Lionel NW2 Gear Replacement

I've seen those gears a lot worse & still running OK.  Check this thread for a quick puller solution.

You may find that the studs on the aluminum side frames are worn too. I don't have a good solution yet for repairing those.

Here is another thread on wheel pullers if you are interested in purchasing one: Wheel Pullers.

Thanks ADCX ROB and C W BURFLE! I decided to go with Frank Timko's solution, and will let you know how my adventures went!

With regard to wear on the studs, it's difficult to tell without having the gears off yet, but from what I can see, the studs appear to be ok, just the inside of the idler gears has really been wallowed out. When I rotate the drive gear by hand, I get a binding spot almost every time at exactly one revolution (of the drive wheels). A quick and small back and forth motion clears the binding, so there may be other wear issues I can't see yet - the gears seem to be clean enough, but the idler gears sure can get sideways in a hurry!