My Zilltertalbahn No. 2 (Model 2071D; our name for it is "Gustav.") stopped picking up power on all its wheels. I discovered this issue after I thought I fixed a problem with the tabs on the motor being bent out of shape. That would've been too easy...
At any rate, if you take an ohmmeter along the wheels on one side or the other, it shows connectivity only across certain wheels. I polished the wheels...Nope. Tonight, I disassembled the locomotive thinking that the common brass bus I presume serves to take power from the contact springs to the motor was corroded and / or bent. Then I got stuck. There seems to be no way to separate the chassis into a left and right side to get at it.
I did, however, note a few things as I broke "Gustav" down:
- The contact springs themselves are pretty corroded; one was even broken.
- The brass wells that hold the springs and presumable in turn contact an internal bus are pretty clean.
- Taking the ohmmeter across those brass wells showed the same mixed results as taking it across the wheels. Again, this seems to point to an issue with something internal to the chassis.
In the event that history may help in troubleshooting, "Gustav" dates from the 1980-s, was used for about 5-6 years, then went into its original box until a few years ago where it saw some light, indoor service for a year or so before joining its old "colleagues" out here in Hawaii. Until a few weeks ago, it had been one of our best pullers on the Triple O.
As ever, I appreciate any tips on how to proceed, even if proceeding may mean sending "Gustav" off to a professional repair facility.
With a belated wish for a Happy Thanksgiving,
Thanks and Aloha!