lotrI have a Bachmann 4-8-4 locomotive I bought used on eBay. It runs but
very rough, speeding up and slowing down, especially on curves. I have tried
to work with the contactors on the driver wheels, but haven't made much
improvement. I was tempted to open it up, but the disassembly looks complex
and I have no diagram for the re-assembly.
I was told that Bachmann will repair these free if mailed to them, does
anyone know if this is true? If not, are there any recommendations for
finding a repair shop or model diagrams, preferably in the Texas area?
There can be many reasons why a loco is having that problem and they aren't
all related to the electrical system. If you are using a cheap powerpack,
you may want to put a grain of wheat bulb across the track and see if it
brightens when the loco is slowing down. If so then you do have electrical
problems. If the light dims when the loco is slowing down then you have
mechanical problems as the motor is driving nicely but the load is higher
and thus the back-emf is low causing more current to be requested and thus
the lower track voltage. This technique works only with the reostat type
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Bachmann charges $10.00 for Diesels and $15.00 for service. Usually
they simply replace the unit with a new one. Send it to them with a
check for $15.00 and ask them to fix the locomotive. Their address is
1400 East Erie Ave, Phila, PA 19124.
Hope that helps
My wife bought a Bachman Harry Potter set at the Ames going out of
business sale. After she got it home, we discovered that the engine
had been dropped on its nose. After calling them, I shipped the engine
and a copy of the receipt to their Philadelphia address. Three weeks
later we got back a good as new engine. My total cost was packing and
shipping to the shop. But that was treated as a warranty repair. They
claim to charge for non-warranty service.
Check the drive axle. Bachmann used a split axle where each wheel and half axle
were press fit into a center gear/axle.
After time, these can slip a little and lead to the wheels getting out of
alignment (quarter). The wheels can usually be twisted in the axle a little to
bring them back to proper alignment with the other drivers. Just be careful,
too much of this will wear down the fit. If this happens, a little crazy glue
will hold it, just make sure it's right before you glue it.