running, and look
forward to building and enjoying a larger one.
But I have my old locos and also several yard sale finds that I'm
working on. And my question is about those 12V DC motors.
Perhaps you may be able to help me identify specific problem symptons
with my loco motors. I hope to be able to contribute answers for
other's questions in this group.
Question One: I have a loco that does not run. All wheels and contacts
cleaned and bearings lubed with recomended lubricant from the local
hobby shop. Take the motor out, clean the brush and communtator
contacts. When it is connected to a power supply, it needs a little
manual spin to get it going. It starts with high amps and low voltage
on the meter, and slowly spins up to high speed with the meter voltage
rising to full volts and the amps drop to very low. And will run this
way at high speed for a long time without getting even a little warm.
But just touch the shaft slightly and the speed drops right down and
the amps go up and voltage drops. No power at all. Cannot run with the
loco mechanisim or a car load.
What is the typical symptom of this problem?
A 1960's AHM FM diesel with the motor mounted vertically and a
complicated gear arrangement. Clean and lubricate the mechanisim and
it runs noisily OK but after a short time the motor gets really hot!!
Same thing happens with the motor removed and no load. Unlike question
one, this motor spins up instantly and has plenty of power.
I had been told a long time ago when I last looked at this loco's
problem that motor magnets lose their magnatism over time and this
shows itself as the motors getting really hot, very quickly when
running. Is this true?
Thanks group, for all your help. Yes I do not intend to run my
railroad and locos with these old motors, but information about these
problems would be a great help in my understanding these wonderful old
engines. I have more than a few Varney, Penn Line and others' trains,
that I remember enjoying so much on my uncles' and grandfathers'
Thanks all for your help,