Cleaned same . so i took it apart again saw one set of wheels in forward poistion going clock wise and 2nd set of wheels going opposite. So reversed front set placed on track without shell and truck holder. Would not work. At all i think it was because traction tirees were on one side. Stumped.
I just hate it when that happens! When the wheels spin with no movement on a dual motor diesel it means only one of the two motors is working. Since the two motors share a reverse unit that can be ruled out as the issue. It is almost always bad brush to commutator contact on the non-running motor. Less likely causes are a broken wire or broken connection at the motor. We hope it is not a motor winding failure, but that is rare.
Tom is right about one motor no working. I had that problem on a newer Lionel/Flyer PA diesel.
After the one traction tire spins, it gets a glaze on it, and I doubt it will ever work. I had one motor
not running because one of the windings off the coil was catching on the armature. I need to get
some new traction tires. I am sure Jeff Kane has them. Where many of us screw up, including me,
after working on an engine we don't put engine up on blocks to test it. Sure would save the traction tires.
Putting engine up on blocks works for diesels and steamers.
I doubt armature in backwards. Motor brushes would not align with commutator.
I have 4 sets of the Lionel/Flyer PAs. One is the open frame motors. The other 3 are can motors. They are much easier to work with.
Maybe someone messed with the wiring before you got them. I can not think of any other reason they are running in opposite direction. Try switching the 2 wires running to the coil.
LOL, not on both motors, just one of them. Is the reverse unit workng?
I have been runnig the diesels they can move also finding how much it can pull so far i have 2 955's 1 650 green new haven and one 662 silver dome they r on my outside track which do up on a incline. So far so good.