Disassembly of EMD GP30

[MacedonBill]

Specifically, I need to remove the wheels to re-gauge them.  Not wanting to break anything, how is this done?

[Buford2025]

I have two older but new out of box Spectrum GP30 locos. The light on both will come on but locos will not move. All other GP30 locos operate fine. Motors are good. It could be a short in the frame but I just don't know. It the kind with the pickup on both sides of the trucks that rub the metal frame.

Any ideas?