You will need a wheel puller, period. These plastic-cased locomotives are not the easiest to service, and the case will crack if you try to remove the wheels any other way. You also need a press and proper wheel cups to reinstall the wheels. I know some will say you can do it without the proper tools, but once you break a case, you're finished.
See here for a view of the internals of the motor.
The motors are also a nightmare to reassemble all the internal parts properly and get everything lined up to put the case halves together.
You will need the proper tools and lots of patience to work on these Scout locos. When you have them, give it a go.
Larry
